/** Configure I2C as slave or master.
* @param obj The I2C object
* @param data The buffer for sending
* @param length Number of bytes to write
* @return non-zero if a value is available
*/
int i2c_slave_write(i2c_t *obj, const char *data, int length)
{
struct i2c_s *obj_s = I2C_S(obj);
int count = 0;
int timeout = 0;
i2c_ack_config(obj_s->i2c, I2C_ACK_ENABLE);
/* wait until ADDSEND bit is set */
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_ADDSEND)) {
timeout++;
if (timeout > 100000) {
return -1;
}
}
/* clear ADDSEND bit */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_ADDSEND);
while (length > 0) {
/* wait until the TBE bit is set */
timeout = 0;
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_TBE)) {
timeout++;
if (timeout > 100000) {
return -1;
}
}
i2c_data_transmit(obj_s->i2c, *data);
data++;
length--;
count++;
}
/* the master doesn't acknowledge for the last byte */
timeout = 0;
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_AERR)) {
timeout++;
if (timeout > 100000) {
return -1;
}
}
/* clear the bit of AERR */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_AERR);
/* disable acknowledge */
i2c_ack_config(obj_s->i2c, I2C_ACK_DISABLE);
return count;
}
/** Configure I2C as slave or master.
* @param obj The I2C object
* @param data The buffer for receiving
* @param length Number of bytes to read
* @return non-zero if a value is available
*/
int i2c_slave_read(i2c_t *obj, char *data, int length)
{
struct i2c_s *obj_s = I2C_S(obj);
int count = 0;
int timeout = 0;
i2c_ack_config(obj_s->i2c, I2C_ACK_ENABLE);
/* wait until ADDSEND bit is set */
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_ADDSEND)) {
timeout++;
if (timeout > 100000) {
return -1;
}
}
/* clear ADDSEND bit */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_ADDSEND);
while (0 < length) {
/* wait until the RBNE bit is set */
timeout = 0;
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_RBNE)) {
timeout++;
if (timeout > 100000) {
return -1;
}
}
*data = i2c_data_receive(obj_s->i2c);
data++;
length--;
count++;
}
/* wait until the STPDET bit is set */
timeout = 0;
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_STPDET)) {
timeout++;
if (timeout > 100) {
return count;
}
}
/* clear the STPDET bit */
i2c_enable(obj_s->i2c);
i2c_ack_config(obj_s->i2c, I2C_ACK_DISABLE);
return count;
}
/*!
\brief handle I2C1 error interrupt request
\param[in] none
\param[out] none
\retval none
*/
void I2C1_ErrorIRQ_Handler(void)
{
/* no acknowledge received */
if(i2c_flag_get(I2C1, I2C_AERR)){
i2c_flag_clear(I2C1, I2C_AERR);
}
/* SMBus alert */
if(i2c_flag_get(I2C1, I2C_SMBALTS)){
i2c_flag_clear(I2C1, I2C_SMBALTS);
}
/* bus timeout in SMBus mode */
if(i2c_flag_get(I2C1, I2C_SMBTO)){
i2c_flag_clear(I2C1, I2C_SMBTO);
}
/* over-run or under-run when SCL stretch is disabled */
if(i2c_flag_get(I2C1, I2C_OUERR)){
i2c_flag_clear(I2C1, I2C_OUERR);
}
/* arbitration lost */
if(i2c_flag_get(I2C1, I2C_LOSTARB)){
i2c_flag_clear(I2C1, I2C_LOSTARB);
}
/* bus error */
if(i2c_flag_get(I2C1, I2C_BERR)){
i2c_flag_clear(I2C1, I2C_BERR);
}
/* CRC value doesn't match */
if(i2c_flag_get(I2C1, I2C_PECERR)){
i2c_flag_clear(I2C1, I2C_PECERR);
}
/* disable the error interrupt */
i2c_interrupt_disable(I2C1,I2C_CTL1_ERRIE | I2C_CTL1_BUFIE | I2C_CTL1_EVIE);
}
/** Send START command
*
* @param obj The I2C object
*/
int i2c_start(i2c_t *obj)
{
int timeout;
struct i2c_s *obj_s = I2C_S(obj);
/* clear I2C_FLAG_AERR Flag */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_AERR);
/* wait until I2C_FLAG_I2CBSY flag is reset */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_I2CBSY)) == SET) {
if ((timeout--) == 0) {
return (int)GD_BUSY;
}
}
/* ensure the i2c has been stopped */
timeout = FLAG_TIMEOUT;
while ((I2C_CTL0(obj_s->i2c) & I2C_CTL0_STOP) == I2C_CTL0_STOP) {
if ((timeout--) == 0) {
return (int)GD_ERROR;
}
}
/* generate a START condition */
i2c_start_on_bus(obj_s->i2c);
/* ensure the i2c has been started successfully */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_SBSEND)) == RESET) {
if ((timeout--) == 0) {
return (int)GD_ERROR;
}
}
return (int)GD_OK;
}
/** Blocking sending data
*
* @param obj The I2C object
* @param address 7-bit address (last bit is 0)
* @param data The buffer for sending
* @param length Number of bytes to write
* @param stop Stop to be generated after the transfer is done
* @return
* zero or non-zero - Number of written bytes
* negative - I2C_ERROR_XXX status
*/
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
{
struct i2c_s *obj_s = I2C_S(obj);
gd_status_enum status = GD_OK;
uint32_t count = 0;
int timeout = 0;
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME ||
