This is an old revision of the document!
The default QT packages from Ubuntu official are built with OpenGL Desktop support, but for VIMs, there don’t have Mali GPU driver under X11, so you can’t use QT with GPU.In order to use QT with GPU (fbdev), we have rebuilt the QT packages with eglfs Mali GPU support.
Please make sure you use the latest image, if not please follow Upgrade The System to upgrade your system.
Install QT5 packages.
$ sudo apt update $ sudo apt install qt5-default qtbase5-examples $ mkdir /tmp/qt5 $ cd /tmp/qt5 $ wget https://dl.khadas.com/repos/debs/vim3/focal/qt5/libqt5gui5_5.12.8%2Bdfsg-0ubuntu2_arm64.deb $ sudo dpkg -i libqt5gui5_5.12.8+dfsg-0ubuntu2_arm64.deb
Switch to Framebuffer mode.For desktop image, you can use Ctrl
+Alt
+F1
to switch to framebuffer console mode.
Setup the environment variables below.
$ export QT_QPA_PLATFORM=eglfs $ export QT_QPA_EGLFS_INTEGRATION=eglfs_mali
Run test:
$ /usr/lib/aarch64-linux-gnu/qt5/examples/opengl/qopenglwidget/qopenglwidget
If every thing works you will see the QT demo running on screen.
For more demos, please check /usr/lib/aarch64-linux-gnu/qt5/examples
.
If you want to run the QT demo on TS050 touchscreen you need to remove the HDMI cable first.
The TS050 touchscreen is 'portrait mode
' by default, if you want to use the QT under 'landscape mode
' you need to setup the environment variables below to rotate the screen and touchscreen:
export QT_QPA_EGLFS_ROTATION=90 export QT_QPA_EGLFS_DISABLE_INPUT=1 export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event3:rotate=90 export QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event3
export QT_QPA_EGLFS_ROTATION=90 export QT_QPA_EGLFS_DISABLE_INPUT=1 export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event4:rotate=90 export QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/event4
For other orientation rotation, you can change them yourself.
When you install such version of library you will break some packages (such as qtcreator) which depend on the original library, if you don’t want to break the packages you can follow the instructions below to install the original QT5 library.
$ wget http://ports.ubuntu.com/pool/universe/q/qtbase-opensource-src/libqt5gui5_5.12.8+dfsg-0ubuntu1_arm64.deb $ sudo dpkg -i libqt5gui5_5.12.8+dfsg-0ubuntu1_arm64.deb