Freescale Semiconductor MCF5480 - Manual (Page 871)

Initialization Sequence
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor 28-17
/* Set I2CR.MTX to put the module in transit mode */
MCF_I2C_I2CR |= MCF_I2C_I2CR_MTX;
/* Send the contents of tx_buffer until NACK is detected */
i = 0;
while (1)
{
/*Put TX data into I2DR */
MCF_I2C_I2DR = tx_buffer[i];
/*Wait for transfer to complete */
while (!(MCF_I2C_I2SR & MCF_I2C_I2SR_IIF) );
/* Clear IIF bit */
MCF_I2C_I2SR &= 0xFD;
/*Detect when no ACK is received */
if(MCF_I2C_I2SR & MCF_I2C_I2SR_RXAK)
{
/*Finish the transfer by putting the module into its idle state. */
MCF_I2C_I2CR = 0x80;
break;
}
i++;
}
/*************************************************************************
* Slave RX illustrating dummy read of I2DR (interrupt function disabled) *
**************************************************************************/
/* Clear I2CR.MTX to put the module in receive mode */
MCF_I2C_I2CR &= 0xEF;
/* Dummy read of I2DR to signal the module is ready for the next byte */
dummy_read = MCF_I2C_I2DR;