Often in transparent areas, in random locations, false pixels can appear. can cause such a problem?

[Soner]

attached video.

STM32F429

TFT 1024x600

[Alexandre RENOUX]

Hello Sozde.1,

Do you have the same issue on the simulator ? Also can you try see what is invalidated when running the simulator ? (press F2 when the simulator is running)

F429 is not powerful enough to be used efficiently with huge display like 1024x600. I don't know if it could have an impact in your case but it's important to take that into account.

Your display is an LTDC display ? Please provide more information about your current setup (software versions, board, external flash, external ram, etc.)

/Alexandre

[Soner]

Dear Alexandre,

simulator works normally.

I did not observe any changes with the F2 key.

We use our own coreboard.

CPU STM32F429IET

SRAM IS42S16400J-7TLI

FHASH M29W256GL70N6

TFT ‎NHD-10.1-1024600AF-ASXV#-CTP-ND‎ 10.1" TFT w/CAPTOUCH

We used it on a 7 inch screen (800x480) before. there was no problem.

We are currently planning to test with STM32F746IET.

we couldn't understand my hardware or software problem!

What do you recommend. thanks.

[Soner]

Keil v5.29 (ARM Compiler v5.06 update 6 (build750)

TouchGFX Designer 4.15.0

[Alexandre RENOUX]

Hello Soner,

Did you check your clocks ? What's your display clock speed ? Are your framebuffers in external SRAM ? What's the bandwidth of this SRAM ? Same for Flash.

I suspect your clock frequencies are two low and the bandwidth is limited.

/Alexandre