[riot-notifications] [RIOT-OS/RIOT] board: add support for SAMR34-XPRO (#11250)

Alexandre Abadie notifications at github.com
Wed Jun 5 09:33:27 CEST 2019


@dylad, I retested this PR rebased on latest master and, except the problem with RTC, it works as expected.

Adding
```c
RTC->MODE2.CTRLA.bit.SWRST = 1;
while (RTC->MODE2.CTRLA.bit.SWRST) {}
```

at the beginning of `rtc_init` solves the issue but I'm not sure RTC should be reset by software all the time.

I tried setting the internal oscillator instead of the external one and it works. RTC precision seems good.

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