Add DMA support for USART #12
Merged
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I've started implemented DMA support for USART. I'm submitting this as a draft, as it's not done yet.
Currently, only writing to USART via DMA is supported. Next week, I plan to implement reading from USART and add support for DMA interrupts.
@mvertescher If you have any thoughts so far, I'd love to hear them. I realize this is a complex API, but I believe the complexity is required to prevent incorrect use of the DMA peripheral through the HAL API.