Matrix - 2'8 SPI Key TFT

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Introduction

Matrix-2'8 SPI Key TFT.png
  • 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.

Features

  • PCB dimension(mm):

Matrix-2'8 SPI Key TFT PCB.png

  • 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


Applications

Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-2'8_SPI_Key_TFT_nanopi_m1

Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-2'8_SPI_Key_TFT_nanopi2

Connect to NanoPi M2 / NanoPi 2 Fire

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

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:
st7789s-status


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:
fbtft-debian

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.

Resources

Update Log

Feb-24-2016

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

June-17-2016

  • Re-organized and simplified wiki