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Sam4l usart new reg interface #766
Pull Request Overview
This pull request converts the SAM4L USART implementation to use the new Register interface.
It also extends the Register interface slightly, to better support the complex configurations the USART needs.
This pull request was tested by running an application that prints to the serial port and checking that it writes correctly.
TODO or Help Wanted
This pull request still needs a read-over/testing of the SPI part of the USART implementation. I was not sure how to test this.
There are some places where we could be making better use of the register system.