CCS C Compiler Manual

CCS C Compiler Manual
CCS C Compiler Manual
PCB / PCM / PCH
March 2015
ALL RIGHTS RESERVED.
Copyright Custom Computer Services, Inc. 2015
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CCSC_March 2015-1
Table of Contents
Overview ........................................................................................................................................................................1
C Compiler..................................................................................................................................................................1
PCB, PCM and PCH Overview ...................................................................................................................................1
Installation ..................................................................................................................................................................1
Technical Support....................................................................................................................................................... 2
Directories ..................................................................................................................................................................2
File Formats................................................................................................................................................................ 3
Invoking the Command Line Compiler ........................................................................................................................ 3
PCW Overview ........................................................................................................................................................... 6
Menu ..........................................................................................................................................................................7
Editor Tabs .................................................................................................................................................................7
Slide Out Windows .....................................................................................................................................................7
Editor ..........................................................................................................................................................................8
Debugging Windows ...................................................................................................................................................8
Status Bar ...................................................................................................................................................................9
Output Messages ....................................................................................................................................................... 9
Program Syntax ........................................................................................................................................................... 10
Overall Structure....................................................................................................................................................... 10
Comment .................................................................................................................................................................. 10
Trigraph Sequences ................................................................................................................................................. 11
Multiple Project Files ................................................................................................................................................ 11
Multiple Compilation Units ........................................................................................................................................ 12
Full Example Program .............................................................................................................................................. 12
Statements ................................................................................................................................................................... 14
Statements ............................................................................................................................................................... 14
if................................................................................................................................................................................ 14
while ......................................................................................................................................................................... 15
do-while .................................................................................................................................................................... 15
for ............................................................................................................................................................................. 16
switch ....................................................................................................................................................................... 16
return ........................................................................................................................................................................ 17
goto .......................................................................................................................................................................... 17
label .......................................................................................................................................................................... 17
break ........................................................................................................................................................................ 18
continue .................................................................................................................................................................... 18
expr .......................................................................................................................................................................... 18
; ................................................................................................................................................................................ 18
stmt........................................................................................................................................................................... 19
Expressions ................................................................................................................................................................. 20
Constants ................................................................................................................................................................. 20
Identifiers .................................................................................................................................................................. 21
Operators.................................................................................................................................................................. 21
Operator Precedence ............................................................................................................................................... 22
Data Definitions ............................................................................................................................................................ 24
Data Definitions ........................................................................................................................................................ 24
Type Specifiers ......................................................................................................................................................... 24
Type Qualifiers ......................................................................................................................................................... 25
Enumerated Types ................................................................................................................................................... 26
Structures and Unions .............................................................................................................................................. 26
typedef ...................................................................................................................................................................... 27
Non-RAM Data Definitions ....................................................................................................................................... 28
Using Program Memory for Data .............................................................................................................................. 29
Named Registers ...................................................................................................................................................... 31
Function Definition ....................................................................................................................................................... 32
Function Definition .................................................................................................................................................... 32
Overloaded Functions .............................................................................................................................................. 32
Reference Parameters ............................................................................................................................................. 33
Default Parameters................................................................................................................................................... 33
Variable Argument Lists ........................................................................................................................................... 34
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Table of Contents
Functional Overview..................................................................................................................................................... 35
I2C ............................................................................................................................................................................ 35
ADC .......................................................................................................................................................................... 35
Analog Comparator .................................................................................................................................................. 36
CAN Bus ................................................................................................................................................................... 37
CCP .......................................................................................................................................................................... 39
Code Profile .............................................................................................................................................................. 39
Configuration Memory .............................................................................................................................................. 40
DAC .......................................................................................................................................................................... 41
Data Eeprom ............................................................................................................................................................ 42
Data Signal Modulator .............................................................................................................................................. 42
External Memory ...................................................................................................................................................... 43
General Purpose I/O................................................................................................................................................. 43
Internal LCD ............................................................................................................................................................. 44
Internal Oscillator...................................................................................................................................................... 45
Interrupts .................................................................................................................................................................. 46
Low Voltage Detect .................................................................................................................................................. 47
PMP/EPMP............................................................................................................................................................... 47
Power PWM.............................................................................................................................................................. 48
Program Eeprom ...................................................................................................................................................... 49
PSP .......................................................................................................................................................................... 50
QEI ........................................................................................................................................................................... 51
RS232 I/O ................................................................................................................................................................. 52
RTOS ....................................................................................................................................................................... 53
SPI............................................................................................................................................................................ 55
Timer0 ...................................................................................................................................................................... 56
Timer1 ...................................................................................................................................................................... 56
Timer2 ...................................................................................................................................................................... 57
Timer3 ...................................................................................................................................................................... 58
Timer4 ...................................................................................................................................................................... 58
Timer5 ...................................................................................................................................................................... 58
TimerA ...................................................................................................................................................................... 58
TimerB ...................................................................................................................................................................... 59
USB .......................................................................................................................................................................... 60
Voltage Reference .................................................................................................................................................... 62
WDT or Watch Dog Timer ........................................................................................................................................ 63
interrupt_enabled() ................................................................................................................................................... 64
Stream I/O ................................................................................................................................................................ 64
PreProcessor ............................................................................................................................................................... 66
PRE-PROCESSOR DIRECTORY ............................................................................................................................ 66
__address__ ............................................................................................................................................................. 67
_attribute_x ............................................................................................................................................................... 67
#asm #endasm #asm asis ........................................................................................................................................ 68
#bit............................................................................................................................................................................ 70
__buildcount__ ......................................................................................................................................................... 70
#build ........................................................................................................................................................................ 70
#byte ......................................................................................................................................................................... 71
#case ........................................................................................................................................................................ 72
_date_ ...................................................................................................................................................................... 72
#define ...................................................................................................................................................................... 72
definedinc ................................................................................................................................................................. 73
#device ..................................................................................................................................................................... 74
_device_ ................................................................................................................................................................... 76
#if expr #else #elif #endif .......................................................................................................................................... 76
#error ........................................................................................................................................................................ 77
#export (options)....................................................................................................................................................... 77
__file__ ..................................................................................................................................................................... 78
__filename__ ............................................................................................................................................................ 78
#fill_rom .................................................................................................................................................................... 79
#fuses ....................................................................................................................................................................... 79
#hexcomment ........................................................................................................................................................... 80
#id............................................................................................................................................................................. 80
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#ignore_warnings ..................................................................................................................................................... 81
#import (options)....................................................................................................................................................... 81
#include .................................................................................................................................................................... 82
#inline ....................................................................................................................................................................... 83
#int_xxxx .................................................................................................................................................................. 83
#INT_DEFAULT ....................................................................................................................................................... 86
#int_global ................................................................................................................................................................ 86
#list ........................................................................................................................................................................... 87
#line .......................................................................................................................................................................... 87
#locate ...................................................................................................................................................................... 87
#module .................................................................................................................................................................... 88
#nolist ....................................................................................................................................................................... 88
#ocs .......................................................................................................................................................................... 89
#opt .......................................................................................................................................................................... 89
#org .......................................................................................................................................................................... 90
#pin_select ............................................................................................................................................................... 91
__pcb__ .................................................................................................................................................................... 92
__pcm__ ................................................................................................................................................................... 92
__pch__ .................................................................................................................................................................... 93
#pragma ................................................................................................................................................................... 93
#priority ..................................................................................................................................................................... 93
#profile ...................................................................................................................................................................... 94
#reserve ................................................................................................................................................................... 95
#rom ......................................................................................................................................................................... 95
#separate ................................................................................................................................................................. 96
#serialize .................................................................................................................................................................. 96
#task ......................................................................................................................................................................... 97
__time__ ................................................................................................................................................................... 98
#type ......................................................................................................................................................................... 98
#undef ...................................................................................................................................................................... 99
_unicode ................................................................................................................................................................. 100
#use capture ........................................................................................................................................................... 100
#use delay .............................................................................................................................................................. 101
#use dynamic_memory .......................................................................................................................................... 102
#use fast_io ............................................................................................................................................................ 102
#use fixed_io .......................................................................................................................................................... 103
#use i2c .................................................................................................................................................................. 103
#use profile()........................................................................................................................................................... 104
#use pwm ............................................................................................................................................................... 105
#use rs232 .............................................................................................................................................................. 106
#use rtos ................................................................................................................................................................. 108
#use spi .................................................................................................................................................................. 109
#use standard_io .................................................................................................................................................... 110
#use timer ............................................................................................................................................................... 111
#use touchpad ........................................................................................................................................................ 112
#warning ................................................................................................................................................................. 113
#word ...................................................................................................................................................................... 113
#zero_ram .............................................................................................................................................................. 114
Built-in Functions........................................................................................................................................................ 115
BUILT-IN FUNCTIONS ........................................................................................................................................... 115
abs( ) ...................................................................................................................................................................... 119
sin( ) cos( ) tan( ) asin( ) acos() atan() sinh() cosh() tanh() atan2() ......................................................................... 120
adc_done( ) ............................................................................................................................................................ 121
assert( ) .................................................................................................................................................................. 121
atoe ........................................................................................................................................................................ 122
atof( ) ...................................................................................................................................................................... 122
pin_select() ............................................................................................................................................................. 123
atoi( ) atol( ) atoi32( ) .............................................................................................................................................. 124
bit_clear( )............................................................................................................................................................... 124
bit_set( ) ................................................................................................................................................................. 125
bit_test( ) ................................................................................................................................................................ 125
brownout_enable( )................................................................................................................................................. 126
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Table of Contents
bsearch( ) ............................................................................................................................................................... 126
calloc( ) ................................................................................................................................................................... 127
ceil( ) ....................................................................................................................................................................... 127
clc1_setup_gate() clc2_setup_gate() clc3_setup_gate() clc4_setup_gate() ........................................................... 128
clc1_setup_input() clc2_setup_input() clc3_setup_input() clc4_setup_input() ........................................................ 129
clear_interrupt( ) ..................................................................................................................................................... 129
cog_status( ) ........................................................................................................................................................... 130
cog_restart( ) .......................................................................................................................................................... 130
crc_calc( ) ............................................................................................................................................................... 131
crc_calc8( ) ............................................................................................................................................................. 131
crc_calc16( ) ........................................................................................................................................................... 131
crc_init(mode) ......................................................................................................................................................... 131
cwg_status( ) .......................................................................................................................................................... 132
cwg_restart( ).......................................................................................................................................................... 132
dac_write( ) ............................................................................................................................................................. 133
delay_cycles( )........................................................................................................................................................ 133
delay_ms( ) ............................................................................................................................................................. 134
delay_us( ) .............................................................................................................................................................. 134
disable_interrupts( ) ................................................................................................................................................ 135
div( ) ldiv( ) .............................................................................................................................................................. 136
enable_interrupts( ) ................................................................................................................................................ 136
erase_eeprom( ) ..................................................................................................................................................... 137
exp( ) ...................................................................................................................................................................... 137
ext_int_edge( )........................................................................................................................................................ 138
fabs( ) ..................................................................................................................................................................... 138
getc( ) getch( ) getchar( ) fgetc( ) ............................................................................................................................ 139
gets( ) fgets( ) ......................................................................................................................................................... 139
floor( ) ..................................................................................................................................................................... 140
fmod( ) .................................................................................................................................................................... 140
printf( ) fprintf( ) ....................................................................................................................................................... 141
putc( ) putchar( ) fputc( ) ......................................................................................................................................... 142
puts( ) fputs( ) ......................................................................................................................................................... 143
free( ) ...................................................................................................................................................................... 143
frexp( ) .................................................................................................................................................................... 144
scanf( ) ................................................................................................................................................................... 144
printf( ) .................................................................................................................................................................... 144
get_capture( ) ......................................................................................................................................................... 146
get_capture_event() ............................................................................................................................................... 147
get_capture_time() ................................................................................................................................................. 147
get_capture32() ...................................................................................................................................................... 148
get_nco_accumulator( ) .......................................................................................................................................... 148
get_nco_inc_value( ) .............................................................................................................................................. 149
get_ticks( ) .............................................................................................................................................................. 149
get_timerA( ) ........................................................................................................................................................... 149
get_timerB( ) ........................................................................................................................................................... 150
get_timerx( ) ........................................................................................................................................................... 150
get_tris_x( )............................................................................................................................................................. 151
getenv( ) ................................................................................................................................................................. 151
goto_address( ) ...................................................................................................................................................... 155
high_speed_adc_done( ) ........................................................................................................................................ 155
i2c_init( ) ................................................................................................................................................................. 156
i2c_isr_state( ) ........................................................................................................................................................ 156
i2c_poll( ) ................................................................................................................................................................ 157
i2c_read( ) .............................................................................................................................................................. 158
i2c_slaveaddr( ) ...................................................................................................................................................... 158
i2c_speed( ) ............................................................................................................................................................ 159
i2c_start( )............................................................................................................................................................... 159
i2c_stop( ) ............................................................................................................................................................... 160
i2c_write( ) .............................................................................................................................................................. 160
input( ) .................................................................................................................................................................... 161
input_change_x( ) ................................................................................................................................................... 162
input_state( )........................................................................................................................................................... 162
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input_x( ) ................................................................................................................................................................ 163
interrupt_active( ).................................................................................................................................................... 163
isalnum(char) isalpha(char) .................................................................................................................................... 164
iscntrl(x) isdigit(char) .............................................................................................................................................. 164
isgraph(x) islower(char) isspace(char) isupper(char) isxdigit(char) isprint(x) ispunct(x) ......................................... 164
isamong( )............................................................................................................................................................... 165
itoa( ) ...................................................................................................................................................................... 165
jump_to_isr( ).......................................................................................................................................................... 166
kbhit( ) .................................................................................................................................................................... 166
label_address( ) ...................................................................................................................................................... 167
labs( ) ..................................................................................................................................................................... 167
lcd_contrast( ) ......................................................................................................................................................... 168
lcd_load( ) ............................................................................................................................................................... 168
lcd_symbol( ) .......................................................................................................................................................... 169
ldexp( ) ................................................................................................................................................................... 169
log( ) ....................................................................................................................................................................... 170
log10( ) ................................................................................................................................................................... 170
longjmp( )................................................................................................................................................................ 171
make8( ) ................................................................................................................................................................. 171
make16( ) ............................................................................................................................................................... 172
make32( ) ............................................................................................................................................................... 172
malloc( ) .................................................................................................................................................................. 173
memcpy( ) memmove( ) ......................................................................................................................................... 173
memset( ) ............................................................................................................................................................... 174
modf( ) .................................................................................................................................................................... 174
_mul( ) .................................................................................................................................................................... 175
nargs( ) ................................................................................................................................................................... 175
offsetof( ) offsetofbit( ) ............................................................................................................................................ 176
output_x( ) .............................................................................................................................................................. 177
output_bit( ) ............................................................................................................................................................ 177
output_drive( ) ........................................................................................................................................................ 178
output_float( ) ......................................................................................................................................................... 178
output_high( ) ......................................................................................................................................................... 179
output_low( ) ........................................................................................................................................................... 180
output_toggle( ) ...................................................................................................................................................... 180
perror( ) .................................................................................................................................................................. 181
port_x_pullups ( ) .................................................................................................................................................... 181
pow( ) pwr( ) ........................................................................................................................................................... 182
printf( ) fprintf( ) ....................................................................................................................................................... 182
profileout() .............................................................................................................................................................. 183
psp_output_full( ) psp_input_full( ) psp_overflow( ) ................................................................................................ 184
pwm_off()................................................................................................................................................................ 185
pwm_on()................................................................................................................................................................ 185
pwm_set_duty() ...................................................................................................................................................... 186
pwm_set_duty_percent .......................................................................................................................................... 186
pwm_set_frequency ............................................................................................................................................... 186
qei_get_count( )...................................................................................................................................................... 187
qei_set_count( ) ...................................................................................................................................................... 187
qei_status( ) ............................................................................................................................................................ 188
qsort( ) .................................................................................................................................................................... 188
rand( ) ..................................................................................................................................................................... 189
rcv_buffer_bytes( ).................................................................................................................................................. 189
rcv_buffer_full( )...................................................................................................................................................... 190
read_adc( ) ............................................................................................................................................................. 190
read_bank( ) ........................................................................................................................................................... 191
read_calibration( )................................................................................................................................................... 192
read_configuration_memory( )................................................................................................................................ 192
read_eeprom( ) ....................................................................................................................................................... 192
read_extended_ram( ) ............................................................................................................................................ 193
read_program_memory( ) ....................................................................................................................................... 193
read_external_memory( ) ....................................................................................................................................... 193
read_high_speed_adc( ) ......................................................................................................................................... 194
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Table of Contents
read_rom_memory( ) .............................................................................................................................................. 195
read_sd_adc( ) ....................................................................................................................................................... 196
realloc( ) ................................................................................................................................................................. 196
release_io()............................................................................................................................................................. 197
reset_cpu( ) ............................................................................................................................................................ 197
restart_cause( ) ...................................................................................................................................................... 198
restart_wdt( ) .......................................................................................................................................................... 198
rotate_left( ) ............................................................................................................................................................ 199
rotate_right( ) .......................................................................................................................................................... 199
rtc_alarm_read( ) .................................................................................................................................................... 200
rtc_alarm_write( ).................................................................................................................................................... 200
rtc_read( ) ............................................................................................................................................................... 201
rtc_write( )............................................................................................................................................................... 201
rtos_await( ) ............................................................................................................................................................ 202
rtos_disable( ) ......................................................................................................................................................... 202
rtos_enable( ) ......................................................................................................................................................... 203
rtos_msg_poll( ) ...................................................................................................................................................... 203
rtos_msg_read( ) .................................................................................................................................................... 203
rtos_msg_send( ).................................................................................................................................................... 204
rtos_overrun( ) ........................................................................................................................................................ 204
rtos_run( ) ............................................................................................................................................................... 205
rtos_signal( ) ........................................................................................................................................................... 205
rtos_stats( )............................................................................................................................................................. 206
rtos_terminate( ) ..................................................................................................................................................... 206
rtos_wait( ) .............................................................................................................................................................. 207
rtos_yield( ) ............................................................................................................................................................. 207
set_adc_channel( ) ................................................................................................................................................. 208
scanf( ) ................................................................................................................................................................... 208
printf( ) .................................................................................................................................................................... 208
set_cog_blanking( ) ................................................................................................................................................ 210
set_cog_dead_band( )............................................................................................................................................ 211
set_cog_phase( ) .................................................................................................................................................... 211
set_compare_time( )............................................................................................................................................... 212
set_nco_inc_value( ) .............................................................................................................................................. 212
set_power_pwm_override( ) ................................................................................................................................... 213
set_power_pwmx_duty( ) ....................................................................................................................................... 214
set_pullup( ) ............................................................................................................................................................ 214
set_pwm1_duty( ) set_pwm2_duty( ) set_pwm3_duty( ) set_pwm4_duty( ) set_pwm5_duty( ) ............................. 215
set_rtcc( ) set_timer0( ) set_timer1( ) set_timer2( ) set_timer3( ) set_timer4( ) set_timer5( ) ........................... 216
set_ticks( ) .............................................................................................................................................................. 216
setup_sd_adc_calibration( ).................................................................................................................................... 217
set_sd_adc_channel( ) ........................................................................................................................................... 217
set_timerA( ) ........................................................................................................................................................... 218
set_timerB( ) ........................................................................................................................................................... 218
set_timerx( )............................................................................................................................................................ 219
set_rtcc( ) set_timer0( ) set_timer1( ) set_timer2( ) set_timer3( ) set_timer4( ) set_timer5( ) ........................... 219
set_tris_x( ) ............................................................................................................................................................. 220
set_uart_speed( ) ................................................................................................................................................... 220
setjmp( ) ................................................................................................................................................................. 221
setup_adc(mode).................................................................................................................................................... 221
setup_adc_ports( ).................................................................................................................................................. 222
setup_ccp1( ) setup_ccp2( ) setup_ccp3( ) setup_ccp4( ) setup_ccp5( ) setup_ccp6( ) ......................................... 222
setup_clc1() setup_clc2() setup_clc3() setup_clc4()............................................................................................... 224
setup_comparator( ) ............................................................................................................................................... 224
setup_counters( ).................................................................................................................................................... 225
setup_cog( )............................................................................................................................................................ 226
setup_crc( )............................................................................................................................................................. 227
setup_cwg( ) ........................................................................................................................................................... 227
setup_dac( )............................................................................................................................................................ 228
setup_external_memory( ) ...................................................................................................................................... 228
setup_high_speed_adc( ) ....................................................................................................................................... 229
setup_high_speed_adc_pair( ) ............................................................................................................................... 229
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setup_lcd( ) ............................................................................................................................................................. 230
setup_low_volt_detect( ) ......................................................................................................................................... 231
setup_nco( )............................................................................................................................................................ 231
setup_opamp1( ) setup_opamp2( ) ........................................................................................................................ 232
setup_oscillator( ) ................................................................................................................................................... 232
setup_pmp(option,address_mask) ......................................................................................................................... 233
setup_power_pwm( ) .............................................................................................................................................. 234
setup_power_pwm_pins( ) ..................................................................................................................................... 235
setup_psp(option,address_mask)........................................................................................................................... 235
setup_pwm1( ) setup_pwm2( ) setup_pwm3( ) setup_pwm4( ) .............................................................................. 236
setup_qei( )............................................................................................................................................................. 236
setup_rtc( ) ............................................................................................................................................................. 237
setup_rtc_alarm( ) .................................................................................................................................................. 237
setup_sd_adc( ) ...................................................................................................................................................... 238
setup_smtx( ) .......................................................................................................................................................... 239
setup_spi( ) setup_spi2( ) ....................................................................................................................................... 239
setup_timer_A( ) ..................................................................................................................................................... 240
setup_timer_B( ) ..................................................................................................................................................... 240
setup_timer_1( ) ..................................................................................................................................................... 241
setup_timer_2( ) ..................................................................................................................................................... 241
setup_timer_3( ) ..................................................................................................................................................... 242
setup_timer_4( ) ..................................................................................................................................................... 242
setup_timer_5( ) ..................................................................................................................................................... 243
setup_uart( ) ........................................................................................................................................................... 243
setup_vref( ) ........................................................................................................................................................... 244
setup_wdt( ) ............................................................................................................................................................ 244
setup_zdc( ) ............................................................................................................................................................ 245
shift_left( ) ............................................................................................................................................................... 245
shift_right( )............................................................................................................................................................. 246
sleep( ) ................................................................................................................................................................... 246
sleep_ulpwu( ) ........................................................................................................................................................ 247
smtx_read( ) ........................................................................................................................................................... 248
smtx_reset_timer( )................................................................................................................................................. 248
smtx_start( )............................................................................................................................................................ 249
smtx_status( ) ......................................................................................................................................................... 249
smtx_stop( ) ............................................................................................................................................................ 250
smtx_write( ) ........................................................................................................................................................... 250
smtx_update( )........................................................................................................................................................ 251
spi_data_is_in( ) spi_data_is_in2( ) ........................................................................................................................ 251
spi_init() .................................................................................................................................................................. 252
spi_prewrite(data); .................................................................................................................................................. 252
spi_read( ) spi_read2( ) ........................................................................................................................................ 253
spi_read_16() ......................................................................................................................................................... 253
spi_read2_16() ....................................................................................................................................................... 253
spi_read3_16() ....................................................................................................................................................... 253
spi_read4_16() ....................................................................................................................................................... 253
spi_speed ............................................................................................................................................................... 254
spi_write( ) spi_write2( ) ......................................................................................................................................... 254
spi_xfer( )................................................................................................................................................................ 255
SPII_XFER_IN() ..................................................................................................................................................... 255
sprintf( ) .................................................................................................................................................................. 256
sqrt( ) ...................................................................................................................................................................... 256
srand( ) ................................................................................................................................................................... 257
strcpy( ) strcopy( )................................................................................................................................................... 257
strtod( ) ................................................................................................................................................................... 258
strtok( ) ................................................................................................................................................................... 258
strtol( ) .................................................................................................................................................................... 259
strtoul( ) .................................................................................................................................................................. 260
swap( ) .................................................................................................................................................................... 261
tolower( ) toupper( ) ................................................................................................................................................ 261
touchpad_getc( )..................................................................................................................................................... 262
touchpad_hit( )........................................................................................................................................................ 262
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Table of Contents
touchpad_state( ).................................................................................................................................................... 263
tolower( ) toupper( ) ................................................................................................................................................ 263
tx_buffer_bytes()..................................................................................................................................................... 264
tx_buffer_full( )........................................................................................................................................................ 264
va_arg( ) ................................................................................................................................................................. 265
va_end( ) ................................................................................................................................................................ 265
va_start ................................................................................................................................................................... 266
write_bank( ) ........................................................................................................................................................... 267
write_configuration_memory( ) ............................................................................................................................... 267
write_eeprom( ) ...................................................................................................................................................... 268
write_external_memory( ) ....................................................................................................................................... 268
write_extended_ram( ) ............................................................................................................................................ 269
write_program_eeprom( ) ....................................................................................................................................... 269
write_program_memory( ) ...................................................................................................................................... 270
zdc_status( ) ........................................................................................................................................................... 271
Standard C Include Files ............................................................................................................................................ 272
errno.h .................................................................................................................................................................... 272
float.h ...................................................................................................................................................................... 272
limits.h .................................................................................................................................................................... 273
locale.h ................................................................................................................................................................... 273
setjmp.h .................................................................................................................................................................. 274
stddef.h ................................................................................................................................................................... 274
stdio.h ..................................................................................................................................................................... 274
stdlib.h .................................................................................................................................................................... 274
Error Messages .......................................................................................................................................................... 275
Compiler Error Messages ....................................................................................................................................... 275
Compiler Warning Messages ..................................................................................................................................... 282
Compiler Warning Messages.................................................................................................................................. 282
Common Questions & Answers ................................................................................................................................. 284
How are type conversions handled?....................................................................................................................... 284
How can a constant data table be placed in ROM? ................................................................................................ 285
How can I use two or more RS-232 ports on one PIC®? ....................................................................................... 285
How can the RB interrupt be used to detect a button press? ................................................................................. 286
How do I directly read/write to internal registers? ................................................................................................... 286
How do I do a printf to a string? .............................................................................................................................. 287
How do I get getc() to timeout after a specified time?............................................................................................. 287
How do I put a NOP at location 0 for the ICD? ....................................................................................................... 288
How do I wait only a specified time for a button press? .......................................................................................... 288
How do I write variables to EEPROM that are not a byte? ..................................................................................... 288
How does one map a variable to an I/O port? ........................................................................................................ 289
How does the compiler determine TRUE and FALSE on expressions? ................................................................. 290
How does the PIC® connect to a PC?.................................................................................................................... 290
How does the PIC® connect to an I2C device? ...................................................................................................... 290
How much time do math operations take? ............................................................................................................. 291
Instead of 800, the compiler calls 0. Why? ............................................................................................................. 291
Instead of A0, the compiler is using register 20. Why? .......................................................................................... 291
What can be done about an OUT OF RAM error? .................................................................................................. 292
What is an easy way for two or more PICs® to communicate? .............................................................................. 292
What is an easy way for two or more PICs® to communicate? .............................................................................. 292
What is the format of floating point numbers? ........................................................................................................ 293
Why does the .LST file look out of order? ............................................................................................................... 293
Why does the compiler show less RAM than there really is? ................................................................................. 294
Why does the compiler use the obsolete TRIS? ..................................................................................................... 294
Why is the RS-232 not working right? .................................................................................................................... 294
Example Programs..................................................................................................................................................... 297
EXAMPLE PROGRAMS ......................................................................................................................................... 297
Software License Agreement ..................................................................................................................................... 316
SOFTWARE LICENSE AGREEMENT ................................................................................................................... 316
ix
OVERVIEW
C Compiler
PCB, PCM and PCH Overview
Technical Support
Directories
File Formats
Invoking the Command Line Compiler
PCB, PCM and PCH Overview
The PCB, PCM, and PCH are separate compilers. PCB is for 12-bit opcodes, PCM is for 14-bit opcodes, and PCH is
for 16-bit opcode PIC® microcontrollers. Due to many similarities, all three compilers are covered in this reference
manual. Features and limitations that apply to only specific microcontrollers are indicated within. These compilers are
specifically designed to meet the unique needs of the PIC® microcontroller. This allows developers to quickly design
applications software in a more readable, high-level language.
IDE Compilers (PCW, PCWH and PCWHD) have the exclusive C Aware integrated development environment for
compiling, analyzing and debugging in real-time. Other features and integrated tools can be viewed here.
When compared to a more traditional C compiler, PCB, PCM, and PCH have some limitations. As an example of the
limitations, function recursion is not allowed. This is due to the fact that the PIC® has no stack to push variables onto,
and also because of the way the compilers optimize the code. The compilers can efficiently implement normal C
constructs, input/output operations, and bit twiddling operations. All normal C data types are supported along with
pointers to constant arrays, fixed point decimal, and arrays of bits.
Installation
Insert the CD ROM, select each of the programs you wish to install and follow the on-screen instructions.
If the CD does not auto start run the setup program in the root directory.
For help answering the version questions see the "Directories" Help topic.
Key Questions that may come up:
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Keep Settings- Unless you are having trouble select this
Link Compiler Extensions- If you select this the file extensions like .c will start
the compiler IDE when you double click on files with that extension. .hex files start
the CCSLOAD program. This selection can be change in the IDE.
Install MP LAB Plug In- If you plan to use MPLAB and you don't select this you
will need to download and manually install the Plug-In.
Install ICD2, ICD3...drivers-select if you use these microchip ICD units.
Delete Demo Files- Always a good idea
Install WIN8 APP- Allows you to start the IDE from the WIN8 Start Menu.
Technical Support
Compiler, software, and driver updates are available to download at:
http://www.ccsinfo.com/download
Compilers come with 30 or 60 days of download rights with the initial purchase. One year maintenance plans may be
purchased for access to updates as released.
The intent of new releases is to provide up-to-date support with greater ease of use and minimal, if any, transition
difficulty.
To ensure any problem that may occur is corrected quickly and diligently, it is recommended to send an email to:
[email protected] or use the Technical Support Wizard in PCW. Include the version of the compiler, an outline of
the problem and attach any files with the email request. CCS strives to answer technical support timely and
thoroughly.
Technical Support is available by phone during business hours for urgent needs or if email responses are not
adequate. Please call 262-522-6500 x32.
Directories
The compiler will search the following directories for Include files.

Directories listed on the command line

Directories specified in the .CCSPJT file

The same directory as the source.directories in the ccsc.ini file
By default, the compiler files are put in C:\Program Files\PICC and the example programs are in
\PICC\EXAMPLES. The include files are in PICC\drivers. The device header files are in
PICC\devices.
The compiler itself is a DLL file. The DLL files are in a DLL directory by default in \PICC\DLL.
It is sometimes helpful to maintain multiple compiler versions. For example, a project was tested with a specific
version, but newer projects use a newer version. When installing the compiler you are prompted for what version to
keep on the PC. IDE users can change versions using Help>about and clicking "other versions." Command Line
users use start>all programs>PIC-C>compiler version.
Two directories are used outside the PICC tree. Both can be reached with start>all programs>PIC-C.
2
Overview
1.) A project directory as a default location for your projects. By default put in "My
Documents." This is a good place for VISTA and up.
2.) User configuration settings and PCWH loaded files are kept in %APPDATA%\PICC
File Formats
.c
.h
.pjt
.ccspjt
.lst
.sym
.sta
.tre
This is the source file containing user C source code.
These are standard or custom header files used to define pins, register, register bits, functions and preprocessor directives.
This is the older pre- Version 5 project file which contains information related to the project.
This is the project file which contains information related to the project.
This is the listing file which shows each C source line and the associated assembly code generated for that line.
The elements in the .LST file may be selected in PCW under Options>Project>Output Files
CCS Basic
Standard assembly instructions
with Opcodes
Includes the HEX opcode for each instruction
Old Standard
Symbolic
Shows variable names instead of addresses
This is the symbol map which shows each register location and what program variables are stored in each location.
The statistics file shows the RAM, ROM, and STACK usage. It provides information on the source codes structural and textual
complexities using Halstead and McCabe metrics.
The tree file shows the call tree. It details each function and what functions it calls along with the ROM and RAM usage for
each function.
The compiler generates standard HEX files that are compatible with all programmers.
.hex
The compiler can output 8-bet hex, 16-bit hex, and binary files.
This is a binary containing machine code and debugging information.
.cof
The debug files may be output as Microchip .COD file for MPLAB 1-5, Advanced Transdata .MAP file, expanded .COD file for
CCS debugging or MPLAB 6 and up .xx .COF file. All file formats and extensions may be selected via Options File
Associations option in Windows IDE.
.cod
This is a binary file containing debug information.
The output of the Documentation Generator is exported in a Rich Text File format which can be viewed using the RTF editor or
.rtf
Wordpad.
.rvf
The Rich View Format is used by the RTF Editor within the IDE to view the Rich Text File.
.dgr
The .DGR file is the output of the flowchart maker.
.esym
These files are generated for the IDE users. The file contains Identifiers and Comment information. This data can be used for
.xsym
automatic documentation generation and for the IDE helpers.
.o
Relocatable object file
.osym This file is generated when the compiler is set to export a relocatable object file. This file is a .sym file for just the one unit.
.err
Compiler error file
.ccsload used to link Windows 8 apps to CCSLoad
.ccssiow used to link Windows 8 apps to Serial Port Monitor
Invoking the Command Line Compiler
The command line compiler is invoked with the following command:
CCSC
[options]
[cfilename]
Valid options:
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+FB
+FM
+FH
+Yx
Select PCB (12 bit)
Select PCM (14 bit)
Select PCH (PIC18XXX)
Optimization level x (0-9)
+FS
+ES
+T
+A
+EW
+EA
Select SXC (SX)
Standard error file
Create call tree (.TRE)
Create stats file (.STA)
Show warning messages
Show all error messages and all warnings
-D
+DS
+DM
+DC
+DF
+EO
-T
-A
-EW
-E
+EX
Do not create debug file
Standard .COD format debug file
.MAP format debug file
Expanded .COD format debug file
Enables the output of an COFF debug file.
Old error file format
Do not generate a tree file
Do not create stats file (.STA)
Suppress warnings (use with +EA)
Only show first error
Error/warning message format uses GCC's
"brief format" (compatible with GCC editor
environments)
The xxx in the following are optional. If included it sets the file extension:
+LNxxx
Normal list file
+O8xxx
8-bit Intel HEX output file
+LSxxx
MPASM format list file
+OWxxx
16-bit Intel HEX output file
+LOxxx
Old MPASM list file
+OBxxx
Binary output file
+LYxxx
Symbolic list file
-O
Do not create object file
-L
Do not create list file
+P
+Pxx
+PN
+PE
Keep compile status window up after compile
Keep status window up for xx seconds after compile
Keep status window up only if there are no errors
Keep status window up only if there are errors
+Z
+DF
I+="..."
Keep scratch files on disk after compile
COFF Debug file
Same as I="..." Except the path list is appended to the current list
I="..."
Set include directory search path, for example:
I="c:\picc\examples;c:\picc\myincludes"
If no I= appears on the command line the .PJT file will be used to supply the include file paths.
-P
+M
-M
+J
-J
+ICD
#xxx="yyy"
Close compile window after compile is complete
Generate a symbol file (.SYM)
Do not create symbol file
Create a project file (.PJT)
Do not create PJT file
Compile for use with an ICD
Set a global #define for id xxx with a value of yyy, example:
#debug="true"
+Gxxx="yyy"
+?
-?
Same as #xxx="yyy"
Brings up a help file
Same as +?
+STDOUT
+SETUP
sourceline=
Outputs errors to STDOUT (for use with third party editors)
Install CCSC into MPLAB (no compile is done)
Allows a source line to be injected at the start of the source file.
Example: CCSC +FM myfile.c sourceline=“#include <16F887.h>”
Show compiler version (no compile is done)
Show all valid devices in database (no compile is done)
+V
+Q
A / character may be used in place of a + character. The default options are as follows:
+FM +ES +J +DC +Y9 -T -A +M +LNlst +O8hex -P -Z
4
Overview
If @filename appears on the CCSC command line, command line options will be read from the specified
file. Parameters may appear on multiple lines in the file.
If the file CCSC.INI exists in the same directory as CCSC.EXE, then command line parameters are read from that file
before they are processed on the command line.
Examples:
CCSC +FM C:\PICSTUFF\TEST.C
CCSC +FM +P +T TEST.C
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PCW Overview
The PCW IDE provides the user an easy to use editor and environment for developing microcontroller
applications. The IDE comprises of many components, which are summarized below. For more
information and details, use the Help>PCW in the compiler..
Many of these windows can be re-arranged and docked into different positions.
6
Overview
Menu
All of the IDE's functions are on the main menu. The main menu is divided into
separate sections, click on a section title ('Edit', 'Search', etc) to change the
section. Double clicking on the section, or clicking on the chevron on the right,
will cause the menu to minimize and take less space.
Editor Tabs
All of the open files are listed here. The active file, which is the file currently
being edited, is given a different highlight than the other files. Clicking on the X
on the right closes the active file. Right clicking on a tab gives a menu of useful
actions for that file.
Slide Out Windows
'Files' shows all the active files in the current project. 'Projects' shows all the
recent projects worked on. 'Identifiers' shows all the variables, definitions,
prototypes and identifiers in your current project.
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Editor
The editor is the main work area of the IDE and the place where the user enters
and edits source code. Right clicking in this area gives a menu of useful actions
for the code being edited.
Debugging Windows
Debugger control is done in the
debugging windows. These
windows allow you set breakpoints,
single step, watch variables and
more.
8
Overview
Status Bar
The status bar gives the user helpful information like the cursor position, project
open and file being edited.
Output Messages
Output messages are displayed here. This includes messages from the compiler
during a build, messages from the programmer tool during programming or the
results from find and searching.
9
PROGRAM SYNTAX
Overall Structure
A program is made up of the following four elements in a file:
Comment
Pre-Processor Directive
Data Definition
Function Definition
Statements
Expressions
Every C program must contain a main function which is the starting point of the program execution. The program can
be split into multiple functions according to the their purpose and the functions could be called from main or the subfunctions. In a large project functions can also be placed in different C files or header files that can be included in the
main C file to group the related functions by their category. CCS C also requires to include the appropriate device file
using #include directive to include the device specific functionality. There are also some preprocessor directives like
#fuses to specify the fuses for the chip and #use delay to specify the clock speed. The functions contain the data
declarations,definitions,statements and expressions. The compiler also provides a large number of standard C
libraries as well as other device drivers that can be included and used in the programs. CCS also provides a large
number of built-in functions to access the various peripherals included in the PIC microcontroller.
Comment
Comments – Standard Comments
A comment may appear anywhere within a file except within a quoted string. Characters between /* and */ are
ignored. Characters after a // up to the end of the line are ignored.
Comments for Documentation Generator
The compiler recognizes comments in the source code based on certain markups. The compiler recognizes these
special types of comments that can be later exported for use in the documentation generator. The documentation
generator utility uses a user selectable template to export these comments and create a formatted output document
in Rich Text File Format. This utility is only available in the IDE version of the compiler. The source code markups are
as follows.
Global Comments
These are named comments that appear at the top of your source code. The comment names are case sensitive
and they must match the case used in the documentation template.
For example:
//*PURPOSE This program implements a Bootloader.
//*AUTHOR John Doe
A '//' followed by an * will tell the compiler that the keyword which follows it will be the named comment. The actual
comment that follows it will be exported as a paragraph to the documentation generator.
Multiple line comments can be specified by adding a : after the *, so the compiler will not concatenate the comments
that follow. For example:
/**:CHANGES
05/16/06 Added PWM loop
05/27.06 Fixed Flashing problem
*/
10
Program Syntax
Variable Comments
A variable comment is a comment that appears immediately after a variable declaration. For example:
int seconds; // Number of seconds since last entry
long day, // Current day of the month, /* Current Month */
long year;
// Year
Function Comments
A function comment is a comment that appears just before a function declaration. For example:
// The following function initializes outputs
void function_foo()
{
init_outputs();
}
Function Named Comments
The named comments can be used for functions in a similar manner to the Global Comments. These comments
appear before the function, and the names are exported as-is to the documentation generator.
For example:
//*PURPOSE This function displays data in BCD format
void display_BCD( byte n)
{
display_routine();
}
Trigraph Sequences
The compiler accepts three character sequences instead of some special characters not available on
all keyboards as follows:
Sequence
Same as
??=
#
??(
[
??/
\
??)
]
??'
^
??<
{
??!
|
??>
}
??~
Multiple Project Files
When there are multiple files in a project they can all be included using the #include in the main file or
the sub-files to use the automatic linker included in the compiler. All the header files, standard
libraries and driver files can be included using this method to automatically link them.
For example: if you have main.c, x.c, x.h, y.c,y.h and z.c and z.h files in your project, you can say in:
main.c
#include <device header file>
#include<x.c>
#include<y.c>
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#include <z.c>
x.c
y.c
z.c
#include <x.h>
#include <y.h>
#include <z.h>
In this example there are 8 files and one compilation unit. Main.c is the only file compiled.
Note that the #module directive can be used in any include file to limit the visibility of the symbol in that file.
To separately compile your files see the section "multiple compilation units".
Multiple Compilation Units
Multiple Compilation Units are only supported in the IDE compilers, PCW, PCWH, PCHWD and
PCDIDE. When using multiple compilation units, care must be given that pre-processor commands
that control the compilation are compatible across all units. It is recommended that directives such as
#FUSES, #USE and the device header file all put in an include file included by all units. When a unit is
compiled it will output a relocatable object file (*.o) and symbol file (*.osym).
There are several ways to accomplish this with the CCS C Compiler. All of these methods and
example projects are included in the MCU.zip in the examples directory of the compiler.
Full Example Program
Here is a sample program with explanation using CCS C to read adc samples over rs232:
//////////////////////////////////////////////
/////////
/// This program displays the min and max of
30,
///
/// comments that explains what the program
does, ///
/// and A/D samples over the RS-232
interface.
///
//////////////////////////////////////////////
/////////
#include <16F887.h>
preprocessor directive that
//
//
selects the chip PIC16F887
#fuses NOPROTECT
Code protection turned off
#use delay(crystal=20mhz)
preprocessor directive that
12
//
//
Program Syntax
//
specifies the clock type and speed
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) //
preprocessor directive that
//
includes the rs232 libraries
void main() {
main function
int i, value, min, max;
local variable declaration
printf("Sampling:");
printf function included in the
//
//
//
//
RS232 library
setup_port_a( ALL_ANALOG );
A/D setup functions- built-in
setup_adc( ADC_CLOCK_INTERNAL );
Internal clock always works
set_adc_channel( 0 );
Set channel to AN0
do {
forever statement
min=255;
max=0;
for(i=0; i<=30; ++i) {
Take 30 samples
delay_ms(100);
Wait for a tenth of a second
value = read_adc();
A/D read functions- built-in
if(value<min)
Find smallest sample
min=value;
if(value>max)
Find largest sample
max=value;
}
printf("\n\rMin: %2X Max:
%2X\n\r",min,max);
} while (TRUE);
}
//
//
//
// do
//
//
//
//
//
13
STATEMENTS
Statements
STATEMENT
if (expr) stmt; [else stmt;]
while (expr) stmt;
do stmt while (expr);
for (expr1;expr2;expr3) stmt;
switch (expr) {
case cexpr: stmt; //one or more case
[default:stmt]
... }
return [expr];
goto label;
label: stmt;
break;
continue;
expr;
;
{[stmt]}
Zero or more
declaration;
Example
if (x==25)
x=0;
else
x=x+1;
while (get_rtcc()!=0)
putc(‘n’);
do {
putc(c=getc());
} while (c!=0);
for (i=1;i<=10;++i)
printf(“%u\r\n”,i);
switch (cmd) {
case 0: printf(“cmd 0”);break;
case 1: printf(“cmd 1”);break;
default: printf(“bad
cmd”);break;
}
return (5);
goto loop;
loop: i++;
break;
continue;
i=1;
;
{a=1;
b=1;}
int i;
Note: Items in [ ] are optional
if
if-else
The if-else statement is used to make decisions.
The syntax is:
if (expr)
stmt-1;
[else
14
Statements
stmt-2;]
The expression is evaluated; if it is true stmt-1 is done. If it is false then stmt-2 is done.
else-if
This is used to make multi-way decisions.
The syntax is:
if (expr)
stmt;
[else if (expr)
stmt;]
...
[else
stmt;]
The expressions are evaluated in order; if any expression is true, the statement associated with it is executed and it
terminates the chain. If none of the conditions are satisfied the last else part is executed.
Example:
if (x==25)
x=1;
else
x=x+1;
Also See: Statements
while
While is used as a loop/iteration statement.
The syntax is:
while (expr)
statement
The expression is evaluated and the statement is executed until it becomes false in which case the execution
continues after the statement.
Example:
while (get_rtcc()!=0)
putc('n');
Also See: Statements
do-while
do-while: Differs from while and for loop in that the termination condition is
checked at the bottom of the loop rather than at the top and so the body of the
loop is always executed at least once. The syntax is:
do
statement
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CCSC_March 2015-1
while (expr);
The statement is executed; the expr is evaluated. If true, the same is repeated
and when it becomes false the loop terminates.
Also See: Statements , While
for
For is also used as a loop/iteration statement.
The syntax is:
for (expr1;expr2;expr3)
statement
The expressions are loop control statements. expr1 is the initialization, expr2 is
the termination check and expr3 is re-initialization. Any of them can be
omitted.
Example:
for (i=1;i<=10;++i)
printf("%u\r\n",i);
Also See: Statements
switch
Switch is also a special multi-way decision maker.
The syntax is
switch (expr) {
case const1: stmt sequence;
break;
...
[default:stmt]
}
This tests whether the expression matches one of the constant values and branches accordingly.
If none of the cases are satisfied the default case is executed. The break causes an immediate exit, otherwise control
falls through to the next case.
Example:
switch (cmd) {
case 0:printf("cmd 0");
break;
case 1:printf("cmd 1");
break;
default:printf("bad cmd");
break; }
Also See: Statements
16
Statements
return
return
A return statement allows an immediate exit from a switch or a loop or function and also returns a value.
The syntax is:
return(expr);
Example:
return (5);
Also See: Statements
goto
goto
The goto statement cause an unconditional branch to the label.
The syntax is:
goto label;
A label has the same form as a variable name, and is followed by a colon. The goto's are used
sparingly, if at all.
Example:
goto loop;
Also See: Statements
label
label
The label a goto jumps to.
The syntax is:
label: stmnt;
Example:
loop: i++;
Also See: Statements
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CCSC_March 2015-1
break
break.
The break statement is used to exit out of a control loop. It provides an early exit from while, for ,do and
switch.
The syntax is
break;
It causes the innermost enclosing loop (or switch) to be exited immediately.
Example:
break;
Also See: Statements
continue
The continue statement causes the next iteration of the enclosing loop(While, For, Do) to begin.
The syntax is:
continue;
It causes the test part to be executed immediately in case of do and while and the control passes the
re-initialization step in case of for.
Example:
continue;
Also See: Statements
expr
The syntax is:
expr;
Example:
i=1;
Also See: Statements
;
Statement: ;
18
Statements
Example:
;
Also See: Statements
stmt
Zero or more semi-colon separated.
The syntax is:
{[stmt]}
Example:
{a=1;
b=1;}
Also See: Statements
19
EXPRESSIONS
Constants
123
Decimal
123L
Forces type to & long (UL also allowed)
123LL
Forces type to & int32;
0123
Octal
0x123
Hex
0b010010
Binary
123.456
Floating Point
123F
Floating Point (FL also allowed)
123.4E-5
Floating Point in scientific notation
'x'
Character
'\010'
Octal Character
'\xA5’
Hex Character
'\c'
Special Character. Where c is one of:
\n Line Feed - Same as \x0a
\r Return Feed - Same as \x0d
\t TAB - Same as \x09
\b Backspace - Same as \x08
\f Form Feed - Same as x0c
\a Bell - Same as \x07
\v Vertical Space - Same as \x0b
\? Question Mark - Same as \x3f
\' Single Quote - Same as \x22
\" Double Quote - Same as \x22
\\ A Single Backslash - Same as \x5c
String (null is added to the end)
"abcdef"
20
Expressions
Identifiers
ABCDE
ID[X]
ID[X][X]
ID.ID
ID->ID
Up to 32 characters beginning with a non-numeric. Valid
characters are A-Z, 0-9 and _ (underscore). By default not
case sensitive Use #CASE to turn on.
Single Subscript
Multiple Subscripts
Structure or union reference
Structure or union reference
Operators
+
+=
[]
&=
&
&
^=
^
l=
l
?:
-/=
/
==
>
>=
++
*
!=
<<=
<
<<
<=
Addition Operator
Addition assignment operator, x+=y, is the same as
x=x+y
Array subscrip operator
Bitwise and assignment operator, x&=y, is the same as
x=x&y
Address operator
Bitwise and operator
Bitwise exclusive or assignment operator, x^=y, is the
same as x=x^y
Bitwise exclusive or operator
Bitwise inclusive or assignment operator, xl=y, is the
same as x=xly
Bitwise inclusive or operator
Conditional Expression operator
Decrement
Division assignment operator, x/=y, is the same as
x=x/y
Division operator
Equality
Greater than operator
Greater than or equal to operator
Increment
Indirection operator
Inequality
Left shift assignment operator, x<<=y, is the same as
x=x<<y
Less than operator
Left Shift operator
Less than or equal to operator
21
CCSC_March 2015-1
&&
!
ll
.
%=
%
*=
*
~
>>=
>>
->
-=
sizeof
Logical AND operator
Logical negation operator
Logical OR operator
Member operator for structures and unions
Modules assignment operator x%=y, is the same as
x=x%y
Modules operator
Multiplication assignment operator, x*=y, is the same as
x=x*y
Multiplication operator
One's complement operator
Right shift assignment, x>>=y, is the same as x=x>>y
Right shift operator
Structure Pointer operation
Subtraction assignment operator, x-=y, is the same as
x=x- y
Subtraction operator
Determines size in bytes of operand
See also: Operator Precedence
Operator Precedence
PIN DESCENDING PRECEDENCE
(expr)
exor++
++expr
expr++
!expr
~expr
(type)expr
*expr
expr*expr
expr+expr
expr<<expr
expr<expr
expr==expr
expr&expr
expr^expr
expr | expr
expr&& expr
expr || expr
expr ? expr:
expr
22
expr/expr
expr-expr
expr>>expr
expr<=expr
expr!=expr
expr->expr
- -expr
+expr
&value
expr%expr
expr>expr
Associativity
expr.expr
Left to Right
Left to Right
expr - Right to Left
-expr
sizeof(type) Right
to
Left
Left to Right
Left to Right
Left to Right
expr>=expr Left to Right
Left to Right
Left to Right
Left to Right
Left to Right
Left to Right
Left to Right
Right
to
Left
Expressions
lvalue = expr
lvalue+=expr
lvalue-=expr
lvalue*=expr
lvalue/=expr
lvalue%=expr
lvalue>>=expr
lvalue<<=expr lvalue&=expr
lvalue^=expr
lvalue|=expr
expr, expr
(Operators on the same line are equal in precedence)
Right
to
Left
Right
to
Left
Right
to
Left
Right
to
Left
Left to Right
23
DATA DEFINITIONS
Data Definitions
This section describes what the basic data types and specifiers are and how variables can be declared
using those types. In C all the variables should be declared before they are used. They can be defined
inside a function (local) or outside all functions (global). This will affect the visibility and life of the
variables.
A declaration consists of a type qualifier and a type specifier, and is followed by a list of one or more
variables of that type.
For example:
int a,b,c,d;
mybit e,f;
mybyte g[3][2];
char *h;
colors j;
struct data_record data[10];
static int i;
extern long j;
Variables can also be declared along with the definitions of the special types.
For example:
enum colors{red, green=2,blue}i,j,k;
i,j,k
// colors is the enum type and
//are variables of that type
SEE ALSO:
Type Specifiers/ Basic Types
Type Qualifiers
Enumerated Types
Structures & Unions
typedef
Named Registers
Type Specifiers
Basic Types
TypeSpecifier
Range
int1
Size
1 bit number
Unsigned
0 to 1
Signed
N/A
Digits
1/2
int8
8 bit number
0 to 255
-128 to 127
2-3
int16
16 bit number
0 to 65535
-32768 to 32767
4-5
24
Data Definitions
int32
32 bit number
0 to 4294967295
float32
32 bit float
-1.5 x 10
C Standard Type
short
char
int
long
long long
float
double
45
to 3.4 x 10
-2147483648 to 2147483647
38
9-10
7-8
Default Type
int1
unsigned int8
int8
int16
int32
float32
N/A
Note: All types, except float char , by default are un-signed; however, may be preceded by unsigned or
signed (Except int64 may only be signed) . Short and long may have the keyword INT following them
with no effect. Also see #TYPE to change the default size.
SHORT INT1 is a special type used to generate very efficient code for bit operations and I/O. Arrays of
bits (INT1 or SHORT ) in RAM are now supported. Pointers to bits are not permitted. The device
header files contain defines for BYTE as an int8 and BOOLEAN as an int1.
Integers are stored in little endian format. The LSB is in the lowest address. Float formats are
described in common questions.
SEE ALSO: Declarations, Type Qualifiers, Enumerated Types, Structures & Unions, typedef, Named
Registers
Type Qualifiers
Type-Qualifier
static
Variable is globally active and initialized to 0. Only accessible from this compilation
unit.
auto
Variable exists only while the procedure is active. This is the default and AUTO need
not be used.
double
Is a reserved word but is not a supported data type.
extern
External variable used with multiple compilation units. No storage is allocated. Is
used to make otherwise out of scope data accessible. there must be a non-extern
definition at the global level in some compilation unit.
register
Is allowed as a qualifier however, has no effect.
_ fixed(n)
Creates a fixed point decimal number where n is how many decimal places to
implement.
unsigned
Data is always positive. This is the default data type if not specified.
signed
Data can be negative or positive.
volatile
Tells the compiler optimizer that this variable can be changed at any point during
execution.
const
Data is read-only. Depending on compiler configuration, this qualifier may just make
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the data read-only -AND/OR- it may place the data into program memory to save
space. (see #DEVICE const=)
rom
Forces data into program memory. Pointers may be used to this data but they can not
be mixed with RAM pointers.
Built-in basic type. Type void is used to indicate no specific type in places where a
type is required.
void
readonly
_bif
__attribute__
Writes to this variable should be dis-allowed
Used for compiler built in function prototypes on the same line
Sets various attributes
SEE ALSO: Declarations, Type Specifiers, Enumerated Types, Structures & Unions, typedef, Named Registers
Enumerated Types
enum enumeration type: creates a list of integer constants.
enum
[id]
{ [ id [ = cexpr]] }
One or more comma separated
The id after enum is created as a type large enough to the largest constant in
the list. The ids in the list are each created as a constant. By default the first id
is set to zero and they increment by one. If a = cexpr follows an id that id will
have the value of the constant expression an d the following list will increment
by one.
For example:
enum colors{red, green=2, blue};
// red will be 0, green will be 2 and
// blue will be 3
SEE ALSO: Declarations, Type Specifiers, Type Qualifiers, Structures & Unions, typedef, Named Registers
Structures and Unions
Struct structure type: creates a collection of one or more variables, possibly of
different types, grouped together as a single unit.
struct[*] [id]
{
type-qualifier [*] id
[:bits];
} [id]
Zero
26
Data Definitions
One or more,
semi-colon
separated
or more
For example:
struct data_record {
int
a[2];
int b : 2; /*2 bits
*/
int
c : 3; /*3
bits*/
int d;
} data_var;
//data_record is a structure type
//data_var is a variable
Union type: holds objects of different types and sizes, with the compiler keeping
track of size and alignment requirements. They provide a way to manipulate
different kinds of data in a single area of storage.
union[*] [id] {
type-qualifier [*] id
One or more,
semi-colon
separated
[:bits];
} [id]
Zero
or more
For example:
union u_tab {
int ival;
long lval;
float fval;
};
//u_tag is a union type that can hold a float
SEE ALSO: Declarations, Type Specifiers, Type Qualifiers, Enumerated Types, typedef, Named
Registers
typedef
If typedef is used with any of the basic or special types it creates a new type
name that can be used in declarations. The identifier does not allocate space but
rather may be used as a type specifier in other data definitions.
typedef
[type-qualifier] [type-specifier] [declarator];
For example:
typedef int mybyte;
// mybyte can be used in declaration to
// specify the int type
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typedef short mybit;
typedef enum {red,
green=2,blue}colors;
// mybyte can be used in declaration to
// specify the int type
//colors can be used to declare
//variable of this enum type
SEE ALSO: Declarations, Type Specifiers, Type Qualifiers, Structures & Unions, Enumerated Types,
Named Registers
Non-RAM Data Definitions
CCS C compiler also provides a custom qualifier addressmod which can be used to
define a memory region that can be RAM, program eeprom, data eeprom or external
memory. Addressmod replaces the older typemod (with a different syntax).
The usage is :
addressmod
(name,read_function,write_function,start_address,end_address,
share);
Where the read_function and write_function should be blank for RAM, or for other
memory should be the following prototype:
// read procedure for reading n bytes from the memory starting at
location addr
void read_function(int32 addr,int8 *ram, int nbytes){
}
//write procedure for writing n bytes to the memory starting at
location addr
void write_function(int32 addr,int8 *ram, int nbytes){
}
For RAM the share argument may be true if unused RAM in this area can be used by the
compiler for standard variables.
Example:
void DataEE_Read(int32 addr, int8 * ram, int bytes) {
int i;
for(i=0;i<bytes;i++,ram++,addr++)
*ram=read_eeprom(addr);
}
void DataEE_Write(int32 addr, int8 * ram, int bytes) {
int i;
for(i=0;i<bytes;i++,ram++,addr++)
write_eeprom(addr,*ram);
}
addressmod (DataEE,DataEE_read,DataEE_write,5,0xff);
// would define a region called DataEE between
// 0x5 and 0xff in the chip data EEprom.
void main (void)
{
int DataEE test;
28
Data Definitions
int x,y;
x=12;
test=x; // writes x to the Data EEPROM
y=test; // Reads the Data EEPROM
}
Note: If the area is defined in RAM then read and write functions are not required, the
variables assigned in the memory region defined by the addressmod can be treated as a
regular variable in all valid expressions. Any structure or data type can be used with an
addressmod. Pointers can also be made to an addressmod data type. The #type
directive can be used to make this memory region as default for variable allocations.
The syntax is :
#type default=addressmodname
that
// all the variable declarations
// follow will use this memory
region
#type default=
// goes back to the default mode
For example:
Type default=emi
defined
char buffer[8192];
#include <memoryhog.h>
#type default=
//emi is the addressmod name
Using Program Memory for Data
CCS C Compiler provides a few different ways to use program memory for data. The different ways are discussed
below:
Constant Data:
The const qualifier will place the variables into program memory. If the keyword const is used before the identifier,
the identifier is treated as a constant. Constants should be initialized and may not be changed at run-time. This is an
easy way to create lookup tables.
The rom Qualifier puts data in program memory with 3 bytes per instruction space. The address used for ROM data
is not a physical address but rather a true byte address. The & operator can be used on ROM variables however the
address is logical not physical.
The syntax is:
const type id[cexpr] = {value}
For example:
Placing data into ROM
const int table[16]={0,1,2...15}
Placing a string into ROM
const char cstring[6]={"hello"}
Creating pointers to constants
const char *cptr;
cptr = string;
The #org preprocessor can be used to place the constant to specified address blocks.
For example:
The constant ID will be at 1C00.
#ORG 0x1C00, 0x1C0F
CONST CHAR ID[10]= {"123456789"};
Note: Some extra code will precede the 123456789.
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The function label_address can be used to get the address of the constant. The constant variable can be accessed
in the code. This is a great way of storing constant data in large programs. Variable length constant strings can be
stored into program memory.
A special method allows the use of pointers to ROM. This method does not contain extra code at the start of the
structure as does constant.
For example:
char rom commands[] = {“put|get|status|shutdown”};
The compiler allows a non-standard C feature to implement a constant array of variable length strings.
The syntax is:
const char id[n] [*] = { "string", "string" ...};
Where n is optional and id is the table identifier.
For example:
const char colors[] [*] = {"Red", "Green", "Blue"};
#ROM directive:
Another method is to use #rom to assign data to program memory.
The syntax is:
#rom address = {data, data, … , data}
For example:
Places 1,2,3,4 to ROM addresses starting at 0x1000
#rom 0x1000 = {1, 2, 3, 4}
Places null terminated string in ROM
#rom 0x1000={"hello"}
This method can only be used to initialize the program memory.
Built-in-Functions:
The compiler also provides built-in functions to place data in program memory, they are:

