/**
* \brief Configures a TWI peripheral to operate in slave mode.
* \param pTwi Pointer to an Twi instance.
* \param slaveAddress Slave address.
*/
void TWI_ConfigureSlave(Twi *pTwi, uint8_t slaveAddress)
{
uint32_t i;
/* TWI software reset */
pTwi->TWI_CR = TWI_CR_SWRST;
pTwi->TWI_RHR;
/* Wait at least 10 ms */
for (i=0; i < 1000000; i++);
/* TWI Slave Mode Disabled, TWI Master Mode Disabled*/
pTwi->TWI_CR = TWI_CR_SVDIS | TWI_CR_MSDIS;
/* Configure slave address. */
pTwi->TWI_SMR = 0;
pTwi->TWI_SMR = TWI_SMR_SADR(slaveAddress);
/* SVEN: TWI Slave Mode Enabled */
pTwi->TWI_CR = TWI_CR_SVEN;
/* Wait at least 10 ms */
for (i=0; i < 1000000; i++);
assert( (pTwi->TWI_CR & TWI_CR_SVDIS)!= TWI_CR_SVDIS ) ;
}
/**
* \brief Initialize TWI slave mode.
*
* \param p_twi Pointer to a TWI instance.
* \param ul_device_addr Device address of the SAM slave device on the I2C bus.
*/
void twi_slave_init(Twi *p_twi, uint32_t ul_device_addr)
{
/* Disable TWI interrupts */
p_twi->TWI_IDR = ~0UL;
p_twi->TWI_SR;
/* Reset TWI */
twi_reset(p_twi);
/* Set slave address in slave mode */
p_twi->TWI_SMR = TWI_SMR_SADR(ul_device_addr);
/* Enable slave mode */
twi_enable_slave_mode(p_twi);
}
/**
* \brief Set TWI slave address.
*
* \param p_twi Pointer to a TWI instance.
* \param ul_device_addr Device address of the SAM slave device on the I2C bus.
*/
void twi_set_slave_addr(Twi *p_twi, uint32_t ul_device_addr)
{
/* Set slave address */
p_twi->TWI_SMR = TWI_SMR_SADR(ul_device_addr);
}
