I2C
[STM32F4xx_StdPeriph_Driver]

I2C driver modules. More...

Data Structures

struct  I2C_InitTypeDef
 I2C Init structure definition. More...

Modules

 I2C_Exported_Constants
 I2C_Private_Functions

Defines

#define CR1_CLEAR_MASK   ((uint16_t)0xFBF5)
#define FLAG_MASK   ((uint32_t)0x00FFFFFF)
#define ITEN_MASK   ((uint32_t)0x07000000)

Functions

void I2C_DeInit (I2C_TypeDef *I2Cx)
 Deinitialize the I2Cx peripheral registers to their default reset values.
void I2C_Init (I2C_TypeDef *I2Cx, I2C_InitTypeDef *I2C_InitStruct)
 Initializes the I2Cx peripheral according to the specified parameters in the I2C_InitStruct.
void I2C_StructInit (I2C_InitTypeDef *I2C_InitStruct)
 Fills each I2C_InitStruct member with its default value.
void I2C_Cmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C peripheral.
void I2C_GenerateSTART (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Generates I2Cx communication START condition.
void I2C_GenerateSTOP (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Generates I2Cx communication STOP condition.
void I2C_Send7bitAddress (I2C_TypeDef *I2Cx, uint8_t Address, uint8_t I2C_Direction)
 Transmits the address byte to select the slave device.
void I2C_AcknowledgeConfig (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C acknowledge feature.
void I2C_OwnAddress2Config (I2C_TypeDef *I2Cx, uint8_t Address)
 Configures the specified I2C own address2.
void I2C_DualAddressCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C dual addressing mode.
void I2C_GeneralCallCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C general call feature.
void I2C_SoftwareResetCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C software reset.
void I2C_StretchClockCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C Clock stretching.
void I2C_FastModeDutyCycleConfig (I2C_TypeDef *I2Cx, uint16_t I2C_DutyCycle)
 Selects the specified I2C fast mode duty cycle.
void I2C_NACKPositionConfig (I2C_TypeDef *I2Cx, uint16_t I2C_NACKPosition)
 Selects the specified I2C NACK position in master receiver mode.
void I2C_SMBusAlertConfig (I2C_TypeDef *I2Cx, uint16_t I2C_SMBusAlert)
 Drives the SMBusAlert pin high or low for the specified I2C.
void I2C_ARPCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C ARP.
void I2C_SendData (I2C_TypeDef *I2Cx, uint8_t Data)
 Sends a data byte through the I2Cx peripheral.
uint8_t I2C_ReceiveData (I2C_TypeDef *I2Cx)
 Returns the most recent received data by the I2Cx peripheral.
void I2C_TransmitPEC (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C PEC transfer.
void I2C_PECPositionConfig (I2C_TypeDef *I2Cx, uint16_t I2C_PECPosition)
 Selects the specified I2C PEC position.
void I2C_CalculatePEC (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the PEC value calculation of the transferred bytes.
uint8_t I2C_GetPEC (I2C_TypeDef *I2Cx)
 Returns the PEC value for the specified I2C.
void I2C_DMACmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Enables or disables the specified I2C DMA requests.
void I2C_DMALastTransferCmd (I2C_TypeDef *I2Cx, FunctionalState NewState)
 Specifies that the next DMA transfer is the last one.
uint16_t I2C_ReadRegister (I2C_TypeDef *I2Cx, uint8_t I2C_Register)
 Reads the specified I2C register and returns its value.
void I2C_ITConfig (I2C_TypeDef *I2Cx, uint16_t I2C_IT, FunctionalState NewState)
 Enables or disables the specified I2C interrupts.
ErrorStatus I2C_CheckEvent (I2C_TypeDef *I2Cx, uint32_t I2C_EVENT)
 Checks whether the last I2Cx Event is equal to the one passed as parameter.
uint32_t I2C_GetLastEvent (I2C_TypeDef *I2Cx)
 Returns the last I2Cx Event.
FlagStatus I2C_GetFlagStatus (I2C_TypeDef *I2Cx, uint32_t I2C_FLAG)
 Checks whether the specified I2C flag is set or not.
void I2C_ClearFlag (I2C_TypeDef *I2Cx, uint32_t I2C_FLAG)
 Clears the I2Cx's pending flags.
ITStatus I2C_GetITStatus (I2C_TypeDef *I2Cx, uint32_t I2C_IT)
 Checks whether the specified I2C interrupt has occurred or not.
void I2C_ClearITPendingBit (I2C_TypeDef *I2Cx, uint32_t I2C_IT)
 Clears the I2Cx's interrupt pending bits.

Detailed Description

I2C driver modules.