write_program_eeprom(address,data);
- Writes data to program memory

write_program_memory(address, dataptr, count);
- Writes count bytes of data from dataptr to address in program memory.
Please refer to the help of these functions to get more details on their usage and limitations regarding erase
procedures. These functions can be used only on chips that allow writes to program memory. The compiler uses the
flash memory erase and write routines to implement the functionality.
The data placed in program memory using the methods listed above can be read from width the following functions:
 read_program_memory((address, dataptr, count)
- Reads count bytes from program memory at address to RAM at dataptr.
These functions can be used only on chips that allow reads from program memory. The compiler uses the flash
memory read routines to implement the functionality.
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Data Definitions
Named Registers
The CCS C Compiler supports the new syntax for filing a variable at the location of a processor register.
This syntax is being proposed as a C extension for embedded use. The same functionality is provided
with the non-standard #byte, #word, #bit and #locate.
The syntax is:
register _name type id;
Or
register constant type id;
name is a valid SFR name with an underscore before it.
Examples:
register _status int8 status_reg;
register _T1IF int8 timer_interrupt;
register 0x04 int16 file_select_register;
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FUNCTION DEFINITION
Function Definition
The format of a function definition is as follows:
[qualifier] id
( [type-specifier id]
)
{ [stmt] }
Optional See Below
Zero or more comma
separated.
See Data Types
Zero or more Semi-colon separated. See
Statements.
The qualifiers for a function are as follows:
 VOID
 type-specifier
 #separate
 #inline
 #int_..
When one of the above are used and the function has a prototype (forward declaration of the function before it is
defined) you must include the qualifier on both the prototype and function definition.
A (non-standard) feature has been added to the compiler to help get around the problems created by the fact that
pointers cannot be created to constant strings. A function that has one CHAR parameter will accept a constant string
where it is called. The compiler will generate a loop that will call the function once for each character in the string.
Example:
void lcd_putc(char c ) {
...
}
lcd_putc ("Hi There.");
SEE ALSO:
Overloaded Functions
Reference Parameters
Default Parameters
Variable Parameters
Overloaded Functions
Overloaded functions allow the user to have multiple functions with the same name, but they must accept different
parameters.
Here is an example of function overloading: Two functions have the same name but differ in the types of parameters.
The compiler determines which data type is being passed as a parameter and calls the proper function.
This function finds the square root of a long integer variable.
32
Function Definition
long FindSquareRoot(long n){
}
This function finds the square root of a float variable.
float FindSquareRoot(float n){
}
FindSquareRoot is now called. If variable is of long type, it will call the first FindSquareRoot() example. If variable is of
float type, it will call the second FindSquareRoot() example.
result=FindSquareRoot(variable);
Reference Parameters
The compiler has limited support for reference parameters. This increases the readability of code and the efficiency of
some inline procedures. The following two procedures are the same. The one with reference parameters will be
implemented with greater efficiency when it is inline.
funct_a(int*x,int*y){
/*Traditional*/
if(*x!=5)
*y=*x+3;
}
funct_a(&a,&b);
funct_b(int&x,int&y){
/*Reference params*/
if(x!=5)
y=x+3;
}
funct_b(a,b);
Default Parameters
Default parameters allows a function to have default values if nothing is passed to it when called.
int mygetc(char *c, int n=100){
}
This function waits n milliseconds for a character over RS232. If a character is received, it saves it to the pointer c
and returns TRUE. If there was a timeout it returns FALSE.
//gets a char, waits 100ms for timeout
mygetc(&c);
//gets a char, waits 200ms for a timeout
mygetc(&c, 200);
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Variable Argument Lists
The compiler supports a variable number of parameters. This works like the ANSI requirements except that it does
not require at least one fixed parameter as ANSI does. The function can be passed any number of variables and any
data types. The access functions are VA_START, VA_ARG, and VA_END. To view the number of arguments
passed, the NARGS function can be used.
/*
stdarg.h holds the macros and va_list data type needed for variable number of parameters.
*/
#include <stdarg.h>
A function with variable number of parameters requires two things. First, it requires the ellipsis (...), which must be the
last parameter of the function. The ellipsis represents the variable argument list. Second, it requires one more
variable before the ellipsis (...). Usually you will use this variable as a method for determining how many variables
have been pushed onto the ellipsis.
Here is a function that calculates and returns the sum of all variables:
int Sum(int count, ...)
{
//a pointer to the argument list
va_list al;
int x, sum=0;
//start the argument list
//count is the first variable before the ellipsis
va_start(al, count);
while(count--) {
//get an int from the list
x = var_arg(al, int);
sum += x;
}
//stop using the list
va_end(al);
return(sum);
}
Some examples of using this new function:
x=Sum(5, 10, 20, 30, 40, 50);
y=Sum(3, a, b, c);
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FUNCTIONAL OVERVIEW
I2C
I2C™ is a popular two-wire communication protocol developed by Phillips. Many PIC microcontrollers support
hardware-based I2C™. CCS offers support for the hardware-based I2C™ and a software-based master I2C™
device. (For more information on the hardware-based I2C module, please consult the datasheet for you target device;
not all PICs support I2C™.)
Relevant Functions:
i2c_start()
i2c_write(data)
i2c_read()
i2c_stop()
i2c_poll()
Issues a start command when in the I2C master mode.
Sends a single byte over the I2C interface.
Reads a byte over the I2C interface.
Issues a stop command when in the I2C master mode.
Returns a TRUE if the hardware has received a byte in the buffer.
Relevant Preprocessor:
#USE I2C
Configures the compiler to support I2C™ to your specifications.
Relevant Interrupts:
#INT_SSP
#INT_BUSCOL
#INT_I2C
#INT_BUSCOL2
#INT_SSP2
Relevant Include Files:
None, all functions built-in
Relevant getenv() Parameters:
I2C_SLAVE
I2C_MASTER
Example Code:
#define Device_SDA PIN_C3
#define Device_SLC PIN_C4
#use i2c(master, sda=Device_SDA,
scl=Device_SCL)
..
..
BYTE data;
i2c_start();
i2c_write(data);
i2c_stop();
I2C or SPI activity
Bus Collision
I2C Interrupt (Only on 14000)
Bus Collision (Only supported on some PIC18's)
I2C or SPI activity (Only supported on some PIC18's)
Returns a 1 if the device has I2C slave H/W
Returns a 1 if the device has a I2C master H/W
// Pin defines
// Configure Device as Master
// Data to be transmitted
// Issues a start command when in the I2C master mode.
// Sends a single byte over the I2C interface.
// Issues a stop command when in the I2C master mode.
ADC
These options let the user configure and use the analog to digital converter module. They are only available on
devices with the ADC hardware. The options for the functions and directives vary depending on the chip and are
listed in the device header file. On some devices there are two independent ADC modules, for these chips the
second module is configured using secondary ADC setup functions (Ex. setup_ADC2).
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Relevant Functions:
setup_adc(mode)
setup_adc_ports(value)
set_adc_channel(channel)
read_adc(mode)
adc_done()
Relevant Preprocessor:
#DEVICE ADC=xx
Relevant Interrupts:
INT_AD
INT_ADOF
Sets up the a/d mode like off, the adc clock etc.
Sets the available adc pins to be analog or digital.
Specifies the channel to be use for the a/d call.
Starts the conversion and reads the value. The mode can also control
the functionality.
Returns 1 if the ADC module has finished its conversion.
Configures the read_adc return size. For example, using a PIC with a
10 bit A/D you can use 8 or 10 for xx- 8 will return the most significant
byte, 10 will return the full A/D reading of 10 bits.
Interrupt fires when a/d conversion is complete
Interrupt fires when a/d conversion has timed out
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
ADC_CHANNELS
ADC_RESOLUTION
Example Code:
#DEVICE ADC=10
...
long value;
...
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(ALL_ANALOG);
set_adc_channel(0);
delay_us(10);
value=read_adc();
read_adc(ADC_START_ONLY);
value=read_adc(ADC_READ_ONLY);
Number of A/D channels
Number of bits returned by read_adc
//enables the a/d module
//and sets the clock to internal adc clock
//sets all the adc pins to analog
//the next read_adc call will read channel 0
//a small delay is required after setting the channel
//and before read
//starts the conversion and reads the result
//and store it in value
//only starts the conversion
//reads the result of the last conversion and store it in //value. Assuming
the device hat a 10bit ADC module, //value will range between 0-3FF. If
#DEVICE ADC=8 had //been used instead the result will yield 0-FF. If
#DEVICE //ADC=16 had been used instead the result will yield 0//FFC0
Analog Comparator
These functions set up the analog comparator module. Only available in some devices.
Relevant Functions:
setup_comparator(mode)
Enables and sets the analog comparator module. The options
vary depending on the chip. Refer to the header file for details.
Relevant Preprocessor:
None
Relevant Interrupts:
INT_COMP
36
Interrupt fires on comparator detect. Some chips have more
than one comparator unit, and thus, more interrupts.
Functional Overview
Relevant Include Files:
None, all functions built-in
Relevant getenv() Parameters:
Returns 1 if the device has a comparator
COMP
Example Code:
setup_comparator(A4_A5_NC_NC);
if(C1OUT)
output_low(PIN_D0);
else
output_high(PIN_D1);
CAN Bus
These functions allow easy access to the Controller Area Network (CAN) features included with the MCP2515 CAN
interface chip and the PIC18 MCU. These functions will only work with the MCP2515 CAN interface chip and PIC
microcontroller units containing either a CAN or an ECAN module. Some functions are only available for the ECAN
module and are specified by the work ECAN at the end of the description. The listed interrupts are no available to the
MCP2515 interface chip.
Relevant Functions:
can_init(void);
Initializes the CAN module and clears all the filters and masks so
that all messages can be received from any ID.
can_set_baud(void);
Initializes the baud rate of the CAN bus to125kHz, if using a 20 MHz
clock and the default CAN-BRG defines, it is called inside the
can_init() function so there is no need to call it.
can_set_mode
(CAN_OP_MODE mode);
Allows the mode of the CAN module to be changed to configuration
mode, listen mode, loop back mode, disabled mode, or normal
mode.
can_set_functional_mode
(CAN_FUN_OP_MODE mode);
Allows the functional mode of ECAN modules to be changed to
legacy mode, enhanced legacy mode, or first in firstout (fifo) mode.
ECAN
can_set_id(int* addr, int32 id, int1 ext);
Can be used to set the filter and mask ID's to the value specified by
addr. It is also used to set the ID of the message to be sent.
can_get_id(int * addr, int1 ext);
Returns the ID of a received message.
can_putd
(int32 id, int * data, int len,
int priority, int1 ext, int1 rtr);
Constructs a CAN packet using the given arguments and places it in
one of the available transmit buffers.
can_getd
(int32 & id, int * data, int & len,
struct rx_stat & stat);
can_enable_rtr(PROG_BUFFER b);
Retrieves a received message from one of the CAN buffers and
stores the relevant data in the referenced function parameters.
can_disable_rtr(PROG_BUFFER b);
Disables the automatic response feature. ECAN
can_load_rtr
(PROG_BUFFER b, int * data, int len);
Creates and loads the packet that will automatically transmitted
when the triggering ID is received. ECAN
Enables the automatic response feature which automatically sends
a user created packet when a specified ID is received. ECAN
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can_enable_filter(long filter);
Enables one of the extra filters included in the ECAN module. ECAN
can_disable_filter(long filter);
Disables one of the extra filters included in the ECAN module.
ECAN
can_associate_filter_to_buffer
(CAN_FILTER_ASSOCIATION_BUFFERS
buffer,CAN_FILTER_ASSOCIATION
filter);
Used to associate a filter to a specific buffer. This allows only
specific buffers to be filtered and is available in the ECAN module.
ECAN
can_associate_filter_to_mask
(CAN_MASK_FILTER_ASSOCIATE
mask,
CAN_FILTER_ASSOCIATION filter);
Used to associate a mask to a specific buffer. This allows only
specific buffer to have this mask applied. This feature is available in
the ECAN module. ECAN
can_fifo_getd(int32 & id,int * data,
int &len,struct rx_stat & stat);
Retrieves the next buffer in the fifo buffer. Only available in the
ECON module while operating in fifo mode. ECAN
Relevant Preprocessor:
None
Relevant Interrupts:
#int_canirx
#int_canrx0
#int_canrx1
This interrupt is triggered when an invalid packet is received on the
CAN.
This interrupt is triggered when the PIC is woken up by activity on
the CAN.
This interrupt is triggered when there is an error in the CAN module.
This interrupt is triggered when transmission from buffer 0 has
completed.
This interrupt is triggered when transmission from buffer 1 has
completed.
This interrupt is triggered when transmission from buffer 2 has
completed.
This interrupt is triggered when a message is received in buffer 0.
This interrupt is triggered when a message is received in buffer 1.
Relevant Include Files:
can-mcp2510.c
can-18xxx8.c
can-18F4580.c
Drivers for the MCP2510 and MCP2515 interface chips
Drivers for the built in CAN module
Drivers for the build in ECAN module
#int_canwake
#int_canerr
#int_cantx0
#int_cantx1
#int_cantx2
Relevant getenv() Parameters:
none
Example Code:
can_init();
can_putd(0x300,data,8,3,TRUE,FALSE);
can_getd(ID,data,len,stat);
38
// initializes the CAN bus
// places a message on the CAN buss with
// ID = 0x300 and eight bytes of data pointed to by
// “data”, the TRUE creates an extended ID, the
// FALSE creates
// retrieves a message from the CAN bus storing the
// ID in the ID variable, the data at the array pointed to by
// “data', the number of data bytes in len, and statistics
// about the data in the stat structure.
Functional Overview
CCP
These options lets to configure and use the CCP module. There might be multiple CCP modules for a device. These
functions are only available on devices with CCP hardware. They operate in 3 modes: capture, compare and PWM.
The source in capture/compare mode can be timer1 or timer3 and in PWM can be timer2 or timer4. The options
available are different for different devices and are listed in the device header file. In capture mode the value of the
timer is copied to the CCP_X register when the input pin event occurs. In compare mode it will trigger an action when
timer and CCP_x values are equal and in PWM mode it will generate a square wave.
Relevant Functions:
setup_ccp1(mode)
set_pwm1_duty(value)
Sets the mode to capture, compare or PWM. For capture
The value is written to the pwm1 to set the duty.
Relevant Preprocessor:
None
Relevant Interrupts :
INT_CCP1
Interrupt fires when capture or compare on CCP1
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
CCP1
Example Code:
#int_ccp1
void isr()
{
rise = CCP_1;
fall = CCP_2;
pulse_width = fall - rise;
}
..
setup_ccp1(CCP_CAPTURE_RE);
setup_ccp2(CCP_CAPTURE_FE);
setup_timer_1(T1_INTERNAL);
Returns 1 if the device has CCP1
//CCP_1 is the time the pulse went high
//CCP_2 is the time the pulse went low
//pulse width
// Configure CCP1 to capture rise
// Configure CCP2 to capture fall
// Start timer 1
Some chips also have fuses which allows to multiplex the ccp/pwm on different pins. So check the fuses to
see which pin is set by default. Also fuses to enable/disable pwm outputs.
Code Profile
Profile a program while it is running. Unlike in-circuit debugging, this tool grabs information
while the program is running and provides statistics, logging and tracing of it's execution. This
is accomplished by using a simple communication method between the processor and the ICD
with minimal side-effects to the timing and execution of the program. Another benefit of code
profile versus in-circuit debugging is that a program written with profile support enabled will run
correctly even if there is no ICD connected.
In order to use Code Profiling, several functions and pre-processor statements need to be included in the project
being compiled and profiled. Doing this adds the proper code profile run-time support on the microcontroller.
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CCSC_March 2015-1
See the help file in the Code Profile tool for more help
and usage examples.
Relevant Functions:
profileout()
Relevant Pre-Processor:
#use profile()
Send a user specified message or variable to be displayed or
logged by the code profile tool.
Global configuration of the code profile run-time on the
microcontroller.
#profile
Dynamically enable/disable specific elements of the profiler.
Relevant Interrupts:
The profiler can be configured to use a microcontroller's internal
timer for more accurate timing of events over the clock on the PC.
This timer is configured using the #profile pre-processor
command.
Relevant Include Files:
None – all the functions are built into the compiler.
Relevant getenv():
None
Example Code:
#include <18F4520.h>
#use delay(crystal=10MHz, clock=40MHz)
#profile functions, parameters
void main(void)
{
int adc;
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(0);
for(;;)
{
adc = read_adc();
profileout(adc);
delay_ms(250);
}
}
Configuration Memory
On all PIC18 Family of chips, the configuration memory is readable and writable. This functionality is not available on
the PIC16 Family of devices..
Relevant Functions:
write_configuration_memory
(ramaddress, count)
or
write_configuration_memory
(offset,ramaddress, count)
read_configuration_memory
40
Writes count bytes, no erase needed
Writes count bytes, no erase needed starting at byte address offset
Read count bytes of configuration memory
Functional Overview
(ramaddress,count)
Relevant Preprocessor:
None
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
For PIC18f452
int16 data=0xc32;
...
write_configuration_memory(data,2);
//writes 2 bytes to the configuration memory
DAC
These options let the user configure and use the digital to analog converter module. They are only available on
devices with the DAC hardware. The options for the functions and directives vary depending on the chip and are
listed in the device header file.
Relevant Functions:
setup_dac(divisor)
Sets up the DAC e.g. Reference voltages
dac_write(value)
Writes the 8-bit value to the DAC module
Sets up the d/a mode e.g. Right enable, clock divisor
Writes the 16-bit value to the specified channel
Relevant Preprocessor:
#USE DELAY(clock=20M, Aux: crystal=6M, clock=3M)
Relevant Interrupts:
None
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
int8 i=0;
setup_dac (DAC_VSS_VDD);
while (TRUE) {
itt;
dac_write(i);
}
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Data Eeprom
The data eeprom memory is readable and writable in some chips. These options lets the user read and write to the
data eeprom memory. These functions are only available in flash chips.
Relevant Functions:
(8 bit or 16 bit depending on the
device)
read_eeprom(address)
Reads the data EEPROM memory location
write_eeprom(address, value)
Erases and writes value to data EEPROM location address.
Reads N bytes of data EEPROM starting at memory location address. The
maximum return size is int64.
Reads from EEPROM to fill variable starting at address
Reads N bytes, starting at address, to pointer
Writes value to EEPROM address
Writes N bytes to address from pointer
Relevant Preprocessor:
#ROM address={list}
write_eeprom = noint
Relevant Interrupts:
INT_EEPROM
Can also be used to put data EEPROM memory data into the hex file.
Allows interrupts to occur while the write_eeprom() operations is polling the
done bit to check if the write operations has completed. Can be used as
long as no EEPROM operations are performed during an ISR.
Interrupt fires when EEPROM write is complete
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
DATA_EEPROM
Example Code:
For 18F452
#rom 0xf00000={1,2,3,4,5}
Size of data EEPROM memory.
//inserts this data into the hex file. The data eeprom address
//differs for different family of chips. Please refer to the
//programming specs to find the right value for the device
write_eeprom(0x0,0x12);
value=read_eeprom(0x0);
//writes 0x12 to data eeprom location 0
//reads data eeprom location 0x0 returns 0x12
#ROM 0x007FFC00={1,2,3,4,5}
// Inserts this data into the hex file
// The data EEPROM address differs between PICs
// Please refer to the device editor for device specific values.
// Writes 0x1337 to data EEPROM location 10.
// Reads data EEPROM location 10 returns 0x1337.
write_eeprom(0x10, 0x1337);
value=read_eeprom(0x0);
Data Signal Modulator
The Data Signal Modulator (DSM) allows the user to mix a digital data stream (the “modulator signal”) with a carrier
signal to produce a modulated output. Both the carrier and the modulator signals are supplied to the DSM module,
either internally from the output of a peripheral, or externally through an input pin. The modulated output signal is
generated by performing a logical AND operation of both the carrier and modulator signals and then it is provided to
the MDOUT pin. Using this method, the DSM can generate the following types of key modulation schemes:

42
Frequency Shift Keying (FSK)
Functional Overview


Phase Shift Keying (PSK)
On-Off Keying (OOK)
Relevant Functions:
(8 bit or 16 bit depending on the
device)
setup_dsm(mode,source,carrier)
Configures the DSM module and selects the source signal and carrier
signals.
setup_dsm(TRUE)
Enables the DSM module.
setup_dsm(FALSE)
Disables the DSM module.
Relevant Preprocessor:
None
Relevant Interrupts:
None
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
setup_dsm(DSM_ENABLED |
DSM_OUTPUT_ENABLED,
DSM_SOURCE_UART1,
DSM_CARRIER_HIGH_VSS |
//Enables DSM module with the output enabled and selects UART1
//as the source signal and VSS as the high carrier signal and OC1's
//PWM output as the low carrier signal.
DSM_CARRIER_LOW_OC1);
if(input(PIN_B0))
setup_dsm(FALSE);
else
setup_dsm(TRUE);
Disable DSM module
Enable DSM module
External Memory
Some PIC18 devices have the external memory functionality where the external memory can be mapped to external
memory devices like (Flash, EPROM or RAM). These functions are available only on devices that support external
memory bus.
General Purpose I/O
These options let the user configure and use the I/O pins on the device. These functions will affect the pins that are
listed in the device header file.
Relevant Functions:
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output_high(pin)
output_low(pin)
output_float(pin)
output_x(value)
output_bit(pin,value)
input(pin)
input_state(pin)
set_tris_x(value)
input_change_x( )
Relevant Preprocessor:
#USE STANDARD_IO(port)
#USE FAST_IO(port)
#USE FIXED_IO
(port_outputs=;in,pin?)
Sets the given pin to high state.
Sets the given pin to the ground state.
Sets the specified pin to the input mode. This will allow the pin to float high to
represent a high on an open collector type of connection.
Outputs an entire byte to the port.
Outputs the specified value (0,1) to the specified I/O pin.
The function returns the state of the indicated pin.
This function reads the level of a pin without changing the direction of the pin
as INPUT() does.
Sets the value of the I/O port direction register. A '1' is an input and '0' is for
output.
This function reads the levels of the pins on the port, and compares them to the
last time they were read to see if there was a change, 1 if there was, 0 if there
wasn't.
This compiler will use this directive be default and it will automatically inserts
code for the direction register whenever an I/O function like output_high() or
input() is used.
This directive will configure the I/O port to use the fast method of performing
I/O. The user will be responsible for setting the port direction register using the
set_tris_x() function.
This directive set particular pins to be used an input or output, and the compiler
will perform this setup every time this pin is used.
Relevant Interrupts:
None
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
PIN:pb
Returns a 1 if bit b on port p is on this part
Example Code:
#use fast_io(b)
...
Int8 Tris_value= 0x0F;
int1 Pin_value;
...
set_tris_b(Tris_value);
output_high(PIN_B7);
If(input(PIN_B0)){
output_high(PIN_B7);}
//Sets B0:B3 as input and B4:B7 as output
//Set the pin B7 to High
//Read the value on pin B0, set B7 to low if pin B0 is high
Internal LCD
Some families of PIC microcontrollers can drive a glass segment LCD directly, without the need of an LCD controller.
For example, the PIC16C92X, PIC16F91X, and PIC16F193X series of chips have an internal LCD driver module.
Relevant Functions:
setup_lcd
(mode, prescale, [segments])
lcd_symbol
(symbol, segment_b7 ...
44
Configures the LCD Driver Module to use the specified mode, timer prescaler,
and segments. For more information on valid modes and settings, see the
setup_lcd( ) manual page and the *.h header file for the PIC micro-controller
being used.
The specified symbol is placed on the desired segments, where segment_b7
to segment_b0 represent SEGXX pins on the PIC micro-controller. For
Functional Overview
segment_b0)
example, if bit 0 of symbol is set, then segment_b0 is set, and if segment_b0
is 15, then SEG15 would be set.
lcd_load(ptr, offset, length)
Writes length bytes of data from pointer directly to the LCD segment
memory, starting with offset.
lcd_contrast (contrast)
Passing a value of 0 – 7 will change the contrast of the LCD segments, 0
being the minimum, 7 being the maximum.
Relevant Preprocessor:
None
Relevant Interrupts:
#int_lcd
LCD frame is complete, all pixels displayed
Relevant Inlcude Files:
None, all functions built-in to the compiler.
Relevant getenv() Parameters:
LCD
Returns TRUE if the device has an Internal LCD Driver Module.
Example Program:
// How each segment of the LCD is set (on or off) for the ASCII digits 0 to 9.
byte CONST DIGIT_MAP[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xE6};
// Define the segment information for the first digit of the LCD
#define DIGIT1 COM1+20, COM1+18, COM2+18, COM3+20, COM2+28, COM1+28, COM2+20, COM3+18
// Displays the digits 0 to 9 on the first digit of the LCD.
for(i = 0; i <= 9; i++) {
lcd_symbol( DIGIT_MAP[i], DIGIT1 );
delay_ms( 1000 );
}
Internal Oscillator
Many chips have internal oscillator. There are different ways to configure the internal oscillator. Some chips have a
constant 4 Mhz factory calibrated internal oscillator. The value is stored in some location (mostly the highest program
memory) and the compiler moves it to the osccal register on startup. The programmers save and restore this value
but if this is lost they need to be programmed before the oscillator is functioning properly. Some chips have factory
calibrated internal oscillator that offers software selectable frequency range(from 31Kz to 8 Mhz) and they have a
default value and can be switched to a higher/lower value in software. They are also software tunable. Some chips
also provide the PLL option for the internal oscillator.
Relevant Functions:
setup_oscillator(mode, finetune)
Sets the value of the internal oscillator and also tunes it. The options vary
depending on the chip and are listed in the device header files.
Relevant Preprocessor:
None
Relevant Interrupts:
INT_OSC_FAIL or INT_OSCF
Interrupt fires when the system oscillator fails and the processor switches to
the internal oscillator.
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
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CCSC_March 2015-1
For PIC18F8722
setup_oscillator(OSC_32MHZ);
//sets the internal oscillator to 32MHz (PLL enabled)
If the internal oscillator fuse option are specified in the #fuses and a valid clock is specified in the #use
delay(clock=xxx) directive the compiler automatically sets up the oscillator. The #use delay statements
should be used to tell the compiler about the oscillator speed.
Interrupts
The following functions allow for the control of the interrupt subsystem of the microcontroller. With these functions,
interrupts can be enabled, disabled, and cleared. With the preprocessor directives, a default function can be called for
any interrupt that does not have an associated ISR, and a global function can replace the compiler generated
interrupt dispatcher.
Relevant Functions:
disable_interrupts()
Disables the specified interrupt.
enable_interrupts()
Enables the specified interrupt.
ext_int_edge()
Enables the edge on which the edge interrupt should trigger. This can be
either rising or falling edge.
clear_interrupt()
This function will clear the specified interrupt flag. This can be used if a global
isr is used, or to prevent an interrupt from being serviced.
interrupt_active()
This function checks the interrupt flag of specified interrupt and returns true if
flag is set.
This function checks the interrupt enable flag of the specified interrupt and
returns TRUE if set.
interrupt_enabled()
Relevant Preprocessor:
#DEVICE HIGH_INTS=
#INT_XXX fast
Relevant Interrupts:
#int_default
This directive tells the compiler to generate code for high priority interrupts.
This directive tells the compiler that the specified interrupt should be treated
as a high priority interrupt.
This directive specifies that the following function should be called if an
interrupt is triggered but no routine is associated with that interrupt.
#int_global
This directive specifies that the following function should be called whenever
an interrupt is triggered. This function will replace the compiler generated
interrupt dispatcher.
#int_xxx
This directive specifies that the following function should be called whenever
the xxx interrupt is triggered. If the compiler generated interrupt dispatcher is
used, the compiler will take care of clearing the interrupt flag bits.
Relevant Include Files:
none, all functions built in.
Relevant getenv() Parameters:
none
Example Code:
#int_timer0
void timer0interrupt()
enable_interrupts(TIMER0);
46
// #int_timer associates the following function with the
// interrupt service routine that should be called
// enables the timer0 interrupt
Functional Overview
disable_interrtups(TIMER0);
clear_interrupt(TIMER0);
// disables the timer0 interrupt
// clears the timer0 interrupt flag
Low Voltage Detect
These functions configure the high/low voltage detect module. Functions available on the chips that have the low
voltage detect hardware.
Relevant Functions:
setup_low_volt_detect(mode)
Sets the voltage trigger levels and also the mode (below or above in case
of the high/low voltage detect module). The options vary depending on the
chip and are listed in the device header files.
Relevant Preprocessor:
None
Relevant Interrupts :
INT_LOWVOLT
Interrupt fires on low voltage detect
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
For PIC18F8722
setup_low_volt_detect
(LVD_36|LVD_TRIGGER_ABOVE);
//sets the trigger level as 3.6 volts and
// trigger direction as above. The interrupt
//if enabled is fired when the voltage is
//above 3.6 volts.
PMP/EPMP
The Parallel Master Port (PMP)/Enhanced Parallel Master Port (EPMP) is a parallel 8-bit/16-bit I/O module
specifically designed to communicate with a wide variety of parallel devices. Key features of the PMP module are:
· 8 or 16 Data lines
· Up to 16 or 32 Programmable Address Lines
· Up to 2 Chip Select Lines
· Programmable Strobe option
· Address Auto-Increment/Auto-Decrement
· Programmable Address/Data Multiplexing
· Programmable Polarity on Control Signals
· Legacy Parallel Slave(PSP) Support
· Enhanced Parallel Slave Port Support
· Programmable Wait States
Relevant Functions:
setup_psp (options,address_mask)
This will setup the PMP/EPMP module for various mode and specifies
which address lines to be used.
This will setup the PSP module for various mode and specifies which
address lines to be used.
47
CCSC_March 2015-1
setup_pmp_csx(options,[offset])
setup_psp_es(options)
psp_input_full()
psp_output_full()
Relevant Preprocessor:
None
Relevant Interrupts :
#INT_PMP
Sets up the Chip Select X Configuration, Mode and Base Address registers
Sets up the Chip Select X Configuration and Mode registers
Write the data byte to the next buffer location.
This will write a byte of data to the next buffer location or will write a byte to
the specified buffer location.
Reads a byte of data.
psp_read() will read a byte of data from the next buffer location and
psp_read ( address ) will read the buffer location address.
Configures the address register of the PMP module with the destination
address during Master mode operation.
This will return the status of the output buffer underflow bit.
This will return the status of the input buffers.
This will return the status of the input buffers.
This will return the status of the output buffers.
This will return the status of the output buffers.
Interrupt on read or write strobe
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
setup_pmp( PAR_ENABLE |
PAR_MASTER_MODE_1 |
PAR_STOP_IN_IDLE,0x00FF );
Sets up Master mode with address lines PMA0:PMA7
If ( pmp_output_full ( ))
{
pmp_write(next_byte);
}
Power PWM
These options lets the user configure the Pulse Width Modulation (PWM) pins. They are only available on devices
equipped with PWM. The options for these functions vary depending on the chip and are listed in the device header
file.
Relevant Functions:
setup_power_pwm(config)
Sets up the PWM clock, period, dead time etc.
setup_power_pwm_pins(module x)
Configure the pins of the PWM to be in
Complimentary, ON or OFF mode.
set_power_pwmx_duty(duty)
Stores the value of the duty cycle in the PDCXL/H register. This
duty cycle value is the time for which the PWM is in active state.
set_power_pwm_override(pwm,override,value)
This function determines whether the OVDCONS or the PDC
registers determine the PWM output .
Relevant Preprocessor:
None
48
Functional Overview
Relevant Interrupts:
#INT_PWMTB
PWM Timebase Interrupt (Only available on PIC18XX31)
Relevant getenv() Parameters:
None
Example Code:
....
long duty_cycle, period;
...
// Configures PWM pins to be ON,OFF or in Complimentary mode.
setup_power_pwm_pins(PWM_COMPLEMENTARY ,PWM_OFF, PWM_OFF, PWM_OFF);
//Sets up PWM clock , postscale and period. Here period is used to set the
//PWM Frequency as follows:
//Frequency = Fosc / (4 * (period+1) *postscale)
setup_power_pwm(PWM_CLOCK_DIV_4|PWM_FREE_RUN,1,0,period,0,1,0);
set_power_pwm0_duty(duty_cycle));
// Sets the duty cycle of the PWM 0,1 in
//Complementary mode
Program Eeprom
The Flash program memory is readable and writable in some chips and is just readable in some. These options lets
the user read and write to the Flash program memory. These functions are only available in flash chips.
Relevant Functions:
read_program_eeprom(address)
Reads the program memory location (16 bit or 32 bit depending on the
device).
write_program_eeprom(address,
value)
erase_program_eeprom(address)
Erases FLASH_ERASE_SIZE bytes in program memory.
write_program_memory(address,dat
aptr,count)
Writes count bytes to program memory from dataptr to address. When
address is a mutiple of FLASH_ERASE_SIZE an erase is also performed.
read_program_memory(address,dat
aptr,count)
Read count bytes from program memory at address to dataptr.
Relevant Preprocessor:
#ROM address={list}
#DEVICE(WRITE_EEPROM=ASYNC)
Relevant Interrupts:
INT_EEPROM
Writes value to program memory location address.
Can be used to put program memory data into the hex file.
Can be used with #DEVICE to prevent the write function from hanging.
When this is used make sure the eeprom is not written both inside and
outside the ISR.
Interrupt fires when eeprom write is complete.
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters
PROGRAM_MEMORY
READ_PROGRAM
Size of program memory
Returns 1 if program memory can be read
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CCSC_March 2015-1
FLASH_WRITE_SIZE
FLASH_ERASE_SIZE
Smallest number of bytes written in flash
Smallest number of bytes erased in flash
Example Code:
For 18F452 where the write size is 8 bytes and erase size is 64 bytes
#rom 0xa00={1,2,3,4,5}
//inserts this data into the hex file.
erase_program_eeprom(0x1000);
//erases 64 bytes strting at 0x1000
write_program_eeprom(0x1000,0x12 //writes 0x1234 to 0x1000
34);
value=read_program_eeprom(0x100 //reads 0x1000 returns 0x1234
0);
write_program_memory(0x1000,data //erases 64 bytes starting at 0x1000 as 0x1000 is a multiple
,8);
//of 64 and writes 8 bytes from data to 0x1000
read_program_memory(0x1000,valu //reads 8 bytes to value from 0x1000
e,8);
erase_program_eeprom(0x1000);
//erases 64 bytes starting at 0x1000
write_program_memory(0x1010,data //writes 8 bytes from data to 0x1000
,8);
read_program_memory(0x1000,valu //reads 8 bytes to value from 0x1000
e,8);
For chips where getenv("FLASH_ERASE_SIZE") > getenv("FLASH_WRITE_SIZE")
WRITE_PROGRAM_EEPROM Writes 2 bytes,does not erase (use ERASE_PROGRAM_EEPROM)
WRITE_PROGRAM_MEMORY Writes any number of bytes,will erase a block whenever the first (lowest)
byte in a block is written to. If the first address is not the start of a block that
block is not erased.
ERASE_PROGRAM_EEPROM Will erase a block. The lowest address bits are not used.
For chips where getenv("FLASH_ERASE_SIZE") = getenv("FLASH_WRITE_SIZE")
WRITE_PROGRAM_EEPROM Writes 2 bytes, no erase is needed.
WRITE_PROGRAM_MEMORY Writes any number of bytes, bytes outside the range of the write block are
not changed. No erase is needed.
ERASE_PROGRAM_EEPROM Not available.
PSP
These options let to configure and use the Parallel Slave Port on the supported devices.
Relevant Functions:
setup_psp(mode)
psp_output_full()
psp_input_full()
psp_overflow()
Enables/disables the psp port on the chip
Returns 1 if the output buffer is full(waiting to be read by the external bus)
Returns 1 if the input buffer is full(waiting to read by the cpu)
Returns 1 if a write occurred before the previously written byte was read
Relevant Preprocessor:
None
Relevant Interrupts :
INT_PSP
50
Interrupt fires when PSP data is in
Functional Overview
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
PSP
Returns 1 if the device has PSP
Example Code:
while(psp_output_full());
psp_data=command;
while(!input_buffer_full());
if (psp_overflow())
error=true
else
data=psp_data;
//waits till the output buffer is cleared
//writes to the port
//waits till input buffer is cleared
//if there is an overflow set the error flag
//if there is no overflow then read the port
QEI
The Quadrature Encoder Interface (QEI) module provides the interface to incremental encoders for obtaining
mechanical positional data.
Relevant Functions:
setup_qei(options,
filter,maxcount)
qei_status( )
Configures the QEI module.
qei_set_count(value)
Write a 16-bit value to the position counter.
qei_get_count( )
Reads the current 16-bit value of the position counter.
Returns the status of the QUI module.
Relevant Preprocessor:
None
Relevant Interrupts :
#INT_QEI
Interrupt on rollover or underflow of the position counter.
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
int16 Value;
setup_qei(QEI_MODE_X2 |
Setup the QEI module
QEI_TIMER_INTERNAL,
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CCSC_March 2015-1
QEI_FILTER_DIV_2,QEI_FORWARD);
Value = qei_get_count( );
Read the count.
RS232 I/O
These functions and directives can be used for setting up and using RS232 I/O functionality.
Relevant Functions:
getc() or getch()
getchar() or fgetc()
Gets a character on the receive pin(from the specified stream in case of fgetc,
stdin by default). Use KBHIT to check if the character is available.
gets() or fgets()
Gets a string on the receive pin(from the specified stream in case of fgets,
STDIN by default). Use getc to receive each character until return is
encountered.
putc() or putchar() or
fputc()
Puts a character over the transmit pin(on the specified stream in the case of
fputc, stdout by default)
puts() or fputs()
Puts a string over the transmit pin(on the specified stream in the case of fputc,
stdout by default). Uses putc to send each character.
printf() or fprintf()
Prints the formatted string(on the specified stream in the case of fprintf, stdout
by default). Refer to the printf help for details on format string.
kbhit()
Return true when a character is received in the buffer in case of hardware
RS232 or when the first bit is sent on the RCV pin in case of software RS232.
Useful for polling without waiting in getc.
setup_uart(baud,[stream])
or
setup_uart_speed(baud,[stream])
Used to change the baud rate of the hardware UART at run-time. Specifying
stream is optional. Refer to the help for more advanced options.
assert(condition)
Checks the condition and if false prints the file name and line to STDERR. Will
not generate code if #DEFINE NODEBUG is used.
perror(message)
Prints the message and the last system error to STDERR.
putc_send() or fputc_send()
When using transmit buffer, used to transmit data from buffer. See function
description for more detail on when needed.
When using receive buffer, returns the number of bytes in buffer that still need
to be retrieved.
rcv_buffer_bytes()
52
Functional Overview
tx_buffer_bytes()
When using transmit buffer, returns the number of bytes in buffer that still need
to be sent.
tx_buffer_full()
When using transmit buffer, returns TRUE if transmit buffer is full.
receive_buffer_full()
When using receive buffer, returns TRUE if receive buffer is full.
Relevant Interrupts:
INT_RDA
Interrupt fires when the receive data available
INT_TBE
Interrupt fires when the transmit data empty
Some chips have more than one hardware uart, and hence more interrupts.
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
UART
Returns the number of UARTs on this PIC
AUART
Returns true if this UART is an advanced UART
UART_RX
Returns the receive pin for the first UART on this PIC (see PIN_XX)
UART_TX
Returns the transmit pin for the first UART on this PIC
UART2_RX
Returns the receive pin for the second UART on this PIC
UART2_TX
TX – Returns the transmit pin for the second UART on this PIC
Example Code:
/* configure and enable uart, use first hardware UART on PIC */
#use rs232(uart1, baud=9600)
/* print a string */
printf(“enter a character”);
/* get a character */
if (kbhit())
c = getc();
//check if a character has been received
//read character from UART
RTOS
These functions control the operation of the CCS Real Time Operating System (RTOS). This operating system is
cooperatively multitasking and allows for tasks to be scheduled to run at specified time intervals. Because the RTOS
53
CCSC_March 2015-1
does not use interrupts, the user must be careful to make use of the rtos_yield() function in every task so that no one
task is allowed to run forever.
Relevant Functions:
rtos_run()
Begins the operation of the RTOS. All task management tasks are
implemented by this function.
rtos_terminate()
This function terminates the operation of the RTOS and returns operation to
the original program. Works as a return from the rtos_run()function.
rtos_enable(task)
Enables one of the RTOS tasks. Once a task is enabled, the rtos_run()
function will call the task when its time occurs. The parameter to this
function is the name of task to be enabled.
rtos_disable(task)
Disables one of the RTOS tasks. Once a task is disabled, the rtos_run()
function will not call this task until it is enabled using rtos_enable(). The
parameter to this function is the name of the task to be disabled.
rtos_msg_poll()
Returns true if there is data in the task's message queue.
rtos_msg_read()
Returns the next byte of data contained in the task's message queue.
rtos_msg_send(task,byte)
Sends a byte of data to the specified task. The data is placed in the
receiving task's message queue.
rtos_yield()
Called with in one of the RTOS tasks and returns control of the program to
the rtos_run() function. All tasks should call this function when finished.
rtos_signal(sem)
Increments a semaphore which is used to broadcast the availability of a
limited resource.
rtos_wait(sem)
Waits for the resource associated with the semaphore to become available
and then decrements to semaphore to claim the resource.
rtos_await(expre)
Will wait for the given expression to evaluate to true before allowing the
task to continue.
rtos_overrun(task)
Will return true if the given task over ran its alloted time.
rtos_stats(task,stat)
Returns the specified statistic about the specified task. The statistics
include the minimum and maximum times for the task to run and the total
time the task has spent running.
Relevant Preprocessor:
#USE RTOS(options)
#TASK(options)
#TASK
This directive is used to specify several different RTOS attributes including
the timer to use, the minor cycle time and whether or not statistics should
be enabled.
This directive tells the compiler that the following function is to be an RTOS
task.
specifies the rate at which the task should be called, the maximum time the
task shall be allowed to run, and how large it's queue should be
Relevant Interrupts:
none
Relevant Include Files:
none all functions are built in
Relevant getenv() Parameters:
none
Example Code:
#USE
54
// RTOS will use timer zero, minor cycle will be 20ms
Functional Overview
RTOS(timer=0,minor_cycle=20ms)
...
int sem;
...
#TASK(rate=1s,max=20ms,queue=5)
void task_name();
rtos_run();
rtos_terminate();
// Task will run at a rate of once per second
// with a maximum running time of 20ms and
// a 5 byte queue
// begins the RTOS
// ends the RTOS
rtos_enable(task_name);
rtos_disable(task_name);
// enables the previously declared task.
// disables the previously declared task
rtos_msg_send(task_name,5);
rtos_yield();
rtos_sigal(sem);
// places the value 5 in task_names queue.
// yields control to the RTOS
// signals that the resource represented by sem is available.
For more information on the CCS RTOS please
SPI
SPI™ is a fluid standard for 3 or 4 wire, full duplex communications named by Motorola. Most PIC devices support
most common SPI™ modes. CCS provides a support library for taking advantage of both hardware and software
based SPI™ functionality. For software support, see #USE SPI.
Relevant Functions:
setup_spi(mode)
Configure the hardware SPI to the specified mode. The mode configures
setup_spi2(mode)
setup_spi2(mode) thing such as master or slave mode, clock speed and
setup_spi3 (mode)
clock/data trigger configuration.
setup_spi4 (mode)
Note: for devices with dual SPI interfaces a second function, setup_spi2(), is provided to configure the
second interface.
spi_data_is_in()
spi_data_is_in2()
Returns TRUE if the SPI receive buffer has a byte of data.
spi_write(value)
spi_write2(value)
Transmits the value over the SPI interface. This will cause the data to be
clocked out on the SDO pin.
spi_read(value)
spi_read2(value)
Performs an SPI transaction, where the value is clocked out on the SDO pin
and data clocked in on the SDI pin is returned. If you just want to clock in data
then you can use spi_read() without a parameter.
Relevant Preprocessor:
None
Relevant Interrupts:
#int_ssp
#int_ssp2
Relevant getenv() Parameters:
SPI
Transaction (read or write) has completed on the indicated peripheral.
Returns TRUE if the device has an SPI peripheral
Example Code:
//configure the device to be a master, data transmitted on H-to-L clock transition
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);
55
CCSC_March 2015-1
spi_write(0x80);
value=spi_read();
value=spi_read(0x80);
//write 0x80 to SPI device
//read a value from the SPI device
//write 0x80 to SPI device the same time you are reading a value.
Timer0
These options lets the user configure and use timer0. It is available on all devices and is always enabled. The
clock/counter is 8-bit on pic16s and 8 or 16 bit on pic18s. It counts up and also provides interrupt on overflow. The
options available differ and are listed in the device header file.
Relevant Functions:
setup_timer_0(mode)
set_timer0(value) or
set_rtcc(value)
Sets the source, prescale etc for timer0
Initializes the timer0 clock/counter. Value may be a 8 bit or 16 bit depending on
the device.
value=get_timer0
Returns the value of the timer0 clock/counter
Relevant Preprocessor:
None
Relevant Interrupts :
INT_TIMER0 or INT_RTCC
Interrupt fires when timer0 overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMER0
Returns 1 if the device has timer0
Example Code:
For PIC18F452
setup_timer_0(RTCC_INTERNAL
|RTCC_DIV_2|RTCC_8_BIT);
set_timer0(0);
time=get_timer0();
//sets the internal clock as source
//and prescale 2. At 20Mhz timer0
//will increment every 0.4us in this
//setup and overflows every
//102.4us
//this sets timer0 register to 0
//this will read the timer0 register
//value
Timer1
These options lets the user configure and use timer1. The clock/counter is 16-bit on pic16s and pic18s. It counts up
and also provides interrupt on overflow. The options available differ and are listed in the device header file.
Relevant Functions:
setup_timer_1(mode)
set_timer1(value)
value=get_timer1
Relevant Preprocessor:
None
56
Disables or sets the source and prescale for timer1
Initializes the timer1 clock/counter
Returns the value of the timer1 clock/counter
Functional Overview
Relevant Interrupts:
INT_TIMER1
Interrupt fires when timer1 overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMER1
Returns 1 if the device has timer1
Example Code:
For PIC18F452
setup_timer_1(T1_DISABLED);
or
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);
set_timer1(0);
time=get_timer1();
//disables timer1
//sets the internal clock as source
//and prescale as 8. At 20Mhz timer1 will increment
//every 1.6us in this setup and overflows every
//104.896ms
//this sets timer1 register to 0
//this will read the timer1 register value
Timer2
These options lets the user configure and use timer2. The clock/counter is 8-bit on pic16s and pic18s. It counts up
and also provides interrupt on overflow. The options available differ and are listed in the device header file.
Relevant Functions:
setup_timer_2
(mode,period,postscale)
Disables or sets the prescale, period and a postscale for timer2
set_timer2(value)
Initializes the timer2 clock/counter
value=get_timer2
Returns the value of the timer2 clock/counter
Relevant Preprocessor:
None
Relevant Interrupts:
INT_TIMER2
Interrupt fires when timer2 overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMER2
Example Code:
For PIC18F452
setup_timer_2(T2_DISABLED);
or
setup_timer_2(T2_DIV_BY_4,0xc0,2);
set_timer2(0);
time=get_timer2();
Returns 1 if the device has timer2
//disables timer2
//sets the prescale as 4, period as 0xc0 and
//postscales as 2.
//At 20Mhz timer2 will increment every .8us in this
//setup overflows every 154.4us and interrupt every 308.2us
//this sets timer2 register to 0
//this will read the timer1 register value
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CCSC_March 2015-1
Timer3
Timer3 is very similar to timer1. So please refer to the Timer1 section for more details.
Timer4
Timer4 is very similar to Timer2. So please refer to the Timer2 section for more details.
Timer5
These options lets the user configure and use timer5. The clock/counter is 16-bit and is available only on 18Fxx31
devices. It counts up and also provides interrupt on overflow. The options available differ and are listed in the device
header file.
Relevant Functions:
setup_timer_5(mode)
set_timer5(value)
value=get_timer5
Disables or sets the source and prescale for imer5
Initializes the timer5 clock/counter
Returns the value of the timer51 clock/counter
Relevant Preprocessor:
None
Relevant Interrupts :
INT_TIMER5
Interrupt fires when timer5 overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMER5
Returns 1 if the device has timer5
Example Code:
For PIC18F4431
setup_timer_5(T5_DISABLED)
or
setup_timer_5(T5_INTERNAL|T5_DIV_BY_1);
set_timer5(0);
time=get_timer5();
//disables timer5
//sets the internal clock as source and
//prescale as 1.
//At 20Mhz timer5 will increment every .2us in this
//setup and overflows every 13.1072ms
//this sets timer5 register to 0
//this will read the timer5 register value
TimerA
These options lets the user configure and use timerA. It is available on devices with Timer A hardware. The
clock/counter is 8 bit. It counts up and also provides interrupt on overflow. The options available are listed in the
device's header file.
Relevant Functions:
setup_timer_A(mode)
58
Disable or sets the source and prescale for timerA
Functional Overview
set_timerA(value)
value=get_timerA()
Initializes the timerA clock/counter
Returns the value of the timerA clock/counter
Relevant Preprocessor:
None
Relevant Interrupts :
INT_TIMERA
Interrupt fires when timerA overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMERA
Returns 1 if the device has timerA
Example Code:
setup_timer_A(TA_OFF);
or
setup_timer_A
(TA_INTERNAL | TA_DIV_8);
//disable timerA
//sets the internal clock as source
//and prescale as 8. At 20MHz timerA will increment
//every 1.6us in this setup and overflows every
//409.6us
set_timerA(0);
time=get_timerA();
//this sets timerA register to 0
//this will read the timerA register value
TimerB
These options lets the user configure and use timerB. It is available on devices with TimerB hardware. The
clock/counter is 8 bit. It counts up and also provides interrupt on overflow. The options available are listed in the
device's header file.
Relevant Functions:
setup_timer_B(mode)
set_timerB(value)
value=get_timerB()
Disable or sets the source and prescale for timerB
Initializes the timerB clock/counter
Returns the value of the timerB clock/counter
Relevant Preprocessor:
None
Relevant Interrupts :
INT_TIMERB
Interrupt fires when timerB overflows
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMERB
Returns 1 if the device has timerB
Example Code:
setup_timer_B(TB_OFF);
//disable timerB
or
setup_timer_B
(TB_INTERNAL | TB_DIV_8);
set_timerB(0);
time=get_timerB();
//sets the internal clock as source
//and prescale as 8. At 20MHz timerB will increment
//every 1.6us in this setup and overflows every
//409.6us
//this sets timerB register to 0
//this will read the timerB register value
59
CCSC_March 2015-1
USB
Universal Serial Bus, or USB, is used as a method for peripheral devices to connect to and talk to a personal
computer. CCS provides libraries for interfacing a PIC to PC using USB by using a PIC with an internal USB
peripheral (like the PIC16C765 or the PIC18F4550 family) or by using any PIC with an external USB peripheral (the
National USBN9603 family).
Relevant Functions:
usb_init()
Initializes the USB hardware. Will then wait in an infinite loop for the USB peripheral to
be connected to bus (but that doesn't mean it has been enumerated by the PC). Will
enable and use the USB interrupt.
usb_init_cs()
The same as usb_init(), but does not wait for the device to be connected to the bus.
This is useful if your device is not bus powered and can operate without a USB
connection.
usb_task()
If you use connection sense, and the usb_init_cs() for initialization, then you must
periodically call this function to keep an eye on the connection sense pin. When the
PIC is connected to the BUS, this function will then perpare the USB peripheral. When
the PIC is disconnected from the BUS, it will reset the USB stack and peripheral. Will
enable and use the USB interrupt.
Note: In your application you must define USB_CON_SENSE_PIN to the connection sense pin.
usb_detach()
Removes the PIC from the bus. Will be called automatically by usb_task() if connection
is lost, but can be called manually by the user.
usb_attach()
Attaches the PIC to the bus. Will be called automatically by usb_task() if connection is
made, but can be called manually by the user.
usb_attached()
If using connection sense pin (USB_CON_SENSE_PIN), returns TRUE if that pin is
high. Else will always return TRUE.
usb_enumerated()
Returns TRUE if the device has been enumerated by the PC. If the device has been
enumerated by the PC, that means it is in normal operation mode and you can
send/receive packets.
usb_put_packet
(endpoint, data, len, tgl)
Places the packet of data into the specified endpoint buffer. Returns TRUE if success,
FALSE if the buffer is still full with the last packet.
usb_puts
(endpoint, data, len,
timeout)
Sends the following data to the specified endpoint. usb_puts() differs from
usb_put_packet() in that it will send multi packet messages if the data will not fit into
one packet.
usb_kbhit(endpoint)
Returns TRUE if the specified endpoint has data in it's receive buffer
usb_get_packet
(endpoint, ptr, max)
Reads up to max bytes from the specified endpoint buffer and saves it to the pointer
ptr. Returns the number of bytes saved to ptr.
usb_gets(endpoint, ptr,
max, timeout)
Reads a message from the specified endpoint. The difference usb_get_packet() and
usb_gets() is that usb_gets() will wait until a full message has received, which a
message may contain more than one packet. Returns the number of bytes received.
Relevant CDC Functions:
A CDC USB device will emulate an RS-232 device, and will appear on your PC as a COM port. The follow
functions provide you this virtual RS-232/serial interface
Note: When using the CDC library, you can use the same functions above, but do not use the packet related
60
Functional Overview
function such as
usb_kbhit(), usb_get_packet(), etc.
usb_cdc_kbhit()
The same as kbhit(), returns TRUE if there is 1 or more character in the
receive buffer.
usb_cdc_getc()
The same as getc(), reads and returns a character from the receive buffer. If there is no
data in the receive buffer it will wait indefinitely until there a character has been
received.
usb_cdc_putc(c)
The same as putc(), sends a character. It actually puts a character into the transmit
buffer, and if the transmit buffer is full will wait indefinitely until there is space for the
character.
usb_cdc_putc_fast(c)
The same as usb_cdc_putc(), but will not wait indefinitely until there is space for the
character in the transmit buffer. In that situation the character is lost.
usb_cdc_puts(*str)
Sends a character string (null terminated) to the USB CDC port. Will return FALSE if
the buffer is busy, TRUE if buffer is string was put into buffer for sending. Entire string
must fit into endpoint, if string is longer than endpoint buffer then excess characters will
be ignored.
usb_cdc_putready()
Returns TRUE if there is space in the transmit buffer for another character.
Relevant Preporcessor:
None
Relevant Interrupts:
#int_usb
Relevant Include files:
pic_usb.h
A USB event has happened, and requires application intervention. The USB library that
CCS provides handles this interrupt automatically.
Hardware layer driver for the PIC16C765 family PICmicro controllers with an internal
USB peripheral.
pic18_usb.h
Hardware layer driver for the PIC18F4550 family PICmicro controllers with an internal
USB peripheral.
usbn960x.h
Hardware layer driver for the National USBN9603/USBN9604 external USB peripheral.
You can use this external peripheral to add USB to any microcontroller.
usb.h
Common definitions and prototypes used by the USB driver
usb.c
The USB stack, which handles the USB interrupt and USB Setup Requests on
Endpoint 0.
usb_cdc.h
A driver that takes the previous include files to make a CDC USB device, which
emulates an RS232 legacy device and shows up as a COM port in the MS Windows
device manager.
Relevant getenv() Parameters:
USB
Returns TRUE if the PICmicro controller has an integrated internal USB peripheral.
Example Code:
Due to the complexity of USB example code will not fit here. But you can find the following examples
installed with your CCS C Compiler:
ex_usb_hid.c
ex_usb_mouse.c
A simple HID device
A HID Mouse, when connected to your PC the mouse cursor will go in circles.
ex_usb_kbmouse.c
An example of how to create a USB device with multiple interfaces by creating a
keyboard and mouse in one device.
61
CCSC_March 2015-1
ex_usb_kbmouse2.c
An example of how to use multiple HID report Ids to transmit more than one type of HID
packet, as demonstrated by a keyboard and mouse on one device.
ex_usb_scope.c
A vendor-specific class using bulk transfers is demonstrated.
ex_usb_serial.c
The CDC virtual RS232 library is demonstrated with this RS232 < - > USB example.
ex_usb_serial2.c
Another CDC virtual RS232 library example, this time a port of the ex_intee.c example
to use USB instead of RS232.
Voltage Reference
These functions configure the votlage reference module. These are available only in the supported chips.
Relevant Functions:
setup_vref(mode | value)
Enables and sets up the internal voltage
reference value. Constants are defined in the
device's .h file.
Relevant Preprocesser:
none
Relevant Interrupts:
none
Relevant Include Files:
none, all functions built-in
Relevant getenv() parameters:
VREF
Example code:
for PIC12F675
#INT_COMP //comparator interrupt handler
void isr() {
safe_conditions = FALSE;
printf("WARNING!!!! Voltage level is above
3.6V. \r\n");
}
setup_comparator(A1_VR_OUT_ON_A2)//sets
2 comparators(A1 and VR and A2 as output)
{
setup_vref(VREF_HIGH | 15);//sets 3.6(vdd
* value/32 + vdd/4) if vdd is 5.0V
enable_interrupts(INT_COMP); // enable
the comparator interrupt
62
Returns 1 if the device has VREF
Functional Overview
enable_interrupts(GLOBAL); //enable
global interrupts
}
WDT or Watch Dog Timer
Different chips provide different options to enable/disable or configure the WDT.
Relevant Functions:
setup_wdt()
restart_wdt()
Enables/disables the wdt or sets the prescalar.
Restarts the wdt, if wdt is enables this must be periodically called to prevent a
timeout reset.
For PCB/PCM chips it is enabled/disabled using WDT or NOWDT fuses whereas on PCH device it is done
using the setup_wdt function.
The timeout time for PCB/PCM chips are set using the setup_wdt function and on PCH using fuses like
WDT16, WDT256 etc.
RESTART_WDT when specified in #USE DELAY, #USE I2C and #USE RS232 statements like this #USE
DELAY(clock=20000000, restart_wdt) will cause the wdt to restart if it times out during the delay or I2C_READ
or GETC.
Relevant Preprocessor:
#FUSES WDT/NOWDT
#FUSES WDT16
Enabled/Disables wdt in PCB/PCM devices
Sets ups the timeout time in PCH devices
Relevant Interrupts:
None
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
None
Example Code:
For PIC16F877
#fuses wdt
setup_wdt(WDT_2304MS);
while(true){
restart_wdt();
perform_activity();
}
For PIC18F452
#fuse WDT1
setup_wdt(WDT_ON);
while(true){
restart_wdt();
perform_activity();
}
Some of the PCB chips are share the WDT prescalar bits with timer0 so the WDT prescalar constants can be
used with setup_counters or setup_timer0 or setup_wdt functions.
63
CCSC_March 2015-1
interrupt_enabled()
This function checks the interrupt enabled flag for the specified interrupt and returns
TRUE if set.
Syntax
interrupt_enabled(interrupt);
Parameters
Returns
Function
interrupt- constant specifying the interrupt
Boolean value
The function checks the interrupt enable flag of the specified interrupt and
returns TRUE when set.
Devices with interrupts
Interrupt constants defined in the device's .h file.
if(interrupt_enabled(INT_RDA))
disable_interrupt(INT_RDA);
None
DISABLE_INTERRUPTS(), , Interrupts Overview,
CLEAR_INTERRUPT(),
ENABLE_INTERRUPTS(),,INTERRUPT_ACTIVE()
Availability
Requires
Examples
Example Files
Also see
Stream I/O
Syntax:
#include <ios.h> is required to use any of the ios identifiers.
Output:
output:
stream << variable_or_constant_or_manipulator ;
________________________________
one or more repeats
stream may be the name specified in the #use RS232 stream= option
or for the default stream use cout.
stream may also be the name of a char array. In this case the data is
written to the array with a 0 terminator.
stream may also be the name of a function that accepts a single char
parameter. In this case the function is called for each character to be output.
variables/constants: May be any integer, char, float or fixed type. Char arrays are
output as strings and all other types are output as an address of the variable.
manipulators:
hex -Hex format numbers
dec- Decimal format numbers (default)
setprecision(x) -Set number of places after the decimal point
setw(x) -Set total number of characters output for numbers
boolalpha- Output int1 as true and false
noboolalpha -Output int1 as 1 and 0 (default)
fixed Floats- in decimal format (default)
scientific Floats- use E notation
iosdefault- All manipulators to default settings
endl -Output CR/LF
ends- Outputs a null ('\000')
Examples:
64
cout << "Value is " << hex << data << endl;
cout << "Price is $" << setw(4) << setprecision(2) << cost << endl;
lcdputc << '\f' << setw(3) << count << " " << min << " " << max;
string1 << setprecision(1) << sum / count;
Functional Overview
string2 << x << ',' << y;
Input:
stream >> variable_or_constant_or_manipulator ;
________________________________
one or more repeats
stream may be the name specified in the #use RS232 stream= option
or for the default stream use cin.
stream may also be the name of a char array. In this case the data is
read from the array up to the 0 terminator.
stream may also be the name of a function that returns a single char and has
no parameters. In this case the function is called for each character to be input.
Make sure the function returns a \r to terminate the input statement.
variables/constants: May be any integer, char, float or fixed type. Char arrays are
input as strings. Floats may use the E format.
Reading of each item terminates with any character not valid for the type. Usually
items are separated by spaces. The termination character is discarded. At the end
of any stream input statement characters are read until a return (\r) is read. No
termination character is read for a single char input.
Examples:
manipulators:
hex -Hex format numbers
dec- Decimal format numbers (default)
noecho- Suppress echoing
strspace- Allow spaces to be input into strings
nostrspace- Spaces terminate string entry (default)
iosdefault -All manipulators to default settings
cout << "Enter number: ";
cin >> value;
cout << "Enter title: ";
cin >> strspace >> title;
cin >> data[i].recordid >> data[i].xpos >> data[i].ypos >> data[i].sample ;
string1 >> data;
lcdputc << "\fEnter count";
lcdputc << keypadgetc >> count; // read from keypad, echo to lcd
// This syntax only works with
// user defined functions.
65
PREPROCESSOR
PRE-PROCESSOR DIRECTORY
Pre-processor directives all begin with a # and are followed by a specific command. Syntax is dependent on the
command. Many commands do not allow other syntactical elements on the remainder of the line. A table of
commands and a description is listed on the previous page.
Several of the pre-processor directives are extensions to standard C. C provides a pre-processor directive that
compilers will accept and ignore or act upon the following data. This implementation will allow any pre-processor
directives to begin with #PRAGMA. To be compatible with other compilers, this may be used before non-standard
features.
Examples:
Both of the following are valid
#INLINE
#PRAGMA INLINE
Standard C
Function
Qualifier
Pre-Defined
Identifier
RTOS
Device
Specification
Built-in
Libraries
Memory
Control
#IF expr
#IFDEF
#IFNDEF
#ELSE
#ELIF
#DEFINE
#UNDEF
#INCLUDE
#WARNING
#ENDIF
#LIST
#NOLIST
#PRAGMA
#ERROR
DEFINEDINC
#INLINE
#SEPARATE
#INT_xxxx
#INT_DEFAULT
#INT_GLOBAL
a
__DATE_ _
__DEVICE_ _
__FILE_ _
__ADDRESS__
__BUILDCOUNT__
__LINE_ _
__FILENAME_ _
__TIME__
__UNICODE__
#TASK
#USE RTOS
#DEVICE chip
#ID "filename"
#HEXCOMMENT
#FUSES
#SERIALIZE
#ID number
#PIN_SELECT
#ID CHECKSUM
a
#USE DELAY
#USE FAST_IO
#USE SPI
#USE CAPTURE
#USE FIXED_IO
#USE I2C
#USE TOUCHPAD
#USE PWM
#USE RS232
#USE STANDARD_IO
#USE TIMER
#USE PROFILE
#ASM
#BIT
#ENDASM
#FILL_ROM
__PCH_ _
__PCM_ _
__PCB_ _
#ROM
#TYPE
#USE DYNAMIC_MEMORY #LOCATE
#ZERO_RAM
#LINE
#ORG
#WORD
#RESERVE
#BYTE
66
PreProcessor
Compiler
Control
Linker
#CASE
#EXPORT
#IGNORE_WARNINGS
#IMPORT
#OPT
#MODULE
#PRIORITY
#OCS
#PROFILE
#IMPORT
#EXPORT
#BUILD
__address__
A predefined symbol __address__ may be used to indicate a type that must
hold a program memory address.
For example:
___address__ testa = 0x1000
//will allocate 16 bits for test a and
//initialize to 0x1000
_attribute_x
Syntax:
Elements:
__attribute__x
x is the attribute you want to apply. Valid values for x are as follows:
((packed))
By default each element in a struct or union are padded to be evenly spaced by the
size of 'int'. This is to prevent an address fault when accessing an element of struct.
See the following example:
struct
{
int8 a;
int16 b;
} test;
On architectures where 'int' is 16bit (such as dsPIC or PIC24 PICmicrocontrollers),
'test' would take 4 bytes even though it is comprised of3 bytes. By applying the
'packed' attribute to this struct then it would take 3 bytes as originally intended:
struct __attribute__((packed))
{
int8 a;
int16 b;
} test;
Care should be taken by the user when accessing individual elements of a packed
struct – creating a pointer to 'b' in 'test' and attempting to dereference that pointer
would cause an address fault. Any attempts to read/write 'b' should be done in
context of 'test' so the compiler knows it is packed:
test.b = 5;
((aligned(y))
By default the compiler will alocate a variable in the first free memory location. The
67
CCSC_March 2015-1
Purpose
Examples:
Example Files:
aligned attribute will force the compiler to allocate a location for the specified variable
at a location that is modulus of the y parameter. For example:
int8 array[256] __attribute__((aligned(0x1000)));
This will tell the compiler to try to place 'array' at either 0x0, 0x1000, 0x2000, 0x3000,
0x4000, etc.
To alter some specifics as to how the compiler operates
struct __attribute__((packed))
{
int8 a;
int8 b;
} test;
int8 array[256] __attribute__((aligned(0x1000)));
None
#asm #endasm #asm asis
Syntax:
#ASM or #ASM ASIS code #ENDASM
Elements:
code is a list of assembly language instructions
Examples:
int find_parity(int data){
int count;
#asm
MOV #0x08, W0
MOV W0, count
CLR W0
loop:
XOR.B data,W0
RRC data,W0
DEC count,F
BRA NZ, loop
MOV #0x01,W0
ADD count,F
MOV count, W0
MOV W0. _RETURN_
#endasm
}
Example Files:
ex_glint.c
Also See:
None
12 Bit and 14 Bit
ADDWF f,d
CLRF f
COMF f,d
DECFSZ f,d
INCFSZ f,d
MOVF f,d
68
ANDWF f,d
CLRW
DECF f,d
INCF f,d
IORWF f,d
MOVPHW
PreProcessor
MOVPLW
NOP
RRF f,d
SWAPF f,d
BCF f,b
BTFSC f,b
ANDLW k
CLRWDT
IORLW k
RETLW k
XORLW
TRIS k
MOVWF f
RLF f,d
SUBWF f,d
XORWF f,d
BSF f,b
BTFSS f,b
CALL k
GOTO k
MOVLW k
SLEEP
OPTION
14 Bit
ADDLW k
SUBLW k
RETFIE
RETURN
f
d
f,b
k
may be a constant (file number) or a simple variable
may be a constant (0 or 1) or W or F
may be a file (as above) and a constant (0-7) or it may be just a bit variable reference.
may be a constant expression
Note that all expressions and comments are in C like syntax.
PIC 18
ADDWF
CLRF
CPFSGT
DECFSZ
INFSNZ
MOVFF
NEGF
RRCF
SUBFWB
SWAPF
BCF
BTFSS
BN
BNOV
BRA
CLRWDT
NOP
PUSH
RETFIE
SLEEP
IORLW
MOVLW
SUBLW
TBLRD
TBLWT
TBLWT
f,d
f
f
f,d
f,d
fs,d
f
f,d
f,d
f,d
f,b
f,b
n
n
n
s
k
k
k
*+
*
+*
ADDWFC
COMF
CPFSLT
DCFSNZ
IORWF
MOVWF
RLCF
RRNCF
SUBWF
TSTFSZ
BSF
BTG
BNC
BNZ
BZ
DAW
NOP
RCALL
RETLW
ADDLW
LFSR
MULLW
XORLW
TBLRD
TBLWT
f,d
f,d
f
f,d
f,d
f
f,d
f,d
f,d
f
f,b
f,d
n
n
n
n
k
k
f,k
k
k
**+
ANDWF
CPFSEQ
DECF
INCF
MOVF
MULWF
RLNCF
SETF
SUBWFB
XORWF
BTFSC
BC
BNN
BOV
CALL
GOTO
POP
RESET
RETURN
ANDLW
MOVLB
RETLW
TBLRD
TBLRD
TBLWT
f,d
f
f,d
f,d
f,d
f
f,d
f
f,d
f,d
f,b
n
n
n
n,s
n
s
k
k
k
*
+*
*-
The compiler will set the access bit depending on the value of the file register.
If there is just a variable identifier in the #asm block then the compiler inserts an &
before it. And if it is an expression it must be a valid C expression that evaluates
to a constant (no & here). In C an un-subscripted array name is a pointer and a
constant (no need for &).
69
CCSC_March 2015-1
#bit
Syntax:
#BIT id = x.y
Elements:
id is a valid C identifier,
x is a constant or a C variable,
y is a constant 0-7
Purpose:
A new C variable (one bit) is created and is placed in memory at byte x and bit y. This is useful to gain
access in C directly to a bit in the processors special function register map. It may also be used to easily
access a bit of a standard C variable.
Examples:
#bit T0IF = 0x b.2
...
T1IF = 0; // Clear Timer 0 interrupt flag
int result;
#bit result_odd = result.0
...
if (result_odd)
Example
Files:
ex_glint.c
Also See:
#BYTE, #RESERVE, #LOCATE, #WORD
__buildcount__
Only defined if Options>Project Options>Global Defines has global defines
enabled.
This id resolves to a number representing the number of successful builds of
the project.
#build
Syntax:
Elements:
#BUILD(segment = address)
#BUILD(segment = address, segment = address)
#BUILD(segment = start:end)
#BUILD(segment = start: end, segment = start: end)
#BUILD(nosleep)
segment is one of the following memory segments which may be assigned a location: MEMORY, RESET, or
INTERRUPT
address is a ROM location memory address. Start and end are used to specify a range in memory to be
70
PreProcessor
used.
start is the first ROM location and end is the last ROM location to be used.
nosleep is used to prevent the compiler from inserting a sleep at the end of main()
Bootload produces a bootloader-friendly hex file (in order, full block size).
NOSLEEP_LOCK is used instead of A sleep at the end of a main A infinite loop.
Purpose:
PIC18XXX devices with external ROM or PIC18XXX devices with no internal ROM can direct the compiler to
utilize the ROM. When linking multiple compilation units, this directive must appear exactly the same in each
compilation unit.
Examples:
#build(memory=0x20000:0x2FFFF)
//Assigns memory space
#build(reset=0x200,interrupt=0x208) //Assigns start
//location
//of reset and
//interrupt
//vectors
#build(reset=0x200:0x207, interrupt=0x208:0x2ff)
//Assign limited space
//for reset and
//interrupt vectors.
#build(memory=0x20000:0x2FFFF)
//Assigns memory space
Example
Files:
Also See:
None
#LOCATE, #RESERVE, #ROM, #ORG
#byte
Syntax:
#byte id = x
Elements:
id is a valid C identifier,
x is a C variable or a constant
Purpose:
If the id is already known as a C variable then this will locate the variable at address x. In this case the
variable type does not change from the original definition. If the id is not known a new C variable is created
and placed at address x with the type int (8 bit)
Warning: In both cases memory at x is not exclusive to this variable. Other variables may be located at the
same location. In fact when x is a variable, then id and x share the same memory location.
Examples:
#byte
#byte
status = 3
b_port = 6
struct {
short int r_w;
short int c_d;
int unused : 2;
int data
: 4 ; } a _port;
#byte a_port = 5
...
a_port.c_d = 1;
Example
Files:
Also See:
ex_glint.c
#bit, #locate, #reserve, #word, Named Registers, Type Specifiers, Type Qualifiers, Enumerated Types,
Structures & Unions, Typedef
71
CCSC_March 2015-1
#case
Syntax:
#CASE
Elements:
None
Purpose:
Will cause the compiler to be case sensitive. By default the compiler is case insensitive. When linking
multiple compilation units, this directive must appear exactly the same in each compilation unit.
Warning: Not all the CCS example programs, headers and drivers have been tested with case sensitivity
turned on.
Examples:
#case
int STATUS;
void func() {
int status;
...
STATUS = status; // Copy local status to
//global
}
Example
Files:
Also See:
ex_cust.c
None
_date_
Syntax:
__DATE__
Elements:
None
Purpose:
This pre-processor identifier is replaced at compile time with the date of the compile in the form: "31-JAN-03"
Examples:
printf("Software was compiled on ");
printf(__DATE__);
Example
Files:
Also See:
None
None
#define
Syntax:
#define id text
or
#define id(x,y...) text
Elements:
id is a preprocessor identifier, text is any text, x,y is a list of local preprocessor identifiers, and in this form
there may be one or more identifiers separated by commas.
72
PreProcessor
Purpose:
Used to provide a simple string replacement of the ID with the given text from this point of the program and
on.
In the second form (a C macro) the local identifiers are matched up with similar identifiers in the text and they
are replaced with text passed to the macro where it is used.
If the text contains a string of the form #idx then the result upon evaluation will be the parameter id
concatenated with the string x.
If the text contains a string of the form #idx#idy then parameter idx is concatenated with parameter idy
forming a new identifier.
Within the define text two special operators are supported:
#x is the stringize operator resulting in "x"
x##y is the concatination operator resulting in xy
The varadic macro syntax is supported where the last parameter is specified as ... and the local identifier
used is __va_args__. In this case, all remaining arguments are combined with the commas.
Examples:
#define BITS 8
a=a+BITS;
//same as
a=a+8;
#define hi(x) (x<<4)
a=hi(a);
//same as
a=(a<<4);
#define isequal(a,b)
(primary_##a[b]==backup_##a[b])
// usage iseaqual(names,5) is the same as
// (primary_names[5]==backup_names[5])
#define str(s) #s
#define part(device) #include str(device##.h)
// usage part(16F887) is the same as
// #include "16F887.h"
#define DBG(...)
Example
Files:
Also See:
fprintf(debug,__VA_ARGS__)
ex_stwt.c, ex_macro.c
#UNDEF, #IFDEF, #IFNDEF
definedinc
Syntax:
value = definedinc( variable );
Parameters:
variable is the name of the variable, function, or type to be checked.
Returns:
A C status for the type of id entered as follows:
0 – not known
1 – typedef or enum
2 – struct or union type
3 – typemod qualifier
4 – defined function
5 – function prototype
6 – compiler built-in function
7 – local variable
8 – global variable
73
CCSC_March 2015-1
Function:
This function checks the type of the variable or function being passed in and returns a specific C
status based on the type.
Availability:
Requires:
Examples:
All devices
None.
int x, y = 0;
y = definedinc( x );
Example Files:
None
Also See:
None
// y will return 7 – x is a local variable
#device
Syntax:
#DEVICE chip options
#DEVICE Compilation mode selection
Elements:
Chip Options-
chip is the name of a specific processor (like: PIC16C74 ), To get a current list of supported devices:
START | RUN | CCSC +Q
Options are qualifiers to the standard operation of the device. Valid options are:
*=5
Use 5 bit pointers (for all parts)
*=8
Use 8 bit pointers (14 and 16 bit parts)
*=16
Use 16 bit pointers (for 14 bit parts)
ADC=x
Where x is the number of bits read_adc() should return
ICD=TRUE
Generates code compatible with Microchips ICD debugging
hardware.
ICD=n
For chips with multiple ICSP ports specify the port number
being used. The default is 1.
WRITE_EEPROM=ASYNC
Prevents WRITE_EEPROM from hanging while writing is
taking place. When used, do not write to EEPROM from both
ISR and outside ISR.
WRITE_EEPROM = NOINT
Allows interrupts to occur while the write_eeprom() operations
is polling the done bit to check if the write operations has
completed. Can be used as long as no EEPROM operations
are performed during an ISR.
HIGH_INTS=TRUE
Use this option for high/low priority interrupts on the PIC® 18.
%f=.
No 0 before a decimal pint on %f numbers less than 1.
OVERLOAD=KEYWORD
Overloading of functions is now supported. Requires the use
of the keyword for overloading.
OVERLOAD=AUTO
Default mode for overloading.
PASS_STRINGS=IN_RAM
A new way to pass constant strings to a function by first
copying the string to RAM and then passing a pointer to RAM
to the function.
CONST=READ_ONLY
Uses the ANSI keyword CONST definition, making CONST
variables read only, rather than located in program memory.
CONST=ROM
Uses the CCS compiler traditional keyword CONST definition,
making CONST variables located in program memory.
NESTED_INTERRUPTS=TRUE
Enables interrupt nesting for PIC24, dsPIC30, and dsPIC33
74
PreProcessor
NORETFIE
NO_DIGITAL_INIT
devices. Allows higher priority interrupts to interrupt lower
priority interrupts.
ISR functions (preceeded by a #int_xxx) will use a RETURN
opcode instead of the RETFIE opcode. This is not a
commonly used option; used rarely in cases where the user is
writing their own ISR handler.
Normally the compiler sets all I/O pins to digital and turns off
the comparator. This option prevents that action.
Both chip and options are optional, so multiple #DEVICE lines may be used to fully define the device. Be
warned that a #DEVICE with a chip identifier, will clear all previous #DEVICE and #FUSE settings.
Compilation mode selectionThe #DEVICE directive supports compilation mode selection. The valid keywords are CCS2, CCS3, CCS4 and
ANSI. The default mode is CCS4. For the CCS4 and ANSI mode, the compiler uses the default fuse settings
NOLVP, PUT for chips with these fuses. The NOWDT fuse is default if no call is made to restart_wdt().
CCS4
This is the default compilation mode. The pointer size in this mode for PCM and PCH is
set to *=16 if the part has RAM over 0FF.
ANSI
Default data type is SIGNED all other modes default is UNSIGNED. Compilation is case
sensitive, all other modes are case insensitive. Pointer size is set to *=16 if the part has RAM
over 0FF.
CCS2
CCS3
var16 = NegConst8 is compiled as: var16 = NegConst8 & 0xff (no sign extension) Pointer size is
set to *=8 for PCM and PCH and *=5 for PCB . The overload keyword is required.
CCS2
only
The default #DEVICE ADC is set to the resolution of the part, all other modes default to 8.
onebit = eightbits is compiled as onebit = (eightbits != 0)
All other modes compile as: onebit = (eightbits & 1)
Purpose:
Chip Options -Defines the target processor. Every program must have exactly one #DEVICE with a chip.
When linking multiple compilation units, this directive must appear exactly the same in each compilation unit.
Compilation mode selection - The compilation mode selection allows existing code to be compiled without
encountering errors created by compiler compliance. As CCS discovers discrepancies in the way expressions
are evaluated according to ANSI, the change will generally be made only to the ANSI mode and the next
major CCS release.
Examples:
Chip Options#device PIC16C74
#device PIC16C67 *=16
#device *=16 ICD=TRUE
#device PIC16F877 *=16 ADC=10
#device %f=.
printf("%f",.5); //will print .5, without the directive it will print 0.5
Compilation mode selection#device CCS2
Example
Files:
Also See:
// This will set the ADC to the resolution of the part
ex_mxram.c , ex_icd.c , 16c74.h ,
read_adc()
75
CCSC_March 2015-1
_device_
Syntax:
__DEVICE__
Elements:
None
Purpose:
This pre-processor identifier is defined by the compiler with the base number of the current device (from a
#DEVICE). The base number is usually the number after the C in the part number. For example the
PIC16C622 has a base number of 622.
Examples:
#if __device__==71
SETUP_ADC_PORTS( ALL_DIGITAL );
#endif
Example
Files:
Also See:
None
#DEVICE
#if expr #else #elif #endif
Syntax:
#if expr
code
#elif expr //Optional, any number may be used
code
#else
//Optional
code
#endif
Elements:
expr is an expression with constants, standard operators and/or preprocessor identifiers. Code is
any standard c source code.
Purpose:
The pre-processor evaluates the constant expression and if it is non-zero will process the lines up
to the optional #ELSE or the #ENDIF.
Note: you may NOT use C variables in the #IF. Only preprocessor identifiers created via #define
can be used.
The preprocessor expression DEFINED(id) may be used to return 1 if the id is defined and 0 if it
is not.
== and != operators now accept a constant string as both operands. This allows for compile time
comparisons and can be used with GETENV() when it returns a string result.
Examples:
#if MAX_VALUE > 255
long value;
#else
int value;
#endif
#if getenv(“DEVICE”)==”PIC16F877”
//do something special for the PIC16F877
#endif
Example Files:
ex_extee.c
Also See:
#IFDEF, #IFNDEF, getenv()
76
PreProcessor
#error
Syntax:
#ERROR text
#ERROR / warning text
#ERROR / information text
text is optional and may be any text
Elements:
Purpose:
Forces the compiler to generate an error at the location this directive appears in the
file. The text may include macros that will be expanded for the display. This may be
used to see the macro expansion. The command may also be used to alert the user to
an invalid compile time situation.
Examples:
#if BUFFER_SIZE>16
#error Buffer size is too large
#endif
#error
Macro test: min(x,y)
Example Files:
ex_psp.c
Also See:
#WARNING
#export (options)
Syntax:
#EXPORT (options)
Elements:
FILE=filname
The filename which will be generated upon compile. If not given, the filname will be the name of the file you
are compiling, with a .o or .hex extension (depending on output format).
ONLY=symbol+symbol+.....+symbol
Only the listed symbols will be visible to modules that import or link this relocatable object file. If neither
ONLY or EXCEPT is used, all symbols are exported.
EXCEPT=symbol+symbol+.....+symbol
All symbols except the listed symbols will be visible to modules that import or link this relocatable object file. If
neither ONLY or EXCEPT is used, all symbols are exported.
RELOCATABLE
CCS relocatable object file format. Must be imported or linked before loading into a PIC. This is the default
format when the #EXPORT is used.
HEX
Intel HEX file format. Ready to be loaded into a PIC. This is the default format when no #EXPORT is used.
RANGE=start:stop
Only addresses in this range are included in the hex file.
OFFSET=address
Hex file address starts at this address (0 by default)
ODD
Only odd bytes place in hex file.
77
CCSC_March 2015-1
EVEN
Only even bytes placed in hex file.
Purpose:
This directive will tell the compiler to either generate a relocatable object file or a stand-alone HEX binary. A
relocatable object file must be linked into your application, while a stand-alone HEX binary can be
programmed directly into the PIC.
The command line compiler and the PCW IDE Project Manager can also be used to compile/link/build
modules and/or projects.
Multiple #EXPORT directives may be used to generate multiple hex files. this may be used for 8722 like
devices with external memory.
Examples:
#EXPORT(RELOCATABLE, ONLY=TimerTask)
void TimerFunc1(void) { /* some code */ }
void TimerFunc2(void) { /* some code */ }
void TimerFunc3(void) { /* some code */ }
void TimerTask(void)
{
TimerFunc1();
TimerFunc2();
TimerFunc3();
}
/*
This source will be compiled into a relocatable object, but the object this is being linked
to can only see TimerTask()
*/
Example
Files:
See Also:
None
#IMPORT, #MODULE, Invoking the Command Line Compiler, Multiple Compilation Unit
__file__
Syntax:
__FILE__
Elements:
None
Purpose:
The pre-processor identifier is replaced at compile time with the file path and the filename
of the file being compiled.
Examples:
if(index>MAX_ENTRIES)
printf("Too many entries, source file: "
__FILE__ " at line " __LINE__ "\r\n");
Example Files:
assert.h
Also See:
_ _ line_ _
__filename__
Syntax:
78
__FILENAME__
PreProcessor
Elements:
None
Purpose:
The pre-processor identifier is replaced at compile time with the filename of the file being
compiled.
Examples:
if(index>MAX_ENTRIES)
printf("Too many entries, source file: "
__FILENAME__ " at line " __LINE__ "\r\n");
Example Files:
None
Also See:
_ _ line_ _
#fill_rom
Syntax:
#fill_rom value
Elements:
value is a constant 16-bit value
Purpose:
This directive specifies the data to be used to fill unused ROM locations. When linking multiple compilation
units, this directive must appear exactly the same in each compilation unit.
Examples:
#fill_rom 0x36
Example
Files:
Also See:
None
#ROM
#fuses
Syntax:
#FUSES options
Elements:
options vary depending on the device. A list of all valid options has been put at the top of each devices .h
file in a comment for reference. The PCW device edit utility can modify a particular devices fuses. The PCW
pull down menu VIEW | Valid fuses will show all fuses with their descriptions.
Some common options are:
 LP, XT, HS, RC
 WDT, NOWDT
 PROTECT, NOPROTECT
 PUT, NOPUT (Power Up Timer)
 BROWNOUT, NOBROWNOUT
Purpose:
This directive defines what fuses should be set in the part when it is programmed. This directive does not
affect the compilation; however, the information is put in the output files. If the fuses need to be in Parallax
format, add a PAR option. SWAP has the special function of swapping (from the Microchip standard) the
high and low BYTES of non-program data in the Hex file. This is required for some device programmers.
Some fuses are set by the compiler based on other compiler directives. For example, the oscillator fuses are
set up by the #USE delay directive. The debug, No debug and ICSPN Fuses are set by the #DEVICE
ICD=directive.
79
CCSC_March 2015-1
Some processors allow different levels for certain fuses. To access these levels, assign a value to the fuse.
For example, on the 18F452, the fuse PROTECT=6 would place the value 6 into CONFIG5L, protecting code
blocks 0 and 3.
When linking multiple compilation units be aware this directive applies to the final object file. Later files in the
import list may reverse settings in previous files.
To eliminate all fuses in the output files use:
#FUSES none
To manually set the fuses in the output files use:
#FUSES 1 = 0xC200 // sets config word 1 to 0xC200
Examples:
#fuses
HS,NOWDT
Example
Files:
Also See:
ex_sqw.c
None
#hexcomment
Syntax:
#HEXCOMMENT text comment for the top of the hex file
#HEXCOMMENT\ text comment for the end of the hex file
Elements:
None
Purpose:
Puts a comment in the hex file
Some programmers (MPLAB in particular) do not like comments at the top of the hex file.
Examples:
#HEXCOMMENT Version 3.1 – requires 20MHz crystal
Example
Files:
Also See:
None
None
#id
Syntax:
#ID number 16
#ID number, number, number, number
#ID "filename"
#ID CHECKSUM
Elements:
Number 16 is a 16 bit number, number is a 4 bit number, filename is any valid PC filename and
checksum is a keyword.
Purpose:
This directive defines the ID word to be programmed into the part. This directive does not affect the
compilation but the information is put in the output file.
The first syntax will take a 16 -bit number and put one nibble in each of the four ID words in the
traditional manner. The second syntax specifies the exact value to be used in each of the four ID
80
PreProcessor
words .
When a filename is specified the ID is read from the file. The format must be simple text with a
CR/LF at the end. The keyword CHECKSUM indicates the device checksum should be saved as the
ID.
Examples:
#id
#id
#id
0x1234
"serial.num"
CHECKSUM
Example Files:
ex_cust.c
Also See:
None
#ignore_warnings
Syntax:
#ignore_warnings ALL
#IGNORE_WARNINGS NONE
#IGNORE_WARNINGS warnings
Elements:
warnings is one or more warning numbers separated by commas
Purpose:
This function will suppress warning messages from the compiler. ALL indicates no warning will be
generated. NONE indicates all warnings will be generated. If numbers are listed then those warnings are
suppressed.
Examples:
#ignore_warnings 203
while(TRUE) {
#ignore_warnings NONE
Example
Files:
Also See:
None
Warning messages
#import (options)
Syntax:
#IMPORT (options)
Elements:
FILE=filname
The filename of the object you want to link with this compilation.
ONLY=symbol+symbol+.....+symbol
Only the listed symbols will imported from the specified relocatable object file. If neither ONLY or
EXCEPT is used, all symbols are imported.
EXCEPT=symbol+symbol+.....+symbol
The listed symbols will not be imported from the specified relocatable object file. If neither ONLY or
EXCEPT is used, all symbols are imported.
RELOCATABLE
CCS relocatable object file format. This is the default format when the #IMPORT is used.
COFF
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CCSC_March 2015-1
COFF file format from MPASM, C18 or C30.
HEX
Imported data is straight hex data.
RANGE=start:stop
Only addresses in this range are read from the hex file.
LOCATION=id
The identifier is made a constant with the start address of the imported data.
SIZE=id
The identifier is made a constant with the size of the imported data.
Purpose:
This directive will tell the compiler to include (link) a relocatable object with this unit during
compilation. Normally all global symbols from the specified file will be linked, but the EXCEPT and
ONLY options can prevent certain symbols from being linked.
The command line compiler and the PCW IDE Project Manager can also be used to compile/link/build
modules and/or projects.
Examples:
#IMPORT(FILE=timer.o, ONLY=TimerTask)
void main(void)
{
while(TRUE)
TimerTask();
}
/*
timer.o is linked with this compilation, but only TimerTask() is visible in scope
from this object.
*/
Example Files:
None
See Also:
#EXPORT, #MODULE, Invoking the Command Line Compiler, Multiple Compilation Unit
#include
Syntax:
#INCLUDE <filename>
or
#INCLUDE "filename"
Elements:
filename is a valid PC filename. It may include normal drive and path information. A file with the
extension ".encrypted" is a valid PC file. The standard compiler #INCLUDE directive will accept files
with this extension and decrypt them as they are read. This allows include files to be distributed
without releasing the source code.
Purpose:
Text from the specified file is used at this point of the compilation. If a full path is not specified the
compiler will use the list of directories specified for the project to search for the file. If the filename
is in "" then the directory with the main source file is searched first. If the filename is in <> then the
directory with the main source file is searched last.
Examples:
#include
<16C54.H>
#include
<C:\INCLUDES\COMLIB\MYRS232.C>
Example Files:
ex_sqw.c
Also See:
None
82
PreProcessor
#inline
Syntax:
#INLINE
Elements:
None
Purpose:
Tells the compiler that the function immediately following the directive is to be implemented
INLINE. This will cause a duplicate copy of the code to be placed everywhere the function is
called. This is useful to save stack space and to increase speed. Without this directive the compiler
will decide when it is best to make procedures INLINE.
Examples:
#inline
swapbyte(int &a, int &b) {
int t;
t=a;
a=b;
b=t;
}
Example Files:
ex_cust.c
Also See:
#SEPARATE
#int_xxxx
Syntax:
#INT_AD
Analog to digital conversion complete
#INT_ADOF
Analog to digital conversion timeout
#INT_BUSCOL
Bus collision
#INT_BUSCOL2
Bus collision 2 detected
#INT_BUTTON
Pushbutton
#INT_CANERR
An error has occurred in the CAN module
#INT_CANIRX
An invalid message has occurred on the CAN bus
#INT_CANRX0
CAN Receive buffer 0 has received a new message
#INT_CANRX1
CAN Receive buffer 1 has received a new message
#INT_CANTX0
CAN Transmit buffer 0 has completed transmission
#INT_CANTX1
CAN Transmit buffer 0 has completed transmission
#INT_CANTX2
CAN Transmit buffer 0 has completed transmission
#INT_CANWAKE
Bus Activity wake-up has occurred on the CAN bus
#INT_CCP1
Capture or Compare on unit 1
#INT_CCP2
Capture or Compare on unit 2
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CCSC_March 2015-1
84
#INT_CCP3
Capture or Compare on unit 3
#INT_CCP4
Capture or Compare on unit 4
#INT_CCP5
Capture or Compare on unit 5
#INT_COMP
Comparator detect
#INT_COMP0
Comparator 0 detect
#INT_COMP1
Comparator 1 detect
#INT_COMP2
Comparator 2 detect
#INT_CR
Cryptographic activity complete
#INT_EEPROM
Write complete
#INT_ETH
Ethernet module interrupt
#INT_EXT
External interrupt
#INT_EXT1
External interrupt #1
#INT_EXT2
External interrupt #2
#INT_EXT3
External interrupt #3
#INT_I2C
I2C interrupt (only on 14000)
#INT_IC1
Input Capture #1
#INT_IC2QEI
Input Capture 2 / QEI Interrupt
#IC3DR
Input Capture 3 / Direction Change Interrupt
#INT_LCD
LCD activity
#INT_LOWVOLT
Low voltage detected
#INT_LVD
Low voltage detected
#INT_OSC_FAIL
System oscillator failed
#INT_OSCF
System oscillator failed
#INT_PMP
Parallel Master Port interrupt
#INT_PSP
Parallel Slave Port data in
#INT_PWMTB
PWM Time Base
#INT_RA
Port A any change on A0_A5
#INT_RB
Port B any change on B4-B7
#INT_RC
Port C any change on C4-C7
#INT_RDA
RS232 receive data available
#INT_RDA0
RS232 receive data available in buffer 0
#INT_RDA1
RS232 receive data available in buffer 1
#INT_RDA2
RS232 receive data available in buffer 2
#INT_RTCC
Timer 0 (RTCC) overflow
#INT_SPP
Streaming Parallel Port Read/Write
#INT_SSP
SPI or I2C activity
#INT_SSP2
SPI or I2C activity for Port 2
#INT_TBE
RS232 transmit buffer empty
#INT_TBE0
RS232 transmit buffer 0 empty
#INT_TBE1
RS232 transmit buffer 1 empty
PreProcessor
#INT_TBE2
RS232 transmit buffer 2 empty
#INT_TIMER0
Timer 0 (RTCC) overflow
#INT_TIMER1
Timer 1 overflow
#INT_TIMER2
Timer 2 overflow
#INT_TIMER3
Timer 3 overflow
#INT_TIMER4
Timer 4 overflow
#INT_TIMER5
Timer 5 overflow
#INT_ULPWU
Ultra-low power wake up interrupt
#INT_USB
Universal Serial Bus activity
Note many more #INT_ options are available on specific chips. Check the devices .h file for a full list
for a given chip.
Elements:
None
Purpose:
These directives specify the following function is an interrupt function. Interrupt functions may not have any
parameters. Not all directives may be used with all parts. See the devices .h file for all valid interrupts for
the part or in PCW use the pull down VIEW | Valid Ints
The compiler will generate code to jump to the function when the interrupt is detected. It will generate code
to save and restore the machine state, and will clear the interrupt flag. To prevent the flag from being cleared
add NOCLEAR after the #INT_xxxx. The application program must call ENABLE_INTERRUPTS(INT_xxxx)
to initially activate the interrupt along with the ENABLE_INTERRUPTS(GLOBAL) to enable interrupts.
The keywords HIGH and FAST may be used with the PCH compiler to mark an interrupt as high priority. A
high-priority interrupt can interrupt another interrupt handler. An interrupt marked FAST is performed without
saving or restoring any registers. You should do as little as possible and save any registers that need to be
saved on your own. Interrupts marked HIGH can be used normally. See #DEVICE for information on building
with high-priority interrupts.
A summary of the different kinds of PIC18 interrupts:
#INT_xxxx
Normal (low priority) interrupt. Compiler saves/restores key registers.
This interrupt will not interrupt any interrupt in progress.
#INT_xxxx FAST
High priority interrupt. Compiler DOES NOT save/restore key registers.
This interrupt will interrupt any normal interrupt in progress.
Only one is allowed in a program.
#INT_xxxx HIGH
High priority interrupt. Compiler saves/restores key registers.
This interrupt will interrupt any normal interrupt in progress.
#INT_xxxx NOCLEAR
The compiler will not clear the interrupt.
The user code in the function should call clear_interrput( ) to
clear the interrupt in this case.
#INT_GLOBAL
Compiler generates no interrupt code. User function is located
at address 8 for user interrupt handling.
Some interrupts shown in the devices header file are only for the enable/disable interrupts. For example,
INT_RB3 may be used in enable/interrupts to enable pin B3. However, the interrupt handler is #INT_RB.
Similarly INT_EXT_L2H sets the interrupt edge to falling and the handler is #INT_EXT.
Examples:
#int_ad
adc_handler() {
adc_active=FALSE;
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CCSC_March 2015-1
}
#int_rtcc noclear
isr() {
...
}
Example
Files:
Also See:
See ex_sisr.c and ex_stwt.c for full example programs.
enable_interrupts(), disable_interrupts(), #INT_DEFAULT, #INT_GLOBAL, #PRIORITY
#INT_DEFAULT
Syntax:
#INT_DEFAULT
Elements:
None
Purpose:
The following function will be called if the PIC® triggers an interrupt and none of the interrupt
flags are set. If an interrupt is flagged, but is not the one triggered, the #INT_DEFAULT
function will get called.
Examples:
#int_default
default_isr() {
printf("Unexplained interrupt\r\n");
}
Example Files:
None
Also See:
#INT_xxxx, #INT_global
#int_global
Syntax:
#INT_GLOBAL
Elements:
None
Purpose:
This directive causes the following function to replace the compiler interrupt dispatcher. The
function is normally not required and should be used with great caution. When used, the
compiler does not generate start-up code or clean-up code, and does not save the registers.
Examples:
#int_global
isr() {
// Will be located at location 4 for PIC16 chips.
#asm
bsf
isr_flag
retfie
#endasm
}
Example Files:
ex_glint.c
Also See:
#INT_xxxx
86
PreProcessor
#list
Syntax:
#LIST
Elements:
None
Purpose:
#LIST begins inserting or resumes inserting source lines into the .LST file after a #NOLIST.
Examples:
#NOLIST
// Don't clutter up the list file
#include <cdriver.h>
#LIST
Example Files:
16c74.h
Also See:
#NOLIST
#line
Syntax:
#LINE number file name
Elements:
Number is non-negative decimal integer. File name is optional.
Purpose:
The C pre-processor informs the C Compiler of the location in your source code. This code is
simply used to change the value of _LINE_ and _FILE_ variables.
Examples:
1. void main(){
#line 10
// specifies the line number that
// should be reported for
// the following line of input
2. #line 7 "hello.c"
// line number in the source file
// hello.c and it sets the
// line 7 as current line
// and hello.c as current file
Example Files:
None
Also See:
None
#locate
Syntax:
#LOCATE id=x
Elements:
id is a C variable,
x is a constant memory address
Purpose:
#LOCATE allocates a C variable to a specified address. If the C variable was not previously defined, it
will be defined as an INT8.
A special form of this directive may be used to locate all A functions local variables starting at a fixed
location.
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CCSC_March 2015-1
Use: #LOCATE Auto = address
This directive will place the indirected C variable at the requested address.
Examples:
// This will locate the float variable at 50-53
// and C will not use this memory for other
// variables automatically located.
float x;
#locate x=0x 50
Example
Files:
Also See:
ex_glint.c
#byte, #bit, #reserve, #word, Named Registers, Type Specifiers, Type Qualifiers, Enumerated Types,
Structures & Unions, Typedef
#module
Syntax:
#MODULE
Elements:
None
Purpose:
All global symbols created from the #MODULE to the end of the file will only be visible within
that same block of code (and files #INCLUDE within that block). This may be used to limit the
scope of global variables and functions within include files. This directive also applies to preprocessor #defines.
Note: The extern and static data qualifiers can also be used to denote scope of variables and
functions as in the standard C methodology. #MODULE does add some benefits in that preprocessor #DEFINE can be given scope, which cannot normally be done in standard C
methodology.
Examples:
int GetCount(void);
void SetCount(int newCount);
#MODULE
int g_count;
#define G_COUNT_MAX 100
int GetCount(void) {return(g_count);}
void SetCount(int newCount) {
if (newCount>G_COUNT_MAX)
newCount=G_COUNT_MAX;
g_count=newCount;
}
/*
the functions GetCount() and SetCount() have global scope, but the variable
g_count and the #define G_COUNT_MAX only has scope to this file.
*/
Example Files:
None
See Also:
#EXPORT, Invoking the Command Line Compiler, Multiple Compilation Unit
#nolist
Syntax:
#NOLIST
Elements:
None
88
PreProcessor
Purpose:
Stops inserting source lines into the .LST file (until a #LIST)
Examples:
#NOLIST
// Don't clutter up the list file
#include <cdriver.h>
#LIST
Example Files:
16c74.h
Also See:
#LIST
#ocs
Syntax:
#OCS x
Elements:
x is the clock's speed and can be 1 Hz to 100 MHz.
Purpose:
Used instead of the #use delay(clock = x)
Examples:
#include <18F4520.h>
#device ICD=TRUE
#OCS 20 MHz
#use rs232(debugger)
void main(){
-------;
}
Example Files:
None
Also See:
#USE DELAY
#opt
Syntax:
#OPT n
Elements:
All Devices: n is the optimization level 1-11 or by using the word "compress" for PIC18 and
Enhanced PIC16 families.
Purpose:
The optimization level is set with this directive. This setting applies to the entire program and
may appear anywhere in the file. The PCW default is 9 for normal. When Compress is
specified the optimization is set to an extreme level that causes a very tight rom image, the
code is optimized for space, not speed. Debugging with this level my be more difficult.
Examples:
#opt 5
Example Files:
None
Also See:
None
89
CCSC_March 2015-1
#org
Syntax:
#ORG start, end
or
#ORG segment
or
#ORG start, end { }
or
#ORG start, end auto=0
#ORG start,end DEFAULT
or
#ORG DEFAULT
Elements:
start is the first ROM location (word address) to use, end is the last ROM location, segment is
the start ROM location from a previous #ORG
Purpose:
This directive will fix the following function, constant or ROM declaration into a specific ROM
area. End may be omitted if a segment was previously defined if you only want to add another
function to the segment.
Follow the ORG with a { } to only reserve the area with nothing inserted by the compiler.
The RAM for a ORG'd function may be reset to low memory so the local variables and scratch
variables are placed in low memory. This should only be used if the ORG'd function will not return
to the caller. The RAM used will overlap the RAM of the main program. Add a AUTO=0 at the
end of the #ORG line.
If the keyword DEFAULT is used then this address range is used for all functions user and
compiler generated from this point in the file until a #ORG DEFAULT is encountered (no address
range). If a compiler function is called from the generated code while DEFAULT is in effect the
compiler generates a new version of the function within the specified address range.
#ORG may be used to locate data in ROM. Because CONSTANT are implemented as functions
the #ORG should proceed the CONSTANT and needs a start and end address. For a ROM
declaration only the start address should be specified.
When linking multiple compilation units be aware this directive applies to the final object file. It is
an error if any #ORG overlaps between files unless the #ORG matches exactly.
Examples:
#ORG 0x1E00, 0x1FFF
MyFunc() {
//This function located at 1E00
}
#ORG 0x1E00
Anotherfunc(){
// This will be somewhere 1E00-1F00
}
#ORG 0x800, 0x820 {}
//Nothing will be at 800-820
#ORG 0x1B80
ROM int32 seridl_N0=12345;
#ORG 0x1C00, 0x1C0F
CHAR CONST ID[10}= {"123456789"};
//This ID will be at 1C00
//Note some extra code will
//proceed the 123456789
#ORG 0x1F00, 0x1FF0
Void loader (){
.
90
PreProcessor
.
.
}
Example Files:
loader.c
Also See:
#ROM
#pin_select
Syntax:
#PIN_SELECT function=pin_xx
Elements:
function is the Microchip defined pin function name, such as: U1RX (UART1
receive), INT1 (external interrupt 1), T2CK (timer 2 clock), IC1 (input capture 1),
OC1 (output capture 1).
INT1
INT2
INT3
T0CK
T3CK
CCP1
CCP2
T1G
T3G
U2RX
U2CK
SDI2
SCK2IN
SS2IN
FLT0
T0CKI
T3CKI
RX2
NULL
C1OUT
C2OUT
U2TX
U2DT
SDO2
SCK2OUT
SS2OUT
ULPOUT
P1A
P1B
P1C
P1D
P2A
P2B
P2C
External Interrupt 1
External Interrupt 2
External Interrupt 3
Timer0 External Clock
Timer3 External Clock
Input Capture 1
Input Capture 2
Timer1 Gate Input
Timer3 Gate Input
EUSART2 Asynchronous Receive/Synchronous
Receive (also named: RX2)
EUSART2 Asynchronous Clock Input
SPI2 Data Input
SPI2 Clock Input
SPI2 Slave Select Input
PWM Fault Input
Timer0 External Clock Input
Timer3 External Clock Input
EUSART2 Asynchronous
Transmit/Asynchronous Clock Output (also
named: TX2)
NULL
Comparator 1 Output
Comparator 2 Output
EUSART2 Asynchronous Transmit/
Asynchronous Clock Output (also named: TX2)
EUSART2 Synchronous Transmit (also named:
DT2)
SPI2 Data Output
SPIC2 Clock Output
SPI2 Slave Select Output
Ultra Low-Power Wake-Up Event
ECCP1 Compare or PWM Output Channel A
ECCP1 Enhanced PWM Output, Channel B
ECCP1 Enhanced PWM Output, Channel C
ECCP1 Enhanced PWM Output, Channel D
ECCP2 Compare or PWM Output Channel A
ECCP2 Enhanced PWM Output, Channel B
ECCP2 Enhanced PWM Output, Channel C
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CCSC_March 2015-1
P2D
TX2
DT2
SCK2
SSDMA
ECCP1 Enhanced PWM Output, Channel D
EUSART2 Asynchronous
Transmit/Asynchronous Clock Output (also
named: TX2)
EUSART2 Synchronous Transmit (also named:
U2DT)
SPI2 Clock Output
SPI DMA Slave Select
pin_xx is the CCS provided pin definition. For example: PIN_C7, PIN_B0,
PIN_D3, etc.
Purpose:
When using PPS chips a #PIN_SELECT must be appear before these peripherals
can be used or referenced.
Examples:
#pin_select U1TX=PIN_C6
#pin_select U1RX=PIN_C7
#pin_select INT1=PIN_B0
Example
Files:
Also See:
None
None
__pcb__
Syntax:
__PCB__
Elements:
None
Purpose:
The PCB compiler defines this pre-processor identifier. It may be used to determine if
the PCB compiler is doing the compilation.
Examples:
#ifdef __pcb__
#device PIC16c54
#endif
Example Files:
ex_sqw.c
Also See:
__PCM__, __PCH__
__pcm__
Syntax:
__PCM__
Elements:
None
Purpose:
The PCM compiler defines this pre-processor identifier. It may be used to determine if the
PCM compiler is doing the compilation.
92
PreProcessor
Examples:
#ifdef __pcm__
#device PIC16c71
#endif
Example Files:
ex_sqw.c
Also See:
__PCB__, __PCH__
__pch__
Syntax:
Elements:
Purpose:
__PCH__
None
The PCH compiler defines this pre-processor identifier. It may be used to determine if the PCH
compiler is doing the compilation.
Examples:
#ifdef _ _ PCH _ _
#device PIC18C452
#endif
Example Files:
Also See:
ex_sqw.c
__PCB__, __PCM__
#pragma
Syntax:
#PRAGMA cmd
Elements:
cmd is any valid preprocessor directive.
Purpose:
This directive is used to maintain compatibility between C compilers. This compiler will accept
this directive before any other pre-processor command. In no case does this compiler require
this directive.
Examples:
#pragma device
Example Files:
ex_cust.c
Also See:
None
PIC16C54
#priority
Syntax:
#PRIORITY ints
Elements:
ints is a list of one or more interrupts separated by commas.
export makes the functions generated from this directive available to other compilation units
within the link.
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CCSC_March 2015-1
Purpose:
The priority directive may be used to set the interrupt priority. The highest priority items are
first in the list. If an interrupt is active it is never interrupted. If two interrupts occur at around
the same time then the higher one in this list will be serviced first. When linking multiple
compilation units be aware only the one in the last compilation unit is used.
Examples:
#priority rtcc,rb
Example Files:
None
Also See:
#INT_xxxx
#profile
Syntax:
#profile options
Elements:
options may be one of the following:
functions
Profiles the start/end of functions and all
profileout() messages.
functions,
parameters
Profiles the start/end of functions,
parameters sent to functions, and all
profileout() messages.
profileout
Only profile profilout() messages.
paths
Profiles every branch in the code.
off
Disable all code profiling.
on
Re-enables the code profiling that was
previously disabled with a #profile off
command. This will use the last
options before disabled with the off
command.
Purpose:
Large programs on the microcontroller may generate lots of profile data, which may make it difficult to
debug or follow. By using #profile the user can dynamically control which points of the program are being
profiled, and limit data to what is relevant to the user.
Examples:
#profile off
void BigFunction(void)
{
// BigFunction code goes here.
// Since #profile off was called above,
// no profiling will happen even for other
// functions called by BigFunction().
}
#profile on
Example
Files:
Also See:
ex_profile.c
94
#use profile(), profileout(), Code Profile overview
PreProcessor
#reserve
Syntax:
#RESERVE address
or
#RESERVE address, address, address
or
#RESERVE start:end
Elements:
address is a RAM address, start is the first address and end is the last address
Purpose:
This directive allows RAM locations to be reserved from use by the compiler. #RESERVE must appear after
the #DEVICE otherwise it will have no effect. When linking multiple compilation units be aware this directive
applies to the final object file.
Examples:
#DEVICE PIC16C74
#RESERVE
0x60:0X6f
Example
Files:
Also See:
ex_cust.c
#ORG
#rom
Syntax:
#ROM address = {list}
#ROM type address = {list}
Elements:
address is a ROM word address, list is a list of words separated by commas
Purpose:
Allows the insertion of data into the .HEX file. In particular, this may be used to program the '84
data EEPROM, as shown in the following example.
Note that if the #ROM address is inside the program memory space, the directive creates a
segment for the data, resulting in an error if a #ORG is over the same area. The #ROM data will
also be counted as used program memory space.
The type option indicates the type of each item, the default is 16 bits. Using char as the type
treats each item as 7 bits packing 2 chars into every pcm 14-bit word.
When linking multiple compilation units be aware this directive applies to the final object file.
Some special forms of this directive may be used for verifying program memory:
#ROM address = checksum
This will put a value at address such that the entire program memory will sum to 0x1248
#ROM address = crc16
This will put a value at address that is a crc16 of all the program memory except the specified
address
#ROM address = crc8
This will put a value at address that is a crc16 of all the program memory except the specified
address
Examples:
#rom getnev ("EEPROM_ADDRESS")={1,2,3,4,5,6,7,8}
#rom int8 0x1000={"(c)CCS, 2010"}
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CCSC_March 2015-1
Example Files:
None
Also See:
#ORG
#separate
Syntax:
#SEPARATE
Elements:
None
Purpose:
Tells the compiler that the procedure IMMEDIATELY following the directive is to be implemented
SEPARATELY. This is useful to prevent the compiler from automatically making a procedure
INLINE. This will save ROM space but it does use more stack space. The compiler will make all
procedures marked SEPARATE, separate, as requested, even if there is not enough stack space
to execute.
Examples:
#separate
swapbyte (int *a, int *b) {
int t;
t=*a;
*a=*b;
*b=t;
}
Example Files:
ex_cust.c
Also See:
#INLINE
#serialize
Syntax:
#SERIALIZE(id=xxx, next="x" | file="filename.txt" " | listfile="filename.txt", "prompt="text",
log="filename.txt") or
#SERIALIZE(dataee=x, binary=x, next="x" | file="filename.txt" | listfile="filename.txt",
prompt="text", log="filename.txt")
Elements:
id=xxx - Specify a C CONST identifier, may be int8, int16, int32 or char array
Use in place of id parameter, when storing serial number to EEPROM:
dataee=x - The address x is the start address in the data EEPROM.
binary=x - The integer x is the number of bytes to be written to address specified. -orstring=x - The integer x is the number of bytes to be written to address specified.
unicode=n - If n is a 0, the string format is normal unicode. For n>0 n indicates the string
number in a USB descriptor.
Use only one of the next three options:
file="filename.txt" - The file x is used to read the initial serial number from, and this file is updated
by the ICD programmer. It is assumed this is a one line file with the serial number. The
programmer will increment the serial number.
listfile="filename.txt" - The file x is used to read the initial serial number from, and this file is
updated by the ICD programmer. It is assumed this is a file one serial number per line. The
programmer will read the first line then delete that line from the file.
96
PreProcessor
next="x" - The serial number X is used for the first load, then the hex file is updated to increment x
by one.
Other optional parameters:
prompt="text" - If specified the user will be prompted for a serial number on each load. If used
with one of the above three options then the default value the user may use is picked according to
the above rules.
log=xxx - A file may optionally be specified to keep a log of the date, time, hex file name and serial
number each time the part is programmed. If no id=xxx is specified then this may be used as a
simple log of all loads of the hex file.
Purpose:
Assists in making serial numbers easier to implement when working with CCS ICD units.
Comments are inserted into the hex file that the ICD software interprets.
Examples:
//Prompt user for serial number to be placed
//at address of serialNumA
//Default serial number = 200int8int8 const serialNumA=100;
#serialize(id=serialNumA,next="200",prompt="Enter the serial number")
//Adds serial number log in seriallog.txt
#serialize(id=serialNumA,next="200",prompt="Enter the serial number",
log="seriallog.txt")
//Retrieves serial number from serials.txt
#serialize(id=serialNumA,listfile="serials.txt")
//Place serial number at EEPROM address 0, reserving 1 byte
#serialize(dataee=0,binary=1,next="45",prompt="Put in Serial number")
//Place string serial number at EEPROM address 0, reserving 2 bytes
#serialize(dataee=0, string=2,next="AB",prompt="Put in Serial number")
Example Files:
None
Also See:
None
#task
(The RTOS is only included with the PCW, PCWH, and PCWHD software packages.)
Each RTOS task is specified as a function that has no parameters and no return. The #TASK directive is needed just
before each RTOS task to enable the compiler to tell which functions are RTOS tasks. An RTOS task cannot be
called directly like a regular function can.
Syntax:
#TASK (options)
Elements:
options are separated by comma and may be:
rate=time
Where time is a number followed by s, ms, us, or ns. This specifies how often the task will execute.
max=time
Where time is a number followed by s, ms, us, or ns. This specifies the budgeted time for this task.
queue=bytes
Specifies how many bytes to allocate for this task's incoming messages. The default value is 0.
enabled=value
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CCSC_March 2015-1
Specifies whether a task is enabled or disabled by rtos_run( ).
True for enabled, false for disabled. The default value is enabled.
Purpose:
This directive tells the compiler that the following function is an RTOS task.
The rate option is used to specify how often the task should execute. This must be a multiple of the
minor_cycle option if one is specified in the #USE RTOS directive.
The max option is used to specify how much processor time a task will use in one execution of the
task. The time specified in max must be equal to or less than the time specified in the minor_cycle
option of the #USE RTOS directive before the project will compile successfully. The compiler does
not have a way to enforce this limit on processor time, so a programmer must be careful with how
much processor time a task uses for execution. This option does not need to be specified.
The queue option is used to specify the number of bytes to be reserved
for the task to receive messages from other tasks or functions. The default queue value is 0.
Examples:
#task(rate=1s, max=20ms, queue=5)
Also See:
#USE RTOS
__time__
Syntax:
__TIME__
Elements:
None
Purpose:
This pre-processor identifier is replaced at compile time with the time of the compile in the
form: "hh:mm:ss"
Examples:
printf("Software was compiled on ");
printf(__TIME__);
Example Files:
None
Also See:
None
#type
Syntax:
#TYPE standard-type=size
#TYPE default=area
#TYPE unsigned
#TYPE signed
Elements:
standard-type is one of the C keywords short, int, long, or default
size is 1,8,16, or 32
area is a memory region defined before the #TYPE using the addressmod directive
Purpose:
By default the compiler treats SHORT as one bit , INT as 8 bits, and LONG as 16 bits. The traditional C
convention is to have INT defined as the most efficient size for the target processor. This is why it is 8 bits on
98
PreProcessor
the PIC ® . In order to help with code compatibility a #TYPE directive may be used to allow these types to be
changed. #TYPE can redefine these keywords.
Note that the commas are optional. Since #TYPE may render some sizes inaccessible (like a one bit int in
the above) four keywords representing the four ints may always be used: INT1, INT8, INT16, and INT32.
Be warned CCS example programs and include files may not work right if you use #TYPE in your program.
This directive may also be used to change the default RAM area used for variable storage. This is done by
