/**
* @brief Process an i2c transaction.
*
* Transactions are composed of one or more i2c_msg's, and may be read
* or write tranfers. Multiple i2c_msg's will generate a repeated
* start in between messages.
*
* @param dev I2C device
* @param msgs Messages to send/receive
* @param num Number of messages to send/receive
* @param timeout Bus idle timeout in milliseconds before aborting the
* transfer. 0 denotes no timeout.
* @return 0 on success,
* I2C_ERROR_PROTOCOL if there was a protocol error,
* I2C_ERROR_TIMEOUT if the transfer timed out.
*/
int32 i2c_master_xfer(i2c_dev *dev,
i2c_msg *msgs,
uint16 num,
uint32 timeout) {
int32 rc;
ASSERT(dev->state == I2C_STATE_IDLE);
dev->msg = msgs;
dev->msgs_left = num;
dev->timestamp = systick_uptime();
dev->state = I2C_STATE_BUSY;
i2c_enable_irq(dev, I2C_IRQ_EVENT);
i2c_start_condition(dev);
rc = wait_for_state_change(dev, I2C_STATE_XFER_DONE, timeout);
if (rc < 0) {
goto out;
}
dev->state = I2C_STATE_IDLE;
out:
return rc;
}
int i2c_master_recv_data(unsigned int addr,
unsigned char *data, unsigned int len)
{
unsigned int i = 0;
int ret = 0;
ret = i2c_set_master(); // get iic bus, as bus master;
if (ret) {
putstring("\nget i2c bus error\n");
return ret; // error while getting bus
}
i2c_enable_irq();
i2c_message_start(addr, 1);
while (1) {
i++;
if (i == len) { // last byte
i2c_disable_ack();
break;
}
*data++ = IICDS;
IICCON &= ~(1 << 4); // resume trasmit
// TODO dealy ??
for (ret = 0; ret < 30; ret++) ; // setup time
}
/* last byte */
*data++ = IICDS;
IICCON &= ~(1 << 4); // resume trasmit
// TODO dealy ??
for (ret = 0; ret < 30; ret++) ; // setup time
return len;
}
/**
* @brief Initialize an I2C device as bus master
* @param dev Device to enable
* @param flags Bitwise or of the following I2C options:
* I2C_FAST_MODE: 400 khz operation,
* I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for
* fast mode),
* I2C_BUS_RESET: Reset the bus and clock out any hung slaves on
* initialization,
* I2C_10BIT_ADDRESSING: Enable 10-bit addressing,
* I2C_REMAP: (deprecated, STM32F1 only) Remap I2C1 to SCL/PB8
* SDA/PB9.
*/
void i2c_master_enable(i2c_dev *dev, uint32 flags) {
/* Reset the bus. Clock out any hung slaves. */
if (flags & I2C_BUS_RESET) {
fooprint("i2c_master_enable: calling i2c_bus_reset");
i2c_bus_reset(dev);
}
fooprint("i2c_master_enable: entry");
/* PE must be disabled to configure the device */
// ASSERT(!(dev->regs->CR1 & I2C_CR1_PE));
/* Ugh */
//_i2c_handle_remap(dev, flags);
fooprint("i2c_master_enable: calling i2c_init");
/* Turn on clock and set GPIO modes */
i2c_init(dev);
fooprint("i2c_master_enable: calling i2c_config_gpios");
i2c_config_gpios(dev);
fooprint("i2c_master_enable: calling set_freq_scl");
/* Configure clock and rise time */
set_freq_scl(dev, flags);
fooprint("i2c_master_enable: calling nvic_irq_enable(ev)");
/* Enable event and buffer interrupts */
nvic_irq_enable(dev->ev_nvic_line);
fooprint("i2c_master_enable: calling nvic_irq_enable(er)");
nvic_irq_enable(dev->er_nvic_line);
//gutted
fooprint("i2c_master_enable: calling i2c_enable_irq");
i2c_enable_irq(dev, I2C_CFGR_STOIEN_MASK | I2C_CFGR_ACKIEN_MASK | I2C_CFGR_RXIEN_MASK | I2C_CFGR_TXIEN_MASK | I2C_CFGR_STAIEN_MASK | I2C_CFGR_ARBLIEN_MASK);
/* Make it go! */
fooprint("i2c_master_enable: calling i2c_peripheral_enable");
//gutted
i2c_peripheral_enable(dev);
dev->state = I2C_STATE_IDLE;
fooprint("i2c_master_enable: exit, dev-state = I2C_STATE_IDLE");
}
/**
* @brief Initialize an I2C device as bus master
* @param dev Device to enable
* @param flags Bitwise or of the following I2C options:
* I2C_FAST_MODE: 400 khz operation,
* I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for
* fast mode),
* I2C_BUS_RESET: Reset the bus and clock out any hung slaves on
* initialization,
* I2C_10BIT_ADDRESSING: Enable 10-bit addressing,
* I2C_REMAP: (deprecated, STM32F1 only) Remap I2C1 to SCL/PB8
* SDA/PB9.
