LCD8000-43T-EX1/ LCD8000-70T-EX1

A Portable LCD Solution for Atmel SAMA5D3 Xplained

By

User Manual

Version 1

Jul 2014

DISCLAIMER

This product is intended to be used for ENGINEERING DEVELOPMENT,

DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by element14 to be a finished end product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.

The goods being provided are not intended to be complete in terms of required design and/or manufacturing related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards.

Revision History:

Version

1.0

Date

30/7/2014

Description

Original Version

Table of Contents

1 Product Overview ....................................................................... 1

1.1 Brief Introduction ........................................................................ 1

1.2 Block Diagrams ........................................................................... 1

2 Interfaces on LCD-EX ................................................................. 3

2.1 Locations and Types of Interfaces ................................................. 3

2.2 Pin Definitions of Interfaces .......................................................... 4

2.2.1 Pin Definitions of J1 ............................................................................. 4

2.2.2 Pin Definitions of J2 ............................................................................. 7

2.2.3 Pin Definitions of J13 ........................................................................... 9

2.2.4 SPI Line Module Select ...................................................................... 11

3 Use of LCD-EX ........................................................................... 12

3.1 Configuring the Kernel ............................................................... 12

3.1.1 Configuration File for 4.3” LCD ........................................................... 12

3.1.2 Remove IRQ Register Information ....................................................... 14

3.1.3 Configuring the kernel to include drivers for TSC2045. .......................... 15

3.2 Connections and Tests ............................................................... 16

4 Troubleshooting ....................................................................... 18

1 Product Overview

1.1 Brief Introduction

LCD-EX is a 16/24-bit RGB parallel conversion module designed for

TFT-LCD displays. The module integrates a TSC2046 chip to provide touch functionality and a 3.3V regulation chip with the capability to implement I

2

C control and PWM backlight control. It supports 16-bit and 24-bit driving modes for LCD displays, as well as the connection of

SPI 4-wire resistive touch-screens.

1.2 Block Diagrams

Figure 1 shown below, is a block diagram demonstrating how the

LCD-EX works when using a 16-bit logic interface.

Controller

RIoT

POWER

LCD_PWM

I

2

C

TP_BUSY

TP_INT

TP_SPI

SPI Touch INF

DISP0_DEN

DISP0_HSY

16bit RGB

DISP0_VSY

DISP0_CLK

（

565）

DB0 ~ DB15

Figure 1

16-Bit Logic Interface

LCD

Interface

Page | 1

Figure 2 shown below, is a block diagram demonstrating how LCD-EX

works when using 24-bit logic interface.

Controller

A5

POWER

LCD_PWM

I

2

C

TP_BUSY

TP_INT

TP_SPI

SPI Touch INF

DISP0_DEN

DISP0_HSY

DISP0_VSY

DISP0_DEN

DISP0_HSY

DISP0_VSY

24 bit RGB INF

Figure 2

24-Bit Logic Interface

A5

LCD

Interface

Page | 2

2 Interfaces on LCD-EX

2.1 Locations and Types of Interfaces

The following images show the locations of the interfaces on LCD-EX.

J1

1 J14 3 2 1

2 J15 3 2 1

3 J12 3 2 1

4 J11 3 2 1

J2

Figure 3

J1/J2 Interfaces

J13

Figure 4

J13 Interface

Page | 3

The following table lists the descriptions of the interfaces on LCD-EX.

J11

J12

J14

J15

Name

J1

J2

J13

Description

50-Pin interface for coloured display

24-bit RGB A5 interface

16-bit 565 RIoT interface

SPI line module Select

2.2 Pin Definitions of Interfaces

The following tables contain detailed information about the interfaces on LCD-EX.