specifying default=area where area is a addressmod address space.
When linking multiple compilation units be aware this directive only applies to the current compilation unit.
The #TYPE directive allows the keywords UNSIGNED and SIGNED to set the default data type.
Examples:
#TYPE
SHORT= 8 , INT= 16 , LONG= 32
#TYPE default=area
addressmod (user_ram_block, 0x100, 0x1FF);
#type default=user_ram_block
// all variable declarations
// in this area will be in
// 0x100-0x1FF
#type default=
// restores memory allocation
// back to normal
#TYPE SIGNED
...
void main()
{
int variable1;
...
...
}
Example
Files:
Also See:
// variable1 can only take values from -128 to 127
ex_cust.c
None
#undef
Syntax:
#UNDEF id
Elements:
id is a pre-processor id defined via #DEFINE
Purpose:
The specified pre-processor ID will no longer have meaning to the pre-processor.
Examples:
#if MAXSIZE<100
#undef MAXSIZE
#define MAXSIZE 100
#endif
Example Files:
None
Also See:
#DEFINE
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CCSC_March 2015-1
_unicode
Syntax:
__unicode( constant-string )
Elements:
Unicode format string
Purpose
This macro will convert a standard ASCII string to a Unicode format string by inserting a
\000 after each character and removing the normal C string terminator.
For example: _unicode("ABCD")
will return:
"A\00B\000C\000D" (8 bytes total with the terminator)
Since the normal C terminator is not used for these strings you need to do one of the
following for variable length strings:
string = _unicode(KEYWORD) "\000\000";
OR
string = _unicode(KEYWORD);
string_size = sizeof(_unicode(KEYWORD));
#define USB_DESC_STRING_TYPE 3
Examples:
#define USB_STRING(x) (sizeof(_unicode(x))+2),USB_DESC_STRING_TYPE,_unicode(x)
#define USB_ENGLISH_STRING 4,USB_DESC_STRING_TYPE,0x09,0x04
//Microsoft Defined for US-English
char const USB_STRING_DESC[]=[
USB_ENGLISH_STRING,
USB_STRING("CCS"),
USB_STRING("CCS HID DEMO")
};
Example Files:
usb_desc_hid.h
#use capture
Syntax:
Elements:
#USE CAPTURE(options)
ICx/CCPx
Which CCP/Input Capture module to us.
INPUT = PIN_xx
Specifies which pin to use. Useful for device with remappable pins, this will cause
compiler to automatically assign pin to peripheral.
TIMER=x
Specifies the timer to use with capture unit. If not specified default to timer 1 for
PCM and PCH compilers and timer 3 for PCD compiler.
TICK=x
The tick time to setup the timer to. If not specified it will be set to fastest as
possible or if same timer was already setup by a previous stream it will be set to
that tick time. If using same timer as previous stream and different tick time an
100
PreProcessor
error will be generated.
FASTEST
Use instead of TICK=x to set tick time to fastest as possible.
SLOWEST
Use instead of TICK=x to set tick time to slowest as possible.
CAPTURE_RISING
Specifies the edge that timer value is captured on. Defaults to
CAPTURE_RISING.
CAPTURE_FALLING
Specifies the edge that timer value is captured on. Defaults to
CAPTURE_RISING.
CAPTURE_BOTH
PCD only. Specifies the edge that timer value is captured on. Defaults to
CAPTURE_RISING.
PRE=x
Specifies number of rising edges before capture event occurs. Valid options are 1,
4 and 16, default to 1 if not specified. Options 4 and 16 are only valid when using
CAPTURE_RISING, will generate an error is used with CAPTURE_FALLING or
CAPTURE_BOTH.
ISR=x
STREAM=id
Associates a stream identifier with the capture module. The identifier may be used
in functions like get_capture_time().
DEFINE=id
Creates a define named id which specifies the number of capture per second.
Default define name if not specified is CAPTURES_PER_SECOND. Define name
must start with an ASCII letter 'A' to 'Z', an ASCII letter 'a' to 'z' or an ASCII
underscore ('_').
This directive tells the compiler to setup an input capture on the specified pin using
the specified settings. The #USE DELAY directive must appear before this
directive can be used. This directive enables use of built-in functions such as
get_capture_time() and get_capture_event().
#USE CAPTURE(INPUT=PIN_C2,CAPTURE_RISING,TIMER=1,FASTEST)
None.
Purpose:
Examples:
Example
Files:
Also See:
get_capture_time(), get_capture_event()
#use delay
Syntax:
#USE DELAY (options))
Elements:
Options may be any of the following separated by commas:
clock=speed speed is a constant 1-100000000 (1 hz to 100 mhz).
This number can contains commas. This number also supports the following denominations: M, MHZ, K, KHZ.
This specifies the clock the CPU runs at. Depending on the PIC this is 2 or 4 times the instruction rate. This
directive is not needed if the following type=speed is used and there is no frequency multiplication or division.
type=speed type defines what kind of clock you are using, and the following values are valid: oscillator, osc
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CCSC_March 2015-1
(same as oscillator), crystal, xtal (same as crystal), internal, int (same as internal) or rc. The compiler will
automatically set the oscillator configuration bits based upon your defined type. If you specified internal, the
compiler will also automatically set the internal oscillator to the defined speed. Configuration fuses are modified
when this option is used. Speed is the input frequency.
restart_wdt will restart the watchdog timer on every delay_us() and delay_ms() use.
clock_out when used with the internal or oscillator types this enables the clockout pin to output the clock.
fast_start some chips allow the chip to begin execution using an internal clock until the primary clock is stable.
lock some chips can prevent the oscillator type from being changed at run time by the software.
USB or USB_FULL for devices with a built-in USB peripheral. When used with the type=speed option the
compiler will set the correct configuration bits for the USB peripheral to operate at Full-Speed.
USB_LOW for devices with a built-in USB peripheral. When used with the type=speed option the compiler will
set the correct configuration bits for the USB peripheral to operate at Low-Speed.
ACT or ACT=type for device with Active Clock Tuning, type can be either USB or SOSC. If only using ACT
type will default to USB. ACT=USB causes the compiler to enable the active clock tuning and to tune the
internal oscillator to the USB clock. ACT=SOSC causes the compiler to enable the active clock tuning and to
tune the internal oscillator to the secondary clock at 32.768 kHz. ACT can only be used when the system clock
is set to run from the internal oscillator.
Also See:
delay_ms(), delay_us()
#use dynamic_memory
Syntax:
#USE DYNAMIC_MEMORY
Elements:
None
Purpose:
This pre-processor directive instructs the compiler to create the _DYNAMIC_HEAD object.
_DYNAMIC_HEAD is the location where the first free space is allocated.
Examples:
#USE DYNAMIC_MEMORY
void main ( ){
}
Example
Files:
Also See:
ex_malloc.c
None
#use fast_io
Syntax:
#USE FAST_IO (port)
Elements:
port is A, B, C, D, E, F, G, H, J or ALL
102
PreProcessor
Purpose:
Affects how the compiler will generate code for input and output instructions that follow. This directive takes
effect until another #use xxxx_IO directive is encountered. The fast method of doing I/O will cause the
compiler to perform I/O without programming of the direction register. The compiler's default operation is the
opposite of this command, the direction I/O will be set/cleared on each I/O operation. The user must ensure
the direction register is set correctly via set_tris_X(). When linking multiple compilation units be aware this
directive only applies to the current compilation unit.
Examples:
#use fast_io(A)
Example
Files:
Also See:
ex_cust.c
#USE FIXED_IO, #USE STANDARD_IO, set_tris_X() , General Purpose I/O
#use fixed_io
Syntax:
#USE FIXED_IO (port_outputs=pin, pin?)
Elements:
port is A-G, pin is one of the pin constants defined in the devices .h file.
Purpose:
This directive affects how the compiler will generate code for input and output instructions that follow. This
directive takes effect until another #USE XXX_IO directive is encountered. The fixed method of doing I/O will
cause the compiler to generate code to make an I/O pin either input or output every time it is used. The pins
are programmed according to the information in this directive (not the operations actually performed). This
saves a byte of RAM used in standard I/O. When linking multiple compilation units be aware this directive only
applies to the current compilation unit.
Examples:
#use fixed_io(a_outputs=PIN_A2, PIN_A3)
Example
Files:
Also See:
None
#USE FAST_IO, #USE STANDARD_IO, General Purpose I/O
#use i2c
Syntax:
#USE I2C (options)
Elements:
Options are separated by commas and may be:
MASTER
Sets to the master mode
MULTI_MASTER
Set the multi_master mode
SLAVE
Set the slave mode
SCL=pin
Specifies the SCL pin (pin is a bit address)
SDA=pin
Specifies the SDA pin
ADDRESS=nn
Specifies the slave mode address
FAST
Use the fast I2C specification.
FAST=nnnnnn
Sets the speed to nnnnnn hz
SLOW
Use the slow I2C specification
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CCSC_March 2015-1
RESTART_WDT
Restart the WDT while waiting in I2C_READ
FORCE_HW
Use hardware I2C functions.
FORCE_SW
Use software I2C functions.
NOFLOAT_HIGH
Does not allow signals to float high, signals are driven from low to
high
Bus used is not I2C bus, but very similar
SMBUS
STREAM=id
NO_STRETCH
Associates a stream identifier with this I2C port. The identifier may
then be used in functions like i2c_read or i2c_write.
Do not allow clock streaching
MASK=nn
Set an address mask for parts that support it
I2C1
Instead of SCL= and SDA= this sets the pins to the first module
I2C2
Instead of SCL= and SDA= this sets the pins to the second module
NOINIT
No initialization of the I2C peripheral is performed. Use I2C_INIT()
to initialize peripheral at run time.
Only some chips allow the following:
DATA_HOLD
No ACK is sent until I2C_READ is called for data bytes (slave only)
ADDRESS_HOLD
No ACK is sent until I2C_read is called for the address byte (slave only)
SDA_HOLD
Min of 300ns holdtime on SDA a from SCL goes low
Purpose:
CCS offers support for the hardware-based I2CTM and a software-based master I2CTM device.(For more
information on the hardware-based I2C module, please consult the datasheet for your target device; not all
PICs support I2CTM.
The I2C library contains functions to implement an I2C bus. The #USE I2C remains in effect for the
I2C_START, I2C_STOP, I2C_READ, I2C_WRITE and I2C_POLL functions until another USE I2C is
encountered. Software functions are generated unless the FORCE_HW is specified. The SLAVE mode should
only be used with the built-in SSP. The functions created with this directive are exported when using multiple
compilation units. To access the correct function use the stream identifier.
Examples:
#use I2C(master, sda=PIN_B0, scl=PIN_B1)
#use I2C(slave,sda=PIN_C4,scl=PIN_C3
address=0xa0,FORCE_HW)
#use I2C(master, scl=PIN_B0, sda=PIN_B1, fast=450000)
//sets the target speed to 450 KBSP
Example
Files:
Also See:
ex_extee.c with 16c74.h
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i 2c_write, i2c_read, I2C
Overview
#use profile()
Syntax:
#use profile(options)
Elements:
options may be any of the following, comma separated:
ICD
104
Default – configures code profiler to use the ICD
connection.
PreProcessor
TIMER1
Optional. If specified, the code profiler run-time on
the microcontroller will use the Timer1 peripheral as
a timestamp for all profile events. If not specified
the code profiler tool will use the PC clock, which
may not be accurate for fast events.
BAUD=x
Optional. If specified, will use a different baud rate between the
microcontroller and the code profiler tool. This may be required
on slow microcontrollers to attempt to use a slower baud rate.
Purpose:
Tell the compiler to add the code profiler run-time in the microcontroller and configure the link and clock.
Examples:
#profile(ICD, TIMER1, baud=9600)
Example
Files:
Also See:
ex_profile.c
#profile(), profileout(), Code Profile overview
#use pwm
Syntax:
Elements:
#USE PWM(options)
Options are separated by commas and may be:
PWMx or CCPx
Selects the CCP to use, x being the module number to use.
OUTPUT=PIN_xx
Selects the PWM pin to use, pin must be one of the CCP pins. If device has remappable pins
compiler will assign specified pin to specified CCP module. If CCP module not specified it will
assign remappable pin to first available module.
Selects timer to use with PWM module, default if not specified is timer 2.
Sets the period of PWM based off specified value, should not be used if PERIOD is already
specified. If frequency can't be achieved exactly compiler will generate a message specifying the
exact frequency and period of PWM. If neither FREQUENCY or PERIOD is specified, the period
defaults to maximum possible period with maximum resolution and compiler will generate a
message specifying the frequency and period of PWM, or if using same timer as previous stream
instead of setting to maximum possible it will be set to the same as previous stream. If using
same timer as previous stream and frequency is different compiler will generate an error.
Sets the period of PWM, should not be used if FREQUENCY is already specified. If period can't
be achieved exactly compiler will generate a message specifying the exact period and frequency
of PWM. If neither PERIOD or FREQUENCY is specified, the period defaults to maximum
possible period with maximum resolution and compiler will generate a message specifying the
frequency and period of PWM, or if using same timer as previous stream instead of setting to
maximum possible it will be set to the same as previous stream. If using same timer as previous
stream and period is different compiler will generate an error.
Sets the resolution of the the duty cycle, if period or frequency is specified will adjust the period to
meet set resolution and will generate an message specifying the frequency and duty of PWM. If
period or frequency not specified will set period to maximum possible for specified resolution and
compiler will generate a message specifying the frequency and period of PWM, unless using
same timer as previous then it will generate an error if resolution is different then previous stream.
If not specified then frequency, period or previous stream using same timer sets the resolution.
Selects the duty percentage of PWM, default if not specified is 50%.
TIMER=x
FREQUENCY=x
PERIOD=x
BITS=x
DUTY=x
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CCSC_March 2015-1
STREAM=id
Associates a stream identifier with the PWM signal. The identifier may be used in functions like
pwm_set_duty_percent().
Purpose:
This directive tells the compiler to setup a PWM on the specified pin using the specified
frequency, period, duty cycle and resolution. The #USE DELAY directive must appear
before this directive can be used. This directive enables use of built-in functions such as
set_pwm_duty_percent(), set_pwm_frequency(), set_pwm_period(), pwm_on() and
pwm_off().
None
Example Files
Also See:
#use rs232
Syntax:
#USE RS232 (options)
Elements:
Options are separated by commas and may be:
STREAM=id
Associates a stream identifier with this RS232 port. The identifier may
then be used in functions like fputc.
106
BAUD=x
Set baud rate to x
XMIT=pin
Set transmit pin
RCV=pin
Set receive pin
FORCE_SW
Will generate software serial I/O routines even when the UART pins are
specified.
BRGH1OK
Allow bad baud rates on chips that have baud rate problems.
ENABLE=pin
The specified pin will be high during transmit. This may be used to enable
485 transmit.
DEBUGGER
Indicates this stream is used to send/receive data through a CCS ICD unit.
The default pin used is B3, use XMIT= and RCV= to change the pin used.
Both should be the same pin.
RESTART_WDT
Will cause GETC() to clear the WDT as it waits for a character.
INVERT
Invert the polarity of the serial pins (normally not needed when level
converter, such as the MAX232). May not be used with the internal UART.
PARITY=X
Where x is N, E, or O.
BITS =X
Where x is 5-9 (5-7 may not be used with the SCI).
FLOAT_HIGH
The line is not driven high. This is used for open collector outputs. Bit 6 in
RS232_ERRORS is set if the pin is not high at the end of the bit time.
ERRORS
Used to cause the compiler to keep receive errors in the variable
RS232_ERRORS and to reset errors when they occur.
SAMPLE_EARLY
A getc() normally samples data in the middle of a bit time. This option
causes the sample to be at the start of a bit time. May not be used with the
UART.
RETURN=pin
For FLOAT_HIGH and MULTI_MASTER this is the pin used to read the
signal back. The default for FLOAT_HIGH is the XMIT pin and for
PreProcessor
MULTI_MASTER the RCV pin.
MULTI_MASTER
Uses the RETURN pin to determine if another master on the bus is
transmitting at the same time. If a collision is detected bit 6 is set in
RS232_ERRORS and all future PUTC's are ignored until bit 6 is cleared.
The signal is checked at the start and end of a bit time. May not be used
with the UART.
LONG_DATA
Makes getc() return an int16 and putc accept an int16. This is for 9 bit data
formats.
DISABLE_INTS
Will cause interrupts to be disabled when the routines get or put a character.
This prevents character distortion for software implemented I/O and prevents
interaction between I/O in interrupt handlers and the main program when
using the UART.
STOP=X
To set the number of stop bits (default is 1). This works for both UART and
non-UART ports.
TIMEOUT=X
To set the time getc() waits for a byte in milliseconds. If no character comes
in within this time the RS232_ERRORS is set to 0 as well as the return value
form getc(). This works for both UART and non-UART ports.
SYNC_SLAVE
Makes the RS232 line a synchronous slave, making the receive pin a clock
in, and the data pin the data in/out.
SYNC_MASTER
Makes the RS232 line a synchronous master, making the receive pin a clock
out, and the data pin the data in/out.
SYNC_MATER_CONT
Makes the RS232 line a synchronous master mode in continuous receive
mode. The receive pin is set as a clock out, and the data pin is set as the
data in/out.
UART1
Sets the XMIT= and RCV= to the chips first hardware UART.
UART2
Sets the XMIT= and RCV= to the chips second hardware UART.
NOINIT
No initialization of the UART peripheral is performed. Useful for dynamic
control of the UART baudrate or initializing the peripheral manually at a later
point in the program's run time. If this option is used, then setup_uart( )
needs to be used to initialize the peripheral. Using a serial routine (such as
getc( ) or putc( )) before the UART is initialized will cause undefined
behavior.
Indicates this stream is used to send/receive data through a CCS ICD unit.
The default trasmit pin is the PIC's ICSPDAT/PGD pin and the default
receive pin is the PIC's ICSPCLK/PGC pin. Use XMIT= and RCV= to
change the pins used.
Sets the XMIT= and RCV= to the device's third hardware UART.
Sets the XMIT= and RCV= to the device's fourth hardware UART.
ICD
UART3
UART4
Serial Buffer Options:
RECEIVE_BUFFER=x
TRANSMIT_BUFFER=x
TXISR
NOTXISR
Flow Control Options:
RTS = PIN_xx
Size in bytes of UART circular receive buffer, default if not specified is zero.
Uses an interrupt to receive data, supports RDA interrupt or external
interrupts.
Size in bytes of UART circular transmit buffer, default if not specified is zero.
If TRANSMIT_BUFFER is greater then zero specifies using TBE interrupt for
transmitting data. Default is NOTXISR if TXISR or NOTXISR is not
specified. TXISR option can only be used when using hardware UART.
If TRANSMIT_BUFFER is greater then zero specifies to not use TBE
interrupt for transmitting data. Default is NOTXISR if TXISR or NOTXISR is
not specified and XMIT_BUFFER is greater then zero
Pin to use for RTS flow control. When using FLOW_CONTROL_MODE this
107
CCSC_March 2015-1
RTS_LEVEL=x
CTS = PIN_xx
CTS_LEVEL=x
FLOW_CONTROL_MODE
SIMPLEX_MODE
Purpose:
pin is driven to the active level when it is ready to receive more data. In
SIMPLEX_MODE the pin is driven to the active level when it has data to
transmit. FLOW_CONTROL_MODE can only be use when using
RECEIVE_BUFFER
Specifies the active level of the RTS pin, HIGH is active high and LOW is
active low. Defaults to LOW if not specified.
Pin to use for CTS flow control. In both FLOW_CONTROL_MODE and
SIMPLEX_MODE this pin is sampled to see if it clear to send data. If pin is
at active level and there is data to send it will send next data byte.
Specifies the active level of the CTS pin, HIGH is active high and LOW is
active low. Default to LOW if not specified
Specifies how the RTS pin is used. For FLOW_CONTROL_MODE the RTS
pin is driven to the active level when ready to receive data. Defaults to
FLOW_CONTROL_MODE when neither FLOW_CONTROL_MODE or
SIMPLEX_MODE is specified. If RTS pin isn't specified then this option is
not used.
Specifies how the RTS pin is used. For SIMPLEX_MODE the RTS pin is
driven to the active level when it has data to send. Defaults to
FLOW_CONTROL_MODE when neither FLOW_CONTROL_MODE or
SIMPLEX_MODE is specified. If RTS pin isn't specified then this option is
not used.
This directive tells the compiler the baud rate and pins used for serial I/O. This directive takes effect until
another RS232 directive is encountered. The #USE DELAY directive must appear before this directive can be
used. This directive enables use of built-in functions such as GETC, PUTC, and PRINTF. The functions
created with this directive are exported when using multiple compilation units. To access the correct function
use the stream identifier.
When using parts with built-in SCI and the SCI pins are specified, the SCI will be used. If a baud rate cannot
be achieved within 3% of the desired value using the current clock rate, an error will be generated. The
definition of the RS232_ERRORS is as follows:
No UART:
 Bit 7 is 9th bit for 9 bit data mode (get and put).
 Bit 6 set to one indicates a put failed in float high mode.
With a UART:
 Used only by get:
 Copy of RCSTA register except:
 Bit 0 is used to indicate a parity error.
Warning:
The PIC UART will shut down on overflow (3 characters received by the hardware with a GETC() call). The
"ERRORS" option prevents the shutdown by detecting the condition and resetting the UART.
Examples:
#use rs232(baud=9600, xmit=PIN_A2,rcv=PIN_A3)
Example
Files:
Also See:
ex_cust.c
getc(), putc(), printf(), setup_uart( ), RS2332 I/O overview
#use rtos
(The RTOS is only included with the PCW and PCWH packages.)
The CCS Real Time Operating System (RTOS) allows a PIC micro controller to
run regularly scheduled tasks without the need for interrupts. This is
108
PreProcessor
accomplished by a function (RTOS_RUN()) that acts as a dispatcher. When a
task is scheduled to run, the dispatch function gives control of the processor to
that task. When the task is done executing or does not need the processor
anymore, control of the processor is returned to the dispatch function which
then will give control of the processor to the next task that is scheduled to
execute at the appropriate time. This process is called cooperative multitasking.
Syntax:
#USE RTOS (options)
Elements:
options are separated by comma and may be:
timer=X
Where x is 0-4 specifying the timer used by the RTOS.
minor_cycle=time
Where time is a number followed by s, ms, us, ns. This is the
longest time any task will run. Each task's execution rate must be a
multiple of this time. The compiler can calculate this if it is not
specified.
statistics
Maintain min, max, and total time used by each task.
Purpose:
This directive tells the compiler which timer on the PIC to use for monitoring and when to grant control to a
task. Changes to the specified timer's prescaler will effect the rate at which tasks are executed.
This directive can also be used to specify the longest time that a task will ever take to execute with the
minor_cycle option. This simply forces all task execution rates to be a multiple of the minor_cycle before the
project will compile successfully. If the this option is not specified the compiler will use a minor_cycle value
that is the smallest possible factor of the execution rates of the RTOS tasks.
If the statistics option is specified then the compiler will keep track of the minimum processor time taken by
one execution of each task, the maximum processor time taken by one execution of each task, and the total
processor time used by each task.
When linking multiple compilation units, this directive must appear exactly the same in each compilation unit.
Examples:
#use rtos(timer=0, minor_cycle=20ms)
Also See:
#TASK
#use spi
Syntax:
#USE SPI (options)
Elements:
Options are separated by commas and may be:
MASTER
Set the device as the master. (default)
SLAVE
Set the device as the slave.
BAUD=n
Target bits per second, default is as fast as possible.
CLOCK_HIGH=n
High time of clock in us (not needed if BAUD= is used). (default=0)
CLOCK_LOW=n
Low time of clock in us (not needed if BAUD= is used). (default=0)
DI=pin
Optional pin for incoming data.
DO=pin
Optional pin for outgoing data.
CLK=pin
Clock pin.
MODE=n
The mode to put the SPI bus.
ENABLE=pin
Optional pin to be active during data transfer.
LOAD=pin
Optional pin to be pulsed active after data is transferred.
DIAGNOSTIC=pin
Optional pin to the set high when data is sampled.
SAMPLE_RISE
Sample on rising edge.
SAMPLE_FALL
Sample on falling edge (default).
BITS=n
Max number of bits in a transfer. (default=32)
SAMPLE_COUNT=n
Number of samples to take (uses majority vote). (default=1
109
CCSC_March 2015-1
LOAD_ACTIVE=n
ENABLE_ACTIVE=n
IDLE=n
ENABLE_DELAY=n
DATA_HOLD=n
LSB_FIRST
MSB_FIRST
STREAM=id
SPI1
SPI2
FORCE_HW
NOINIT
Purpose:
Active state for LOAD pin (0, 1).
Active state for ENABLE pin (0, 1). (default=0)
Inactive state for CLK pin (0, 1). (default=0)
Time in us to delay after ENABLE is activated. (default=0)
Time between data change and clock change
LSB is sent first.
MSB is sent first. (default)
Specify a stream name for this protocol.
Use the hardware pins for SPI Port 1
Use the hardware pins for SPI Port 2
Use the pic hardware SPI.
Don't initialize the hardware SPI Port
The SPI library contains functions to implement an SPI bus. After setting all of the proper parameters in
#USE SPI, the spi_xfer() function can be used to both transfer and receive data on the SPI bus.
The SPI1 and SPI2 options will use the SPI hardware onboard the PIC. The most common pins present on
hardware SPI are: DI, DO, and CLK. These pins don’t need to be assigned values through the options; the
compiler will automatically assign hardware-specific values to these pins. Consult your PIC’s data sheet as to
where the pins for hardware SPI are. If hardware SPI is not used, then software SPI will be used. Software
SPI is much slower than hardware SPI, but software SPI can use any pins to transfer and receive data other
than just the pins tied to the PIC’s hardware SPI pins.
The MODE option is more or less a quick way to specify how the stream is going to sample data. MODE=0
sets IDLE=0 and SAMPLE_RISE. MODE=1 sets IDLE=0 and SAMPLE_FALL. MODE=2 sets IDLE=1 and
SAMPLE_FALL. MODE=3 sets IDLE=1 and SAMPLE_RISE. There are only these 4 MODEs.
SPI cannot use the same pins for DI and DO. If needed, specify two streams: one to send data and another
to receive data.
The pins must be specified with DI, DO, CLK or SPIx, all other options are defaulted as indicated above.
Examples:
#use spi(DI=PIN_B1, DO=PIN_B0, CLK=PIN_B2, ENABLE=PIN_B4, BITS=16)
// uses software SPI
#use spi(FORCE_HW, BITS=16, stream=SPI_STREAM)
// uses hardware SPI and gives this stream the name SPI_STREAM
Example
Files:
Also See:
None
spi_xfer()
#use standard_io
Syntax:
#USE STANDARD_IO (port)
Elements:
port is A, B, C, D, E, F, G, H, J or ALL
Purpose:
This directive affects how the compiler will generate code for input and output instructions that follow. This
directive takes effect until another #USE XXX_IO directive is encountered. The standard method of doing I/O
will cause the compiler to generate code to make an I/O pin either input or output every time it is used. On the
5X processors this requires one byte of RAM for every port set to standard I/O.
Standard_io is the default I/O method for all ports.
When linking multiple compilation units be aware this directive only applies to the current compilation unit.
Examples:
110
#use standard_io(A)
PreProcessor
Example
Files:
Also See:
ex_cust.c
#USE FAST_IO, #USE FIXED_IO, General Purpose I/O
#use timer
Syntax:
#USE TIMER (options)
Elements:
TIMER=x
Sets the timer to use as the tick timer. x is a valid timer that the PIC has. Default value is 1 for Timer 1.
TICK=xx
Sets the desired time for 1 tick. xx can be used with ns(nanoseconds), us (microseconds), ms
(milliseconds), or s (seconds). If the desired tick time can't be achieved it will set the time to closest
achievable time and will generate a warning specifying the exact tick time. The default value is 1us.
BITS=x
Sets the variable size used by the get_ticks() and set_ticks() functions for returning and setting the tick time.
x can be 8 for 8 bits, 16 for 16 bits or 32 for 32bits. The default is 32 for 32 bits.
ISR
Uses the timer's interrupt to increment the upper bits of the tick timer. This mode requires the the global
interrupt be enabled in the main program.
NOISR
The get_ticks() function increments the upper bits of the tick timer. This requires that the get_ticks() function
be called more often then the timer's overflow rate. NOISR is the default mode of operation.
STREAM=id
Associates a stream identifier with the tick timer. The identifier may be used in functions like get_ticks().
DEFINE=id
Creates a define named id which specifies the number of ticks that will occur in one second. Default define
name if not specified is TICKS_PER_SECOND. Define name must start with an ASCII letter 'A' to 'Z', an
ASCII letter 'a' to 'z' or an ASCII underscore ('_').
COUNTER or COUNTER=x
Sets up specified timer as a counter instead of timer. x specifies the prescallar to setup counter with, default
is1 if x is not specified specified. The function get_ticks() will return the current count and the function
set_ticks() can be used to set count to a specific starting value or to clear counter.
Purpose:
This directive creates a tick timer using one of the PIC's timers. The tick timer is initialized to zero at
program start. This directive also creates the define TICKS_PER_SECOND as a floating point number,
which specifies that number of ticks that will occur in one second.
Examples:
#USE TIMER(TIMER=1,TICK=1ms,BITS=16,NOISR)
unsigned int16 tick_difference(unsigned int16 current, unsigned int16 previous) {
return(current - previous);
}
void main(void) {
unsigned int16 current_tick, previous_tick;
current_tick = previous_tick = get_ticks();
while(TRUE) {
current_tick = get_ticks();
if(tick_difference(current_tick, previous_tick) > 1000) {
output_toggle(PIN_B0);
111
CCSC_March 2015-1
previous_tick = current_tick;
}
}
}
Example
Files:
Also See:
None
get_ticks(), set_ticks()
#use touchpad
Syntax:
#USE TOUCHPAD (options)
Elements:
RANGE=x
Sets the oscillator charge/discharge current range. If x is L, current is nominally 0.1 microamps. If x is M,
current is nominally 1.2 microamps. If x is H, current is nominally 18 microamps. Default value is H (18
microamps).
THRESHOLD=x
x is a number between 1-100 and represents the percent reduction in the nominal frequency that will
generate a valid key press in software. Default value is 6%.
SCANTIME=xxMS
xx is the number of milliseconds used by the microprocessor to scan for one key press. If utilizing multiple
touch pads, each pad will use xx milliseconds to scan for one key press. Default is 32ms.
PIN=char
If a valid key press is determined on “PIN”, the software will return the character “char” in the function
touchpad_getc(). (Example: PIN_B0='A')
SOURCETIME=xxus (CTMU only)
xx is thenumber of microseconds each pin is sampled for by ADC during each scan time period. Default is
10us.
Purpose:
This directive will tell the compiler to initialize and activate the Capacitive Sensing Module (CSM)or Charge
Time Measurement Unit (CTMU) on the microcontroller. The compiler requires use of the TIMER0 and
TIMER1 modules for CSM and Timer1 ADC modules for CTMU, and global interrupts must still be activated
in the main program in order for the CSM or CTMU to begin normal operation. For most applications, a higher
RANGE, lower THRESHOLD, and higher SCANTIME will result better key press detection. Multiple PIN's
may be declared in “options”, but they must be valid pins used by the CSM or CTMU. The user may also
generate a TIMER0 ISR with TIMER0's interrupt occuring every SCANTIME milliseconds. In this case, the
CSM's or CTMU's ISR will be executed first.
Examples:
#USE TOUCHPAD (THRESHOLD=5, PIN_D5='5', PIN_B0='C')
void main(void){
char c;
enable_interrupts(GLOBAL);
while(1){
c = TOUCHPAD_GETC();
}
}
Example
Files:
Also See:
112
//will wait until a pin is detected
//if PIN_B0 is pressed, c will have 'C'
//if PIN_D5 is pressed, c will have '5'
None
touchpad_state( ), touchpad_getc( ), touchpad_hit( )
PreProcessor
#warning
Syntax:
#WARNING text
Elements:
text is optional and may be any text
Purpose:
Forces the compiler to generate a warning at the location this directive appears in the file. The
text may include macros that will be expanded for the display. This may be used to see the
macro expansion. The command may also be used to alert the user to an invalid compile time
situation.
To prevent the warning from being counted as a warning, use this syntax: #warning/information
text
Examples:
#if BUFFER_SIZE < 32
#warning Buffer Overflow may occur
#endif
Example Files:
ex_psp.c
Also See:
#ERROR
#word
Syntax:
#WORD id = x
Elements:
id is a valid C identifier,
x is a C variable or a constant
Purpose:
If the id is already known as a C variable then this will locate the variable at address x. In this case the
variable type does not change from the original definition. If the id is not known a new C variable is created
and placed at address x with the type int16
Warning: In both cases memory at x is not exclusive to this variable. Other variables may be located at the
same location. In fact when x is a variable, then id and x share the same memory location.
Examples:
#word data = 0x0800
struct {
int lowerByte : 8;
int upperByte : 8;
} control_word;
#word control_word = 0x85
...
control_word.upperByte = 0x42;
Example
Files:
Also See:
None
#bit, #byte, #locate, #reserve, Named Registers, Type Specifiers, Type Qualifiers, Enumerated Types,
Structures & Unions, Typedef
113
CCSC_March 2015-1
#zero_ram
Syntax:
#ZERO_RAM
Elements:
None
Purpose:
This directive zero's out all of the internal registers that may be used to hold variables before program
execution begins.
Examples:
#zero_ram
void main() {
}
Example
Files:
Also See:
114
ex_cust.c
None
BUILT-IN FUNCTIONS
BUILT-IN FUNCTIONS
The CCS compiler provides a lot of built-in functions to access and use the PIC microcontroller's peripherals. This
makes it very easy for the users to configure and use the peripherals without going into in depth details of the
registers associated with the functionality. The functions categorized by the peripherals associated with them are
listed on the next page. Click on the function name to get a complete description and parameter and return value
descriptions.
RS232 I/O
SPI
TWO WIRE I/O
DISCRETE
I/O
PARALLEL
PORT
I2C I/O
PROCESSOR
CONTROLS
assert( )
getch( )
putc( )
fgetc( )
getchar( )
putchar( )
fgets( )
gets( )
puts( )
fprintf( )
kbhit( )
setup_uart( )
ftc( )
perror( )
set_uart_speed( )
fputs( )
getc( )
printf( )
setup_spi( )
setup_spi2( )
spi_xfer( )
spi_init()
spi_data_is_in( )
spi_data_is_in2( )
spi_read( )
spi_read2( )
spi_write( )
spi_write2( )
get_tris_x( )
input( )
input_state( )
set_tris_x( )
output_X( )
output_bit( )
input_change_x( )
output_drive( )
output_low( )
output_toggle( )
set_pullup( )
input_x( )
output_high( )
output_float( )
psp_input_full( )
psp_output_full( )
psp_overflow( )
setup_psp(option, address_mask)
a
i2c_isr_state( )
i2c_poll( )
i2c_read( )
i2c_slaveaddr( )
i2c_start( )
i2c_stop( )
i2c_write( )
i2c_speed( )
i2c_init( )
clear_interrupt( )
disable_interrupts( )
enable_interrupts( )
ext_int_edge( )
getenv( )
brownout_enable( )
goto_address( )
interrupt_active( )
jump_to_isr( )
label_address( )
read_bank( )
a
reset_cpu( )
restart_cause( )
setup_oscillator( )
sleep( )
write_bank( )
a
115
CCSC_March 2015-1
BIT / BYTE
MANIPULATION
STANDARD C
MATH
VOLTAGE
REF/COMP
A/D
CONVERSION
STANDARD C
CHAR/STRING
116
bit_clear( )
bit_set( )
shift_left( )
bit_test( )
make8( )
make16( )
shift_right( )
make32( )
_mul( )
rotate_left( )
swap( )
rotate_right( )
abs( )
acos( )
asin( )
atan( )
atan2( )
atoe( )
ceil( )
cos( )
cosh( )
div( )
exp( )
fabs( )
floor( )
fmod( )
frexp( )
labs( )
ldexp( )
ldiv( )
log( )
log10( )
modf( )
pow( )
sin( )
sinh( )
sqrt( )
tan( )
tanh( )
setup_low_volt_detect( )
setup_vref()
set_adc_channel( )
setup_adc( )
adc_done( )
setup_adc_ports( )
atof( )
isxdigit(char)
strncpy( )
atoi( )
itoa( )
strpbrk( )
atol32( )
sprintf( )
strcopy( )
atol( )
strcat( )
strrchr( )
isalnum( )
strchr( )
strspn( )
isalpha(char)
strcmp( )
strstr( )
isamong( )
strcoll( )
strtod( )
iscntrl(x)
strcpy( )
strtok( )
isdigit(char)
strcspn( )
strtol( )
isgraph(x)
strerror( )
strtoul( )
islower(char)
stricmp( )
strxfrm( )
isprint(x)
strlen( )
tolower( )
ispunct(x)
strlwr( )
toupper( )
read_adc( )
Built-in Functions
TIMERS
STANDARD C
MEMORY
isspace(char)
strncat( )
isupper(char)
strncmp( )
a
get_timer_x( )
set_timerx( )
setup_timer_0( )
setup_timer_1( )
setup_timer_2( )
setup_timer_3( )
setup_timer_4( )
setup_timer_5( )
setup_counters( )
restart_wdt( )
setup_wdt( )
set_rtcc( )
set_ticks( )
get_ticks( )
setup_timer_A( )
setup_timer_B( )
set_timerA( )
set_timerB( )
get_timerA( )
get_timerB( )
calloc( )
memcmp( )
offsetofbit( )
free( )
memcpy( )
realloc( )
longjmp( )
memmove( )
setjmp( )
malloc( )
memset( )
a
memchr( )
offsetof( )
a
setup_cwg( )
cwg_status( )
cwg_restart( )
set_pwmx_duty( )
setup_power_pwm_pins( )
setup_power_pwm( )
setup_pwmx( )
set_power_pwmx_duty( )
set_power_pwm_override()
setup_cog()
set_cog_blanking()
cog_status()
cog_restart()
set_cog_phase()
get_capture_event( )
setup_ccpx( )
setup_smtx()
smtx_read()
smtx_reset_timer()
smtx_start()
smtx_status()
smtx_stop()
smtx_update()
CAPTURE
COMPARE / PWMset_cog_dead_band()
smtx_write()
NON-VOLATILE
MEMORY
erase_eeprom( )
read_external_memory( )
write_eeprom( )
117
CCSC_March 2015-1
STANDARD C
SPECIAL
DELAYS
ANALOG
COMPARE
RTOS
erase_program_eeprom( )
read_program_eeprom( )
write_external_memory( )
read_calibration( )
read_program_memory( )
write_program_eeprom( )
read_configuration_memory
setup_external_memory( )
()
write_program_memory( )
read_eeprom( )
write_configuration_memory()
read_rom_memory()
bsearch( )
rand( )
va_end( )
nargs( )
srand( )
va_start( )
qsort( )
va_arg( )
a
delay_cycles( )
delay_ms( )
delay_us( )
rtos_await( )
rtos_msg_send( )
rtos_terminate( )
rtos_disable( )
rtos_overrun( )
rtos_wait( )
rtos_enable( )
rtos_run( )
rtos_yield( )
rtos_msg_poll( )
rtos_signal( )
a
rtos_msg_read( )
rtos_stats( )
a
lcd_contrast( )
lcd_load( )
lcd_symbol( )
setup_lcd( )
a
a
qei_get_count( )
qei_set_count( )
qei_status( )
setup_qei( )
a
a
setup_comparator( )
LCD
QEI
CONFIGURABLE
setup_clc( )
LOGIC CELL
NUMERICALLY
CONTROLLED
OSCILLATOR
118
setup_nco(_)
clcx_setup_input( )
get_nco_accumulator(_)
clcx_setup_gate( )
get_nco_inc_value(_)
Built-in Functions
set_nco_inc_value(_)
D/A
CONVERSION
REAL TIME
CLOCK
CALENDAR
CAPACITIVE
TOUCH PAD
MISC.
CRC
a
dac_write()
setup_dac()
rtc_read( )
setup_rtc( )
rtc_alarm_write( )
setup_rtc_alarm( )
touchpad_getc( )
touchpad_hit( )
setup_opamp1( )
setup_zdc()
crc_calc(mode)
crc_calc8( )
a
setup_opamp2( )
zcd_status()
rtc_alarm_read( )
touchpad_state( )
sleep_ulpwu( )
crc_init(mode)
crc_calc16( )
abs( )
Syntax:
value = abs(x)
Parameters:
x is a signed 8, 16, or 32 bit int or a float
Returns:
Same type as the parameter.
Function:
Computes the absolute value of a number.
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
signed int target,actual;
...
119
CCSC_March 2015-1
error = abs(target-actual);
Example Files:
None
Also See:
labs()
sin( ) cos( ) tan( ) asin( ) acos() atan() sinh() cosh() tanh()
atan2()
Syntax:
val = sin (rad)
val = cos (rad)
val = tan (rad)
rad = asin (val)
rad1 = acos (val)
rad = atan (val)
rad2=atan2(val, val)
result=sinh(value)
result=cosh(value)
result=tanh(value)
Parameters:
rad is a float representing an angle in Radians -2pi to 2pi.
val is a float with the range -1.0 to 1.0.
Value is a float
Returns:
rad is a float representing an angle in Radians -pi/2 to pi/2
val is a float with the range -1.0 to 1.0.
rad1 is a float representing an angle in Radians 0 to pi
rad2 is a float representing an angle in Radians -pi to pi
Result is a float
Function:
These functions perform basic Trigonometric functions.
sin
returns the sine value of the parameter (measured in radians)
cos
returns the cosine value of the parameter (measured in radians)
tan
returns the tangent value of the parameter (measured in radians)
asin
returns the arc sine value in the range [-pi/2,+pi/2] radians
acos
returns the arc cosine value in the range[0,pi] radians
atan
returns the arc tangent value in the range [-pi/2,+pi/2] radians
atan2 returns the arc tangent of y/x in the range [-pi,+pi] radians
sinh
returns the hyperbolic sine of x
cosh returns the hyperbolic cosine of x
tanh
returns the hyperbolic tangent of x
Note on error handling:
If "errno.h" is included then the domain and range errors are stored in the errno variable. The user can
check the errno to see if an error has occurred and print the error using the perror function.
Domain error occurs in the following cases:
asin: when the argument not in the range[-1,+1]
acos: when the argument not in the range[-1,+1]
atan2: when both arguments are zero
Range error occur in the following cases:
cosh: when the argument is too large
120
Built-in Functions
sinh: when the argument is too large
Availability:
All devices
Requires:
#INCLUDE <math.h>
Examples:
float phase;
// Output one sine wave
for(phase=0; phase<2*3.141596; phase+=0.01)
set_analog_voltage( sin(phase)+1 );
Example
Files:
Also See:
ex_tank.c
log(), log10(), exp(), pow(), sqrt()
adc_done( )
Syntax:
value = adc_done();
Parameters:
None
Returns:
A short int. TRUE if the A/D converter is done with conversion, FALSE if it is still busy.
Function:
Can be polled to determine if the A/D has valid data.
Availability:
Only available on devices with built in analog to digital converters
Requires:
None
Examples:
int16 value;
setup_adc_ports(sAN0|sAN1, VSS_VDD);
setup_adc(ADC_CLOCK_DIV_4|ADC_TAD_MUL_8);
set_adc_channel(0);
read_adc(ADC_START_ONLY);
int1 done = adc_done();
while(!done) {
done = adc_done();
}
value = read_adc(ADC_READ_ONLY);
printf(“A/C value = %LX\n\r”, value);
}
Example
Files:
Also See:
None
setup_adc(), set_adc_channel(), setup_adc_ports(), read_adc(), ADC Overview
assert( )
Syntax:
assert (condition);
Parameters:
condition is any relational expression
121
CCSC_March 2015-1
Returns:
Nothing
Function:
This function tests the condition and if FALSE will generate an error message on STDERR (by
default the first USE RS232 in the program). The error message will include the file and line of
the assert(). No code is generated for the assert() if you #define NODEBUG. In this way you
may include asserts in your code for testing and quickly eliminate them from the final program.
Availability:
All devices
Requires:
assert.h and #USE RS232
Examples:
assert( number_of_entries<TABLE_SIZE );
// If number_of_entries is >= TABLE_SIZE then
// the following is output at the RS232:
// Assertion failed, file myfile.c, line 56
Example
Files:
Also See:
None
#USE RS232, RS232 I/O Overview
atoe
Syntax:
atoe(string);
Parameters:
string is a pointer to a null terminated string of characters.
Returns:
Result is a floating point number
Function:
Availability:
Converts the string passed to the function into a floating point representation. If
the result cannot be represented, the behavior is undefined. This function also
handles E format numbers
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
char string [10];
float32 x;
strcpy (string, "12E3");
x = atoe(string);
// x is now 12000.00
Example
Files:
Also See:
None
atoi(), atol(), atoi32(), atof(), printf()
atof( )
Syntax:
result = atof (string)
Parameters:
string is a pointer to a null terminated string of characters.
122
Built-in Functions
Returns:
Result is a floating point number
Function:
Converts the string passed to the function into a floating point representation. If the result
cannot be represented, the behavior is undefined.
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
char string [10];
float x;
strcpy (string, "123.456");
x = atof(string);
// x is now 123.456
Example
Files:
Also See:
ex_tank.c
atoi(), atol(), atoi32(), printf()
pin_select()
Syntax:
pin_select(peripheral_pin, pin, [unlock],[lock])
Parameters:
peripheral_pin – a constant string specifying which peripheral pin to map the specified pin to.
Refer to #pin_select for all available strings. Using “NULL” for the peripheral_pin parameter will
unassign the output peripheral pin that is currently assigned to the pin passed for the pin
parameter.
pin – the pin to map to the specified peripheral pin. Refer to device's header file for pin defines.
If the peripheral_pin parameter is an input, passing FALSE for the pin parameter will unassign
the pin that is currently assigned to that peripheral pin.
unlock – optional parameter specifying whether to perform an unlock sequence before writing the
RPINRx or RPORx register register determined by peripheral_pin and pin options. Default is
TRUE if not specified. The unlock sequence must be performed to allow writes to the RPINRx
and RPORx registers. This option allows calling pin_select() multiple times without performing an
unlock sequence each time.
Returns:
lock – optional parameter specifying whether to perform a lock sequence after writing the
RPINRx or RPORx registers. Default is TRUE if not specified. Although not necessary it is a
good idea to lock the RPINRx and RPORx registers from writes after all pins have been mapped.
This option allows calling pin_select() multiple times without performing a lock sequence each
time.
Nothing.
Availability:
Requires:
Examples:
On device with remappable peripheral pins.
Pin defines in device's header file.
pin_select(“U2TX”,PIN_B0);
//Maps PIN_B0 to U2TX //peripheral pin, performs unlock //and lock sequences.
pin_select(“U2TX”,PIN_B0,TRUE,FALSE);
//Maps PIN_B0 to U2TX //peripheral pin and performs //unlock sequence.
pin_select(“U2RX”,PIN_B1,FALSE,TRUE);
//Maps PIN_B1 to U2RX //peripheral pin and performs lock //sequence.
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Example Files:
Also See:
None.
#pin_select
atoi( ) atol( ) atoi32( )
Syntax:
ivalue = atoi(string)
or
lvalue = atol(string)
or
i32value = atoi32(string)
Parameters:
string is a pointer to a null terminated string of characters.
Returns:
ivalue is an 8 bit int.
lvalue is a 16 bit int.
i32value is a 32 bit int.
Function:
Converts the string passed to the function into an int representation. Accepts both decimal
and hexadecimal argument. If the result cannot be represented, the behavior is undefined.
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
char string[10];
int x;
strcpy(string,"123");
x = atoi(string);
// x is now 123
Example
Files:
Also See:
input.c
printf()
bit_clear( )
Syntax:
bit_clear(var, bit)
Parameters:
var may be a any bit variable (any lvalue)
bit is a number 0- 31 representing a bit number, 0 is the least significant bit.
Returns:
undefined
Function:
Simply clears the specified bit (0-7, 0-15 or 0-31) in the given variable. The least significant
bit is 0. This function is the similar to: var &= ~(1<<bit);
Availability:
All devices
Requires:
Nothing
Examples:
int x;
124
Built-in Functions
x=5;
bit_clear(x,2);
// x is now 1
Example
Files:
Also See:
ex_patg.c
bit_set(), bit_test()
bit_set( )
Syntax:
bit_set(var, bit)
Parameters:
var may be a 8,16 or 32 bit variable (any lvalue)
bit is a number 0- 31 representing a bit number, 0 is the least significant bit.
Returns:
Undefined
Function:
Sets the specified bit (0-7, 0-15 or 0-31) in the given variable. The least significant bit is 0. This
function is the similar to: var |= (1<<bit);
Availability:
All devices
Requires:
Nothing
Examples:
int x;
x=5;
bit_set(x,3);
// x is now 13
Example Files:
ex_patg.c
Also See:
bit_clear(), bit_test()
bit_test( )
Syntax:
value = bit_test (var, bit)
Parameters:
var may be a 8,16 or 32 bit variable (any lvalue)
bit is a number 0- 31 representing a bit number, 0 is the least significant bit.
Returns:
0 or 1
Function:
Tests the specified bit (0-7,0-15 or 0-31) in the given variable. The least significant bit is 0. This function is
much more efficient than, but otherwise similar to:
((var & (1<<bit)) != 0)
Availability:
All devices
Requires:
Nothing
Examples:
if( bit_test(x,3) || !bit_test (x,1) ){
//either bit 3 is 1 or bit 1 is 0
}
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if(data!=0)
for(i=31;!bit_test(data, i);i--) ;
// i now has the most significant bit in data
// that is set to a 1
Example
Files:
ex_patg.c
Also See:
bit_clear(), bit_set()
brownout_enable( )
Syntax:
brownout_enable (value)
Parameters:
value – TRUE or FALSE
Returns:
undefined
Function:
Enable or disable the software controlled brownout. Brownout will cause the PIC to reset if the
power voltage goes below a specific set-point.
Availability:
This function is only available on PICs with a software controlled brownout. This may also require
a specific configuration bit/fuse to be set for the brownout to be software controlled.
Requires:
Nothing
Examples:
brownout_enable(TRUE);
Example Files:
None
Also See:
restart_cause()
bsearch( )
Syntax:
ip = bsearch (&key, base, num, width, compare)
Parameters:
key: Object to search for
base: Pointer to array of search data
num: Number of elements in search data
width: Width of elements in search data
compare: Function that compares two elements in search data
Returns:
bsearch returns a pointer to an occurrence of key in the array pointed to by base. If key is not
found, the function returns NULL. If the array is not in order or contains duplicate records with
identical keys, the result is unpredictable.
Function:
Performs a binary search of a sorted array
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
126
Built-in Functions
Examples:
int nums[5]={1,2,3,4,5};
int compar(const void *arg1,const void *arg2);
void main() {
int *ip, key;
key = 3;
ip = bsearch(&key, nums, 5, sizeof(int), compar);
}
int compar(const void *arg1,const void *arg2) {
if ( * (int *) arg1 < ( * (int *) arg2) return –1
else if ( * (int *) arg1 == ( * (int *) arg2) return 0
else return 1;
}
Example Files:
None
Also See:
qsort()
calloc( )
Syntax:
ptr=calloc(nmem, size)
Parameters:
nmem is an integer representing the number of member objects
size is the number of bytes to be allocated for each one of them.
Returns:
A pointer to the allocated memory, if any. Returns null otherwise.
Function:
The calloc function allocates space for an array of nmem objects whose size is specified by size.
The space is initialized to all bits zero.
Availability:
All devices
Requires:
#INCLUDE <stdlibm.h>
Examples:
int * iptr;
iptr=calloc(5,10);
// iptr will point to a block of memory of
// 50 bytes all initialized to 0.
Example Files:
None
Also See:
realloc(), free(), malloc()
ceil( )
Syntax:
result = ceil (value)
Parameters:
value is a float
Returns:
A float
Function:
Computes the smallest integer value greater than the argument. CEIL(12.67) is 13.00.
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Availability:
All devices
Requires:
#INCLUDE<math.h>
Examples:
// Calculate cost based on weight rounded
// up to the next pound
cost = ceil( weight ) * DollarsPerPound;
Example Files:
None
Also See:
floor()
clc1_setup_gate() clc2_setup_gate() clc3_setup_gate()
clc4_setup_gate()
Syntax:
clc1_setup_gate(gate, mode);
clc2_setup_gate(gate, mode);
clc3_setup_gate(gate, mode);
clc4_setup_gate(gate, mode);
Parameters:
gate – selects which data gate of the Configurable Logic Cell (CLC) module to setup,
value can be 1 to 4.
mode – the mode to setup the specified data gate of the CLC module into. The
options are:
CLC_GATE_AND
CLC_GATE_NAND
CLC_GATE_NOR
CLC_GATE_OR
CLC_GATE_CLEAR
CLC_GATE_SET
Returns:
Undefined
Function:
Sets the logic function performed on the inputs for the specified data gate.
Availability:
On devices with a CLC module.
Returns:
Undefined.
Examples:
clc1_setup_gate(1,
clc1_setup_gate(2,
clc1_setup_gate(3,
clc1_setup_gate(4,
Example Files:
None
Also See:
setup_clcx(), clcx_setup_input()
128
CLC_GATE_AND);
CLC_GATE_NAND);
CLC_GATE_CLEAR);
CLC_GATE_SET);
Built-in Functions
clc1_setup_input() clc2_setup_input() clc3_setup_input()
clc4_setup_input()
Syntax:
clc1_setup_input(input, selection);
clc2_setup_input(input, selection);
clc3_setup_input(input, selection);
clc4_setup_input(input, selection);
Parameters:
input – selects which input of the Configurable Logic Cell (CLC) module to setup,
value can be 1 to 4.
selection – the actual input for the specified input that is actually connected to the data
gates of the CLC module. The options are:
CLC_INPUT_0
CLC_INPUT_1
CLC_INPUT_2
CLC_INPUT_3
CLC_INPUT_4
CLC_INPUT_5
CLC_INPUT_6
CLC_INPUT_7
Returns:
Undefined.
Function:
Sets the input for the specified input number that is actually connected to all four data
gates of the CLC module. Please refer to the table CLCx DATA INPUT SELECTION in
the device's datasheet to determine which of the above selections corresponds to
actual input pin or peripheral of the device.
Availability:
On devices with a CLC module.
Returns:
Undefined.
Examples:
clc1_setup_input(1,
clc1_setup_input(2,
clc1_setup_input(3,
clc1_setup_input(4,
Example Files:
None
Also See:
setup_clcx(), clcx_setup_gate()
CLC_INPUT_0);
CLC_INPUT_1);
CLC_INPUT_2);
CLC_INPUT_3);
clear_interrupt( )
Syntax:
clear_interrupt(level)
Parameters:
level - a constant defined in the devices.h file
Returns:
undefined
Function:
Clears the interrupt flag for the given level. This function is designed for use with a specific interrupt,
thus eliminating the GLOBAL level as a possible parameter. Some chips that have interrupt on
change for individual pins allow the pin to be specified like INT_RA1.
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Availability:
All devices
Requires:
Nothing
Examples:
clear_interrupt(int_timer1);
Example Files:
None
Also See:
enable_interrupts() , #INT , Interrupts Overview
disable_interrupts(), interrupt_actvie()
cog_status( )
Syntax:
value=cog_status();
Parameters:
None
Returns:
Function:
value - the status of the COG module
To determine if a shutdown event occurred on the Complementary Output Generator
(COG) module.
All devices with a COG module.
Availability:
Examples:
if(cog_status()==COG_AUTO_SHUTDOWN)
cog_restart();
Example Files:
None
Also See:
setup_cog(), set_cog_dead_band(), set_cog_blanking(), set_cog_phase(), cog_restart()
.
cog_restart( )
Syntax:
cog_restart();
Parameters:
None
Returns:
Function:
Nothing
To restart the Complementary Output Generator (COG) module after an auto-shutdown
event occurs, when not using auto-restart option of module.
All devices with a COG module.
Availability:
Examples:
if(cog_status()==COG_AUTO_SHUTDOWN)
cog_restart();
Example Files:
None
Also See:
setup_cog(), set_cog_dead_band(), set_cog_blanking(), set_cog_phase(), cog_status()
130
Built-in Functions
crc_calc( )
crc_calc8( )
crc_calc16( )
Syntax:
Parameters:
Result = crc_calc (data,[width]);
Result = crc_calc(ptr,len,[width]);
Result = crc_calc8(data,[width]);
Result = crc_calc8(ptr,len,[width]);
Result = crc_calc16(data,[width]);
Result = crc_calc16(ptr,len,[width]);
//same as crc_calc( )
//same as crc_calc( )
data- This is one double word, word or byte that needs to be processed when using
crc_calc16( ), or crc_calc8( )
ptr- is a pointer to one or more double words, words or bytes of data
len- number of double words, words or bytes to process for function calls
crc_calc16( ), or crc_calc8( )
width- optional parameter used to specify the input data bit width to use with the functions
crc_calc16( ), and crc_calc8( )
If not specified, it defaults to the width of the return value of the function, 8-bit for crc_calc8( ), 16-bit
for crc_calc16( )
For devices with a 16-bit for CRC the input data bit width is the same as the return bit width,
crc_calc16( ) and 8-bit crc_calc8( ).
Returns:
Returns the result of the final CRC calculation.
Function:
This will process one data double word, word or byte or len double words, words or bytes of data
using the CRC engine.
Availability:
Only the devices with built in CRC module.
Requires:
Nothing
Examples:
int16 data[8];
Result = crc_calc(data,8);
Example Files:
None
Also See:
setup_crc(); crc_init()
crc_init(mode)
Syntax:
crc_init (data);
Parameters:
data - This will setup the initial value used by write CRC shift register. Most commonly, this register
is set to 0x0000 for start of a new CRC calculation.
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Returns:
undefined
Function:
Configures the CRCWDAT register with the initial value used for CRC calculations.
Availability:
Only the devices with built in CRC module.
Requires:
Nothing
Examples:
crc_init (); // Starts the CRC accumulator out at 0
crc_init(0xFEEE); // Starts the CRC accumulator out at 0xFEEE
Example Files:
None
Also See:
setup_crc(), crc_calc(), crc_calc8()
cwg_status( )
Syntax:
value = cwg_status( );
Parameters:
None
Returns:
the status of the CWG module
Function:
To determine if a shutdown event occured causing the module to auto-shutdown
Availability:
On devices with a CWG module.
Examples:
if(cwg_status( ) == CWG_AUTO_SHUTDOWN)
cwg_restart( );
Example
Files:
Also See:
None
setup_cwg( ), cwg_restart( )
cwg_restart( )
Syntax:
cwg_restart( );
Parameters:
None
Returns:
Nothing
Function:
To restart the CWG module after an auto-shutdown event occurs, when not using
auto-raster option of module.
Availability:
On devices with a CWG module.
Examples:
if(cwg_status( ) == CWG_AUTO_SHUTDOWN)
cwg_restart( );
Example
None
132
Built-in Functions
Files:
Also See:
setup_cwg( ), cwg_status( )
dac_write( )
Syntax:
dac_write (value)
Parameters:
Value: 8-bit integer value to be written to the DAC module
Returns:
undefined
Function:
This function will write a 8-bit integer to the specified DAC channel.
Availability:
Only available on devices with built in digital to analog converters.
Requires:
Nothing
Examples:
int i = 0;
setup_dac(DAC_VDD | DAC_OUTPUT);
while(1){
i++;
dac_write(i);
}
Also See:
setup_dac( ), DAC Overview, see header file for device selected
delay_cycles( )
Syntax:
delay_cycles (count)
Parameters:
count - a constant 1-255
Returns:
undefined
Function:
Creates code to perform a delay of the specified number of instruction clocks (1-255). An
instruction clock is equal to four oscillator clocks.
The delay time may be longer than requested if an interrupt is serviced during the delay. The time
spent in the ISR does not count toward the delay time.
Availability:
All devices
Requires:
Nothing
Examples:
delay_cycles( 1 ); // Same as a NOP
delay_cycles(25); // At 20 mhz a 5us delay
Example Files:
ex_cust.c
Also See:
delay_us(), delay_ms()
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delay_ms( )
Syntax:
delay_ms (time)
Parameters:
time - a variable 0-65535(int16) or a constant 0-65535
Note: Previous compiler versions ignored the upper byte of an int16, now the upper byte affects
the time.
Returns:
undefined
Function:
This function will create code to perform a delay of the specified length. Time is specified in
milliseconds. This function works by executing a precise number of instructions to cause the
requested delay. It does not use any timers. If interrupts are enabled the time spent in an
interrupt routine is not counted toward the time.
The delay time may be longer than requested if an interrupt is serviced during the delay. The
time spent in the ISR does not count toward the delay time.
Availability:
All devices
Requires:
#USE DELAY
Examples:
#use delay (clock=20000000)
delay_ms( 2 );
void delay_seconds(int n) {
for (;n!=0; n- -)
delay_ms( 1000 );
}
Example Files:
ex_sqw.c
Also See:
delay_us(), delay_cycles(), #USE DELAY
delay_us( )
Syntax:
delay_us (time)
Parameters:
time - a variable 0-65535(int16) or a constant 0-65535
Note: Previous compiler versions ignored the upper byte of an int16, now the upper byte affects
the time.
Returns:
undefined
Function:
Creates code to perform a delay of the specified length. Time is specified in
microseconds. Shorter delays will be INLINE code and longer delays and variable delays are
calls to a function. This function works by executing a precise number of instructions to cause
the requested delay. It does not use any timers. If interrupts are enabled the time spent in an
interrupt routine is not counted toward the time.
134
Built-in Functions
The delay time may be longer than requested if an interrupt is serviced during the delay. The
time spent in the ISR does not count toward the delay time.
Availability:
All devices
Requires:
#USE DELAY
Examples:
#use delay(clock=20000000)
do {
output_high(PIN_B0);
delay_us(duty);
output_low(PIN_B0);
delay_us(period-duty);
} while(TRUE);
Example Files:
ex_sqw.c
Also See:
delay_ms(), delay_cycles(), #USE DELAY
disable_interrupts( )
Syntax:
disable_interrupts (level)
Parameters:
level - a constant defined in the devices .h file
Returns:
undefined
Function:
Disables the interrupt at the given level. The GLOBAL level will not disable any of the specific
interrupts but will prevent any of the specific interrupts, previously enabled to be active. Valid
specific levels are the same as are used in #INT_xxx and are listed in the devices .h
file. GLOBAL will also disable the peripheral interrupts on devices that have it. Note that it is not
necessary to disable interrupts inside an interrupt service routine since interrupts are
automatically disabled. Some chips that have interrupt on change for individual pins allow the
pin to be specified like INT_RA1.
Availability:
Device with interrupts (PCM and PCH)
Requires:
Should have a #INT_xxxx, constants are defined in the devices .h file.
Examples:
disable_interrupts(GLOBAL); // all interrupts OFF
disable_interrupts(INT_RDA); // RS232 OFF
enable_interrupts(ADC_DONE);
enable_interrupts(RB_CHANGE);
// these enable the interrupts
// but since the GLOBAL is disabled they
// are not activated until the following
// statement:
enable_interrupts(GLOBAL);
Example Files:
ex_sisr.c, ex_stwt.c
Also See:
enable_interrupts(), clear_interrupt (), #INT_xxxx, Interrupts Overview, interrupt_active()
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div( ) ldiv( )
Syntax:
idiv=div(num, denom)
ldiv =ldiv(lnum, ldenom)
Parameters:
num and denom are signed integers.
num is the numerator and denom is the denominator.
lnum and ldenom are signed longs
lnum is the numerator and ldenom is the denominator.
Returns:
idiv is a structure of type div_t and lidiv is a structure of type ldiv_t. The div function returns a
structure of type div_t, comprising of both the quotient and the remainder. The ldiv function
returns a structure of type ldiv_t, comprising of both the quotient and the remainder.
Function:
The div and ldiv function computes the quotient and remainder of the division of the numerator by
the denominator. If the division is inexact, the resulting quotient is the integer or long of lesser
magnitude that is the nearest to the algebraic quotient. If the result cannot be represented, the
behavior is undefined; otherwise quot*denom(ldenom)+rem shall equal num(lnum).
Availability:
All devices.
Requires:
#INCLUDE <STDLIB.H>
Examples:
div_t idiv;
ldiv_t lidiv;
idiv=div(3,2);
//idiv will contain quot=1 and rem=1
lidiv=ldiv(300,250);
//lidiv will contain lidiv.quot=1 and lidiv.rem=50
Example Files:
None
Also See:
None
enable_interrupts( )
Syntax:
enable_interrupts (level)
Parameters:
level is a constant defined in the devices *.h file.
Returns:
undefined.
Function:
This function enables the interrupt at the given level. An interrupt procedure should have been
defined for the indicated interrupt.
The GLOBAL level will not enable any of the specific interrupts, but will allow any of the
specified interrupts previously enabled to become active. Some chips that have an interrupt on
change for individual pins all the pin to be specified, such as INT_RA1. For interrupts that use
edge detection to trigger, it can be setup in the enable_interrupts( ) function without making a
separate call to the set_int_edge( ) function.
Enabling interrupts does not clear the interrupt flag if there was a pending interrupt prior to the
call. Use the clear_interrupt( ) function to clear pending interrupts before the call to
enable_interrupts( ) to discard the prior interrupts.
Availability:
136
Devices with interrupts.
Built-in Functions
Requires:
Should have a #INT_XXXX to define the ISR, and constants are defined in the devices *.h file.
Examples:
enable_interrupts(GLOBAL);
enable_interrupts(INT_TIMER0);
enable_interrupts( INT_EXT_H2L );
Example Files:
Also See:
ex_sisr.c, ex_stwt.c
disable interrupts(), clear_interrupt (), ext_int_edge( ), #INT_xxxx, Interrupts Overview,
interrupt_active()
erase_eeprom( )
Syntax:
erase_eeprom (address);
Parameters:
address is 8 bits on PCB parts.
Returns:
undefined
Function:
This will erase a row of the EEPROM or Flash Data Memory.
Availability:
PCB devices with EEPROM like the 12F519
Requires:
Nothing
Examples:
erase_eeprom(0);
Example Files:
None
Also See:
write program eeprom(), write program memory(), Program Eeprom Overview
// erase the first row of the EEPROM (8
bytes)
exp( )
Syntax:
result = exp (value)
Parameters:
value is a float
Returns:
A float
Function:
Computes the exponential function of the argument. This is e to the power of value where e is the
base of natural logarithms. exp(1) is 2.7182818.
Note on error handling:
If "errno.h" is included then the domain and range errors are stored in the errno variable. The user
can check the errno to see if an error has occurred and print the error using the perror function.
Range error occur in the following case:
 exp: when the argument is too large
Availability:
All devices
137
CCSC_March 2015-1
Requires:
#INCLUDE <math.h>
Examples:
// Calculate x to the power of y
x_power_y = exp( y * log(x) );
Example Files:
None
Also See:
pow(), log(), log10()
ext_int_edge( )
Syntax:
ext_int_edge (source, edge)
Parameters:
source is a constant 0,1 or 2 for the PIC18XXX and 0 otherwise.
Source is optional and defaults to 0.
edge is a constant H_TO_L or L_TO_H representing "high to low" and "low to high"
Returns:
undefined
Function:
Determines when the external interrupt is acted upon. The edge may be L_TO_H or H_TO_L to
specify the rising or falling edge.
Availability:
Only devices with interrupts (PCM and PCH)
Requires:
Constants are in the devices .h file
Examples:
ext_int_edge( 2, L_TO_H); // Set up PIC18 EXT2
ext_int_edge( H_TO_L );
// Sets up EXT
Example Files:
ex_wakup.c
Also See:
#INT_EXT , enable_interrupts() , disable_interrupts() , Interrupts Overview
fabs( )
Syntax:
result=fabs (value)
Parameters:
value is a float
Returns:
result is a float
Function:
The fabs function computes the absolute value of a float
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
float result;
result=fabs(-40.0)
// result is 40.0
Example Files:
None
138
Built-in Functions
Also See:
abs(), labs()
getc( ) getch( ) getchar( ) fgetc( )
Syntax:
value = getc()
value = fgetc(stream)
value=getch()
value=getchar()
Parameters:
stream is a stream identifier (a constant byte)
Returns:
An 8 bit character
Function:
This function waits for a character to come in over the RS232 RCV pin and returns the character. If you do
not want to hang forever waiting for an incoming character use kbhit() to test for a character available. If a
built-in USART is used the hardware can buffer 3 characters otherwise GETC must be active while the
character is being received by the PIC®.
If fgetc() is used then the specified stream is used where getc() defaults to STDIN (the last USE RS232).
Availability:
All devices
Requires:
#USE RS232
Examples:
printf("Continue (Y,N)?");
do {
answer=getch();
}while(answer!='Y' && answer!='N');
#use rs232(baud=9600,xmit=pin_c6,
rcv=pin_c7,stream=HOSTPC)
#use rs232(baud=1200,xmit=pin_b1,
rcv=pin_b0,stream=GPS)
#use rs232(baud=9600,xmit=pin_b3,
stream=DEBUG)
...
while(TRUE) {
c=fgetc(GPS);
fputc(c,HOSTPC);
if(c==13)
fprintf(DEBUG,"Got a CR\r\n");
}
Example
Files:
Also See:
ex_stwt.c
putc(), kbhit(), printf(), #USE RS232, input.c, RS232 I/O Overview
gets( ) fgets( )
Syntax:
gets (string)
value = fgets (string, stream)
Parameters:
string is a pointer to an array of characters.
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CCSC_March 2015-1
Stream is a stream identifier (a constant byte)
Returns:
undefined
Function:
Reads characters (using getc()) into the string until a RETURN (value 13) is encountered. The
string is terminated with a 0. Note that INPUT.C has a more versatile get_string function.
If fgets() is used then the specified stream is used where gets() defaults to STDIN (the last USE
RS232).
Availability:
All devices
Requires:
#USE RS232
Examples:
char string[30];
printf("Password: ");
gets(string);
if(strcmp(string, password))
printf("OK");
Example Files:
None
Also See:
getc(), get_string in input.c
floor( )
Syntax:
result = floor (value)
Parameters:
value is a float
Returns:
result is a float
Function:
Computes the greatest integer value not greater than the argument. Floor (12.67) is 12.00.
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
// Find the fractional part of a value
frac = value - floor(value);
Example Files:
None
Also See:
ceil()
fmod( )
Syntax:
result= fmod (val1, val2)
Parameters:
val1 is a float
val2 is a float
140
Built-in Functions
Returns:
result is a float
Function:
Returns the floating point remainder of val1/val2. Returns the value val1 - i*val2 for some integer
“i” such that, if val2 is nonzero, the result has the same sign as val1 and magnitude less than the
magnitude of val2.
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
float result;
result=fmod(3,2);
// result is 1
Example Files:
None
Also See:
None
printf( ) fprintf( )
Syntax:
printf (string)
or
printf (cstring, values...)
or
printf (fname, cstring, values...)
fprintf (stream, cstring, values...)
Parameters:
String is a constant string or an array of characters null terminated.
Values is a list of variables separated by commas, fname is a function name to be used for
outputting (default is putc is none is specified.
Stream is a stream identifier (a constant byte). Note that format specifies do not work in ram
band strings.
Returns:
undefined
Function:
Outputs a string of characters to either the standard RS-232 pins (first two forms) or to a specified
function. Formatting is in accordance with the string argument. When variables are used this
string must be a constant. The % character is used within the string to indicate a variable value is
to be formatted and output. Longs in the printf may be 16 or 32 bit. A %% will output a single
%. Formatting rules for the % follows.
See the Expressions > Constants and Trigraph sections of this manual for other escape character
that may be part of the string.
If fprintf() is used then the specified stream is used where printf() defaults to STDOUT (the last
USE RS232).
Format:
The format takes the generic form %nt. n is optional and may be 1-9 to specify how many
characters are to be outputted, or 01-09 to indicate leading zeros, or 1.1 to 9.9 for floating point
and %w output. t is the type and may be one of the following:
c
Character
s
String or character
u
Unsigned int
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d
Lu
Ld
x
X
Lx
LX
f
g
e
w
Signed int
Long unsigned int
Long signed int
Hex int (lower case)
Hex int (upper case)
Hex long int (lower case)
Hex long int (upper case)
Float with truncated decimal
Float with rounded decimal
Float in exponential format
Unsigned int with decimal place inserted. Specify two
numbers for n. The first is a total field width. The
second is the desired number of decimal places.
Example formats:
Specifier
Value=0x12
%03u
018
%u
18
%2u
18
%5
18
%d
18
%x
12
%X
12
%4X
0012
%3.1w
1.8
* Result is undefined - Assume garbage.
Value=0xfe
254
254
*
254
-2
fe
FE
00FE
25.4
Availability:
All Devices
Requires:
#USE RS232 (unless fname is used)
Examples:
byte x,y,z;
printf("HiThere");
printf("RTCCValue=>%2x\n\r",get_rtcc());
printf("%2u %X %4X\n\r",x,y,z);
printf(LCD_PUTC, "n=%u",n);
Example Files:
ex_admm.c, ex_lcdkb.c
Also See:
atoi(), puts(), putc(), getc() (for a stream example), RS232 I/O Overview
putc( ) putchar( ) fputc( )
Syntax:
putc (cdata)
putchar (cdata)
fputc(cdata, stream)
Parameters:
cdata is a 8 bit character.
Stream is a stream identifier (a constant byte)
Returns:
undefined
Function:
This function sends a character over the RS232 XMIT pin. A #USE RS232 must appear before
this call to determine the baud rate and pin used. The #USE RS232 remains in effect until
another is encountered in the file.
If fputc() is used then the specified stream is used where putc() defaults to STDOUT (the last
142
Built-in Functions
USE RS232).
Availability:
All devices
Requires:
#USE RS232
Examples:
putc('*');
for(i=0; i<10; i++)
putc(buffer[i]);
putc(13);
Example Files:
ex_tgetc.c
Also See:
getc(), printf(), #USE RS232, RS232 I/O Overview
puts( ) fputs( )
Syntax:
puts (string).
fputs (string, stream)
Parameters:
string is a constant string or a character array (null-terminated).
Stream is a stream identifier (a constant byte)
Returns:
undefined
Function:
Sends each character in the string out the RS232 pin using putc(). After the string is sent a
CARRIAGE-RETURN (13) and LINE-FEED (10) are sent. In general printf() is more useful than
puts().
If fputs() is used then the specified stream is used where puts() defaults to STDOUT (the last
USE RS232)
Availability:
All devices
Requires:
#USE RS232
Examples:
puts( " ----------- " );
puts( " |
HI
| " );
puts( " ----------- " );
Example Files:
None
Also See:
printf(), gets(), RS232 I/O Overview
free( )
Syntax:
free(ptr)
Parameters:
ptr is a pointer earlier returned by the calloc, malloc or realloc.
Returns:
No value
Function:
The free function causes the space pointed to by the ptr to be deallocated, that is made available
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for further allocation. If ptr is a null pointer, no action occurs. If the ptr does not match a pointer
earlier returned by the calloc, malloc or realloc, or if the space has been deallocated by a call to
free or realloc function, the behavior is undefined.
Availability:
All devices.
Requires:
#INCLUDE <stdlibm.h>
Examples:
int * iptr;
iptr=malloc(10);
free(iptr)
// iptr will be deallocated
Example Files:
None
Also See:
realloc(), malloc(), calloc()
frexp( )
Syntax:
result=frexp (value, &exp);
Parameters:
value is a float
exp is a signed int.
Returns:
result is a float
Function:
The frexp function breaks a floating point number into a normalized fraction and an integral
power of 2. It stores the integer in the signed int object exp. The result is in the interval [1/2 to1)
or zero, such that value is result times 2 raised to power exp. If value is zero then both parts are
zero.
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
float result;
signed int exp;
result=frexp(.5,&exp);
// result is .5 and exp is 0
Example Files:
None
Also See:
ldexp(), exp(), log(), log10(), modf()
scanf( )
printf( )
Syntax:
144
scanf(cstring);
scanf(cstring, values...)
fscanf(stream, cstring, values...)
Built-in Functions
Parameters:
cstring is a constant string.
values is a list of variables separated by commas.
stream is a stream identifier.
Returns:
0 if a failure occurred, otherwise it returns the number of conversion specifiers that were read in, plus the
number of constant strings read in.
Function:
Reads in a string of characters from the standard RS-232 pins and formats the string according to the
format specifiers. The format specifier character (%) used within the string indicates that a conversion
specification is to be done and the value is to be saved into the corresponding argument variable. A %%
will input a single %. Formatting rules for the format specifier as follows:
If fscanf() is used, then the specified stream is used, where scanf() defaults to STDIN (the last USE RS232).
Format:
The format takes the generic form %nt. n is an option and may be 1-99 specifying the field width, the
number of characters to be inputted. t is the type and maybe one of the following:
c
Matches a sequence of characters of the number specified by the field width (1 if no field
width is specified). The corresponding argument shall be a pointer to the initial character
of an array long enough to accept the sequence.
s
Matches a sequence of non-white space characters. The corresponding argument shall be
a pointer to the initial character of an array long enough to accept the sequence and a
terminating null character, which will be added automatically.
u
Matches an unsigned decimal integer. The corresponding argument shall be a pointer to an
unsigned integer.
Lu
Matches a long unsigned decimal integer. The corresponding argument shall be a pointer to
a long unsigned integer.
d
Matches a signed decimal integer. The corresponding argument shall be a pointer to a
signed integer.
Ld
Matches a long signed decimal integer. The corresponding argument shall be a pointer to a
long signed integer.
o
Matches a signed or unsigned octal integer. The corresponding argument shall be a pointer
to a signed or unsigned integer.
Lo
Matches a long signed or unsigned octal integer. The corresponding argument shall be a
pointer to a long signed or unsigned integer.
x or X
Matches a hexadecimal integer. The corresponding argument shall be a pointer to a signed
or unsigned integer.
Lx or LX
Matches a long hexadecimal integer. The corresponding argument shall be a pointer to a
long signed or unsigned integer.
i
Matches a signed or unsigned integer. The corresponding argument shall be a pointer to a
signed or unsigned integer.
Li
Matches a long signed or unsigned integer. The corresponding argument shall be a pointer
to a long signed or unsigned integer.
f,g or e
Matches a floating point number in decimal or exponential format. The corresponding
argument shall be a pointer to a float.
[
Matches a non-empty sequence of characters from a set of expected characters. The
145
CCSC_March 2015-1
sequence of characters included in the set are made up of all character following the left
bracket ([) up to the matching right bracket (]). Unless the first character after the left
bracket is a ^, in which case the set of characters contain all characters that do not
appear between the brackets. If a - character is in the set and is not the first or second,
where the first is a ^, nor the last character, then the set includes all characters from the
character before the - to the character after the -.
For example, %[a-z] would include all characters from a to z in the set and %[^a-z] would
exclude all characters from a to z from the set. The corresponding argument shall be a
pointer to the initial character of an array long enough to accept the sequence and a
terminating null character, which will be added automatically.
n
Assigns the number of characters read thus far by the call to scanf() to the corresponding
argument. The corresponding argument shall be a pointer to an unsigned integer.
An optional assignment-suppressing character (*) can be used after the format specifier to
indicate that the conversion specification is to be done, but not saved into a
corresponding variable. In this case, no corresponding argument variable should be
passed to the scanf() function.
A string composed of ordinary non-white space characters is executed by reading the next
character of the string. If one of the inputted characters differs from the string, the
function fails and exits. If a white-space character precedes the ordinary non-white space
characters, then white-space characters are first read in until a non-white space character
is read.
White-space characters are skipped, except for the conversion specifiers [, c or n, unless a
white-space character precedes the [ or c specifiers.
Availability:
All Devices
Requires:
#USE RS232
Examples:
char name[2-];
unsigned int8 number;
signed int32 time;
if(scanf("%u%s%ld",&number,name,&time))
printf"\r\nName: %s, Number: %u, Time: %ld",name,number,time);
Example
Files:
Also See:
None
RS232 I/O Overview, getc(), putc(), printf()
get_capture( )
Syntax:
value = get_capture(x)
Parameters:
x defines which ccp module to read from.
Returns:
A 16-bit timer value.
146
Built-in Functions
Function:
This function obtains the last capture time from the indicated CCP module
Availability:
Only available on devices with Input Capture modules
Requires:
None
Examples:
Example Files:
ex_ccpmp.c
Also See:
setup_ccpx( )
get_capture_event()
Syntax:
Parameters:
Returns:
Function:
Availability:
Requires:
Examples:
result = get_capture_event([stream]);
stream – optional parameter specifying the stream defined in #USE CAPTURE.
TRUE if a capture event occurred, FALSE otherwise.
To determine if a capture event occurred.
All devices.
#USE CAPTURE
#USE CAPTURE(INPUT=PIN_C2,CAPTURE_RISING,TIMER=1,FASTEST)
if(get_capture_event())
result = get_capture_time();
Example Files:
Also See:
None
#use_capture, get_capture_time()
get_capture_time()
Syntax:
result = get_capture_time([stream]);
Parameters:
Returns:
Function:
Availability:
Requires:
Examples:
stream – optional parameter specifying the stream defined in #USE CAPTURE.
An int16 value representing the last capture time.
To get the last capture time.
All devices.
#USE CAPTURE
Example Files:
Also See:
None
#use_capture, get_capture_event()
#USE CAPTURE(INPUT=PIN_C2,CAPTURE_RISING,TIMER=1,FASTEST)
result = get_capture_time();
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CCSC_March 2015-1
get_capture32()
Syntax:
result = get_capture32(x,[wait]);
Parameters:
x is 1-16 and defines which input capture result buffer modules to read from.
wait is an optional parameter specifying if the compiler should read the oldest result in
the bugger or the next result to enter the buffer.
Returns:
Function:
A 32-bit timer value
If wait is true, the current capture values in the result buffer are cleared, and the next result
to be sent to the buffer is returned. If wait is false, the default setting, the first value currently
in the buffer is returned. However, the buffer will only hold four results while waiting for them
to be read, so if get_capture32 is not being called for every capture event. When wait is false,
the buffer will fill with old capture values and any new results will be lost.
Availability:
Only devices with a 32-bit Input Capture module
Requires:
Nothing
Examples:
setup_timer2(TMR_INTERNAL | TMR_DIV_BY_1 | TMR_32_BIT);
setup_capture(1,CAPTURE_FE | CAPTURE_TIMER2 | CAPTURE_32_BIT);
while(TRUE) {
timerValue=get_capture32(1,TRUE);
printf("Capture 1 occurred at: %LU", timerValue);
}
Example Files:
Also See:
None
setup_capture(), setup_compare(), get_capture(), Input Capture Overview
get_nco_accumulator( )
Syntax:
value =get_nco_accumulator( );
Parameters:
none
Returns:
current value of accumulator.
Availability:
On devices with a NCO module.
Examples:
value = get_nco_accumulator( );
Example Files:
None
Also See:
setup_nco( ), set_nco_inc_value( ), get_nco_inc_value( )
148
Built-in Functions
get_nco_inc_value( )
Syntax:
value =get_nco_inc_value( );
Parameters:
None
Returns:
- current value set in increment registers.
Availability:
On devices with a NCO module.
Examples:
value = get_nco_inc_value( );
Example Files:
None
Also See:
setup_nco( ), set_nco_inc_value( ), get_nco_accumulator( )
get_ticks( )
Syntax:
Parameters:
Returns:
Function:
value = get_ticks([stream]);
stream – optional parameter specifying the stream defined in #USE TIMER.
– a 8, 16 or 32 bit integer. (int8, int16 or int32)
Returns the current tick value of the tick timer. The size returned depends on the size of the tick timer.
Availability:
All devices.
Requires:
#USE TIMER(options)
Examples:
#USE TIMER(TIMER=1,TICK=1ms,BITS=16,NOISR)
void main(void) {
unsigned int16 current_tick;
current_tick = get_ticks();
}
Example
Files:
Also See:
None
#USE TIMER, set_ticks()
get_timerA( )
Syntax:
value=get_timerA();
Parameters:
none
Returns:
The current value of the timer as an int8
Function:
Returns the current value of the timer. All timers count up. When a timer reaches the maximum
value it will flip over to 0 and continue counting (254, 255, 0, 1, 2, …).
Availability:
This function is only available on devices with Timer A hardware.
149
CCSC_March 2015-1
Requires:
Nothing
Examples:
set_timerA(0);
while(timerA < 200);
Example Files:
none
Also See:
set_timerA( ), setup_timer_A( ), TimerA Overview
get_timerB( )
Syntax:
value=get_timerB();
Parameters:
none
Returns:
The current value of the timer as an int8
Function:
Returns the current value of the timer. All timers count up. When a timer reaches the maximum
value it will flip over to 0 and continue counting (254, 255, 0, 1, 2, …).
Availability:
This function is only available on devices with Timer B hardware.
Requires:
Nothing
Examples:
set_timerB(0);
while(timerB < 200);
Example Files:
none
Also See:
set_timerB( ), setup_timer_B( ), TimerB Overview
get_timerx( )
Syntax:
value=get_timer0() Same as:
value=get_timer1()
value=get_timer2()
value=get_timer3()
value=get_timer4()
value=get_timer5()
value=get_timer6()
value=get_timer7()
value=get_timer8()
value=get_timer10()
value=get_timer12()
Parameters:
None
Returns:
Timers 1, 3, 5 and 7 return a 16 bit int.
Timers 2 ,4, 6, 8, 10 and 12 return an 8 bit int.
Timer 0 (AKA RTCC) returns a 8 bit int except on the PIC18XXX where it returns a 16 bit int.
Function:
Returns the count value of a real time clock/counter. RTCC and Timer0 are the same. All timers
count up. When a timer reaches the maximum value it will flip over to 0 and continue counting
150
value=get_rtcc()
Built-in Functions
(254, 255, 0, 1, 2...).
Availability:
Timer 0 - All devices
Timers 1 & 2 - Most but not all PCM devices
Timer 3, 5 and 7 - Some PIC18 and Enhanced PIC16 devices
Timer 4,6,8,10 and 12- Some PIC18 and Enhanced PIC16 devices
Requires:
Nothing
Examples:
set_timer0(0);
while ( get_timer0() < 200 ) ;
Example Files:
ex_stwt.c
Also See:
set_timerx() ,
Timer0 Overview , Timer1 Overview , Timer2 Overview , Timer5 Overview
get_tris_x( )
Syntax:
value = get_tris_A();
value = get_tris_B();
value = get_tris_C();
value = get_tris_D();
value = get_tris_E();
value = get_tris_F();
value = get_tris_G();
value = get_tris_H();
value = get_tris_J();
value = get_tris_K()
Parameters:
None
Returns:
int16, the value of TRIS register
Function:
Returns the value of the TRIS register of port A, B, C, D, E, F, G, H, J, or K.
Availability:
All devices.
Requires:
Nothing
Examples:
tris_a = GET_TRIS_A();
Example Files:
None
Also See:
input(), output_low(), output_high()
getenv( )
Syntax:
value = getenv (cstring);
Parameters:
cstring is a constant string with a recognized keyword
Returns:
A constant number, a constant string or 0
151
CCSC_March 2015-1
Function:
152
This function obtains information about the execution environment. The following are recognized
keywords. This function returns a constant 0 if the keyword is not understood.
FUSE_SET:fffff
Returns 1 if fuse fffff is enabled
FUSE_VALID:fffff
Returns 1 if fuse fffff is valid
INT:iiiii
Returns 1 if the interrupt iiiii is valid
ID
Returns the device ID (set by #ID)
DEVICE
Returns the device name string (like "PIC16C74")
CLOCK
Returns the MPU FOSC
VERSION
Returns the compiler version as a float
VERSION_STRING
Returns the compiler version as a string
PROGRAM_MEMORY
Returns the size of memory for code (in words)
STACK
Returns the stack size
SCRATCH
Returns the start of the compiler scratch area
DATA_EEPROM
Returns the number of bytes of data EEPROM
EEPROM_ADDRESS
Returns the address of the start of EEPROM. 0 if not
supported by the device.
READ_PROGRAM
Returns a 1 if the code memory can be read
ADC_CHANNELS
Returns the number of A/D channels
ADC_RESOLUTION
Returns the number of bits returned from READ_ADC()
ICD
Returns a 1 if this is being compiled for a ICD
SPI
Returns a 1 if the device has SPI
USB
Returns a 1 if the device has USB
CAN
Returns a 1 if the device has CAN
I2C_SLAVE
Returns a 1 if the device has I2C slave H/W
I2C_MASTER
Returns a 1 if the device has I2C master H/W
PSP
Returns a 1 if the device has PSP
COMP
Returns a 1 if the device has a comparator
Built-in Functions
VREF
Returns a 1 if the device has a voltage reference
LCD
Returns a 1 if the device has direct LCD H/W
UART
Returns the number of H/W UARTs
AUART
Returns 1 if the device has an ADV UART
CCPx
Returns a 1 if the device has CCP number x
TIMERx
Returns a 1 if the device has TIMER number x
FLASH_WRITE_SIZE
Smallest number of bytes that can be written to FLASH
FLASH_ERASE_SIZE
Smallest number of bytes that can be erased in FLASH
BYTES_PER_ADDRESS
Returns the number of bytes at an address location
BITS_PER_INSTRUCTION
Returns the size of an instruction in bits
RAM
Returns the number of RAM bytes available for your device.
SFR:name
Returns the address of the specified special file register. The
output format can be used with the preprocessor command
#bit. name must match SFR denomination of your target PIC
(example: STATUS, INTCON, TXREG, RCREG, etc)
BIT:name
Returns the bit address of the specified special file register
bit. The output format will be in “address:bit”, which can be
used with the preprocessor command #byte. name must
match SFR.bit denomination of your target PIC (example: C,
Z, GIE, TMR0IF, etc)
SFR_VALID:name
Returns TRUE if the specified special file register name is
valid and exists for your target PIC (example:
getenv("SFR_VALID:INTCON"))
BIT_VALID:name
Returns TRUE if the specified special file register bit is valid
and exists for your target PIC (example:
getenv("BIT_VALID:TMR0IF"))
PIN:PB
Returns 1 if PB is a valid I/O PIN (like A2)
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CCSC_March 2015-1
UARTx_RX
Returns UARTxPin (like PINxC7)
UARTx_TX
Returns UARTxPin (like PINxC6)
SPIx_DI
SPIxDO
Returns SPIxDI Pin
Returns SPIxDO Pin
SPIxCLK
ETHERNET
Returns SPIxCLK Pin
Returns 1 if device supports Ethernet
QEI
DAC
Returns 1 if device has QEI
Returns 1 if device has a D/A Converter
DSP
Returns 1 if device supports DSP instructions
DCI
Returns 1 if device has a DCI module
DMA
Returns 1 if device supports DMA
CRC
Returns 1 if device has a CRC module
CWG
Returns 1 if device has a CWG module
NCO
Returns 1 if device has a NCO module
CLC
Returns 1 if device has a CLC module
DSM
Returns 1 if device has a DSM module
OPAMP
Returns 1 if device has op amps
RTC
Returns 1 if device has a Real Time Clock
CAP_SENSE
Returns 1 if device has a CSM cap sense module and 2 if it
has a CTMU module
EXTERNAL_MEMORY
Returns 1 if device supports external program memory
INSTRUCTION_CLOCK
Returns the MPU instruction clock
ENH16
Returns 1 for Enhanced 16 devices
Availability:
All devices
Requires:
Nothing
Examples:
#IF getenv("VERSION")<3.050
#ERROR Compiler version too old
#ENDIF
for(i=0;i<getenv("DATA_EEPROM");i++)
write_eeprom(i,0);
154
Built-in Functions
#IF getenv("FUSE_VALID:BROWNOUT")
#FUSE BROWNOUT
#ENDIF
#byte status_reg=GETENV(“SFR:STATUS”)
#bit carry_flag=GETENV(“BIT:C”)
Example Files:
None
Also See:
None
goto_address( )
Syntax:
goto_address(location);
Parameters:
location is a ROM address, 16 or 32 bit int.
Returns:
Nothing
Function:
This function jumps to the address specified by location. Jumps outside of the current function
should be done only with great caution. This is not a normally used function except in very special
situations.
Availability:
All devices
Requires:
Nothing
Examples:
#define LOAD_REQUEST PIN_B1
#define LOADER 0x1f00
if(input(LOAD_REQUEST))
goto_address(LOADER);
Example Files:
setjmp.h
Also See:
label_address( )
high_speed_adc_done( )
Syntax:
value = high_speed_adc_done([pair]);
Parameters:
pair – Optional parameter that determines which ADC pair's ready flag to check. If not used all ready flags
are checked.
Returns:
An int16. If pair is used 1 will be return if ADC is done with conversion, 0 will be return if still busy. If pair
isn't use it will return a bit map of which conversion are ready to be read. For example a return value of
0x0041 means that ADC pair 6, AN12 and AN13, and ADC pair 0, AN0 and AN1, are ready to be read.
Function:
Can be polled to determine if the ADC has valid data to be read.
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CCSC_March 2015-1
Availability:
Only on dsPIC33FJxxGSxxx devices.
Requires:
None
Examples:
int16 result[2]
setup_high_speed_adc_pair(1, INDIVIDUAL_SOFTWARE_TRIGGER);
setup_high_speed_adc( ADC_CLOCK_DIV_4);
read_high_speed_adc(1, ADC_START_ONLY);
while(!high_speed_adc_done(1));
read_high_speed_adc(1, ADC_READ_ONLY, result);
printf(“AN2 value = %LX, AN3 value = %LX\n\r”,result[0],result[1]);
Example
Files:
Also See:
None
setup_high_speed_adc(), setup_high_speed_adc_pair(), read_high_speed_adc()
i2c_init( )
Syntax:
Parameters:
Returns:
Function:
Availability:
Requires:
Examples:
Example Files:
Also See:
i2c_init([stream],baud);
stream – optional parameter specifying the stream defined in #USE I2C.
baud – if baud is 0, I2C peripheral will be disable. If baud is 1, I2C peripheral is initialized and
enabled with baud rate specified in #USE I2C directive. If baud is > 1 then I2C peripheral is
initialized and enabled to specified baud rate.
Nothing
To initialize I2C peripheral at run time to specified baud rate.
All devices.
#USE I2C
#USE I2C(MASTER,I2C1, FAST,NOINIT)
i2c_init(TRUE); //initialize and enable I2C peripheral to baud rate specified in //#USE
I2C
i2c_init(500000); //initialize and enable I2C peripheral to a baud rate of 500 //KBPS
None
I2C_POLL( ), i2c_speed( ), I2C_SlaveAddr( ), I2C_ISR_STATE(_) ,I2C_WRITE( ),
I2C_READ( ), _USE_I2C( ), I2C( )
i2c_isr_state( )
Syntax:
Parameters:
Returns:
156
state = i2c_isr_state();
state = i2c_isr_state(stream);
None
state is an 8 bit int
0 - Address match received with R/W bit clear, perform i2c_read( ) to read the I2C address.
1-0x7F - Master has written data; i2c_read() will immediately return the data
0x80 - Address match received with R/W bit set; perform i2c_read( ) to read the I2C address, and
use i2c_write( ) to pre-load the transmit buffer for the next transaction (next I2C read performed by
master will read this byte).
Built-in Functions
0x81-0xFF - Transmission completed and acknowledged; respond with i2c_write() to pre-load the
transmit buffer for the next transation (the next I2C read performed by master will read this byte).
Function:
Returns the state of I2C communications in I2C slave mode after an SSP interrupt. The return value
increments with each byte received or sent.
If 0x00 or 0x80 is returned, an i2C_read( ) needs to be performed to read the I2C address that was
sent (it will match the address configured by #USE I2C so this value can be ignored)
Availability:
Requires:
Devices with i2c hardware
#USE I2C
Examples:
#INT_SSP
void i2c_isr() {
state = i2c_isr_state();
if(state== 0 ) i2c_read();
[email protected]_read();
if(state == 0x80)
i2c_read(2);
if(state >= 0x80)
i2c_write(send_buffer[state - 0x80]);
else if(state > 0)
rcv_buffer[state - 1] = i2c_read();
}
Example Files:
ex_slave.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i 2c_write, i2c_read, #USE I2C, I2C Overview
i2c_poll( )
Syntax:
i2c_poll()
i2c_poll(stream)
Parameters:
stream (optional)- specify the stream defined in #USE I2C
Returns:
1 (TRUE) or 0 (FALSE)
Function:
The I2C_POLL() function should only be used when the built-in SSP is used. This function
returns TRUE if the hardware has a received byte in the buffer. When a TRUE is returned, a call
to I2C_READ() will immediately return the byte that was received.
Availability:
Devices with built in I2C
Requires:
#USE I2C
Examples:
if(i2c-poll())
buffer [index]=i2c-read();//read data
Example Files:
None
Also See:
i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i2c_write, i2c_read, #USE I2C, I2C
Overview
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CCSC_March 2015-1
i2c_read( )
Syntax:
data = i2c_read();
data = i2c_read(ack);
data = i2c_read(stream, ack);
Parameters:
ack -Optional, defaults to 1.
0 indicates do not ack.
1 indicates to ack.
2 slave only, indicates to not release clock at end of read. Use when i2c_isr_state ()
returns 0x80.
stream - specify the stream defined in #USE I2C
Returns:
data - 8 bit int
Function:
Reads a byte over the I2C interface. In master mode this function will generate the clock and in
slave mode it will wait for the clock. There is no timeout for the slave, use i2c_poll() to prevent a
lockup. Use restart_wdt() in the #USE I2C to strobe the watch-dog timer in the slave mode while
waiting.
Availability:
All devices.
Requires:
#USE I2C
Examples:
i2c_start();
i2c_write(0xa1);
data1 = i2c_read(TRUE);
data2 = i2c_read(FALSE);
i2c_stop();
Example Files:
ex_extee.c with 2416.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i 2c_write, #USE I2C, I2C
Overview
i2c_slaveaddr( )
Syntax:
I2C_SlaveAddr(addr);
I2C_SlaveAddr(stream, addr);
Parameters:
addr = 8 bit device address
stream(optional) - specifies the stream used in #USE I2C
Returns:
Nothing
Function:
This functions sets the address for the I2C interface in slave mode.
Availability:
Devices with built in I2C
Requires:
#USE I2C
Examples:
i2c_SlaveAddr(0x08);
i2c_SlaveAddr(i2cStream1, 0x08);
Example Files:
ex_slave.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_isr_state, i2c_write, i2c_read, #USE I2C, I2C Overview
158
Built-in Functions
i2c_speed( )
Syntax:
i2c_speed (baud)
i2c_speed (stream, baud)
Parameters:
baud is the number of bits per second.
stream - specify the stream defined in #USE I2C
Returns:
Nothing.
Function:
This function changes the I2c bit rate at run time. This only works if the hardware I2C module is
being used.
Availability:
All devices.
Requires:
#USE I2C
Examples:
I2C_Speed (400000);
Example Files:
none
Also See:
i2c_poll, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i 2c_write, i2c_read, #USE I2C, I2C
Overview
i2c_start( )
Syntax:
i2c_start()
i2c_start(stream)
i2c_start(stream, restart)
Parameters:
stream: specify the stream defined in #USE I2C
restart: 2 – new restart is forced instead of start
1 – normal start is performed
