mx25 LCD question

rbruce — Wed, 09 Dec 2015 20:44:12 GMT

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.

Re: mx25 LCD question

fabio_estevam — Wed, 09 Dec 2015 21:29:17 GMT

The U-boot driver is drivers/video/imx25lcdc.c

Regards,

Fabio Estevam

Re: mx25 LCD question

igorpadykov — Thu, 10 Dec 2015 01:53:09 GMT

Hi Robert

i.MX25 LCD controller has own DMA engine, example of splashscreen can be found on

I.MX25 PDK U-boot SplashScreen

Best regards

igor

topic mx25 LCD question in i.MX Processors

mx25 LCD question

Re: mx25 LCD question

Re: mx25 LCD question