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Nicholas Yunker_2
Senior
May 20, 2025
Solved

Interfacing STM32H735G-DK w/ 7" screen using EK9713CA Driver IC

  • May 20, 2025
  • 1 reply
  • 594 views

I started out by using the stock 4.3" display on the STM32H735G-DK Discovery Kit and with TouchGFX I was able to get a nice example project running.  Now I am attempting to interface a 7" 800x480 LCD panel with the kit.  This panel uses the EK9713CA driver IC.  The datasheet for the panel lists these timing characteristics:

NicholasYunker_2_0-1747777486354.png

Can some one please help me understand how to enter these into the LTDC configuration page on STM32CubeMX?  I've attempted to figure this out several different ways and I just keep getting a blank screen and the code just hangs during execution.  I suspect the issue is in the how I am entering these timings.



Best answer by Nicholas Yunker_2

I managed to get a better datasheet/app note from the manufacturer that named the timings better.  From that I was able to get the timings correct and the screen to work.  Here is a screenshot of the .ioc file that shows the correct settings:

NicholasYunker_2_0-1748636594728.png

NicholasYunker_2_1-1748636617286.png

 

 

1 reply

Nicholas Yunker_2
Senior
May 21, 2025

I have stepped through my code and find that it hangs when it reaches the backPorchExited() function in the TouchGFXHAL.cpp file

madGambol
Associate
May 30, 2025

Nicholas,

Would you mind sharing your ioc file?

Thanks,

Chris

Nicholas Yunker_2
Nicholas Yunker_2AuthorBest answer
Senior
May 30, 2025

I managed to get a better datasheet/app note from the manufacturer that named the timings better.  From that I was able to get the timings correct and the screen to work.  Here is a screenshot of the .ioc file that shows the correct settings:

NicholasYunker_2_0-1748636594728.png

NicholasYunker_2_1-1748636617286.png