File content as of revision 1:8e4b5e1f8039:

#include "mbed.h"

const int addr = 0x20;                     //slave address 
I2C master (D14,D15);                      //configure pins p27,p28 as I2C master
Serial pc (USBTX,USBRX);

void main()
{
    printf("press backspace for master to start \n\r");
    while(1){
        if(pc.getc()==8){
            bool ack0 =true; 
            char *data =  new char;
            *data = 'b';
            bool loopvariable0 = true;
             master.frequency(100000);                       //set clock frequency
             //master.start();
            while(ack0){
                //printf("2 master clk freq setup and addressing slave\n\r");
               
                master.start();                                 //initiating the data transfer
                ack0 = (bool) master.read(addr,data,1);}
                if(!ack0){
                    printf("3 master has read %c from slave\n\r",*data);
                    loopvariable0=false;
                }
            }
            printf("done\n\r");
        }
    }