/**
* \brief Write multiple bytes to a TWI compatible slave device
*
* \param twim Base address of the TWIM (i.e. &AVR32_TWIM).
* \param *buffer Data to be transmitted
* \param nbytes Number of bytes to be transmitted
* \param saddr Slave address
* \param tenbit Ten bit addressing
* \retval STATUS_OK If all bytes were send successfully
* \retval ERR_IO_ERROR NACK received or Bus Arbitration lost
*/
status_code_t twim_write (volatile avr32_twim_t *twim, uint8_t const *buffer,
uint32_t nbytes, uint32_t saddr, bool tenbit)
{
// Reset the TWIM module to clear the THR register
twim->cr = AVR32_TWIM_CR_MEN_MASK;
twim->cr = AVR32_TWIM_CR_SWRST_MASK;
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
// Set pointer to TWIM instance for IT
twim_inst = twim;
// Disable the TWIM interrupts
twim_disable_interrupt (twim_inst);
// get a pointer to applicative data
twim_tx_data = buffer;
// set the number of bytes to transmit
twim_tx_nb_bytes = nbytes;
// Set next transfer to false
twim_next = false;
// Initialize bus transfer status
transfer_status = TWI_SUCCESS;
// set the command to start the transfer
twim_inst->cmdr = (saddr << AVR32_TWIM_CMDR_SADR_OFFSET)
| (nbytes << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| ((tenbit ? 1 : 0) << AVR32_TWIM_CMDR_TENBIT_OFFSET)
| (0 << AVR32_TWIM_CMDR_READ_OFFSET);
// mask NACK and TXRDY interrupts
twim_it_mask = AVR32_TWIM_IER_NAK_MASK | AVR32_TWIM_IER_TXRDY_MASK;
// update IMR through IER
twim_inst->ier = twim_it_mask;
// Enable master transfer
twim_inst->cr = AVR32_TWIM_CR_MEN_MASK;
// Enable all interrupts
cpu_irq_enable ();
// send data
while (!(transfer_status) && !(twim_status ())) {
cpu_relax();
}
#if AVR32_TWIM_H_VERSION > 101 // Removed in twim100 module due to IC bug
// Disable master transfer
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
#endif
if (transfer_status == TWI_RECEIVE_NACK
|| transfer_status == TWI_ARBITRATION_LOST) {
return ERR_IO_ERROR;
}
return STATUS_OK;
}
/**
* \brief Read multiple bytes from a TWI compatible slave device
*
* \param twim Base address of the TWIM (i.e. &AVR32_TWIM)
* \param *buffer Received data
* \param nbytes Number of bytes to be transmitted
* \param saddr Slave address
* \param tenbit Ten bit addressing
* \retval STATUS_OK If all bytes were read successfully
* \retval ERR_IO_ERROR NACK received or Bus Arbitration lost
*/
status_code_t twim_read (volatile avr32_twim_t *twim, uint8_t *buffer,
uint32_t nbytes, uint32_t saddr, bool tenbit)
{
// Reset the TWIM module to clear the THR register
twim->cr = AVR32_TWIM_CR_MEN_MASK;
twim->cr = AVR32_TWIM_CR_SWRST_MASK;
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
// Set pointer to TWIM instance for IT
twim_inst = twim;
// Disable the TWIM interrupts
twim_disable_interrupt (twim_inst);
// get a pointer to applicative data
twim_rx_data = buffer;
// get a copy of nb bytes to read
twim_rx_nb_bytes = nbytes;
// Set next transfer to false
twim_next = false;
// Initialize bus transfer status
transfer_status = TWI_SUCCESS;
//tenbit need special handling
if (tenbit) {
twim_inst->cmdr = (saddr << AVR32_TWIM_CMDR_SADR_OFFSET)
| (0 << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (0 << AVR32_TWIM_CMDR_STOP_OFFSET)
| (AVR32_TWIM_CMDR_TENBIT_MASK)
| (0 << AVR32_TWIM_CMDR_READ_OFFSET);
twim_inst->ncmdr = (saddr << AVR32_TWIM_CMDR_SADR_OFFSET)
| (nbytes << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| (AVR32_TWIM_CMDR_TENBIT_MASK)
| (AVR32_TWIM_CMDR_REPSAME_MASK)
| (AVR32_TWIM_CMDR_READ_MASK);
} else {
twim_inst->cmdr = (saddr << AVR32_TWIM_CMDR_SADR_OFFSET)
| (nbytes << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| (0 << AVR32_TWIM_CMDR_TENBIT_OFFSET)
| (AVR32_TWIM_CMDR_READ_MASK);
}
// mask NACK and RXRDY interrupts
twim_it_mask = AVR32_TWIM_IER_STD_MASK | AVR32_TWIM_IER_RXRDY_MASK;
// update IMR through IER
twim_inst->ier = twim_it_mask;
// Enable master transfer
twim_inst->cr = AVR32_TWIM_CR_MEN_MASK;
// Enable all interrupts
cpu_irq_enable ();
// get data
while (!(transfer_status) && !(twim_status ())) {
cpu_relax();
}
// Disable master transfer
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
//Check for nack
if (transfer_status == TWI_RECEIVE_NACK
|| transfer_status == TWI_ARBITRATION_LOST) {
return ERR_IO_ERROR;
}
return STATUS_OK;
}
/**
* \brief Write multiple bytes to a TWI compatible slave device
*
* \param twim Base address of the TWIM (i.e. &AVR32_TWIM)
* \param *package Package information and data
* (see \ref twim_package_t)
* \retval STATUS_OK If all bytes were send successfully
* \retval ERR_IO_ERROR NACK received or Bus Arbitration lost
*/
status_code_t twim_write_packet (volatile avr32_twim_t *twim,
