Can LTDC Be Used for RGB Display on OSD32MP1-RED?

[Majda KHALIFA]

Hi everyone,

I’m working on a project with the OSD32MP1-RED and want to use the LTDC interface to connect a parallel RGB display. The issue is that the required pins for LTDC don’t seem to be available on the RED board—they’re already assigned for Ethernet.

What’s confusing is that the device tree still includes configurations for LTDC.
So, I’m wondering:

Is it possible to remap these pins to use LTDC for the RGB display?

 

[Neeraj Dantu]

Majda,

The LTDC interface is used for HDMI on OSD32MP1-RED. Please take a look at Sheet 7 of rev 1.1 here: https://octavosystems.com/docs/osd32mp15x-red-schematic-pdf/ for LTDC connections to a HDMI Framer chip U3 as well as the Micro HDMI slot X6.

Best,
Neeraj

[Majda KHALIFA]

Is there any way to disable the HDMI functionality and reassign the LTDC pins for a parallel RGB display?

 

[Neeraj Dantu]

Majda,

Unfortunately, using LTDC as RGB will not be possible on OSD32MP1-RED board. However, there are options:

1. You can use the DSI display output with X8 or JP6(Sheet 9 of the schematics).
2. You can use ST’s EV1 dev board: https://www.st.com/en/evaluation-tools/stm32mp157f-ev1.html that has an RGB header. Any software developed on ST’s dev board can easily be ported to OSD32MP1 device with a DDR include file.

Best,
Neeraj

[Author]

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