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{{InfoBoxTop}}{{Applies To Diva}}{{InfoBoxBottom}} == Touchscreen Calibration History ==
{| class="wikitable" border="1"
!Version
!Date
!Divelk DIVELK version!Hardware Part Nr
!Notes
|-
|4.0.0
|April 2018<br/><hr/> March 2019|[[Diva_Embedded_Linux_Kit_(DIVELK)#DIVELK_4.0.0|DIVELK 4.0.0]]<br/><hr/> [[Diva_Embedded_Linux_Kit_(DIVELK)#DIVELK_4.0.1|DIVELK 4.0.01]]
|
|-
|}
== Calibration ==
=== Weston ===
If the Weston compositor is running in the background, it is necessary to remove the old udev rules, and restart the device in order to calibrate the touchscreen.
<pre>
rm -f /etc/udev/rules.d/ws-calibrate.rules
reboot
</pre>
At the next restart the weston-calibrator tool should automatically show up. Tap on the red cross appearing on the screen to calibrate the touch panel.
'''Note:''' In the case of root filesystem over NFS and SD card plugged in, make sure delete also the calibration rules stored in the SD card partition before rebooting:
<pre>
rm /etc/udev/rules.d/ws-calibrate.rules
rm /run/media/mmcblk0p1/ws-calibrate.rules
reboot
</pre>
=== Non-Weston based Graphic System ===
If the weston compositor is not running, it is necessary to run:
<pre>
export TSLIB_CALIBFILE=/usr/share/pointercal
ts_calibrate
</pre>
==== Exporting TSLIB_CALIBFILE ====
The environment variable TSLIB_CALIBFILE is used by the tslib package to indicate the location of the pointercal file. The default value for TSLIB_CALIBFILE is /etc/pointercal. If you are writing a program that uses tslib you should make sure that you export TSLIB_CALIBFILE to point to the location of your pointercal file (as indicated in the previous section), or that you place a copy of the pointercal file at the default /etc/pointercal location.
Additional information can be found int the following [http://processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen#Where_is_the_ws-calibrate.rules_file.3F page in TI wiki]
