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@Gordon
In the case of flip it should be reasonably easy - make it run in the background, but block if another
SPI.sendwas in progress. That way you could just put aSPI.send([])at the end to force it to wait for all the active sends to finish before returning.In terms of STM32 support, I'd look at the
tvlibrary - that uses DMA SPI for the TV output. However it's potentially a bit tricky choosing the correct DMA device in a way that works across all versions of STM32.Then there's nRF52 (and also STM32LL) as well - I believe there are some drivers that handle DMA'd SPI. Last time I looked there was a bug that meant that 1 byte sends failed, but in the newer SDKs I'm using now that's probably fixed.