Add asynchronous SPI transactions #2168
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Fixes #1192 Uses DMA operations to avoid the need to bit-bang or busy wait for SPI operations that might be very slow. Optional, adds new API calls to enable. Simple example included.
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Fixes #1192
Uses DMA operations to avoid the need to bit-bang or busy wait for SPI operations that might be very slow. Optional, adds new API calls to enable. Simple example included.