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Black screen initial display start problem

Kyrpav
Associate III

I have an H755 nucleo board and a riverdi 5'' rgb display.

After

  • setting the ltdc ,
  • the clock to 25mhz
  • the freertos
  • not using qspi and sdram just by using the 2 layer start address 0x20000000 and 0x20119400 for RGB888
  • I have enabling the nvic
  • I have crosscheck the riverdi example for the ltdc setup and the polarities and everything is the same.
  • I have checked the +VLED and -VLED from the led driver it provides 12V and the rest of the system is on 3.3V.
  • I have opened the touchgfx and set only one red box as background.
  • I have set a blinking function to CM4 and to CM7 to be sure that all are working. Technically on CM7 where touchgfx runs before the MX_touchgfx_process() function  i just open the red led for some second and close it.  then the touchgfx_process runs.

The screen does not open. If i am not using qspi and sdram do i need to write something on how to send the data to the display pins? do i need to control something?

here is a link to the project (zipped):RiverdiH755 project 

 

Based on this image what should have been the proper framebuffer Starting address for the board?

 

Kyrpav_0-1706266487249.png

trying to check the pins:

Kyrpav_0-1706305583400.pngKyrpav_1-1706305593696.png

 

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