Matrix - 2'8 SPI Key TFT

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1 Introduction

• The Matrix-2.8_SPI_Key_TFT LCD is a FriendlyARM developed LCD module with resistive touch panel. Its resolution is 320 x 240. It uses the ST7789S IC and XPT2046 resistive touch IC. It has SPI interface and three configurable user keys.

• Specification

LCD Dimension	2.8"
Display Area	57.6mm*43.2mm
Driver IC	ST7789S
Resolution	320 * 240（RGB）
MCU Interface	SPI
Power Supply	5V
Backlight Voltage	5V
Touch	Resistive Touch, 钢化玻璃触摸屏

模块上电默认打开背光，可通过置低LED_EN引脚关闭背光。如果需要关闭上电打开背光，只需要拿到电路板上的R12电阻，再通过置高LED_EN引脚打开背光；

2 Features

• PCB dimension(mm):

• Pin Description:

Pin	Description	Pin	Description
1	VDD_3.3V	2	VDD_5V
3	NC	4	VDD_5V
5	NC	6	GND
7	LCD_RESET	8	NC
9	GND	10	NC
11	LED_EN	12	NC
13	KEY_1	14	GND
15	KEY_2	16	KEY_3
17	VDD_3.3V	18	T_IRQ
19	SPI_MOSI	20	GND
21	SPI_MISO	22	LCD_D/C
23	SPI_CLK	24	LCD_CS
25	GND	26	T_CS

3 Applications

3.1 Connect to NanoPi M1

Please refer to the following connection diagram to connect the module to the NanoPi M1:

3.2 Connect to NanoPi 2

Please refer to the following connection diagram to connect the module to the NanoPi 2:

3.3 Connect to NanoPi M2 / NanoPi 2 Fire

Please refer to the following connection diagram to connect the module to the NanoPi M2 / P2:
Matrix-2'8_SPI_Key_TFT_nanopi_m2

4 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code:

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix:

cd matrix/demo/nanopi-status
./build.sh
./run.sh /dev/fb-st7789s

The nanopi-status is a small Qt utility which can be used to list system's basic information. Here is what you should expect to observe:

5 Display Debian GUI on 2.8"LCD

Boot your ARM board with Debian and and launch the Debian GUI by running the following commands:

$ cd matrix/demo/nanopi-status/
$ ./display-debian.sh /dev/fb-st7789s

Calibrate the screen by following the four points' movement:

After calibration is done you will see the following system information:

Section "InputClass" 
        Identifier      "calibration" 
        MatchProduct    "ADS7846 Touchscreen" 
        Option  "Calibration"   "196 3825 3887 358" 
        Option  "SwapAxes"      "0" 
EndSection

Copy and paste the information to the "/usr/share/X11/xorg.conf.d/99-calibration.conf" file, save it and this will be used as your calibration data when you reboot your board.

7 Update Log

7.1 Feb-24-2016

• Added the driver's source code location in Section 5.2