stm32f10x_spi.c

STM32驱动nrf24l01

      
    /* Get the source clock value: based on System Clock value */
    sourceclock = RCC_Clocks.SYSCLK_Frequency;    
#endif /* STM32F10X_CL */    

    /* Compute the Real divider depending on the MCLK output state with a flaoting point */
    if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable)
    {
      /* MCLK output is enabled */
      tmp = (uint16_t)(((((sourceclock / 256) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5);
    }
    else
    {
      /* MCLK output is disabled */
      tmp = (uint16_t)(((((sourceclock / (32 * packetlength)) *10 ) / I2S_InitStruct->I2S_AudioFreq)) + 5);
    }
    
    /* Remove the flaoting point */
    tmp = tmp / 10;  
      
    /* Check the parity of the divider */
    i2sodd = (uint16_t)(tmp & (uint16_t)0x0001);
   
    /* Compute the i2sdiv prescaler */
    i2sdiv = (uint16_t)((tmp - i2sodd) / 2);
   
    /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
    i2sodd = (uint16_t) (i2sodd << 8);
  }
  
  /* Test if the divider is 1 or 0 or greater than 0xFF */
  if ((i2sdiv < 2) || (i2sdiv > 0xFF))
  {
    /* Set the default values */
    i2sdiv = 2;
    i2sodd = 0;
  }

  /* Write to SPIx I2SPR register the computed value */
  SPIx->I2SPR = (uint16_t)(i2sdiv | (uint16_t)(i2sodd | (uint16_t)I2S_InitStruct->I2S_MCLKOutput));  
 
  /* Configure the I2S with the SPI_InitStruct values */
  tmpreg |= (uint16_t)(I2S_Mode_Select | (uint16_t)(I2S_InitStruct->I2S_Mode | \
                  (uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat | \
                  (uint16_t)I2S_InitStruct->I2S_CPOL))));
 
  /* Write to SPIx I2SCFGR */  
  SPIx->I2SCFGR = tmpreg;   
}

/**
  * @brief  Fills each SPI_InitStruct member with its default value.
  * @param  SPI_InitStruct : pointer to a SPI_InitTypeDef structure which will be initialized.
  * @retval None
  */
void SPI_StructInit(SPI_InitTypeDef* SPI_InitStruct)
{
/*--------------- Reset SPI init structure parameters values -----------------*/
  /* Initialize the SPI_Direction member */
  SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  /* initialize the SPI_Mode member */
  SPI_InitStruct->SPI_Mode = SPI_Mode_Slave;
  /* initialize the SPI_DataSize member */
  SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b;
  /* Initialize the SPI_CPOL member */
  SPI_InitStruct->SPI_CPOL = SPI_CPOL_Low;
  /* Initialize the SPI_CPHA member */
  SPI_InitStruct->SPI_CPHA = SPI_CPHA_1Edge;
  /* Initialize the SPI_NSS member */
  SPI_InitStruct->SPI_NSS = SPI_NSS_Hard;
  /* Initialize the SPI_BaudRatePrescaler member */
  SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
  /* Initialize the SPI_FirstBit member */
  SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB;
  /* Initialize the SPI_CRCPolynomial member */
  SPI_InitStruct->SPI_CRCPolynomial = 7;
}

/**
  * @brief  Fills each I2S_InitStruct member with its default value.
  * @param  I2S_InitStruct : pointer to a I2S_InitTypeDef structure which will be initialized.
  * @retval None
  */
void I2S_StructInit(I2S_InitTypeDef* I2S_InitStruct)
{
/*--------------- Reset I2S init structure parameters values -----------------*/
  /* Initialize the I2S_Mode member */
  I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx;
  
  /* Initialize the I2S_Standard member */
  I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips;
  
  /* Initialize the I2S_DataFormat member */
  I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b;
  
  /* Initialize the I2S_MCLKOutput member */
  I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable;
  
  /* Initialize the I2S_AudioFreq member */
  I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default;
  
  /* Initialize the I2S_CPOL member */
  I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low;
}

/**
  * @brief  Enables or disables the specified SPI peripheral.
  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx peripheral. 
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected SPI peripheral */
    SPIx->CR1 |= CR1_SPE_Set;
  }
  else
  {
    /* Disable the selected SPI peripheral */
    SPIx->CR1 &= CR1_SPE_Reset;
  }
}