Function Documentation

void I2C_AcknowledgeConfig ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C acknowledge feature.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C Acknowledgement. This parameter can be: ENABLE or DISABLE.
Return values:
None. 
void I2C_ARPCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C ARP.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2Cx ARP. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_CalculatePEC ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the PEC value calculation of the transferred bytes.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2Cx PEC value calculation. This parameter can be: ENABLE or DISABLE.
Return values:
None 
ErrorStatus I2C_CheckEvent ( I2C_TypeDef *  I2Cx,
uint32_t  I2C_EVENT 
)

Checks whether the last I2Cx Event is equal to the one passed as parameter.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_EVENT,: specifies the event to be checked. This parameter can be one of the following values:

  • I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED: EV1
  • I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED: EV1
  • I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED: EV1
  • I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED: EV1
  • I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED: EV1
  • I2C_EVENT_SLAVE_BYTE_RECEIVED: EV2
  • (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF): EV2
  • (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL): EV2
  • I2C_EVENT_SLAVE_BYTE_TRANSMITTED: EV3
  • (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF): EV3
  • (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL): EV3
  • I2C_EVENT_SLAVE_ACK_FAILURE: EV3_2
  • I2C_EVENT_SLAVE_STOP_DETECTED: EV4
  • I2C_EVENT_MASTER_MODE_SELECT: EV5
  • I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED: EV6
  • I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED: EV6
  • I2C_EVENT_MASTER_BYTE_RECEIVED: EV7
  • I2C_EVENT_MASTER_BYTE_TRANSMITTING: EV8
  • I2C_EVENT_MASTER_BYTE_TRANSMITTED: EV8_2
  • I2C_EVENT_MASTER_MODE_ADDRESS10: EV9
Note:
For detailed description of Events, please refer to section I2C_Events in stm32f4xx_i2c.h file.
Return values:
An ErrorStatus enumeration value:

  • SUCCESS: Last event is equal to the I2C_EVENT
  • ERROR: Last event is different from the I2C_EVENT
void I2C_ClearFlag ( I2C_TypeDef *  I2Cx,
uint32_t  I2C_FLAG 
)

Clears the I2Cx's pending flags.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_FLAG,: specifies the flag to clear. This parameter can be any combination of the following values:

  • I2C_FLAG_SMBALERT: SMBus Alert flag
  • I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
  • I2C_FLAG_PECERR: PEC error in reception flag
  • I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
  • I2C_FLAG_AF: Acknowledge failure flag
  • I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
  • I2C_FLAG_BERR: Bus error flag
Note:
STOPF (STOP detection) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
ADD10 (10-bit header sent) is cleared by software sequence: a read operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the second byte of the address in DR register.
BTF (Byte Transfer Finished) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a read/write to I2C_DR register (I2C_SendData()).
ADDR (Address sent) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to I2C_SR2 register ((void)(I2Cx->SR2)).
SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR register (I2C_SendData()).
Return values:
None 
void I2C_ClearITPendingBit ( I2C_TypeDef *  I2Cx,
uint32_t  I2C_IT 
)

Clears the I2Cx's interrupt pending bits.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_IT,: specifies the interrupt pending bit to clear. This parameter can be any combination of the following values:

  • I2C_IT_SMBALERT: SMBus Alert interrupt
  • I2C_IT_TIMEOUT: Timeout or Tlow error interrupt
  • I2C_IT_PECERR: PEC error in reception interrupt
  • I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)
  • I2C_IT_AF: Acknowledge failure interrupt
  • I2C_IT_ARLO: Arbitration lost interrupt (Master mode)
  • I2C_IT_BERR: Bus error interrupt
Note:
STOPF (STOP detection) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
ADD10 (10-bit header sent) is cleared by software sequence: a read operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second byte of the address in I2C_DR register.
BTF (Byte Transfer Finished) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetITStatus()) followed by a read/write to I2C_DR register (I2C_SendData()).
ADDR (Address sent) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to I2C_SR2 register ((void)(I2Cx->SR2)).
SB (Start Bit) is cleared by software sequence: a read operation to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to I2C_DR register (I2C_SendData()).
Return values:
None 
void I2C_Cmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C peripheral.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2Cx peripheral. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_DeInit ( I2C_TypeDef *  I2Cx  ) 

Deinitialize the I2Cx peripheral registers to their default reset values.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Return values:
None 
void I2C_DMACmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C DMA requests.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C DMA transfer. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_DMALastTransferCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Specifies that the next DMA transfer is the last one.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C DMA last transfer. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_DualAddressCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C dual addressing mode.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C dual addressing mode. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_FastModeDutyCycleConfig ( I2C_TypeDef *  I2Cx,
uint16_t  I2C_DutyCycle 
)

Selects the specified I2C fast mode duty cycle.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_DutyCycle,: specifies the fast mode duty cycle. This parameter can be one of the following values:

  • I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
  • I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
Return values:
None 
void I2C_GeneralCallCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C general call feature.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C General call. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_GenerateSTART ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Generates I2Cx communication START condition.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C START condition generation. This parameter can be: ENABLE or DISABLE.
Return values:
None. 
void I2C_GenerateSTOP ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Generates I2Cx communication STOP condition.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C STOP condition generation. This parameter can be: ENABLE or DISABLE.
Return values:
None. 
FlagStatus I2C_GetFlagStatus ( I2C_TypeDef *  I2Cx,
uint32_t  I2C_FLAG 
)

Checks whether the specified I2C flag is set or not.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_FLAG,: specifies the flag to check. This parameter can be one of the following values:

  • I2C_FLAG_DUALF: Dual flag (Slave mode)
  • I2C_FLAG_SMBHOST: SMBus host header (Slave mode)
  • I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)
  • I2C_FLAG_GENCALL: General call header flag (Slave mode)
  • I2C_FLAG_TRA: Transmitter/Receiver flag
  • I2C_FLAG_BUSY: Bus busy flag
  • I2C_FLAG_MSL: Master/Slave flag
  • I2C_FLAG_SMBALERT: SMBus Alert flag
  • I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
  • I2C_FLAG_PECERR: PEC error in reception flag
  • I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
  • I2C_FLAG_AF: Acknowledge failure flag
  • I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
  • I2C_FLAG_BERR: Bus error flag
  • I2C_FLAG_TXE: Data register empty flag (Transmitter)
  • I2C_FLAG_RXNE: Data register not empty (Receiver) flag
  • I2C_FLAG_STOPF: Stop detection flag (Slave mode)
  • I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
  • I2C_FLAG_BTF: Byte transfer finished flag
  • I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL" Address matched flag (Slave mode)"ENDAD"
  • I2C_FLAG_SB: Start bit flag (Master mode)
Return values:
The new state of I2C_FLAG (SET or RESET).
ITStatus I2C_GetITStatus ( I2C_TypeDef *  I2Cx,
uint32_t  I2C_IT 
)

Checks whether the specified I2C interrupt has occurred or not.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_IT,: specifies the interrupt source to check. This parameter can be one of the following values:

  • I2C_IT_SMBALERT: SMBus Alert flag
  • I2C_IT_TIMEOUT: Timeout or Tlow error flag
  • I2C_IT_PECERR: PEC error in reception flag
  • I2C_IT_OVR: Overrun/Underrun flag (Slave mode)
  • I2C_IT_AF: Acknowledge failure flag
  • I2C_IT_ARLO: Arbitration lost flag (Master mode)
  • I2C_IT_BERR: Bus error flag
  • I2C_IT_TXE: Data register empty flag (Transmitter)
  • I2C_IT_RXNE: Data register not empty (Receiver) flag
  • I2C_IT_STOPF: Stop detection flag (Slave mode)
  • I2C_IT_ADD10: 10-bit header sent flag (Master mode)
  • I2C_IT_BTF: Byte transfer finished flag
  • I2C_IT_ADDR: Address sent flag (Master mode) "ADSL" Address matched flag (Slave mode)"ENDAD"
  • I2C_IT_SB: Start bit flag (Master mode)
Return values:
The new state of I2C_IT (SET or RESET).
uint32_t I2C_GetLastEvent ( I2C_TypeDef *  I2Cx  ) 

Returns the last I2Cx Event.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Note:
For detailed description of Events, please refer to section I2C_Events in stm32f4xx_i2c.h file.
Return values:
The last event
uint8_t I2C_GetPEC ( I2C_TypeDef *  I2Cx  ) 

Returns the PEC value for the specified I2C.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Return values:
The PEC value.
void I2C_Init ( I2C_TypeDef *  I2Cx,
I2C_InitTypeDef *  I2C_InitStruct 
)

Initializes the I2Cx peripheral according to the specified parameters in the I2C_InitStruct.

Note:
To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency (I2C peripheral input clock) must be a multiple of 10 MHz.
Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_InitStruct,: pointer to a I2C_InitTypeDef structure that contains the configuration information for the specified I2C peripheral.
Return values:
None 
void I2C_ITConfig ( I2C_TypeDef *  I2Cx,
uint16_t  I2C_IT,
FunctionalState  NewState 
)

Enables or disables the specified I2C interrupts.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_IT,: specifies the I2C interrupts sources to be enabled or disabled. This parameter can be any combination of the following values:

  • I2C_IT_BUF: Buffer interrupt mask
  • I2C_IT_EVT: Event interrupt mask
  • I2C_IT_ERR: Error interrupt mask
NewState,: new state of the specified I2C interrupts. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_NACKPositionConfig ( I2C_TypeDef *  I2Cx,
uint16_t  I2C_NACKPosition 
)

Selects the specified I2C NACK position in master receiver mode.