*/
void i2c_master_enable(i2c_dev *dev, uint32 flags) {
/* PE must be disabled to configure the device */
ASSERT(!(dev->regs->CR1 & I2C_CR1_PE));
/* Ugh */
_i2c_handle_remap(dev, flags);
/* Reset the bus. Clock out any hung slaves. */
if (flags & I2C_BUS_RESET) {
i2c_bus_reset(dev);
}
/* Turn on clock and set GPIO modes */
i2c_init(dev);
i2c_config_gpios(dev);
/* Configure clock and rise time */
set_ccr_trise(dev, flags);
/* Enable event and buffer interrupts */
nvic_irq_enable(dev->ev_nvic_line);
nvic_irq_enable(dev->er_nvic_line);
i2c_enable_irq(dev, I2C_IRQ_EVENT | I2C_IRQ_BUFFER | I2C_IRQ_ERROR);
/* Configure the slave unit */
if (flags & I2C_SLAVE_DUAL_ADDRESS) {
i2c_slave_dual_address_enable(dev);
}
if (flags & I2C_SLAVE_GENERAL_CALL) {
i2c_slave_general_call_enable(dev);
}
/* store all of the flags */
dev->config_flags = flags;
/* Make it go! */
i2c_peripheral_enable(dev);
i2c_enable_ack(dev);
dev->state = I2C_STATE_IDLE;
}
/*
* IRQ handler for I2C master. Handles transmission/reception.
*/
void _i2c_irq_handler(i2c_dev *dev) {
/* WTFs:
* - Where is I2C_MSG_10BIT_ADDR handled?
*/
i2c_msg *msg = dev->msg;
uint8 read = msg->flags & I2C_MSG_READ;
uint32 sr1 = dev->regs->SR1;
uint32 sr2 = dev->regs->SR2;
I2C_CRUMB(IRQ_ENTRY, sr1, sr2);
/*
* Reset timeout counter
*/
dev->timestamp = systick_uptime();
/*
* Add Slave support
*/
/* Check to see if MSL master slave bit is set */
if ((sr2 & I2C_SR2_MSL) != I2C_SR2_MSL) { /* 0 = slave mode 1 = master */
/* Check for address match */
if (sr1 & I2C_SR1_ADDR) {
/* Find out which address was matched */
/* Check the general call address first */
if (sr2 & I2C_SR2_GENCALL) {
dev->i2c_slave_msg->addr = 0;
}
/* We matched the secondary address */
else if (sr2 & I2C_SR2_DUALF) {
dev->i2c_slave_msg->addr = dev->regs->OAR2 & 0xFE;
}
/* We matched the primary address */
else if ((sr2 & I2C_SR2_DUALF) != I2C_SR2_DUALF) {
dev->i2c_slave_msg->addr = dev->regs->OAR1 & 0xFE;
}
/* Shouldn't get here */
else {
dev->i2c_slave_msg->addr = -1; /* uh oh */
}
/* if we have buffered io */
if ((dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) ||
(dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
/* if receiving then this would be a repeated start
*
*if we have some bytes already
*/
if ((dev->state == I2C_STATE_SL_RX) &&
(dev->i2c_slave_msg->xferred > 0) &&
(dev->config_flags & I2C_SLAVE_USE_RX_BUFFER)) {
/* Call the callback with the contents of the data */
if (dev->i2c_slave_recv_callback != NULL) {
(*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
}
}
/* Reset the message back to defaults.
