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/**
  ******************************************************************************
  * @file    stm32f4x7_eth.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    14-October-2011
  * @brief   This file is the low level driver for STM32F407xx/417xx Ethernet Controller.
  *          This driver does not include low level functions for PTP time-stamp.
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4x7_eth.h"
#include "stm32f4xx_rcc.h"
#include <string.h>

/** @addtogroup STM32F4x7_ETH_Driver
  * @brief ETH driver modules
  * @{
  */

/** @defgroup ETH_Private_TypesDefinitions
  * @{
  */
/**
  * @}
  */


/** @defgroup ETH_Private_Defines
  * @{
  */

/**
  * @}
  */

/** @defgroup ETH_Private_Macros
  * @{
  */
/**
  * @}
  */

/** @defgroup ETH_Private_Variables
  * @{
  */

#if defined   (__CC_ARM) /*!< ARM Compiler */
  __align(4)
   ETH_DMADESCTypeDef  DMARxDscrTab[ETH_RXBUFNB];/* Ethernet Rx MA Descriptor */
  __align(4)
   ETH_DMADESCTypeDef  DMATxDscrTab[ETH_TXBUFNB];/* Ethernet Tx DMA Descriptor */
  __align(4)
   uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE]; /* Ethernet Receive Buffer */
  __align(4)
   uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE]; /* Ethernet Transmit Buffer */

#elif defined ( __ICCARM__ ) /*!< IAR Compiler */
  #pragma data_alignment=4
   ETH_DMADESCTypeDef  DMARxDscrTab[ETH_RXBUFNB];/* Ethernet Rx MA Descriptor */
  #pragma data_alignment=4
   ETH_DMADESCTypeDef  DMATxDscrTab[ETH_TXBUFNB];/* Ethernet Tx DMA Descriptor */
  #pragma data_alignment=4
   uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE]; /* Ethernet Receive Buffer */
  #pragma data_alignment=4
   uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE]; /* Ethernet Transmit Buffer */

#elif defined (__GNUC__) /*!< GNU Compiler */
  ETH_DMADESCTypeDef  DMARxDscrTab[ETH_RXBUFNB] __attribute__ ((aligned (4))); /* Ethernet Rx DMA Descriptor */
  ETH_DMADESCTypeDef  DMATxDscrTab[ETH_TXBUFNB] __attribute__ ((aligned (4))); /* Ethernet Tx DMA Descriptor */
  uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE] __attribute__ ((aligned (4))); /* Ethernet Receive Buffer */
  uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE] __attribute__ ((aligned (4))); /* Ethernet Transmit Buffer */

#elif defined  (__TASKING__) /*!< TASKING Compiler */
  __align(4)
   ETH_DMADESCTypeDef  DMARxDscrTab[ETH_RXBUFNB];/* Ethernet Rx MA Descriptor */
  __align(4)
   ETH_DMADESCTypeDef  DMATxDscrTab[ETH_TXBUFNB];/* Ethernet Tx DMA Descriptor */
  __align(4)
   uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE]; /* Ethernet Receive Buffer */
  __align(4)
   uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE]; /* Ethernet Transmit Buffer */

#endif /* __CC_ARM */


/* Global pointers on Tx and Rx descriptor used to track transmit and receive descriptors */
__IO ETH_DMADESCTypeDef  *DMATxDescToSet;
__IO ETH_DMADESCTypeDef  *DMARxDescToGet;


/* Structure used to hold the last received packet descriptors info */

ETH_DMA_Rx_Frame_infos RX_Frame_Descriptor;
__IO ETH_DMA_Rx_Frame_infos *DMA_RX_FRAME_infos;
__IO uint32_t Frame_Rx_index;


/**
  * @}
  */

/** @defgroup ETH_Private_FunctionPrototypes
  * @{
  */
/**
  * @}
  */

/** @defgroup ETH_Private_Functions
  * @{
  */

#ifndef USE_Delay
/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */
static void ETH_Delay(__IO uint32_t nCount)
{
  __IO uint32_t index = 0;
  for(index = nCount; index != 0; index--)
  {
  }
}
#endif /* USE_Delay*/


/******************************************************************************/
/*                           Global ETH MAC/DMA functions                     */
/******************************************************************************/

/**
  * @brief  Deinitializes the ETHERNET peripheral registers to their default reset values.
  * @param  None
  * @retval None
  */
void ETH_DeInit(void)
{
  RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_ETH_MAC, ENABLE);
  RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_ETH_MAC, DISABLE);
}


/**
  * @brief  Fills each ETH_InitStruct member with its default value.
  * @param  ETH_InitStruct: pointer to a ETH_InitTypeDef structure which will be initialized.
  * @retval None
  */
void ETH_StructInit(ETH_InitTypeDef* ETH_InitStruct)
{
  /* ETH_InitStruct members default value */
  /*------------------------   MAC Configuration   ---------------------------*/