Note:
This function is useful in I2C Master Receiver mode when the number of data to be received is equal to 2. In this case, this function should be called (with parameter I2C_NACKPosition_Next) before data reception starts,as described in the 2-byte reception procedure recommended in Reference Manual in Section: Master receiver.
Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_NACKPosition,: specifies the NACK position. This parameter can be one of the following values:

  • I2C_NACKPosition_Next: indicates that the next byte will be the last received byte.
  • I2C_NACKPosition_Current: indicates that current byte is the last received byte.
Note:
This function configures the same bit (POS) as I2C_PECPositionConfig() but is intended to be used in I2C mode while I2C_PECPositionConfig() is intended to used in SMBUS mode.
Return values:
None 
void I2C_OwnAddress2Config ( I2C_TypeDef *  I2Cx,
uint8_t  Address 
)

Configures the specified I2C own address2.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Address,: specifies the 7bit I2C own address2.
Return values:
None. 
void I2C_PECPositionConfig ( I2C_TypeDef *  I2Cx,
uint16_t  I2C_PECPosition 
)

Selects the specified I2C PEC position.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_PECPosition,: specifies the PEC position. This parameter can be one of the following values:

  • I2C_PECPosition_Next: indicates that the next byte is PEC
  • I2C_PECPosition_Current: indicates that current byte is PEC
Note:
This function configures the same bit (POS) as I2C_NACKPositionConfig() but is intended to be used in SMBUS mode while I2C_NACKPositionConfig() is intended to used in I2C mode.
Return values:
None 
uint16_t I2C_ReadRegister ( I2C_TypeDef *  I2Cx,
uint8_t  I2C_Register 
)

Reads the specified I2C register and returns its value.

Parameters:
I2C_Register,: specifies the register to read. This parameter can be one of the following values:

  • I2C_Register_CR1: CR1 register.
  • I2C_Register_CR2: CR2 register.
  • I2C_Register_OAR1: OAR1 register.
  • I2C_Register_OAR2: OAR2 register.
  • I2C_Register_DR: DR register.
  • I2C_Register_SR1: SR1 register.
  • I2C_Register_SR2: SR2 register.
  • I2C_Register_CCR: CCR register.
  • I2C_Register_TRISE: TRISE register.
Return values:
The value of the read register.
uint8_t I2C_ReceiveData ( I2C_TypeDef *  I2Cx  ) 

Returns the most recent received data by the I2Cx peripheral.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Return values:
The value of the received data.
void I2C_Send7bitAddress ( I2C_TypeDef *  I2Cx,
uint8_t  Address,
uint8_t  I2C_Direction 
)

Transmits the address byte to select the slave device.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Address,: specifies the slave address which will be transmitted
I2C_Direction,: specifies whether the I2C device will be a Transmitter or a Receiver. This parameter can be one of the following values

  • I2C_Direction_Transmitter: Transmitter mode
  • I2C_Direction_Receiver: Receiver mode
Return values:
None. 
void I2C_SendData ( I2C_TypeDef *  I2Cx,
uint8_t  Data 
)

Sends a data byte through the I2Cx peripheral.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
Data,: Byte to be transmitted..
Return values:
None 
void I2C_SMBusAlertConfig ( I2C_TypeDef *  I2Cx,
uint16_t  I2C_SMBusAlert 
)

Drives the SMBusAlert pin high or low for the specified I2C.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
I2C_SMBusAlert,: specifies SMBAlert pin level. This parameter can be one of the following values:

  • I2C_SMBusAlert_Low: SMBAlert pin driven low
  • I2C_SMBusAlert_High: SMBAlert pin driven high
Return values:
None 
void I2C_SoftwareResetCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C software reset.

Note:
When software reset is enabled, the I2C IOs are released (this can be useful to recover from bus errors).
Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C software reset. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_StretchClockCmd ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C Clock stretching.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2Cx Clock stretching. This parameter can be: ENABLE or DISABLE.
Return values:
None 
void I2C_StructInit ( I2C_InitTypeDef *  I2C_InitStruct  ) 

Fills each I2C_InitStruct member with its default value.

Parameters:
I2C_InitStruct,: pointer to an I2C_InitTypeDef structure which will be initialized.
Return values:
None 
void I2C_TransmitPEC ( I2C_TypeDef *  I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C PEC transfer.

Parameters:
I2Cx,: where x can be 1, 2 or 3 to select the I2C peripheral.
NewState,: new state of the I2C PEC transmission. This parameter can be: ENABLE or DISABLE.
Return values:
None 
Generated on Fri Jun 22 00:58:30 2012 for STM32F4xx_StdPeriph_Driver by  doxygen 1.6.3