File content as of revision 0:e2acb437847f:

#include "mbed.h"       
I2CSlave slave(D14,D15);                       //configuring pins p27, p28 as I2Cslave
Serial pc (USBTX,USBRX);
InterruptIn master_intrpt(D9);
 
DigitalOut slave_intrpt(D10);
 
int ack0 = 1;
int ack1 = 1;                               //read/write mode for i2c 0 : write2slave, 1 : write2master


char writedata;
char readdata;
 
void FUNC_I2C_WRITE2CDMS()
{
        
            slave.address(0x20);
            while(ack0==1)
            {       
            if(slave.receive()==1)
            {
                ack0=slave.write(&writedata,1);
               
                
            }
            else if(slave.receive()==3 || slave.receive()==2)
            {
                ack1=slave.read(&readdata,1);
            }
            }
            if(!ack0 )
           {
                printf("slave has written %c to slave\n\r",writedata);
                    //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
           }
            else
            {
            printf("\n\r data not written to slave \n");
            }
             if(!ack1 )
           {
                printf("slave has read %c to master \n \r",writedata);
                    //printf("\n \r %d %d %d %d %d\n",*data_reg,*status_reg,*c1_reg,*c2_reg,*freq_reg);
           }
            else
            {
            printf("\n\r data not read from master \n");
            }
}

        
void FUNC_INT()
{

    FUNC_I2C_WRITE2CDMS();
    slave_intrpt = 0;   
}
 


 
 
int main()
{   
    printf("\n slave started\n\r");
    
    master_intrpt.rise(&FUNC_INT);
    while(1)
    {
    writedata = pc.getc();
    slave_intrpt=1;
                
    }
     
}