2.2.1 Pin Definitions of J1

Pin Definition Description

4

5

6

1

2

3

7

8

9

B3

B4

B5

B0

B1

B2

B6

B7

GND

Blue Data0

Blue Data1

Blue Data2

Blue Data3

Blue Data4

Blue Data5

Blue Data6

Blue Data7

GND

Page | 4

28

29

30

31

32

25

26

27

22

23

24

19

20

21

16

17

18

13

14

15

Pin

10

11

12

R0

R1

R2

G6

G7

GND

Definition

G0

G1

G2

Description

Green Data0

Green Data1

Green Data2

G3

G4

G5

Green Data3

Green Data4

Green Data5

Green Data6

Green Data7

GND

Red Data0

Red Data1

Red Data2

R3

R4

R5

R6

R7

GND

Red Data3

Red Data4

Red Data5

Red Data6

Red Data7

GND

DEN

HSYNC

Pixel data enable (TFT)

LCD Horizontal Synchronization

VSYNC LCD Vertical Synchronization

GND

CLK

GND

LCD Pixel Clock

Page | 5

42

43

44

39

40

41

36

37

38

Pin

33

34

35

48

49

50

45

46

47

Definition

GND

X+ x-

Description

GND

X+ Position Input

X- Position Input

Y+

Y-

Y+ Position Input

Y - Position Input

SPI_CLK SPI serial clock

SPI_MOSI SPI Master Output, Slave Input

SPI_MISO SPI Master Input, Slave Output

SPI_CS SPI Chip Select

IIC_CLK IIC master serial clock

IIC_DAT IIC serial bidirectional data

GND GND

VDD1

VDD2

VDD3

3.3V

3.3V

5V

VDD3

RESET

5V

Reset

PWREN Backlight enable

Page | 6

10

11

12

7

8

9

4

5

6

1

2

3

2.2.2 Pin Definitions of J2

Pin Definition

GND

5V

5V

NC

LCD_PWM

TP_BUSY

GND

VCC Input

VCC Input

NC

Description

Backlight enable

Touch Pad Busy Signal

TP_INT

I2C_CLK

I2C_DAT

Touch Pad Interrupt

IIC master serial clock

GND

NC

CSPI_CLK

VCC Input

VCC Input

CSPI_MOSI NC

16

17

18

13

14

15

19

20

21

22

CSPI_MISO Backlight enable

TP_SPI_SCSn Touch Pad Busy Signal

DISP0_DEN Touch Pad Interrupt

DISP0_HSYNC IIC master serial clock

DISP0_VSYNC IIC serial bidirectional data

DISP0_CLK NC

GND SPI serial clock

DISP0_DAT23 SPI Master Output, Slave Input

DISP0_DAT22 SPI Master Input, Slave Output

DISP0_DAT21 SPI Chip Select

Page | 7

42

43

44

45

46

39

40

41

36

37

38

33

34

35

30

31

32

27

28

29

23

24

25

26

DISP0_DAT20 Data enable (TFT)

GND LCD Horizontal Synchronization

DISP0_DAT19 LCD Vertical Synchronization

DISP0_DAT18 DISP0_DAT18

DISP0_DAT17 DISP0_DAT17

DISP0_DAT16 DISP0_DAT16

GND GND

DISP0_DAT15 DISP0_DAT15

DISP0_DAT14 DISP0_DAT14

DISP0_DAT13 DISP0_DAT13

DISP0_DAT12 DISP0_DAT12

GND GND

DISP0_DAT11 DISP0_DAT11

DISP0_DAT10 DISP0_DAT10

DISP0_DAT9 DISP0_DAT9

DISP0_DAT8 DISP0_DAT8

GND

DISP0_DAT7

DISP0_DAT6

GND

DISP0_DAT7

DISP0_DAT6

DISP0_DAT5

DISP0_DAT4

GND

DISP0_DAT3

DISP0_DAT2

DISP0_DAT5

DISP0_DAT4

GND

DISP0_DAT3

DISP0_DAT2

Page | 8

47

48

49

DISP0_DAT1

DISP0_DAT0

GND

DISP0_DAT1

DISP0_DAT0

GND

50

ID_SYS

2.2.3 Pin Definitions of J13

Pin Definition

ID_SYS

5

6

7

1

2

3

4

NC

5VIN

GND

GND

DISP0_CLK

DISP0_DAT3

DISP0_DEN

Description

NC

VCC Input

GND

GND

LCD Pixel Clock

DISP0_DAT3

Data enable (TFT)

