Workflow

1.
Start an infinite loop, to continuously poll for a RTC alarm match.
```
while (true) {
```

Check to see if a RTC alarm match has occurred.

if (rtc_calendar_is_alarm_match(&rtc_instance, RTC_CALENDAR_ALARM_0)) {

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);

Clear the alarm match, so that future alarms may occur.

rtc_calendar_clear_alarm_match(&rtc_instance, RTC_CALENDAR_ALARM_0);