Qt on stm32 or linux based device?

mrdebug

Hi. We need to bring up a low cost device with a touch screen display for building automation. The device must to start up in less then 2 seconds.
We don't know if a Linux based device can switch on in 2 seconds, if you know one please write here wchich it is.

After having watched this video
https://www.youtube.com/watch?v=1ySTyBz2F0k
we have search for a tutorial to install a Qt application in a stm32 device but we hav found nothing.
Can someone suggest a tutorial to follow in order to use Qt on a stm32 device?

Regards.

tomasz3dk

It is possible to switch on in 2 seconds by Linux based device w Qt app, there are many videos on youtube showing that it's possible, but it requires some work. Maybe boot2Qt can do that out of box acctually i don't know if it can. Regarding to run Qt on STM32 it's in very early stage and probably you must ask Qt Company directly about this.

jsulm

@mrdebug said in Qt on stm32 or linux based device?:

stm32

this is a microcontroller and doesn't run an operating system, right? If so, then I think you can't use Qt on it as it requires an OS.

J.Hilk

@jsulm yes and no,

https://resources.qt.io/development-topic-internet-of-things/qt-on-microcontrollers-scale-down-to-under-16mb-ram-rom-showcase

But its still early stages and you would defenitly need consulting from the Qt Company itself.

Cleiton Bueno

It's possible with Linux, see:
https://www.youtube.com/watch?v=vm3Gp9KEs1w

Search for videos about fastboot Linux, Fastboot Qt.

Cleiton Bueno

Blog | Linkedin | B2Open

Cleiton Bueno

Even today we are in a project that demands to be Fastboot, our goal is 3s for this project.

Some things should be done for a Fastboot, for example:

If you can use Commercial version and qtquickcompiler and static compilation better
File System on Linux, test according to your hardware and remove support from what you will not use
Using eMMC for example is "faster" than boot via microSD / SD
Remove unnecessary resources or used during debugging of the Linux Kernel
Remove unnecessary resources or used during bootloader development
It depends on the hardware but test and validate the use of: MTD with UbiFS, use initramFS and some other alternatives
Boot system there are some, but usually systemd if you get a better job for getting parallelism to start the services
In the Qt application too, as images to be loaded use asynchronous loading, use "Lazy Load" for the first screen that would be SplashScreen

There is a general job to do, but if you get the boot you want.

Links that may help:
http://blog.qt.io/blog/2016/04/20/fast-booting-qt-devices-part-1-automotive-instrument-cluster/
http://blog.qt.io/blog/2016/04/27/fast-booting-qt-devices-part-2-optimizing-qt-application/

Cleiton Bueno

Blog | Linkedin | B2Open