Provides abstraction for ATSAME54 series microcontrollers
- ATSAME54P20A core support
- ATSAME54 XPRO board support
- Example application
https://ww1.microchip.com/downloads/en/DeviceDoc/00002465A.pdf
https://github.com/arduino/ArduinoCore-samd/blob/master/libraries/SPI/SPI.cpp