Matrix - 2'8 SPI Key TFT
Contents
1 Introduction
- Matrix-2'8_SPI_Key_TFT模块是一款2.8英寸的TFT 触摸LCD，模块采用ST7789S驱动IC和XPT2046电阻式触摸IC，屏幕分辨率为320*240，采用SPI控制接口，模块还包含3个独立按键，可根据需要自定义功能。
- 详细规格如下所示：
| LCD尺寸 | 2.8寸 |
| 显示区域 | 57.6mm*43.2mm |
| 驱动IC | ST7789S |
| 分辨率 | 320*240（RGB） |
| 接口方式 | SPI |
| 工作电压 | 5V |
| 背光电压 | 5V |
| 触摸屏类型 | 电阻式，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
启动开发板并运行Debian系统，执行下列命令启动Debian桌面：
$ cd matrix/demo/nanopi-status/ $ ./display-debian.sh /dev/fb-st7789s
用触摸笔在屏幕上点击4个点完成校准并进入Debian桌面，效果如下：
完成触摸校准后终端会有类似如下的打印信息：
Section "InputClass" Identifier "calibration" MatchProduct "ADS7846 Touchscreen" Option "Calibration" "196 3825 3887 358" Option "SwapAxes" "0" EndSection
将上述内容手动保存在/usr/share/X11/xorg.conf.d/99-calibration.conf中，以后就再也无需进行校准了。
6 Resources
7 Update Log
7.1 Feb-24-2016
- Added the driver's source code location in Section 5.2
