RMT - Access to .is_done on SingleShotTxTransaction

[kokjo]

Motivations

Interrupt driven RMT channels, need access to .is_done so that we don't hang in an interrupt handler.

Solution

Access to .is_done or information about the channel status

Alternatives

None

[Dominaezzz]

I had a look at SingleShotTxTransaction and is_done can't really be provided on that because it does chunking and generally just a lot for you.

The long term solution seems to be something along the lines of #1768 but a non-blocking version of it, which will let you do interrupts.

So to summarize this issue is, "Provide a non-blocking version of SingleShotTxTransaction".