Difference between revisions of "Matrix - 2'8 SPI Key TFT"

Revision as of 15:47, 16 June 2016

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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：

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:

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 Connect to NanoPi

5.1 Preparations

Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki:NanoPi
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.

$ git clone https://github.com/friendlyarm/linux-4.x.y.git
$ cd linux-4.x.y
$ git checkout nanopi-v4.1.y-matrix
$ make nanopi_defconfig
$ touch .scmversion
$ make

5.2 Hardware Connection

Please refer to the following connection diagram to connect the Matrix-2'8 SPI_TFT to the NanoPi
Matrix-2'8 SPI_TFT_nanopi

Connection Details:

5.3 Load Driver

Power on the NanoPi and run the following command in Debian's terminal to load drivers:

$ modprobe fbtft_device name=matrix-spi_tft gpios=dc:161,reset:162,cs:163
$ modprobe matrix_ads7846

The "fbtft_device" module is the driver for the st7789s chip and the "matrix_ads7846" module is the driver for the xpt2046 chip.

5.4 Install Package

Please run the following commands in Debian's terminal to install "qtembedded" and "matrix-tslib"

$ apt-get update
$ apt-get install qtembedded
$ apt-get install matrix-tslib

The "qtembedded" library is what qt applications rely on and the "matrix-tslib" library is what screen calibration relies on.

5.5 Run Test Program

Start Qt applications

$ . /usr/bin/matrix-setqt4env
$ /usr/local/Trolltech/QtEmbedded-4.8.5-arm/examples/tetrix -qws

The matrix-setqt4env script sets the environmental variables which Qt and tslib rely on. If it is run on a platform for the first time a screen calibration GUI will be launched. Users need to go through a five-point calibration process to calibrate the screen. The tetrix application is a game developed in Qt4.

6 Connect to Tiny4412

7 Connect to RaspberryPi

8 Connect to Arduino

9 Resources

10 Update Log

10.1 Feb-24-2016

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