[riot-notifications] [RIOT-OS/RIOT] rtt_rtc: add rtc_settimeofday() & rtc_gettimeofday() (#16682)
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Mon Jul 26 16:53:21 CEST 2021
### Contribution description
The `rtt_rtc` module provided a RTC based on a RTT.
For some applications (e.g. NTP) it can be handy to set / get the epoch timestamp directly while still retaining the calendar alarm functionality.
This PR adds two functions `rtc_settimeofday()` and `rtc_gettimeofday()` to set/get the RTT timestamp with µs precision (rounded to the closest multiple of `1 / RTT_FREQUENCY`).
### Testing procedure
The unit test in `unittests/tests-rtt_rtc` was extended to cover the new functionality.
### Issues/PRs references
Examples: Fixes #1234. See also #5678. Depends on PR #9876.
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-- Commit Summary --
* rtt_rtc: add rtc_settimeofday() & rtc_gettimeofday()
* unittests: rtt_rtc: add test for rtc_get/settimeofday()
* rtt_rtc: fix rtc_get_time_ms()
-- File Changes --
M drivers/include/periph/rtc.h (24)
M drivers/rtt_rtc/rtt_rtc.c (32)
M tests/unittests/tests-rtt_rtc/tests-rtt_rtc.c (25)
-- Patch Links --
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