1 | /*****************************************************************************************************************************************************************************
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2 | * This sketch demonstrate how to use alarm in interrupt mode.
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3 | This mode is more conveniently because you use processor for other tasks and when alarm match occurs interrupt routine is executed.
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4 | In this way, alarm flag checking is indipendent from main program flow.
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5 |
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6 | NOTE: for M0/M0 pro only you can select the oscillator source for count.
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7 | If you want to use a low power oscillator use rtc.begin(TIME_H24, LOW_POWER); function.
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8 | If you want to use a more accurate oscillator use rtc.begin(TIME_H24, HIGH_PRECISION); function.
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9 | ******************************************************************************************************************************************************************************/
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10 |
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11 |
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12 | #include <RTCInt.h>
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13 |
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14 | RTCInt rtc;
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15 |
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16 | void setup()
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17 | {
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18 | Serial.begin(9600); //serial communication initializing
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19 | pinMode(13,OUTPUT);
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20 | rtc.begin(TIME_H24); //RTC initializing with 24 hour representation mode
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21 | rtc.setTime(17,0,5,0); //setting time (hour minute and second)
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22 | rtc.setDate(13,8,15); //setting date
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23 | rtc.enableAlarm(SEC,ALARM_INTERRUPT,alarm_int); //enabling alarm in polled mode and match on second
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24 | rtc.time.hour=17;
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25 | rtc.time.minute=5;
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26 | rtc.time.second=10; //setting second to match
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27 | rtc.setAlarm(); //write second in alarm register
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28 | }
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29 |
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30 | void loop()
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31 | {
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32 | digitalWrite(13,HIGH); //main program code
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33 | delay(100);
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34 | digitalWrite(13,LOW);
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35 | delay(900);
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36 |
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37 | }
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38 |
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39 |
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40 | /*************** Interrupt routine for alarm ******************************/
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41 | void alarm_int(void)
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42 | {
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43 | Serial.println("Alarm match!");
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44 | for(int i=0; i < 10; i++)
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45 | {
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46 | digitalWrite(13,HIGH);
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47 | //delay(200);
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48 | for(int j=0; j < 1000000; j++) asm("NOP"); //in interrupt routine you cannot use delay function then an alternative is NOP instruction cicled many time as you need
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49 | digitalWrite(13,LOW);
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50 | //delay(800);
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51 | for(int j=0; j < 2000000; j++) asm("NOP");
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52 | }
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53 | RTC->MODE2.INTFLAG.bit.ALARM0=1; //clearing alarm0 flag
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54 | }
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