MATCH_SS: a one second timer

1

Dear All,

Maybe you have noticed, the MATCH_SS timer fires every minute. For those of you who want to use a one second timer, here is a small work around:

#include <RTCZero.h>

/* Create an rtc object */
RTCZero rtc;

/* Change these values to set the current initial time */
const byte seconds = 0;
const byte minutes = 00;
const byte hours = 0;

/* Change these values to set the current initial date */
const byte day = 1;
const byte month = 1;
const byte year = 1;

volatile bool IRQ_Timer;

int secs = 1;

void setup()
{
	while ((!SerialUSB) && (millis() < 5000)) 
	{
	}
	delay(3000);

	pinMode(2, OUTPUT);

	IRQ_Timer = false;

	rtc.begin();

	rtc.setTime(hours, minutes, seconds);
	rtc.setDate(day, month, year);
	rtc.enableAlarm(RTCZero::MATCH_SS);
	rtc.setAlarmSeconds(secs++);
	rtc.attachInterrupt(alarmMatch);
}

void loop()
{
	if (IRQ_Timer)
	{
		IRQ_Timer = false;

		rtc.setAlarmSeconds(secs);

		if (++secs == 60)
			secs = 0;

		SerialUSB.println(rtc.getAlarmSeconds());
	}

}

void alarmMatch()
{
	IRQ_Timer = true;
}

Have fun,

Axel