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a6b8f3d994
with uniform treatment of adc inputs it's easy enough to add a new sampling method. dma sampling only supports one channel at the moment, though round-robin sampling would be a simple extension (probably a new trait that's implemented for Channel and &[Channel]). continuous dma as proposed in #1608 also isn't done here, we'd expect that to be a compound dma::Channel that internally splits a buffer in half and dispatches callbacks or something like that.