Adding support for the Arduino Zero / SAMD21
Hi there. I'm working on adding support for the Cortex-M0+ based SAMD21G18A used in the Arduino Zero, MKR1000, and other boards like the Adafruit Feather M0 series.
I'm pretty happy with it so far - there's watchdog, GPIO, and good enough UART support that I can set up a SLIP connection and ping the board.
Would you be interested in merging the port? I'm a bit new to git but I've tried to structure it as one-commit-per-feature at https://github.com/nzmichaelh/zephyr/commits/arduino_zero. If it looks roughly good then I'll send a pull request.