15.9.2.4.1 Workflow

  1. Create alarm struct and initialize the time with current time. 
    struct rtc_calendar_alarm_time alarm;
  2. Set alarm to trigger on seconds only. 
    alarm.mask = RTC_CALENDAR_ALARM_MASK_SEC;
  3. Add one second to the current time and set new alarm. 
    alarm.time.second += 5;
alarm.time.second = alarm.time.second % 60;

rtc_calendar_set_alarm(&rtc_instance, &alarm, RTC_CALENDAR_ALARM_0);