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SDMA Question

Question asked by yunteng long on Nov 23, 2018
Latest reply on Nov 23, 2018 by igorpadykov

Hi Everyone:

I want to use DMA copy data from external memory to internal memory in Linux 3.0.35/Linux 4.1.15 and I.MX6Q board.

I haved config DISP0_DAT17 for sdma_ext_event(It is invalid when I config GPIO18).

Now I encounter some problems.

After i config dma, i trigger dma with a pulse. From the values that I read  from EP and DMA Requests register I can know that DMA request has been received.But I can not receive callback.When i stop trigger dma, the value i read from EP register remains unchanged.I think it means DMA is not done.So, How can it be done if the read fifo has been full?

Best regards.