const twim_package_t *package)
{
// Reset the TWIM module to clear the THR register
twim->cr = AVR32_TWIM_CR_MEN_MASK;
twim->cr = AVR32_TWIM_CR_SWRST_MASK;
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
// Set pointer to TWIM instance for IT
twim_inst = twim;
// Disable the TWIM interrupts
twim_disable_interrupt (twim_inst);
// Initialize bus transfer status
transfer_status = TWI_SUCCESS;
// mask NACK and TXRDY interrupts
twim_it_mask = AVR32_TWIM_IER_STD_MASK | AVR32_TWIM_IER_TXRDY_MASK;
// Set next transfer to false
twim_next = false;
//check if internal address access is performed
if (package->addr_length) {
// selection of first valid byte of the address
twim_tx_data = (uint8_t *) (&(package->addr));
twim_tx_data += (4 - package->addr_length);
// set the number of bytes to transmit
twim_tx_nb_bytes = package->addr_length;
// set next transfer to true
twim_next = true;
// Set the number of bytes & address for next transfer
twim_package = package;
} else {
// get a pointer to applicative data
twim_tx_data = package->buffer;
// get a copy of nb bytes to write
twim_tx_nb_bytes = package->length;
}
// initiate the transfer to send the data
twim->cmdr = (package->chip << AVR32_TWIM_CMDR_SADR_OFFSET)
| ((package->length + package->addr_length)
<< AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| (0 << AVR32_TWIM_CMDR_READ_OFFSET);
// update IMR through IER
twim_inst->ier = twim_it_mask;
// Enable master transfer
twim_inst->cr = AVR32_TWIM_CR_MEN_MASK;
// Enable all interrupts
cpu_irq_enable ();
// send data
while (!(transfer_status) && !(twim_status ())) {
cpu_relax();
}
#if AVR32_TWIM_H_VERSION > 101 //Removed in twim100 module due to IC bug
// Disable master transfer
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
#endif
// Check for nack
if (transfer_status == TWI_RECEIVE_NACK
|| transfer_status == TWI_ARBITRATION_LOST) {
return ERR_IO_ERROR;
}
return STATUS_OK;
}
/**
* \brief Read multiple bytes from a TWI compatible slave device
*
* \param twim Base address of the TWIM (i.e. &AVR32_TWIM)
* \param package Package information and data
* (see \ref twim_package_t)
* \retval STATUS_OK If all bytes were read successfully
* \retval ERR_IO_ERROR NACK received or Bus Arbitration lost
*/
status_code_t twim_read_packet (volatile avr32_twim_t *twim,
const twim_package_t *package)
{
// Disable master transfer
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
// Set pointer to TWIM instance for IT
twim_inst = twim;
// Disable the TWIM interrupts
twim_disable_interrupt (twim_inst);
// get a pointer to applicative data
twim_rx_data = package->buffer;
// get a copy of nb bytes to read
twim_rx_nb_bytes = package->length;
// Set next write transfer to false
twim_next = false;
// Initialize bus transfer status
transfer_status = TWI_SUCCESS;
//check if internal address access is performed
if (package->addr_length) {
// Reset the TWIM module to clear the THR register
twim_inst->cr = AVR32_TWIM_CR_MEN_MASK;
twim_inst->cr = AVR32_TWIM_CR_SWRST_MASK;
twim_inst->cr = AVR32_TWIM_CR_MDIS_MASK;
// selection of first valid byte of the address
twim_tx_data = package->addr;
// set the number of bytes to transmit
twim_tx_nb_bytes = package->addr_length;
// mask NACK, TXRDY and RXRDY interrupts
twim_it_mask = AVR32_TWIM_IER_STD_MASK |
AVR32_TWIM_IER_TXRDY_MASK | AVR32_TWIM_IER_RXRDY_MASK;
// Set the command register to initiate the transfer
twim_inst->cmdr = (package->chip << AVR32_TWIM_CMDR_SADR_OFFSET)
| (package->addr_length << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (0 << AVR32_TWIM_CMDR_READ_OFFSET);
// set the next command register to followup with the previous command
twim_inst->ncmdr = ((package->chip) << AVR32_TWIM_CMDR_SADR_OFFSET)
| (package->length << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| (AVR32_TWIM_CMDR_READ_MASK);
} else {
twim_tx_nb_bytes = 0;
// mask NACK and RXRDY interrupts
twim_it_mask = AVR32_TWIM_IER_STD_MASK | AVR32_TWIM_IER_RXRDY_MASK;
// Set the command register to initiate the transfer
twim_inst->cmdr = (package->chip << AVR32_TWIM_CMDR_SADR_OFFSET)
| (package->length << AVR32_TWIM_CMDR_NBYTES_OFFSET)
| (AVR32_TWIM_CMDR_VALID_MASK)
| (AVR32_TWIM_CMDR_START_MASK)
| (AVR32_TWIM_CMDR_STOP_MASK)
| (AVR32_TWIM_CMDR_READ_MASK);
}
// update IMR through IER
twim_inst->ier = twim_it_mask;
// Enable master transfer
twim->cr = AVR32_TWIM_CR_MEN_MASK;
// Enable all interrupts
cpu_irq_enable ();
// get data
while (!(transfer_status) && !(twim_status ())) {
cpu_relax();
}
// Disable master transfer
twim->cr = AVR32_TWIM_CR_MDIS_MASK;
if (transfer_status == TWI_RECEIVE_NACK
|| transfer_status == TWI_ARBITRATION_LOST) {
return ERR_IO_ERROR;
}
return STATUS_OK;
}