11

12

13

8

9

10

14

15

16

17

DISP0_DAT4 DISP0_DAT4

DISP0_HSYNC Horizontal Synchronization

DISP0_DAT5 DISP0_DAT5

DISP0_VSYNC Vertical Synchronization

DISP0_DAT6 DISP0_DAT6

DISP0_DAT7 DISP0_DAT7

DISP0_DAT23 DISP0_DAT23

DISP0_DAT15 DISP0_DAT15

NC NC

DISP0_DAT19 DISP0_DAT19

Page | 9

34

35

36

31

32

33

37

38

39

40

28

29

30

25

26

27

22

23

24

18

19

20

21

NC NC

DISP0_DAT20 DISP0_DAT20

TBD TBD

DISP0_DAT21 DISP0_DAT21

TBD TBD

DISP0_DAT22 DISP0_DAT22

TP_BUSY Touch Pad Busy Signal

DISP0_DAT10 DISP0_DAT10

TP_INT Touch Pad Interrupt

DISP0_DAT11 DISP0_DAT11

CSPI_MOSI SPI Master Output, Slave Input

DISP0_DAT12 DISP0_DAT12

CSPI_CLK SPI Master Input, Slave Output

NC NC

TP_SPI_SCSn DISP0_DAT6

NC NC

CSPI_MISO

I2C4_SCL

DISP0_DAT5

IIC master serial clock

DISP0_DAT13 DISP0_DAT13

I2C4_SDA IIC serial bidirectional data

DISP0_DAT14 DISP0_DAT14

GND

LCD_PWM

GND

Backlight Enable

Page | 10

2.2.4 SPI Line Module Select module Application

V 1

V 2

Jumper cap select

The SPI module of

SAMA5D3 Xplained (J22)

J11 PIN3------PIN2 PIN 37 = SPI0_NPCS3

PIN 38 = SPI0_MISO

SAMA5D3

Xplained

Version A

J12 PIN3------PIN2

J14 PIN3------PIN2

J15 PIN3------PIN2

PIN 39 = SPI0_MOSI

PIN 40 = SPI0_SPCK

J11 PIN1------PIN2 PIN 37 = SPI0_SPCK

SAMA5D3

Xplained

Version B

J12 PIN1------PIN2

J14 PIN1------PIN2

PIN 38 = SPI0_MOSI

PIN 39 = SPI0_MISO

J15 PIN1------PIN2 PIN 40 = SPI0_NPCS3

Page | 11

3 Use of LCD-EX

Hereafter the SAMA5D3 Xplained development board and a 4.3” LCD module will be used as the example devices working with LCD-EX.

Note:

 If using a 7” LCD module, it is recommended to use a mains power supply, do

not use a PC based USB power supply.

3.1 Configuring the Kernel

1. The Linux kernel includes many DTS files suited for different kinds of chips and platforms. Assuming a 4.3” LCD display is used, the configuration file should be selected accordingly. (Different sizes of

LCDs need different DTS files, but with similar configuration.)

Note:

 The code marked in blue in the following examples can be modified to cater for different configurations.

3.1.1 Configuration File for 4.3” LCD

cd linux-3.10.0 vim arch/arm/boot/dts/ at91-sama5d3_xplained_pda4.dts ahb {

apb {

mmc0: mmc@f0000000 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_mmc0_clk_cmd_dat0 &pinctrl_mmc0_dat1_3

&pinctrl_mmc0_dat4_7 &pinctrl_mmc0_cd>;

status = "okay";

slot@0 {

reg = <0>;

Page | 12

bus-width = <8>;

cd-gpios = <&pioE 0 GPIO_ACTIVE_LOW>;

};

