Touchscreen no work



  • Hello Qt people,

    I try run my projet on RPI, I had follow this tutorial for cross compilation,
    https://visualgdb.com/tutorials/raspberry/qt/embedded/

    Now I can use qmake and make, and compile for my RPI, launch the app directly with console without desktop environnement,

    I can start application (simple test app with one button and messagebox), if I use mouse it work.

    But I need use touchscreen (USB), and this one doing nothing.

    Can you give to me way for fix my problem ? I had try tslib, I can calibrate touchscreen with ts_calibrate and some parameter, but when I use command ./myapp -plugin tslib, app return warning "qt tslib couldn't load module input".

    NB: In this tutorial in ./configure I don't put qt-mouse-tslib parameter.

    Have nice day


  • Moderators

    @Rubis said in Touchscreen no work:

    But I need use touchscreen (USB), and this one doing nothing.

    What does this mean? Does your touchscreen not work at all? Or you do not get the touch events?



  • Hello jsulm,

    The touchscreen not work at all, I had some result with use environnement variable QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event0
    But the event "clicked()" no work, only "pressed()"
    If I touch one button with clicked event, it's visual pressed but no exec his event.



  • export QT_QPA_EGLFS_HIDECURSOR=1 (hide mouse cursor)
    export QT_QPA_EVDEV_MOUSE_PARAMETERS=/dev/input/by-id/yourtouchscreen:abs (link your ts like mouse)

    maybe export QT_QPA_EGLFS_TSLIB=0 (Ensure tslib is disabled)

    it work !


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