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Using Qt5 examples

Applicable platforms: STM32MP257F-EV1, STM32MP157-DK1, STM32MP157-DK2, STM32MP135-DK.

The Qt5 graphical toolkit is enabled in the demo configurations, together with a number of example applications. Note that only the base Qt5 modules are enabled in the demo configurations, but Buildroot supports several additional Qt5 modules if necessary.

The Qt5 examples are installed in the target at /usr/lib/qt/examples/.

STM32MP257 and STM32MP157

The STM32MP257 and STM32MP157 SoCs have a GPU, for which the support is enabled in the demo configuration. Qt5 is compiled with OpenGL support, and uses the eglfs backend.

udev autoloads the galcore Linux kernel module, which is the kernel driver needed to use the GPU. You can verify that this kernel module has been properly loaded:

# lsmod | grep galcore
galcore               319488  0

Then you can start the different Qt examples, for example:

# cd /sys/class/backlight/<your_backlight_device>
# cat max_brightness > brightness
# /usr/lib/qt/examples/opengl/hellogl2/hellogl2

By default it will use HDMI if a monitor is plugged in or DSI otherwise (on the DK2). You can control the display used by Qt using a Qt-specific KMS/DRM configuration file, see the Qt documentation for details.

STM32MP135

The STM32MP135 SoC does not have a GPU. Therefore, OpenGL support is not available. Qt5 is therefore compiled to use the linuxfb backend.

You can start various Qt examples. After enabling the backlight, you can start any Qt examples:

# cd /sys/class/backlight/<your_backlight_device>
# cat max_brightness > brightness
# /usr/lib/qt/examples/gui/analogclock/analogclock