Workflow

1.
Set RTC period to 2000ms (two seconds) so that it will overflow and reset back to zero every two seconds.
```
rtc_count_set_period(&rtc_instance, 2000);
```
2.
Enter an infinite loop to poll the RTC driver to check when a comparison match occurs.
```
while (true) {
```
3.
Check if the RTC driver has found a match on compare channel 0 against the current RTC count value.
```
if (rtc_count_is_compare_match(&rtc_instance, RTC_COUNT_COMPARE_0)) {
```

Once a compare match occurs, perform the desired user action.

/* Do something on RTC count match here */
port_pin_toggle_output_level(LED_0_PIN);

Clear the compare match, so that future matches may occur.

rtc_count_clear_compare_match(&rtc_instance, RTC_COUNT_COMPARE_0);