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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


STemWin Touch Input on STM32F429 (STMPE811)

Have you tried building a screen using the GUI builder? It puts together all of the code to put up a screen and route messages to your widgets.

I presume that you’ve already verified that you can read touch events and that the coordinates look reasonable. There’s some interesting magic (read code I can’t figure out) deep in the driver.

The STemWin demo is pretty involved since they’re trying to demonstrate all of STemWin’s capabilities. There is a HelloWorld example that is pretty straitght forrward. It doesn’t use touch but IIRC it configures touch and it is pretty easy to add STemWin screens to it.