* We are starting a new message
*/
dev->i2c_slave_msg->flags = 0;
dev->i2c_slave_msg->length = 0;
dev->i2c_slave_msg->xferred = 0;
dev->msgs_left = 0;
dev->timestamp = systick_uptime();
/* We have been addressed with SLA+R so
* the master wants us to transmit
*/
if ((sr1 & I2C_SR1_TXE) &&
(dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
/* Call the transmit callback so it can populate the msg
* data with the bytes to go
*/
if (dev->i2c_slave_transmit_callback != NULL) {
(*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg);
}
}
dev->state = I2C_STATE_BUSY;
}
sr1 = sr2 = 0;
}
/* EV3: Master requesting data from slave. Transmit a byte*/
if (sr1 & I2C_SR1_TXE) {
if (dev->config_flags & I2C_SLAVE_USE_TX_BUFFER) {
if (dev->i2c_slave_msg->xferred >= dev->i2c_slave_msg->length) {
/* End of the transmit buffer? If so we NACK */
i2c_disable_ack(dev);
/* We have to either issue a STOP or write something here.
* STOP here seems to screw up some masters,
* For now padding with 0
*/
i2c_write(dev, 0);
/*i2c_stop_condition(dev); // This is causing bus lockups way more than it should !? Seems some I2C master devices freak out here*/
}
else
{
/* NACk the last byte */
if (dev->i2c_slave_msg->xferred == dev->i2c_slave_msg->length-1) {
i2c_disable_ack(dev);
}
else {
i2c_enable_ack(dev);
}
i2c_write(dev, dev->i2c_slave_msg->data[dev->i2c_slave_msg->xferred++]);
}
}
else
{
/* Call the callback to get the data we need.
* The callback is expected to write using i2c_write(...)
* If the slave is going to terminate the transfer, this function should
* also do a NACK on the last byte!
*/
if (dev->i2c_slave_transmit_callback != NULL) (*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg);
}
dev->state = I2C_STATE_BUSY;
sr1 = sr2 = 0;
}
/* EV2: Slave received data from a master. Get from DR */
if (sr1 & I2C_SR1_RXNE) {
if (dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) {
/* Fill the buffer with the contents of the data register */
/* These is potential for buffer overflow here, so we should
* really store the size of the array. This is expensive in
* the ISR so left out for now. We must trust the implementor!
*/
dev->i2c_slave_msg->data[dev->i2c_slave_msg->xferred++] = dev->regs->DR;
dev->i2c_slave_msg->length++;
}
else {
/* Call the callback with the contents of the data */
dev->i2c_slave_msg->data[0] = dev->regs->DR;
if (dev->i2c_slave_recv_callback != NULL) (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
}
dev->state = I2C_STATE_SL_RX;
sr1 = sr2 = 0;
}
/* EV4: Slave has detected a STOP condition on the bus */
if (sr1 & I2C_SR1_STOPF) {
dev->regs->CR1 |= I2C_CR1_PE;
if ((dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) ||
(dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
/* The callback with the data will happen on a NACK of the last data byte.
* This is handled in the error IRQ (AF bit)
*/
/* Handle the case where the master misbehaves by sending no NACK */
if (dev->state != I2C_STATE_IDLE) {
if (dev->state == I2C_STATE_SL_RX) {
if (dev->i2c_slave_recv_callback != NULL) (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
}
else {
if (dev->i2c_slave_transmit_callback != NULL) (*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg);
}
}
}
sr1 = sr2 = 0;
dev->state = I2C_STATE_IDLE;
}
return;
}
/*
* EV5: Start condition sent
*/
if (sr1 & I2C_SR1_SB) {
msg->xferred = 0;
i2c_enable_irq(dev, I2C_IRQ_BUFFER);
/*
* Master receiver
*/
if (read) {
i2c_enable_ack(dev);
}
i2c_send_slave_addr(dev, msg->addr, read);
sr1 = sr2 = 0;
}
/*
* EV6: Slave address sent
*/
if (sr1 & I2C_SR1_ADDR) {
/*
* Special case event EV6_1 for master receiver.
