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, tempered glass touch panel

By default the module's backlight is turned on after the module is powered on. LED_EN can be set to turn off the backlight. If you don’t want the backlight to be turned on after the module is powered on you can take off R12 and in this case you can turn on the backlight by pulling up LED_EN.

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 / NanoPi 2 Fire:
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

7.2 June-17-2016

• Re-organized and simplified wiki