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Arcom Embedded Linux Technical Manual Configuring AEL

Calibrating touchscreens

Touchscreen support is provided by tslib, which obtains the raw touch events from the

kernel input event subsystem. It also includes modules for calibration, jitter reduction,

and so on.

Tslib requires both the kernel input event interface (provided by the evdev module) and

the correct driver for the touchscreen hardware. /dev/input/eventN devices are assigned

to input devices dynamically and you must determine which device is the touchscreen.

Here is an example:

# dmesg | grep input

input: AT Translated Set 2 keyboard as /class/input/input0

input: ImPS/2 Generic Wheel Mouse as /class/input/input1

input: Touchscreen panel as /class/input/input2

The above shows 3 input devices, a keyboard (/dev/input/event0), a mouse

(/dev/input/event1) and the touchscreen (/dev/input/event2).

Calibrating the touchscreen is done using the ts_calibrate utility:

# TSLIB_TSDEVICE=/dev/input/event2 ts_calibrate

If you wish to use the touchscreen under the X Window System you must use the same

framebuffer resolution as that used by X.

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Eurotech ZEUS Manual de usuario Pagina 23