Posted by Dodotronic on 2016-02-13 17:31

Hi all
I’m working on STM32F7 discovery and the graphic display.
After tested the STemWin + RTOS I had to abandon it since when enabling the SAI interface the system crashed.
Now I’m testing the basic BSP graphic and I’m building all the graphic components by myself.
Working on BSP there are many advantages since the memory and the resources are less and mainly under control. Moreover the microcontroller does no computation if there’s no touch since everything is working on the IRQ determined by the touch. It’s possible to use the multitouch and the gesture too and there’s no timer to poll the touch IC.
Even in this case all works but when the free SAI (running at 40 MHz) is enabled the screen start to flicker. I’ve seen that this problem is due to the cache and if disabled everything seems to work but not perfectly. So I’m using the two layers to swap and update the screen memory enabling and disabling and writing on the disabled one.
I’m trying to understand if this is the correct way to use the lcd.
Thanks
Ivano