I am using a DMA channel with autoinitialization.
I have a frame of 4 16-bit words.
My question is how I have to configure the DMA and the McBSP in order
to synchronize the DMA to the frame sync signal.
The problem is that the McBSP gives an event every 16-bit word and
this is not good because I have to start the DMA transaction at frame
sync (Every 4 16-bit words).