* Generate NACK and restart/stop condition after ADDR
* is cleared.
*/
if (read) {
if (msg->length == 1) {
i2c_disable_ack(dev);
if (dev->msgs_left > 1) {
i2c_start_condition(dev);
I2C_CRUMB(RX_ADDR_START, 0, 0);
} else {
i2c_stop_condition(dev);
I2C_CRUMB(RX_ADDR_STOP, 0, 0);
}
}
} else {
/*
* Master transmitter: write first byte to fill shift
* register. We should get another TXE interrupt
* immediately to fill DR again.
*/
if (msg->length != 1) {
i2c_write(dev, msg->data[msg->xferred++]);
}
}
sr1 = sr2 = 0;
}
/*
* EV8: Master transmitter
* Transmit buffer empty, but we haven't finished transmitting the last
* byte written.
*/
if ((sr1 & I2C_SR1_TXE) && !(sr1 & I2C_SR1_BTF)) {
I2C_CRUMB(TXE_ONLY, 0, 0);
if (dev->msgs_left) {
i2c_write(dev, msg->data[msg->xferred++]);
if (msg->xferred == msg->length) {
/*
* End of this message. Turn off TXE/RXNE and wait for
* BTF to send repeated start or stop condition.
*/
i2c_disable_irq(dev, I2C_IRQ_BUFFER);
dev->msgs_left--;
}
} else {
/*
* This should be impossible...
*/
ASSERT(0);
}
sr1 = sr2 = 0;
}
/*
* EV8_2: Master transmitter
* Last byte sent, program repeated start/stop
*/
if ((sr1 & I2C_SR1_TXE) && (sr1 & I2C_SR1_BTF)) {
I2C_CRUMB(TXE_BTF, 0, 0);
if (dev->msgs_left) {
I2C_CRUMB(TEST, 0, 0);
/*
* Repeated start insanity: We can't disable ITEVTEN or else SB
* won't interrupt, but if we don't disable ITEVTEN, BTF will
* continually interrupt us. What the f**k ST?
*/
i2c_start_condition(dev);
while (!(dev->regs->SR1 & I2C_SR1_SB))
;
dev->msg++;
} else {
i2c_stop_condition(dev);
/*
* Turn off event interrupts to keep BTF from firing until
* the end of the stop condition. Why on earth they didn't
* have a start/stop condition request clear BTF is beyond
* me.
*/
i2c_disable_irq(dev, I2C_IRQ_EVENT);
I2C_CRUMB(STOP_SENT, 0, 0);
dev->state = I2C_STATE_XFER_DONE;
}
sr1 = sr2 = 0;
}
/*
* EV7: Master Receiver
*/
if (sr1 & I2C_SR1_RXNE) {
I2C_CRUMB(RXNE_ONLY, 0, 0);
msg->data[msg->xferred++] = dev->regs->DR;
/*
* EV7_1: Second to last byte in the reception? Set NACK and generate
* stop/restart condition in time for the last byte. We'll get one more
* RXNE interrupt before shutting things down.
*/
if (msg->xferred == (msg->length - 1)) {
i2c_disable_ack(dev);
if (dev->msgs_left > 2) {
i2c_start_condition(dev);
I2C_CRUMB(RXNE_START_SENT, 0, 0);
} else {
i2c_stop_condition(dev);
I2C_CRUMB(RXNE_STOP_SENT, 0, 0);
}
} else if (msg->xferred == msg->length) {
dev->msgs_left--;
if (dev->msgs_left == 0) {
/*
* We're done.
*/
I2C_CRUMB(RXNE_DONE, 0, 0);
dev->state = I2C_STATE_XFER_DONE;
} else {
dev->msg++;
}
}
}
}
/**
* @brief Initialize an I2C device as bus master
* @param dev Device to enable
* @param flags Bitwise or of the following I2C options:
* I2C_FAST_MODE: 400 khz operation,
* I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for
* fast mode),
* I2C_BUS_RESET: Reset the bus and clock out any hung slaves on
* initialization,
* I2C_10BIT_ADDRESSING: Enable 10-bit addressing,
* I2C_REMAP: Remap I2C1 to SCL/PB8 SDA/PB9.
