On Mon, Mar 31, 2014 at 09:54:03AM +0200, Gerhard Sittig wrote: > No progress here. > Eyeballing the code reveals that there is a 50 times 10-100us > retry loop at the end of a transfer, waiting for RX to complete > after TX has drained. Instrumenting the code shows that the loop > is run one or two times at most (longer timeouts are required for > lower SPI wire speeds). So I still can't see what might take > several milliseconds. Can you identify where in the code the delay is occurring (tracepoints are often good for that) or is it just generally slower?
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