Information:

This is a linux user space daemon-driver for ADS7846 based touch screen. Daemon is intended for Allwiner based devices like Orange Pi. Program includes calibration mode ( --cal ) with visual guidence based on X11. Tested for Orange Pi PC Plus running Armbian.

Attributions:

SPI communication is based on c++ wrapper created by Philippe Van Hecke - https://github.com/lephiloux/spidev-lib . Touch screen calibration procedure was designed and coded by Carlos E. Vidales - http://www.embedded.com/design/system-integration/4023968/How-To-Calibrate-Touch-Screens .

Tips:

When using Waveshare LCDs like http://www.waveshare.com/wiki/10.1inch_HDMI_LCD bear in mind RPi pinout incompatibility of OrangePi. Reroute CS pin to PC3 (SPI0_CS) of your OPi - solder the pin 26 and 24 together or use extension cables for all SPI signals.

If you wan to use nonroot user add /etc/udev.d rule for spi and gpio.

How to:

Install WereCatf version of WiringOP for handling pin/pen interrupt and X11 dependencies:

$ apt-get install libx11-dev libxtst-dev
$ git clone https://github.com/zhaolei/WiringOP.git -b h3 
$ cd WiringOP
$ chmod +x ./build
$ ./build

Compile using:

$ git clone https://github.com/Tomasz-Mankowski/ADS7846-X11-daemon.git
$ cd ADS7846-X11-daemon
$ make

Calibrate touch screen:

$ ./ADS7846-X11 --cal

Run:

$ ./ADS7846-X11

Or run it as service/daemon using:

$ nohup ./ADS7846-X11 > /dev/null 2>&1 &

For help use:

$ ./ADS7846-X11 --help