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Synchronizing SPI/DMA startup

Question asked by tonyrc on Mar 25, 2014
Haven't been able to find anyone discussing this. 
What I need to be able to do is synchronize the start of two DMA SPI transfers. The two SPI ports are running at the same clock rate, and I need an 'atomic' start to them both. i.e. first bit of each transfer occurs at the same time. 
Thanks in advance for any advice!