88 lines
1.9 KiB
Text
88 lines
1.9 KiB
Text
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/* Demonstration of Rtc_Pcf8563 Alarms.
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*
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* The Pcf8563 has an interrupt output, Pin3.
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* Pull Pin3 HIGH with a resistor, I used a 10kohm to 5v.
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* I used a RBBB with Arduino IDE, the pins are mapped a
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* bit differently. Change for your hw.
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* SCK - A5, SDA - A4, INT - D3/INT1
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*
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* After loading and starting the sketch, use the serial monitor
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* to see the clock output.
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*
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* setup: see Pcf8563 data sheet.
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* 1x 10Kohm pullup on Pin3 INT
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* No pullups on Pin5 or Pin6 (I2C internals used)
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* 1x 0.1pf on power
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* 1x 32khz chrystal
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*
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* Joe Robertson, jmr
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* orbitalair@bellsouth.net
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*/
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#include <Wire.h>
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#include <Rtc_Pcf8563.h>
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/* get a real time clock object */
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Rtc_Pcf8563 rtc;
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/* a flag for the interrupt */
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volatile int alarm_flag=0;
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/* the interrupt service routine */
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void blink()
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{
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alarm_flag=1;
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}
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void setup()
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{
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pinMode(3, INPUT); // set pin to input
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digitalWrite(3, HIGH); // turn on pullup resistors
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Serial.begin(9600);
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/* setup int on pin 3 of arduino */
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attachInterrupt(1, blink, FALLING);
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/* clear out all the registers */
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rtc.initClock();
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/* set a time to start with.
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* day, weekday, month, century, year */
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rtc.setDate(14, 6, 3, 0, 10);
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/* hr, min, sec */
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rtc.setTime(1, 15, 40);
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/* set an alarm for 20 secs later...
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* alarm pin goes low when match occurs
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* this triggers the interrupt routine
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* min, hr, day, weekday
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* 99 = no alarm value to be set
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*/
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rtc.setAlarm(16, 99, 99, 99);
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}
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void loop()
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{
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/* each sec update the display */
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Serial.print(rtc.formatTime());
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Serial.print(" ");
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Serial.print(rtc.formatDate());
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Serial.print(" 0x");
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Serial.print(rtc.getStatus2(), HEX);
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Serial.print("\r\n");
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delay(1000);
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if (alarm_flag==1){
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clr_alarm();
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}
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}
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void clr_alarm()
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{
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detachInterrupt(1);
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Serial.print("blink!\r\n");
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rtc.clearAlarm();
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delay(1000);
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alarm_flag=0;
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attachInterrupt(1, blink, FALLING);
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}
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