void handleI2C_master()
{
  	static uint8_t mode; 
while(1)
{
	 if((TWCR,TWINT))
	 {
		 {
			 switch(TW_STATUS)
			 {

				 
				 //case 0x10: // reapeated START condition has been transmitted
				 case 0x08: // A START condition has been transmitted
				 
				 t_index =0;
				 r_index =0;
				 
				 status_TWI();
				 //send SLA W or R depending on what mode we want.
				 if(mode == TW_WRITE) TWDR = ((address) | TW_WRITE);
			 
				 //else TWDR = SLA_R;
				 TWACK;
				 break;
				 
				 
				 //--------------- Master transmitter mode-------------------------
				 
				 case 0x18: // SLA_W has been transmitted and ACK has been received
				 
				 //load data
				 TWDR = tran[data];
				 t_index=1;
				 TWACK;
				 break;
				 
				 //SLA_W not acked, 
				 case 0x20:
				 TWCR =0;
				 TWSTART;
				 break;
				 case 0x28: //data acked by addressed receiver
				 //load next byte
				 if(t_index < BUFLEN_TRAN)
				 {
					 TWDR =  tran[t_index];
					 t_index++;
					 TWACK;
					 break;
				 }
				 //switch mode and send a start signal
				 else
				 {
					 mode = TW_READ;
					 TWSTART;
					 break;
				 }
				 case 0x38: //arbitration lost
				 //data nacked, start over
				 case 0x30:
				 TWCR = 0;
				 TWSTART;
				 break;
				 
				  case 0x10: // reapeated START condition has been transmitted
				break;				 

			 }
			 
		 }	
			
	}	
		
		data = 0x08;
	}
}