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OS20 User Manual

10.15 Uninstalling interrupt handlers and deleting interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 76

10.16 Restrictions on interrupt handlers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

10.17 Interrupt header file: interrup.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

11 Device information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Device ID header file: device.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

12 Caches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Initializing the cache support system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Configuring the caches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Enabling and disabling the caches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Locking the cache configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Example: setting up the caches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Flushing and invalidating caches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Cache header file: cache.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

13 ST20-C1 specific features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

In-built PWM support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

ST20-C1 example plug-in timer module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Plug-in timer module header file: c1timer.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

14 ST20-C2 specific features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Two dimensional block move support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

15 Advanced configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Run-time configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Compiling OS20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Compilation option file: conf.h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Performance considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

vi

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Table of contents

Classes and objects

Defining memory partitions

Processor specific functions

Getting started

Building for OS

Starting OS20 manually

Optional debug features

Kernel header file: kernel.h

Memory and partitions

Allocation strategies

Predefined partitions

Obtaining information about partitions

Partition header file: partitio.h

OS20 tasks overview

Implementation of priority and timeslicing

OS20 priorities

Creating and running a task

Synchronizing tasks

Communicating between tasks

Suspending tasks

Getting the current task’s ID

Task termination

Waiting for termination

Deleting a task

Task header file: task.h

Semaphores overview

Using semaphores

Semaphore header file: semaphor.h

Mutexes overview

Mutex header file: mutex.h

Message handling

Message queues overview

Creating message queues

Using message queues

Message header file: message.h

Real-time clocks

ST20-C1 clock peripheral

The ST20 timers on the ST20-C

Reading the current time

Determining the tick rate

Time arithmetic

Time header file: ostime.h

Interrupt models

Selecting the correct interrupt handling system

Initializing the interrupt handling support system

Attaching an interrupt handler in OS

Initializing the peripheral device

Enabling and disabling interrupts

Example: setting an interrupt for an ASC

Locking out interrupts

Raising interrupts

10.10 Retrieving details of pending interrupts

10.11 Clearing pending interrupts

10.12 Changing trigger modes

10.13 Low power modes and interrupts

10.14 Obtaining information about interrupts

10.15 Uninstalling interrupt handlers and deleting interrupts

10.16 Restrictions on interrupt handlers

10.17 Interrupt header file: interrup.h

Device information

Device ID header file: device.h

Initializing the cache support system

Configuring the caches

Enabling and disabling the caches

Locking the cache configuration

Example: setting up the caches

Flushing and invalidating caches

Cache header file: cache.h

ST20-C1 specific features

In-built PWM support

ST20-C1 example plug-in timer module

Plug-in timer module header file: c1timer.h

ST20-C2 specific features

Two dimensional block move support

Advanced configuration

Run-time configuration

Compilation option file: conf.h

Performance considerations

Alphabetical list of functions

OS20 function descriptions

cache_config_data

cache_config_instruction

cache_disable_data

cache_disable_instruction

cache_enable_data

cache_enable_instruction

cache_flush_data

cache_init_controller

cache_invalidate_data

cache_invalidate_instruction

chan_create_address

chan_init_address

interrupt_clear

interrupt_clear_number

interrupt_delete

interrupt_disable

interrupt_disable_global

interrupt_disable_mask

interrupt_disable_number

interrupt_enable

interrupt_enable_global

interrupt_enable_mask

interrupt_enable_number

interrupt_init_controller

interrupt_install

interrupt_install_sl

interrupt_pending

interrupt_pending_number

interrupt_raise

interrupt_raise_number

interrupt_status

interrupt_status_number

interrupt_test_number

interrupt_trigger_mode_number

interrupt_uninstall

interrupt_unlock

interrupt_wakeup_number

kernel_initialize

memory_allocate

memory_allocate_clear

memory_deallocate

memory_reallocate

message_claim_timeout

message_create_queue

message_create_queue_timeout

message_delete_queue

message_init_queue

message_init_queue_timeout

message_receive

message_receive_timeout

message_release

move2d_non_zero

mutex_create_fifo

mutex_create_priority

mutex_init_fifo

mutex_init_priority

partition_create_fixed

partition_create_heap

partition_create_simple

partition_delete

partition_init_fixed

partition_init_heap

partition_init_simple

partition_status

semaphore_create_fifo

semaphore_create_fifo_timeout

semaphore_create_priority

semaphore_create_priority_timeout

semaphore_delete

semaphore_init_fifo

semaphore_init_fifo_timeout

semaphore_init_priority

semaphore_init_priority_timeout

semaphore_signal

semaphore_wait_timeout

task_delay_until

task_onexit_set

task_onexit_set_sl

task_priority_set

task_private_data

task_private_data_set

task_reschedule

task_stack_fill

task_stack_fill_set

time_ticks_per_sec

time_ticks_per_sec_set

timer_initialize

timer_interrupt

Revision history

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