[riot-notifications] [RIOT-OS/RIOT] cpu/efm32: RTC Series 0: use RTC helper functions (#15413)

benpicco notifications at github.com
Mon Nov 9 18:02:52 CET 2020


### Contribution description

By using the RTC helper functions instead of POSIX `mktime()`/`gmtime()` we can not only extend the RTC range beyond Y2038.

For tests/periph_rtc:

#### before:

```
   text	   data	    bss	    dec	    hex	filename
  28028	    248	   2472	  30748	   781c stk3700/tests_periph_rtc.elf
```

#### after:

```
   text	   data	    bss	    dec	    hex	filename
  19400	    144	   2424	  21968	   55d0 stk3700/tests_periph_rtc.elf
```

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### Testing procedure

`tests/periph_rtc` should still run on Series 0 MCUs.


### Issues/PRs references


fixes #13277


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

  https://github.com/RIOT-OS/RIOT/pull/15413

-- Commit Summary --

  * cpu/efm32: RTC Series 0: use RTC helper functions

-- File Changes --

    M cpu/efm32/periph/rtc_series0.c (10)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15413.patch
https://github.com/RIOT-OS/RIOT/pull/15413.diff

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