* This uses a new closure-based method to the DMA HAL implementation which
gives access to the inactive buffer directly.
* It removes changing addresses, the third buffer for DBM, the inactive
address poisoning, and allows the cancellation of the redundant repeat
memory barriers and compiler fences.
* This is now around 20 instructions per buffer down from about 100 cycles
before.
* Also introduces a new `SampleBuffer` type alias.
* The required unpacking of the resources structure is a bit annoying
but could probably abstraced away.
TODO:
* Test
* Adapt `lockin`
Robert Jördens
Ryan Summers