*/
void i2c_master_enable(i2c_dev *dev, uint32 flags) {
#define I2C_CLK (STM32_PCLK1/1000000)
uint32 ccr = 0;
uint32 trise = 0;
/* PE must be disabled to configure the device */
ASSERT(!(dev->regs->CR1 & I2C_CR1_PE));
if ((dev == I2C1) && (flags & I2C_REMAP)) {
afio_remap(AFIO_REMAP_I2C1);
I2C1->sda_pin = 9;
I2C1->scl_pin = 8;
}
/* Reset the bus. Clock out any hung slaves. */
if (flags & I2C_BUS_RESET) {
i2c_bus_reset(dev);
}
/* Turn on clock and set GPIO modes */
i2c_init(dev);
gpio_set_mode(dev->gpio_port, dev->sda_pin, GPIO_AF_OUTPUT_OD);
gpio_set_mode(dev->gpio_port, dev->scl_pin, GPIO_AF_OUTPUT_OD);
/* I2C1 and I2C2 are fed from APB1, clocked at 36MHz */
i2c_set_input_clk(dev, I2C_CLK);
if (flags & I2C_FAST_MODE) {
ccr |= I2C_CCR_FS;
if (flags & I2C_DUTY_16_9) {
/* Tlow/Thigh = 16/9 */
ccr |= I2C_CCR_DUTY;
ccr |= STM32_PCLK1/(400000 * 25);
} else {
/* Tlow/Thigh = 2 */
ccr |= STM32_PCLK1/(400000 * 3);
}
trise = (300 * (I2C_CLK)/1000) + 1;
} else {
/* Tlow/Thigh = 1 */
ccr = STM32_PCLK1/(100000 * 2);
trise = I2C_CLK + 1;
}
/* Set minimum required value if CCR < 1*/
if ((ccr & I2C_CCR_CCR) == 0) {
ccr |= 0x1;
}
i2c_set_clk_control(dev, ccr);
i2c_set_trise(dev, trise);
/* Enable event and buffer interrupts */
nvic_irq_enable(dev->ev_nvic_line);
nvic_irq_enable(dev->er_nvic_line);
i2c_enable_irq(dev, I2C_IRQ_EVENT | I2C_IRQ_BUFFER | I2C_IRQ_ERROR);
/*
* Important STM32 Errata:
*
* See STM32F10xx8 and STM32F10xxB Errata sheet (Doc ID 14574 Rev 8),
* Section 2.11.1, 2.11.2.
*
* 2.11.1:
* When the EV7, EV7_1, EV6_1, EV6_3, EV2, EV8, and EV3 events are not
* managed before the current byte is being transferred, problems may be
* encountered such as receiving an extra byte, reading the same data twice
* or missing data.
*
* 2.11.2:
* In Master Receiver mode, when closing the communication using
* method 2, the content of the last read data can be corrupted.
*
* If the user software is not able to read the data N-1 before the STOP
* condition is generated on the bus, the content of the shift register
* (data N) will be corrupted. (data N is shifted 1-bit to the left).
*
* ----------------------------------------------------------------------
*
* In order to ensure that events are not missed, the i2c interrupt must
* not be preempted. We set the i2c interrupt priority to be the highest
* interrupt in the system (priority level 0). All other interrupts have
* been initialized to priority level 16. See nvic_init().
*/
nvic_irq_set_priority(dev->ev_nvic_line, 0);
nvic_irq_set_priority(dev->er_nvic_line, 0);
/* Make it go! */
i2c_peripheral_enable(dev);
dev->state = I2C_STATE_IDLE;
}
/**
* @brief IRQ handler for I2C master. Handles transmission/reception.
* @param dev I2C device
*/
static void i2c_irq_handler(i2c_dev *dev) {
i2c_msg *msg = dev->msg;
uint8 read = msg->flags & I2C_MSG_READ;
uint32 sr1 = dev->regs->SR1;
uint32 sr2 = dev->regs->SR2;
I2C_CRUMB(IRQ_ENTRY, sr1, sr2);
/*
* Reset timeout counter
*/
dev->timestamp = systick_uptime();
/*
* EV5: Start condition sent
*/
if (sr1 & I2C_SR1_SB) {
msg->xferred = 0;
i2c_enable_irq(dev, I2C_IRQ_BUFFER);
/*
* Master receiver
*/
if (read) {
i2c_enable_ack(dev);
}
i2c_send_slave_addr(dev, msg->addr, read);
sr1 = sr2 = 0;
}
/*
* EV6: Slave address sent
*/
if (sr1 & I2C_SR1_ADDR) {
/*
* Special case event EV6_1 for master receiver.