0 (or not specified) – restart is done only if the compiler last encountered a I 2C_START and no
I2C_STOP
Returns:
undefined
Function:
Issues a start condition when in the I2C master mode. After the start condition the clock is held
low until I2C_WRITE() is called. If another I2C_start is called in the same function before an
i2c_stop is called, then a special restart condition is issued. Note that specific I2C protocol
depends on the slave device. The I2C_START function will now accept an optional parameter. If
1 the compiler assumes the bus is in the stopped state. If 2 the compiler treats this I2C_START
as a restart. If no parameter is passed a 2 is used only if the compiler compiled a I2C_START
last with no I2C_STOP since.
Availability:
All devices.
Requires:
#USE I2C
Examples:
i2c_start();
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CCSC_March 2015-1
i2c_write(0xa0);
i2c_write(address);
i2c_start();
i2c_write(0xa1);
data=i2c_read(0);
i2c_stop();
//
//
//
//
//
Device address
Data to device
Restart
to change data direction
Now read from slave
Example Files:
ex_extee.c with 2416.c
Also See:
i2c_poll, i2c_speed, i2c_stop, i2c_slaveaddr, i2c_isr_state, i2c_write, i2c_read, #USE I2C, I2C
Overview
i2c_stop( )
Syntax:
i2c_stop()
i2c_stop(stream)
Parameters:
stream: (optional) specify stream defined in #USE I2C
Returns:
undefined
Function:
Issues a stop condition when in the I2C master mode.
Availability:
All devices.
Requires:
#USE I2C
Examples:
i2c_start();
i2c_write(0xa0);
i2c_write(5);
i2c_write(12);
i2c_stop();
Example Files:
ex_extee.c with 2416.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_slaveaddr, i2c_isr_state, i 2c_write, i2c_read, #USE I2C, I2C
Overview
//
//
//
//
//
Start condition
Device address
Device command
Device data
Stop condition
i2c_write( )
Syntax:
i2c_write (data)
i2c_write (stream, data)
Parameters:
data is an 8 bit int
stream - specify the stream defined in #USE I2C
Returns:
This function returns the ACK Bit.
0 means ACK, 1 means NO ACK, 2 means there was a collision if in Multi_Master Mode.
This does not return an ACK if using i2c in slave mode.
Function:
Sends a single byte over the I2C interface. In master mode this function will generate a clock
with the data and in slave mode it will wait for the clock from the master. No automatic timeout is
provided in this function. This function returns the ACK bit. The LSB of the first write after a
start determines the direction of data transfer (0 is master to slave). Note that specific I 2C
160
Built-in Functions
protocol depends on the slave device.
Availability:
All devices.
Requires:
#USE I2C
Examples:
long cmd;
...
i2c_start();
// Start condition
i2c_write(0xa0);// Device address
i2c_write(cmd);// Low byte of command
i2c_write(cmd>>8);// High byte of command
i2c_stop();
// Stop condition
Example Files:
ex_extee.c with 2416.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i 2c_read, #USE I2C, I2C
Overview
input( )
Syntax:
value = input (pin)
Parameters:
Pin to read. Pins are defined in the devices .h file. The actual value is a bit address. For
example, port a (byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as
follows: #define PIN_A3 43 .
Returns:
The PIN could also be a variable. The variable must have a value equal to one of the constants
(like PIN_A1) to work properly. The tristate register is updated unless the FAST_IO mode is set
on port A. note that doing I/O with a variable instead of a constant will take much longer time.
0 (or FALSE) if the pin is low,
1 (or TRUE) if the pin is high
Function:
This function returns the state of the indicated pin. The method of I/O is dependent on the last
USE *_IO directive. By default with standard I/O before the input is done the data direction is set
to input.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file
Examples:
while ( !input(PIN_B1) );
// waits for B1 to go high
if( input(PIN_A0) )
printf("A0 is now high\r\n");
int16 i=PIN_B1;
while(!i);
//waits for B1 to go high
Example Files:
ex_pulse.c
Also See:
input_x(), output_low(), output_high(), #USE FIXED_IO, #USE FAST_IO, #USE
STANDARD_IO, General Purpose I/O
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CCSC_March 2015-1
input_change_x( )
Syntax:
value = input_change_a( );
value = input_change_b( );
value = input_change_c( );
value = input_change_d( );
value = input_change_e( );
value = input_change_f( );
value = input_change_g( );
value = input_change_h( );
value = input_change_j( );
value = input_change_k( );
Parameters:
None
Returns:
An 8-bit or 16-bit int representing the changes on the port.
Function:
This function reads the level of the pins on the port and compares them to the results the last time the
input_change_x( ) function was called. A 1 is returned if the value has changed, 0 if the value is
unchanged.
Availability:
All devices.
Requires:
None
Examples:
pin_check = input_change_b( );
Example
Files:
Also See:
None
input( ), input_x( ), output_x( ), #USE FIXED_IO, #USE FAST_IO, #USE STANDARD_IO, General
Purpose I/O
input_state( )
Syntax:
value = input_state(pin)
Parameters:
pin to read. Pins are defined in the devices .h file. The actual value is a bit address. For example,
port a (byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #define
PIN_A3 43 .
Returns:
Bit specifying whether pin is high or low. A 1 indicates the pin is high and a 0 indicates it is low.
Function:
This function reads the level of a pin without changing the direction of the pin as INPUT() does.
Availability:
All devices.
Requires:
Nothing
Examples:
level = input_state(pin_A3);
printf("level: %d",level);
Example Files:
None
162
Built-in Functions
Also See:
input(), set_tris_x(), output_low(), output_high(), General Purpose I/O
input_x( )
Syntax:
value = input_a()
value = input_b()
value = input_c()
value = input_d()
value = input_e()
value = input_f()
value = input_g()
value = input_h()
value = input_j()
value = input_k()
Parameters:
None
Returns:
An 8 bit int representing the port input data.
Function:
Inputs an entire byte from a port. The direction register is changed in accordance with the last specified
#USE *_IO directive. By default with standard I/O before the input is done the data direction is set to input.
Availability:
All devices.
Requires:
Nothing
Examples:
data = input_b();
Example
Files:
Also See:
ex_psp.c
input(), output_x(), #USE FIXED_IO, #USE FAST_IO, #USE STANDARD_IO
interrupt_active( )
Syntax:
interrupt_active (interrupt)
Parameters:
Interrupt – constant specifying the interrupt
Returns:
Boolean value
Function:
The function checks the interrupt flag of the specified interrupt and returns true in case the flag is
set.
Availability:
Device with interrupts
Requires:
Should have a #INT_xxxx, Constants are defined in the devices .h file.
Examples:
interrupt_active(INT_TIMER0);
interrupt_active(INT_TIMER1);
Example Files:
None
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CCSC_March 2015-1
Also See:
disable_interrupts() , #INT , Interrupts Overview
clear_interrupt, enable_interrupts()
isalnum(char) isalpha(char)
iscntrl(x) isdigit(char)
isgraph(x) islower(char) isspace(char) isupper(char)
isxdigit(char) isprint(x) ispunct(x)
Syntax:
value = isalnum(datac)
value = isalpha(datac)
value = isdigit(datac)
value = islower(datac)
value = isspace(datac)
value = isupper(datac)
value = isxdigit(datac)
value = iscntrl(datac)
value = isgraph(datac)
value = isprint(datac)
value = punct(datac)
Parameters:
datac is a 8 bit character
Returns:
0 (or FALSE) if datac dose not match the criteria, 1 (or TRUE) if datac does match the criteria.
Function:
Tests a character to see if it meets specific criteria as follows:
isalnum(x)
X is 0..9, 'A'..'Z', or 'a'..'z'
isalpha(x)
X is 'A'..'Z' or 'a'..'z
isdigit(x)
X is '0'..'9'
islower(x)
X is 'a'..'z'
isupper(x)
X is 'A'..'Z
isspace(x)
X is a space
isxdigit(x)
X is '0'..'9', 'A'..'F', or 'a'..'f
iscntrl(x)
X is less than a space
isgraph(x)
X is greater than a space
isprint(x)
X is greater than or equal to a space
ispunct(x)
X is greater than a space and not a letter or number
Availability:
All devices.
Requires:
#INCLUDE <ctype.h>
Examples:
char id[20];
...
if(isalpha(id[0])) {
valid_id=TRUE;
for(i=1;i<strlen(id);i++)
valid_id=valid_id && isalnum(id[i]);
} else
valid_id=FALSE;
Example Files:
ex_str.c
Also See:
isamong()
164
Built-in Functions
isamong( )
Syntax:
result = isamong (value, cstring)
Parameters:
value is a character
cstring is a constant sting
Returns:
0 (or FALSE) if value is not in cstring
1 (or TRUE) if value is in cstring
Function:
Returns TRUE if a character is one of the characters in a constant string.
Availability:
All devices
Requires:
Nothing
Examples:
char x= 'x';
...
if ( isamong ( x,
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ") )
printf ("The character is valid");
Example Files:
#INCLUDE <ctype.h>
Also See:
isalnum( ), isalpha( ), isdigit( ), isspace( ), islower( ), isupper( ), isxdigit( )
itoa( )
Syntax:
string = itoa(i32value, i8base, string)
Parameters:
i32value is a 32 bit int
i8base is a 8 bit int
string is a pointer to a null terminated string of characters
Returns:
string is a pointer to a null terminated string of characters
Function:
Converts the signed int32 to a string according to the provided base and returns the converted
value if any. If the result cannot be represented, the function will return 0.
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
int32 x=1234;
char string[5];
itoa(x,10, string);
// string is now “1234”
Example Files:
None
Also See:
None
165
CCSC_March 2015-1
jump_to_isr( )
Syntax:
jump_to_isr (address)
Parameters:
address is a valid program memory address
Returns:
No value
Function:
The jump_to_isr function is used when the location of the interrupt service routines are not at the
default location in program memory. When an interrupt occurs, program execution will jump to the
default location and then jump to the specified address.
Availability:
All devices
Requires:
Nothing
Examples:
int_global
void global_isr(void) {
jump_to_isr(isr_address);
}
Example Files:
Also See:
ex_bootloader.c
#BUILD
kbhit( )
Syntax:
value = kbhit()
value = kbhit (stream)
Parameters:
stream is the stream id assigned to an available RS232 port. If the stream parameter is not
included, the function uses the primary stream used by getc().
Returns:
0 (or FALSE) if getc() will need to wait for a character to come in, 1 (or TRUE) if a character is
ready for getc()
Function:
If the RS232 is under software control this function returns TRUE if the start bit of a character is
being sent on the RS232 RCV pin. If the RS232 is hardware this function returns TRUE if a
character has been received and is waiting in the hardware buffer for getc() to read. This function
may be used to poll for data without stopping and waiting for the data to appear. Note that in the
case of software RS232 this function should be called at least 10 times the bit rate to ensure
incoming data is not lost.
Availability:
All devices.
Requires:
#USE RS232
Examples:
char timed_getc() {
long timeout;
timeout_error=FALSE;
timeout=0;
while(!kbhit()&&(++timeout<50000)) // 1/2
// second
166
Built-in Functions
delay_us(10);
if(kbhit())
return(getc());
else {
timeout_error=TRUE;
return(0);
}
}
Example Files:
ex_tgetc.c
Also See:
getc(), #USE RS232, RS232 I/O Overview
label_address( )
Syntax:
value = label_address(label);
Parameters:
label is a C label anywhere in the function
Returns:
A 16 bit int in PCB,PCM and a 32 bit int for PCH, PCD
Function:
This function obtains the address in ROM of the next instruction after the label. This is not a
normally used function except in very special situations.
Availability:
All devices.
Requires:
Nothing
Examples:
start:
a = (b+c)<<2;
end:
printf("It takes %lu ROM locations.\r\n",
label_address(end)-label_address(start));
Example Files:
setjmp.h
Also See:
goto_address()
labs( )
Syntax:
result = labs (value)
Parameters:
value is a 16 bit signed long int
Returns:
A 16 bit signed long int
Function:
Computes the absolute value of a long integer.
Availability:
All devices.
Requires:
#INCLUDE <stdlib.h>
Examples:
if(labs( target_value - actual_value ) > 500)
printf("Error is over 500 points\r\n");
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CCSC_March 2015-1
Example Files:
None
Also See:
abs()
lcd_contrast( )
Syntax:
lcd_contrast ( contrast )
Parameters:
contrast is used to set the internal contrast control resistance ladder.
Returns:
undefined.
Function:
This function controls the contrast of the LCD segments with a value passed in between 0 and 7.
A value of 0 will produce the minimum contrast, 7 will produce the maximum contrast.
Availability:
Only on select devices with built-in LCD Driver Module hardware.
Requires:
None.
Examples:
lcd_contrast( 0 );
lcd_contrast( 7 );
Example Files:
None.
Also See:
lcd_load( ), lcd_symbol( ), setup_lcd( ), Internal LCD Overview
// Minimum Contrast
// Maximum Contrast
lcd_load( )
Syntax:
lcd_load (buffer_pointer, offset, length);
Parameters:
buffer_pointer points to the user data to send to the LCD, offset is the offset into the LCD
segment memory to write the data, length is the number of bytes to transfer to the LCD segment
memory.
Returns:
undefined.
Function:
This function will load length bytes from buffer_pointer into the LCD segment memory
beginning at offset. The lcd_symbol( ) function provides as easier way to write data to the
segment memory.
Availability:
Only on devices with built-in LCD Driver Module hardware.
Requires
Constants are defined in the devices *.h file.
Examples:
lcd_load(buffer, 0, 16);
Example Files:
ex_92lcd.c
Also See:
lcd_symbol(), setup_lcd(), lcd_contrast( ), Internal LCD Overview
168
Built-in Functions
lcd_symbol( )
Syntax:
lcd_symbol (symbol, bX_addr);
Parameters:
symbol is a 8 bit or 16 bit constant.
bX_addr is a bit address representing the segment location to be used for bit X of the specified
symbol.
1-16 segments could be specified.
Returns:
undefined
Function:
This function loads the bits for the symbol into the segment data registers for the LCD with each
bit address specified. If bit X in symbol is set, the segment at bX_addr is set, otherwise it is
cleared. The bX_addr is a bit address into the LCD RAM.
Availability:
Only on devices with built-in LCD Driver Module hardware.
Requires
Constants are defined in the devices *.h file.
Examples:
byte CONST DIGIT_MAP[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE,
0xE6};
#define DIGIT1
COM3+18
COM1+20, COM1+18, COM2+18, COM3+20, COM2+28, COM1+28, COM2+20,
for(i = 0; i <= 9; i++) {
lcd_symbol( DIGIT_MAP[i], DIGIT1 );
delay_ms( 1000 );
}
Example Files:
ex_92lcd.c
Also See:
setup_lcd(), lcd_load(), lcd_contrast( ), Internal LCD Overview
ldexp( )
Syntax:
result= ldexp (value, exp);
Parameters:
value is float
exp is a signed int.
Returns:
result is a float with value result times 2 raised to power exp.
Function:
The ldexp function multiplies a floating-point number by an integral power of 2.
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
float result;
result=ldexp(.5,0);
// result is .5
Example Files:
None
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CCSC_March 2015-1
Also See:
frexp(), exp(), log(), log10(), modf()
log( )
Syntax:
result = log (value)
Parameters:
value is a float
Returns:
A float
Function:
Computes the natural logarithm of the float x. If the argument is less than or equal to zero or too
large, the behavior is undefined.
Note on error handling:
"errno.h" is included then the domain and range errors are stored in the errno variable. The user
can check the errno to see if an error has occurred and print the error using the perror function.
Domain error occurs in the following cases:
 log: when the argument is negative
Availability:
All devices
Requires:
#INCLUDE <math.h>
Examples:
lnx = log(x);
Example Files:
None
Also See:
log10(), exp(), pow()
log10( )
Syntax:
result = log10 (value)
Parameters:
value is a float
Returns:
A float
Function:
Computes the base-ten logarithm of the float x. If the argument is less than or equal to zero or too
large, the behavior is undefined.
Note on error handling:
If "errno.h" is included then the domain and range errors are stored in the errno variable. The
user can check the errno to see if an error has occurred and print the error using the perror
function.
Domain error occurs in the following cases:
 log10: when the argument is negative
Availability:
170
All devices
Built-in Functions
Requires:
#INCLUDE <math.h>
Examples:
db = log10( read_adc()*(5.0/255) )*10;
Example Files:
None
Also See:
log(), exp(), pow()
longjmp( )
Syntax:
longjmp (env, val)
Parameters:
env: The data object that will be restored by this function
val: The value that the function setjmp will return. If val is 0 then the function setjmp will return 1
instead.
Returns:
After longjmp is completed, program execution continues as if the corresponding invocation of the
setjmp function had just returned the value specified by val.
Function:
Performs the non-local transfer of control.
Availability:
All devices
Requires:
#INCLUDE <setjmp.h>
Examples:
longjmp(jmpbuf, 1);
Example Files:
None
Also See:
setjmp()
make8( )
Syntax:
i8 = MAKE8(var, offset)
Parameters:
var is a 16 or 32 bit integer.
offset is a byte offset of 0,1,2 or 3.
Returns:
An 8 bit integer
Function:
Extracts the byte at offset from var. Same as: i8 = (((var >> (offset*8)) & 0xff) except it is done
with a single byte move.
Availability:
All devices
Requires:
Nothing
Examples:
int32 x;
int y;
y = make8(x,3);
Example Files:
// Gets MSB of x
None
171
CCSC_March 2015-1
Also See:
make16(), make32()
make16( )
Syntax:
i16 = MAKE16(varhigh, varlow)
Parameters:
varhigh and varlow are 8 bit integers.
Returns:
A 16 bit integer
Function:
Makes a 16 bit number out of two 8 bit numbers. If either parameter is 16 or 32 bits only the lsb
is used. Same as: i16 = (int16)(varhigh&0xff)*0x100+(varlow&0xff) except it is done with two
byte moves.
Availability:
All devices
Requires:
Nothing
Examples:
long x;
int hi,lo;
x = make16(hi,lo);
Example Files:
ltc1298.c
Also See:
make8(), make32()
make32( )
Syntax:
i32 = MAKE32(var1, var2, var3, var4)
Parameters:
var1-4 are a 8 or 16 bit integers. var2-4 are optional.
Returns:
A 32 bit integer
Function:
Makes a 32 bit number out of any combination of 8 and 16 bit numbers. Note that the number of
parameters may be 1 to 4. The msb is first. If the total bits provided is less than 32 then zeros
are added at the msb.
Availability:
All devices
Requires:
Nothing
Examples:
int32 x;
int y;
long z;
x = make32(1,2,3,4);
// x is 0x01020304
y=0x12;
z=0x4321;
x = make32(y,z);
172
// x is 0x00124321
Built-in Functions
x = make32(y,y,z);
Example Files:
ex_freqc.c
Also See:
make8(), make16()
// x is 0x12124321
malloc( )
Syntax:
ptr=malloc(size)
Parameters:
size is an integer representing the number of byes to be allocated.
Returns:
A pointer to the allocated memory, if any. Returns null otherwise.
Function:
The malloc function allocates space for an object whose size is specified by size and whose
value is indeterminate.
Availability:
All devices
Requires:
#INCLUDE <stdlibm.h>
Examples:
int * iptr;
iptr=malloc(10);
// iptr will point to a block of memory of 10 bytes.
Example Files:
None
Also See:
realloc(), free(), calloc()
memcpy( ) memmove( )
Syntax:
memcpy (destination, source, n)
memmove(destination, source, n)
Parameters:
destination is a pointer to the destination memory.
source is a pointer to the source memory,.
n is the number of bytes to transfer
Returns:
undefined
Function:
Copies n bytes from source to destination in RAM. Be aware that array names are pointers where
other variable names and structure names are not (and therefore need a & before them).
Memmove performs a safe copy (overlapping objects doesn't cause a problem). Copying takes
place as if the n characters from the source are first copied into a temporary array of n characters
that doesn't overlap the destination and source objects. Then the n characters from the temporary
array are copied to destination.
Availability:
All devices
Requires:
Nothing
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CCSC_March 2015-1
Examples:
memcpy(&structA, &structB, sizeof (structA));
memcpy(arrayA,arrayB,sizeof (arrayA));
memcpy(&structA, &databyte, 1);
char a[20]="hello";
memmove(a,a+2,5);
// a is now "llo"
Example Files:
None
Also See:
strcpy(), memset()
memset( )
Syntax:
memset (destination, value, n)
Parameters:
destination is a pointer to memory.
value is a 8 bit int
n is a 16 bit int.
On PCB and PCM parts n can only be 1-255.
Returns:
undefined
Function:
Sets n number of bytes, starting at destination, to value. Be aware that array names are pointers
where other variable names and structure names are not (and therefore need a & before them).
Availability:
All devices
Requires:
Nothing
Examples:
memset(arrayA, 0, sizeof(arrayA));
memset(arrayB, '?', sizeof(arrayB));
memset(&structA, 0xFF, sizeof(structA));
Example Files:
None
Also See:
memcpy()
modf( )
Syntax:
result= modf (value, & integral)
Parameters:
value is a float
integral is a float
Returns:
result is a float
Function:
The modf function breaks the argument value into integral and fractional parts, each of which
has the same sign as the argument. It stores the integral part as a float in the object integral.
Availability:
All devices
174
Built-in Functions
Requires:
#INCLUDE <math.h>
Examples:
float result, integral;
result=modf(123.987,&integral);
// result is .987 and integral is 123.0000
Example Files:
None
Also See:
None
_mul( )
Syntax:
prod=_mul(val1, val2);
Parameters:
val1 and val2 are both 8-bit or 16-bit integers
Returns:
A 16-bit integer if both parameters are 8-bit integers, or a 32-bit integer if both parameters are
16-bit integers.
Function:
Performs an optimized multiplication. By accepting a different type than it returns, this function
avoids the overhead of converting the parameters to a larger type.
Availability:
All devices
Requires:
Nothing
Examples:
int a=50, b=100;
long int c;
c = _mul(a, b);
Example
Files:
Also See:
//c holds 5000
None
None
nargs( )
Syntax:
void foo(char * str, int count, ...)
Parameters:
The function can take variable parameters. The user can use stdarg library to create functions that
take variable parameters.
Returns:
Function dependent.
Function:
The stdarg library allows the user to create functions that supports variable arguments.
The function that will accept a variable number of arguments must have at least one actual, known
parameters, and it may have more. The number of arguments is often passed to the function in
one of its actual parameters. If the variable-length argument list can involve more that one type,
the type information is generally passed as well. Before processing can begin, the function creates
a special argument pointer of type va_list.
Availability:
All devices
Requires:
#INCLUDE <stdarg.h>
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CCSC_March 2015-1
Examples:
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr; // create special argument pointer
va_start(argptr,num); // initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr); // end variable processing
return sum;
}
void main()
{
int total;
total = foo(2,4,6,9,10,2);
}
Example Files:
None
Also See:
va_start( ) , va_end( ) , va_arg( )
offsetof( ) offsetofbit( )
Syntax:
value = offsetof(stype, field);
value = offsetofbit(stype, field);
Parameters:
stype is a structure type name.
Field is a field from the above structure
Returns:
An 8 bit byte
Function:
These functions return an offset into a structure for the indicated field.
offsetof returns the offset in bytes and offsetofbit returns the offset in bits.
Availability:
All devices
Requires:
#INCLUDE <stddef.h>
Examples:
struct
time_structure {
int hour, min, sec;
int zone : 4;
intl daylight_savings;
}
x = offsetof(time_structure, sec);
// x will be 2
x = offsetofbit(time_structure, sec);
// x will be 16
x = offsetof (time_structure,
daylight_savings);
// x will be 3
x = offsetofbit(time_structure,
daylight_savings);
// x will be 28
Example Files:
176
None
Built-in Functions
Also See:
None
output_x( )
Syntax:
output_a (value)
output_b (value)
output_c (value)
output_d (value)
output_e (value)
output_f (value)
output_g (value)
output_h (value)
output_j (value)
output_k (value)
Parameters:
value is a 8 bit int
Returns:
undefined
Function:
Output an entire byte to a port. The direction register is changed in accordance with the last
specified #USE *_IO directive.
Availability:
All devices, however not all devices have all ports (A-E)
Requires:
Nothing
Examples:
OUTPUT_B(0xf0);
Example Files:
ex_patg.c
Also See:
input(), output_low(), output_high(), output_float(), output_bit(), #USE FIXED_IO, #USE
FAST_IO, #USE STANDARD_IO, General Purpose I/O
output_bit( )
Syntax:
output_bit (pin, value)
Parameters:
Pins are defined in the devices .h file. The actual number is a bit address. For example, port a
(byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #define PIN_A3 43
. The PIN could also be a variable. The variable must have a value equal to one of the constants
(like PIN_A1) to work properly. The tristate register is updated unless the FAST_IO mode is set
on port A. Note that doing I/O with a variable instead of a constant will take much longer time.
Value is a 1 or a 0.
Returns:
undefined
Function:
Outputs the specified value (0 or 1) to the specified I/O pin. The
method of setting the direction register is determined by the last
#USE *_IO directive.
Availability:
All devices.
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CCSC_March 2015-1
Requires:
Pin constants are defined in the devices .h file
Examples:
output_bit( PIN_B0, 0);
// Same as output_low(pin_B0);
output_bit( PIN_B0,input( PIN_B1 ) );
// Make pin B0 the same as B1
output_bit( PIN_B0,shift_left(&data,1,input(PIN_B1)));
// Output the MSB of data to
// B0 and at the same time
// shift B1 into the LSB of data
int16 i=PIN_B0;
ouput_bit(i,shift_left(&data,1,input(PIN_B1)));
//same as above example, but
//uses a variable instead of a constant
Example Files:
ex_extee.c with 9356.c
Also See:
input(), output_low(), output_high(), output_float(), output_x(), #USE FIXED_IO, #USE
FAST_IO, #USE STANDARD_IO, General Purpose I/O
output_drive( )
Syntax:
output_drive(pin)
Parameters:
Pins are defined in the devices .h file. The actual value is a bit address. For example, port a (byte 5
) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #DEFINE PIN_A3 43 .
Returns:
undefined
Function:
Sets the specified pin to the output mode.
Availability:
All devices.
Requires:
Pin constants are defined in the devices.h file.
Examples:
output_drive(pin_A0); // sets pin_A0 to output its value
output_bit(pin_B0, input(pin_A0)) // makes B0 the same as A0
Example Files:
None
Also See:
input(), output_low(), output_high(), output_bit(), output_x(), output_float()
.
output_float( )
Syntax:
output_float (pin)
Parameters:
Pins are defined in the devices .h file. The actual value is a bit address. For example, port a
(byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #DEFINE PIN_A3
43 . The PIN could also be a variable to identify the pin. The variable must have a value equal to
one of the constants (like PIN_A1) to work properly. Note that doing I/O with a variable instead
178
Built-in Functions
of a constant will take much longer time.
Returns:
undefined
Function:
Sets the specified pin to the input mode. This will allow the pin to float high to represent a high
on an open collector type of connection.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file
Examples:
if( (data & 0x80)==0 )
output_low(pin_A0);
else
output_float(pin_A0);
Example Files:
None
Also See:
input(), output_low(), output_high(), output_bit(), output_x(), output_drive(), #USE FIXED_IO,
#USE FAST_IO, #USE STANDARD_IO, General Purpose I/O
output_high( )
Syntax:
output_high (pin)
Parameters:
Pin to write to. Pins are defined in the devices .h file. The actual value is a bit address. For
example, port a (byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as
follows: #DEFINE PIN_A3 43 . The PIN could also be a variable. The variable must have a value
equal to one of the constants (like PIN_A1) to work properly. The tristate register is updated
unless the FAST_IO mode is set on port A. Note that doing I/O with a variable instead of a
constant will take much longer time.
Returns:
undefined
Function:
Sets a given pin to the high state. The method of I/O used is dependent on the last USE *_IO
directive.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file
Examples:
output_high(PIN_A0);
Int16 i=PIN_A1;
output_low(PIN_A1);
Example Files:
ex_sqw.c
Also See:
input(), output_low(), output_float(), output_bit(), output_x(), #USE FIXED_IO, #USE FAST_IO,
#USE STANDARD_IO, General Purpose I/O
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output_low( )
Syntax:
output_low (pin)
Parameters:
Pins are defined in the devices .h file. The actual value is a bit address. For example, port a
(byte 5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #DEFINE PIN_A3
43 . The PIN could also be a variable. The variable must have a value equal to one of the
constants (like PIN_A1) to work properly. The tristate register is updated unless the FAST_IO
mode is set on port A. Note that doing I/O with a variable instead of a constant will take much
longer time.
Returns:
undefined
Function:
Sets a given pin to the ground state. The method of I/O used is dependent on the last USE *_IO
directive.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file
Examples:
output_low(PIN_A0);
Int16i=PIN_A1;
output_low(PIN_A1);
Example Files:
ex_sqw.c
Also See:
input(), output_high(), output_float(), output_bit(), output_x(), #USE FIXED_IO, #USE FAST_IO,
#USE STANDARD_IO, General Purpose I/O
output_toggle( )
Syntax:
output_toggle(pin)
Parameters:
Pins are defined in the devices .h file. The actual value is a bit address. For example, port a (byte
5 ) bit 3 would have a value of 5*8+3 or 43 . This is defined as follows: #DEFINE PIN_A3 43 .
Returns:
Undefined
Function:
Toggles the high/low state of the specified pin.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file
Examples:
output_toggle(PIN_B4);
Example Files:
None
Also See:
Input(), output_high(), output_low(), output_bit(), output_x()
180
Built-in Functions
perror( )
Syntax:
perror(string);
Parameters:
string is a constant string or array of characters (null terminated).
Returns:
Nothing
Function:
This function prints out to STDERR the supplied string and a description of the last system error
(usually a math error).
Availability:
All devices.
Requires:
#USE RS232, #INCLUDE <errno.h>
Examples:
x = sin(y);
if(errno!=0)
perror("Problem in find_area");
Example Files:
None
Also See:
RS232 I/O Overview
port_x_pullups ( )
Syntax:
port_a_pullups (value)
port_b_pullups (value)
port_d_pullups (value)
port_e_pullups (value)
port_j_pullups (value)
port_x_pullups (upmask)
port_x_pullups (upmask, downmask)
Parameters:
value is TRUE or FALSE on most parts, some parts that allow pullups to be specified on individual
pins permit an 8 bit int here, one bit for each port pin.
upmask for ports that permit pullups to be specified on a pin basis. This mask indicates what pins
should have pullups activated. A 1 indicates the pullups is on.
downmask for ports that permit pulldowns to be specified on a pin basis. This mask indicates what
pins should have pulldowns activated. A 1 indicates the pulldowns is on.
Returns:
undefined
Function:
Sets the input pullups. TRUE will activate, and a FALSE will deactivate.
Availability:
Only 14 and 16 bit devices (PCM and PCH). (Note: use SETUP_COUNTERS on PCB parts).
Requires:
Nothing
Examples:
port_a_pullups(FALSE);
Example Files:
ex_lcdkb.c, kbd.c
Also See:
input(), input_x(), output_float()
181
CCSC_March 2015-1
pow( ) pwr( )
Syntax:
f = pow (x,y)
f = pwr (x,y)
Parameters:
x and y are of type float
Returns:
A float
Function:
Calculates X to the Y power.
Note on error handling:
If "errno.h" is included then the domain and range errors are stored in the errno variable. The
user can check the errno to see if an error has occurred and print the error using the perror
function.
Range error occurs in the following case:
 pow: when the argument X is negative
Availability:
All Devices
Requires:
#INCLUDE <math.h>
Examples:
area = pow (size,3.0);
Example Files:
None
Also See:
None
printf( ) fprintf( )
Syntax:
printf (string)
or
printf (cstring, values...)
or
printf (fname, cstring, values...)
fprintf (stream, cstring, values...)
Parameters:
String is a constant string or an array of characters null terminated.
Values is a list of variables separated by commas, fname is a function name to be used for
outputting (default is putc is none is specified.
Stream is a stream identifier (a constant byte). Note that format specifies do not work in ram
band strings.
Returns:
undefined
Function:
Outputs a string of characters to either the standard RS-232 pins (first two forms) or to a specified
function. Formatting is in accordance with the string argument. When variables are used this
string must be a constant. The % character is used within the string to indicate a variable value is
to be formatted and output. Longs in the printf may be 16 or 32 bit. A %% will output a single
%. Formatting rules for the % follows.
See the Expressions > Constants and Trigraph sections of this manual for other escape character
that may be part of the string.
182
Built-in Functions
If fprintf() is used then the specified stream is used where printf() defaults to STDOUT (the last
USE RS232).
Format:
The format takes the generic form %nt. n is optional and may be 1-9 to specify how many
characters are to be outputted, or 01-09 to indicate leading zeros, or 1.1 to 9.9 for floating point
and %w output. t is the type and may be one of the following:
c
Character
s
String or character
u
Unsigned int
d
Signed int
Lu
Long unsigned int
Ld
Long signed int
x
Hex int (lower case)
X
Hex int (upper case)
Lx
Hex long int (lower case)
LX
Hex long int (upper case)
f
Float with truncated decimal
g
Float with rounded decimal
e
Float in exponential format
w
Unsigned int with decimal place inserted. Specify two
numbers for n. The first is a total field width. The
second is the desired number of decimal places.
Example formats:
Specifier
Value=0x12
%03u
018
%u
18
%2u
18
%5
18
%d
18
%x
12
%X
12
%4X
0012
%3.1w
1.8
* Result is undefined - Assume garbage.
Value=0xfe
254
254
*
254
-2
fe
FE
00FE
25.4
Availability:
All Devices
Requires:
#USE RS232 (unless fname is used)
Examples:
byte x,y,z;
printf("HiThere");
printf("RTCCValue=>%2x\n\r",get_rtcc());
printf("%2u %X %4X\n\r",x,y,z);
printf(LCD_PUTC, "n=%u",n);
Example Files:
ex_admm.c, ex_lcdkb.c
Also See:
atoi(), puts(), putc(), getc() (for a stream example), RS232 I/O Overview
profileout()
Syntax:
profileout(string);
profileout(string, value);
profileout(value);
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CCSC_March 2015-1
Parameters:
Returns:
string is any constant string, and value can be any constant or variable integer. Despite the length
of string the user specifies here, the code profile run-time will actually only send a one or two byte
identifier tag to the code profile tool to keep transmission and execution time to a minimum.
Undefined
Function:
Typically the code profiler will log and display function entry and exits, to show
the call sequence and profile the execution time of the functions. By using
profileout(), the user can add any message or display any variable in the code
profile tool. Most messages sent by profileout() are displayed in the 'Data
Messages' and 'Call Sequence' screens of the code profile tool.
If a profileout(string) is used and the first word of string is "START", the code
profile tool will then measure the time it takes until it sees the same
profileout(string) where the "START" is replaced with "STOP". This measurement
is then displayed in the 'Statistics' screen of the code profile tool, using string as
the name (without "START" or "STOP")
Availability:
Any device.
Requires:
Examples:
#use profile() used somewhere in the project source code.
// send a simple string.
profileout("This is a text string");
// send a variable with a string identifier.
profileout("RemoteSensor=", adc);
// just send a variable.
profileout(adc);
// time how long a block of code takes to execute.
// this will be displayed in the 'Statistics' of the
// Code Profile tool.
profileout("start my algorithm");
/* code goes here */
profileout("stop my algorithm");
Example Files:
ex_profile.c
Also See:
#use profile(), #profile, Code Profile overview
psp_output_full( ) psp_input_full( ) psp_overflow( )
Syntax:
result = psp_output_full()
result = psp_input_full()
result = psp_overflow()
result = psp_error();
result = psp_timeout();
//EPMP only
//EPMP only
Parameters:
None
Returns:
A 0 (FALSE) or 1 (TRUE)
Function:
These functions check the Parallel Slave Port (PSP) for the indicated conditions and return
TRUE or FALSE.
Availability:
This function is only available on devices with PSP hardware on chips.
184
Built-in Functions
Requires:
Nothing
Examples:
while (psp_output_full()) ;
psp_data = command;
while(!psp_input_full()) ;
if ( psp_overflow() )
error = TRUE;
else
data = psp_data;
Example Files:
ex_psp.c
Also See:
setup_psp(), PSP Overview
pwm_off()
Syntax:
Parameters:
Returns:
pwm_off([stream]);
stream – optional parameter specifying the stream defined in #USE PWM.
Nothing.
Function:
Availability:
To turn off the PWM signal.
Requires:
Examples:
#USE PWM
All devices.
#USE PWM(OUTPUT=PIN_C2, FREQUENCY=10kHz, DUTY=25)
while(TRUE){
if(kbhit()){
c = getc();
if(c=='F')
pwm_off();
}
}
Example Files:
Also See:
None
#use_pwm, pwm_on(), pwm_set_duty_percent(), pwm_set_duty(),
pwm_set_frequency()
pwm_on()
Syntax:
Parameters:
Returns:
pwm_on([stream]);
stream – optional parameter specifying the stream defined in #USE PWM.
Nothing.
Function:
Availability:
To turn on the PWM signal.
All devices.
Requires:
Examples:
#USE PWM
#USE PWM(OUTPUT=PIN_C2, FREQUENCY=10kHz, DUTY=25)
while(TRUE){
if(kbhit()){
c = getc();
if(c=='O')
185
CCSC_March 2015-1
pwm_on();
}
}
Example Files:
Also See:
None
#use_pwm, pwm_off(), pwm_set_duty_percent(), pwm_set_duty,
pwm_set_frequency()
pwm_set_duty()
Syntax:
Parameters:
Returns:
Function:
pwm_set_duty([stream],duty);
stream – optional parameter specifying the stream defined in #USE PWM.
duty – an int16 constant or variable specifying the new PWM high time.
Nothing.
Availability:
To change the duty cycle of the PWM signal. The duty cycle percentage depends on
the period of the PWM signal. This function is faster than pwm_set_duty_percent(),
but requires you to know what the period of the PWM signal is.
All devices.
Requires:
#USE PWM
Examples:
#USE PWM(OUTPUT=PIN_C2, FREQUENCY=10kHz, DUTY=25)
Example Files:
Also See:
None
#use_pwm, pwm_on, pwm_off(), pwm_set_frequency(), pwm_set_duty_percent()
pwm_set_duty_percent
Syntax:
Parameters:
Returns:
Function:
Availability:
pwm_set_duty_percent([stream]), percent
stream – optional parameter specifying the stream defined in #USE PWM.
percent- an int16 constant or variable ranging from 0 to 1000 specifying the new PWM duty cycle, D
is 0% and 1000 is 100.0%.
Nothing.
To change the duty cycle of the PWM signal. Duty cycle percentage is based off the current
frequency/period of the PWM signal.
All devices.
Requires:
Examples:
#USE PWM
Example Files:
Also See:
None
#use_pwm, pwm_on(), pwm_off(), pwm_set_frequency(), pwm_set_duty()
#USE PWM(OUTPUT=PIN_C2, FREQUENCY=10kHz, DUTY=25)
pwm_set_duty_percent(500);
//set PWM duty cycle to 50%
pwm_set_frequency
Syntax:
Parameters:
186
pwm_set_frequency([stream],frequency);
stream – optional parameter specifying the stream defined in #USE PWM.
Built-in Functions
frequency – an int32 constant or variable specifying the new PWM frequency.
Nothing.
Returns:
Function:
To change the frequency of the PWM signal. Warning this may change the resolution
of the PWM signal.
All devices.
Availability:
Requires:
Examples:
#USE PWM
Example Files:
Also See:
None
#use_pwm, pwm_on(), pwm_off(), pwm_set_duty_percent, pwm_set_duty()
#USE PWM(OUTPUT=PIN_C2, FREQUENCY=10kHz, DUTY=25)
pwm_set_frequency(1000);
//set PWM frequency to 1kHz
qei_get_count( )
Syntax:
value = qei_get_count( [type] );
Parameters:
type - Optional parameter to specify which counter to get, defaults to position counter. Defined in devices
.h file as:
QEI_GET_POSITION_COUNT
QEI_GET_VELOCITY_COUNT
Returns:
The 16-bit value of the position counter or velocity counter.
Function:
Reads the current 16-bit value of the position or velocity counter.
Availability:
Devices that have the QEI module.
Requires:
Nothing.
Examples:
value = qei_get_counter(QEI_GET_POSITION_COUNT);
value = qei_get_counter();
value = qei_get_counter(QEI_GET_VELOCITY_COUNT);
Example
Files:
Also See:
None
setup_qei() , qei_set_count() , qei_status().
qei_set_count( )
Syntax:
qei_set_count( value );
Parameters:
value- The 16-bit value of the position counter.
Returns:
void
Function:
Write a 16-bit value to the position counter.
Availability:
Devices that have the QEI module.
Requires:
Nothing.
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CCSC_March 2015-1
Examples:
qei_set_counter(value);
Example Files:
None
Also See:
setup_qei() , qei_get_count() , qei_status().
qei_status( )
Syntax:
status = qei_status( );
Parameters:
None
Returns:
The status of the QEI module.
Function:
Returns the status of the QEI module.
Availability:
Devices that have the QEI module.
Requires:
Nothing.
Examples:
status = qei_status();
Example Files:
None
Also See:
setup_qei() , qei_set_count() , qei_get_count().
qsort( )
Syntax:
qsort (base, num, width, compare)
Parameters:
base: Pointer to array of sort data
num: Number of elements
width: Width of elements
compare: Function that compares two elements
Returns:
None
Function:
Performs the shell-metzner sort (not the quick sort algorithm). The contents of the array are sorted
into ascending order according to a comparison function pointed to by compare.
Availability:
All devices
Requires:
#INCLUDE <stdlib.h>
Examples:
int nums[5]={ 2,3,1,5,4};
int compar(void *arg1,void *arg2);
void main() {
qsort ( nums, 5, sizeof(int), compar);
}
int compar(void *arg1,void *arg2) {
if ( * (int *) arg1 < ( * (int *) arg2) return –1
188
Built-in Functions
else if ( * (int *) arg1 == ( * (int *) arg2) return 0
else return 1;
}
Example Files:
ex_qsort.c
Also See:
bsearch()
rand( )
Syntax:
re=rand()
Parameters:
None
Returns:
A pseudo-random integer.
Function:
The rand function returns a sequence of pseudo-random integers in the range of 0 to
RAND_MAX.
Availability:
All devices
Requires:
#INCLUDE <STDLIB.H>
Examples:
int I;
I=rand();
Example Files:
None
Also See:
srand()
rcv_buffer_bytes( )
Syntax:
Parameters:
Returns:
value = rcv_buffer_bytes([stream]);
stream – optional parameter specifying the stream defined in #USE RS232.
Number of bytes in receive buffer that still need to be retrieved.
Function:
Function to determine the number of bytes in receive buffer that still need to be retrieved.
Availability:
All devices
Requires:
Examples:
#USE RS232
#USE_RS232(UART1,BAUD=9600,RECEIVE_BUFFER=100)
void main(void) {
char c;
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CCSC_March 2015-1
if(rcv_buffer_bytes() > 10)
c = getc();
Example Files:
Also See:
}
None
_USE_RS232( ), RCV_BUFFER_FULL( ), TX_BUFFER_FULL( ), TX_BUFFER_BYTES( ), GETC(
), PUTC( ) ,PRINTF( ), SETUP_UART( ), PUTC_SEND( )
rcv_buffer_full( )
Syntax:
Parameters:
Returns:
Function:
value = rcv_buffer_full([stream]);
stream – optional parameter specifying the stream defined in #USE RS232.
TRUE if receive buffer is full, FALSE otherwise.
Function to test if the receive buffer is full.
Availability:
All devices
Requires:
Examples:
#USE RS232
#USE_RS232(UART1,BAUD=9600,RECEIVE_BUFFER=100)
void main(void) {
char c;
if(rcv_buffer_full())
c = getc();
}
None
Example Files:
Also See:
_USE_RS232( ),RCV_BUFFER_BYTES( ), TX_BUFFER_BYTES( ) ,TX_BUFFER_FULL( ),
GETC( ), PUTC( ), PRINTF( ), SETUP_UART( ), PUTC_SEND( )
read_adc( )
Syntax:
value = read_adc ([mode])
Parameters:
mode is an optional parameter. If used the values may be:
ADC_START_AND_READ (continually takes readings, this is the default)
ADC_START_ONLY (starts the conversion and returns)
ADC_READ_ONLY (reads last conversion result)
Returns:
Either a 8 or 16 bit int depending on #DEVICE ADC= directive.
Function:
This function will read the digital value from the analog to digital converter. Calls to setup_adc(),
setup_adc_ports() and set_adc_channel() should be made sometime before this function is
called. The range of the return value depends on number of bits in the chips A/D converter and
the setting in the #DEVICE ADC= directive as follows:
#DEVICE
8 bit
10 bit
11 bit
12 bit
16 bit
ADC=8
00-FF
00-FF
00-FF
00-FF
00-FF
ADC=10
x
0-3FF
x
0-3FF
x
ADC=11
x
x
0-7FF
x
x
ADC=16
0FF00
0-FFC0
0-FFEO
0-FFF0
0-FFFF
Note: x is not defined
Availability:
This function is only available on devices with A/D hardware.
190
Built-in Functions
Requires:
Pin constants are defined in the devices .h file.
Examples:
setup_adc( ADC_CLOCK_INTERNAL );
setup_adc_ports( ALL_ANALOG );
set_adc_channel(1);
while ( input(PIN_B0) ) {
delay_ms( 5000 );
value = read_adc();
printf("A/D value = %2x\n\r", value);
}
read_adc(ADC_START_ONLY);
sleep();
value=read_adc(ADC_READ_ONLY);
Example
Files:
Also See:
ex_admm.c, ex_14kad.c
setup_adc(), set_adc_channel(), setup_adc_ports(), #DEVICE, ADC Overview
read_bank( )
Syntax:
value = read_bank (bank, offset)
Parameters:
bank is the physical RAM bank 1-3 (depending on the device)
offset is the offset into user RAM for that bank (starts at 0),
Returns:
8 bit int
Function:
Read a data byte from the user RAM area of the specified memory bank. This function may be
used on some devices where full RAM access by auto variables is not efficient. For example,
setting the pointer size to 5 bits on the PIC16C57 chip will generate the most efficient ROM code.
However, auto variables can not be above 1Fh. Instead of going to 8 bit pointers, you can save
ROM by using this function to read from the hard-to-reach banks. In this case, the bank may be 13 and the offset may be 0-15.
Availability:
All devices but only useful on PCB parts with memory over 1Fh
and PCM parts with memory over FFh.
Requires:
Nothing
Examples:
// See write_bank() example to see
// how we got the data
// Moves data from buffer to LCD
i=0;
do {
c=read_bank(1,i++);
if(c!=0x13)
lcd_putc(c);
} while (c!=0x13);
Example Files:
ex_psp.c
Also See:
write_bank(), and the "Common Questions and Answers" section for more information.
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CCSC_March 2015-1
read_calibration( )
Syntax:
value = read_calibration (n)
Parameters:
n is an offset into calibration memory beginning at 0
Returns:
An 8 bit byte
Function:
The read_calibration function reads location "n" of the 14000-calibration memory.
Availability:
This function is only available on the PIC14000.
Requires:
Nothing
Examples:
fin = read_calibration(16);
Example Files:
ex_14kad.c with 14kcal.c
Also See:
None
read_configuration_memory( )
Syntax:
read_configuration_memory(ramPtr, n)
Parameters:
ramPtr is the destination pointer for the read results
count is an 8 bit integer
Returns:
undefined
Function:
Reads n bytes of configuration memory and saves the values to ramPtr.
Availability:
All
Requires:
Nothing
Examples:
int data[6];
read_configuration_memory(data,6);
Example Files:
None
Also See:
write_configuration_memory(), read_program_memory(), Configuration Memory Overview,
read_eeprom( )
Syntax:
value = read_eeprom (address )
Parameters:
address is an 8 bit or 16 bit int depending on the part
Returns:
An 8 bit int
192
Built-in Functions
Function:
Reads a byte from the specified data EEPROM address. The address begins at 0 and the range
depends on the part.
Availability:
This command is only for parts with built-in EEPROMS
Requires:
Nothing
Examples:
#define LAST_VOLUME 10
volume = read_EEPROM (LAST_VOLUME);
Example Files:
None
Also See:
write_eeprom(), Data Eeprom Overview
read_extended_ram( )
Syntax:
read_extended_ram(page,address,data,count);
Parameters:
page – the page in extended RAM to read from
address – the address on the selected page to start reading from
data – pointer to the variable to return the data to
count – the number of bytes to read (0-32768)
Returns:
Undefined
Function:
To read data from the extended RAM of the PIC.
Availability:
On devices with more then 30K of RAM.
Requires:
Nothing
Examples:
unsigned int8 data[8];
read_extended_ram(1,0x0000,data,8);
Example Files:
None
Also See:
read_extended_ram(), Extended RAM Overview
read_program_memory( )
read_external_memory( )
Syntax:
READ_PROGRAM_MEMORY (address, dataptr, count );
READ_EXTERNAL_MEMORY (address, dataptr, count );
Parameters:
address is 16 bits on PCM parts and 32 bits on PCH parts . The least significant bit should always
be 0 in PCM.
dataptr is a pointer to one or more bytes.
count is a 8 bit integer on PIC16 and 16-bit for PIC18
Returns:
undefined
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CCSC_March 2015-1
Function:
Reads count bytes from program memory at address to RAM at dataptr. B oth of these functions
operate exactly the same.
Availability:
Only devices that allow reads from program memory.
Requires:
Nothing
Examples:
char buffer[64];
read_external_memory(0x40000, buffer, 64);
Example Files:
None
Also See:
write program memory( ), External memory overview , Program Eeprom Overview
read_high_speed_adc( )
Syntax:
read_high_speed_adc(pair,mode,result);
read_high_speed_adc(pair,result);
read_high_speed_adc(pair);
read_high_speed_adc(mode,result);
read_high_speed_adc(result);
read_high_speed_adc();
Parameters:
// Individual start and read or
// read only
// Individual start and read
// Individual start only
// Global start and read or
// read only
// Global start and read
// Global start only
pair – Optional parameter that determines which ADC pair number to start and/or read. Valid
values are 0 to total number of ADC pairs. 0 starts and/or reads ADC pair AN0 and AN1, 1 starts
and/or reads ADC pair AN2 and AN3, etc. If omitted then a global start and/or read will be
performed.
mode – Optional parameter, if used the values may be:
· ADC_START_AND_READ (starts conversion and reads result)
· ADC_START_ONLY (starts conversion and returns)
· ADC_READ_ONLY(reads conversion result)
result – Pointer to return ADC conversion too. Parameter is optional, if not used the
read_fast_adc() function can only perform a start.
Returns:
Undefined
Function:
This function is used to start an analog to digital conversion and/or read the digital
value when the conversion is complete. Calls to setup_high_speed_adc() and
setup_high_speed_adc_pairs() should be made sometime before this function is
called.
When using this function to perform an individual start and read or individual start
only, the function assumes that the pair's trigger source was set to
INDIVIDUAL_SOFTWARE_TRIGGER.
When using this function to perform a global start and read, global start only, or
global read only. The function will perform the following steps:
1.
Determine which ADC pairs are set for
GLOBAL_SOFTWARE_TRIGGER.
2.
Clear the corresponding ready flags (if doing a start).
194
Built-in Functions
3.
Set the global software trigger (if doing a start).
4.
Read the corresponding ADC pairs in order from lowest to highest
(if doing a read).
5.
Clear the corresponding ready flags (if doing a read).
When using this function to perform a individual read only. The function can read
the ADC result from any trigger source.
Availability:
Only on dsPIC33FJxxGSxxx devices.
Requires:
Constants are define in the device .h file.
Examples:
//Individual start and read
int16 result[2];
setup_high_speed_adc(ADC_CLOCK_DIV_4);
setup_high_speed_adc_pair(0, INDIVIDUAL_SOFTWARE_TRIGGER);
read_high_speed_adc(0, result); //starts conversion for AN0 and AN1 and stores
//result in result[0] and result[1]
//Global start and read
int16 result[4];
setup_high_speed_adc(ADC_CLOCK_DIV_4);
setup_high_speed_adc_pair(0, GLOBAL_SOFTWARE_TRIGGER);
setup_high_speed_adc_pair(4, GLOBAL_SOFTWARE_TRIGGER);
read_high_speed_adc(result); //starts conversion for AN0, AN1,
//AN8 and AN9 and
//stores result in result[0], result //[1], result[2]
and result[3]
Example Files:
None
Also See:
setup_high_speed_adc(), setup_high_speed_adc_pair(), high_speed_adc_done()
read_rom_memory( )
Syntax:
READ_ROM_MEMORY (address, dataptr, count );
Parameters:
address is 32 bits. The least significant bit should always be 0.
dataptr is a pointer to one or more bytes.
count is a 16 bit integer
Returns:
undefined
Function:
Reads count bytes from program memory at address to dataptr. Due to the 24 bit program instruction
size on the PCD devices, three bytes are read from each address location.
Availability:
Only devices that allow reads from program memory.
Requires:
Nothing
Examples:
char buffer[64];
read_program_memory(0x40000, buffer, 64);
Example
Files:
Also See:
None
write_program_eeprom() , write_eeprom(), read_eeprom(), Program eeprom overview
195
CCSC_March 2015-1
read_sd_adc( )
Syntax:
value = read_sd_adc();
Parameters:
None
Returns:
A signed 32 bit int.
Function:
To poll the SDRDY bit and if set return the signed 32 bit value stored in the SD1RESH and SD1RESL
registers, and clear the SDRDY bit. The result returned depends on settings made with the setup_sd_adc()
function, but will always be a signed int32 value with the most significant bits being meaningful. Refer to
Section 66, 16-bit Sigma-Delta A/D Converter, of the PIC24F Family Reference Manual for more
information on the module and the result format.
Availability:
Only devices with a Sigma-Delta Analog to Digital Converter (SD ADC) module.
Examples:
value = read_sd_adc()
Example
Files:
Also See:
None
setup_sd_adc(), set_sd_adc_calibration(), set_sd_adc_channel()
realloc( )
Syntax:
realloc (ptr, size)
Parameters:
ptr is a null pointer or a pointer previously returned by calloc or malloc or realloc function, size is
an integer representing the number of byes to be allocated.
Returns:
A pointer to the possibly moved allocated memory, if any. Returns null otherwise.
Function:
The realloc function changes the size of the object pointed to by the ptr to the size specified by
the size. The contents of the object shall be unchanged up to the lesser of new and old sizes. If
the new size is larger, the value of the newly allocated space is indeterminate. If ptr is a null
pointer, the realloc function behaves like malloc function for the specified size. If the ptr does not
match a pointer earlier returned by the calloc, malloc or realloc, or if the space has been
deallocated by a call to free or realloc function, the behavior is undefined. If the space cannot be
allocated, the object pointed to by ptr is unchanged. If size is zero and the ptr is not a null pointer,
the object is to be freed.
Availability:
All devices
Requires:
#INCLUDE <stdlibm.h>
Examples:
int * iptr;
iptr=malloc(10);
realloc(iptr,20)
// iptr will point to a block of memory of 20 bytes, if available.
Example Files:
196
None
Built-in Functions
Also See:
malloc(), free(), calloc()
release_io()
Syntax:
release_io();
Parameters:
none
Returns:
Function:
nothing
The function releases the I/O pins after the device wakes up from deep sleep, allowing
the state of the I/O pins to change
Availability:
Devices with a deep sleep module.
Requires:
Nothing
Examples:
unsigned int16 restart;
restart = restart_cause();
if(restart == RTC_FROM_DS)
release_io();
Example Files:
None
Also See:
sleep()
reset_cpu( )
Syntax:
reset_cpu()
Parameters:
None
Returns:
This function never returns
Function:
This is a general purpose device reset. It will jump to location 0 on PCB and PCM parts and also
reset the registers to power-up state on the PIC18XXX.
Availability:
All devices
Requires:
Nothing
Examples:
if(checksum!=0)
reset_cpu();
Example Files:
None
Also See:
None
197
CCSC_March 2015-1
restart_cause( )
Syntax:
value = restart_cause()
Parameters:
None
Returns:
A value indicating the cause of the last processor reset. The actual values are device
dependent. See the device .h file for specific values for a specific device. Some example values
are: WDT_FROM_SLEEP, WDT_TIMEOUT, MCLR_FROM_SLEEP and NORMAL_POWER_UP.
Function:
Returns the cause of the last processor reset.
Availability:
All devices
Requires:
Constants are defined in the devices .h file.
Examples:
switch ( restart_cause() ) {
case WDT_FROM_SLEEP:
case WDT_TIMEOUT:
handle_error();
}
Example Files:
ex_wdt.c
Also See:
restart_wdt(), reset_cpu()
restart_wdt( )
Syntax:
restart_wdt()
Parameters:
None
Returns:
undefined
Function:
Restarts the watchdog timer. If the watchdog timer is enabled, this must be called
periodically to prevent the processor from resetting.
The watchdog timer is used to cause a hardware reset if the software appears to
be stuck.
The timer must be enabled, the timeout time set and software must periodically
restart the timer. These are done differently on the PCB/PCM and PCH parts as
follows:
Enable/Disable
Timeout time
restart
Availability:
All devices
Requires:
#FUSES
Examples:
#fuses WDT
198
PCB/PCM
#fuses
setup_wdt()
restart_wdt()
PCH
setup_wdt()
#fuses
restart_wdt()
// PCB/PCM example
// See setup_wdt for a
// PIC18 example
Built-in Functions
main() {
setup_wdt(WDT_2304MS);
while (TRUE) {
restart_wdt();
perform_activity();
}
}
Example
Files:
Also See:
ex_wdt.c
#FUSES, setup_wdt(), WDT or Watch Dog Timer Overview
rotate_left( )
Syntax:
rotate_left (address, bytes)
Parameters:
address is a pointer to memory
bytes is a count of the number of bytes to work with.
Returns:
undefined
Function:
Rotates a bit through an array or structure. The address may be an array identifier or an
address to a byte or structure (such as &data). Bit 0 of the lowest BYTE in RAM is considered
the LSB.
Availability:
All devices
Requires:
Nothing
Examples:
x = 0x86;
rotate_left( &x, 1);
// x is now 0x0d
Example Files:
None
Also See:
rotate_right(), shift_left(), shift_right()
rotate_right( )
Syntax:
rotate_right (address, bytes)
Parameters:
address is a pointer to memory,
bytes is a count of the number of bytes to work with.
Returns:
undefined
Function:
Rotates a bit through an array or structure. The address may be an array identifier or an address
to a byte or structure (such as &data). Bit 0 of the lowest BYTE in RAM is considered the LSB.
Availability:
All devices
Requires:
Nothing
Examples:
struct {
199
CCSC_March 2015-1
int cell_1
int cell_2
int cell_3
int cell_4
rotate_right(
rotate_right(
rotate_right(
rotate_right(
// cell_1->4,
: 4;
: 4;
: 4;
: 4; } cells;
&cells, 2);
&cells, 2);
&cells, 2);
&cells, 2);
2->1, 3->2 and 4-> 3
Example Files:
None
Also See:
rotate_left(), shift_left(), shift_right()
rtc_alarm_read( )
Syntax:
rtc_alarm_read(&datetime);
Parameters:
datetime- A structure that will contain the values to be written to the alarm in the RTCC module.
Returns:
Structure used in read and write functions are defined in the device header file
as rtc_time_t
void
Function:
Reads the date and time from the alarm in the RTCC module to structure datetime.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
Examples:
rtc_alarm_read(&datetime);
Example Files:
None
Also See:
rtc_read(), rtc_alarm_read(), rtc_alarm_write(), setup_rtc_alarm(), rtc_write(), setup_rtc()
rtc_alarm_write( )
Syntax:
rtc_alarm_write(&datetime);
Parameters:
datetime- A structure that will contain the values to be written to the alarm in the RTCC module.
Structure used in read and write functions are defined in the device header file as rtc_time_t.
Returns:
void
Function:
Writes the date and time to the alarm in the RTCC module as specified in the structure date time.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
200
Built-in Functions
Examples:
rtc_alarm_write(&datetime);
Example Files:
None
Also See:
rtc_read(), rtc_alarm_read(), rtc_alarm_write(), setup_rtc_alarm(), rtc_write(), setup_rtc()
rtc_read( )
Syntax:
rtc_read(&datetime);
Parameters:
datetime- A structure that will contain the values returned by the RTCC module.
Structure used in read and write functions are defined in the device header file as rtc_time_t.
Returns:
void
Function:
Reads the current value of Time and Date from the RTCC module and stores the structure date
time.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
Examples:
rtc_read(&datetime);
Example Files:
ex_rtcc.c
Also See:
rtc_read(), rtc_alarm_read(), rtc_alarm_write(), setup_rtc_alarm(), rtc_write(), setup_rtc()
rtc_write( )
Syntax:
rtc_write(&datetime);
Parameters:
datetime- A structure that will contain the values to be written to the RTCC module.
Structure used in read and write functions are defined in the device header file as rtc_time_t.
Returns:
void
Function:
Writes the date and time to the RTCC module as specified in the structure date time.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
Examples:
rtc_write(&datetime);
Example Files:
ex_rtcc.c
Also See:
rtc_read() , rtc_alarm_read() , rtc_alarm_write() , setup_rtc_alarm() , rtc_write(), setup_rtc()
201
CCSC_March 2015-1
rtos_await( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_await (expre)
Parameters:
expre is a logical expression.
Returns:
None
Function:
This function can only be used in an RTOS task. This function waits for expre to be true before
continuing execution of the rest of the code of the RTOS task. This function allows other tasks to
execute while the task waits for expre to be true.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_await(kbhit());
Also See:
None
rtos_disable( )
The RTOS is only included in the PCW, PCWH, and PCWHD software packages.
Syntax:
rtos_disable (task)
Parameters:
task is the identifier of a function that is being used as an RTOS task.
Returns:
None
Function:
This function disables a task which causes the task to not execute until enabled by rtos_enable().
All tasks are enabled by default.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_disable(toggle_green)
Also See:
rtos enable()
202
Built-in Functions
rtos_enable( )
The RTOS is only included in the PCW, PCWH, and PCWHD software packages.
Syntax:
rtos_enable (task)
Parameters:
task is the identifier of a function that is being used as an RTOS task.
Returns:
None
Function:
This function enables a task to execute at it's specified rate.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_enable(toggle_green);
Also See:
rtos disable()
rtos_msg_poll( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
i = rtos_msg_poll()
Parameters:
None
Returns:
An integer that specifies how many messages are in the queue.
Function:
This function can only be used inside an RTOS task. This function returns the number of
messages that are in the queue for the task that the rtos_msg_poll() function is used in.
Availability:
All devices
Requires:
#USE RTOS
Examples:
if(rtos_msg_poll())
Also See:
rtos msg send(), rtos msg read()
rtos_msg_read( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
b = rtos_msg_read()
Parameters:
None
203
CCSC_March 2015-1
Returns:
A byte that is a message for the task.
Function:
This function can only be used inside an RTOS task. This function reads in the next (message) of
the queue for the task that the rtos_msg_read() function is used in.
Availability:
All devices
Requires:
#USE RTOS
Examples:
if(rtos_msg_poll()) {
b = rtos_msg_read();
Also See:
rtos msg poll(), rtos msg send()
rtos_msg_send( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_msg_send(task, byte)
Parameters:
task is the identifier of a function that is being used as an RTOS task
byte is the byte to send to task as a message.
Returns:
None
Function:
This function can be used anytime after rtos_run() has been called.
This function sends a byte long message (byte) to the task identified by task.
Availability:
All devices
Requires:
#USE RTOS
Examples:
if(kbhit())
{
rtos_msg_send(echo, getc());
}
Also See:
rtos_msg_poll(), rtos_msg_read()
rtos_overrun( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_overrun([task])
Parameters:
task is an optional parameter that is the identifier of a function that is being used as an RTOS task
Returns:
A 0 (FALSE) or 1 (TRUE)
Function:
This function returns TRUE if the specified task took more time to execute than it was allocated. If
no task was specified, then it returns TRUE if any task ran over it's alloted execution time.
Availability:
All devices
204
Built-in Functions
Requires:
#USE RTOS(statistics)
Examples:
rtos_overrun()
Also See:
None
rtos_run( )
The RTOS is only included in the PCW, PCWH, and PCWHD software packages.
Syntax:
rtos_run()
Parameters:
None
Returns:
None
Function:
This function begins the execution of all enabled RTOS tasks. This function controls the execution
of the RTOS tasks at the allocated rate for each task. This function will return only when
rtos_terminate() is called.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_run()
Also See:
rtos terminate()
rtos_signal( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_signal (sem)
Parameters:
sem is a global variable that represents the current availability of a shared
system resource (a semaphore).
Returns:
None
Function:
This function can only be used by an RTOS task. This function increments sem to let waiting
tasks know that a shared resource is available for use.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_signal(uart_use)
Also See:
rtos wait()
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CCSC_March 2015-1
rtos_stats( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_stats(task,&stat)
Parameters:
Returns:
task is the identifier of a function that is being used as an RTOS task.
stat is a structure containing the following:
struct rtos_stas_struct {
unsigned int32 task_total_ticks; //number of ticks the task has
//used
unsigned int16 task_min_ticks; //the minimum number of ticks
//used
unsigned int16 task_max_ticks; //the maximum number of ticks
//used
unsigned int16 hns_per_tick;
//us = (ticks*hns_per_tick)/10
};
Undefined
Function:
This function returns the statistic data for a specified task.
Availability:
All devices
Requires:
#USE RTOS(statistics)
Examples:
rtos_stats(echo, &stats)
Also See:
None
rtos_terminate( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_terminate()
Parameters:
None
Returns:
None
Function:
This function ends the execution of all RTOS tasks. The execution of the program will continue
with the first line of code after the rtos_run() call in the program. (This function causes rtos_run()
to return.)
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_terminate()
Also See:
rtos run()
206
Built-in Functions
rtos_wait( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_wait (sem)
Parameters:
sem is a global variable that represents the current availability of a shared
system resource (a semaphore).
Returns:
None
Function:
This function can only be used by an RTOS task. This function waits for sem to be greater than 0
(shared resource is available), then decrements sem to claim usage of the shared resource and
continues the execution of the rest of the code the RTOS task. This function allows other tasks to
execute while the task waits for the shared resource to be available.
Availability:
All devices
Requires:
#USE RTOS
Examples:
rtos_wait(uart_use)
Also See:
rtos signal()
rtos_yield( )
The RTOS is only included in the PCW, PCWH and PCWHD software packages.
Syntax:
rtos_yield()
Parameters:
None
Returns:
None
Function:
This function can only be used in an RTOS task. This function stops the execution of the current
task and returns control of the processor to rtos_run(). When the next task executes, it will start
it's execution on
the line of code after the rtos_yield().
Availability:
All devices
Requires:
#USE RTOS
Examples:
void yield(void)
{
printf(“Yielding...\r\n”);
rtos_yield();
printf(“Executing code after yield\r\n”);
}
Also See:
None
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CCSC_March 2015-1
set_adc_channel( )
Syntax:
set_adc_channel (chan [,neg]))
Parameters:
chan is the channel number to select. Channel numbers start at 0 and are labeled in the data sheet AN0,
AN1. For devices with a differential ADC it sets the positive channel to use.
neg is optional and is used for devices with a differential ADC only. It sets the negative channel to use,
channel numbers can be 0 to 6 or VSS. If no parameter is used the negative channel will be set to VSS by
default.
Returns:
undefined
Function:
Specifies the channel to use for the next read_adc() call. Be aware that you must wait a short time after
changing the channel before you can get a valid read. The time varies depending on the impedance of the
input source. In general 10us is good for most applications. You need not change the channel before every
read if the channel does not change.
Availability:
This function is only available on devices with A/D hardware.
Requires:
Nothing
Examples:
set_adc_channel(2);
delay_us(10);
value = read_adc();
Example
Files:
Also See:
ex_admm.c
read_adc(), setup_adc(), setup_adc_ports(), ADC Overview
scanf( )
printf( )
Syntax:
scanf(cstring);
scanf(cstring, values...)
fscanf(stream, cstring, values...)
Parameters:
cstring is a constant string.
values is a list of variables separated by commas.
stream is a stream identifier.
Returns:
0 if a failure occurred, otherwise it returns the number of conversion specifiers that were read in, plus the
number of constant strings read in.
Function:
Reads in a string of characters from the standard RS-232 pins and formats the string according to the
format specifiers. The format specifier character (%) used within the string indicates that a conversion
specification is to be done and the value is to be saved into the corresponding argument variable. A %%
will input a single %. Formatting rules for the format specifier as follows:
If fscanf() is used, then the specified stream is used, where scanf() defaults to STDIN (the last USE RS232).
208
Built-in Functions
Format:
The format takes the generic form %nt. n is an option and may be 1-99 specifying the field width, the
number of characters to be inputted. t is the type and maybe one of the following:
c
Matches a sequence of characters of the number specified by the field width (1 if no field
width is specified). The corresponding argument shall be a pointer to the initial character
of an array long enough to accept the sequence.
s
Matches a sequence of non-white space characters. The corresponding argument shall be
a pointer to the initial character of an array long enough to accept the sequence and a
terminating null character, which will be added automatically.
u
Matches an unsigned decimal integer. The corresponding argument shall be a pointer to an
unsigned integer.
Lu
Matches a long unsigned decimal integer. The corresponding argument shall be a pointer to
a long unsigned integer.
d
Matches a signed decimal integer. The corresponding argument shall be a pointer to a
signed integer.
Ld
Matches a long signed decimal integer. The corresponding argument shall be a pointer to a
long signed integer.
o
Matches a signed or unsigned octal integer. The corresponding argument shall be a pointer
to a signed or unsigned integer.
Lo
Matches a long signed or unsigned octal integer. The corresponding argument shall be a
pointer to a long signed or unsigned integer.
x or X
Matches a hexadecimal integer. The corresponding argument shall be a pointer to a signed
or unsigned integer.
Lx or LX
Matches a long hexadecimal integer. The corresponding argument shall be a pointer to a
long signed or unsigned integer.
i
Matches a signed or unsigned integer. The corresponding argument shall be a pointer to a
signed or unsigned integer.
Li
Matches a long signed or unsigned integer. The corresponding argument shall be a pointer
to a long signed or unsigned integer.
f,g or e
Matches a floating point number in decimal or exponential format. The corresponding
argument shall be a pointer to a float.
[
Matches a non-empty sequence of characters from a set of expected characters. The
sequence of characters included in the set are made up of all character following the left
bracket ([) up to the matching right bracket (]). Unless the first character after the left
bracket is a ^, in which case the set of characters contain all characters that do not
appear between the brackets. If a - character is in the set and is not the first or second,
where the first is a ^, nor the last character, then the set includes all characters from the
character before the - to the character after the -.
For example, %[a-z] would include all characters from a to z in the set and %[^a-z] would
exclude all characters from a to z from the set. The corresponding argument shall be a
pointer to the initial character of an array long enough to accept the sequence and a
terminating null character, which will be added automatically.
n
Assigns the number of characters read thus far by the call to scanf() to the corresponding
argument. The corresponding argument shall be a pointer to an unsigned integer.
An optional assignment-suppressing character (*) can be used after the format specifier to
indicate that the conversion specification is to be done, but not saved into a
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CCSC_March 2015-1
corresponding variable. In this case, no corresponding argument variable should be
passed to the scanf() function.
A string composed of ordinary non-white space characters is executed by reading the next
character of the string. If one of the inputted characters differs from the string, the
function fails and exits. If a white-space character precedes the ordinary non-white space
characters, then white-space characters are first read in until a non-white space character
is read.
White-space characters are skipped, except for the conversion specifiers [, c or n, unless a
white-space character precedes the [ or c specifiers.
Availability:
All Devices
Requires:
#USE RS232
Examples:
char name[2-];
unsigned int8 number;
signed int32 time;
if(scanf("%u%s%ld",&number,name,&time))
printf"\r\nName: %s, Number: %u, Time: %ld",name,number,time);
Example
Files:
Also See:
None
RS232 I/O Overview, getc(), putc(), printf()
set_cog_blanking( )
Syntax:
Parameters:
set_cog_blanking(falling_time, rising_time);
falling time - sets the falling edge blanking time.
rising time - sets the rising edge blanking time.
Returns:
Nothing
Function:
To set the falling and rising edge blanking times on the Complementary
Output Generator (COG) module. The time is based off the source clock of the COG
module, the times are either a 4-bit or 6-bit value, depending on the device, refer to the
device's datasheet for the correct width.
Availability:
All devices with a COG module.
Examples:
set_cog_blanking(10,10);
Example
Files:
Also See:
None
210
setup_cog(), set_cog_phase(), set_cog_dead_band(), cog_status(), cog_restart()
Built-in Functions
set_cog_dead_band( )
Syntax:
set_cog_dead_band(falling_time, rising_time);
Parameter
falling time - sets the falling edge dead-band time.
s
rising
:
time - sets the rising edge dead-band time.
Returns:
Nothing
Function:
To set the falling and rising edge dead-band times on the Complementary
Output Generator (COG) module. The time is based off the source clock of the COG
module, the times are either a 4-bit or 6-bit value, depending on the device, refer to the
device's datasheet for the correct width.
Availabilit
All devices with a COG module.
y
:
Examples
set_cog_dead_band(16,32);
Example
Also See:
:
None
F
i
l
e
s
:
setup_cog(), set_cog_phase(), set_cog_blanking(), cog_status(), cog_restart()
set_cog_phase( )
Syntax:
set_cog_phase(rising_time);
set_cog_phase(falling_time, rising_time);
Parameter
falling time - sets the falling edge phase time.
s
rising
:
time - sets the rising edge phase time.
Returns:
Nothing
Function:
To set the falling and rising edge phase times on the Complementary
Output Generator (COG) module. The time is based off the source clock of the COG
module, the times are either a 4-bit or 6-bit value, depending on the device.
Some devices only have a rising edge delay, refer to the device's datasheet.
Availabilit
All devices with a COG module.
y
:
Examples:
set_cog_phase(10,10);
211
CCSC_March 2015-1
Example
Files:
Also See:
None
setup_cog(), set_cog_dead_band(), set_cog_blanking(), cog_status(), cog_restart()
.
set_compare_time( )
Syntax:
set_compare_time(x, ocr, [ocrs]])
Parameters:
x is 1-16 and defines which output compare module to set time for
ocr is the compare time for the primary compare register.
ocrs is the optional compare time for the secondary register. Used for dual compare mode.
Returns:
None
Function:
This function sets the compare value for the output compare module. If the output compare module is to
perform only a single compare than the ocrs register is not used. If the output compare module is using
double compare to generate an output pulse, the ocr signifies the start of the pulse and ocrs defines the
pulse termination time.
Availability:
Only available on devices with output compare modules.
Requires:
Nothing
Examples:
// Pin OC1 will be set when timer 2 is equal to 0xF000
setup_timer2(TMR_INTERNAL | TIMER_DIV_BY_8);
setup_compare_time(1, 0xF000);
setup_compare(1, COMPARE_SET_ON_MATCH | COMPARE_TIMER2);
Example
Files:
Also See:
None
get_capture( ), setup_compare( ), Output Compare, PWM Overview
set_nco_inc_value( )
Syntax:
set_nco_inc_value(value);
Parameters:
value- 16-bit value to set the NCO increment registers to (0 - 65535)
Returns:
Undefined
Function:
Sets the value that the NCO's accumulator will be incremented by on each clock pulse. The
increment registers are double buffered so the new value won't be applied until the
accumulator rolls-over.
Availability:
On devices with a NCO module.
212
Built-in Functions
Examples:
set_nco_inc_value(inc_value);
Example
Files:
Also See:
None
Syntax:
set_open_drain_a(value)
set_open_drain_b(value)
set_open_drain_c(value)
set_open_drain_d(value)
set_open_drain_e(value)
set_open_drain_f(value)
set_open_drain_g(value)
set_open_drain_h(value)
set_open_drain_j(value)
set_open_drain_k(value)
Parameters:
value – is a bitmap corresponding to the pins of the port. Setting a bit causes the corresponding pin to act
as an open-drain output.
Returns:
Nothing
Function
Enables/Disables open-drain output capability on port pins. Not all ports or port pins have open-drain
capability, refer to devices datasheet for port and pin availability.
On device that have open-drain capability.
set_open_drain_b(0x0001); //enables open-drain output on
PIN_B0, disable on all //other port B pins.
None.
Availability
Examples:
Example
Files:
//sets the new increment value
setup_nco( ), get_nco_accumulator( ), get_nco_inc_value( )
set_power_pwm_override( )
Syntax:
set_power_pwm_override(pwm, override, value)
Parameters:
pwm is a constant between 0 and 7
Override is true or false
Value is 0 or 1
Returns:
undefined
Function:
pwm selects which module will be affected.
Override determines whether the output is to be determined by the OVDCONS register or the PDC
registers. When override is false, the PDC registers determine the output.
When override is true, the output is determined by the value stored in OVDCONS.
Availability:
value determines if pin is driven to it's active staet or if pin will be inactive. I will be driven to its active state,
0 pin will be inactive.
All devices equipped with PWM.
Requires:
None
Examples:
set_power_pwm_override(1, true, 1);
//PWM1 will be
//overridden to active
//state
set_power_pwm_override(1, false, 0); //PMW1 will not be
//overidden
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CCSC_March 2015-1
Example
Files:
Also See:
None
setup_power_pwm(), setup_power_pwm_pins(), set_power_pwmX_duty()
set_power_pwmx_duty( )
Syntax:
set_power_pwmX_duty(duty)
Parameters:
X is 0, 2, 4, or 6
Duty is an integer between 0 and 16383.
Returns:
undefined
Function:
Stores the value of duty into the appropriate PDCXL/H register. This duty value is the amount of time that
the PWM output is in the active state.
Availability:
All devices equipped with PWM.
Requires:
None
Examples:
set_power_pwmx_duty(4000);
Example
Files:
Also See:
None
setup_power_pwm(), setup_power_pwm_pins(),
set_power_pwm_override()
set_pullup( )
Syntax:
set_Pullup(state, [ pin])
Parameters:
Pins are defined in the devices .h file. The actual number is a bit address. For example, port a (byte 5 ) bit 3
would have a value of 5*8+3 or 43. This is defined as follows: #DEFINE PIN_A3 43 . The pin could also be
a variable that has a value equal to one of the predefined pin constants. Note if no pin is provided in the
function call, then all of the pins are set to the passed in state.
State is either true or false.
Returns:
undefined
Function:
Sets the pin's pull up state to the passed in state value. If no pin is included in the function call, then all
valid pins are set to the passed in state.
Availability:
All devices.
Requires:
Pin constants are defined in the devices .h file.
Examples:
set_pullup(true, PIN_B0);
//Sets pin B0's pull up state to true
214
Built-in Functions
set_pullup(false);
//Sets all pin's pull up state to false
Example
Files:
Also See:
None
None
set_pwm1_duty( ) set_pwm2_duty( ) set_pwm3_duty( )
set_pwm4_duty( ) set_pwm5_duty( )
Syntax:
set_pwm1_duty (value)
set_pwm2_duty (value)
set_pwm3_duty (value)
set_pwm4_duty (value)
set_pwm5_duty (value)
Parameters:
value may be an 8 or 16 bit constant or variable.
Returns:
undefined
Function:
Writes the 10-bit value to the PWM to set the duty. An 8-bit value may be used if the most significant bits
are not required. The 10 bit value is then used to determine the duty cycle of the PWM signal as follows:
 duty cycle = value / [ 4 * (PR2 +1 ) ]
If an 8-bit value is used, the duty cycle of the PWM signal is determined as follows:
 duty cycle=value/(PR2+1)
Where PR2 is the maximum value timer 2 will count to before toggling the output pin.
Availability:
This function is only available on devices with CCP/PWM hardware.
Requires:
None
Examples:
// For a 20 mhz clock, 1.2 khz frequency,
// t2DIV set to 16, PR2 set to 200
// the following sets the duty to 50% (or 416 us).
long duty;
duty = 408; // [408/(4*(200+1))]=0.5=50%
set_pwm1_duty(duty);
Example
Files:
Also See:
ex_pwm.c
setup_ccpX(), set_ccpX_compare_time(), set_timer_period_ccpX(), set_timer_ccpX(), get_timer_ccpX(),
get_capture_ccpX(), get_captures32_ccpX()
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CCSC_March 2015-1
set_rtcc( ) set_timer0( ) set_timer1( ) set_timer2( )
set_timer3( ) set_timer4( ) set_timer5( )
Syntax:
set_timer0(value)
set_timer1(value)
set_timer2(value)
set_timer3(value)
set_timer4(value)
set_timer5(value)
or set_rtcc (value)
Parameters:
Timers 1 & 5 get a 16 bit int.
Timer 2 and 4 gets an 8 bit int.
Timer 0 (AKA RTCC) gets an 8 bit int except on the PIC18XXX where it needs a 16 bit int.
Timer 3 is 8 bit on PIC16 and 16 bit on PIC18
Returns:
undefined
Function:
Sets the count value of a real time clock/counter. RTCC and Timer0 are the same. All timers count up.
When a timer reaches the maximum value it will flip over to 0 and continue counting (254, 255, 0, 1, 2...)
Availability:
Timer 0 - All devices
Timers 1 & 2 - Most but not all PCM devices
Timer 3 - Only PIC18XXX and some pick devices
Timer 4 - Some PCH devices
Timer 5 - Only PIC18XX31
Requires:
Nothing
Examples:
// 20 mhz clock, no prescaler, set timer 0
// to overflow in 35us
set_timer0(81);
Example
Files:
Also See:
// 256-(.000035/(4/20000000))
ex_patg.c
set_timer1(), get_timerX() Timer0 Overview, Timer1Overview, Timer2 Overview, Timer5 Overview
set_ticks( )
Syntax:
Parameters:
set_ticks([stream],value);
stream – optional parameter specifying the stream defined in #USE TIMER
value – a 8, 16 or 32 bit integer, specifying the new value of the tick timer. (int8, int16 or int32)
Returns:
void
Function:
Sets the new value of the tick timer. Size passed depends on the size of the tick timer.
Availability:
All devices.
Requires:
#USE TIMER(options)
Examples:
#USE TIMER(TIMER=1,TICK=1ms,BITS=16,NOISR)
void main(void) {
unsigned int16 value = 0x1000;
216
Built-in Functions
set_ticks(value);
}
Example
Files:
Also See:
None
#USE TIMER, get_ticks()
setup_sd_adc_calibration( )
Syntax:
setup_sd_adc_calibration(model);
Parameters:
mode- selects whether to enable or disable calibration mode for the SD ADC module. The following
defines are made in the device's .h file:
1 SDADC_START_CALIBRATION_MODE
2 SDADC_END_CALIBRATION_MODE
Returns:
Nothing
Function:
Availability:
To enable or disable calibration mode on the Sigma-Delta Analog to Digital Converter (SD
ADC) module. This can be used to determine the offset error of the module, which then can
be subtracted from future readings.
Only devices with a SD ADC module.
Examples:
signed int 32 result, calibration;
set_sd_adc_calibration(SDADC_START_CALIBRATION_MODE);
calibration = read_sd_adc();
set_sd_adc_calibration(SDADC_END_CALIBRATION_MODE);
result = read_sd_adc() - calibration;
Example
Files:
Also See:
None
setup_sd_adc(), read_sd_adc(), set_sd_adc_channel()
set_sd_adc_channel( )
Syntax:
setup_sd_adc(channel);
Parameters:
channel- sets the SD ADC channel to read. Channel can be 0 to read the difference between CH0+ and
CH0-, 1 to read the difference between CH1+ and CH1-, or one of the following:
1 SDADC_CH1SE_SVSS
2 SDADC_REFERENCE
Returns:
Nothing
Function:
To select the channel that the Sigma-Delta Analog to Digital Converter (SD ADC) performs the conversion
on.
Availability:
Only devices with a SD ADC module.
217
CCSC_March 2015-1
Examples:
set_sd_adc_channel(0);
Example
Files:
Also See:
None
setup_sd_adc(), read_sd_adc(), set_sd_adc_calibration()
set_timerA( )
Syntax:
set_timerA(value);
Parameters:
An 8 bit integer. Specifying the new value of the timer. (int8)
Returns:
undefined
Function:
Sets the current value of the timer. All timers count up. When a timer reaches the maximum value it will flip
over to 0 and continue counting (254, 255, 0, 1, 2, …).
Availability:
This function is only available on devices with Timer A hardware.
Requires:
Nothing
Examples:
// 20 mhz clock, no prescaler, set timer A
// to overflow in 35us
set_timerA(81); // 256-(.000035/(4/20000000))
Example
Files:
Also See:
none
get_timerA( ), setup_timer_A( ), TimerA Overview
set_timerB( )
Syntax:
set_timerB(value);
Parameters:
An 8 bit integer. Specifying the new value of the timer. (int8)
Returns:
undefined
Function:
Sets the current value of the timer. All timers count up. When a timer reaches the maximum value it will flip
over to 0 and continue counting (254, 255, 0, 1, 2, …).
Availability:
This function is only available on devices with Timer B hardware.
Requires:
Nothing
Examples:
// 20 mhz clock, no prescaler, set timer B
// to overflow in 35us
set_timerB(81); // 256-(.000035/(4/20000000))
Example
Files:
218
none
Built-in Functions
Also See:
get_timerB( ), setup_timer_B( ), TimerB Overview
set_timerx( )
Syntax:
set_timerX(value)
Parameters:
Returns:
A 16 bit integer, specifiying the new value of the timer. (int16)
void
Function:
Availability:
Requires:
Allows the user to set the value of the timer.
This function is available on all devices that have a valid timerX.
Nothing
Examples:
if(EventOccured())
set_timer2(0);//reset the timer.
Example
Files:
Also See:
None
Timer Overview, set_timerX()
set_rtcc( ) set_timer0( ) set_timer1( ) set_timer2( )
set_timer3( ) set_timer4( ) set_timer5( )
Syntax:
set_timer0(value)
set_timer1(value)
set_timer2(value)
set_timer3(value)
set_timer4(value)
set_timer5(value)
or set_rtcc (value)
Parameters:
Timers 1 & 5 get a 16 bit int.
Timer 2 and 4 gets an 8 bit int.
Timer 0 (AKA RTCC) gets an 8 bit int except on the PIC18XXX where it needs a 16 bit int.
Timer 3 is 8 bit on PIC16 and 16 bit on PIC18
Returns:
undefined
Function:
Sets the count value of a real time clock/counter. RTCC and Timer0 are the same. All timers count up.
When a timer reaches the maximum value it will flip over to 0 and continue counting (254, 255, 0, 1, 2...)
Availability:
Timer 0 - All devices
Timers 1 & 2 - Most but not all PCM devices
Timer 3 - Only PIC18XXX and some pick devices
Timer 4 - Some PCH devices
Timer 5 - Only PIC18XX31
Requires:
Nothing
Examples:
// 20 mhz clock, no prescaler, set timer 0
// to overflow in 35us
219
CCSC_March 2015-1
set_timer0(81);
Example
Files:
Also See:
// 256-(.000035/(4/20000000))
ex_patg.c
set_timer1(), get_timerX() Timer0 Overview, Timer1Overview, Timer2 Overview, Timer5 Overview
set_tris_x( )
Syntax:
set_tris_a (value)
set_tris_b (value)
set_tris_c (value)
set_tris_d (value)
set_tris_e (value)
set_tris_f (value)
set_tris_g (value)
set_tris_h (value)
set_tris_j (value)
set_tris_k (value)
Parameters:
value is an 8 bit int with each bit representing a bit of the I/O port.
Returns:
undefined
Function:
These functions allow the I/O port direction (TRI-State) registers to be set. This must be used with FAST_IO
and when I/O ports are accessed as memory such as when a # BYTE directive is used to access an I/O
port. Using the default standard I/O the built in functions set the I/O direction automatically.
Each bit in the value represents one pin. A 1 indicates the pin is input and a 0 indicates it is output.
Availability:
All devices (however not all devices have all I/O ports)
Requires:
Nothing
Examples:
SET_TRIS_B( 0x0F );
// B7,B6,B5,B4 are outputs
// B3,B2,B1,B0 are inputs
Example
Files:
Also See:
lcd.c
#USE FAST_IO, #USE FIXED_IO, #USE STANDARD_IO, General Purpose I/O
set_uart_speed( )
Syntax:
set_uart_speed (baud, [stream, clock])
Parameters:
baud is a constant representing the number of bits per second.
stream is an optional stream identifier.
clock is an optional parameter to indicate what the current clock is if it is different from the #use delay
value
Returns:
undefined
Function:
Changes the baud rate of the built-in hardware RS232 serial port at run-time.
220
Built-in Functions
Availability:
This function is only available on devices with a built in UART.
Requires:
#USE RS232
Examples:
// Set baud rate based on setting
// of pins B0 and B1
switch(
case
case
case
case
}
Example
Files:
Also See:
input_b() & 3 ) {
0 : set_uart_speed(2400);
1 : set_uart_speed(4800);
2 : set_uart_speed(9600);
3 : set_uart_speed(19200);
break;
break;
break;
break;
loader.c
#USE RS232, putc(), getc(), setup uart(), RS232 I/O Overview,
setjmp( )
Syntax:
result = setjmp (env)
Parameters:
env: The data object that will receive the current environment
Returns:
If the return is from a direct invocation, this function returns 0.
If the return is from a call to the longjmp function, the setjmp function returns a nonzero value and it's the
same value passed to the longjmp function.
Function:
Stores information on the current calling context in a data object of type jmp_buf and which marks where
you want control to pass on a corresponding longjmp call.
Availability:
All devices
Requires:
#INCLUDE <setjmp.h>
Examples:
result = setjmp(jmpbuf);
Example
Files:
Also See:
None
longjmp()
setup_adc(mode)
Syntax:
Parameters:
Returns:
setup_adc (mode);
setup_adc2(mode);
mode- Analog to digital mode. The valid options vary depending on the device. See the devices .h file for all
options. Some typical options include:
 ADC_OFF
 ADC_CLOCK_INTERNAL
 ADC_CLOCK_DIV_32
undefined
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CCSC_March 2015-1
Function:
Configures the analog to digital converter.
Availability:
Only the devices with built in analog to digital converter.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_adc_ports( ALL_ANALOG );
setup_adc(ADC_CLOCK_INTERNAL );
set_adc_channel( 0 );
value = read_adc();
setup_adc( ADC_OFF );
Example
Files:
Also See:
ex_admm.c
setup_adc_ports(), set_adc_channel(), read_adc(), #DEVICE, ADC Overview,
see header file for device selected
setup_adc_ports( )
Syntax:
setup_adc_ports (value)
setup_adc_ports (ports, [reference])
Parameters:
value - a constant defined in the devices .h file
ports - is a constant specifying the ADC pins to use
reference - is an optional constant specifying the ADC reference to use
By default, the reference voltage are Vss and Vdd
Returns:
undefined
Function:
Sets up the ADC pins to be analog, digital, or a combination and the voltage reference to use when
computing the ADC value. The allowed analog pin combinations vary depending on the chip and are defined
by using the bitwise OR to concatenate selected pins together. Check the device include file for a complete
list of available pins and reference voltage settings. The constants ALL_ANALOG and NO_ANALOGS are
valid for all chips. Some other example pin definitions are:
Also See:
setup_adc(), read_adc(), set_adc_channel(), ADC Overview
setup_ccp1( ) setup_ccp2( ) setup_ccp3( ) setup_ccp4( )
setup_ccp5( ) setup_ccp6( )
Syntax:
Parameters:
setup_ccp1 (mode) or setup_ccp1 (mode, pwm)
setup_ccp2 (mode) or setup_ccp2 (mode, pwm)
setup_ccp3 (mode) or setup_ccp3 (mode, pwm)
setup_ccp5 (mode) or setup_ccp5 (mode, pwm)
setup_ccp6 (mode) or setup_ccp6 (mode, pwm)
mode is a constant. Valid constants are defined in the devices .h file and refer to devices .h file for all
options, some options are as follows:
Disable the CCP:
CCP_OFF
222
Built-in Functions
Set CCP to capture mode:
CCP_CAPTURE_FE
CCP_CAPTURE_RE
CCP_CAPTURE_DIV_4
CCP_CAPTURE_DIV_16
Capture on falling edge
Capture on rising edge
Capture after 4 pulses
Capture after 16 pulses
Set CCP to compare mode:
CCP_COMPARE_SET_ON_MATCH
CCP_COMPARE_CLR_ON_MATCH
CCP_COMPARE_INT
CCP_COMPARE_RESET_TIMER
Output high on compare
Output low on compare
interrupt on compare
Reset timer on compare
Set CCP to PWM mode:
CCP_PWM
Enable Pulse Width Modulator
Constants used for ECCP modules are as follows:
CCP_PWM_H_H
CCP_PWM_H_L
CCP_PWM_L_H
CCP_PWM_L_L
CCP_PWM_FULL_BRIDGE
CCP_PWM_FULL_BRIDGE_REV
CCP_PWM_HALF_BRIDGE
CCP_SHUTDOWN_ON_COMP1
CCP_SHUTDOWN_ON_COMP2
CCP_SHUTDOWN_ON_COMP
CCP_SHUTDOWN_ON_INT0
CCP_SHUTDOWN_ON_COMP1_INT0
CCP_SHUTDOWN_ON_COMP2_INT0
CCP_SHUTDOWN_ON_COMP_INT0
shutdown on Comparator 1 change
shutdown on Comparator 2 change
Either Comp. 1 or 2 change
VIL on INT pin
VIL on INT pin or Comparator 1 change
VIL on INT pin or Comparator 2 change
VIL on INT pin or Comparator 1 or 2 change
CCP_SHUTDOWN_AC_L
CCP_SHUTDOWN_AC_H
CCP_SHUTDOWN_AC_F
Drive pins A and C high
Drive pins A and C low
Drive pins A and C tri-state
CCP_SHUTDOWN_BD_L
CCP_SHUTDOWN_BD_H
CCP_SHUTDOWN_BD_F
Drive pins B and D high
Drive pins B and D low
Drive pins B and D tri-state
CCP_SHUTDOWN_RESTART
CCP_DELAY
the device restart after a shutdown event
use the dead-band delay
pwm parameter is an optional parameter for chips that includes ECCP module. This parameter allows
setting the shutdown time. The value may be 0-255.
Returns:
Undefined
Function:
Initialize the CCP. The CCP counters may be accessed using the long variables CCP_1 and CCP_2. The
CCP operates in 3 modes. In capture mode it will copy the timer 1 count value to CCP_x when the input pin
event occurs. In compare mode it will trigger an action when timer 1 and CCP_x are equal. In PWM mode it
will generate a square wave. The PCW wizard will help to set the correct mode and timer settings for a
particular application.
Availability:
This function is only available on devices with CCP hardware.
223
CCSC_March 2015-1
Requires:
Constants are defined in the devices .h file.
Examples:
setup_ccp1(CCP_CAPTURE_RE);
Example
Files:
Also See:
ex_pwm.c, ex_ccpmp.c, ex_ccp1s.c
set_pwmX_duty(), set_ccpX_compare_time(), set_timer_period_ccpX(), set_timer_ccpX(),
get_timer_ccpX(), get_capture_ccpX(), get_captures32_ccpX()
setup_clc1() setup_clc2() setup_clc3() setup_clc4()
Syntax:
setup_clc1(mode);
setup_clc2(mode);
setup_clc3(mode);
setup_clc4(mode);
Parameters:
mode – The mode to setup the Configurable Logic Cell (CLC) module into. See the device's
.h file for all options. Some typical options include:
CLC_ENABLED
CLC_OUTPUT
CLC_MODE_AND_OR
CLC_MODE_OR_XOR
Returns:
Undefined.
Function:
Sets up the CLC module to performed the specified logic. Please refer to the device
datasheet to determine what each input to the CLC module does for the select logic function
Availability:
On devices with a CLC module.
R
e
t
u
r
n
s
:
Examples:
Undefined.
Example
Files:
Also See:
None
setup_clc1(CLC_ENABLED | CLC_MODE_AND_OR);
clcx_setup_gate(), clcx_setup_input()
setup_comparator( )
Syntax:
setup_comparator (mode)
Parameters:
mode is a constant. Valid constants are in the devices .h file refer to devices .h file for valid options.
Some typical options are as follows:
224
Built-in Functions
A0_A3_A1_A2
A0_A2_A1_A2
NC_NC_A1_A2
NC_NC_NC_NC
A0_VR_A1_VR
A3_VR_A2_VR
A0_A2_A1_A2_OUT_ON_A3_A4
A3_A2_A1_A2
Returns:
undefined
Function:
Sets the analog comparator module. The above constants have four parts representing the inputs: C1-,
C1+, C2-, C2+
Availability:
This function is only available on devices with an analog comparator.
Requires
Constants are defined in the devices .h file.
Examples:
// Sets up two independent comparators (C1 and C2),
// C1 uses A0 and A3 as inputs (- and +), and C2
// uses A1 and A2 as inputs
setup_comparator(A0_A3_A1_A2);
Example
Files:
ex_comp.c
Also See:
Analog Comparator overview
setup_counters( )
Syntax:
setup_counters (rtcc_state, ps_state)
Parameters:
rtcc_state may be one of the constants defined in the devices .h file. For example: RTCC_INTERNAL,
RTCC_EXT_L_TO_H or RTCC_EXT_H_TO_L
ps_state may be one of the constants defined in the devices .h file.
For example: RTCC_DIV_2, RTCC_DIV_4, RTCC_DIV_8, RTCC_DIV_16, RTCC_DIV_32,
RTCC_DIV_64, RTCC_DIV_128, RTCC_DIV_256, WDT_18MS, WDT_36MS, WDT_72MS,
WDT_144MS, WDT_288MS, WDT_576MS, WDT_1152MS, WDT_2304MS
Returns:
undefined
Function:
Sets up the RTCC or WDT. The rtcc_state determines what drives the RTCC. The PS state sets a
prescaler for either the RTCC or WDT. The prescaler will lengthen the cycle of the indicated counter. If
the RTCC prescaler is set the WDT will be set to WDT_18MS. If the WDT prescaler is set the RTCC is
set to RTCC_DIV_1.
This function is provided for compatibility with older versions. setup_timer_0 and setup_WDT are the
recommended replacements when possible. For PCB devices if an external RTCC clock is used and a
WDT prescaler is used then this function must be used.
Availability:
All devices
Requires:
Constants are defined in the devices .h file.
Examples:
setup_counters (RTCC_INTERNAL, WDT_2304MS);
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CCSC_March 2015-1
Example
Files:
Also See:
None
setup wdt(), setup_timer 0(), see header file for device selected
setup_cog( )
Syntax:
setup_cog(mode, [shutdown]);
setup_cog(mode, [shutdown], [sterring]);
Parameters:
mode- the setup of the COG module. See the device's .h file for all options.
Some typical options include:




COG_ENABLED
COG_DISABLED
COG_CLOCK_HFINTOSC
COG_CLOCK_FOSC
shutdown- the setup for the auto-shutdown feature of COG module.
See the device's .h file for all the options. Some typical options include:



COG_AUTO_RESTART
COG_SHUTDOWN_ON_C1OUT
COG_SHUTDOWN_ON_C2OUT
steering- optional parameter for steering the PWM signal to COG output pins and/or selecting
the COG pins static level. Used when COG is set for steered PWM or synchronous steered
PWM modes. Not available on all devices, see the device's .h file if available and for all options.
Some typical options include:

COG_PULSE_STEERING_A

COG_PULSE_STEERING_B

COG_PULSE_STEERING_C

COG_PULSE_STEERING_D
Returns:
undefined
Function:
Sets up the Complementary Output Generator (COG) module, the auto-shutdown feature of
the module and if available steers the signal to the different output pins.
Availability:
All devices with a COG module.
Examples:
setup_cog(COG_ENABLED | COG_PWM | COG_FALLING_SOURCE_PWM3 |
COG_RISING_SOURCE_PWM3, COG_NO_AUTO_SHUTDOWN,
COG_PULSE_STEERING_A | COG_PULSE_STEERING_B);
Example
Files:
Also See:
None
226
set_cog_dead_band(), set_cog_phase(), set_cog_blanking(), cog_status(), cog_restart()
Built-in Functions
setup_crc( )
Syntax:
setup_crc(polynomial terms)
Parameters:
polynomial- This will setup the actual polynomial in the CRC engine. The power of each
term is passed separated by a comma. 0 is allowed, but ignored. The following define
is added to the device's header file to enable little-endian shift direction:
CRC_LITTLE_ENDIAN
Returns:
Nothing
Function:
Availability:
Examples:
Configures the CRC engine register with the polynomial.
Only devices with a built-in CRC module.
setup_crc(12, 5);
setup_crc(16, 15, 3, 1);
Example
Files:
Also See:
// CRC Polynomial is x12+x5+1
// CRC Polynomial is x16+x15+x3+x1+1
None
crc_init(), crc_calc(), crc_calc8()
setup_cwg( )
Syntax:
setup_cwg(mode,shutdown,dead_time_rising,dead_time_falling)
Parameters:
mode- the setup of the CWG module. See the device's .h file for all options.
Some typical options include:




CWG_ENABLED
CWG_DISABLED
CWG_OUTPUT_B
CWG_OUTPUT_A
shutdown- the setup for the auto-shutdown feature of CWG module.
See the device's .h file for all the options. Some typical options include:
CWG_AUTO_RESTART
CWG_SHUTDOWN_ON)COMP1
CWG_SHUTDOWN_ON_FLT
CWG_SHUTDOWN_ON_CLC2
dead_time_rising- value specifying the dead time between A and B on the
rising edge. (0-63)
dead_time_rising- value specifying the dead time between A and B on the
falling edge. (0-63)
Returns:
undefined
Function:
Sets up the CWG module, the auto-shutdown feature of module and the rising
and falling dead times of the module.
227
CCSC_March 2015-1
Availability:
All devices with a CWG module.
Examples:
setup_cwg(CWG_ENABLED|CWG_OUTPUT_A|CWG_OUTPUT_B|
CWG_INPUT_PWM1,CWG_SHUTDOWN_ON_FLT,60,30);
Example
Files:
Also See:
None
cwg_status( ), cwg_restart( )
setup_dac( )
Syntax:
setup_dac(mode);
Parameters:
mode- The valid options vary depending on the device. See the devices .h file for all options. Some
typical options include:
· DAC_OUTPUT
Returns:
undefined
Function:
Configures the DAC including reference voltage.
Availability:
Only the devices with built in digital to analog converter.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_dac(DAC_VDD | DAC_OUTPUT);
dac_write(value);
Example
Files:
None
Also See:
dac_write( ), DAC Overview, See header file for device selected
setup_external_memory( )
Syntax:
SETUP_EXTERNAL_MEMORY( mode );
Parameters:
mode is one or more constants from the device header file OR'ed together.
Returns:
undefined
Function:
Sets the mode of the external memory bus.
Availability:
Only devices that allow external memory.
228
Built-in Functions
Requires:
Constants are defined in the device.h file
Examples:
setup_external_memory(EXTMEM_WORD_WRITE
|EXTMEM_WAIT_0 );
setup_external_memory(EXTMEM_DISABLE);
Example
Files:
Also See:
None
WRITE PROGRAM EEPROM() , WRITE PROGRAM MEMORY(), External Memory Overview
setup_high_speed_adc( )
Syntax:
setup_high_speed_adc (mode);
Parameters:
mode – Analog to digital mode. The valid options vary depending on the device. See the devices .h file
for all options. Some typical options include:
· ADC_OFF
· ADC_CLOCK_DIV_1
· ADC_HALT_IDLE – The ADC will not run when PIC is idle.
Returns:
Undefined
Function:
Configures the High-Speed ADC clock speed and other High-Speed ADC options including, when the
ADC interrupts occurs, the output result format, the conversion order, whether the ADC pair is sampled
sequentially or simultaneously, and whether the dedicated sample and hold is continuously sampled or
samples when a trigger event occurs.
Availability:
Only on dsPIC33FJxxGSxxx devices.
Requires:
Constants are define in the device .h file.
Examples:
setup_high_speed_adc_pair(0, INDIVIDUAL_SOFTWARE_TRIGGER);
setup_high_speed_adc(ADC_CLOCK_DIV_4);
read_high_speed_adc(0, START_AND_READ, result);
setup_high_speed_adc(ADC_OFF);
Example
Files:
Also See:
None
setup_high_speed_adc_pair(), read_high_speed_adc(), high_speed_adc_done()
setup_high_speed_adc_pair( )
Syntax:
setup_high_speed_adc_pair(pair, mode);
Parameters:
pair – The High-Speed ADC pair number to setup, valid values are 0 to total number of ADC pairs. 0
sets up ADC pair AN0 and AN1, 1 sets up ADC pair AN2 and AN3, etc.
mode – ADC pair mode. The valid options vary depending on the device. See the devices .h file for all
options. Some typical options include:
· INDIVIDUAL_SOFTWARE_TRIGGER
· GLOBAL_SOFTWARE_TRIGGER
229
CCSC_March 2015-1
· PWM_PRIMARY_SE_TRIGGER
· PWM_GEN1_PRIMARY_TRIGGER
· PWM_GEN2_PRIMARY_TRIGGER
Returns:
Undefined
Function:
Sets up the analog pins and trigger source for the specified ADC pair. Also sets up whether ADC
conversion for the specified pair triggers the common ADC interrupt.
If zero is passed for the second parameter the corresponding analog pins will be set to digital pins.
Availability:
Requires:
Only on dsPIC33FJxxGSxxx devices.
Constants are define in the device .h file.
Examples:
setup_high_speed_adc_pair(0, INDIVIDUAL_SOFTWARE_TRIGGER);
setup_high_speed_adc_pair(1, GLOBAL_SOFTWARE_TRIGGER);
setup_high_speed_adc_pair(2, 0) – sets AN4 and AN5 as digital pins.
Example
Files:
Also See:
None
setup_high_speed_adc(), read_high_speed_adc(), high_speed_adc_done()
setup_lcd( )
Syntax:
setup_lcd (mode, prescale, [segments0_31],[segments32_47]);
Parameters:
Mode may be any of the following constants to enable the LCD and may be or'ed with other constants in
the devices *.h file:

LCD_DISABLED, LCD_STATIC, LCD_MUX12, LCD_MUX13, LCD_MUX14
See the devices .h file for other device specific options.
Prescale may be 1-16 for the LCD clock.
Segments0-31 may be any of the following constants or'ed together when using the PIC16C92X series of
chips::

SEG0_4, SEG5_8, SEG9_11, SEG12_15, SEG16_19, SEG20_26, SEG27_28,
SEG29_31 ALL_LCD_PINS
When using the PIC16F/LF1xxx or PIC18F/LFxxxx series of chips, each of the segments are enabled
individually. A value of 1 will enable the segment, 0 will disable it and use the pin for normal I/O operation.
Segments 32-47 when using a chip with more than 32 segments, this enables segments 32-47. A value
1 will enable the segment, 0 will disable it. Bit 0 corresponds to segment 32 and bit 15 corresponds to
segment 47.
Returns:
undefined.
Function:
This function is used to initialize the LCD Driver Module on the PIC16C92X and PIC16F/LF193X series of
chips.
Availability:
Only on devices with built-in LCD Driver Module hardware.
230
Built-in Functions
Requires
Constants are defined in the devices *.h file.
Examples:
· setup_lcd( LCD_MUX14 | LCD_STOP_ON_SLEEP, 2, ALL_LCD_PINS );
// PIC16C92X
· setup_lcd( LCD_MUX13 | LCD_REF_ENABLED | LCD_B_HIGH_POWER, 0, 0xFF0429);
// PIC16F/LF193X – Enables Segments 0, 3, 5, 10, 16, 17, 18, 19, 20, 21, 22,
23
Example
Files:
Also See:
ex_92lcd.c
lcd_symbol(), lcd_load(), lcd_contrast( ), Internal LCD Overview
setup_low_volt_detect( )
Syntax:
setup_low_volt_detect(mode)
Parameters:
mode may be one of the constants defined in the devices .h file. LVD_LVDIN, LVD_45, LVD_42,
LVD_40, LVD_38, LVD_36, LVD_35, LVD_33, LVD_30, LVD_28, LVD_27, LVD_25, LVD_23, LVD_21,
LVD_19
One of the following may be or’ed(via |) with the above if high voltage detect is also available in the device
LVD_TRIGGER_BELOW, LVD_TRIGGER_ABOVE
Returns:
undefined
Function:
This function controls the high/low voltage detect module in the device. The mode constants specifies the
voltage trip point and a direction of change from that point (available only if high voltage detect module is
included in the device). If the device experiences a change past the trip point in the specified direction the
interrupt flag is set and if the interrupt is enabled the execution branches to the interrupt service routine.
Availability:
This function is only available with devices that have the high/low voltage detect module.
Requires
Constants are defined in the devices.h file.
Examples:
setup_low_volt_detect( LVD_TRIGGER_BELOW | LVD_36 );
This would trigger the interrupt when the voltage is below 3.6 volts
setup_nco( )
Syntax:
setup_nco(settings,inc_value)
Parameters:
settings- setup of the NCO module. See the device's .h file for all options.
Some typical options include:
·
·
·
·
NCO_ENABLE
NCO_OUTPUT
NCO_PULSE_FREQ_MODE
NCO_FIXED_DUTY_MODE
inc_value- int16 value to increment the NCO 20 bit accumulator by.
Returns:
Undefined
231
CCSC_March 2015-1
Function:
Sets up the NCO module and sets the value to increment the 20-bit accumulator by.
Availability:
On devices with a NCO module.
Examples:
setup_nco(NCO_ENABLED|NCO_OUTPUT|NCO_FIXED_DUTY_MODE|
NCO_CLOCK_FOSC,8192);
Example
Files:
Also See:
None
get_nco_accumulator( ), set_nco_inc_value( ), get_nco_inc_value( )
setup_opamp1( ) setup_opamp2( )
Syntax:
setup_opamp1(enabled)
setup_opamp2(enabled)
Parameters:
enabled can be either TRUE or FALSE.
Returns:
undefined
Function:
Enables or Disables the internal operational amplifier peripheral of certain PICmicros.
Availability:
Only parts with a built-in operational amplifier (for example, PIC16F785).
Requires:
Only parts with a built-in operational amplifier (for example, PIC16F785).
Examples:
setup_opamp1(TRUE);
setup_opamp2(boolean_flag);
Example
Files:
Also See:
None
None
setup_oscillator( )
Syntax:
setup_oscillator(mode, finetune)
Parameters:
mode is dependent on the chip. For example, some chips allow speed setting such as OSC_8MHZ or
OSC_32KHZ. Other chips permit changing the source like OSC_TIMER1.
The finetune (only allowed on certain parts) is a signed int with a range of -31 to +31.
Returns:
Some chips return a state such as OSC_STATE_STABLE to indicate the oscillator is stable .
Function:
This function controls and returns the state of the internal RC oscillator on some parts. See the devices .h
file for valid options for a particular device.
Note that if INTRC or INTRC_IO is specified in #fuses and a #USE DELAY is used for a valid speed
option, then the compiler will do this setup automatically at the start of main().
232
Built-in Functions
WARNING: If the speed is changed at run time the compiler may not generate the correct delays for
some built in functions. The last #USE DELAY encountered in the file is always assumed to be the correct
speed. You can have multiple #USE DELAY lines to control the compilers knowledge about the speed.
Availability:
Only parts with a OSCCON register.
Requires:
Constants are defined in the .h file.
Examples:
setup_oscillator( OSC_2MHZ );
Example
Files:
Also See:
None
#FUSES, Internal oscillator Overview
setup_pmp(option,address_mask)
Syntax:
setup_pmp(options,address_mask);
Parameters:
options- The mode of the Parallel Master Port that allows to set the Master Port mode, read-write strobe
options and other functionality of the PMPort module. See the device's .h file for all options. Some typical
options include:
·
·
·
·
PAR_PSP_AUTO_INC
PAR_CONTINUE_IN_IDLE
PAR_INTR_ON_RW
PAR_INC_ADDR
· PAR_MASTER_MODE_1
· PAR_WAITE4
//Interrupt on read write
//Increment address by 1 every
//read/write cycle
//Master Mode 1
//4 Tcy Wait for data hold after
// strobe
address_mask- this allows the user to setup the address enable register with a 16-bit value. This value
determines which address lines are active from the available 16 address lines PMA0:PMA15.
Returns:
Undefined.
Function:
Configures various options in the PMP module. The options are present in the device's .h file and they are
used to setup the module. The PMP module is highly configurable and this function allows users to setup
configurations like the Slave module, Interrupt options, address increment/decrement options, Address
enable bits, and various strobe and delay options.
Availability:
Only the devices with a built-in Parallel Master Port module.
Requires:
Constants are defined in the device's .h file.
Examples:
setup_psp(PAR_ENABLE|
PAR_MASTER_MODE_1|PAR_
STOP_IN_IDLE,0x00FF);
Example
Files:
Also See:
None
//Sets up Master mode with address
//lines PMA0:PMA7
setup_pmp( ), pmp_address( ), pmp_read( ), psp_read( ), psp_write( ), pmp_write( ), psp_output_full( ),
psp_input_full( ), psp_overflow( ), pmp_output_full( ), pmp_input_full( ), pmp_overflow( )
See header file for device selected
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setup_power_pwm( )
Syntax:
setup_power_pwm(modes, postscale, time_base, period, compare, compare_postscale,
dead_time)
Parameters:
modes values may be up to one from each group of the following:
PWM_CLOCK_DIV_4, PWM_CLOCK_DIV_16,
PWM_CLOCK_DIV_64, PWM_CLOCK_DIV_128
PWM_DISABLED, PWM_FREE_RUN, PWM_SINGLE_SHOT,
PWM_UP_DOWN, PWM_UP_DOWN_INT
PWM_OVERRIDE_SYNC
PWM_UP_TRIGGER,
PWM_DOWN_TRIGGER
PWM_UPDATE_DISABLE, PWM_UPDATE_ENABLE
PWM_DEAD_CLOCK_DIV_2,
PWM_DEAD_CLOCK_DIV_4,
PWM_DEAD_CLOCK_DIV_8,
PWM_DEAD_CLOCK_DIV_16
postscale is an integer between 1 and 16. This value sets the PWM time base output postscale.
time_base is an integer between 0 and 65535. This is the initial value of the PWM base
period is an integer between 0 and 4095. The PWM time base is incremented until it reaches this
number.
compare is an integer between 0 and 255. This is the value that the PWM time base is compared to, to
determine if a special event should be triggered.
compare_postscale is an integer between 1 and 16. This postscaler affects compare, the special events
trigger.
dead_time is an integer between 0 and 63. This value specifies the length of an off period that should be
inserted between the going off of a pin and the going on of it is a complementary pin.
Returns:
undefined
Function:
Initializes and configures the motor control Pulse Width Modulation (PWM) module.
Availability:
All devices equipped with motor control or power PWM module.
Requires:
None
Examples:
setup_power_pwm(PWM_CLOCK_DIV_4 | PWM_FREE_RUN |
PWM_DEAD_CLOCK_DIV_4,1,10000,1000,0,1,0);
Example
Files:
Also See:
None
234
set_power_pwm_override(), setup_power_pwm_pins(), set_power_pwmX_duty()
Built-in Functions
setup_power_pwm_pins( )
Syntax:
setup_power_pwm_pins(module0,module1,module2,module3)
Parameters:
For each module (two pins) specify:
PWM_PINS_DISABLED, PWM_ODD_ON, PWM_BOTH_ON,
PWM_COMPLEMENTARY
Returns:
undefined
Function:
Configures the pins of the Pulse Width Modulation (PWM) device.
Availability:
All devices equipped with a power control PWM.
Requires:
None
Examples:
setup_power_pwm_pins(PWM_PINS_DISABLED, PWM_PINS_DISABLED, PWM_PINS_DISABLED,
PWM_PINS_DISABLED);
setup_power_pwm_pins(PWM_COMPLEMENTARY,
PWM_COMPLEMENTARY, PWM_PINS_DISABLED, PWM_PINS_DISABLED);
Example Files:
None
Also See:
setup_power_pwm(), set_power_pwm_override(),set_power_pwmX_duty()
setup_psp(option,address_mask)
Syntax:
setup_psp (options,address_mask);
setup_psp(options);
Parameters:
Option- The mode of the Parallel slave port. This allows to set the slave port mode, read-write strobe
options and other functionality of the PMP/EPMP module. See the devices .h file for all options. Some
typical options include:
·
·
·
·
PAR_PSP_AUTO_INC
PAR_CONTINUE_IN_IDLE
PAR_INTR_ON_RW
PAR_INC_ADDR
· PAR_WAITE4
//Interrupt on read write
//Increment address by 1 every
//read/write cycle
//4 Tcy Wait for data hold after
//strobe
address_mask- This allows the user to setup the address enable register with a 16 bit or 32 bit (EPMP)
value. This value determines which address lines are active from the available 16 address lines PMA0:
PMA15 or 32 address lines PMAO:PMA31 (EPMP only).
Returns:
Undefined.
Function:
Configures various options in the PMP/EPMP module. The options are present in the device.h file and
they are used to setup the module. The PMP/EPMP module is highly configurable and this function
allows users to setup configurations like the Slave mode, Interrupt options, address
increment/decrement options, Address enable bits and various strobe and delay options.
Availability:
Only the devices with a built in Parallel Port module or Enhanced Parallel Master Port module.
Requires:
Constants are defined in the devices .h file.
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Examples:
setup_psp(PAR_PSP_AUTO_INC|
PAR_STOP_IN_IDLE,0x00FF );
Example Files:
Also See:
//Sets
//mode
//read
//auto
up legacy slave
with
and write buffers
increment.
None
psp_output_full(), psp_input_full(), psp_overflow(),
See header file for device selected.
setup_pwm1( ) setup_pwm2( ) setup_pwm3( )
setup_pwm4( )
Syntax:
setup_pwm1(settings);
setup_pwm2(settings);
setup_pwm3(settings);
setup_pwm4(settings);
Parameters:
settings- setup of the PWM module. See the device's .h file for all options.
Some typical options include:
· PWM_ENABLED
· PWM_OUTPUT
· PWM_ACTIVE_LOW
Returns:
Undefined
Function:
Sets up the PWM module.
Availability:
On devices with a PWM module.
Examples:
setup_pwm1(PWM_ENABLED|PWM_OUTPUT);
Example Files:
None
Also See:
set_pwm_duty( )
setup_qei( )
Syntax:
setup_qei( options, filter, maxcount );
Parameters:
Options- The mode of the QEI module. See the devices .h file for all options
Some common options are:
· QEI_MODE_X2
· QEI_MODE_X4
filter - This parameter is optional, the user can enable the digital filters and specify the clock divisor.
maxcount - Specifies the value at which to reset the position counter.
236
Built-in Functions
Returns:
void
Function:
Configures the Quadrature Encoder Interface. Various settings
like mode and filters can be setup.
Availability:
Devices that have the QEI module.
Requires:
Nothing.
Examples:
setup_qei(QEI_MODE_X2|QEI_RESET_WHEN_MAXCOUNT,
QEI_FILTER_ENABLE_QEA|QEI_FILTER_DIV_2,0x1000);
Example Files:
None
Also See:
qei_set_count() , qei_get_count() , qei_status()
setup_rtc( )
Syntax:
setup_rtc() (options, calibration);
Parameters:
Options- The mode of the RTCC module. See the devices .h file for all options
Returns:
Calibration- This parameter is optional and the user can specify an 8 bit value that will get written to the
calibration configuration register.
void
Function:
Configures the Real Time Clock and Calendar module. The module requires an external 32.768 kHz
clock crystal for operation.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
Examples:
setup_rtc(RTC_ENABLE | RTC_OUTPUT SECONDS, 0x00);
// Enable RTCC module with seconds clock and no calibration
Example Files:
None
Also See:
rtc_read(), rtc_alarm_read(), rtc_alarm_write(), setup_rtc_alarm(),
rtc_write(, setup_rtc()
setup_rtc_alarm( )
Syntax:
setup_rtc_alarm(options, mask, repeat);
Parameters:
options- The mode of the RTCC module. See the devices .h file for all options
mask- specifies the alarm mask bits for the alarm configuration.
repeat- Specifies the number of times the alarm will repeat. It can have a max value of 255.
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Returns:
void
Function:
Configures the alarm of the RTCC module.
Availability:
Devices that have the RTCC module.
Requires:
Nothing.
Examples:
setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_HOUR, 3);
Example Files:
None
Also See:
rtc_read(), rtc_alarm_read(), rtc_alarm_write(), setup_rtc_alarm(), rtc_write(), setup_rtc()
setup_sd_adc( )
Syntax:
setup_sd_adc(settings1, settings 2, settings3);
Parameters:
settings1- settings for the SD1CON1 register of the SD ADC module. See the device's .h file for all
options. Some options include:
1 SDADC_ENABLED
2 SDADC_NO_HALT
3 SDADC_GAIN_1
4 SDADC_NO_DITHER
5 SDADC_SVDD_SVSS
6 SDADC_BW_NORMAL
settings2- settings for the SD1CON2 register of the SD ADC module. See the device's .h file for all
options. Some options include:
7 SDADC_CHOPPING_ENABLED
8 SDADC_INT_EVERY_SAMPLE
9 SDADC_RES_UPDATED_EVERY_INT
10 SDADC_NO_ROUNDING
settings3- settings for the SD1CON3 register of the SD ADC module. See the device's .h file for all
options. Some options include:
11 SDADC_CLOCK_DIV_1
12 SDADC_OSR_1024
13 SDADC_CLK_SYSTEM
Returns:
Nothing
Function:
To setup the Sigma-Delta Analog to Digital Converter (SD ADC) module.
Availability:
Only devices with a SD ADC module.
Examples:
setup_sd_adc(SDADC_ENABLED | SDADC_DITHER_LOW,
SDADC_CHOPPING_ENABLED | SDADC_INT_EVERY_5TH_SAMPLE |
SDADC_RES_UPDATED_EVERY_INT, SDADC_CLK_SYSTEM |
SDADC_CLOCK_DIV_4);
Example Files:
None
Also See:
set_sd_adc_channel(), read_sd_adc(), set_sd_adc_calibration()
238
Built-in Functions
setup_smtx( )
Syntax:
setup_smt1(mode,[period]);
setup_smt2(mode,[period]);
Parameters:
mode - The setup of the SMT module. See the device's .h file for all aoptions. Some
typical options include:
SMT_ENABLED
SMT_MODE_TIMER
SMT_MODE_GATED_TIMER
SMT_MODE_PERIOD_DUTY_CYCLE_ACQ
period - Optional parameter for specifying the overflow value of the SMT timer, defaults
to maximum value if not specified.
Returns:
Nothing
Function:
Configures the Signal Measurement Timer (SMT) module.
Availability:
Examples:
Only devices with a built-in SMT module.
Example Files:
None
Also See:
smtx_status(), stmx_start(), smtx_stop(), smtx_update(), smtx_reset_timer(),
smtx_read(), smtx_write()
setup_smt1(SMT_ENABLED | SMT_MODE_PERIOD_DUTY_CYCLE_ACQ|
SMT_REPEAT_DATA_ACQ_MODE | SMT_CLK_FOSC);
setup_spi( ) setup_spi2( )
Syntax:
setup_spi (mode)
setup_spi2 (mode)
Parameters:
mode may be:






