Adafruit_ZeroDMA library 
DMA helper/wrapped for ATSAMD21 such as Arduino Zero & Feather M0
Current version of this library no longer requires Adafruit_ASFcore as a prerequisite. However...IT BREAKS COMPATIBILITY WITH PRIOR VERSIONS. Function names, calling sequence and return types/values have changed. See examples!
Item(s) in 'utility' directory are much pared-down derivatives of Atmel ASFcore 3 files. Please keep their original copyright and license intact when editing.