[riot-notifications] [RIOT-OS/RIOT] cpu/stm32_common: remove WKUP2 pin enable (#11167)

Francisco notifications at github.com
Tue Mar 12 16:43:16 CET 2019


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### Contribution description

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Currently StandBy mode is unusable for nucleo l0 boards. When looking at the datasheet:

> WKUP pin 2 is used for wakeup from Standby mode and forced in input pull down
configuration (rising edge on WKUP pin 2 wakes-up the system from Standby mode).

But when looking at the boards schematic PC13 (wake-up pin 2), is also the user button which is connected to VDD, this means that unless user is holding the user button pressed all the time, a rising edge is triggered immediately. More so, it leaves the MCU in a weird state after reset.

Not enabling wake up pin 2 when entering StandBy fixes the issue.

### Testing procedure

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On nucleo boards that support LPM run:

`make BOARD=nucleo-l073rz -C tests/periph_pm/ PORT=/dev/ttyACM0 clean flash`
`unblock 0`
`unblock 1`
`unblock_rtc 1 3`

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11167

-- Commit Summary --

  * cpu/stm32_common: remove WKUP2 pin enable

-- File Changes --

    M cpu/stm32_common/periph/pm.c (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11167.patch
https://github.com/RIOT-OS/RIOT/pull/11167.diff

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