SPI_MASTER, SPI_SLAVE, SPI_SS_DISABLED
SPI_L_TO_H, SPI_H_TO_L
SPI_CLK_DIV_4, SPI_CLK_DIV_16,
SPI_CLK_DIV_64, SPI_CLK_T2
SPI_SAMPLE_AT_END, SPI_XMIT_L_TO_H
Constants from each group may be or'ed together with |.
Returns:
undefined
Function:
Initializes the Serial Port Interface (SPI). This is used for 2 or 3 wire serial devices that follow a common
clock/data protocol.
spi_write(), spi_read(), spi_data_is_in(), SPI Overview
Also See:
239
CCSC_March 2015-1
setup_timer_A( )
Syntax:
setup_timer_A (mode);
Parameters:
mode values may be:
· TA_OFF, TA_INTERNAL, TA_EXT_H_TO_L, TA_EXT_L_TO_H
· TA_DIV_1, TA_DIV_2, TA_DIV_4, TA_DIV_8, TA_DIV_16, TA_DIV_32,
TA_DIV_64, TA_DIV_128, TA_DIV_256
· constants from different groups may be or'ed together with |.
Returns:
undefined
Function:
sets up Timer A.
Availability:
This function is only available on devices with Timer A hardware.
Requires:
Constants are defined in the device's .h file.
Examples:
setup_timer_A(TA_OFF);
setup_timer_A(TA_INTERNAL | TA_DIV_256);
setup_timer_A(TA_EXT_L_TO_H | TA_DIV_1);
Example Files:
none
Also See:
get_timerA( ), set_timerA( ), TimerA Overview
setup_timer_B( )
Syntax:
setup_timer_B (mode);
Parameters:
mode values may be:
· TB_OFF, TB_INTERNAL, TB_EXT_H_TO_L, TB_EXT_L_TO_H
· TB_DIV_1, TB_DIV_2, TB_DIV_4, TB_DIV_8, TB_DIV_16, TB_DIV_32,
TB_DIV_64, TB_DIV_128, TB_DIV_256
· constants from different groups may be or'ed together with |.
Returns:
undefined
Function:
sets up Timer B
Availability:
This function is only available on devices with Timer B hardware.
Requires:
Constants are defined in device's .h file.
Examples:
setup_timer_B(TB_OFF);
setup_timer_B(TB_INTERNAL | TB_DIV_256);
setup_timer_B(TA_EXT_L_TO_H | TB_DIV_1);
Example Files:
none
Also See:
get_timerB( ), set_timerB( ), TimerB Overview
240
Built-in Functions
setup_timer_1( )
Syntax:
setup_timer_1 (mode)
Parameters:
mode values may be:

T1_DISABLED, T1_INTERNAL, T1_EXTERNAL, T1_EXTERNAL_SYNC

T1_CLK_OUT

T1_DIV_BY_1, T1_DIV_BY_2, T1_DIV_BY_4, T1_DIV_BY_8

constants from different groups may be or'ed together with |.
Returns:
undefined
Function:
Initializes timer 1. The timer value may be read and written to using SET_TIMER1() and
GET_TIMER1()Timer 1 is a 16 bit timer.
With an internal clock at 20mhz and with the T1_DIV_BY_8 mode, the timer will increment every 1.6us.
It will overflow every 104.8576ms.
Availability:
This function is only available on devices with timer 1 hardware.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_timer_1 ( T1_DISABLED );
setup_timer_1 ( T1_INTERNAL | T1_DIV_BY_4 );
setup_timer_1 ( T1_INTERNAL | T1_DIV_BY_8 );
Example Files:
Also See:
get_timer1(), set_timer1() , Timer1 Overview
setup_timer_2( )
Syntax:
setup_timer_2 (mode, period, postscale)
Parameters:
mode may be one of:

T2_DISABLED

T2_DIV_BY_1, T2_DIV_BY_4, T2_DIV_BY_16
Period is a int 0-255 that determines when the clock value is reset
Postscale is a number 1-16 that determines how many timer overflows
before an interrupt: (1 means once, 2 means twice, an so on)
Returns:
undefined
Function:
Initializes timer 2. The mode specifies the clock divisor (from the oscillator clock).
The timer value may be read and written to using GET_TIMER2() and SET_TIMER2().
2 is a 8-bit counter/timer.
Availability:
This function is only available on devices with timer 2 hardware.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_timer_2 ( T2_DIV_BY_4, 0xc0, 2)
//at 20mhz, the timer will
//increment every 800ns
//will overflow every 154.4us,
//and will interrupt every 308.us
Example Files:
241
CCSC_March 2015-1
Also See:
get_timer2(), set_timer2() , Timer2 Overview
setup_timer_3( )
Syntax:
setup_timer_3 (mode)
Parameters:
Mode may be one of the following constants from each group or'ed (via |) together:

T3_DISABLED, T3_INTERNAL, T3_EXTERNAL, T3_EXTERNAL_SYNC

T3_DIV_BY_1, T3_DIV_BY_2, T3_DIV_BY_4, T3_DIV_BY_8
Returns:
undefined
Function:
Initializes timer 3 or 4.The mode specifies the clock divisor (from the oscillator clock). The timer value
may be read and written to using GET_TIMER3() and SET_TIMER3(). Timer 3 is a 16 bit counter/timer.
Availability:
This function is only available on devices with timer 3 hardware.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_timer_3 (T3_INTERNAL | T3_DIV_BY_2);
Example Files:
None
Also See:
get_timer3(), set_timer3()
setup_timer_4( )
Syntax:
setup_timer_4 (mode, period, postscale)
Parameters:
mode may be one of:

T4_DISABLED, T4_DIV_BY_1, T4_DIV_BY_4, T4_DIV_BY_16
period is a int 0-255 that determines when the clock value is reset,
postscale is a number 1-16 that determines how many timer overflows
before an interrupt: (1 means once, 2 means twice, and so on).
Returns:
undefined
Function:
Initializes timer 4. The mode specifies the clock divisor (from the oscillator clock).
The timer value may be read and written to using GET_TIMER4() and SET_TIMER4().
Timer 4 is a 8 bit counter/timer.
Availability:
This function is only available on devices with timer 4 hardware.
Requires:
Constants are defined in the devices .h file
Examples:
setup_timer_4 ( T4_DIV_BY_4, 0xc0, 2);
// At 20mhz, the timer will increment every 800ns,
// will overflow every 153.6us,
// and will interrupt every 307.2us.
Example Files:
242
Built-in Functions
Also See:
get_timer4(), set_timer4()
setup_timer_5( )
Syntax:
setup_timer_5 (mode)
Parameters:
mode may be one or two of the constants defined in the devices .h file.
T5_DISABLED, T5_INTERNAL, T5_EXTERNAL, or T5_EXTERNAL_SYNC
T5_DIV_BY_1, T5_DIV_BY_2, T5_DIV_BY_4, T5_DIV_BY_8
T5_ONE_SHOT, T5_DISABLE_SE_RESET, or T5_ENABLE_DURING_SLEEP
Returns:
undefined
Function:
Initializes timer 5. The mode specifies the clock divisor (from the oscillator clock). The timer value may
be read and written to using GET_TIMER5() and SET_TIMER5(). Timer 5 is a 16 bit counter/timer.
Availability:
This function is only available on devices with timer 5 hardware.
Requires:
Constants are defined in the devices .h file.
Examples:
setup_timer_5 (T5_INTERNAL | T5_DIV_BY_2);
Example Files:
None
Also See:
get_timer5(), set_timer5(), Timer5 Overview
setup_uart( )
Syntax:
setup_uart(baud, stream)
setup_uart(baud)
setup_uart(baud, stream, clock)
Parameters:
baud is a constant representing the number of bits per second. A one or zero may also be passed to
control the on/off status.
Stream is an optional stream identifier.
Chips with the advanced UART may also use the following constants:
UART_ADDRESS UART only accepts data with 9th bit=1
UART_DATA UART accepts all data
Chips with the EUART H/W may use the following constants:
UART_AUTODETECT Waits for 0x55 character and sets the UART baud rate to match.
UART_AUTODETECT_NOWAIT Same as above function, except returns before 0x55 is received.
KBHIT() will be true when the match is made. A call to GETC() will clear the character.
UART_WAKEUP_ON_RDA Wakes PIC up out of sleep when RCV goes from high to low
clock - If specified this is the clock rate this function should assume. The default comes from the #USE
DELAY.
243
CCSC_March 2015-1
Returns:
undefined
Function:
Very similar to SET_UART_SPEED. If 1 is passed as a parameter, the UART is turned on, and if 0 is
passed, UART is turned off. If a BAUD rate is passed to it, the UART is also turned on, if not already on.
Availability:
This function is only available on devices with a built in UART.
Requires:
#USE RS232
Examples:
setup_uart(9600);
setup_uart(9600, rsOut);
Example Files:
None
Also See:
#USE RS232, putc(), getc(), RS232 I/O Overview
setup_vref( )
Syntax:
setup_vref (mode | value )
Parameters:
mode may be one of the following constants:

FALSE
(off)

VREF_LOW
for VDD*VALUE/24

VREF_HIGH
for VDD*VALUE/32 + VDD/4

any may be or'ed with VREF_A2.
value is an int 0-15.
Also See:
Voltage Reference Overview
setup_wdt( )
Syntax:
setup_wdt (mode)
Parameters:
Constants like: WDT_18MS, WDT_36MS, WDT_72MS, WDT_144MS,WDT_288MS, WDT_576MS,
WDT_1152MS, WDT_2304MS
For some parts: WDT_ON, WDT_OFF
.
Warning:
On older PIC16 devices, set-up of the prescaler may undo the timer0 prescaler.
Also See:
#FUSES , restart_wdt() , WDT or Watch Dog Timer Overview
Internal Oscillator Overview
244
Built-in Functions
setup_zdc( )
Syntax:
setup_zdc(mode);
Parameters:
mode- the setup of the ZDC module. The options for setting up the module include:





ZCD_ENABLED
ZCD_DISABLED
ZCD_INVERTED
ZCD_INT_L_TO_H
ZCD_INT_H_TO_L
Returns:
Function:
Nothing
To set-up the Zero_Cross Detection (ZCD) module.
Availability:
All devices with a ZCD module.
Examples:
setup_zcd(ZCD_ENABLE|ZCD_INT_H_TO_L);
Example Files:
None
Also See:
zcd_status()
shift_left( )
Syntax:
shift_left (address, bytes, value)
Parameters:
address is a pointer to memory.
bytes is a count of the number of bytes to work with
value is a 0 to 1 to be shifted in.
Returns:
0 or 1 for the bit shifted out
Function:
Shifts a bit into an array or structure. The address may be an array identifier or an address to a structure
(such as &data). Bit 0 of the lowest byte in RAM is treated as the LSB.
Availability:
All devices
Requires:
Nothing
Examples:
byte buffer[3];
for(i=0; i<=24; ++i){
// Wait for clock high
while (!input(PIN_A2));
shift_left(buffer,3,input(PIN_A3));
// Wait for clock low
while (input(PIN_A2));
}
// reads 24 bits from pin A3,each bit is read
// on a low to high on pin A2
Example Files:
ex_extee.c, 9356.c
245
CCSC_March 2015-1
Also See:
shift_right(), rotate_right(), rotate_left(),
shift_right( )
Syntax:
shift_right (address, bytes, value)
Parameters:
address is a pointer to memory
bytes is a count of the number of bytes to work with
value is a 0 to 1 to be shifted in.
Returns:
0 or 1 for the bit shifted out
Function:
Shifts a bit into an array or structure. The address may be an array identifier or an address to a
structure (such as &data). Bit 0 of the lowest byte in RAM is treated as the LSB.
Availability:
All devices
Requires:
Nothing
Examples:
// reads 16 bits from pin A1, each bit is read
// on a low to high on pin A2
struct {
byte time;
byte command : 4;
byte source : 4;} msg;
for(i=0; i<=16; ++i) {
while(!input(PIN_A2));
shift_right(&msg,3,input(PIN_A1));
while (input(PIN_A2)) ;}
// This shifts 8 bits out PIN_A0, LSB first.
for(i=0;i<8;++i)
output_bit(PIN_A0,shift_right(&data,1,0));
Example Files:
ex_extee.c, 9356.c
Also See:
shift_left(), rotate_right(), rotate_left(),
sleep( )
Syntax:
sleep(mode)
Parameters:
mode - for most chips this is not used. Check the device header for special options on some chips.
Returns:
Undefined
Function:
Issues a SLEEP instruction. Details are device dependent. However, in general the part will enter low
power mode and halt program execution until woken by specific external events. Depending on the
cause of the wake up execution may continue after the sleep instruction. The compiler inserts a sleep()
after the last statement in main().
Availability:
All devices
246
Built-in Functions
Requires:
Nothing
Examples:
SLEEP();
Example Files:
ex_wakup.c
Also See:
reset cpu()
sleep_ulpwu( )
Syntax:
sleep_ulpwu(time)
Parameters:
time specifies how long, in us, to charge the capacitor on the ultra-low power wakeup pin (by
outputting a high on PIN_A0).
Returns:
undefined
Function:
Charges the ultra-low power wake-up capacitor on PIN_A0 for time microseconds, and then puts the
PIC to sleep. The PIC will then wake-up on an 'Interrupt-on-Change' after the charge on the cap is
lost.
Availability:
Ultra Low Power Wake-Up support on the PIC (example, PIC12F683)
Requires:
#USE DELAY
Examples:
while(TRUE)
{
if (input(PIN_A1))
//do something
else
sleep_ulpwu(10);
//cap will be charged for 10us,
//then goto sleep
}
Example Files:
None
Also See:
#USE DELAY
sleep_ulpwu( )
Syntax:
sleep_ulpwu(time)
Parameters:
time specifies how long, in us, to charge the capacitor on the ultra-low power wakeup pin (by
outputting a high on PIN_B0).
Returns:
undefined
Function:
Charges the ultra-low power wake-up capacitor on PIN_B0 for time microseconds, and then puts the
PIC to sleep. The PIC will then wake-up on an 'Interrupt-on-Change' after the charge on the cap is
lost.
Availability:
Ultra Low Power Wake-Up support on the PIC (example, PIC124F32KA302)
Requires:
#USE DELAY
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CCSC_March 2015-1
Examples:
while(TRUE)
{
if (input(PIN_A1))
//do something
else
sleep_ulpwu(10);
//cap will be charged for 10us,
//then goto sleep
}
Example Files:
None
Also See:
#USE DELAY
smtx_read( )
Syntax:
value_smt1_read(which);
value_smt2_read(which);
Parameters:
which - Specifies which SMT registers to read. The following defines have been made
in the device's header file to select which registers are read:
SMT_CAPTURED_PERIOD_REG
SMT_CAPTURED_PULSE_WIDTH_REG
SMT_TMR_REG
SMT_PERIOD_REG
Returns:
32-bit value
Function:
To read the Capture Period Registers, Capture Pulse Width Registers,
Timer Registers or Period Registers of the Signal Measurement Timer module.
Availability:
Examples:
Only devices with a built-in SMT module.
unsigned int32 Period;
Period = smt1_read(SMT_CAPTURED_PERIOD_REG);
Example Files:
None
Also See:
smtx_status(), stmx_start(), smtx_stop(), smtx_update(), smtx_reset_timer(),
setup_SMTx(), smtx_write()
smtx_reset_timer( )
Syntax:
smt1_reset_timer();
smt2_reset_timer();
Parameters:
None
Returns:
Nothing
Fun
To manually reset the Timer Register of the Signal Measurement Timer module.
248
Built-in Functions
ctio
n:
Availability:
Examples:
Only devices with a built-in SMT module.
smt1_reset_timer();
Example Files:
None
Also See:
setup_smtx(), stmx_start(), smtx_stop(), smtx_update(), smtx_status(),
smtx_read(), smtx_write()
smtx_start( )
Syntax:
smt1_start();
smt2_start();
Parameters:
None
Returns:
Nothing
Function:
To have the Signal Measurement Timer (SMT) module start acquiring data.
Availability:
Examples:
Only devices with a built-in SMT module.
Example Files:
None
Also See:
smtx_status(), setup_smtx(), smtx_stop(), smtx_update(), smtx_reset_timer(),
smtx_read(), smtx_write()
smt1_start();
smtx_status( )
Syntax:
value = smt1_status();
value = smt2_status();
Parameters:
None
Returns:
The status of the SMT module.
Function:
To return the status of the Signal Measurement Timer (SMT) module.
Availability:
Examples:
Only devices with a built-in SMT module.
Example Files:
None
status = smt1_status();
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CCSC_March 2015-1
Also
See:
setup_smtx(), stmx_start(), smtx_stop(), smtx_update(), smtx_reset_timer(),
smtx_read(), smtx_write()
smtx_stop( )
Syntax:
smt1_stop();
smt2_stop();
Parameters:
None
Returns:
Nothing
Function:
Configures the Signal Measurement Timer (SMT) module.
Availability:
Exa
mple
s:
Exa
mple
Files
:
Also
See:
Only devices with a built-in SMT module.
smt1_stop()
None
smtx_status(), stmx_start(), setup_smtx(), smtx_update(), smtx_reset_timer(),
smtx_read(), smtx_write()
smtx_write( )
Syntax:
smt1_write(which,value);
smt2_write(which,value);
Parameters:
which - Specifies which SMT registers to write. The following defines have been made
in the device's header file to select which registers are written:
SMT_TMR_REG
SMT_PERIOD_REG
value - The 24-bit value to set the specified registers.
Returns:
Nothing
Function:
To write the Timer Registers or Period Registers of the Signal Measurement
Timer (SMT) module
Availability:
Examples:
Only devices with a built-in SMT module.
Example Files:
None
250
smt1_write(SMT_PERIOD_REG, 0x100000000);
Built-in Functions
Also See:
smtx_status(), stmx_start(), setup_smtx(), smtx_update(), smtx_reset_timer(),
smtx_read(), setup_smtx()
smtx_update( )
Syntax:
smt1_update(which);
smt2_update(which);
Parameters:
which - Specifies which capture registers to manually update. The following defines
have been made in the device's header file to select which registers are updated:
SMT_CAPTURED_PERIOD_REG
SMT_CAPTURED_PULSE_WIDTH_REG
Returns:
Nothing
Function:
To manually update the Capture Period Registers or the Capture Pulse Width
Registers of the Signal Measurement Timer module.
Availability:
Examples:
Only devices with a built-in SMT module.
Example Files:
None
Also See:
setup_smtx(), stmx_start(), smtx_stop(), smtx_status(), smtx_reset_timer(),
smtx_read(), smtx_write()
smt1_update(SMT_CAPTURED_PERIOD_REG);
spi_data_is_in( ) spi_data_is_in2( )
Syntax:
result = spi_data_is_in()
result = spi_data_is_in2()
Parameters:
None
Returns:
0 (FALSE) or 1 (TRUE)
Function:
Returns TRUE if data has been received over the SPI.
Availability:
This function is only available on devices with SPI hardware.
Requires:
Nothing
Examples:
while
( !spi_data_is_in() && input(PIN_B2) );
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if( spi_data_is_in() )
data = spi_read();
Example Files:
None
Also See:
spi_read(), spi_write(), SPI Overview
spi_init()
Syntax:
spi_init(baud);
spi_init(stream,baud);
Parameters:
stream – is the SPI stream to use as defined in the STREAM=name option in #USE SPI.
band- the band rate to initialize the SPI module to. If FALSE it will disable the SPI module, if TRUE it
will enable the SPI module to the band rate specified in #use SPI.
Returns:
Nothing.
Function:
Initializes the SPI module to the settings specified in #USE SPI.
Availability:
This function is only available on devices with SPI hardware.
Requires:
#USE SPI
Examples:
while
#use spi(MATER, SPI1, baud=1000000, mode=0, stream=SPI1_MODE0)
spi_inspi_init(SPI1_MODE0, TRUE); //initialize and enable SPI1 to setting in #USE SPI
spi_inspi_init(FALSE); //disable SPI1
spi_inspi_init(250000);//initialize and enable SPI1 to a baud rate of 250K
Example Files:
None
Also See:
#USE SPI, spi_xfer(), spi_xfer_in(), spi_prewrite(), spi_speed()
spi_prewrite(data);
Syntax:
spi_prewrite(data);
spi_prewrite(stream, data);
Parameters:
stream – is the SPI stream to use as defined in the STREAM=name option in #USE SPI.
data- the variable or constant to transfer via SPI
Nothing.
Returns:
Function:
Availability:
Writes data into the SPI buffer without waiting for transfer to be completed. Can be used in
conjunction with spi_xfer() with no parameters to transfer more then 8 bits for PCM and PCH device,
or more then 8 bits or 16 bits (XFER16 option) for PCD. Function is useful when using the SSP or
SSP2 interrupt service routines for PCM and PCH device, or the SPIx interrupt service routines for
PCD device.
This function is only available on devices with SPI hardware.
Requires:
Examples:
Example Files:
#USE SPI, and the option SLAVE is used in #USE SPI to setup PIC as a SPI slave device
spi_prewrite(data_out);
ex_spi_slave.c
Also See:
#USE SPI, spi_xfer(), spi_xfer_in(), spi_init(), spi_speed()
252
Built-in Functions
spi_read( ) spi_read2( )
Syntax:
value = spi_read ([data])
value = spi_read2 ([data])
Parameters:
data – optional parameter and if included is an 8 bit int.
Returns:
An 8 bit int
Function:
Return a value read by the SPI. If a value is passed to the spi_read() the data will be clocked out
and the data received will be returned. If no data is ready, spi_read() will wait for the data is a
SLAVE or return the last DATA clocked in from spi_write().
If this device is the MASTER then either do a spi_write(data) followed by a spi_read() or do a
spi_read(data). These both do the same thing and will generate a clock. If there is no data to send
just do a spi_read(0) to get the clock.
Availability:
If this device is a SLAVE then either call spi_read() to wait for the clock and data or
use_spi_data_is_in() to determine if data is ready.
This function is only available on devices with SPI hardware.
Requires:
Nothing
Examples:
data_in = spi_read(out_data);
Example Files:
ex_spi.c
Also See:
spi_write(), , , spi_data_is_in(), SPI Overview
spi_read_16()
spi_read2_16()
spi_read3_16()
spi_read4_16()
Syntax:
value = spi_read_16([data]);
value = spi_read2_16([data]);
value = spi_read3_16([data]);
value = spi_read4_16([data]);
Parameters:
data – optional parameter and if included is a 16 bit int
Returns:
A 16 bit int
Function:
Return a value read by the SPI. If a value is passed to the spi_read_16() the data will be clocked
out and the data received will be returned. If no data is ready, spi_read_16() will wait for the data is
a SLAVE or return the last DATA clocked in from spi_write_16().
If this device is the MASTER then either do a spi_write_16(data) followed by a spi_read_16() or do
253
CCSC_March 2015-1
a spi_read_16(data). These both do the same thing and will generate a clock. If there is no data to
send just do a spi_read_16(0) to get the clock.
If this device is a slave then either call spi_read_16() to wait for the clock and data or
use_spi_data_is_in() to determine if data is ready.
Availability:
This function is only available on devices with SPI hardware.
Requires:
NThat the option SPI_MODE_16B be used in setup_spi() function, or that the option XFER16 be
used in #use SPI(
Examples:
data_in = spi_read_16(out_data);
Example Files:
Also See:
None
spi_read(), spi_write(), spi_write_16(), spi_data_is_in(), SPI Overview
spi_speed
Syntax:
spi_speed(baud);
spi_speed(stream,baud);
spi_speed(stream,baud,clock);
Parameters:
stream – is the SPI stream to use as defined in the STREAM=name option in #USE SPI.
band- the band rate to set the SPI module to
clock- the current clock rate to calculate the band rate with.
If not specified it uses the value specified in #use delay ().
Returns:
Nothing.
Function:
Sets the SPI module's baud rate to the specified value.
Availability:
This function is only available on devices with SPI hardware.
Requires:
#USE SPI
Examples:
Example Files:
spi_speed(250000);
spi_speed(SPI1_MODE0, 250000);
spi_speed(SPI1_MODE0, 125000, 8000000);
None
Also See:
#USE SPI, spi_xfer(), spi_xfer_in(), spi_prewrite(), spi_init()
spi_write( ) spi_write2( )
Syntax:
spi_write([wait],value);
spi_write2([wait],value);
Parameters:
value is an 8 bit int
wait- an optional parameter specifying whether the function will wait for the SPI transfer to complete
before exiting. Default is TRUE if not specified.
Returns:
Nothing
Function:
Sends a byte out the SPI interface. This will cause 8 clocks to be generated. This function will write
254
Built-in Functions
the value out to the SPI. At the same time data is clocked out data is clocked in and stored in a
receive buffer. spi_read() may be used to read the buffer.
Availability:
This function is only available on devices with SPI hardware.
Requires:
Nothing
Examples:
spi_write( data_out );
data_in = spi_read();
Example Files:
ex_spi.c
Also See:
spi_read(), spi_data_is_in(), SPI Overview, spi_write_16(), spi_read_16()
spi_xfer( )
Syntax:
spi_xfer(data)
spi_xfer(stream, data)
spi_xfer(stream, data, bits)
result = spi_xfer(data)
result = spi_xfer(stream, data)
result = spi_xfer(stream, data, bits)
Parameters:
data is the variable or constant to transfer via SPI. The pin used to transfer data is defined in the
DO=pin option in #use spi. stream is the SPI stream to use as defined in the STREAM=name
option in #USE SPI.
bits is how many bits of data will be transferred.
Returns:
The data read in from the SPI. The pin used to transfer result is defined in the DI=pin option in
#USE SPI.
Function:
Transfers data to and reads data from an SPI device.
Availability:
All devices with SPI support.
Requires:
#USE SPI
Examples:
int i = 34;
spi_xfer(i);
// transfers the number 34 via SPI
int trans = 34, res;
res = spi_xfer(trans);
// transfers the number 34 via SPI
// also reads the number coming in from SPI
Example Files:
None
Also See:
#USE SPI
SPII_XFER_IN()
Syntax:
value = spi_xfer_in();
value = spi_xfer_in(bits);
value = spi_xfer_in(stream,bits);
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CCSC_March 2015-1
Returns:
stream – is the SPI stream to use as defined in the STREAM=name option in #USE SPI.
bits – is how many bits of data to be received.
The data read in from the SPI
Function:
Reads data from the SPI, without writing data into the transmit buffer first.
Availability:
This function is only available on devices with SPI hardware.
Requires:
Examples:
#USE SPI, and the option SLAVE is used in #USE SPI to setup PIC as a SPI slave device.
Example Files:
ex_spi_slave.c
Also See:
#USE SPI, spi_xfer(), spi_prewrite(), spi_init(), spi_speed()
Parameters:
data_in = spi_xfer_in();
sprintf( )
Syntax:
sprintf(string, cstring, values...);
bytes=sprintf(string, cstring, values...)
Parameters:
string is an array of characters.
cstring is a constant string or an array of characters null terminated.
Values are a list of variables separated by commas. Note that format specifies do not work in
ram band strings.
Returns:
Bytes is the number of bytes written to string.
Function:
This function operates like printf() except that the output is placed into the specified string. The
output string will be terminated with a null. No checking is done to ensure the string is large enough
for the data. See printf() for details on formatting.
Availability:
All devices.
Requires:
Nothing
Examples:
char mystring[20];
long mylong;
mylong=1234;
sprintf(mystring,"<%lu>",mylong);
// mystring now has:
//
< 1 2 3 4 > \0
Example Files:
None
Also See:
printf()
sqrt( )
Syntax:
result = sqrt (value)
Parameters:
value is a float
Returns:
A float
256
Built-in Functions
Function:
Computes the non-negative square root of the float value x. If the argument is negative, the
behavior is undefined.
Note on error handling:
If "errno.h" is included then the domain and range errors are stored in the errno variable. The user
can check the errno to see if an error has occurred and print the error using the perror function.
Domain error occurs in the following cases:
sqrt: when the argument is negative
Availability:
All devices.
Requires:
#INCLUDE <math.h>
Examples:
distance = sqrt( pow((x1-x2),2)+pow((y1-y2),2) );
Example Files:
None
Also See:
None
srand( )
Syntax:
srand(n)
Parameters:
n is the seed for a new sequence of pseudo-random numbers to be returned by subsequent calls to
rand.
Returns:
No value.
Function:
The srand() function uses the argument as a seed for a new sequence of pseudo-random numbers
to be returned by subsequent calls to rand. If srand() is then called with same seed value, the
sequence of random numbers shall be repeated. If rand is called before any call to srand() have
been made, the same sequence shall be generated as when srand() is first called with a seed value
of 1.
Availability:
All devices.
Requires:
#INCLUDE <STDLIB.H>
Examples:
srand(10);
I=rand();
Example Files:
None
Also See:
rand()
strcpy( ) strcopy( )
Syntax:
strcpy (dest, src)
strcopy (dest, src)
Parameters:
dest is a pointer to a RAM array of characters.
257
CCSC_March 2015-1
src may be either a pointer to a RAM array of characters or it may be a constant string.
Returns:
undefined
Function:
Copies a constant or RAM string to a RAM string. Strings are terminated with a 0.
Availability:
All devices.
Requires:
Nothing
Examples:
char string[10], string2[10];
.
.
.
strcpy (string, "Hi There");
strcpy(string2,string);
Example Files:
ex_str.c
Also See:
strxxxx()
strtod( )
Syntax:
result=strtod(nptr,& endptr)
Parameters:
nptr and endptr are strings
Returns:
result is a float.
returns the converted value in result, if any. If no conversion could be performed, zero is returned.
Function:
The strtod function converts the initial portion of the string pointed to by nptr to a float
representation. The part of the string after conversion is stored in the object pointed to endptr,
provided that endptr is not a null pointer. If nptr is empty or does not have the expected form, no
conversion is performed and the value of nptr is stored in the object pointed to by endptr, provided
endptr is not a null pointer.
Availability:
All devices.
Requires:
#INCLUDE <stdlib.h>
Examples:
float result;
char str[12]="123.45hello";
char *ptr;
result=strtod(str,&ptr);
//result is 123.45 and ptr is "hello"
Example Files:
None
Also See:
strtol(), strtoul()
strtok( )
Syntax:
258
ptr = strtok(s1, s2)
Built-in Functions
Parameters:
s1 and s2 are pointers to an array of characters (or the name of an array). Note that s1 and s2
MAY NOT BE A CONSTANT (like "hi"). s1 may be 0 to indicate a continue operation.
Returns:
ptr points to a character in s1 or is 0
Function:
Finds next token in s1 delimited by a character from separator string s2 (which can be different from
call to call), and returns pointer to it.
First call starts at beginning of s1 searching for the first character NOT contained in s2 and returns
null if there is none are found.
If none are found, it is the start of first token (return value). Function then searches from there for a
character contained in s2.
If none are found, current token extends to the end of s1, and subsequent searches for a token will
return null.
If one is found, it is overwritten by '\0', which terminates current token. Function saves pointer to
following character from which next search will start.
Each subsequent call, with 0 as first argument, starts searching from the saved pointer.
Availability:
All devices.
Requires:
#INCLUDE <string.h>
Examples:
char string[30], term[3], *ptr;
strcpy(string,"one,two,three;");
strcpy(term,",;");
ptr = strtok(string, term);
while(ptr!=0) {
puts(ptr);
ptr = strtok(0, term);
}
// Prints:
one
two
three
Example Files:
ex_str.c
Also See:
strxxxx(), strcpy()
strtol( )
Syntax:
result=strtol(nptr,& endptr, base)
Parameters:
nptr and endptr are strings and base is an integer
Returns:
result is a signed long int.
returns the converted value in result , if any. If no conversion could be performed, zero is returned.
Function:
The strtol function converts the initial portion of the string pointed to by nptr to a signed long int
representation in some radix determined by the value of base. The part of the string after conversion
is stored in the object pointed to endptr, provided that endptr is not a null pointer. If nptr is empty or
does not have the expected form, no conversion is performed and the value of nptr is stored in the
259
CCSC_March 2015-1
object pointed to by endptr, provided endptr is not a null pointer.
Availability:
All devices.
Requires:
#INCLUDE <stdlib.h>
Examples:
signed long result;
char str[9]="123hello";
char *ptr;
result=strtol(str,&ptr,10);
//result is 123 and ptr is "hello"
Example Files:
None
Also See:
strtod(), strtoul()
strtoul( )
Syntax:
result=strtoul(nptr,endptr, base)
Parameters:
nptr and endptr are strings pointers and base is an integer 2-36.
Returns:
result is an unsigned long int.
returns the converted value in result , if any. If no conversion could be performed, zero is returned.
Function:
The strtoul function converts the initial portion of the string pointed to by nptr to a long int
representation in some radix determined by the value of base. The part of the string after conversion
is stored in the object pointed to endptr, provided that endptr is not a null pointer. If nptr is empty or
does not have the expected form, no conversion is performed and the value of nptr is stored in the
object pointed to by endptr, provided endptr is not a null pointer.
Availability:
All devices.
Requires:
STDLIB.H must be included
Examples:
long result;
char str[9]="123hello";
char *ptr;
result=strtoul(str,&ptr,10);
//result is 123 and ptr is "hello"
Example Files:
None
Also See:
strtol(), strtod()
260
Built-in Functions
swap( )
Syntax:
swap (lvalue)
Parameters:
lvalue is a byte variable
Returns:
undefined - WARNING: this function does not return the result
Function:
Swaps the upper nibble with the lower nibble of the specified byte. This is the same as:
byte = (byte << 4) | (byte >> 4);
Availability:
All devices.
Requires:
Nothing
Examples:
x=0x45;
swap(x);
//x now is 0x54
Example Files:
None
Also See:
rotate_right(), rotate_left()
tolower( ) toupper( )
Syntax:
result = tolower (cvalue)
result = toupper (cvalue)
Parameters:
cvalue is a character
Returns:
An 8 bit character
Function:
These functions change the case of letters in the alphabet.
TOLOWER(X) will return 'a'..'z' for X in 'A'..'Z' and all other characters are unchanged.
TOUPPER(X) will return 'A'..'Z' for X in 'a'..'z' and all other characters are unchanged.
Availability:
All devices.
Requires:
Nothing
Examples:
switch(
case
case
case
}
Example Files:
ex_str.c
Also See:
None
toupper(getc()) ) {
'R' : read_cmd(); break;
'W' : write_cmd(); break;
'Q' : done=TRUE;
break;
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CCSC_March 2015-1
touchpad_getc( )
Syntax:
input = TOUCHPAD_GETC( );
Parameters:
None
Returns:
char (returns corresponding ASCII number is “input” declared as int)
Function:
Actively waits for firmware to signal that a pre-declared Capacitive Sensing Module (CSM) or charge
time measurement unit (CTMU) pin is active, then stores the pre-declared character value of that
pin in “input”.
Note: Until a CSM or CTMU pin is read by firmware as active, this instruction will cause the
microcontroller to stall.
Availability:
All PIC's with a CSM or CTMU Module
Requires:
#USE TOUCHPAD (options)
Examples:
//When the pad connected to PIN_B0 is activated, store the letter 'A'
#USE TOUCHPAD (PIN_B0='A')
void main(void){
char c;
enable_interrupts(GLOBAL);
c = TOUCHPAD_GETC();
//will wait until one of declared pins is detected
//if PIN_B0 is pressed, c will get value 'A'
}
Example Files:
None
Also See:
#USE TOUCHPAD, touchpad_state( )
touchpad_hit( )
Syntax:
value = TOUCHPAD_HIT( )
Parameters:
None
Returns:
TRUE or FALSE
Function:
Returns TRUE if a Capacitive Sensing Module (CSM) or Charge Time Measurement Unit (CTMU)
key has been pressed. If TRUE, then a call to touchpad_getc() will not cause the program to wait for
a key press.
Availability:
All PIC's with a CSM or CTMU Module
Requires:
#USE TOUCHPAD (options)
Examples:
// When the pad connected to PIN_B0 is activated, store the letter 'A'
#USE TOUCHPAD (PIN_B0='A')
void main(void){
char c;
enable_interrupts(GLOBAL);
262
Built-in Functions
while (TRUE) {
if ( TOUCHPAD_HIT() )
//wait until key on PIN_B0 is pressed
c = TOUCHPAD_GETC();
//get key that was pressed
}
//c will get value 'A'
}
Example Files:
None
Also See:
#USE TOUCHPAD ( ), touchpad_state( ), touchpad_getc( )
touchpad_state( )
Syntax:
TOUCHPAD_STATE (state);
Parameters:
state is a literal 0, 1, or 2.
Returns:
None
Function:
Sets the current state of the touchpad connected to the Capacitive Sensing Module (CSM). The
state can be one of the following three values:
0 : Normal state
1 : Calibrates, then enters normal state
2 : Test mode, data from each key is collected in the int16 array TOUCHDATA
Note: If the state is set to 1 while a key is being pressed, the touchpad will not calibrate properly.
Availability:
All PIC's with a CSM Module
Requires:
#USE TOUCHPAD (options)
Examples:
#USE TOUCHPAD (THRESHOLD=5, PIN_D5='5', PIN_B0='C')
void main(void){
char c;
TOUCHPAD_STATE(1);
//calibrates, then enters normal state
enable_interrupts(GLOBAL);
while(1){
c = TOUCHPAD_GETC();
//will wait until one of declared pins is detected
}
//if PIN_B0 is pressed, c will get value 'C'
}
//if PIN_D5 is pressed, c will get value '5'
Example Files:
None
Also See:
#USE TOUCHPAD, touchpad_getc( ), touchpad_hit( )
tolower( ) toupper( )
Syntax:
result = tolower (cvalue)
result = toupper (cvalue)
Parameters:
cvalue is a character
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CCSC_March 2015-1
Returns:
An 8 bit character
Function:
These functions change the case of letters in the alphabet.
TOLOWER(X) will return 'a'..'z' for X in 'A'..'Z' and all other characters are unchanged.
TOUPPER(X) will return 'A'..'Z' for X in 'a'..'z' and all other characters are unchanged.
Availability:
All devices.
Requires:
Nothing
Examples:
switch(
case
case
case
}
Example Files:
ex_str.c
Also See:
None
toupper(getc()) ) {
'R' : read_cmd(); break;
'W' : write_cmd(); break;
'Q' : done=TRUE;
break;
tx_buffer_bytes()
Syntax:
Parameters:
Returns:
Function:
Availability:
value = tx_buffer_bytes([stream]);
stream – optional parameter specifying the stream defined in #USE RS232.
Number of bytes in transmit buffer that still need to be sent.
Function to determine the number of bytes in transmit buffer that still need to be sent .
All devices
Requires:
Examples:
#USE RS232
#USE_RS232(UART1,BAUD=9600,TRANSMIT_BUFFER=50)
void main(void) {
char string[] = “Hello”;
if(tx_buffer_bytes() <= 45)
printf(“%s”,string);
}
None
Example Files:
Also See:
_USE_RS232( ), RCV_BUFFER_FULL( ), TX_BUFFER_FULL( ), RCV_BUFFER_BYTES( ), GET(
), PUTC( ) ,PRINTF( ), SETUP_UART( ), PUTC_SEND( )
.
tx_buffer_full( )
Syntax:
Parameters:
Returns:
Function:
264
value = tx_buffer_full([stream])
stream – optional parameter specifying the stream defined in #USE RS232
TRUE if transmit buffer is full, FALSE otherwise.
Function to determine if there is room in transmit buffer for another character.
Built-in Functions
Availability:
All devices
Requires:
Examples:
#USE RS232
#USE_RS232(UART1,BAUD=9600,TRANSMIT_BUFFER=50)
void main(void) {
char c;
if(!tx_buffer_full())
putc(c);
Example Files:
Also See:
}
None
_USE_RS232( ), RCV_BUFFER_FULL( ), TX_BUFFER_FULL( )., RCV_BUFFER_BYTES( ),
GETC( ), PUTC( ), PRINTF( ), SETUP_UART( )., PUTC_SEND( )
va_arg( )
Syntax:
va_arg(argptr, type)
Parameters:
argptr is a special argument pointer of type va_list
type – This is data type like int or char.
Returns:
The first call to va_arg after va_start return the value of the parameters after that specified by the
last parameter. Successive invocations return the values of the remaining arguments in succession.
Function:
The function will return the next argument every time it is called.
Availability:
All devices.
Requires:
#INCLUDE <stdarg.h>
Examples:
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr; // create special argument pointer
va_start(argptr,num); // initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr); // end variable processing
return sum;
}
Example Files:
None
Also See:
nargs(), va_end(), va_start()
va_end( )
Syntax:
va_end(argptr)
Parameters:
argptr is a special argument pointer of type va_list.
Returns:
None
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Function:
A call to the macro will end variable processing. This will facillitate a normal return from the function
whose variable argument list was referred to by the expansion of va_start().
Availability:
All devices.
Requires:
#INCLUDE <stdarg.h>
Examples:
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr; // create special argument pointer
va_start(argptr,num); // initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr); // end variable processing
return sum;
}
Example Files:
None
Also See:
nargs(), va_start(), va_arg()
va_start
Syntax:
va_start(argptr, variable)
Parameters:
argptr is a special argument pointer of type va_list
variable – The second parameter to va_start() is the name of the last parameter before the
variable-argument list.
Returns:
None
Function:
The function will initialize the argptr using a call to the macro va_start().
Availability:
All devices.
Requires:
#INCLUDE <stdarg.h>
Examples:
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr; // create special argument pointer
va_start(argptr,num); // initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr); // end variable processing
return sum;
}
Example Files:
None
Also See:
nargs(), va_start(), va_arg()
266
Built-in Functions
write_bank( )
Syntax:
write_bank (bank, offset, value)
Parameters:
bank is the physical RAM bank 1-3 (depending on the device)
offset is the offset into user RAM for that bank (starts at 0)
value is the 8 bit data to write
Returns:
undefined
Function:
Write a data byte to the user RAM area of the specified memory bank. This function may be used
on some devices where full RAM access by auto variables is not efficient. For example on the
PIC16C57 chip setting the pointer size to 5 bits will generate the most efficient ROM code however
auto variables can not be above 1Fh. Instead of going to 8 bit pointers you can save ROM by using
this function to write to the hard to reach banks. In this case the bank may be 1-3 and the offset may
be 0-15.
Availability:
All devices but only useful on PCB parts with memory over 1Fh and PCM parts with memory over
FFh.
Requires:
Nothing
Examples:
i=0;
// Uses bank 1 as a RS232 buffer
do {
c=getc();
write_bank(1,i++,c);
} while (c!=0x13);
Example Files:
ex_psp.c
Also See:
See the "Common Questions and Answers" section for more information.
write_configuration_memory( )
Syntax:
write_configuration_memory (dataptr, count)
Parameters:
dataptr: pointer to one or more bytes
count: a 8 bit integer
Returns:
undefined
Function:
Erases all fuses and writes count bytes from the dataptr to the configuration memory.
Availability:
All PIC18 flash devices
Requires:
Nothing
Examples:
int data[6];
write_configuration_memory(data,6)
Example Files:
None
Also See:
WRITE_PROGRAM_MEMORY(), Configuration Memory Overview
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write_eeprom( )
Syntax:
write_eeprom (address, value)
Parameters:
address is a (8 bit or 16 bit depending on the part) int, the range is device dependent
value is an 8 bit int
Returns:
undefined
Function:
Write a byte to the specified data EEPROM address. This function may take several milliseconds to
execute. This works only on devices with EEPROM built into the core of the device.
For devices with external EEPROM or with a separate EEPROM in the same package (like the
12CE671) see EX_EXTEE.c with CE51X.c, CE61X.c or CE67X.c.
Availability:
In order to allow interrupts to occur while using the write operation, use the #DEVICE option
WRITE_EEPROM = NOINT. This will allow interrupts to occur while the write_eeprom() operations
is polling the done bit to check if the write operations has completed. Can be used as long as no
EEPROM operations are performed during an ISR.
This function is only available on devices with supporting hardware on chip.
Requires:
Nothing
Examples:
#define LAST_VOLUME
10
// Location in EEPROM
volume++;
write_eeprom(LAST_VOLUME,volume);
Example Files:
ex_intee.c, ex_extee.c, ce51x.c, ce62x.c, ce67x.c
Also See:
read_eeprom(), write_program_eeprom(), read_program_eeprom(), data Eeprom Overview
write_external_memory( )
Syntax:
write_external_memory( address, dataptr, count )
Parameters:
address is 16 bits on PCM parts and 32 bits on PCH parts
dataptr is a pointer to one or more bytes
count is a 8 bit integer
Returns:
undefined
Function:
Writes count bytes to program memory from dataptr to address. Unlike write_program_eeprom()
and read_program_eeprom() this function does not use any special EEPROM/FLASH write
algorithm. The data is simply copied from register address space to program memory address
space. This is useful for external RAM or to implement an algorithm for external flash.
Availability:
Only PCH devices.
Requires:
Nothing
Examples:
for(i=0x1000;i<=0x1fff;i++) {
value=read_adc();
write_external_memory(i, value, 2);
delay_ms(1000);
}
268
Built-in Functions
Example Files:
ex_load.c, loader.c
Also See:
write_program_eeprom(), erase_program eeprom(), Program Eeprom Overview
write_extended_ram( )
Syntax:
write_extended_ram (page,address,data,count);
Parameters:
page – the page in extended RAM to write to
address – the address on the selected page to start writing to
data – pointer to the data to be written
count – the number of bytes to write (0-32768)
Returns:
undefined
Function:
To write data to the extended RAM of the PIC.
Availability:
On devices with more then 30K of RAM.
Requires:
Nothing
Examples:
unsigned int8 data[8] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};
write_extended_ram(1,0x0000,data,8);
Example Files:
None
Also See:
read_extended_ram(), Extended RAM Overview
write_program_eeprom( )
Syntax:
write_program_eeprom (address, data)
Parameters:
address is 16 bits on PCM parts and 32 bits on PCH parts, data is 16 bits. The least significant bit
should always be 0 in PCH.
Returns:
undefined
Function:
Writes to the specified program EEPROM area.
See our write_program_memory() for more information on this function.
Availability:
Only devices that allow writes to program memory.
Requires:
Nothing
Examples:
write_program_eeprom(0,0x2800);
Example Files:
ex_load.c, loader.c
Also See:
read_program_eeprom(), read_eeprom(), write_eeprom(), write_program_memory(),
erase_program_eeprom(), Program Eeprom Overview
//disables program
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write_program_memory( )
Syntax:
write_program_memory( address, dataptr, count );
Parameters:
address is 16 bits on PCM parts and 32 bits on PCH parts .
dataptr is a pointer to one or more bytes
count is a 8 bit integer on PIC16 and 16-bit for PIC18
Returns:
undefined
Function:
Writes count bytes to program memory from dataptr to address. This function is most effective when
count is a multiple of FLASH_WRITE_SIZE. Whenever this function is about to write to a location
that is a multiple of FLASH_ERASE_SIZE then an erase is performed on the whole block.
Availability:
Only devices that allow writes to program memory.
Requires:
Nothing
Examples:
for(i=0x1000;i<=0x1fff;i++) {
value=read_adc();
write_program_memory(i, value, 2);
delay_ms(1000);
}
Example Files:
loader.c
Also See:
write_program_eeprom , erase_program_eeprom , Program Eeprom Overview
Additional Notes:
Clarification about the functions to write to program memory:
In order to get the desired results while using write_program_memory(), the block of memory being
written to needs to first be read in order to save any other variables currently stored there, then
erased to clear all values in the block before the new values can be written. This is because the
write_program_memory() function does not save any values in memory and will only erase the block
if the first location is written to. If this process is not followed, when new values are written to the
block, they will appear as garbage values.
For chips where
getenv(“FLASH_ERASE_SIZE”) > getenv(“FLASH_WRITE_SIZE”)
write_program_eeprom() - Writes 2 bytes, does not erase (use erase_program_eeprom())
write_program_memory() - Writes any number of bytes, will erase a block whenever the first
(lowest) byte in a block is written to. If the first address is not the start of a block that block is
not erased.
erase_program_eeprom() - Will erase a block. The lowest address bits are not used.
For chips where
getenv(“FLASH_ERASE_SIZE”) = getenv(“FLASH_WRITE_SIZE”)
write_program_eeprom() - Writes 2 bytes, no erase is needed.
write_program_memory() - Writes any number of bytes, bytes outside the range of the write
block are not changed. No erase is needed.
erase_program_eeprom() - Not available
270
Built-in Functions
zdc_status( )
Syntax:
value=zcd_status()
Parameters:
Returns:
None
value - the status of the ZCD module. The following defines are made in the device's
header file and are as follows:

ZCD_IS_SINKING

ZCD_IS_SOURCING
Function:
To determine if the Zero-Cross Detection (ZCD) module is currently sinking or sourcing current.
If the ZCD module is setup to have the output polarity inverted, the value return will be reversed.
Availability:
All devices with a ZCD module.
Examples:
Example Files:
value=zcd_status():
Also See:
setup_zcd()
None
271
STANDARD C INCLUDE FILES
errno.h
errno.h
EDOM
ERANGE
errno
Domain error value
Range error value
error value
float.h
float.h
FLT_RADIX:
FLT_MANT_DIG:
FLT_DIG:
FLT_MIN_EXP:
FLT_MIN_10_EXP:
FLT_MAX_EXP:
FLT_MAX_10_EXP:
FLT_MAX:
FLT_EPSILON:
FLT_MIN:
DBL_MANT_DIG:
DBL_DIG:
DBL_MIN_EXP:
DBL_MIN_10_EXP:
DBL_MAX_EXP:
DBL_MAX_10_EXP:
DBL_MAX:
DBL_EPSILON:
DBL_MIN:
LDBL_MANT_DIG:
LDBL_DIG:
Radix of the exponent representation
Number of base digits in the floating point significant
Number of decimal digits, q, such that any floating point number with
q decimal digits can be rounded into a floating point number with p
radix b digits and back again without change to the q decimal digits.
Minimum negative integer such that FLT_RADIX raised to that
power minus 1 is a normalized floating-point number.
Minimum negative integer such that 10 raised to that power is in the
range of normalized floating-point numbers.
Maximum negative integer such that FLT_RADIX raised to that
power minus 1 is a representable finite floating-point number.
Maximum negative integer such that 10 raised to that power is in the
range representable finite floating-point numbers.
Maximum representable finite floating point number.
The difference between 1 and the least value greater than 1 that is
representable in the given floating point type.
Minimum normalized positive floating point number
Number of base digits in the floating point significant
Number of decimal digits, q, such that any floating point number with
q decimal digits can be rounded into a floating point number with p
radix b digits and back again without change to the q decimal digits.
Minimum negative integer such that FLT_RADIX raised to that
power minus 1 is a normalized floating point number.
Minimum negative integer such that 10 raised to that power is in the
range of normalized floating point numbers.
Maximum negative integer such that FLT_RADIX raised to that
power minus 1 is a representable finite floating point number.
Maximum negative integer such that 10 raised to that power is in the
range of representable finite floating point numbers.
Maximum representable finite floating point number.
The difference between 1 and the least value greater than 1 that is
representable in the given floating point type.
Minimum normalized positive floating point number.
Number of base digits in the floating point significant
Number of decimal digits, q, such that any floating point number with
q decimal digits can be rounded into a floating point number with p
radix b digits and back again without change to the q decimal digits.
272
Standard C Include Files
LDBL_MIN_EXP:
LDBL_MIN_10_EXP:
LDBL_MAX_EXP:
LDBL_MAX_10_EXP:
LDBL_MAX:
LDBL_EPSILON:
LDBL_MIN:
Minimum negative integer such that FLT_RADIX raised to that
power minus 1 is a normalized floating-point number.
Minimum negative integer such that 10 raised to that power is in the
range of normalized floating-point numbers.
Maximum negative integer such that FLT_RADIX raised to that
power minus 1 is a representable finite floating-point number.
Maximum negative integer such that 10 raised to that power is in the
range of representable finite floating-point numbers.
Maximum representable finite floating point number.
The difference between 1 and the least value greater than 1 that is
representable in the given floating point type.
Minimum normalized positive floating point number.
limits.h
limits.h
CHAR_BIT:
SCHAR_MIN:
SCHAR_MAX:
UCHAR_MAX:
CHAR_MIN:
CHAR_MAX:
MB_LEN_MAX:
SHRT_MIN:
SHRT_MAX:
USHRT_MAX:
INT_MIN:
INT_MAX:
UINT_MAX:
LONG_MIN:
LONG_MAX:
ULONG_MAX:
Number of bits for the smallest object that is not a bit_field.
Minimum value for an object of type signed char
Maximum value for an object of type signed char
Maximum value for an object of type unsigned char
Minimum value for an object of type char(unsigned)
Maximum value for an object of type char(unsigned)
Maximum number of bytes in a multibyte character.
Minimum value for an object of type short int
Maximum value for an object of type short int
Maximum value for an object of type unsigned short int
Minimum value for an object of type signed int
Maximum value for an object of type signed int
Maximum value for an object of type unsigned int
Minimum value for an object of type signed long int
Maximum value for an object of type signed long int
Maximum value for an object of type unsigned long int
locale.h
locale.h
locale.h
lconv
(Localization not supported)
localization structure
SETLOCALE()
LOCALCONV()
returns null
returns clocale
273
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setjmp.h
setjmp.h
jmp_buf:
setjmp:
longjmp:
An array used by the following functions
Marks a return point for the next longjmp
Jumps to the last marked point
stddef.h
stddef.h
ptrdiff_t:
size_t:
wchar_t
NULL
The basic type of a pointer
The type of the sizeof operator (int)
The type of the largest character set supported (char) (8 bits)
A null pointer (0)
stdio.h
stdio.h
stderr The standard error s stream (USE RS232 specified as stream or the first USE RS232)
stdout The standard output stream (USE RS232 specified as stream last USE RS232)
stdin The standard input s stream (USE RS232 specified as stream last USE RS232)
stdlib.h
stdlib.h
div_t
structure type that contains two signed integers (quot and
rem).
structure type that contains two signed longs (quot and rem
returns 1
returns 0
ldiv_t
EXIT_FAILURE
EXIT_SUCCESS
RAND_MAXMBCUR_MAX1
SYSTEM()
Returns 0( not supported)
Multibyte character and string
Multibyte characters not supported
functions:
MBLEN()
Returns the length of the string.
MBTOWC()
Returns 1.
WCTOMB()
Returns 1.
MBSTOWCS()
Returns length of string.
WBSTOMBS()
Returns length of string.
Stdlib.h functions included just for compliance with ANSI C.
274
ERROR MESSAGES
Compiler Error Messages
# ENDIF with no corresponding #IF
Compiler found a #ENDIF directive without a corresponding #IF.
#ERROR
A #DEVICE required before this line
The compiler requires a #device before it encounters any statement or compiler directive that may cause it to
generate code. In general #defines may appear before a #device but not much more.
ADDRESSMOD function definition is incorrect
ADDRESSMOD range is invalid
A numeric expression must appear here
Some C expression (like 123, A or B+C) must appear at this spot in the code. Some expression that will evaluate to
a value.
Arrays of bits are not permitted
Arrays may not be of SHORT INT. Arrays of Records are permitted but the record size is always rounded up to the
next byte boundary.
Assignment invalid: value is READ ONLY
Attempt to create a pointer to a constant
Constant tables are implemented as functions. Pointers cannot be created to functions. For example CHAR
CONST MSG[9]={"HI THERE"}; is permitted, however you cannot use &MSG. You can only reference MSG with
subscripts such as MSG[i] and in some function calls such as Printf and STRCPY.
Attributes used may only be applied to a function (INLINE or SEPARATE)
An attempt was made to apply #INLINE or #SEPARATE to something other than a function.
Bad ASM syntax
Bad expression syntax
This is a generic error message. It covers all incorrect syntax.
Baud rate out of range
The compiler could not create code for the specified baud rate. If the internal UART is being used the combination of
the clock and the UART capabilities could not get a baud rate within 3% of the requested value. If the built in UART
is not being used then the clock will not permit the indicated baud rate. For fast baud rates, a faster clock will be
required.
BIT variable not permitted here
Addresses cannot be created to bits. For example &X is not permitted if X is a SHORT INT.
Branch out of range
Cannot change device type this far into the code
The #DEVICE is not permitted after code is generated that is device specific. Move the #DEVICE to an area before
code is generated.
Character constant constructed incorrectly
Generally this is due to too many characters within the single quotes. For example 'ab' is an error as is '\nr'. The
backslash is permitted provided the result is a single character such as '\010' or '\n'.
Constant out of the valid range
This will usually occur in inline assembly where a constant must be within a particular range and it is not. For example
BTFSC 3,9 would cause this error since the second operand must be from 0-8.
Data item too big
Define expansion is too large
A fully expanded DEFINE must be less than 255 characters. Check to be sure the DEFINE is not recursively defined.
Define syntax error
This is usually caused by a missing or misplaced (or) within a define.
Demo period has expired
275
CCSC_March 2015-1
Please contact CCS to purchase a licensed copy.
www.ccsinfo.com/pricing
Different levels of indirection
This is caused by a INLINE function with a reference parameter being called with a parameter that is not a variable.
Usually calling with a constant causes this.
Divide by zero
An attempt was made to divide by zero at compile time using constants.
Duplicate case value
Two cases in a switch statement have the same value.
Duplicate DEFAULT statements
The DEFAULT statement within a SWITCH may only appear once in each SWITCH. This error indicates a second
DEFAULT was encountered.
Duplicate function
A function has already been defined with this name. Remember that the compiler is not case sensitive unless a
#CASE is used.
Duplicate Interrupt Procedure
Only one function may be attached to each interrupt level. For example the #INT_RB may only appear once in each
program.
Element is not a member
A field of a record identified by the compiler is not actually in the record. Check the identifier spelling.
ELSE with no corresponding IF
Compiler found an ELSE statement without a corresponding IF. Make sure the ELSE statement always match with
the previous IF statement.
End of file while within define definition
The end of the source file was encountered while still expanding a define. Check for a missing ).
End of source file reached without closing comment */ symbol
The end of the source file has been reached and a comment (started with /*) is still in effect. The */ is missing.
type are INT and CHAR.
Expect ;
Expect }
Expect CASE
Expect comma
Expect WHILE
Expecting *
Expecting :
Expecting <
Expecting =
Expecting >
Expecting a (
Expecting a , or )
Expecting a , or }
Expecting a .
Expecting a ; or ,
Expecting a ; or {
Expecting a close paren
Expecting a declaration
Expecting a structure/union
Expecting a variable
Expecting an =
Expecting a ]
Expecting a {
Expecting an array
Expecting an identifier
Expecting function name
Expecting an opcode mnemonic
This must be a Microchip mnemonic such as MOVLW or BTFSC.
Expecting LVALUE such as a variable name or * expression
This error will occur when a constant is used where a variable should be. For example 4=5; will give this error.
Expecting a basic type
Examples of a basic type are INT and CHAR.
276
Error Messages
Expression must be a constant or simple variable
The indicated expression must evaluate to a constant at compile time. For example 5*3+1 is permitted but 5*x+1
where X is a INT is not permitted. If X were a DEFINE that had a constant value then it is permitted.
Expression must evaluate to a constant
The indicated expression must evaluate to a constant at compile time. For example 5*3+1 is permitted but 5*x+1
where X is a INT is not permitted. If X were a DEFINE that had a constant value then it is permitted.
Expression too complex
This expression has generated too much code for the compiler to handle for a single expression. This is very rare but
if it happens, break the expression up into smaller parts.
Too many assembly lines are being generated for a single C statement. Contact CCS to increase the internal limits.
EXTERNal symbol not found
EXTERNal symbol type mis-match
Extra characters on preprocessor command line
Characters are appearing after a preprocessor directive that do not apply to that directive. Preprocessor commands
own the entire line unlike the normal C syntax. For example the following is an error:
#PRAGMA DEVICE <PIC16C74> main() { int x; x=1;}
File cannot be opened
Check the filename and the current path. The file could not be opened.
File cannot be opened for write
The operating system would not allow the compiler to create one of the output files. Make sure the file is not marked
READ ONLY and that the compiler process has write privileges to the directory and file.
Filename must start with " or <
The correct syntax of a #include is one of the following two formats:
#include "filename.ext"
#include <filename.ext>
This error indicates neither a " or < was found after #include.
Filename must terminate with " or; msg:' '
The filename specified in a #include must terminate with a " if it starts with a ". It must terminate with a > if it starts
with a <.
Floating-point numbers not supported for this operation
A floating-point number is not permitted in the operation near the error. For example, ++F where F is a float is not
allowed.
Function definition different from previous definition
This is a mis-match between a function prototype and a function definition. Be sure that if a #INLINE or #SEPARATE
are used that they appear for both the prototype and definition. These directives are treated much like a type
specifier.
Function used but not defined
The indicated function had a prototype but was never defined in the program.
Identifier is already used in this scope
An attempt was made to define a new identifier that has already been defined.
Illegal C character in input file
A bad character is in the source file. Try deleting the line and re-typing it.
Import error
Improper use of a function identifier
Function identifiers may only be used to call a function. An attempt was made to otherwise reference a function. A
function identifier should have a ( after it.
Incorrectly constructed label
This may be an improperly terminated expression followed by a label. For example:
x=5+
MPLAB:
Initialization of unions is not permitted
Structures can be initialized with an initial value but UNIONS cannot be.
Internal compiler limit reached
The program is using too much of something. An internal compiler limit was reached. Contact CCS and the limit may
be able to be expanded.
Internal Error - Contact CCS
277
CCSC_March 2015-1
This error indicates the compiler detected an internal inconsistency. This is not an error with the source code;
although, something in the source code has triggered the internal error. This problem can usually be quickly
corrected by sending the source files to CCS so the problem can be re-created and corrected.
In the meantime if the error was on a particular line, look for another way to perform the same operation. The error
was probably caused by the syntax of the identified statement. If the error was the last line of the code, the problem
was in linking. Look at the call tree for something out of the ordinary.
Interrupt handler uses too much stack
Too many stack locations are being used by an interrupt handler.
Invalid conversion from LONG INT to INT
In this case, a LONG INT cannot be converted to an INT. You can type cast the LONG INT to perform a truncation.
For example:
I = INT(LI);
Invalid interrupt directive
Invalid parameters to built in function
Built-in shift and rotate functions (such as SHIFT_LEFT) require an expression that evaluates to a constant to specify
the number of bytes.
Invalid Pre-Processor directive
The compiler does not know the preprocessor directive. This is the identifier in one of the following two places:
#xxxxx
#PRAGMA xxxxx
Invalid ORG range
The end address must be greater than or equal to the start address. The range may not overlap another range. The
range may not include locations 0-3. If only one address is specified it must match the start address of a previous
#org.
Invalid overload function
Invalid type conversion
Label not permitted here
Library in USE not found
The identifier after the USE is not one of the pre-defined libraries for the compiler. Check the spelling.
Linker Error: "%s" already defined in "%s"
Linker Error: ("%s'
Linker Error: Canont allocate memory for the section "%s" in the module "%s", because it overlaps with other
sections.
Linker Error: Cannot find unique match for symbol "%s"
Linker Error: Cannot open file "%s"
Linker Error: COFF file "%s" is corrupt; recompile module.
Linker Error: Not enough memory in the target to reallocate the section "%s" in the module "%s".
Linker Error: Section "%s" is found in the modules "%s" and "%s" with different section types.
Linker Error: Unknown error, contact CCS support.
Linker Error: Unresolved external symbol "%s" inside the module "%s".
Linker option no compatible with prior options.
Linker Warning: Section "%s" in module "%s" is declared as shared but there is no shared memory in the target chip.
The shared flag is ignored.
Linker option not compatible with prior options
Conflicting linker options are specified. For example using both the EXCEPT= and ONLY= options in the same
directive is not legal.
LVALUE required
This error will occur when a constant is used where a variable should be. For example 4=5; will give this error.
Macro identifier requires parameters
A #DEFINE identifier is being used but no parameters were specified, as required. For example:
#define min(x,y) ((x<y)?x:y)
When called MIN must have a (--,--) after it such as:
r=min(value, 6);
Macro is defined recursively
A C macro has been defined in such a way as to cause a recursive call to itself.
Missing #ENDIF
A #IF was found without a corresponding #ENDIF.
Missing or invalid .CRG file
The user registration file(s) are not part of the download software. In order for the software to run the files must be in
the same directory as the .EXE files. These files are on the original diskette, CD ROM or e-mail in a non-compressed
278
Error Messages
format. You need only copy them to the .EXE directory. There is one .REG file for each compiler (PCB.REG,
PCM.REG and PCH.REG).
More info:
Must have a #USE DELAY before this #USE
Must have a #USE DELAY before a #USE RS232
The RS232 library uses the DELAY library. You must have a #USE DELAY before you can do a #USE RS232.
No errors
The program has successfully compiled and all requested output files have been created.
No MAIN() function found
All programs are required to have one function with the name main().
No overload function matches
No valid assignment made to function pointer
Not enough RAM for all variables
The program requires more RAM than is available. The symbol map shows variables allocated. The call tree shows
the RAM used by each function. Additional RAM usage can be obtained by breaking larger functions into smaller
ones and splitting the RAM between them.
For example, a function A may perform a series of operations and have 20 local variables declared. Upon analysis, it
may be determined that there are two main parts to the calculations and many variables are not shared between the
parts. A function B may be defined with 7 local variables and a function C may be defined with 7 local variables.
Function A now calls B and C and combines the results and now may only need 6 variables. The savings are
accomplished because B and C are not executing at the same time and the same real memory locations will be used
for their 6 variables (just not at the same time). The compiler will allocate only 13 locations for the group of functions
A, B, C where 20 were required before to perform the same operation.
Number of bits is out of range
For a count of bits, such as in a structure definition, this must be 1-8. For a bit number specification, such as in the
#BIT, the number must be 0-7.
Only integers are supported for this operation
Option invalid
Out of ROM, A segment or the program is too large
A function and all of the INLINE functions it calls must fit into one segment (a hardware code page). For example, on
the PIC16 chip a code page is 512 instructions. If a program has only one function and that function is 600
instructions long, you will get this error even though the chip has plenty of ROM left. The function needs to be split
into at least two smaller functions. Even after this is done, this error may occur since the new function may be only
called once and the linker might automatically INLINE it. This is easily determined by reviewing the call tree. If this
error is caused by too many functions being automatically INLINED by the linker, simply add a #SEPARATE before a
function to force the function to be SEPARATE. Separate functions can be allocated on any page that has room.
The best way to understand the cause of this error is to review the call tree.
Parameters must be located in RAM
Parameters not permitted
An identifier that is not a function or preprocessor macro can not have a ' ( ' after it.
Pointers to bits are not permitted
Addresses cannot be created to bits. For example, &X is not permitted if X is a SHORT INT.
Previous identifier must be a pointer
A -> may only be used after a pointer to a structure. It cannot be used on a structure itself or other kind of variable.
Printf format type is invalid
An unknown character is after the % in a printf. Check the printf reference for valid formats.
Printf format (%) invalid
A bad format combination was used. For example, %lc.
Printf variable count (%) does not match actual count
The number of % format indicators in the printf does not match the actual number of variables that follow.
Remember in order to print a single %, you must use %%.
Recursion not permitted
The linker will not allow recursive function calls. A function may not call itself and it may not call any other function
that will eventually re-call it.
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CCSC_March 2015-1
Recursively defined structures not permitted
A structure may not contain an instance of itself.
Reference arrays are not permitted
A reference parameter may not refer to an array.
Return not allowed in void function
A return statement may not have a value if the function is void.
RTOS call only allowed inside task functions
Selected part does not have ICD debug capability
STDOUT not defined (may be missing #RS 232)
An attempt was made to use a I/O function such as printf when no default I/O stream has been established. Add a
#USE RS232 to define a I/O stream.
Stream must be a constant in the valid range
I/O functions like fputc, fgetc require a stream identifier that was defined in a #USE RS232. This identifier must
appear exactly as it does when it was defined. Be sure it has not been redefined with a #define.
String too long
Structure field name required
A structure is being used in a place where a field of the structure must appear. Change to the form s.f where s is the
structure name and f is a field name.
Structures and UNIONS cannot be parameters (use * or &)
A structure may not be passed by value. Pass a pointer to the structure using &.
Subscript out of range
A subscript to a RAM array must be at least 1 and not more than 128 elements. Note that large arrays might not fit in
a bank. ROM arrays may not occupy more than 256 locations.
This linker function is not available in this compiler version.
Some linker functions are only available if the PCW or PCWH product is installed.
This type cannot be qualified with this qualifier
Check the qualifiers. Be sure to look on previous lines. An example of this error is:
VOID X;
Too many array subscripts
Arrays are limited to 5 dimensions.
Too many constant structures to fit into available space
Available space depends on the chip. Some chips only allow constant structures in certain places. Look at the last
calling tree to evaluate space usage. Constant structures will appear as functions with a @CONST at the beginning
of the name.
Too many elements in an ENUM
A max of 256 elements are allowed in an ENUM.
Too many fast interrupt handlers have been defined
Too many fast interrupt handlers have been identified
Too many nested #INCLUDEs
No more than 10 include files may be open at a time.
Too many parameters
More parameters have been given to a function than the function was defined with.
Too many subscripts
More subscripts have been given to an array than the array was defined with.
Type is not defined
The specified type is used but not defined in the program. Check the spelling.
Type specification not valid for a function
This function has a type specifier that is not meaningful to a function.
Undefined identifier
Undefined label that was used in a GOTO
There was a GOTO LABEL but LABEL was never encountered within the required scope. A GOTO cannot jump
outside a function.
Unknown device type
A #DEVICE contained an unknown device. The center letters of a device are always C regardless of the actual part
in use. For example, use PIC16C74 not PIC16RC74. Be sure the correct compiler is being used for the indicated
device. See #DEVICE for more information.
Unknown keyword in #FUSES
280
Error Messages
Check the keyword spelling against the description under #FUSES.
Unknown linker keyword
The keyword used in a linker directive is not understood.
Unknown type
The specified type is used but not defined in the program. Check the spelling.
User aborted compilation
USE parameter invalid
One of the parameters to a USE library is not valid for the current environment.
USE parameter value is out of range
One of the values for a parameter to the USE library is not valid for the current environment.
Variable never used
Variable of this data type is never greater than this constant
281
COMPILER WARNING MESSAGES
Compiler Warning Messages
#error/warning
Assignment inside relational expression
Although legal it is a common error to do something like if(a=b) when it was intended to do if(a==b).
Assignment to enum is not of the correct type.
This warning indicates there may be such a typo in this line:
Assignment to enum is not of the correct type
If a variable is declared as a ENUM it is best to assign to the variables only elements of the enum. For example:
enum colors {RED,GREEN,BLUE} color;
...
color = GREEN; // OK
color = 1;
// Warning 209
color = (colors)1; //OK
Code has no effect
The compiler can not discern any effect this source code could have on the generated code. Some examples:
1;
a==b;
1,2,3;
Condition always FALSE
This error when it has been determined at compile time that a relational expression will never be true. For example:
int x;
if( x>>9 )
Condition always TRUE
This error when it has been determined at compile time that a relational expression will never be false. For example:
#define PIN_A1 41
...
if( PIN_A1 )
// Intended was: if( input(PIN_A1) )
Function not void and does not return a value
Functions that are declared as returning a value should have a return statement with a value to be returned. Be
aware that in C only functions declared VOID are not intended to return a value. If nothing is specified as a function
return value "int" is assumed.
Duplicate #define
The identifier in the #define has already been used in a previous #define. To redefine an identifier use #UNDEF first.
To prevent defines that may be included from multiple source do something like:
#ifndef ID
#define ID text
#endif
Feature not supported
Function never called
Function not void and does not return a value.
Info:
Interrupt level changed
Interrupts disabled during call to prevent re-entrancy.
Linker Warning: "%s" already defined in object "%s"; second definition ignored.
Linker Warning: Address and size of section "%s" in module "%s" exceeds maximum range for this processor. The
section will be ignored.
282
Compiler Warning Messages
Linker Warning: The module "%s" doesn't have a valid chip id. The module will be considered for the target chip
"%s".
Linker Warning: The target chip "%s" of the imported module "%s" doesn't match the target chip "%s" of the source.
Linker Warning: Unsupported relocation type in module "%s".
Memory not available at requested location.
Operator precedence rules may not be as intended, use() to clarify
Some combinations of operators are confusing to some programmers. This warning is issued for expressions where
adding() would help to clarify the meaning. For example:
if( x << n + 1 )
would be more universally understood when expressed:
if( x << (n + 1) )
Option may be wrong
Structure passed by value
Structures are usually passed by reference to a function. This warning is generated if the structure is being passed
by value. This warning is not generated if the structure is less than 5 bytes. For example:
void myfunct( mystruct s1 ) // Pass by value - Warning
myfunct( s2 );
void myfunct( mystruct * s1 ) // Pass by reference - OK
myfunct( &s2 );
void myfunct( mystruct & s1 ) // Pass by reference - OK
myfunct( s2 );
Undefined identifier
The specified identifier is being used but has never been defined. Check the spelling.
Unprotected call in a #INT_GLOBAL
The interrupt function defined as #INT_GLOBAL is intended to be assembly language or very simple C code. This
error indicates the linker detected code that violated the standard memory allocation scheme. This may be caused
when a C function is called from a #INT_GLOBAL interrupt handler.
Unreachable code
Code included in the program is never executed. For example:
if(n==5)
goto do5;
goto exit;
if(n==20)
// No way to get to this line
return;
Unsigned variable is never less than zero
Unsigned variables are never less than 0. This warning indicates an attempt to check to see if an unsigned variable
is negative. For example the following will not work as intended:
int i;
for(i=10; i>=0; i--)
Variable assignment never used.
Variable of this data type is never greater than this constant
A variable is being compared to a constant. The maximum value of the variable could never be larger than the
constant. For example the following could never be true:
int x; // 8 bits, 0-255
if ( x>300)
Variable never used
A variable has been declared and never referenced in the code.
Variable used before assignment is made.
283
COMMON QUESTIONS & ANSWERS
How are type conversions handled?
The compiler provides automatic type conversions when an assignment is performed. Some information may be lost
if the destination can not properly represent the source. For example: int8var = int16var; Causes the top byte of
int16var to be lost.
Assigning a smaller signed expression to a larger signed variable will result in the sign being maintained. For
example, a signed 8 bit int that is -1 when assigned to a 16 bit signed variable is still -1.
Signed numbers that are negative when assigned to a unsigned number will cause the 2's complement value to be
assigned. For example, assigning -1 to a int8 will result in the int8 being 255. In this case the sign bit is not extended
(conversion to unsigned is done before conversion to more bits). This means the -1 assigned to a 16 bit unsigned is
still 255.
Likewise assigning a large unsigned number to a signed variable of the same size or smaller will result in the value
being distorted. For example, assigning 255 to a signed int8 will result in -1.
The above assignment rules also apply to parameters passed to functions.
When a binary operator has operands of differing types then the lower order operand is converted (using the above
rules) to the higher. The order is as follows:

Float

Signed 32 bit

Unsigned 32 bit

Signed 16 bit

Unsigned 16 bit

Signed 8 bit

Unsigned 8 bit

1 bit
The result is then the same as the operands. Each operator in an expression is evaluated independently. For
example:
i32 = i16 - (i8 + i8)
The + operator is 8 bit, the result is converted to 16 bit after the addition and the - is 16 bit, that result is converted to
32 bit and the assignment is done. Note that if i8 is 200 and i16 is 400 then the result in i32 is 256. (200 plus 200 is
144 with a 8 bit +)
Explicit conversion may be done at any point with (type) inserted before the expression to be converted. For example
in the above the perhaps desired effect may be achieved by doing:
i32 = i16 - ((long)i8 + i8)
In this case the first i8 is converted to 16 bit, then the add is a 16 bit add and the second i8 is forced to 16 bit.
A common C programming error is to do something like:
i16 = i8 * 100;
When the intent was:
i16 = (long) i8 * 100;
284
Common Questions & Answers
Remember that with unsigned ints (the default for this compiler) the values are never negative. For example 2-4 is
254 (in 8 bit). This means the following is an endless loop since i is never less than 0:
int i;
for( i=100; i>=0; i--)
How can a constant data table be placed in ROM?
The compiler has support for placing any data structure into the device ROM as a constant read-only element. Since
the ROM and RAM data paths are separate in the PIC® , there are restrictions on how the data is accessed. For
example, to place a 10 element BYTE array in ROM use:
BYTE CONST TABLE [10]= {9,8,7,6,5,4,3,2,1,0};
and to access the table use:
x = TABLE [i];
OR
x = TABLE [5];
BUT NOT
ptr = &TABLE [i];
In this case, a pointer to the table cannot be constructed.
Similar constructs using CONST may be used with any data type including structures, longs and floats.
Note that in the implementation of the above table, a function call is made when a table is accessed with a subscript
that cannot be evaluated at compile time.
How can I use two or more RS-232 ports on one PIC®?
The #USE RS232 (and I2C for that matter) is in effect for GETC, PUTC, PRINTF and KBHIT functions encountered
until another #USE RS232 is found.
The #USE RS232 is not an executable line. It works much like a #DEFINE.
The following is an example program to read from one RS-232 port (A) and echo the data to both the first RS-232
port (A) and a second RS-232 port (B).
#USE RS232(BAUD=9600, XMIT=PIN_B0, RCV=PIN_B1)
void put_to_a( char c ) {
put(c);
}
char get_from_a( ) {
return(getc()); }
#USE RS232(BAUD=9600, XMIT=PIN_B2,RCV=PIN_B3)
void put_to_b( char b ) {
putc(c);
}
main() {
char c;
put_to_a("Online\n\r");
put_to_b("Online\n\r");
while(TRUE) {
c=get_from_a();
285
CCSC_March 2015-1
put_to_b(c);
put_to_a(c);
}
}
The following will do the same thing but is more readable and is the recommended method:
#USE RS232(BAUD=9600, XMIT=PIN_B0, RCV=PIN_B1, STREAM=COM_A)
#USE RS232(BAUD=9600, XMIT=PIN_B2, RCV=PIN_B3, STREAM=COM_B)
main() {
char c;
fprintf(COM_A,"Online\n\r");
fprintf(COM_B,"Online\n\r");
while(TRUE) {
c = fgetc(COM_A);
fputc(c, COM_A);
fputc(c, COM_B);
}
}
How can the RB interrupt be used to detect a button press?
The RB interrupt will happen when there is any change (input or output) on pins B4-B7. There is only one interrupt
and the PIC® does not tell you which pin changed. The programmer must determine the change based on the
previously known value of the port. Furthermore, a single button press may cause several interrupts due to bounce in
the switch. A debounce algorithm will need to be used. The following is a simple example:
#int_rb
rb_isr() {
byte changes;
changes = last_b ^ port_b;
last_b = port_b;
if (bit_test(changes,4 )&& !bit_test(last_b,4)){
//b4 went low
}
if (bit_test(changes,5)&& !bit_test (last_b,5)){
//b5 went low
}
.
.
.
delay_ms (100); //debounce
}
The delay=ms (100) is a quick and dirty debounce. In general, you will not want to sit in an ISR for 100 MS to allow
the switch to debounce. A more elegant solution is to set a timer on the first interrupt and wait until the timer
overflows. Do not process further changes on the pin.
How do I directly read/write to internal registers?
A hardware register may be mapped to a C variable to allow direct read and write capability to the register. The
following is an example using the TIMER0 register:
#BYTE timer 0 = 0x 01
timer0= 128; //set timer0 to 128
while (timer 0 ! = 200); // wait for timer0 to reach 200
Bits in registers may also be mapped as follows:
286
Common Questions & Answers
#BIT T 0 IF = 0x 0B.2
.
.
.
while (!T 0 IF); //wait for timer0 interrupt
Registers may be indirectly addressed as shown in the following example:
printf ("enter address:");
a = gethex ();
printf ("\r\n value is %x\r\n", *a);
The compiler has a large set of built-in functions that will allow one to perform the most common tasks with C function
calls. When possible, it is best to use the built-in functions rather than directly write to registers. Register locations
change between chips and some register operations require a specific algorithm to be performed when a register
value is changed. The compiler also takes into account known chip errata in the implementation of the built-in
functions. For example, it is better to do set_tris_ A (0); rather than *0x 85 =0;
How do I do a printf to a string?
The following is an example of how to direct the output of a printf to a string. We used the \f to indicate the start of the
string.
This example shows how to put a floating point number in a string.
main() {
char string[20];
float f;
f=12.345;
sprintf(string,"\f%6.3f",f);
}
How do I get getc() to timeout after a specified time?
GETC will always wait for a character to become available unless a timeout time is specified in the #use rs232().
The following is an example of how to setup the PIC to timeout when waiting for an RS232 character.
#include <18F4520.h>
#fuses HS,NOWDT
#use delay(clock=20MHz)
#use rs232(UART1,baud=9600,timeout=500) //timeout = 500 milliseconds, 1/2 second
void main()
{
char c;
while(TRUE)
{
c=getc();
//if getc() timeouts 0 is returned to c
//otherwise receive character is returned to c
if(c) //if not zero echo character back
putc(c);
//user to do code
output_toggle(PIN_A5);
}
}
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CCSC_March 2015-1
How do I put a NOP at location 0 for the ICD?
The CCS compilers are fully compatible with Microchips ICD debugger using MPLAB. In order to prepare a program
for ICD debugging (NOP at location 0 and so on) you need to add a #DEVICE ICD=TRUE after your normal
#DEVICE.
For example:
#INCLUDE <16F877.h>
#DEVICE ICD=TRUE
How do I wait only a specified time for a button press?
The following is an example of how to wait only a specific time for a button press.
#define PUSH_BUTTON PIN_A4
int1 timeout_error;
int1 timed_get_button_press(void){
int16 timeout;
timeout_error=FALSE;
timeout=0;
while(input(PUSH_BUTTON) && (++timeout<50000)) // 1/2 second
delay_us(10);
if(!input(PUSH_BUTTON))
return(TRUE); //button pressed
else{
timeout_error=TRUE;
return(FALSE); //button not pressed timeout occurred
}
}
How do I write variables to EEPROM that are not a byte?
The following is an example of how to read and write a floating point number from/to EEPROM. The same concept
may be used for structures, arrays or any other type.



n is an offset into the EEPROM.
For floats you must increment it by 4.
For example, if the first float is at 0, the second one should be at 4, and the third at 8.
WRITE_FLOAT_EXT_EEPROM( long int n, float data) {
int i;
for (i = 0; i < 4 ; i++)
write_ ext_ eeprom(i + n, *(((int 8 *)&data + i) ) ;
}
float READ_FLOAT_EXT_EEPROM( long int n) {
int i;
float data;
for (i = 0; i < 4; i++)
*(((int 8 *)&data) + i) = read_ ext_ eeprom(i + n);
return(data);
}
288
Common Questions & Answers
How does one map a variable to an I/O port?
Two methods are as follows:
#byte
PORTB =
6
#define ALL_OUT 0
#define ALL_IN 0xff
main() {
int i;
//Just an example, check the
//DATA sheet for the correct
//address for your chip
set_tris_b(ALL_OUT);
PORTB = 0;// Set all pins low
for(i=0;i<=127;++i)
// Quickly count from 0 to 127
PORTB=i;
// on the I/O port pin
set_tris_b(ALL_IN);
i = PORTB;
// i now contains the portb value.
}
Remember when using the #BYTE, the created variable is treated like memory. You must maintain the tri-state
control registers yourself via the SET_TRIS_X function. Following is an example of placing a structure on an I/O port:
struct
port_b_layout
{int data : 4;
int rw : 1;
int cd : 1;
int enable : 1;
int reset : 1; };
struct
port_b_layout port_b;
#byte port_b = 6
struct port_b_layout const INIT_1 = {0, 1,1, 1,1 };
struct port_b_layout const INIT_2 = {3, 1,1, 1,0 };
struct port_b_layout const INIT_3 = {0, 0,0, 0,0 };
struct port_b_layout const FOR_SEND = {0,0,0, 0,0 };
// All outputs
struct
port_b_layout const FOR_READ = {15,0,0, 0,0 };
// Data is an input
main() {
int x;
set_tris_b((int)FOR_SEND);
// The constant
// structure is
// treated like
// a byte and
// is used to
// set the data
// direction
port_b = INIT_1;
delay_us(25);
port_b = INIT_2;
port_b = INIT_3;
//
//
//
//
These constant structures delay_us(25);
are used to set all fields
on the port with a single
command
set_tris_b((int)FOR_READ);
port_b.rw=0;
port_b.cd=1;
port_b.enable=0;
x = port_b.data;
port_b.enable=0
// Here the individual
// fields are accessed
// independently.
}
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CCSC_March 2015-1
How does the compiler determine TRUE and FALSE on
expressions?
When relational expressions are assigned to variables, the result is always 0 or 1.
For example:
bytevar = 5>0;
bytevar = 0>5;
//bytevar will be 1
//bytevar will be 0
The same is true when relational operators are used in expressions.
For example:
bytevar = (x>y)*4;
is the same as:
if( x>y )
bytevar=4;
else
bytevar=0;
SHORT INTs (bit variables) are treated the same as relational expressions. They evaluate to 0 or 1.
When expressions are converted to relational expressions or SHORT INTs, the result will be FALSE (or 0) when the
expression is 0, otherwise the result is TRUE (or 1).
For example:
bytevar = 54;
bitvar = bytevar;
if(bytevar)
bytevar = 0;
bitvar = bytevar;
//bitvar will be 1 (bytevar ! = O)
//will be TRUE
//bitvar will be 0
How does the PIC® connect to a PC?
A level converter should be used to convert the TTL (0-5V_ levels that the PIC® operates with to the RS-232 voltages
(+/- 3-12V) used by the PIC®. The following is a popular configuration using the MAX232 chip as a level converter.
How does the PIC® connect to an I2C device?
Two I/O lines are required for I2C. Both lines must have pullup registers. Often the I2C device will have a H/W
selectable address. The address set must match the address in S/W. The example programs all assume the
selectable address lines are grounded.
290
Common Questions & Answers
How much time do math operations take?
Unsigned 8 bit operations are quite fast and floating point is very slow. If possible consider fixed point instead of
floating point. For example instead of "float cost_in_dollars;" do "long cost_in_cents;". For trig formulas consider a
lookup table instead of real time calculations (see EX_SINE.C for an example). The following are some rough times
on a 14-bit PIC®. Note times will vary depending on memory banks used.
20 mhz PIC16
+
*
/
exp()
ln()
sin()
int8 [us]
int16 [us]
0.6
0.6
11.1
23.2
*
*
*
1.4
1.4
47.2
70.8
*
*
*
int32
[us]
3
3
132
239.2
*
*
*
float
[us]
111.
113.
178.
330.
1697.3
2017.7
2184.5
40 mhz PIC18
int8 [us]
0.3
0.3
0.4
11.3
*
*
*
+
*
/
exp()
ln()
sin()
int16 [us]
0.4
0.4
3.2
32
*
*
*
int32 [us]
0.6
0.6
22.2
106.6
*
*
*
float [us]
51.3
52.3
35.8
144.9
510.4
644.8
698.7
Instead of 800, the compiler calls 0. Why?
The PIC® ROM address field in opcodes is 8-10 Bits depending on the chip and specific opcode. The rest of the
address bits come from other sources. For example, on the 174 chip to call address 800 from code in the first page
you will see:
BSF
CALL
0A,3
0
The call 0 is actually 800H since Bit 11 of the address (Bit 3 of PCLATH, Reg 0A) has been set.
Instead of A0, the compiler is using register 20. Why?
The PIC® RAM address field in opcodes is 5-7 bits long, depending on the chip. The rest of the address field comes
from the status register. For example, on the 74 chip to load A0 into W you will see:
BSF 3,5
MOVFW
20
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CCSC_March 2015-1
Note that the BSF may not be immediately before the access since the compiler optimizes out the redundant bank
switches.
What can be done about an OUT OF RAM error?
The compiler makes every effort to optimize usage of RAM. Understanding the RAM allocation can be a help in
designing the program structure. The best re-use of RAM is accomplished when local variables are used with lots of
functions. RAM is re-used between functions not active at the same time. See the NOT ENOUGH RAM error
message in this manual for a more detailed example.
RAM is also used for expression evaluation when the expression is complex. The more complex the expression, the
more scratch RAM locations the compiler will need to allocate to that expression. The RAM allocated is reserved
during the execution of the entire function but may be re-used between expressions within the function. The total
RAM required for a function is the sum of the parameters, the local variables and the largest number of scratch
locations required for any expression within the function. The RAM required for a function is shown in the call tree
after the RAM=. The RAM stays used when the function calls another function and new RAM is allocated for the new
function. However when a function RETURNS the RAM may be re-used by another function called by the parent.
Sequential calls to functions each with their own local variables is very efficient use of RAM as opposed to a large
function with local variables declared for the entire process at once.
Be sure to use SHORT INT (1 bit) variables whenever possible for flags and other boolean variables. The compiler
can pack eight such variables into one byte location. The compiler does this automatically whenever you use SHORT
INT. The code size and ROM size will be smaller.
Finally, consider an external memory device to hold data not required frequently. An external 8 pin EEPROM or
SRAM can be connected to the PIC® with just 2 wires and provide a great deal of additional storage capability. The
compiler package includes example drivers for these devices. The primary drawback is a slower access time to read
and write the data. The SRAM will have fast read and write with memory being lost when power fails. The EEPROM
will have a very long write cycle, but can retain the data when power is lost.
What is an easy way for two or more PICs® to communicate?
There are two example programs (EX_PBUSM.C and EX_PBUSR.C) that show how to use a simple one-wire
interface to transfer data between PICs®. Slower data can use pin B0 and the EXT interrupt. The built-in UART may
be used for high speed transfers. An RS232 driver chip may be used for long distance operations. The RS485 as well
as the high speed UART require 2 pins and minor software changes. The following are some hardware
configurations.
What is an easy way for two or more PICs® to communicate?
There are two example programs (EX_PBUSM.C and EX_PBUSR.C) that show how to use a simple
one-wire interface to transfer data between PICs®. Slower data can use pin B0 and the EXT interrupt.
The built-in UART may be used for high speed transfers. An RS232 driver chip may be used for long
distance operations. The RS485 as well as the high speed UART require 2 pins and minor software
changes. The following are some hardware configurations.
292
Common Questions & Answers
What is the format of floating point numbers?
CCS uses the same format Microchip uses in the 14000 calibration constants. PCW users have a utility Numeric
Converter that will provide easy conversion to/from decimal, hex and float in a small window in the Windows IDE. See
EX_FLOAT.C for a good example of using floats or float types variables. The format is as follows:
Example Number
0
1
-1
10
100
123.45
123.45E20
123.45 E-20
00
7F
7F
82
85
85
C8
43
00
00
80
20
48
76
27
36
00
00
00
00
00
E6
4E
2E
00
00
00
00
00
66
53
17
Why does the .LST file look out of order?
The list file is produced to show the assembly code created for the C source code. Each C source line has the
corresponding assembly lines under it to show the compiler’s work. The following three special cases make the .LST
file look strange to the first time viewer. Understanding how the compiler is working in these special cases will make
the .LST file appear quite normal and very useful.
1. Stray code near the top of the program is sometimes under what looks like a non-executable source line.
Some of the code generated by the compiler does not correspond to any particular source line. The compiler will put
this code either near the top of the program or sometimes under a #USE that caused subroutines to be generated.
2. The addresses are out of order.
The compiler will create the .LST file in the order of the C source code. The linker has re-arranged the code to
properly fit the functions into the best code pages and the best half of a code page. The resulting code is not in
source order. Whenever the compiler has a discontinuity in the .LST file, it will put a * line in the file. This is most
often seen between functions and in places where INLINE functions are called. In the case of an INLINE function, the
addresses will continue in order up where the source for the INLINE function is located.
3. The compiler has gone insane and generated the same instruction over and over.
For example:
...........A=0;
03F:
CLRF 15
*
46:CLRF 15
*
051:
CLRF 15
*
113:
CLRF 15
This effect is seen when the function is an INLINE function and is called from more than one place. In the above
case, the A=0 line is in an INLINE function called in four places. Each place it is called from gets a new copy of the
code. Each instance of the code is shown along with the original source line, and the result may look unusual until the
addresses and the * are noticed.
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CCSC_March 2015-1
Why does the compiler show less RAM than there really is?
Some devices make part of the RAM much more ineffective to access than the standard RAM. In particular, the 509,
57, 66, 67,76 and 77 devices have this problem.
By default, the compiler will not automatically allocate variables to the problem RAM and, therefore, the RAM
available will show a number smaller than expected.
There are three ways to use this RAM:
1. Use #BYTE or #BIT to allocate a variable in this RAM. Do NOT create a pointer to these variables.
Example:
#BYTE counter=0x30
2. Use Read_Bank and Write_Bank to access the RAM like an array. This works well if you need to allocate an array
in this RAM.
Example:
For(i=0;i<15;i++)
Write_Bank(1,i,getc());
For(i=0;i<=15;i++)
PUTC(Read_Bank(1,i));
3. You can switch to larger pointers for full RAM access (this takes more ROM). In PCB add *=8 to the #device and in
PCM/PCH add *=16 to the #device.
Example:
#DEVICE PIC16C77
*=16
or
#include <16C77.h>
#device *=16
Why does the compiler use the obsolete TRIS?
The use of TRIS causes concern for some users. The Microchip data sheets recommend not using TRIS instructions
for upward compatibility. If you had existing ASM code and it used TRIS then it would be more difficult to port to a
new Microchip part without TRIS. C does not have this problem, however; the compiler has a device database that
indicates specific characteristics for every part. This includes information on whether the part has a TRIS and a list of
known problems with the part. The latter question is answered by looking at the device errata.
CCS makes every attempt to add new devices and device revisions as the data and errata sheets become available.
PCW users can edit the device database. If the use of TRIS is a concern, simply change the database entry for your
part and the compiler will not use it.
Why is the RS-232 not working right?
1. The PIC® is Sending Garbage Characters.
A. Check the clock on the target for accuracy. Crystals are usually not a problem but RC oscillators can cause
trouble with RS-232. Make sure the #USE DELAY matches the actual clock frequency.
294
Common Questions & Answers
B. Make sure the PC (or other host) has the correct baud and parity setting.
C. Check the level conversion. When using a driver/receiver chip, such as the MAX 232, do not use INVERT
when making direct connections with resistors and/or diodes. You probably need the INVERT option in the
#USE RS232.
D. Remember that PUTC(6) will send an ASCII 6 to the PC and this may not be a visible character. PUTC('A')
will output a visible character A.
2. The PIC® is Receiving Garbage Characters.
A. Check all of the above.
3. Nothing is Being Sent.
A. Make sure that the tri-state registers are correct. The mode (standard, fast, fixed) used will be whatever the
mode is when the #USE RS232 is encountered. Staying with the default STANDARD mode is safest.
B. Use the following main() for testing:
main() {
while(TRUE)
putc('U');
}
Check the XMIT pin for activity with a logic probe, scope or whatever you can. If you can look at it with a
scope, check the bit time (it should be 1/BAUD). Check again after the level converter.
4. Nothing is being received.
First be sure the PIC® can send data. Use the following main() for testing:
main() {
printf("start");
while(TRUE)
putc( getc()+1 );
}
When connected to a PC typing A should show B echoed back.
If nothing is seen coming back (except the initial "Start"), check the RCV pin on the PIC® with a logic
probe. You should see a HIGH state and when a key is pressed at the PC, a pulse to low. Trace back to find
out where it is lost.
5. The PIC® is always receiving data via RS-232 even when none is being sent.
A. Check that the INVERT option in the USE RS232 is right for your level converter. If the RCV pin is HIGH
when no data is being sent, you should NOT use INVERT. If the pin is low when no data is being sent, you
need to use INVERT.
B. Check that the pin is stable at HIGH or LOW in accordance with A above when no data is being sent.
C. When using PORT A with a device that supports the SETUP_ADC_PORTS function make sure the port is
set to digital inputs. This is not the default. The same is true for devices with a comparator on PORT A.
6. Compiler reports INVALID BAUD RATE.
A. When using a software RS232 (no built-in UART), the clock cannot be really slow when fast baud rates
are used and cannot be really fast with slow baud rates. Experiment with the clock/baud rate values to find
your limits.
B. When using the built-in UART, the requested baud rate must be within 3% of a rate that can be achieved
for no error to occur. Some parts have internal bugs with BRGH set to 1 and the compiler will not use this
unless you specify BRGH1OK in the #USE RS232 directive.
295
CCSC_March 2015-1
296
EXAMPLE PROGRAMS
EXAMPLE PROGRAMS
A large number of example programs are included with the software. The following is a list of many of the programs
and some of the key programs are re-printed on the following pages. Most programs will work with any chip by just
changing the #INCLUDE line that includes the device information. All of the following programs have wiring
instructions at the beginning of the code in a comment header. The SIOW.EXE program included in the program
directory may be used to demonstrate the example programs. This program will use a PC COM port to communicate
with the target.
Generic header files are included for the standard PIC® parts. These files are in the DEVICES directory. The pins of
the chip are defined in these files in the form PIN_B2. It is recommended that for a given project, the file is copied to a
project header file and the PIN_xx defines be changed to match the actual hardware. For example; LCDRW
(matching the mnemonic on the schematic). Use the generic include files by placing the following in your main .C file:
#include <16C74.H>
LIST OF COMPLETE EXAMPLE PROGRAMS (in the EXAMPLES directory)
EX_14KAD.C
An analog to digital program with calibration for the PIC14000
EX_1920.C
Uses a Dallas DS1920 button to read temperature
EX_8PIN.C
Demonstrates the use of 8 pin PICs with their special I/O requirements
EX_92LCD.C
Uses a PIC16C92x chip to directly drive LCD glass
EX_AD12.C
Shows how to use an external 12 bit A/D converter
EX_ADMM.C
A/D Conversion example showing min and max analog readings
EX_ADMM10.C
Similar to ex_admm.c, but this uses 10bit A/D readings.
EX_ADMM_STATS.C
Similar to ex_admm.c, but this uses also calculates the mean and standard deviation.
EX_BOOTLOAD.C
A stand-alone application that needs to be loaded by a bootloader (see ex_bootloader.c for a bootloader).
EX_BOOTLOADER.C
A bootloader, loads an application onto the PIC (see ex_bootload.c for an application).
EX_CAN.C
Receive and transmit CAN packets.
EX_CHECKSUM.C
Determines the checksum of the program memory, verifies it agains the checksum that was written to the USER ID
location of the PIC.
297
CCSC_March 2015-1
EX_CCP1S.C
Generates a precision pulse using the PIC CCP module
EX_CCPMP.C
Uses the PIC CCP module to measure a pulse width
EX_COMP.C
Uses the analog comparator and voltage reference available on some PIC s
EX_CRC.C
Calculates CRC on a message showing the fast and powerful bit operations
EX_CUST.C
Change the nature of the compiler using special preprocessor directives
EX_FIXED.C
Shows fixed point numbers
EX_DPOT.C
Controls an external digital POT
EX_DTMF.C
Generates DTMF tones
EX_ENCOD.C
Interfaces to an optical encoder to determine direction and speed
EX_EXPIO.C
Uses simple logic chips to add I/O ports to the PIC
EX_EXSIO.C
Shows how to use a multi-port external UART chip
EX_EXTEE.C
Reads and writes to an external EEPROM
EX_EXTDYNMEM.C
Uses addressmod to create a user defined storage space, where a new qualifier is created that reads/writes to an
extrenal RAM device.
EX_FAT.C
An example of reading and writing to a FAT file system on an MMC/SD card.
EX_FLOAT.C
Shows how to use basic floating point
EX_FREQC.C
A 50 mhz frequency counter
EX_GLCD.C
Displays contents on a graphic LCD, includes shapes and text.
EX_GLINT.C
Shows how to define a custom global interrupt hander for fast interrupts
EX_HPINT.C
An example of how to use the high priority interrupts of a PIC18.
EX_HUMIDITY.C
How to read the humidity from a Humirel HT3223/HTF3223 Humidity module
298
Example Programs
EX_ICD.C
Shows a simple program for use with Microchips ICD debugger
EX_INTEE.C
Reads and writes to the PIC internal EEPROM
EX_INTFL.C
An example of how to write to the program memory of the PIC.
EX_LCDKB.C
Displays data to an LCD module and reads data for keypad
EX_LCDTH.C
Shows current, min and max temperature on an LCD
EX_LED.C
Drives a two digit 7 segment LED
EX_LINBUS_MASTER.C
An example of how to use the LINBUS mode of a PIC's EAUSART. Talks to the EX_LINBUS_SLAVE.C example.
EX_LINBUS_SLAVE.C
An example of how to use the LINBUS mode of a PIC's EAUSART. Talks to the EX_LINBUS_MASTER.C example.
EX_LOAD.C
Serial boot loader program for chips like the 16F877
EX_LOGGER.C
A simple temperature data logger, uses the flash program memory for saving data
EX_MACRO.C
Shows how powerful advanced macros can be in C
EX_MALLOC.C
An example of dynamic memory allocation using malloc().
EX_MCR.C
An example of reading magnetic card readers.
EX_MMCSD.C
An example of using an MMC/SD media card as an external EEPROM. To use this card with a FAT file system, see
ex_fat.c
EX_MODBUS_MASTER.C
An example MODBUS application, this is a master and will talk to the ex_modbus_slave.c example.
EX_MODBUS_SLAVE.C
An example MODBUS application, this is a slave and will talk to the ex_modbus_master.c example.
EX_MOUSE.C
Shows how to implement a standard PC mouse on a PIC
EX_MXRAM.C
Shows how to use all the RAM on parts with problem memory allocation
EX_PATG.C
Generates 8 square waves of different frequencies
EX_PBUSM.C
Generic PIC to PIC message transfer program over one wire
EX_PBUSR.C
299
CCSC_March 2015-1
Implements a PIC to PIC shared RAM over one wire
EX_PBUTT.C
Shows how to use the B port change interrupt to detect pushbuttons
EX_PGEN.C
Generates pulses with period and duty switch selectable
EX_PLL.C
Interfaces to an external frequency synthesizer to tune a radio
EX_POWER_PWM.C
How to use the enhanced PWM module of the PIC18 for motor controls.
EX_PSP.C
Uses the PIC PSP to implement a printer parallel to serial converter
EX_PULSE.C
Measures a pulse width using timer0
EX_PWM.C
Uses the PIC CCP module to generate a pulse stream
EX_QSORT.C
An example of using the stdlib function qsort() to sort data. Pointers to functions is used by qsort() so the user can
specify their sort algorithm.
EX_REACT.C
Times the reaction time of a relay closing using the CCP module
EX_RFID.C
An example of how to read the ID from a 125kHz RFID transponder tag.
EX_RMSDB.C
Calculates the RMS voltage and dB level of an AC signal
EX_RS485.C
An application that shows a multi-node communication protocol commonly found on RS-485 busses.
EX_RTC.C
Sets and reads an external Real Time Clock using RS232
EX_RTCLK.C
Sets and reads an external Real Time Clock using an LCD and keypad
EX_RTCTIMER.C
How to use the PIC's hardware timer as a real time clock.
EX_RTOS_DEMO_X.C
9 examples are provided that show how to use CCS's built-in RTOS (Real Time Operating System).
EX_SINE.C
Generates a sine wave using a D/A converter
EX_SISR.C
Shows how to do RS232 serial interrupts
EX_STISR.C
Shows how to do RS232 transmit buffering with interrupts
EX_SLAVE.C
Simulates an I2C serial EEPROM showing the PIC slave mode
300
Example Programs
EX_SPEED.C
Calculates the speed of an external object like a model car
EX_SPI.C
Communicates with a serial EEPROM using the H/W SPI module
EX_SPI_SLAVE.C
How to use the PIC's MSSP peripheral as a SPI slave. This example will talk to the ex_spi.c example.
EX_SQW.C
Simple Square wave generator
EX_SRAM.C
Reads and writes to an external serial RAM
EX_STEP.C
Drives a stepper motor via RS232 commands and an analog input
EX_STR.C
Shows how to use basic C string handling functions
EX_STWT.C
A stop Watch program that shows how to user a timer interrupt
EX_SYNC_MASTER.C
EX_SYNC_SLAVE.C
An example of using the USART of the PIC in synchronous mode. The master and slave examples talk to each
other.
EX_TANK.C
Uses trig functions to calculate the liquid in a odd shaped tank
EX_TEMP.C
Displays (via RS232) the temperature from a digital sensor
EX_TGETC.C
Demonstrates how to timeout of waiting for RS232 data
EX_TONES.C
Shows how to generate tones by playing "Happy Birthday"
EX_TOUCH.C
Reads the serial number from a Dallas touch device
EX_USB_HID.C
Implements a USB HID device on the PIC16C765 or an external USB chip
EX_USB_SCOPE.C
Implements a USB bulk mode transfer for a simple oscilloscope on an ext USB chip
EX_USB_KBMOUSE.C
EX_USB_KBMOUSE2.C
Examples of how to implement 2 USB HID devices on the same device, by combining a mouse and keyboard.
EX_USB_SERIAL.C
EX_USB_SERIAL2.C
Examples of using the CDC USB class to create a virtual COM port for backwards compatability with legacy software.
EX_VOICE.C
Self learning text to voice program
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CCSC_March 2015-1
EX_WAKUP.C
Shows how to put a chip into sleep mode and wake it up
EX_WDT.C
Shows how to use the PIC watch dog timer
EX_WDT18.C
Shows how to use the PIC18 watch dog timer
EX_X10.C
Communicates with a TW523 unit to read and send power line X10 codes
EX_EXTA.C
The XTEA encryption cipher is used to create an encrypted link between two PICs.
LIST OF INCLUDE FILES (in the DRIVERS directory)
14KCAL.C
Calibration functions for the PIC14000 A/D converter
2401.C
Serial EEPROM functions
2402.C
Serial EEPROM functions
2404.C
Serial EEPROM functions
2408.C
Serial EEPROM functions
24128.C
Serial EEPROM functions
2416.C
Serial EEPROM functions
24256.C
Serial EEPROM functions
2432.C
Serial EEPROM functions
2465.C
Serial EEPROM functions
25160.C
Serial EEPROM functions
25320.C
Serial EEPROM functions
25640.C
Serial EEPROM functions
25C080.C
Serial EEPROM functions
68HC68R1
C Serial RAM functions
302
Example Programs
68HC68R2.C
Serial RAM functions
74165.C
Expanded input functions
74595.C
Expanded output functions
9346.C
Serial EEPROM functions
9356.C
Serial EEPROM functions
9356SPI.C
Serial EEPROM functions (uses H/W SPI)
9366.C
Serial EEPROM functions
AD7705.C
A/D Converter functions
AD7715.C
A/D Converter functions
AD8400.C
Digital POT functions
ADS8320.C
A/D Converter functions
ASSERT.H
Standard C error reporting
AT25256.C
Serial EEPROM functions
AT29C1024.C
Flash drivers for an external memory chip
CRC.C
CRC calculation functions
CE51X.C
Functions to access the 12CE51x EEPROM
CE62X.C
Functions to access the 12CE62x EEPROM
CE67X.C
Functions to access the 12CE67x EEPROM
CTYPE.H
Definitions for various character handling functions
DS1302.C
Real time clock functions
DS1621.C
Temperature functions
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CCSC_March 2015-1
DS1621M.C
Temperature functions for multiple DS1621 devices on the same bus
DS1631.C
Temperature functions
DS1624.C
Temperature functions
DS1868.C
Digital POT functions
ERRNO.H
Standard C error handling for math errors
FLOAT.H
Standard C float constants
FLOATEE.C
Functions to read/write floats to an EEPROM
INPUT.C
Functions to read strings and numbers via RS232
ISD4003.C
Functions for the ISD4003 voice record/playback chip
KBD.C
Functions to read a keypad
LCD.C
LCD module functions
LIMITS.H
Standard C definitions for numeric limits
LMX2326.C
PLL functions
LOADER.C
A simple RS232 program loader
LOCALE.H
Standard C functions for local language support
LTC1298.C
12 Bit A/D converter functions
MATH.H
Various standard trig functions
MAX517.C
D/A converter functions
MCP3208.C
A/D converter functions
NJU6355.C
Real time clock functions
PCF8570.C
304
Example Programs
Serial RAM functions
PIC_USB.H
Hardware layer for built-in PIC USB
SC28L19X.C
Driver for the Phillips external UART (4 or 8 port)
SETJMP.H
Standard C functions for doing jumps outside functions
STDDEF.H
Standard C definitions
STDIO.H
Not much here - Provided for standard C compatibility
STDLIB.H
String to number functions
STDLIBM.H
Standard C memory management functions
STRING.H
Various standard string functions
TONES.C
Functions to generate tones
TOUCH.C
Functions to read/write to Dallas touch devices
USB.H
Standard USB request and token handler code
USBN960X.C
Functions to interface to Nationals USBN960x USB chips
USB.C
USB token and request handler code, Also includes usb_desc.h and usb.h
X10.C
Functions to read/write X10 codes
/////////////////////////////////////////////////////////////////
///
EX_SQW.C
///
///
This program displays a message over the RS-232 and
///
///
waits for any keypress to continue. The program
///
///
will then begin a 1khz square wave over I/O pin B0.
///
///
Change both delay_us to delay_ms to make the
///
///
frequency 1 hz. This will be more visible on
///
///
a LED. Configure the CCS prototype card as follows:
///
///
insert jumpers from 11 to 17, 12 to 18, and 42 to 47.
///
/////////////////////////////////////////////////////////////////
#ifdef __PCB__
#include <16C56.H>
#else
#include <16C84.H>
#endif
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)
main()
{
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CCSC_March 2015-1
printf("Press any key to begin\n\r");
getc();
printf("1 khz signal activated\n\r");
while (TRUE) {
output_high (PIN_B0);
delay_us(500);
output_low(PIN_B0);
delay_us(500);
}
}
/////////////////////////////////////////////////////////////////
///
EX_STWT.C
///
///
This program uses the RTCC (timer0) and interrupts
///
///
to keep a real time seconds counter. A simple stop
///
///
watch function is then implemented. Configure the
///
///
CCS prototype card as follows, insert jumpers from:
///
///
11 to 17 and 12 to 18.
///
/////////////////////////////////////////////////////////////////
#include <16C84.H>
#use delay (clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2_
#define INTS_PER_SECOND 76
//(20000000/(4*256*256))
byte seconds;
//Number of interrupts left
//before a second has elapsed
#int_rtcc
clock_isr() {
//This function is called
//every time the RTCC (timer0)
//overflows (255->0)
//For this program this is apx
//76 times per second.
if(--int_count==0) {
++seconds;
int_count=INTS_PER_SECOND;
}
}
main() {
byte start;
int_count=INTS_PER_SECOND;
set_rtcc(0);
setup_counters (RTCC_INTERNAL, RTCC_DIV_256);
enable_interrupts (INT_RTCC);
enable_interrupts(GLOBAL)
do {
printf ("Press any key to begin. \n\r");
getc();
start=seconds;
printf("Press any key to stop. \n\r");
getc();
printf ("%u seconds. \n\r", seconds-start);
} while (TRUE);
}
/////////////////////////////////////////////////////////////////
///
EX_INTEE.C
///
///
This program will read and write to the ’83 or ’84
///
///
internal EEPROM. Configure the CCS prototype card as ///
///
follows: insert jumpers from 11 to 17 and 12 to 18.
///
/////////////////////////////////////////////////////////////////
#include <16C84.H>
#use delay(clock-100000000)
#use rs232 (baud=9600, xmit=PIN_A3, rv+PIN_A2)
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Example Programs
#include <HEX.C>
main () {
byte i,j,address, value;
do {
printf("\r\n\nEEPROM: \r\n")
//Displays contents
for(i=0; i<3; ++i) {
//entire EEPROM
for (j=0; j<=15; ++j) {
//in hex
printf("%2x", read_eeprom(i+16+j));
}
printf("\n\r");
}
printf ("\r\nlocation to change: ");
address= gethex();
printf ("\r\nNew value: ");
value=gethex();
write_eeprom (address, value);
} while (TRUE)
}
/////////////////////////////////////////////////////////////////
///
Library for a Microchip 93C56 configured for a x8
///
///
///
///
org init_ext_eeprom();
Call before the other
///
///
functions are used
///
///
///
///
write_ext_eeprom(a,d);
Write the byte d to
///
///
the address a
///
///
///
///
d=read_ext_eeprom (a);
Read the byte d from
///
///
the address a.
///
///
The main program may define eeprom_select,
///
///
eeprom_di, eeprom_do and eeprom_clk to override
///
///
the defaults below.
///
/////////////////////////////////////////////////////////////////
#ifndef EEPROM_SELECT
#define
#define
#define
#define
EEPROM_SELECT
EEPROM_CLK
EEPROM_DI
EEPROM_DO
PIN_B7
PIN_B6
PIN_B5
PIN_B4
#endif
#define EEPROM_ADDRESS byte
#define EEPROM_SIZE
256
void init_ext_eeprom () {
byte cmd[2];
byte i;
output_low(EEPROM_DI);
output_low(EEPROM_CLK);
output_low(EEPROM_SELECT);
cmd[0]=0x80;
cmd[1]=0x9;
for (i=1; i<=4; ++i)
shift_left(cmd, 2,0);
output_high (EEPROM_SELECT);
for (i=1; i<=12; ++i) {
output_bit(EEPROM_DI, shift_left(cmd, 2,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
}
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CCSC_March 2015-1
output_low(EEPROM_DI);
output_low(EEPROM_SELECT);
}
void write_ext_eeprom (EEPROM_ADDRESS address, byte data)
byte cmd[3];
byte i;
{
cmd[0]=data;
cmd[1]=address;
cmd[2]=0xa;
for(i=1;i<=4;++i)
shift_left(cmd,3,0);
output_high(EEPROM_SELECT);
for(i=1;i<=20;++i) {
output_bit (EEPROM_DI, shift_left (cmd,3,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
}
output_low (EEPROM_DI);
output_low (EEPROM_SELECT);
delay_ms(11);
}
byte read_ext_eeprom(EEPROM_ADDRESS address) {
byte cmd[3];
byte i, data;
cmd[0]=0;
cmd[1]=address;
cmd[2]=0xc;
for(i=1;i<=4;++i)
shift_left(cmd,3,0);
output_high(EEPROM_SELECT);
for(i=1;i<=20;++i) {
output_bit (EEPROM_DI, shift_left (cmd,3,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
if (i>12)
shift_left (&data, 1, input (EEPROM_DO));
}
output_low (EEPROM_SELECT);
return(data);
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating system to schedule tasks and how to use
///
///
the rtos_run function.
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
// this tells the compiler that the rtos functionality will be needed, that
// timer0 will be used as the timing device, and that the minor cycle for
// all tasks will be 500 miliseconds
#use rtos(timer=0,minor_cycle=100ms)
// each function that is to be an operating system task must have the #task
// preprocessor directive located above it.
// in this case, the task will run every second, its maximum time to run is
// less than the minor cycle but this must be less than or equal to the
// minor cycle, and there is no need for a queue at this point, so no
// memory will be reserved.
#task(rate=1000ms,max=100ms)
// the function can be called anything that a standard function can be called
308
Example Programs
void The_first_rtos_task ( )
{
printf("1\n\r");
}
#task(rate=500ms,max=100ms)
void The_second_rtos_task ( )
{
printf("\t2!\n\r");
}
#task(rate=100ms,max=100ms)
void The_third_rtos_task ( )
{
printf("\t\t3\n\r");
}
// main is still the entry point for the program
void main ( )
{
// rtos_run begins the loop which will call the task functions above at the
// schedualed time
rtos_run ( );
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating system rtos_terminate function
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
// a counter will be kept
int8 counter;
#task(rate=1000ms,max=100ms)
void The_first_rtos_task ( )
{
printf("1\n\r");
// if the counter has reached the desired value, the rtos will terminate
if(++counter==5)
rtos_terminate ( );
}
#task(rate=500ms,max=100ms)
void The_second_rtos_task ( )
{
printf("\t2!\n\r");
}
#task(rate=100ms,max=100ms)
void The_third_rtos_task ( )
{
printf("\t\t3\n\r");
}
void main ( )
{
// main is the best place to initialize resources the the rtos is dependent
// upon
counter = 0;
rtos_run ( );
// once the rtos_terminate function has been called, rtos_run will return
// program control back to main
printf("RTOS has been terminated\n\r");
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating system rtos_enable and rtos_disable functions ///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
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CCSC_March 2015-1
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
int8 counter;
// now that task names will be passed as parameters, it is best
// to declare function prototypes so that their are no undefined
// identifier errors from the compiler
#task(rate=1000ms,max=100ms)
void The_first_rtos_task ( );
#task(rate=500ms,max=100ms)
void The_second_rtos_task ( );
#task(rate=100ms,max=100ms)
void The_third_rtos_task ( );
void The_first_rtos_task ( ) {
printf("1\n\r");
if(counter==3)
{
// to disable a task, simply pass the task name
// into the rtos_disable function
rtos_disable(The_third_rtos_task);
}
}
void The_second_rtos_task ( ) {
printf("\t2!\n\r");
if(++counter==10) {
counter=0;
// enabling tasks is similar to disabling them
rtos_enable(The_third_rtos_task);
}
}
void The_third_rtos_task ( ) {
printf("\t\t3\n\r");
}
void main ( ) {
counter = 0;
rtos_run ( );
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating systems messaging functions
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
int8 count;
// each task will now be given a two byte queue
#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );
#task(rate=500ms,max=100ms,queue=2)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
// the function rtos_msg_poll will return the number of messages in the
// current tasks queue
// always make sure to check that their is a message or else the read
// function will hang
if(rtos_msg_poll ( )>0){
// the function rtos_msg_read, reads the first value in the queue
printf("messages recieved by task1 : %i\n\r",rtos_msg_read ( ));
// the funciton rtos_msg_send, sends the value given as the
// second parameter to the function given as the first
rtos_msg_send(The_second_rtos_task,count);
310
Example Programs
count++;
}
}
void The_second_rtos_task ( ) {
rtos_msg_send(The_first_rtos_task,count);
if(rtos_msg_poll ( )>0){
printf("messages recieved by task2 : %i\n\r",rtos_msg_read ( ));
count++;
}
}
void main ( ) {
count=0;
rtos_run();
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating systems yield function
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );
#task(rate=500ms,max=100ms,queue=2)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
int count=0;
// rtos_yield allows the user to break out of a task at a given point
// and return to the same ponit when the task comes back into context
while(TRUE){
count++;
rtos_msg_send(The_second_rtos_task,count);
rtos_yield ( );
}
}
void The_second_rtos_task ( ) {
if(rtos_msg_poll( ))
{
printf("count is : %i\n\r",rtos_msg_read ( ));
}
}
void main ( ) {
rtos_run();
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating systems yield function signal and wait
///
///
function to handle resources
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
// a semaphore is simply a shared system resource
// in the case of this example, the semaphore will be the red LED
int8 sem;
#define RED PIN_B5
#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );
#task(rate=1000ms,max=100ms,queue=2)
311
CCSC_March 2015-1
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
int i;
// this will decrement the semaphore variable to zero which signals
// that no more user may use the resource
rtos_wait(sem);
for(i=0;i<5;i++){
output_low(RED); delay_ms(20); output_high(RED);
rtos_yield ( );
}
// this will inrement the semaphore variable to zero which then signals
// that the resource is available for use
rtos_signal(sem);
}
void The_second_rtos_task ( ) {
int i;
rtos_wait(sem);
for(i=0;i<5;i++){
output_high(RED); delay_ms(20); output_low(RED);
rtos_yield ( );
}
rtos_signal(sem);
}
void main ( ) {
// sem is initialized to the number of users allowed by the resource
// in the case of the LED and most other resources that limit is one
sem=1;
rtos_run();
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating systems await function
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
#define RED PIN_B5
#define GREEN PIN_A5
int8 count;
#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );
#task(rate=1000ms,max=100ms,queue=2)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
// rtos_await simply waits for the given expression to be true
// if it is not true, it acts like an rtos_yield and passes the system
// to the next task
rtos_await(count==10);
output_low(GREEN); delay_ms(20); output_high(GREEN);
count=0;
}
void The_second_rtos_task ( ) {
output_low(RED); delay_ms(20); output_high(RED);
count++;
}
void main ( ) {
count=0;
rtos_run();
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
operating systems statistics features
///
///
///
312
Example Programs
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms,statistics)
// This structure must be defined inorder to retrieve the statistical
// information
struct rtos_stats {
int32 task_total_ticks;
// number of ticks the task has used
int16 task_min_ticks;
// the minimum number of ticks used
int16 task_max_ticks;
// the maximum number of ticks ueed
int16 hns_per_tick;
// us = (ticks*hns_per_tic)/10
};
#task(rate=1000ms,max=100ms)
void The_first_rtos_task ( );
#task(rate=1000ms,max=100ms)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
struct rtos_stats stats;
rtos_stats(The_second_rtos_task,&stats);
printf ( "\n\r" );
printf ( "task_total_ticks : %Lius\n\r" ,
(int32)(stats.task_total_ticks)*stats.hns_per_tick );
printf ( "task_min_ticks
: %Lius\n\r" ,
(int32)(stats.task_min_ticks)*stats.hns_per_tick );
printf ( "task_max_ticks
: %Lius\n\r" ,
(int32)(stats.task_max_ticks)*stats.hns_per_tick );
printf ("\n\r");
}
void The_second_rtos_task ( ) {
int i, count = 0;
while(TRUE) {
if(rtos_overrun(the_second_rtos_task)) {
printf("The Second Task has Overrun\n\r\n\r");
count=0;
}
else
count++;
for(i=0;i<count;i++)
delay_ms(50);
rtos_yield();
}
}
void main ( ) {
rtos_run ( );
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to create a basic command
///
///
line using the serial port withought having to stop
///
///
RTOS operation, this can also be considered a
///
///
semi kernal for the RTOS.
///
///
///
///
this demo makes use of the PIC18F452 prototyping board ///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
#define RED PIN_B5
#define GREEN PIN_A5
#include <string.h>
// this character array will be used to take input from the prompt
char input [ 30 ];
// this will hold the current position in the array
313
CCSC_March 2015-1
int index;
// this will signal to the kernal that input is ready to be processed
int1 input_ready;
// different commands
char en1 [ ] = "enable1";
char en2 [ ] = "enable2";
char dis1 [ ] = "disable1";
char dis2 [ ] = "disable2";
#task(rate=1000ms,max=100ms)
void The_first_rtos_task ( );
#task(rate=1000ms,max=100ms)
void The_second_rtos_task ( );
#task(rate=500ms,max=100ms)
void The_kernal ( );
// serial interupt
#int_rda
void serial_interrupt ( )
{
if(index<29) {
input [ index ] = getc ( );
// get the value in the serial recieve reg
putc ( input [ index ] );
// display it on the screen
if(input[index]==0x0d){
// if the input was enter
putc('\n');
input [ index ] = '\0';
// add the null character
input_ready=TRUE;
// set the input read variable to true
index=0;
// and reset the index
}
else if (input[index]==0x08){
if ( index > 1 ) {
putc(' ');
putc(0x08);
index-=2;
}
}
index++;
}
else {
putc ( '\n' );
putc ( '\r' );
input [ index ] = '\0';
index = 0;
input_ready = TRUE;
}
}
void The_first_rtos_task ( ) {
output_low(RED); delay_ms(50); output_high(RED);
}
void The_second_rtos_task ( ) {
output_low(GREEN); delay_ms(20); output_high(GREEN);
}
void The_kernal ( ) {
while ( TRUE ) {
printf ( "INPUT:> " );
while(!input_ready)
rtos_yield ( );
printf ( "%S\n\r%S\n\r", input , en1 );
if ( !strcmp( input , en1 ) )
rtos_enable ( The_first_rtos_task );
else if ( !strcmp( input , en2 ) )
rtos_enable ( The_second_rtos_task );
else if ( !strcmp( input , dis1 ) )
rtos_disable ( The_first_rtos_task );
else if ( !strcmp ( input , dis2 ) )
rtos_disable ( The_second_rtos_task );
else
printf ( "Error: unknown command\n\r" );
input_ready=FALSE;
index=0;
}
}
void main ( ) {
314
Example Programs
// initialize input variables
index=0;
input_ready=FALSE;
// initialize interrupts
enable_interrupts(int_rda);
enable_interrupts(global);
rtos_run();
}
315
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users. Use of Software by additional users or on a network requires payment of
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Licensee may transfer the Software and license to a third party; and such third
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Software License Agreement
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317
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