[riot-notifications] [RIOT-OS/RIOT] sys/ztimer: add ZTIMER_SEC (#15715)

Kaspar Schleiser notifications at github.com
Thu Jan 7 11:17:14 CET 2021

Long overdue! But I think we should try to not use RTC. On most platforms, it shares the same hardware with RTT anyways (requiring to chose one). Also the RTC interface is clumsy to use if only a seconds granularity counter is desired (like in this case).

So, please change to use RTT as preference (possibly a converted ZTIMER_MSEC), and only fall back to RTC if no RTT is available.

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