[riot-notifications] [RIOT-OS/RIOT] cpu/stm32_common: set RTS when uart is off (#11425)

Vincent Dupont notifications at github.com
Fri Apr 19 17:55:20 CEST 2019

### Contribution description

This PR sets RTS when powering off an UART if hardware flow control is used. It prevents the other end to send something while the UART is not ready. It's useful when powering off/on an UART while sleeping.

### Testing procedure

Power off UART, and check that RTS is set.

### Issues/PRs references

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-- Commit Summary --

  * cpu/stm32_common: set RTS when uart is off

-- File Changes --

    M cpu/stm32_common/periph/uart.c (16)

-- Patch Links --


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