* Generate NACK and restart/stop condition after ADDR
* is cleared.
*/
if (read) {
if (msg->length == 1) {
i2c_disable_ack(dev);
if (dev->msgs_left > 1) {
i2c_start_condition(dev);
I2C_CRUMB(RX_ADDR_START, 0, 0);
} else {
i2c_stop_condition(dev);
I2C_CRUMB(RX_ADDR_STOP, 0, 0);
}
}
} else {
/*
* Master transmitter: write first byte to fill shift
* register. We should get another TXE interrupt
* immediately to fill DR again.
*/
if (msg->length != 1) {
i2c_write(dev, msg->data[msg->xferred++]);
}
}
sr1 = sr2 = 0;
}
/*
* EV8: Master transmitter
* Transmit buffer empty, but we haven't finished transmitting the last
* byte written.
*/
if ((sr1 & I2C_SR1_TXE) && !(sr1 & I2C_SR1_BTF)) {
I2C_CRUMB(TXE_ONLY, 0, 0);
if (dev->msgs_left) {
i2c_write(dev, msg->data[msg->xferred++]);
if (msg->xferred == msg->length) {
/*
* End of this message. Turn off TXE/RXNE and wait for
* BTF to send repeated start or stop condition.
*/
i2c_disable_irq(dev, I2C_IRQ_BUFFER);
dev->msgs_left--;
}
} else {
/*
* This should be impossible...
*/
throb();
}
sr1 = sr2 = 0;
}
/*
* EV8_2: Master transmitter
* Last byte sent, program repeated start/stop
*/
if ((sr1 & I2C_SR1_TXE) && (sr1 & I2C_SR1_BTF)) {
I2C_CRUMB(TXE_BTF, 0, 0);
if (dev->msgs_left) {
I2C_CRUMB(TEST, 0, 0);
/*
* Repeated start insanity: We can't disable ITEVTEN or else SB
* won't interrupt, but if we don't disable ITEVTEN, BTF will
* continually interrupt us. What the f**k ST?
*/
i2c_start_condition(dev);
while (!(dev->regs->SR1 & I2C_SR1_SB))
;
dev->msg++;
} else {
i2c_stop_condition(dev);
/*
* Turn off event interrupts to keep BTF from firing until
* the end of the stop condition. Why on earth they didn't
* have a start/stop condition request clear BTF is beyond
* me.
*/
i2c_disable_irq(dev, I2C_IRQ_EVENT);
I2C_CRUMB(STOP_SENT, 0, 0);
dev->state = I2C_STATE_XFER_DONE;
}
sr1 = sr2 = 0;
}
/*
* EV7: Master Receiver
*/
if (sr1 & I2C_SR1_RXNE) {
I2C_CRUMB(RXNE_ONLY, 0, 0);
msg->data[msg->xferred++] = dev->regs->DR;
/*
* EV7_1: Second to last byte in the reception? Set NACK and generate
* stop/restart condition in time for the last byte. We'll get one more
* RXNE interrupt before shutting things down.
*/
if (msg->xferred == (msg->length - 1)) {
i2c_disable_ack(dev);
if (dev->msgs_left > 2) {
i2c_start_condition(dev);
I2C_CRUMB(RXNE_START_SENT, 0, 0);
} else {
i2c_stop_condition(dev);
I2C_CRUMB(RXNE_STOP_SENT, 0, 0);
}
} else if (msg->xferred == msg->length) {
dev->msgs_left--;
if (dev->msgs_left == 0) {
/*
* We're done.
*/
I2C_CRUMB(RXNE_DONE, 0, 0);
dev->state = I2C_STATE_XFER_DONE;
} else {
dev->msg++;
}
}
}
}