Functions
Collaboration diagram for I2C_Exported_Functions:

Functions

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

Detailed Description

Function Documentation

void I2C_AcknowledgeConfig ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C acknowledge feature.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C Acknowledgement. This parameter can be: ENABLE or DISABLE.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C Acknowledgement. This parameter can be: ENABLE or DISABLE.
Return values
None.Enables or disables the specified I2C acknowledge feature.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the Acknowledge. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 472 of file stm32f4xx_i2c.c.

void I2C_ARPCmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C ARP.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2Cx ARP. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx ARP. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 712 of file stm32f4xx_i2c.c.

void I2C_CalculatePEC ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

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

Enables or disables I2C PEC calculation.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2Cx PEC value calculation. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx PEC calculation. This parameter can be: ENABLE or DISABLE.
Return values
NoneEnables or disables I2C PEC calculation.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx PEC value calculation. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 849 of file stm32f4xx_i2c.c.

ErrorStatus I2C_CheckEvent ( I2C_TypeDef I2Cx,
uint32_t  I2C_EVENT 
)

I2C State Monitoring Functions.

This I2C driver provides three different ways for I2C state monitoring depending on the application requirements and constraints:

1) Basic state monitoring: Using I2C_CheckEvent() function: It compares the status registers (SR1 and SR2) content to a given event (can be the combination of one or more flags). It returns SUCCESS if the current status includes the given flags and returns ERROR if one or more flags are missing in the current status.

  • When to use:
    • This function is suitable for most applications as well as for startup activity since the events are fully described in the product reference manual (RM0008).
    • It is also suitable for users who need to define their own events.
  • Limitations:
    • If an error occurs (ie. error flags are set besides to the monitored flags), the I2C_CheckEvent() function may return SUCCESS despite the communication hold or corrupted real state. In this case, it is advised to use error interrupts to monitor the error events and handle them in the interrupt IRQ handler.

      Note
      For error management, it is advised to use the following functions:

      2) Advanced state monitoring: Using the function I2C_GetLastEvent() which returns the image of both status registers in a single word (uint32_t) (Status Register 2 value is shifted left by 16 bits and concatenated to Status Register 1).

When to use:

  • This function is suitable for the same applications above but it allows to overcome the limitations of I2C_GetFlagStatus() function (see below). The returned value could be compared to events already defined in the library (stm32f10x_i2c.h) or to custom values defined by user.
  • This function is suitable when multiple flags are monitored at the same time.
  • At the opposite of I2C_CheckEvent() function, this function allows user to choose when an event is accepted (when all events flags are set and no other flags are set or just when the needed flags are set like I2C_CheckEvent() function).

Limitations:

  • User may need to define his own events.
  • Same remark concerning the error management is applicable for this function if user decides to check only regular communication flags (and ignores error flags).

3) Flag-based state monitoring: Using the function I2C_GetFlagStatus() which simply returns the status of one single flag (ie. I2C_FLAG_RXNE ...).

  • When to use:
    • This function could be used for specific applications or in debug phase.
    • It is suitable when only one flag checking is needed (most I2C events are monitored through multiple flags).
  • Limitations:
    • When calling this function, the Status register is accessed. Some flags are cleared when the status register is accessed. So checking the status of one Flag, may clear other ones.
    • Function may need to be called twice or more in order to monitor one single event.

1) Basic state monitoring

I2C State Monitoring Functions.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_EVENTspecifies 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
AnErrorStatus enumeration value:
  • SUCCESS: Last event is equal to the I2C_EVENT
  • ERROR: Last event is different from the I2C_EVENT

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

This I2C driver provides three different ways for I2C state monitoring depending on the application requirements and constraints:

1) Basic state monitoring: Using I2C_CheckEvent() function: It compares the status registers (SR1 and SR2) content to a given event (can be the combination of one or more flags). It returns SUCCESS if the current status includes the given flags and returns ERROR if one or more flags are missing in the current status.

  • When to use:
    • This function is suitable for most applications as well as for startup activity since the events are fully described in the product reference manual (RM0008).
    • It is also suitable for users who need to define their own events.
  • Limitations:
    • If an error occurs (ie. error flags are set besides to the monitored flags), the I2C_CheckEvent() function may return SUCCESS despite the communication hold or corrupted real state. In this case, it is advised to use error interrupts to monitor the error events and handle them in the interrupt IRQ handler.

      Note
      For error management, it is advised to use the following functions:

      2) Advanced state monitoring: Using the function I2C_GetLastEvent() which returns the image of both status registers in a single word (uint32_t) (Status Register 2 value is shifted left by 16 bits and concatenated to Status Register 1).

