HAL for working with atsamc devices

This crate provides a type-safe API for working with atsamc21 based devices. Currently this crate supports atsamc21n18a (selectable via the samc21n18a features), and should be able to support other variants in a similar fashion; pull requests for this are welcomed!

Examples?

Check out the samc21n_xplained_pro board support crate examples:

https://github.com/sordfish/atsamc/tree/master/samc21n_xplained_pro/examples