/**
  * @brief  Enables or disables the specified SPI peripheral (in I2S mode).
  * @param  SPIx: where x can be 2 or 3 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx peripheral. 
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void I2S_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_23_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected SPI peripheral (in I2S mode) */
    SPIx->I2SCFGR |= I2SCFGR_I2SE_Set;
  }
  else
  {
    /* Disable the selected SPI peripheral (in I2S mode) */
    SPIx->I2SCFGR &= I2SCFGR_I2SE_Reset;
  }
}

/**
  * @brief  Enables or disables the specified SPI/I2S interrupts.
  * @param  SPIx: where x can be
  *   - 1, 2 or 3 in SPI mode 
  *   - 2 or 3 in I2S mode
  * @param  SPI_I2S_IT: specifies the SPI/I2S interrupt source to be enabled or disabled. 
  *   This parameter can be one of the following values:
  *     @arg SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
  *     @arg SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
  *     @arg SPI_I2S_IT_ERR: Error interrupt mask
  * @param  NewState: new state of the specified SPI/I2S interrupt.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState)
{
  uint16_t itpos = 0, itmask = 0 ;
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT));

  /* Get the SPI/I2S IT index */
  itpos = SPI_I2S_IT >> 4;

  /* Set the IT mask */
  itmask = (uint16_t)1 << (uint16_t)itpos;

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI/I2S interrupt */
    SPIx->CR2 |= itmask;
  }
  else
  {
    /* Disable the selected SPI/I2S interrupt */
    SPIx->CR2 &= (uint16_t)~itmask;
  }
}

/**
  * @brief  Enables or disables the SPIx/I2Sx DMA interface.
  * @param  SPIx: where x can be
  *   - 1, 2 or 3 in SPI mode 
  *   - 2 or 3 in I2S mode
  * @param  SPI_I2S_DMAReq: specifies the SPI/I2S DMA transfer request to be enabled or disabled. 
  *   This parameter can be any combination of the following values:
  *     @arg SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
  *     @arg SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
  * @param  NewState: new state of the selected SPI/I2S DMA transfer request.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_DMAREQ(SPI_I2S_DMAReq));
  if (NewState != DISABLE)
  {
    /* Enable the selected SPI/I2S DMA requests */
    SPIx->CR2 |= SPI_I2S_DMAReq;
  }
  else
  {
    /* Disable the selected SPI/I2S DMA requests */
    SPIx->CR2 &= (uint16_t)~SPI_I2S_DMAReq;
  }
}

/**
  * @brief  Transmits a Data through the SPIx/I2Sx peripheral.
  * @param  SPIx: where x can be
  *   - 1, 2 or 3 in SPI mode 
  *   - 2 or 3 in I2S mode
  * @param  Data : Data to be transmitted.
  * @retval None
  */
void SPI_I2S_SendData(SPI_TypeDef* SPIx, uint16_t Data)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Write in the DR register the data to be sent */
  SPIx->DR = Data;
}

/**
  * @brief  Returns the most recent received data by the SPIx/I2Sx peripheral. 
  * @param  SPIx: where x can be
  *   - 1, 2 or 3 in SPI mode 
  *   - 2 or 3 in I2S mode
  * @retval The value of the received data.
  */
uint16_t SPI_I2S_ReceiveData(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Return the data in the DR register */
  return SPIx->DR;
}

/**
  * @brief  Configures internally by software the NSS pin for the selected SPI.
  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
  * @param  SPI_NSSInternalSoft: specifies the SPI NSS internal state.
  *   This parameter can be one of the following values:
  *     @arg SPI_NSSInternalSoft_Set: Set NSS pin internally
  *     @arg SPI_NSSInternalSoft_Reset: Reset NSS pin internally
  * @retval None
  */
void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, uint16_t SPI_NSSInternalSoft)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_NSS_INTERNAL(SPI_NSSInternalSoft));
  if (SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset)
  {
    /* Set NSS pin internally by software */
    SPIx->CR1 |= SPI_NSSInternalSoft_Set;
  }
  else
  {
    /* Reset NSS pin internally by software */
    SPIx->CR1 &= SPI_NSSInternalSoft_Reset;
  }
}

/**
  * @brief  Enables or disables the SS output for the selected SPI.
  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx SS output. 
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected SPI SS output */
    SPIx->CR2 |= CR2_SSOE_Set;
  }
  else
  {
    /* Disable the selected SPI SS output */
    SPIx->CR2 &= CR2_SSOE_Reset;
  }
}

/**
  * @brief  Configures the data size for the selected SPI.
  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
  * @param  SPI_DataSize: specifies the SPI data size.
  *   This parameter can be one of the following values:
  *     @arg SPI_DataSize_16b: Set data frame format to 16bit