Working with RTC with OpenCM9.04

RTC Grove D1307 & mini RTC DS3231
Both RTC modules use address 0x68 (default) for I2C exchange.

Modification is needed in the sample from SetTimeAndDisplay (arduino) by setting the following:

1. // original function description deleted
2. /****************************************************************************/
3. #include <Wire.h>
4. #include "DS1307.h"
5. DS1307 clock;              //define a object of DS1307 class
6. void setup()
7. {
8.  SerialUSB.begin();
9.         Wire.begin(16,17);   //   specify the software defined I2C pins 16-SDA 17-SCL
10.                                   // clock.begin(); comment out original begin() method otherwise
11.                                   // pin21 (SDA) and pin20 (SCL) are declared in Wire
12.  clock.fillByYMD(2014,10,18);//Jan 19,2013
13.  clock.fillByHMS(15,15,30);//15:28 30"
14.  clock.fillDayOfWeek(SAT);//Saturday
15.  clock.setTime();//write time to the RTC chip
16. }
17. void loop()
18. {
19.  printTime();
20. }
21. /*Function: Display time on the serial monitor*/
22. void printTime()
23. {
24.  clock.getTime();
25.  SerialUSB.print(clock.hour, DEC);  // use SerialUSB class to print
26.  SerialUSB.print(":");
27.  SerialUSB.print(clock.minute, DEC);