Difference between revisions of "Matrix - 2'8 SPI Key TFT"
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| Line 13: | Line 13: | ||
|Pin || Description | |Pin || Description | ||
|- | |- | ||
| − | | || | + | |GND || Ground |
|- | |- | ||
| + | |5V || Supply Voltage 5V | ||
| + | |- | ||
| + | |LED_EN || Backlight | ||
| + | |- | ||
| + | |LCD_RESET || Reset | ||
| + | |- | ||
| + | |LCD_D/C || LCD Data/Command Selection | ||
| + | |- | ||
| + | |LCD_CS || LCD Chip Selection | ||
| + | |- | ||
| + | |SPICLK || SPI Clock | ||
| + | |- | ||
| + | |SPIMOSI || SPI MOSI | ||
| + | |- | ||
| + | |SPIMISO || SPI MISO | ||
| + | |- | ||
| + | |T_CS || Touch Chip Selection | ||
| + | |- | ||
| + | |T_IRQ || Touch Interrupt | ||
| + | |- | ||
|} | |} | ||
Revision as of 08:44, 16 December 2015
Contents
1 Introduction
2 Features
- PCB dimension(mm):
File:Matrix-2'8 SPI TFT PCB.png
- Pin Description:
| Pin | Description |
| GND | Ground |
| 5V | Supply Voltage 5V |
| LED_EN | Backlight |
| LCD_RESET | Reset |
| LCD_D/C | LCD Data/Command Selection |
| LCD_CS | LCD Chip Selection |
| SPICLK | SPI Clock |
| SPIMOSI | SPI MOSI |
| SPIMISO | SPI MISO |
| T_CS | Touch Chip Selection |
| T_IRQ | Touch Interrupt |
3 Basic Device Operation
4 Download Matrix Source Code
All the matrix modules' code samples are open source. They are maintained on GitHub - git://github.com/friendlyarm/matrix.git
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with。
- The nanopi branch contains the matrix modules' code samples for the NanoPi
- the tiny4412 branch contains the matrix modules' code samples for the Tiny4412
- the raspberrypi branch contains the matrix modules' code samples for the RaspberryPi
Please follow the steps below to get the source code:
Install the git utility on a PC running Ubuntu14.04
$ sudo apt-get install git
Clone the matrix code from GitHub
$ git clone git://github.com/friendlyarm/matrix.git
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
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:
| Matrix-2'8 SPI_TFT | NanoPi |
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.
