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Touchscreen is more precise after a calibration, but this action is not mandatory.
Calibration data are erased after each firmware download into STMicroelectronics boards. The steps described below have to performed on a running board.
- Edit and change the value of the touchscreen_calibrator in the libinput section ot the weston.ini Weston configuration file[1]
vi /etc/xdg/weston/weston.ini [...] [libinput] touchscreen_calibrator=true calibration_helper=/bin/echo [...]
- Reboot the board
reboot
- Launch calibration
weston-touch-calibrator /sys/devices/platform/soc/40012000.i2c/i2c-0/0-002a/input/input1/event1
Touchscreen identifier may vary, depending on the devices that are connected to the board. Recommendation is to unplug all the additional input devices before booting. Otherwise, it is up to You to adapt the command line.