stm32f10x_i2c.c

STM32下做的usb转RS232程序

    I2Cx->CR1 |= CR1_SWRST_Set;
  }
  else
  {
    /* Peripheral not under reset */
    I2Cx->CR1 &= CR1_SWRST_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_SMBusAlertConfig
* Description    : Drives the SMBusAlert pin high or low for the specified I2C.
* Input          : - I2Cx: where x can be 1 or 2 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
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, u16 I2C_SMBusAlert)
{
  /* Check the parameters */
  assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));

  if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
  {
    /* Drive the SMBusAlert pin Low */
    I2Cx->CR1 |= I2C_SMBusAlert_Low;
  }
  else
  {
    /* Drive the SMBusAlert pin High  */
    I2Cx->CR1 &= I2C_SMBusAlert_High;
  }
}

/*******************************************************************************
* Function Name  : I2C_TransmitPEC
* Description    : Enables or disables the specified I2C PEC transfer.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C PEC transmission.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected I2C PEC transmission */
    I2Cx->CR1 |= CR1_PEC_Set;
  }
  else
  {
    /* Disable the selected I2C PEC transmission */
    I2Cx->CR1 &= CR1_PEC_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_PECPositionConfig
* Description    : Selects the specified I2C PEC position.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - I2C_PECPosition: specifies the PEC position. 
*                    This parameter can be one of the following values:
*                       - I2C_PECPosition_Next: PEC bit indicates that current
*                         byte is PEC
*                       - I2C_PECPosition_Current: PEC bit indicates that the
*                         next byte is PEC
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, u16 I2C_PECPosition)
{
  /* Check the parameters */
  assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition));

  if (I2C_PECPosition == I2C_PECPosition_Next)
  {
    /* PEC indicates that the next byte in shift register is PEC */
    I2Cx->CR1 |= I2C_PECPosition_Next;
  }
  else
  {
    /* PEC indicates that the current byte in shift register is PEC */
    I2Cx->CR1 &= I2C_PECPosition_Current;
  }
}

/*******************************************************************************
* Function Name  : I2C_CalculatePEC
* Description    : Enables or disables the PEC value calculation of the
*                  transfered bytes.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2Cx PEC value calculation.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected I2C PEC calculation */
    I2Cx->CR1 |= CR1_ENPEC_Set;
  }
  else
  {
    /* Disable the selected I2C PEC calculation */
    I2Cx->CR1 &= CR1_ENPEC_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_GetPEC
* Description    : Returns the PEC value for the specified I2C.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Output         : None
* Return         : The PEC value.
*******************************************************************************/
u8 I2C_GetPEC(I2C_TypeDef* I2Cx)
{
  u8 pec;

  /* Get the PEC value */
  pec = (I2Cx->SR2) >> 8;
  /* Return the selected I2C PEC register value */
  return pec;
}

/*******************************************************************************
* Function Name  : I2C_ARPCmd
* Description    : Enables or disables the specified I2C ARP.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2Cx ARP. 
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected I2C ARP */
    I2Cx->CR1 |= CR1_ENARP_Set;
  }
  else
  {
    /* Disable the selected I2C ARP */
    I2Cx->CR1 &= CR1_ENARP_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_StretchClockCmd
* Description    : Enables or disables the specified I2C Clock stretching.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2Cx Clock stretching.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState == DISABLE)
  {
    /* Enable the selected I2C Clock stretching */
    I2Cx->CR1 |= CR1_NOSTRETCH_Set;
  }
  else
  {
    /* Disable the selected I2C Clock stretching */
    I2Cx->CR1 &= CR1_NOSTRETCH_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_FastModeDutyCycleConfig
* Description    : Selects the specified I2C fast mode duty cycle.
* Input          : - I2Cx: where x can be 1 or 2 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
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, u16 I2C_DutyCycle)
{
  /* Check the parameters */
  assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));

  if (I2C_DutyCycle != I2C_DutyCycle_16_9)
  {
    /* I2C fast mode Tlow/Thigh=2 */
    I2Cx->CCR &= I2C_DutyCycle_2;
  }
  else
  {
    /* I2C fast mode Tlow/Thigh=16/9 */
    I2Cx->CCR |= I2C_DutyCycle_16_9;
  }
}

/*******************************************************************************
* Function Name  : I2C_GetLastEvent
* Description    : Returns the last I2Cx Event.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Output         : None
* Return         : The last event
*******************************************************************************/
u32 I2C_GetLastEvent(I2C_TypeDef* I2Cx)
{
  u32 LastEvent = 0;
  u32 Flag1 = 0, Flag2 = 0;

  Flag1 = I2Cx->SR1;
  Flag2 = I2Cx->SR2;
  Flag2 = Flag2 << 16;

  /* Get the last event value from I2C status register */
  LastEvent = (Flag1 | Flag2) & I2C_FLAG_Mask;

  /* Return status */
  return LastEvent;
}

/*******************************************************************************
* Function Name  : I2C_CheckEvent
* Description    : Checks whether the last I2Cx Event is equal to the one passed
*                  as parameter.
* Input          : - I2Cx: where x can be 1 or 2 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_ADDRESS_MATCHED   : EV1
*                       - I2C_EVENT_SLAVE_BYTE_RECEIVED     : EV2
*                       - I2C_EVENT_SLAVE_BYTE_TRANSMITTED  : EV3
*                       - I2C_EVENT_SLAVE_ACK_FAILURE       : EV3-1
*                       - I2C_EVENT_MASTER_MODE_SELECT      : EV5
*                       - I2C_EVENT_MASTER_MODE_SELECTED    : EV6
*                       - I2C_EVENT_MASTER_BYTE_RECEIVED    : EV7
*                       - I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8
*                       - I2C_EVENT_MASTER_MODE_ADDRESS10   : EV9
*                       - I2C_EVENT_SLAVE_STOP_DETECTED     : EV4
* Output         : None
* Return         : An ErrorStatus enumuration value:
*                       - SUCCESS: Last event is equal to the I2C_Event
*                       - ERROR: Last event is different from the I2C_Event
*******************************************************************************/
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, u32 I2C_EVENT)
{
  u32 LastEvent = 0;
  u32 Flag1 = 0, Flag2 = 0;
  ErrorStatus status = ERROR;

  /* Check the parameters */
  assert_param(IS_I2C_EVENT(I2C_EVENT));

  Flag1 = I2Cx->SR1;
  Flag2 = I2Cx->SR2;
  Flag2 = Flag2 << 16;

  /* Get the last event value from I2C status register */
  LastEvent = (Flag1 | Flag2) & I2C_FLAG_Mask;

  /* Check whether the last event is equal to I2C_EVENT */
  if (LastEvent == I2C_EVENT )
  {
    /* SUCCESS: last event is equal to I2C_EVENT */
    status = SUCCESS;
  }
  else
  {
    /* ERROR: last event is different from I2C_EVENT */
    status = ERROR;
  }

  /* Return status */
  return status;
}

/*******************************************************************************
* Function Name  : I2C_GetFlagStatus
* Description    : Checks whether the specified I2C flag is set or not.
* Input          : - I2Cx: where x can be 1 or 2 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) 揂DSL