File content as of revision 0:cdc20d6056de:

#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 master_status_write = true;
            bool master_status_read = true;
            char* data_send =  new char;
            *data_send = 'b';
            char *data_rec =  new char;
            *data_rec = 'b';
            bool write_loop = true;
            bool read_loop = true;
            while(write_loop){
                printf("2 master clk freq setup and addressing slave\n\r");
                master.frequency(100000);                       //set clock frequency
                master.start();                                 //initiating the data transfer
                master_status_write = (bool) master.write(addr|0x00,data_send,1);
                if(!master_status_write){
                    printf("3 master has written %c to slave\n\r",*data_send);
                    write_loop=false;
                }
            }
            printf("done\n\r");
            
            
            while(read_loop){
                printf("4 master clk freq setup and addressing slave\n\r");
                master.frequency(100000);                       //set clock frequency
                master.start();                                 //initiating the data transfer
                master_status_read = (bool) master.read(addr,data_rec,1);
                if(!master_status_read){
                    printf("5 master has read %c from slave\n\r",*data_rec);
                    read_loop=false;
                }
            }
            printf("done\n\r");
        }
    }
}