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Hold off DMA transfer

Hi,

 

 I have a DMA connected to a SPI driver. The device on the other end of the SPI bus (the slave) gives a sync signal telling when data it is outputiing is valid (As it outputs trash before before hand). I was wondering how can I suspend the DMA transfer based on the sync signal?!. Any data already in the DMA should still be sent to the host even if its input is suspended at a give time.

 

Hopefully this question is clear ;0

 

Thanks 😉

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