  /* PHY Auto-negotiation enabled */
  ETH_InitStruct->ETH_AutoNegotiation = ETH_AutoNegotiation_Enable;
  /* MAC watchdog enabled: cuts-off long frame */
  ETH_InitStruct->ETH_Watchdog = ETH_Watchdog_Enable;
  /* MAC Jabber enabled in Half-duplex mode */
  ETH_InitStruct->ETH_Jabber = ETH_Jabber_Enable;
  /* Ethernet interframe gap set to 96 bits */
  ETH_InitStruct->ETH_InterFrameGap = ETH_InterFrameGap_96Bit;
  /* Carrier Sense Enabled in Half-Duplex mode */
  ETH_InitStruct->ETH_CarrierSense = ETH_CarrierSense_Enable;
  /* PHY speed configured to 100Mbit/s */
  ETH_InitStruct->ETH_Speed = ETH_Speed_100M;
  /* Receive own Frames in Half-Duplex mode enabled */
  ETH_InitStruct->ETH_ReceiveOwn = ETH_ReceiveOwn_Enable;
  /* MAC MII loopback disabled */
  ETH_InitStruct->ETH_LoopbackMode = ETH_LoopbackMode_Disable;
  /* Full-Duplex mode selected */
  ETH_InitStruct->ETH_Mode = ETH_Mode_FullDuplex;
  /* IPv4 and TCP/UDP/ICMP frame Checksum Offload disabled */
  ETH_InitStruct->ETH_ChecksumOffload = ETH_ChecksumOffload_Disable;
  /* Retry Transmission enabled for half-duplex mode */
  ETH_InitStruct->ETH_RetryTransmission = ETH_RetryTransmission_Enable;
  /* Automatic PAD/CRC strip disabled*/
  ETH_InitStruct->ETH_AutomaticPadCRCStrip = ETH_AutomaticPadCRCStrip_Disable;
  /* half-duplex mode retransmission Backoff time_limit = 10 slot times*/
  ETH_InitStruct->ETH_BackOffLimit = ETH_BackOffLimit_10;
  /* half-duplex mode Deferral check disabled */
  ETH_InitStruct->ETH_DeferralCheck = ETH_DeferralCheck_Disable;
  /* Receive all frames disabled */
  ETH_InitStruct->ETH_ReceiveAll = ETH_ReceiveAll_Disable;
  /* Source address filtering (on the optional MAC addresses) disabled */
  ETH_InitStruct->ETH_SourceAddrFilter = ETH_SourceAddrFilter_Disable;
  /* Do not forward control frames that do not pass the address filtering */
  ETH_InitStruct->ETH_PassControlFrames = ETH_PassControlFrames_BlockAll;
  /* Disable reception of Broadcast frames */
  ETH_InitStruct->ETH_BroadcastFramesReception = ETH_BroadcastFramesReception_Disable;
  /* Normal Destination address filtering (not reverse addressing) */
  ETH_InitStruct->ETH_DestinationAddrFilter = ETH_DestinationAddrFilter_Normal;
  /* Promiscuous address filtering mode disabled */
  ETH_InitStruct->ETH_PromiscuousMode = ETH_PromiscuousMode_Disable;
  /* Perfect address filtering for multicast addresses */
  ETH_InitStruct->ETH_MulticastFramesFilter = ETH_MulticastFramesFilter_Perfect;
  /* Perfect address filtering for unicast addresses */
  ETH_InitStruct->ETH_UnicastFramesFilter = ETH_UnicastFramesFilter_Perfect;
  /* Initialize hash table high and low regs */
  ETH_InitStruct->ETH_HashTableHigh = 0x0;
  ETH_InitStruct->ETH_HashTableLow = 0x0;
  /* Flow control config (flow control disabled)*/
  ETH_InitStruct->ETH_PauseTime = 0x0;
  ETH_InitStruct->ETH_ZeroQuantaPause = ETH_ZeroQuantaPause_Disable;
  ETH_InitStruct->ETH_PauseLowThreshold = ETH_PauseLowThreshold_Minus4;
  ETH_InitStruct->ETH_UnicastPauseFrameDetect = ETH_UnicastPauseFrameDetect_Disable;
  ETH_InitStruct->ETH_ReceiveFlowControl = ETH_ReceiveFlowControl_Disable;
  ETH_InitStruct->ETH_TransmitFlowControl = ETH_TransmitFlowControl_Disable;
  /* VLANtag config (VLAN field not checked) */
  ETH_InitStruct->ETH_VLANTagComparison = ETH_VLANTagComparison_16Bit;
  ETH_InitStruct->ETH_VLANTagIdentifier = 0x0;

