[riot-notifications] [RIOT-OS/RIOT] cpu/efm32/uart: enable pullup on RX pin (#12279)

Thomas Stilwell notifications at github.com
Fri Sep 20 05:36:38 CEST 2019


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### Contribution description
Similar to #12236, this enables the pullup resistor on the UART RX pin. This is to fix the undefined behavior that results when the RX pin is floating.
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### Testing procedure
Confirm that a UART shell still works as intended.

To test that this PR effects a beneficial change, use the test in https://github.com/RIOT-OS/RIOT/pull/12236#issuecomment-531613204. In fact the results I posted there were from an efm32 board.
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### Issues/PRs references
This does for efm32 what #12236 did for stm32.
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12279

-- Commit Summary --

  * cpu/efm32/uart: enable pullup on RX pin

-- File Changes --

    M cpu/efm32/periph/uart.c (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12279.patch
https://github.com/RIOT-OS/RIOT/pull/12279.diff

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