void initTwi( void )
{
	/* Define TWD and TWCK as peripherals lines */
	pPIOA->PIO_PDR = AT91C_PA11_TWCK | AT91C_PA10_TWD;
	pPIOA->PIO_ASR = AT91C_PA11_TWCK | AT91C_PA10_TWD; 		
	pPIOA->PIO_BSR = 0;                                		

    /* Enable the clock of the TWI */
	pPMC->PMC_PCER = (1U << AT91C_ID_TWI);

	/* Disable interrupts */
	pTWI->TWI_IDR = (unsigned int) -1;

	/* Reset peripheral */
	pTWI->TWI_CR = AT91C_TWI_SWRST;

	/* Set the TWI clock to 100 KHz */
	AT91F_SetTwiClock();

    /* Enable TWI controller */
    pTWI->TWI_CR = AT91C_TWI_MSEN;

}