Add support for reading from USART using DMA #14
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I originally thought I'd need a separate trait for receiving, i.e. peripheral-to-memory transfers, but it looks like that's not going to be necessary.
We're going to need it to build a safe DMA API that is generic over the specific buffer type used.
This will theoretically allow us to use other types than `&'static [u8]`, like `Box<u8>` (I haven't checked, and given that a `Box` is hard to come by, it doesn't seem immdetialy relevant). What is immediately relevant, however, is that it allows us to use `'static mut [u8]`, which is going to be required when I add support for peripheral-to-memory transfers.
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Great to see RX DMA implemented, thanks @hannobraun! |
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This largely follow this guide from The Embedonomicon:
https://docs.rust-embedded.org/embedonomicon/dma.html