stm32_eth.c

stm32-eth例子

     ((DMARxDescToGet->Status & ETH_DMARxDesc_FS) != (uint32_t)RESET))
  {
    /* Get the size of the packet: including 4 bytes of the CRC */
    frameLength = ETH_GetDMARxDescFrameLength(DMARxDescToGet);
  }
 
 /* Return Frame Length */ 
 return frameLength;
}

/**
  * @brief  Drop a Received packet (too small packet, etc...)
  * @param  None
  * @retval : None
  */
void ETH_DropRxPkt(void)
{
  /* Set Own bit of the Rx descriptor Status: gives the buffer back to ETHERNET DMA */
  DMARxDescToGet->Status = ETH_DMARxDesc_OWN;  
  /* Chained Mode */
  if((DMARxDescToGet->ControlBufferSize & ETH_DMARxDesc_RCH) != (uint32_t)RESET)
  {
    /* Selects the next DMA Rx descriptor list for next buffer read */
    DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);
  }
  else /* Ring Mode */
  {
    if((DMARxDescToGet->ControlBufferSize & ETH_DMARxDesc_RER) != (uint32_t)RESET)
    {
      /* Selects the next DMA Rx descriptor list for next buffer read: this will
         be the first Rx descriptor in this case */
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (ETH->DMARDLAR);
    }
    else
    {
      /* Selects the next DMA Rx descriptor list for next buffer read */
      DMARxDescToGet = (ETH_DMADESCTypeDef*) ((uint32_t)DMARxDescToGet + 0x10 + ((ETH->DMABMR & ETH_DMABMR_DSL) >> 2));
    }
  }
}

/*---------------------------------  PHY  ------------------------------------*/
/**
  * @brief  Read a PHY register
  * @param PHYAddress: PHY device address, is the index of one of supported
  *   32 PHY devices. 
  *   This parameter can be one of the following values: 0,..,31                  
  * @param PHYReg: PHY register address, is the index of one of the 32
  *   PHY register. 
  *   This parameter can be one of the following values: 
  * @arg PHY_BCR    : Tranceiver Basic Control Register 
  * @arg PHY_BSR    : Tranceiver Basic Status Register 
  * @arg PHY_SR     : Tranceiver Status Register    
  * @arg More PHY register could be read depending on the used PHY
  * @retval : ETH_ERROR: in case of timeout
  *   MAC MIIDR register value: Data read from the selected PHY register (correct read )
  */
uint16_t ETH_ReadPHYRegister(uint16_t PHYAddress, uint16_t PHYReg)
{
  uint32_t tmpreg = 0;     
__IO uint32_t timeout = 0;
  /* Check the parameters */
  assert_param(IS_ETH_PHY_ADDRESS(PHYAddress));
  assert_param(IS_ETH_PHY_REG(PHYReg));
  
  /* Get the ETHERNET MACMIIAR value */
  tmpreg = ETH->MACMIIAR;
  /* Keep only the CSR Clock Range CR[2:0] bits value */
  tmpreg &= ~MACMIIAR_CR_Mask;
  /* Prepare the MII address register value */
  tmpreg |=(((uint32_t)PHYAddress<<11) & ETH_MACMIIAR_PA); /* Set the PHY device address */
  tmpreg |=(((uint32_t)PHYReg<<6) & ETH_MACMIIAR_MR);      /* Set the PHY register address */
  tmpreg &= ~ETH_MACMIIAR_MW;                              /* Set the read mode */
  tmpreg |= ETH_MACMIIAR_MB;                               /* Set the MII Busy bit */
  /* Write the result value into the MII Address register */
  ETH->MACMIIAR = tmpreg;
  /* Check for the Busy flag */
  do
  {
    timeout++;
    tmpreg = ETH->MACMIIAR;
  } while ((tmpreg & ETH_MACMIIAR_MB) && (timeout < (uint32_t)PHY_READ_TO));
  /* Return ERROR in case of timeout */
  if(timeout == PHY_READ_TO)
  {
    return (uint16_t)ETH_ERROR;
  }
  