  /*---------------------- DMA Configuration   -------------------------------*/

  /* Drops frames with with TCP/IP checksum errors */
  ETH_InitStruct->ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Disable;
  /* Store and forward mode enabled for receive */
  ETH_InitStruct->ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;
  /* Flush received frame that created FIFO overflow */
  ETH_InitStruct->ETH_FlushReceivedFrame = ETH_FlushReceivedFrame_Enable;
  /* Store and forward mode enabled for transmit */
  ETH_InitStruct->ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;
  /* Threshold TXFIFO level set to 64 bytes (used when threshold mode is enabled) */
  ETH_InitStruct->ETH_TransmitThresholdControl = ETH_TransmitThresholdControl_64Bytes;
  /* Disable forwarding frames with errors (short frames, CRC,...)*/
  ETH_InitStruct->ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Disable;
  /* Disable undersized good frames */
  ETH_InitStruct->ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Disable;
  /* Threshold RXFIFO level set to 64 bytes (used when Cut-through mode is enabled) */
  ETH_InitStruct->ETH_ReceiveThresholdControl = ETH_ReceiveThresholdControl_64Bytes;
  /* Disable Operate on second frame (transmit a second frame to FIFO without
  waiting status of previous frame*/
  ETH_InitStruct->ETH_SecondFrameOperate = ETH_SecondFrameOperate_Disable;
  /* DMA works on 32-bit aligned start source and destinations addresses */
  ETH_InitStruct->ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;
  /* Enabled Fixed Burst Mode (mix of INC4, INC8, INC16 and SINGLE DMA transactions */
  ETH_InitStruct->ETH_FixedBurst = ETH_FixedBurst_Enable;
  /* DMA transfer max burst length = 32 beats = 32 x 32bits */
  ETH_InitStruct->ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;
  ETH_InitStruct->ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;
  /* DMA Ring mode skip length = 0 */
  ETH_InitStruct->ETH_DescriptorSkipLength = 0x0;
  /* Equal priority (round-robin) between transmit and receive DMA engines */
  ETH_InitStruct->ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_1_1;
}


