[riot-notifications] [RIOT-OS/RIOT] cpu/stm32_common: prevent uart write stuck (#11107)

Toon Stegen notifications at github.com
Tue Mar 5 17:22:28 CET 2019

The I2C driver solves this the same way by using a tick in the busy loop:

and a driver constant:

To me it seems best to do it the same way here and add a return code to the API.

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