  /* Return data register value */
  return (uint16_t)(ETH->MACMIIDR);
}

/**
  * @brief  Write to a PHY register
  * @param PHYAddress: PHY device address, is the index of one of supported
  *   32 PHY devices. 
  *   This parameter can be one of the following values: 0,..,31
  * @param PHYReg: PHY register address, is the index of one of the 32
  *   PHY register. 
  *   This parameter can be one of the following values: 
  * @arg PHY_BCR    : Tranceiver Control Register  
  * @arg More PHY register could be written depending on the used PHY
  * @param PHYValue: the value to write
  * @retval : ETH_ERROR: in case of timeout
  *   ETH_SUCCESS: for correct write
  */
uint32_t ETH_WritePHYRegister(uint16_t PHYAddress, uint16_t PHYReg, uint16_t PHYValue)
{
  uint32_t tmpreg = 0;     
  __IO uint32_t timeout = 0;
  /* Check the parameters */
  assert_param(IS_ETH_PHY_ADDRESS(PHYAddress));
  assert_param(IS_ETH_PHY_REG(PHYReg));
  
  /* Get the ETHERNET MACMIIAR value */
  tmpreg = ETH->MACMIIAR;
  /* Keep only the CSR Clock Range CR[2:0] bits value */
  tmpreg &= ~MACMIIAR_CR_Mask;
  /* Prepare the MII register address value */
  tmpreg |=(((uint32_t)PHYAddress<<11) & ETH_MACMIIAR_PA); /* Set the PHY device address */
  tmpreg |=(((uint32_t)PHYReg<<6) & ETH_MACMIIAR_MR);      /* Set the PHY register address */
  tmpreg |= ETH_MACMIIAR_MW;                               /* Set the write mode */
  tmpreg |= ETH_MACMIIAR_MB;                               /* Set the MII Busy bit */
  /* Give the value to the MII data register */
  ETH->MACMIIDR = PHYValue;
  /* Write the result value into the MII Address register */
  ETH->MACMIIAR = tmpreg;
  /* Check for the Busy flag */
  do
  {
    timeout++;
    tmpreg = ETH->MACMIIAR;
  } while ((tmpreg & ETH_MACMIIAR_MB) && (timeout < (uint32_t)PHY_WRITE_TO));
  /* Return ERROR in case of timeout */
  if(timeout == PHY_WRITE_TO)
  {
    return ETH_ERROR;
  }
  
  /* Return SUCCESS */
  return ETH_SUCCESS;  
}

/**
  * @brief  Enables or disables the PHY loopBack mode.
  * @param PHYAddress: PHY device address, is the index of one of supported
  *   32 PHY devices. 
  *   This parameter can be one of the following values:                   
  * @param NewState: new state of the PHY loopBack mode.
  *   This parameter can be: ENABLE or DISABLE.    
  *   Note: Don't be confused with ETH_MACLoopBackCmd function
  *   which enables internal loopback at MII level
  * @retval : ETH_ERROR: in case of bad PHY configuration
  *   ETH_SUCCESS: for correct PHY configuration
  */
uint32_t ETH_PHYLoopBackCmd(uint16_t PHYAddress, FunctionalState NewState)
{
  uint16_t tmpreg = 0;
  /* Check the parameters */
  assert_param(IS_ETH_PHY_ADDRESS(PHYAddress));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
    
  /* Get the PHY configuration to update it */
  tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_BCR); 
  
  if (NewState != DISABLE)
  {
    /* Enable the PHY loopback mode */
    tmpreg |= PHY_Loopback;  
  }
  else
  {
    /* Disable the PHY loopback mode: normal mode */
    tmpreg &= (uint16_t)(~(uint16_t)PHY_Loopback);
  }
  /* Update the PHY control register with the new configuration */
  if(ETH_WritePHYRegister(PHYAddress, PHY_BCR, tmpreg) != (uint32_t)RESET)
  {
    return ETH_SUCCESS;
  }
  else
  {
    /* Return SUCCESS */
    return ETH_ERROR; 
  }   
}

