if dma transfer fails, retry #4949
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This a fix to the issue:
[STM32] GPDMA ringbuffer #4858
What this does:
If write fails, try it again.
Circular ringbuffer has a bug, if it tries to write data to the ringbuffer, but its at the end of it, data doesnt fit, instead of writing to the buffer, data are just lost.
This is probably a workaround from an issue, that is deeper and I dont understand it. I just saw a problem, this fix fixed it perfectly, but its clearly a workaround(There shouldnt be a need for retry, if failed).