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Commits on Nov 21, 2018
  1. Add basic support for SAMD51, used in M4 line from Adafruit (#662)

    balbinus authored and focalintent committed Nov 21, 2018
    * Add basic support for SAMD51, used in M4 line from Adafruit. Support is only based on Adafruit ItsyBitsy M4 Express, since it’s the only M4 board I have.
    
    * Pin verification from ItsyBitsy's variant.h + mixup between I2C and SPI