When to use:

  • This function is suitable for the same applications above but it allows to overcome the mentioned limitation of I2C_GetFlagStatus() function. The returned value could be compared to events already defined in the library (stm32f10x_i2c.h) or to custom values defined by user.
  • This function is suitable when multiple flags are monitored at the same time.
  • At the opposite of I2C_CheckEvent() function, this function allows user to choose when an event is accepted (when all events flags are set and no other flags are set or just when the needed flags are set like I2C_CheckEvent() function).

Limitations:

  • User may need to define his own events.
  • Same remark concerning the error management is applicable for this function if user decides to check only regular communication flags (and ignores error flags).

3) Flag-based state monitoring: Using the function I2C_GetFlagStatus() which simply returns the status of one single flag (ie. I2C_FLAG_RXNE ...).

  • When to use:
    • This function could be used for specific applications or in debug phase.
    • It is suitable when only one flag checking is needed (most I2C events are monitored through multiple flags).
  • Limitations:
    • When calling this function, the Status register is accessed. Some flags are cleared when the status register is accessed. So checking the status of one Flag, may clear other ones.
    • Function may need to be called twice or more in order to monitor one single event.

For detailed description of Events, please refer to section I2C_Events in stm32f10x_i2c.h file.

1) Basic state monitoring Checks whether the last I2Cx Event is equal to the one passed as parameter.

Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_EVENTspecifies 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 stm32f10x_i2c.h file.
Return values
AnErrorStatus enumeration value:
  • SUCCESS: Last event is equal to the I2C_EVENT
  • ERROR: Last event is different from the I2C_EVENT

Definition at line 1152 of file stm32f4xx_i2c.c.

void I2C_ClearFlag ( I2C_TypeDef I2Cx,
uint32_t  I2C_FLAG 
)

Clears the I2Cx's pending flags.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_FLAGspecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_FLAGspecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_FLAGspecifies the flag to clear. This parameter can be any combination of the following values:
  • I2C_FLAG_ADDR: Address matched (slave mode)
  • I2C_FLAG_NACKF: NACK received flag
  • I2C_FLAG_STOPF: STOP detection flag
  • I2C_FLAG_BERR: Bus error
  • I2C_FLAG_ARLO: Arbitration lost
  • I2C_FLAG_OVR: Overrun/Underrun
  • I2C_FLAG_PECERR: PEC error in reception
  • I2C_FLAG_TIMEOUT: Timeout or Tlow detection flag
  • I2C_FLAG_ALERT: SMBus Alert
Return values
Thenew state of I2C_FLAG (SET or RESET).

Definition at line 1332 of file stm32f4xx_i2c.c.

void I2C_ClearITPendingBit ( I2C_TypeDef I2Cx,
uint32_t  I2C_IT 
)

Clears the I2Cx's interrupt pending bits.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_ITspecifies 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
NoneClears the I2Cx's interrupt pending bits.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_ITspecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_ITspecifies the interrupt pending bit to clear. This parameter can be any combination of the following values:
  • I2C_IT_ADDR: Address matched (slave mode)
  • I2C_IT_NACKF: NACK received flag
  • I2C_IT_STOPF: STOP detection flag
  • I2C_IT_BERR: Bus error
  • I2C_IT_ARLO: Arbitration lost
  • I2C_IT_OVR: Overrun/Underrun
  • I2C_IT_PECERR: PEC error in reception
  • I2C_IT_TIMEOUT: Timeout or Tlow detection flag
  • I2C_IT_ALERT: SMBus Alert
Return values
Thenew state of I2C_IT (SET or RESET).

Definition at line 1426 of file stm32f4xx_i2c.c.

void I2C_Cmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C peripheral.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2Cx peripheral. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx peripheral. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx peripheral. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 313 of file stm32f4xx_i2c.c.

void I2C_DeInit ( I2C_TypeDef I2Cx)

Deinitialize the I2Cx peripheral registers to their default reset values.

Deinitializes the I2Cx peripheral registers to their default reset values.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Return values
NoneDeinitialize the I2Cx peripheral registers to their default reset values.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Return values
None

Definition at line 137 of file stm32f4xx_i2c.c.

void I2C_DMACmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C DMA requests.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C DMA transfer. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C DMA transfer. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 904 of file stm32f4xx_i2c.c.

void I2C_DMALastTransferCmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Specifies that the next DMA transfer is the last one.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C DMA last transfer. This parameter can be: ENABLE or DISABLE.
Return values
NoneSpecifies that the next DMA transfer is the last one.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C DMA last transfer. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 928 of file stm32f4xx_i2c.c.

void I2C_DualAddressCmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C dual addressing mode.

Enables or disables the I2C own address 2.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C dual addressing mode. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C own address 2. This parameter can be: ENABLE or DISABLE.
Return values
NoneEnables or disables the I2C own address 2.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C dual addressing mode. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 522 of file stm32f4xx_i2c.c.

void I2C_FastModeDutyCycleConfig ( I2C_TypeDef I2Cx,
uint16_t  I2C_DutyCycle 
)

Selects the specified I2C fast mode duty cycle.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_DutyCyclespecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_DutyCyclespecifies 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

Definition at line 622 of file stm32f4xx_i2c.c.

void I2C_GeneralCallCmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C general call feature.

