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mx25 LCD question

Question asked by Robert Bruce on Dec 9, 2015
Latest reply on Dec 9, 2015 by igorpadykov

I am attempting to bring-up a monochrome LCD on an i.MX25 platform with no OS.  I believe the pins, clocks, and LCD registers are programmed to reasonable values, but I am not getting any activity on the LCD pins (HSYNC, VSYNC, etc.).

 

I know that data is moved between the framebuffer memory and the LCD controller using DMA, but I am not sure how this DMA is accomplished.  Does the LCD controller handle the DMA operations, or is the DMA performed by the SDMA component?  Currently, I do not touch the SDMA registers.

 

I've read that u-boot can display a splash screen.  This would provide me with an example, but I have not been able to locate that code.  I'd appreciate some guidance.

 

Thanks.

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