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Touchscreen with embedded Qt5 not working

I have qt5 embedded in Linux. My touchscreen doesn't work when I run my program with a Linux framebuffer like:

./myprog -plugin tslib:/dev/input/event0

More details:

  • ts_calibrate

    works great
  • When I run my program with ./myprog -platform eglfs

    , the touch screen works fine

  • my environment:

    TSLIB_TSDEVICE=/dev/input/event0
USER=root
LD_LIBRARY_PATH=/usr/local/Qt-5.3.2/lib/
TSLIB_TSEVENTTYPE=INPUT
OLDPWD=/usr/local/Qt-5.3.2
HOME=/root
QTDIR=/
TSLIB_FBDEVICE=/dev/fb0
QT_QPA_EVDEV_KEYBOARD_PARAMETERS=/dev/input/event1
TSLIB_PLUGINDIR=/usr/lib/ts
TSLIB_CONSOLEDEVICE=none
LOGNAME=root
TERM=vt102
QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=rotate=270
PATH=/sbin:/usr/sbin:/bin:/usr/bin
QT_QPA_GENERIC_PLUGINS=evdevmouse:/dev/input/event0
TSLIB_CONFFILE=/etc/ts.conf
SHELL=/bin/sh
QWS_DISPLAY=powervr
QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0:rotation=0
PWD=/root
QWS_MOUSE_PROTO=tslib
TSLIB_CALIBFILE=/etc/pointercal

  • Qt 5.3.2 config.status

    :

     configure -verbose -confirm-license -release -no-xcb -no-pch -icu -tslib -qpa eglfs -no-c++11 -no-cups -no-gtkstyle -make libs -opensource -skip qtactiveqt -skip qtandroidextras -skip qtconnectivity -skip qtenginio -skip qtimageformats -skip qtlocation -skip qtmacextras -skip qtsensors -skip qtserialport -skip qttranslations -skip qttools -skip qtwebkit-examples -skip qtwinextras -skip qtx11extras -xplatform linux-omap3-g++ -qpa eglfs -qpa linuxfb -evdev
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4 answers


Qt support tslib

is iffy. I found that the Qt part is trying to implement gestures, but the Qt part is trying to match strokes to mouse clicks. In my own experience, the result was unfinished / discarded gestures.



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Hope you find a solution. If not, try this:

  • Specify TSLIB device

    export TSLIB_TSDEVICE = / dev / input / event0

  • On some device you need to enable TSLIB support (not required on my board)

    export QT_QPA_FB_TSLIB = 1

  • Run the application

    ./myCuteQt5App -platform linuxfb -plugin tslib



Everything should work as expected (works like a charm in my case;)).

Hope it helps.

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Since you have evdev

, you may have more success than typing. I've used the following successfully: 

export QT_QPA_PLATFORM=linuxfb
export QT_QPA_GENERIC_PLUGINS=evdevtouch,evdevmouse,evdevkeyboard
export QT_QPA_EVDEV_KEYBOARD_PARAMETERS=grab=1
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as of tslib version 1.3, you can use the included ts_uinput daemon to create the evdev input device. Point the evdev environment to it and you have filtered tllib and calibrated touch input without using the QT tslib plugin.

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