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IDMAC interference with other DMA sources

Question asked by Paul Hofmann on Mar 18, 2014
Latest reply on Mar 19, 2014 by Yuri Muhin

Hi there,

 

I currently have some trouble with my camera. I'm workin' with a iMX35 and I would like to stream pictures from a camera to the foreground layer of the IPU.

 

I'm using Windows CE 6 R3 and the Freescale standard IPU driver. I've set the direct display option in order to get the camera pictures directly transferred via IDMAC to the foreground (over SDC). Basically the transfer works. The camera input is being shown on my device. However, if the target resolution is VGA or above there are errors in the stream. And, the errors increase whenever other DMA interactions occure. For example, if I start the camera transfer and then produce traffic over ethernet the errors increase tremendously. So, my question is: is there a relationship between IDMAC (IPU) and SDMA? And if so, is there a prioritization mechanism in order to raise IDMACs priority? And if not, how could it be explained, that ethernet traffic affects the DMA of the IPU?

 

Any help would be appreciated.

 

Thanks in advance.

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