[riot-notifications] [RIOT-OS/RIOT] Update cpu/stm32/periph/rtc_all.c for CPU_FAM_STM32L5 support. (#16656)

aidiaz notifications at github.com
Mon Jul 19 00:02:26 CEST 2021


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### Contribution description

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Added `periph/rtc` support for `CPU_FAM_STM32L5`. 
### Testing procedure

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Run `tests/periph_rtc` with succesful outputs.
```
main(): This is RIOT! (Version: 2021.10-devel-169-g916dc-periph_rtc_l5)

RIOT RTC low-level driver test
This test will display 'Alarm!' every 2 seconds for 4 times
  Setting clock to   2020-02-28 23:59:57
Clock value is now   2020-02-28 23:59:57
  Setting alarm to   2020-02-28 23:59:59
   Alarm is set to   2020-02-28 23:59:59
  Alarm cleared at   2020-02-28 23:59:57
       No alarm at   2020-02-28 23:59:59
  Setting alarm to   2020-02-29 00:00:01

Alarm!
Alarm!
Alarm!
Alarm!
```
### Issues/PRs references

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DPB protection blocks the bit that clears RTC interrupt (has to be unlocked when clearing the CALRAF bit on RTC_SCR register), this wasn't adviced neither in the datasheet nor the errata document. 

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

  https://github.com/RIOT-OS/RIOT/pull/16656

-- Commit Summary --

  * Update rtc_all.c for CPU_FAM_STM32L5 support.

-- File Changes --

    M cpu/stm32/periph/rtc_all.c (43)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16656.patch
https://github.com/RIOT-OS/RIOT/pull/16656.diff

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