SPI Rx DMA with variable length data
Well, I believe I found a way to implement this...
I changed changed by CS pin to act as an external interrupt that triggers on the rising edge. I call my SPI DMA setup function as usual. Then when I receive the callback for this interrupt (ie CS has gone high), I call HAL_DMA_Stop(). The buffer I provided the DMA when setting it up now has my data in it.
I’m surprised no one else has had to deal with this before and that I couldn’t find any forums talking about it. I’ve tested it out with various sized buffers and everything appears to be working how I want. If anyone reading this, knows of a “gotcha” that I haven’t found yet, please let me know.
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