Using DMA channels outside of piolib

[willgorman]

I'm trying to port the pico unicorn library to tinygo now that pio is supported but it uses DMA channels in a way that I'm not sure is currently allowed by the piolib package. I don't see anything exported from piolib that allows channels to be claimed and configured. Is DMA only intended to be used internally in piolib or would it be ok to submit a PR to export it?

[soypat]

Yes, for now it is only internal use. Ideally DMA should be in tinygo machine package. Need to consolidate this in future. Tagging @aykevl