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KMew
KMew
Senior III
February 8, 2023
Solved

LTDC: Display Compatibility Question

  • February 8, 2023
  • 1 reply
  • 1956 views

Hello,

I am looking to use the LTDC (LCD-TFT) feature to interface with a TFT display and potential touch controllers (CTP). I am uncertain on the requirements to interface with it and wanted to confirm a few details.

I have written software (generated by TouchGFX) that works with the STM32H7B3I-EVAL evaluation board. It utilizes a Rocktech display (RK070ER9427-CT).

For our application, we want to use Rocktech as well, but just a smaller screen. Therefore, we are using their RK043FN66HS-CTG. The only mentioned difference is that the 9427 utilizes a different touch controller than the 66HS, so a new driver for that will have to be written. That I understand. I also understand that the pinout is different between the two displays, but they both still have the common pins (R0-7, G0-7, B0-7, HSYNC, VSYNC, DE, CLK).

What I am unsure of is if there's a "LCD-TFT" driver that's device specific. For example, if I have a firmware working with the 9427, then change the resolution in the LTDC configuration (800x480 to 480x272) and change the hardware to match the pinout of the 66HS, will it work with the 66HS? Or is there more to consider than that?

This topic has been closed for replies.
Best answer by Osman SOYKURT

Hello KMew,

I think there's more to consider. As I can see in the datasheet the RK043FN66HS-CTG uses also a ST7282 Drive IC for TFT, which is not used in the RK070ER9427-CTG. There might be also some clock configuration to consider as you need to render smaller screen now. But it shouldn't be too difficult to change screen and actually you can get inspiration from the STMH7B3i-disco TBS in which there's also a Rocktech display (RK043FN48H-CT672B) but it includes a OTA5180A Drive IC.

Hope that helps

/Osman

1 reply

Osman SOYKURT
Osman SOYKURTBest answer
ST Technical Moderator
February 9, 2023

Hello KMew,

I think there's more to consider. As I can see in the datasheet the RK043FN66HS-CTG uses also a ST7282 Drive IC for TFT, which is not used in the RK070ER9427-CTG. There might be also some clock configuration to consider as you need to render smaller screen now. But it shouldn't be too difficult to change screen and actually you can get inspiration from the STMH7B3i-disco TBS in which there's also a Rocktech display (RK043FN48H-CT672B) but it includes a OTA5180A Drive IC.

Hope that helps

/Osman

ST Software Developer | TouchGFX
KMew
KMewAuthor
Senior III
February 9, 2023

Hello Oskt,

Thank you for the reply. I am a little confused by what you mean. Are you saying that, even if I modify the hardware changes between the two displays, I cannot get it to work? Since you are recommending that I change screens. This is supposed to be a TFT compatible screen. Am I misunderstanding?

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