File content as of revision 0:431183c5b136:

#include "mbed.h"
#include "Rtc_Ds1307.h"

DigitalOut myled(LED1);

Rtc_Ds1307 rtc(p28, p27);

Serial pc(USBTX, USBRX, "pc");

char buffer[128];
int readptr = 0;
int main() {
    char c;
    pc.printf("Good morning Henry\n");
    Time tm = {};
    
    while(1) {
        pc.printf("*************************************\n");
        pc.printf("* Menu for RTC Test :               *\n");
        pc.printf("* read  - reads the clock           *\n");
        pc.printf("* start - start the clock           *\n");
        pc.printf("* stop  - stop the clock            *\n");
        pc.printf("  write - write the clock           *\n");
        pc.printf("*************************************\n");
        
        while( (c = pc.getc()) != '\n') {
            buffer[readptr++] = c;
        }
        buffer[readptr++] = 0;
        if (strncmp(buffer, "read", 4) == 0) {
            //  perform read
            pc.printf("Performing read operation\n");
            if (rtc.getTime(tm) ) {
                pc.printf("The current time is : %02d:%02d:%02d\n", tm.hour, tm.min, tm.sec);
            }
            
        }
        else if (strncmp(buffer, "write", 5) == 0) {
            //  perform write
            pc.printf("Performing write operation\n");
        }
        else if (strncmp(buffer, "start", 5) == 0) {
            //  start
            pc.printf("Performing start operation\n");
        }
        else if (strncmp(buffer, "stop", 4) == 0) {
            //  stop
            pc.printf("Performing stop operation\n");
        }
        else {
            pc.printf("syntax error\n");
        }
        readptr = 0;
        pc.printf("\n\n\n");
    }
}