The LCD interface (J9) of the PanGu development board supports capacitive (using the I2C bus) touch signal.
The function of the capacitive screen has been configured in the Linux system, and the LCD module can be connected.
Touch calibration for Weston systems
Add libinput to the /etc/xdg/weston/weston.ini configuration file on the PanGu development board.
# vi /etc/xdg/weston/weston.ini [...] [libinput] touchscreen_calibrator=true calibration_helper=/bin/echo [...] |
Then restart the weston
# systemctl restart weston |
List the current system's touch devices
# weston-touch-calibratorcould not load cursor 'dnd-move'could not load cursor 'dnd-copy'could not load cursor 'dnd-none'device "/sys/devices/platform/soc/40013000.i2c/i2c-0/0-0038/input/input1/event1" - head "DPI-1" |
Start the touch calibration, the parameter is the node file of the sysfs of the touch device
# weston-touch-calibrator /sys/devices/platform/soc/40012000.i2c/i2c-0/0-002a/input/input1/event1 |
At this point, four points will appear on the screen at a time. Each click will display a check mark, indicating that the verification is successful. If there is an error, an error message will be displayed on the command line.
Touch calibration for Qt system
Configuring touched environment variables
export TSLIB_CALIBFILE=/etc/pointercalexport TSLIB_CONSOLEDEVICE=noneexport TSLIB_CONFFLLE=/etc/ts.confexport TSLIB_TSDEVICE=/dev/input/event1export TSLIB_TSEVENTTYPE=INPUTexport QT_QPA_EGLFS_TSLIB=1export QT_QPA_EVDEV_MOUSE_PARAMETERS=/dev/input/event1export QT_QPA_EGLFS_KMS_CONFIG=/usr/share/qt5/cursor.jsonexport QT_QPA_GENERIC_PLUGINS=tslib:/dev/input/event1,evdevmouseexport QT_QPA_EGLFS_DISABLE_INPUT=1 |
Perform touch calibration procedure
./tscalibrate |
The LCD displays five coordinates, and when clicked, the calibration is displayed successfully.