[riot-notifications] [RIOT-OS/RIOT] cpu/stm32_common/periph/gpio: Pull-down on gpio_init_af (#12236)

マリウス notifications at github.com
Sun Sep 15 23:57:43 CEST 2019

Discussed this further with @benemorius, he suggested to simply change `GPIO_IN` to `GPIO_IN_PU` where the RX pin is being initialised. I tested this solution and it also seems to be working. It looks like this is the cleanest way to fix this issue as it does not apply to all pins but only to the UART RX pin.

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