};

spi0: spi@f0004000 {

cs-gpios = <&pioD 13 0>, < &pioD 16 0 >, <0>, <0>;

status = "okay"; ads7846: touchscreen@0 {

compatible = "ti,tsc2046";

reg = <1>;

spi-max-frequency = <1000000>;

pinctrl-names = "default";

pendown-gpio = <&pioE 7 0>;

irq = <&pioE 7 0>;

ti,settle-delay-usec = /bits/ 16 <150>;

ti,debounce-max = /bits/ 16 <10>;

ti,debounce-tol = /bits/ 16 <5>;

ti,debounce-rep = /bits/ 16 <1>;

ti,keep-vref-on = /bits/ 16 <1>;

ti,x-min = /bits/ 16 <0>;

ti,x-max = /bits/ 16 <8000>;

ti,y-min = /bits/ 16 <0>;

ti,y-max = /bits/ 16 <4800>;

ti,x-plate-ohms = /bits/ 16 <40>;

ti,pressure-max = /bits/ 16 <255>;

linux,wakeup;

status = "okay";

};

};

can0: can@f000c000 {

status = "okay";

};

Page | 13

The IRQ register information of mxt needs to be removed when connecting a resistive touch-screen, because the atmel_mxt_ts IRQ pin of the display would be used by module driver too.

3.1.2 Remove IRQ Register Information

vim arch/arm/boot/dts/at91-sama5d3_xplained_dm_pda4.dtsi ahb {

apb {

i2c1: i2c@f0018000 {

qt1070: keyboard@1b {

compatible = "qt1070";

reg = <0x1b>;

interrupt-parent = <&pioE>;

interrupts = <8 0x0>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_qt1070_irq>;

wakeup-source;

};

atmel_mxt_ts@4a {

compatible = "atmel,atmel_mxt_ts";

reg = <0x4a>;

/*

interrupt-parent = <&pioE>;

interrupts = <7 0x0>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_mxt_ts>;

*/

status = "okay";

};

};

Page | 14

3.1.3 Configuring the kernel to include drivers for TSC2045.

make ARCH=arm menuconfig

Device Drivers --->

Input device support --->

[*] Touchscreens --->

<*> ADS7846/TSC2046/AD7873 and AD(S)7843 based touchscreens

2. Execute the following instructions to recompile the kernel



make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- dtbs



make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- uImage

3. The image files generated can be found under the following directories:

DTB image: arch/arm/boot/dts/at91-sama5d3_xplained_pda4.dtb

uImage: arch/arm/boot/uImage

Page | 15

3.2 Connections and Tests

1.

Use two flat ribbon cables with pins on same side to connect the conversion module, SAMA5D3 Xplained and LCD module together as shown below.

Figure 5

Hardware Connections

2.

Connect the debugging serial interface of the SAMA5D3 Xplained to a

PC and then power on the development board.

3.

Update the system with the new uImage and at91-sama5d3_xplained_pda4.dtb, and then reboot to enter the

Linux system.

4.

Execute the following instruction to view the device node of the touch-screen.

 root@sama5d3_xplained:~# dmesg |grep -ir ads7846

Page | 16

The terminal window shows the following information: ads7846 spi0.1: touchscreen, irq 52 input: ADS7846 Touchscreen as

/devices/ahb.0/apb.1/f0004000.spi/spi_master/spi0/spi0.1/input/ input0

Note:

 The characters above marked in blue represent the device node.

 input0 is associated to /dev/input/event0, input1 is associated to

/dev/input/event1, and so on.

5.

Execute the following instruction to set environment variable for tslib:

 root@sama5d3_xplained:~# export TSLIB_TSDEVICE=/dev/input/event0

6.

Execute the following instruction to run a calibration on touch-screen:

 root@sama5d3_xplained:~# ts_calibrate

7.

Execute the following instruction to test touch-screen:

 root@sama5d3_xplained:~# ts_test

Page | 17

4 Troubleshooting

Please note the following common issues which can be encountered when connecting hardware to LCD-EX:

1.

If the touch-screen is not as precise as it should be after screen calibration, please check the connection between the module and the flat ribbon cable to ensure that the 4 touch interface pins on the module are correctly connected to the pins of the touch-screen.

2.

There are two 50-pin PFC interfaces on the module named J1 and J2 respectively. J1 is a flip-lock connector used to connect LCDs, J2 is a slide-lock connector used to connect controllers. LCD displays will not function correctly if connected to the wrong interface.

Page | 18