Check for PDMIn DMA getting stuck. #916
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Tested on M4, which needs a larger counter limit because it's faster. But same hang happens on M4 as well. |
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The DMA transfer in PDMIn occasionally seems to lose a trigger from the I2S peripheral, and stops transferring. PDMIn record would hang waiting for DMA to finish. This puts a counter "timeout" on the number of times we check for DMA not being done. If the counter is exceeded, we give up and try again.
It would be nice to know why the trigger is being lost, but this prevents a hang, which is a lot better than nothing.
Sorta fixes #879.