UCM-iMX8M-Mini MIPI DSI interface

Giovanni1 — Wed, 18 Oct 2023 11:31:42 GMT

Good day,

I am using the iMX8M on the UCM-iMX8M-Mini board and its Evaluation Kit from Compulab, with the LCD that it comes with plugged into the MIPI DSI interface.

Issue #1: At power-up, I can see activity on the MIPI DSI bus (DSI CLK and DSI data lane D0) when probing it with a scope. It is strange though that the waveforms I see on the scope are not in accordance with the LCD controller data sheet or the MIPI spec.

Issue #2: When I remove the LCD and connect the Evaluation Kit's MIPI DSI interface to my own custom hardware, the DSI stops working. There must therefore be some sort of start-up handshaking that takes place between the LCD controller and the iMX8. I am trying to figure out which device says what?

I need to know what default start-up transaction is happening so that I can either change the driver/s to just get the DSI high-speed data (which is the only thing I am really interested in for this application), or design my custom hardware to look like the LCD controller.

Any input on these issues would be greatly appreciated!

Many thanks,

Giovanni

i.MX ProcessorsのトピックUCM-iMX8M-Mini MIPI DSI interface

UCM-iMX8M-Mini MIPI DSI interface