eGalax touchscreen calibration

[Markamc]

(23rd May, 2013 09:19 AM)brantje Wrote:  

(23rd May, 2013 06:32 AM)Markamc Wrote:  ...
it should generate some info about your device in a file , "evtest-capture.xml"

you can check if your touchscreen is functioning on a kernel level

good luck

Can we use that info to generate a valid config file?
My axes are wrong.. no matter if i set swap_axes

Terminal

Input driver version is 1.0.1
Input device ID: bus 0x3 vendor 0xeef product 0x1 version 0x100
Input device name: "eGalax Inc. USB TouchController"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 330 (BTN_TOUCH)
Event type 3 (EV_ABS)
Event code 0 (ABS_X)
Value 562
Min 0
Max 2047
Event code 1 (ABS_Y)
Value 1510
Min 0
Max 2047
Properties:
Testing ... (interrupt to exit)
***********************************************
This device is grabbed by another process.
No events are available to evtest while the
other grab is active.
In most cases, this is caused by an X driver,
try VT-switching and re-run evtest again.
***********************************************

When you say wrong, how?

(NB. If you exit xbmc then you get finger press info feedback in evtest)

The new beta1 build swapped mine, I had to change to swap_axes=1, it didn't change the direction though, (i didn't need to reverse the sign (+/-) of the "fact" scale values)

Not sure yet, still looking into it. Needs a addon script to "tune" evdev values to screen coordinates to automatically calculate offset/scale values for calib file.

Been searching many places including..
http://tias.ulyssis.org/calibration/ and
http://www.embedded.com/design/configurable-systems/4023968/How-To-Calibrate-Touch-Screens

I keep trying, in my spare time.