Display flickering STM32F746

Chandan Bhatia1 · ‎2021-01-03

Hello, I am using STM32F746 with FMC SDRAM, QSPI flash, DMA2D. I observed my display is flicking. You can check video using below link.

Any suggestions for solving this issue.

I am using custom board with MCU 746 with below software with version :

Thanks

Slh · ‎2021-01-03

Change (reduce) the LCD-Clock Speed and test.

Chandan Bhatia1 · ‎2021-01-04

I tried.. Kinda same

EEuge · ‎2021-01-04

Move widget, which is flickering, to top, above other widgets

Like this

Chandan Bhatia1 · ‎2021-01-04

@EEuge If you will check video, everything is kinda flickering.

Alexandre RENOUX · ‎2021-01-04

Hello Chandan Bhatia,

From the look of your video, I suppose that you have created your project from scratch with a custom display.

I believe it's related to the DMA2D. First check your MPU settings.

Also uncomment all the lines where you have SCB_CleanInvalidateDCache(); (They should be located in STM32DMA.cpp and TouchGFXHAL.cpp).

/Alexandre

Chandan Bhatia1 · ‎2021-01-04

@Alexandre RENOUX Hi, I am using custom board with MCU 746 with below software with version :

Below are the settings for DMA2D

In My project, I searched for SCB_CleanInvalidateDCache(), but I am not directly calling it anywhere.

I didn't enable MPU. Check my system view.

Alexandre RENOUX · ‎2021-01-04

MPU needs to be enabled. Please refer to the Application Template F746-DISCO available in TouchGFX Designer.

/Alexandre

Chandan Bhatia1 · ‎2021-01-04

Which MPU setting should I choose? Also I enabled DMA2D but below ART accelerator is disabled. Is this fine?

EEuge · ‎2021-01-04

Upload your project here. It seems, I know course of your flicker...