[riot-notifications] [RIOT-OS/RIOT] rtt_rtc: allow to use RTC emulation together with RTT alarms (#15763)

Francisco notifications at github.com
Tue May 18 10:37:19 CEST 2021

> The issues @MrKevinWeiss uncovered are real though, I also see this fail on my `nucleo-l031k6`.

@benpicco I don't quite understand the issues you point out, on what hardware can I reproduce?

>If we use the overflow callback, this frees up the alarm callback for direct use with the RTT API.

>This means that if an RTT provides the alarm callback and the user treads it as a monotonic counter (no calls to rtt_set_counter()), both rtc_rtt and the periph_rtt API can be used together.

>The user also must make sure to either use RTC or RTT alarms as they will overwrite each other.

Can all of this be documented somewhere?

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