/*---------------------------------  MAC  ------------------------------------*/
/**
  * @brief  Enables or disables the MAC transmission.
  * @param NewState: new state of the MAC transmission.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval : None
  */
void ETH_MACTransmissionCmd(FunctionalState NewState)
{ 
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  
  if (NewState != DISABLE)
  {
    /* Enable the MAC transmission */
    ETH->MACCR |= ETH_MACCR_TE;  
  }
  else
  {
    /* Disable the MAC transmission */
    ETH->MACCR &= ~ETH_MACCR_TE;
  }
}

/**
  * @brief  Enables or disables the MAC reception.
  * @param NewState: new state of the MAC reception.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval : None
  */
void ETH_MACReceptionCmd(FunctionalState NewState)
{ 
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  
  if (NewState != DISABLE)
  {
    /* Enable the MAC reception */
    ETH->MACCR |= ETH_MACCR_RE;  
  }
  else
  {
    /* Disable the MAC reception */
    ETH->MACCR &= ~ETH_MACCR_RE;
  }
}

/**
  * @brief  Checks whether the ETHERNET flow control busy bit is set or not.
  * @param  None
  * @retval : The new state of flow control busy status bit (SET or RESET).
  */
FlagStatus ETH_GetFlowControlBusyStatus(void)
{
  FlagStatus bitstatus = RESET;
  /* The Flow Control register should not be written to until this bit is cleared */
  if ((ETH->MACFCR & ETH_MACFCR_FCBBPA) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Initiate a Pause Control Frame (Full-duplex only).
  * @param  None
  * @retval : None
  */
void ETH_InitiatePauseControlFrame(void)  
{ 
  /* When Set In full duplex MAC initiates pause control frame */
  ETH->MACFCR |= ETH_MACFCR_FCBBPA;  
}

/**
  * @brief  Enables or disables the MAC BackPressure operation activation (Half-duplex only).
  * @param NewState: new state of the MAC BackPressure operation activation.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval : None
  */
void ETH_BackPressureActivationCmd(FunctionalState NewState)   
{ 
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
    
  if (NewState != DISABLE)
  {
    /* Activate the MAC BackPressure operation */
    /* In Half duplex: during backpressure, when the MAC receives a new frame,
    the transmitter starts sending a JAM pattern resulting in a collision */
    ETH->MACFCR |= ETH_MACFCR_FCBBPA; 
  }
  else
  {
    /* Desactivate the MAC BackPressure operation */
    ETH->MACFCR &= ~ETH_MACFCR_FCBBPA; 
  } 
}

/**
  * @brief  Checks whether the specified ETHERNET MAC flag is set or not.
  * @param ETH_MAC_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  * @arg ETH_MAC_FLAG_TST  : Time stamp trigger flag   
  * @arg ETH_MAC_FLAG_MMCT : MMC transmit flag  
  * @arg ETH_MAC_FLAG_MMCR : MMC receive flag   
  * @arg ETH_MAC_FLAG_MMC  : MMC flag  
  * @arg ETH_MAC_FLAG_PMT  : PMT flag  
  * @retval : The new state of ETHERNET MAC flag (SET or RESET).
  */
FlagStatus ETH_GetMACFlagStatus(uint32_t ETH_MAC_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_MAC_GET_FLAG(ETH_MAC_FLAG)); 
  if ((ETH->MACSR & ETH_MAC_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Checks whether the specified ETHERNET MAC interrupt has occurred or not.
  * @param ETH_MAC_IT: specifies the interrupt source to check.
  *   This parameter can be one of the following values:
  * @arg ETH_MAC_IT_TST   : Time stamp trigger interrupt  
  * @arg ETH_MAC_IT_MMCT : MMC transmit interrupt