How to use 15 inch touchscreens

Instructions on the usage of the 15.6 inch SAW touchscreen (LCD-15.6TS) under Debian.

This guide is tested with the LCD-15.6TS (with ETT5003U controller), distributed by Olimex LTD. The setup included LCD-OLinuXino-15.6-FHD and A20-OLinuXino-MICRO.

Important: for the hardware connection you would need to provide 5V and 12V to the touchscreen display. A free USB port is also required. The powering to the touchscreen is deliver through a standard 4-pin molex connector.

After all hardware connections are established to get the touchscreen working under the official Linux image do the following:

1. Make sure the USB connection between the display and the board is established before powering the board. If it was connected already reboot the board.

2. Identify the event number of the USB connection of the touschreen. You might plug-unplug the USB connection of the touchscreen to get the proper event number in the console (or use command dmesg | grep ETwo).

3. Create a new 20-ts.conf file or add a new section in the 20-ts.conf file (remember to replace the USB event number with the number you got in point 1, we have used event2 as example)

The file location is: /usr/share/X11/xorg.conf.d/20-ts.conf

The file should contain the following:

Section "InputClass"
 Identifier "ETwo TouchScreen"
 MatchDevicePath "/dev/input/event2"
 MatchProduct "ETwoTouch Corp. ETwo TouchScreen"
 Driver "tslib"
 Option "ScreenNumber" "0"
 Option "Rotate" "NONE"
 Option "Width" "1920"
 Option "Height" "1080"
 Option "SendCoreEvents" "yes"
 Option "Type" "touchscreen"
EndSection

Remember to replace the event2 number with the number you got in point 1. The configuration is suitable for the FullHD 15.6 inch display. If you are using the 1366x768 (HD-ready) display replace the driver option defaults with "Width" "1366" and "Height" "768".

4. Create a new environment file or edit the environment file (again we have used event2 as our USB event, remember to replace it with the number of event you get in point 1.)

The file location is: /etc/environment

TSLIB_TSEVENTTYPE=raw
TSLIB_CONSOLEDEVICE=none
TSLIB_FBDEVICE=/dev/fb0
TSLIB_TSDEVICE=/dev/input/event2
TSLIB_CALIBFILE=/etc/pointercal
TSLIB_CONFFILE=/usr/etc/ts.conf
TSLIB_PLUGINDIR=/usr/lib/ts

Again remember to replace the event2 number with the number you got in point 1.

5. Calibrate the display like root user

ts_calibrate

6. Add the following 2 lines at the end of /root/.bashrc file:

service slim stop
su - olimex -c startx &

7. Reboot the board

reboot

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