stm32f10x_i2c.c

STM32下做的usb转RS232程序

  {
    /* Disable the selected I2C DMA requests */
    I2Cx->CR2 &= CR2_DMAEN_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_DMALastTransferCmd
* Description    : Specifies that the next DMA transfer is the last one.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C DMA last transfer.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Next DMA end of transfer is the last transfer */
    I2Cx->CR2 |= CR2_LAST_Set;
  }
  else
  {
    /* Next DMA end of transfer is not the last transfer */
    I2Cx->CR2 &= CR2_LAST_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_GenerateSTART
* Description    : Generates I2Cx communication START condition.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C START condition generation.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None.
*******************************************************************************/
void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Generate a START condition */
    I2Cx->CR1 |= CR1_START_Set;
  }
  else
  {
    /* Disable the START condition generation */
    I2Cx->CR1 &= CR1_START_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_GenerateSTOP
* Description    : Generates I2Cx communication STOP condition.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C STOP condition generation.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None.
*******************************************************************************/
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Generate a STOP condition */
    I2Cx->CR1 |= CR1_STOP_Set;
  }
  else
  {
    /* Disable the STOP condition generation */
    I2Cx->CR1 &= CR1_STOP_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_AcknowledgeConfig
* Description    : Enables or disables the specified I2C acknowledge feature.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C Acknowledgement.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None.
*******************************************************************************/
void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the acknowledgement */
    I2Cx->CR1 |= CR1_ACK_Set;
  }
  else
  {
    /* Disable the acknowledgement */
    I2Cx->CR1 &= CR1_ACK_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_OwnAddress2Config
* Description    : Configures the specified I2C own address2.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - Address: specifies the 7bit I2C own address2.
* Output         : None
* Return         : None.
*******************************************************************************/
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, u8 Address)
{
  u16 tmpreg = 0;

  /* Get the old register value */
  tmpreg = I2Cx->OAR2;
  /* Reset I2Cx Own address2 bit [7:1] */
  tmpreg &= OAR2_ADD2_Reset;
  /* Set I2Cx Own address2 */
  tmpreg |= (u16)(Address & (u16)0x00FE);
  /* Store the new register value */
  I2Cx->OAR2 = tmpreg;
}

/*******************************************************************************
* Function Name  : I2C_DualAddressCmd
* Description    : Enables or disables the specified I2C dual addressing mode.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C dual addressing mode.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable dual addressing mode */
    I2Cx->OAR2 |= OAR2_ENDUAL_Set;
  }
  else
  {
    /* Disable dual addressing mode */
    I2Cx->OAR2 &= OAR2_ENDUAL_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_GeneralCallCmd
* Description    : Enables or disables the specified I2C general call feature.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C General call.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable generall call */
    I2Cx->CR1 |= CR1_ENGC_Set;
  }
  else
  {
    /* Disable generall call */
    I2Cx->CR1 &= CR1_ENGC_Reset;
  }
}

/*******************************************************************************
* Function Name  : I2C_ITConfig
* Description    : Enables or disables the specified I2C interrupts.
* Input          : - I2Cx: where x can be 1 or 2 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.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_ITConfig(I2C_TypeDef* I2Cx, u16 I2C_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_I2C_CONFIG_IT(I2C_IT));
  
  if (NewState != DISABLE)
  {
    /* Enable the selected I2C interrupts */
    I2Cx->CR2 |= I2C_IT;
  }
  else
  {
    /* Disable the selected I2C interrupts */
    I2Cx->CR2 &= (u16)~I2C_IT;
  }
}

/*******************************************************************************
* Function Name  : I2C_SendData
* Description    : Sends a data byte through the I2Cx peripheral.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - Data: Byte to be transmitted..
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_SendData(I2C_TypeDef* I2Cx, u8 Data)
{
  /* Write in the DR register the data to be sent */
  I2Cx->DR = Data;
}

/*******************************************************************************
* Function Name  : I2C_ReceiveData
* Description    : Returns the most recent received data by the I2Cx peripheral.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* Output         : None
* Return         : The value of the received data.
*******************************************************************************/
u8 I2C_ReceiveData(I2C_TypeDef* I2Cx)
{
  /* Return the data in the DR register */
  return (u8)I2Cx->DR;
}

/*******************************************************************************
* Function Name  : I2C_Send7bitAddress
* Description    : Transmits the address byte to select the slave device.
* Input          : - I2Cx: where x can be 1 or 2 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
* Output         : None
* Return         : None.
*******************************************************************************/
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, u8 Address, u8 I2C_Direction)
{
  /* Check the parameters */
  assert_param(IS_I2C_DIRECTION(I2C_Direction));

  /* Test on the direction to set/reset the read/write bit */
  if (I2C_Direction != I2C_Direction_Transmitter)
  {
    /* Set the address ADD0 bit0 for read */
    Address |= OAR1_ADD0_Set;
  }
  else
  {
    /* Reset the address bit0 for write */
    Address &= OAR1_ADD0_Reset;
  }
  /* Send the address */
  I2Cx->DR = Address;
}

/*******************************************************************************
* Function Name  : I2C_ReadRegister
* Description    : Reads the specified I2C register and returns its value.
* Input1         : - 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.
* Output         : None
* Return         : The value of the read register.
*******************************************************************************/
u16 I2C_ReadRegister(I2C_TypeDef* I2Cx, u8 I2C_Register)
{
  /* Check the parameters */
  assert_param(IS_I2C_REGISTER(I2C_Register));

  /* Return the selected register value */
  return (*(u16 *)(*((u32 *)&I2Cx) + I2C_Register));
}

/*******************************************************************************
* Function Name  : I2C_SoftwareResetCmd
* Description    : Enables or disables the specified I2C software reset.
* Input          : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
*                  - NewState: new state of the I2C software reset.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Peripheral under reset */