LVGL port to STM32H750B disco


Based on the following port, I ported LVGL to the stm32h750b disco. Now I sometimes have strange content when touching the screen, with the lv_demo_music. See attached pictures.

Please note, the main program is loaded on the external flash. In the inner flash of the h750 is only a bootloader.

What could this be?

I suspect cache is enabled.

no, without cache it is even worse, respectively it is jerky…