rp: add support for double-buffered DMA transfers #4728
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I was trying to set up a Quectel LC86 GNSS receiver. It outputs a near-constant stream of UART data at 115200 bps, which is fast enough that other techniques for reading the data weren't fast enough (they resulted in constant overrun errors), so I needed a double-buffered DMA transfer.
embassydoesn't exactly expose all of the APIs needed to do this in user code, so I forked it and added it myself. What do y'all think?