obj_s->global_trans_option == I2C_LAST_FRAME) {
if (stop) {
obj_s->global_trans_option = I2C_FIRST_AND_LAST_FRAME;
} else {
obj_s->global_trans_option = I2C_FIRST_FRAME;
}
} else if (obj_s->global_trans_option == I2C_FIRST_FRAME ||
obj_s->global_trans_option == I2C_NEXT_FRAME) {
if (stop) {
obj_s->global_trans_option = I2C_LAST_FRAME;
} else {
obj_s->global_trans_option = I2C_NEXT_FRAME;
}
}
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME || obj_s->global_trans_option == I2C_FIRST_FRAME) {
/* wait until I2C_FLAG_I2CBSY flag is reset */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_I2CBSY)) == SET) {
if ((timeout--) == 0) {
i2c_stop(obj);
return I2C_ERROR_BUS_BUSY;
}
}
}
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME || obj_s->global_trans_option == I2C_FIRST_FRAME ||
obj_s->previous_state_mode != I2C_STATE_MASTER_BUSY_TX) {
/* generate a START condition */
i2c_start_on_bus(obj_s->i2c);
/* ensure the i2c has been started successfully */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_SBSEND)) == RESET) {
if ((timeout--) == 0) {
i2c_stop(obj);
return I2C_ERROR_BUS_BUSY;
}
}
/* send slave address */
i2c_master_addressing(obj_s->i2c, address, I2C_TRANSMITTER);
/* wait until I2C_FLAG_ADDSEND flag is set */
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_ADDSEND)) {
timeout++;
if (timeout > 100000) {
i2c_stop(obj);
return I2C_ERROR_NO_SLAVE;
}
}
/* clear ADDSEND */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_ADDSEND);
}
obj_s->state = (operation_state_enum)I2C_STATE_MASTER_BUSY_TX;
for (count = 0; count < length; count++) {
status = (gd_status_enum)i2c_byte_write(obj, data[count]);
if (status != 1) {
i2c_stop(obj);
return count;
}
}
obj_s->previous_state_mode = obj_s->state;
/* if not sequential write, then send stop */
if (stop) {
i2c_stop(obj);
}
return count;
}
/** Blocking reading data
*
* @param obj The I2C object
* @param address 7-bit address (last bit is 1)
* @param data The buffer for receiving
* @param length Number of bytes to read
* @param stop Stop to be generated after the transfer is done
* @return Number of read bytes
*/
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
{
struct i2c_s *obj_s = I2C_S(obj);
uint32_t count = 0U;
int timeout = 0;
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME ||
obj_s->global_trans_option == I2C_LAST_FRAME) {
if (stop) {
obj_s->global_trans_option = I2C_FIRST_AND_LAST_FRAME;
} else {
obj_s->global_trans_option = I2C_FIRST_FRAME;
}
} else if (obj_s->global_trans_option == I2C_FIRST_FRAME ||
obj_s->global_trans_option == I2C_NEXT_FRAME) {
if (stop) {
obj_s->global_trans_option = I2C_LAST_FRAME;
} else {
obj_s->global_trans_option = I2C_NEXT_FRAME;
}
}
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME || obj_s->global_trans_option == I2C_FIRST_FRAME) {
/* wait until I2C_FLAG_I2CBSY flag is reset */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_I2CBSY)) == SET) {
if ((timeout--) == 0) {
i2c_stop(obj);
return I2C_ERROR_BUS_BUSY;
}
}
}
if (obj_s->global_trans_option == I2C_FIRST_AND_LAST_FRAME || obj_s->global_trans_option == I2C_FIRST_FRAME ||
obj_s->previous_state_mode != I2C_STATE_MASTER_BUSY_RX) {
/* generate a START condition */
i2c_start_on_bus(obj_s->i2c);
/* ensure the i2c has been started successfully */
timeout = FLAG_TIMEOUT;
while ((i2c_flag_get(obj_s->i2c, I2C_FLAG_SBSEND)) == RESET) {
if ((timeout--) == 0) {
i2c_stop(obj);
return I2C_ERROR_BUS_BUSY;
}
}
/* send slave address */
i2c_master_addressing(obj_s->i2c, address, I2C_RECEIVER);
if (1 == length) {
/* disable acknowledge */
i2c_ack_config(obj_s->i2c, I2C_ACK_DISABLE);
/* send a stop condition to I2C bus*/
} else if (2 == length) {
/* send a NACK for the next data byte which will be received into the shift register */
i2c_ackpos_config(obj_s->i2c, I2C_ACKPOS_NEXT);
/* 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 I2C_FLAG_ADDSEND flag is set */
while (!i2c_flag_get(obj_s->i2c, I2C_FLAG_ADDSEND)) {
timeout++;
if (timeout > 100000) {
i2c_stop(obj);
return I2C_ERROR_NO_SLAVE;
}
}
/* clear ADDSEND */
i2c_flag_clear(obj_s->i2c, I2C_FLAG_ADDSEND);
}
obj_s->state = (operation_state_enum)I2C_STATE_MASTER_BUSY_RX;
for (count = 0; count < length; count++) {
if (length > 2 && count == length - 3) {
while (RESET == i2c_flag_get(obj_s->i2c, I2C_FLAG_BTC));
i2c_ack_config(obj_s->i2c, I2C_ACK_DISABLE);
} else if (2 == length && count == 0) {
while (RESET == i2c_flag_get(obj_s->i2c, I2C_FLAG_BTC));
}
while (RESET == i2c_flag_get(obj_s->i2c, I2C_FLAG_RBNE));
data[count] = i2c_data_receive(obj_s->i2c);
}
obj_s->previous_state_mode = obj_s->state;
/* if not sequential read, then send stop */
if (stop) {
i2c_stop(obj);
}
return count;
}