[riot-notifications] [RIOT-OS/RIOT] cpu, sam0_common: fix uart TXC check (#7638)

Sebastian Meiling notifications at github.com
Sat Sep 23 19:57:02 CEST 2017

>  I think the correct thing to do would be move the TXC spin check out of the loop, and just do it once after the whole buffer has been written.

Nice idea, I agree - and thanks for the detailed background info!

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