/**
* @brief Close the I2C device
*
* @param id I2C device to close.
*/
void
i2c_close(const i2c_device id)
{
if (I2C_DATA(id) ->fd >= 0) {
close(I2C_DATA(id) ->fd);
}
free(id);
}
/*!
\brief master sends slave address
\param[in] i2c_periph: I2Cx(x=0,1,2)
\param[in] addr: slave address
\param[in] trandirection: transmitter or receiver
only one parameter can be selected which is shown as below:
\arg I2C_TRANSMITTER: transmitter
\arg I2C_RECEIVER: receiver
\param[out] none
\retval none
*/
void i2c_master_addressing(uint32_t i2c_periph, uint32_t addr, uint32_t trandirection)
{
/* master is a transmitter or a receiver */
if (I2C_TRANSMITTER == trandirection) {
addr = addr & I2C_TRANSMITTER;
} else {
addr = addr | I2C_RECEIVER;
}
/* send slave address */
I2C_DATA(i2c_periph) = addr;
}
/**
* @brief Write a frame to I2C device containing \a pbtTx content
*
* @param id I2C device.
* @param pbtTx pointer on buffer containing data
* @param szTx length of the buffer
* @return NFC_SUCCESS on success, otherwise driver error code
*/
int
i2c_write(i2c_device id, const uint8_t *pbtTx, const size_t szTx)
{
LOG_HEX(LOG_GROUP, "TX", pbtTx, szTx);
ssize_t writeCount;
writeCount = write(I2C_DATA(id) ->fd, pbtTx, szTx);
if ((const ssize_t) szTx == writeCount) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG,
"wrote %d bytes successfully.", (int)szTx);
return NFC_SUCCESS;
} else {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR,
"Error: wrote only %d bytes (%d expected) (%s).", (int)writeCount, (int) szTx, strerror(errno));
return NFC_EIO;
}
}
/** Write one byte
*
* @param obj The I2C object
* @param data Byte to be written
* @return 0 if NAK was received, 1 if ACK was received, 2 for timeout.
*/
int i2c_byte_write(i2c_t *obj, int data)
{
int timeout;
struct i2c_s *obj_s = I2C_S(obj);
I2C_DATA(obj_s->i2c) = (uint8_t)data;
/* wait until the byte is transmitted */
timeout = FLAG_TIMEOUT;
while (((i2c_flag_get(obj_s->i2c, I2C_FLAG_TBE)) == RESET) &&
((i2c_flag_get(obj_s->i2c, I2C_FLAG_BTC)) == RESET)) {
if ((timeout--) == 0) {
return 2;
}
}
return 1;
}
/**
* @brief Read a frame from the I2C device and copy data to \a pbtRx
*
* @param id I2C device.
* @param pbtRx pointer on buffer used to store data
* @param szRx length of the buffer
* @return length (in bytes) of read data, or driver error code (negative value)
*/
ssize_t
i2c_read(i2c_device id, uint8_t *pbtRx, const size_t szRx)
{
ssize_t res;
ssize_t recCount;
recCount = read(I2C_DATA(id) ->fd, pbtRx, szRx);
if (recCount < 0) {
res = NFC_EIO;
} else {
if (recCount < (ssize_t)szRx) {
res = NFC_EINVARG;
} else {
res = recCount;
}
}
return res;
}
/**
* @brief Read a frame from the I2C device and copy data to \a pbtRx
*
* @param id I2C device.
* @param pbtRx pointer on buffer used to store data
* @param szRx length of the buffer
* @return length (in bytes) of read data, or driver error code (negative value)
*/
ssize_t
i2c_read(i2c_device id, uint8_t *pbtRx, const size_t szRx)
{
ssize_t res;
ssize_t recCount;
recCount = read(I2C_DATA(id) ->fd, pbtRx, szRx);
if (recCount < 0) {
res = NFC_EIO;
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR,
"Error: read only %d bytes (%d expected) (%s).", (int)recCount, (int) szRx, strerror(errno));
} else {
if (recCount < (ssize_t)szRx) {
res = NFC_EINVARG;
} else {
res = recCount;
}
}
return res;
}
/** Read one byte
*
* @param obj The I2C object
* @param last Acknoledge
* @return The read byte
*/
int i2c_byte_read(i2c_t *obj, int last)
{
int timeout;
struct i2c_s *obj_s = I2C_S(obj);
if (last) {
/* disable acknowledge */
i2c_ack_config(obj_s->i2c, I2C_ACK_DISABLE);
} else {
/* enable acknowledge */
i2c_ack_config(obj_s->i2c, I2C_ACK_ENABLE);
}
/* wait until the byte is received */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_RBNE)) == RESET) {
if ((timeout--) == 0) {
return -1;
}
}
return (int)I2C_DATA(obj_s->i2c);
}
/*!
\brief I2C receive data function
\param[in] i2c_periph: I2Cx(x=0,1,2)
\param[out] none
\retval data of received
*/
uint8_t i2c_data_receive(uint32_t i2c_periph)
{
return (uint8_t)DATA_RECV(I2C_DATA(i2c_periph));
}
/*!
\brief I2C transmit data function
\param[in] i2c_periph: I2Cx(x=0,1,2)
\param[in] data: data of transmission
\param[out] none
\retval none
*/
void i2c_data_transmit(uint32_t i2c_periph, uint8_t data)
{
I2C_DATA(i2c_periph) = DATA_TRANS(data);
}
