void i2c_lpc_transfer(i2c_bus_t* const bus,
const uint_fast8_t slave_address,
const uint8_t* const data_tx, const size_t count_tx,
uint8_t* const data_rx, const size_t count_rx
) {
const uint32_t port = (uint32_t)bus->obj;
size_t i;
bool ack = false;
if (data_tx && (count_tx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_WRITE);
for(i=0; i<count_tx; i++) {
i2c_tx_byte(port, data_tx[i]);
}
}
if (data_rx && (count_rx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_READ);
for(i=0; i<count_rx; i++) {
/* ACK each byte except the last */
ack = (i!=count_rx-1);
data_rx[i] = i2c_rx_byte(port, ack);
}
}
i2c_stop(port);
}
void i2c_lpc_transfer(const uint32_t port,
const uint_fast8_t slave_address,
const uint8_t* const data_tx, const size_t count_tx,
uint8_t* const data_rx, const size_t count_rx
) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_WRITE);
for(size_t i=0; i<count_tx; i++) {
i2c_tx_byte(port, data_tx[i]);
}
if( data_rx ) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_READ);
for(size_t i=0; i<count_rx; i++) {
data_rx[i] = i2c_rx_byte(port);
}
}
i2c_stop(port);
}
