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How to trigger sdma used gpmc whith hardware request automatically?

free bigfish
Prodigy 200 points

Hi,all.

    I want to trigger sdma over hardware(GPMC_DMA_REQ) automatically,not software.I configure gpmc as synchronous,16-bit address/data-multiplexed NOR flash likely(TRM 11.1.1.1).

    Did it need waitx signal?

   Can anyone give me some advice?

   Thanks first!