File content as of revision 49:243b5e826228:

#include "Rtc_Ds1307.h"
#include "math.h"
Rtc_Ds1307 rtc(I2C_SDA, I2C_SCL);
Rtc_Ds1307::Time_rtc tm_c = {};
int tm_a_hr, tm_a_min = 0;
char buffer[128];
int readptr = 0;

int date2day(int date,int month,int year){
    int m = ((((month + 9) % 12 + 1) * 2.6) - 0.2);
    int c = year / 100;
    int y = year % 100;
    int w = (date + m - 2 * c + y + y / 4 + (c / 4)) % 7;
    return w;
}

void read_time()
{
//  perform read
    int n = 0;
    do   {
        n++;
    } while(!rtc.getTime(tm_c));
    tm_c.wday = date2day(tm_c.date, tm_c.mon, tm_c.year);
}

void write()
{
//  perform write
    pc.printf("Enter the date (date 0..31)");
    pc.scanf("%d", &tm_c.date);
    pc.printf("Enter the date (month 1..12)");
    pc.scanf("%d", &tm_c.mon);
    pc.printf("Enter the date (year)");
    pc.scanf("%d", &tm_c.year);
    pc.printf("Enter the time (hours 0..23)");
    pc.scanf("%d", &tm_c.hour);
    pc.printf("Enter the time (minutes 0..59)");
    pc.scanf("%d", &tm_c.min);
    pc.printf("Enter the time (seconds 0..59)");
    pc.scanf("%d", &tm_c.sec);
    pc.printf("Performing write operation\n\r");

    while(pc.readable())

        pc.getc();
    int n = 0;
    while (!rtc.setTime(tm_c, true, false)) { //set the Time in RTC Param : ( Time container, Start Clock, Twelve Hour Clock)
        n++;
    }
    pc.printf("Tried to write %d times\n\r",n);
}

//other RTC functions:
//rtc.startClock();
//rtc.stopClock();
//square wave
//            int rs;
//            pc.printf("Please specify the frequency : [0 = 1Hz, 1 = 4.096kHz, 2 = 8.192kHz, 3 = 32.768kHz] ");
//            scanf("%d", &rs);
//            pc.printf("Enabling the output with %d option\n", rs);
//            rtc.setSquareWaveOutput(true, (Rtc_Ds1307::SqwRateSelect_t)rs);


//square wave off
//rtc.setSquareWaveOutput(false, Rtc_Ds1307::RS1Hz);