[riot-notifications] [RIOT-OS/RIOT] STM32_common/SPI: Reduce the overhead in the DMA hot path (#14097)

Koen Zandberg notifications at github.com
Tue May 19 13:23:45 CEST 2020


@MrKevinWeiss I'm unable to reproduce this on the stm32f401re unfortunately. I've directly connected the MOSI to the MISO line of `SPI_DEV(1)` and I don't see any erroneous output on both master and this PR. I strongly suspect 940aebdf88aacd555fc734c8938a28783f9c35d4 is to blame, but I'm not sure. It could also be 2be6351f5ee2b04e27cb70dc4ea4f82ccab5cd4c, but I consider that very unlikely.

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