eGalax touchscreen calibration

[Markamc]

(##Disclaimer .....works with 1a5 and beta1 for me)

Ok, this is a long process atm, but does work, for me at least.

I was originally looking into changing the xbmc patch, but not had the time yet.

Method : TS_CALIBRATE

Enter the following, line by line and obviously follow the instructions:

Terminal

sudo su
stop xbmc
apt-get install libtool automake build-essential git
git clone git://github.com/kergoth/tslib.git
cd tslib
./autogen.sh
./configure
make
make install

edit the ts.conf file and remove the '# ' from '# module-raw input' on line:2 using:

Terminal

nano /usr/local/etc/ts.conf

(NB remove the space too, it will give a 'segmentation fault')
Close and save the ts.conf file

Next enter the following at the prompt......

Terminal

ls -l /dev/input/by-id

The output shows the input event that your touchscreen is linked to, My egalax TS is on /dev/input/event2

Terminal

root@xbian:/home/xbian/tslib# ls -l /dev/input/by-id
total 0
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-Riitek_Micro_Keyboard-event-kbd -> ../event0
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-Riitek_Micro_Keyboard-event-mouse -> ../event1
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-Riitek_Micro_Keyboard-if01-event-mouse -> ../event1
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-Riitek_Micro_Keyboard-if01-mouse -> ../mouse0
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-Riitek_Micro_Keyboard-mouse -> ../mouse0
lrwxrwxrwx 1 root root 9 Jan 1 1970 usb-eGalax_Inc._Touch-event-if00 -> ../event2
root@xbian:/home/xbian/tslib#

Paste the following lines at the prompt......

*** NB. change export TSLIB_TSDEVICE=/dev/input/eventX to suit your device event no. where 'X' is your value.

Terminal

export LD_LIBRARY_PATH=/usr/local/lib
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event2 <----***
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/usr/local/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/local/lib/ts

and then

Terminal

ts_calibrate

Terminal

root@xbian:/home/xbian/tslib# ts_calibrate
xres = 1280, yres = 720
Took 16 samples...
Top left : X = 317 Y = 108
Took 34 samples...
Top right : X = 324 Y = 1937
Took 16 samples...
Bot right : X = 1863 Y = 1933
Took 19 samples...
Bot left : X = 1856 Y = 113
Took 11 samples...
Center : X = 1067 Y = 1028
-21.938232 -0.000184 0.646745
-75.615356 0.402788 -0.001534
Calibration constants: -1437744 -12 42385 -4955528 26397 -100 65536
root@xbian:/home/xbian/tslib#

The information you want is from the end of the output

Terminal

Center : X = 1067 Y = 1028
-21.938232 -0.000184 0.646745
-75.615356 0.402788 -0.001534

Top line is X, bottom Y
x offest is -21.938232 , x scale factor is 0.646745
y offest is -75.615356 , y scale factor is 0.402788

so for our calib file we need this:

Code:

calib_x_d=1302;calib_x_fact=-0.647;calib_y_d=796;calib_y_fact=-0.402;swap_axes=1;

Create the calib file and enter the above calibration into the editor with:

Terminal

mkdir /usr/share/eGalaxCalibration
nano /usr/share/eGalaxCalibration/touchscreen_axes_calib

As you can see, I needed to change the direction of both axes by changing the sign on the scale factor and I also needed to swap the axes too, swap_axes=1.
ThHe offset values need to be "subtracted" from those already "programmed" into xbmc patch, hence (1280 -) -22 = 1302 (approx) and (720 -) -76 = 796

Hope it helps

bye y'all

(##Disclaimer .....works with 1a5 and beta1 for me)