15.9.1.3.1 Workflow

  1. Start an infinite loop, to continuously poll for a RTC alarm match. 
    while (true) {
  2. Check to see if a RTC alarm match has occurred. 
    if (rtc_calendar_is_alarm_match(&rtc_instance, RTC_CALENDAR_ALARM_0)) {
  3. Once an alarm match occurs, perform the desired user action. 
    /* Do something on RTC alarm match here */
port_pin_toggle_output_level(LED_0_PIN);
  4. Clear the alarm match, so that future alarms may occur. 
    rtc_calendar_clear_alarm_match(&rtc_instance, RTC_CALENDAR_ALARM_0);