Enables or disables the I2C general call mode.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C General call. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C general call mode. This parameter can be: ENABLE or DISABLE.
Return values
NoneEnables or disables the I2C general call mode.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C General call. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 546 of file stm32f4xx_i2c.c.

void I2C_GenerateSTART ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Generates I2Cx communication START condition.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C START condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C START condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C START condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 393 of file stm32f4xx_i2c.c.

void I2C_GenerateSTOP ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Generates I2Cx communication STOP condition.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C STOP condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C STOP condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C STOP condition generation. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 417 of file stm32f4xx_i2c.c.

FlagStatus I2C_GetFlagStatus ( I2C_TypeDef I2Cx,
uint32_t  I2C_FLAG 
)

Checks whether the specified I2C flag is set or not.

3) Flag-based state monitoring

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_FLAGspecifies 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
Thenew state of I2C_FLAG (SET or RESET).

3) Flag-based state monitoring

Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_FLAGspecifies 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)"ENDA"
  • I2C_FLAG_SB: Start bit flag (Master mode)
Return values
Thenew state of I2C_FLAG (SET or RESET).
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_FLAGspecifies the flag to check. This parameter can be one of the following values:
  • I2C_FLAG_TXE: Transmit data register empty
  • I2C_FLAG_TXIS: Transmit interrupt status
  • I2C_FLAG_RXNE: Receive data register not empty
  • I2C_FLAG_ADDR: Address matched (slave mode)
  • I2C_FLAG_NACKF: NACK received flag
  • I2C_FLAG_STOPF: STOP detection flag
  • I2C_FLAG_TC: Transfer complete (master mode)
  • I2C_FLAG_TCR: Transfer complete reload
  • I2C_FLAG_BERR: Bus error
  • I2C_FLAG_ARLO: Arbitration lost
  • I2C_FLAG_OVR: Overrun/Underrun
  • I2C_FLAG_PECERR: PEC error in reception
  • I2C_FLAG_TIMEOUT: Timeout or Tlow detection flag
  • I2C_FLAG_ALERT: SMBus Alert
  • I2C_FLAG_BUSY: Bus busy
Return values
Thenew state of I2C_FLAG (SET or RESET).

Definition at line 1255 of file stm32f4xx_i2c.c.

ITStatus I2C_GetITStatus ( I2C_TypeDef I2Cx,
uint32_t  I2C_IT 
)

Checks whether the specified I2C interrupt has occurred or not.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_ITspecifies 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
Thenew state of I2C_IT (SET or RESET).
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_ITspecifies 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
Thenew state of I2C_IT (SET or RESET).
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_ITspecifies the interrupt source to check. This parameter can be one of the following values:
  • I2C_IT_TXIS: Transmit interrupt status
  • I2C_IT_RXNE: Receive data register not empty
  • I2C_IT_ADDR: Address matched (slave mode)
  • I2C_IT_NACKF: NACK received flag
  • I2C_IT_STOPF: STOP detection flag
  • I2C_IT_TC: Transfer complete (master mode)
  • I2C_IT_TCR: Transfer complete reload
  • I2C_IT_BERR: Bus error
  • I2C_IT_ARLO: Arbitration lost
  • I2C_IT_OVR: Overrun/Underrun
  • I2C_IT_PECERR: PEC error in reception
  • I2C_IT_TIMEOUT: Timeout or Tlow detection flag
  • I2C_IT_ALERT: SMBus Alert
Return values
Thenew state of I2C_IT (SET or RESET).

Definition at line 1366 of file stm32f4xx_i2c.c.

uint32_t I2C_GetLastEvent ( I2C_TypeDef I2Cx)

Returns the last I2Cx Event.

2) Advanced state monitoring

Parameters
I2Cxwhere 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
Thelast event

2) Advanced state monitoring

Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Note
: For detailed description of Events, please refer to section I2C_Events in stm32f10x_i2c.h file.
Return values
Thelast event

Definition at line 1200 of file stm32f4xx_i2c.c.

uint8_t I2C_GetPEC ( I2C_TypeDef I2Cx)

Returns the PEC value for the specified I2C.

Returns the I2C PEC.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
Return values
ThePEC value.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Return values
Thevalue of the PEC .

Returns the I2C PEC.

Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Return values
ThePEC value.

Definition at line 871 of file stm32f4xx_i2c.c.

