Hi all,
we have a custom made STM32H7A3 board and have an issue with the TouchGFX screen display:
The display flickers heavily with every new screen it should display, after a short time it is stabilized and ok.
Components and Setup:
STM32H7A3 at 280 MHz (8 MHz crystal)
Display with parallel interface, 800x480 pixels,
LTDC Clock: 33.33 MHz
HyperFlash S26KL512 (64 MB) (set to memory mapped mode), running on OctoSPI1 with 70 MHz
HyperRAM (16 MB), running on OctoSPI2 with 70 MHz
Double Buffering enabled, RAM Buffers at 0x70000000 and 0x70200000
DMA2D enabled, Color Mode RGB888
ICache and DCache currently disabled
Versions of TouchGFX 4.21.4 and STMCubeMX 6.8.0. / HAL V. 1.11.0
The project is created using CubeMX with
- FreeRTOS enabled (CMSIS_V2)
- TouchGFX with Application Tick Source: LTDC, ChromART enabled
LTDC setup is copied from a running system we constructed 4-5 years ago with a STM32H743 processor and the same LCD panel, so this should be set correctly.
Unfortunately the TouchGFX handling of the previous system was not created using STMCubeMX as at that time this was not yet available. Source code therefore is simply comparable.
Except for the flickering problem the new system is working properly and is showing the correct screen after startup flicker is stabilized.
When switching to another screen, the new screen is having a cevere flicker of a kind of misaligned screen parts and after some 1/10th of a second the screen is ok and stable.
Can anyone help with suggestions?
And: Which settings should be used for DMA2D concerning Transfer Mode? Currently it is set to "Memory to Memory".
P.S: Adjusting the resolution to 832 x 480 as proposed by fitus in a similar post did not correct the problem!
Best regards
GS
