RE: Processor Technical Support (SR#: 0607855)

Question

Accepted Answer

Q 
 I'm using the SPI interface to access an SPI memory device using core and DMA accesses. When I switch between the core and DMA transfers I notice that DMA transaction transfers 8 bytes of garbage followed by the data. What could be wrong? 
 
 A 
 The correct way of enabling DMA for SPI transfers is to first enable the DMA and then enable the SPI controller. So if you're switching between core and DMA transfers then you would disable the SPI at the end of the core transfer and re-enable the SPI controller after you've enabled the DMA channel for DMA transfers.

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