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

Sebastian Meiling notifications at github.com
Fri Sep 22 09:55:49 CEST 2017

should fix #7617, and also adapts some register checks to use read-only bits where possible.

Tested with `samr21-xpro`. @travisgriggs please try this one and verify if that resolves your issue reported in #7617.
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-- Commit Summary --

  * cpu, sam0_common: fix uart TXC check

-- File Changes --

    M cpu/sam0_common/periph/uart.c (28)

-- Patch Links --


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