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
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_InitStructpointer to a I2C_InitTypeDef structure that contains the configuration information for the specified I2C peripheral.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_InitStructpointer to a I2C_InitTypeDef structure that contains the configuration information for the specified I2C peripheral.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_InitStructpointer to a I2C_InitTypeDef structure that contains the configuration information for the specified I2C peripheral.
Return values
None

Definition at line 180 of file stm32f4xx_i2c.c.

void I2C_ITConfig ( I2C_TypeDef I2Cx,
uint16_t  I2C_IT,
FunctionalState  NewState 
)

Enables or disables the specified I2C interrupts.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_ITspecifies 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
NewStatenew state of the specified I2C interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_ITspecifies 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
NewStatenew state of the specified I2C interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 1093 of file stm32f4xx_i2c.c.

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
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_NACKPositionspecifies 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
NoneSelects the specified I2C NACK position in master receiver mode.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_NACKPositionspecifies 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

Definition at line 660 of file stm32f4xx_i2c.c.

void I2C_OwnAddress2Config ( I2C_TypeDef I2Cx,
uint8_t  Address 
)

Configures the specified I2C own address2.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
Addressspecifies the 7bit I2C own address2.
Return values
None.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Addressspecifies the 7bit I2C own address2.
Return values
None.

Definition at line 495 of file stm32f4xx_i2c.c.

void I2C_PECPositionConfig ( I2C_TypeDef I2Cx,
uint16_t  I2C_PECPosition 
)

Selects the specified I2C PEC position.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_PECPositionspecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_PECPositionspecifies 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

Definition at line 825 of file stm32f4xx_i2c.c.

uint16_t I2C_ReadRegister ( I2C_TypeDef I2Cx,
uint8_t  I2C_Register 
)

Reads the specified I2C register and returns its value.

Parameters
I2C_Registerspecifies 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
Thevalue of the read register.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_Registerspecifies 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_TIMINGR: TIMING register.
  • I2C_Register_TIMEOUTR: TIMEOUTR register.
  • I2C_Register_ISR: ISR register.
  • I2C_Register_ICR: ICR register.
  • I2C_Register_PECR: PECR register.
  • I2C_Register_RXDR: RXDR register.
  • I2C_Register_TXDR: TXDR register.
Return values
Thevalue of the read register.

Definition at line 1066 of file stm32f4xx_i2c.c.

uint8_t I2C_ReceiveData ( I2C_TypeDef I2Cx)

Returns the most recent received data by the I2Cx peripheral.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
Return values
Thevalue of the received data.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Return values
Thevalue of the received data.

Definition at line 763 of file stm32f4xx_i2c.c.

void I2C_Send7bitAddress ( I2C_TypeDef I2Cx,
uint8_t  Address,
uint8_t  I2C_Direction 
)

Transmits the address byte to select the slave device.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
Addressspecifies the slave address which will be transmitted
I2C_Directionspecifies 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.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
Addressspecifies the slave address which will be transmitted
I2C_Directionspecifies 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.

Definition at line 445 of file stm32f4xx_i2c.c.

void I2C_SendData ( I2C_TypeDef I2Cx,
uint8_t  Data 
)

Sends a data byte through the I2Cx peripheral.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
DataByte to be transmitted..
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
DataByte to be transmitted..
Return values
None

Definition at line 750 of file stm32f4xx_i2c.c.

void I2C_SMBusAlertConfig ( I2C_TypeDef I2Cx,
uint16_t  I2C_SMBusAlert 
)

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

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
I2C_SMBusAlertspecifies 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
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
I2C_SMBusAlertspecifies 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

Definition at line 688 of file stm32f4xx_i2c.c.

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
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C software reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C software reset. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 572 of file stm32f4xx_i2c.c.

void I2C_StretchClockCmd ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C Clock stretching.

Enables or disables the I2C Clock stretching.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2Cx Clock stretching. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx Clock stretching. This parameter can be: ENABLE or DISABLE.
Return values
NoneEnables or disables the I2C Clock stretching.
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2Cx Clock stretching. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 596 of file stm32f4xx_i2c.c.

void I2C_StructInit ( I2C_InitTypeDef I2C_InitStruct)

Fills each I2C_InitStruct member with its default value.

Parameters
I2C_InitStructpointer to an I2C_InitTypeDef structure which will be initialized.
Return values
None

Definition at line 289 of file stm32f4xx_i2c.c.

void I2C_TransmitPEC ( I2C_TypeDef I2Cx,
FunctionalState  NewState 
)

Enables or disables the specified I2C PEC transfer.

Parameters
I2Cxwhere x can be 1, 2 or 3 to select the I2C peripheral.
NewStatenew state of the I2C PEC transmission. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
I2Cxwhere x can be 1 or 2 to select the I2C peripheral.
NewStatenew state of the I2C PEC transmission. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 794 of file stm32f4xx_i2c.c.



rosflight_firmware
Author(s): Daniel Koch , James Jackson
autogenerated on Fri Oct 9 2020 03:17:20