/**
  * @brief  Initializes the ETHERNET peripheral according to the specified
  *   parameters in the ETH_InitStruct .
  * @param ETH_InitStruct: pointer to a ETH_InitTypeDef structure that contains
  *   the configuration information for the specified ETHERNET peripheral.
  * @param PHYAddress: external PHY address
  * @retval ETH_ERROR: Ethernet initialization failed
  *         ETH_SUCCESS: Ethernet successfully initialized
  */
uint32_t ETH_Init(ETH_InitTypeDef* ETH_InitStruct, uint16_t PHYAddress)
{
  uint32_t RegValue = 0, tmpreg = 0;
  __IO uint32_t i = 0;
  RCC_ClocksTypeDef  rcc_clocks;
  uint32_t hclk = 60000000;
  __IO uint32_t timeout = 0;
  /* Check the parameters */
  /* MAC --------------------------*/
  assert_param(IS_ETH_AUTONEGOTIATION(ETH_InitStruct->ETH_AutoNegotiation));
  assert_param(IS_ETH_WATCHDOG(ETH_InitStruct->ETH_Watchdog));
  assert_param(IS_ETH_JABBER(ETH_InitStruct->ETH_Jabber));
  assert_param(IS_ETH_INTER_FRAME_GAP(ETH_InitStruct->ETH_InterFrameGap));
  assert_param(IS_ETH_CARRIER_SENSE(ETH_InitStruct->ETH_CarrierSense));
  assert_param(IS_ETH_SPEED(ETH_InitStruct->ETH_Speed));
  assert_param(IS_ETH_RECEIVE_OWN(ETH_InitStruct->ETH_ReceiveOwn));
  assert_param(IS_ETH_LOOPBACK_MODE(ETH_InitStruct->ETH_LoopbackMode));
  assert_param(IS_ETH_DUPLEX_MODE(ETH_InitStruct->ETH_Mode));
  assert_param(IS_ETH_CHECKSUM_OFFLOAD(ETH_InitStruct->ETH_ChecksumOffload));
  assert_param(IS_ETH_RETRY_TRANSMISSION(ETH_InitStruct->ETH_RetryTransmission));
  assert_param(IS_ETH_AUTOMATIC_PADCRC_STRIP(ETH_InitStruct->ETH_AutomaticPadCRCStrip));
  assert_param(IS_ETH_BACKOFF_LIMIT(ETH_InitStruct->ETH_BackOffLimit));
  assert_param(IS_ETH_DEFERRAL_CHECK(ETH_InitStruct->ETH_DeferralCheck));
  assert_param(IS_ETH_RECEIVE_ALL(ETH_InitStruct->ETH_ReceiveAll));
  assert_param(IS_ETH_SOURCE_ADDR_FILTER(ETH_InitStruct->ETH_SourceAddrFilter));
  assert_param(IS_ETH_CONTROL_FRAMES(ETH_InitStruct->ETH_PassControlFrames));
  assert_param(IS_ETH_BROADCAST_FRAMES_RECEPTION(ETH_InitStruct->ETH_BroadcastFramesReception));
  assert_param(IS_ETH_DESTINATION_ADDR_FILTER(ETH_InitStruct->ETH_DestinationAddrFilter));
  assert_param(IS_ETH_PROMISCIOUS_MODE(ETH_InitStruct->ETH_PromiscuousMode));
  assert_param(IS_ETH_MULTICAST_FRAMES_FILTER(ETH_InitStruct->ETH_MulticastFramesFilter));
  assert_param(IS_ETH_UNICAST_FRAMES_FILTER(ETH_InitStruct->ETH_UnicastFramesFilter));
  assert_param(IS_ETH_PAUSE_TIME(ETH_InitStruct->ETH_PauseTime));
  assert_param(IS_ETH_ZEROQUANTA_PAUSE(ETH_InitStruct->ETH_ZeroQuantaPause));
  assert_param(IS_ETH_PAUSE_LOW_THRESHOLD(ETH_InitStruct->ETH_PauseLowThreshold));
  assert_param(IS_ETH_UNICAST_PAUSE_FRAME_DETECT(ETH_InitStruct->ETH_UnicastPauseFrameDetect));
  assert_param(IS_ETH_RECEIVE_FLOWCONTROL(ETH_InitStruct->ETH_ReceiveFlowControl));
  assert_param(IS_ETH_TRANSMIT_FLOWCONTROL(ETH_InitStruct->ETH_TransmitFlowControl));
  assert_param(IS_ETH_VLAN_TAG_COMPARISON(ETH_InitStruct->ETH_VLANTagComparison));
  assert_param(IS_ETH_VLAN_TAG_IDENTIFIER(ETH_InitStruct->ETH_VLANTagIdentifier));
  /* DMA --------------------------*/
  assert_param(IS_ETH_DROP_TCPIP_CHECKSUM_FRAME(ETH_InitStruct->ETH_DropTCPIPChecksumErrorFrame));
  assert_param(IS_ETH_RECEIVE_STORE_FORWARD(ETH_InitStruct->ETH_ReceiveStoreForward));
  assert_param(IS_ETH_FLUSH_RECEIVE_FRAME(ETH_InitStruct->ETH_FlushReceivedFrame));
  assert_param(IS_ETH_TRANSMIT_STORE_FORWARD(ETH_InitStruct->ETH_TransmitStoreForward));
  assert_param(IS_ETH_TRANSMIT_THRESHOLD_CONTROL(ETH_InitStruct->ETH_TransmitThresholdControl));
  assert_param(IS_ETH_FORWARD_ERROR_FRAMES(ETH_InitStruct->ETH_ForwardErrorFrames));
  assert_param(IS_ETH_FORWARD_UNDERSIZED_GOOD_FRAMES(ETH_InitStruct->ETH_ForwardUndersizedGoodFrames));
  assert_param(IS_ETH_RECEIVE_THRESHOLD_CONTROL(ETH_InitStruct->ETH_ReceiveThresholdControl));
  assert_param(IS_ETH_SECOND_FRAME_OPERATE(ETH_InitStruct->ETH_SecondFrameOperate));
  assert_param(IS_ETH_ADDRESS_ALIGNED_BEATS(ETH_InitStruct->ETH_AddressAlignedBeats));
  assert_param(IS_ETH_FIXED_BURST(ETH_InitStruct->ETH_FixedBurst));
  assert_param(IS_ETH_RXDMA_BURST_LENGTH(ETH_InitStruct->ETH_RxDMABurstLength));
  assert_param(IS_ETH_TXDMA_BURST_LENGTH(ETH_InitStruct->ETH_TxDMABurstLength));
  assert_param(IS_ETH_DMA_DESC_SKIP_LENGTH(ETH_InitStruct->ETH_DescriptorSkipLength));
  assert_param(IS_ETH_DMA_ARBITRATION_ROUNDROBIN_RXTX(ETH_InitStruct->ETH_DMAArbitration));
  /*-------------------------------- MAC Config ------------------------------*/
  /*---------------------- ETHERNET MACMIIAR Configuration -------------------*/
  /* Get the ETHERNET MACMIIAR value */
  tmpreg = ETH->MACMIIAR;
  /* Clear CSR Clock Range CR[2:0] bits */
  tmpreg &= MACMIIAR_CR_MASK;
  /* Get hclk frequency value */
  RCC_GetClocksFreq(&rcc_clocks);
  hclk = rcc_clocks.HCLK_Frequency;

  /* Set CR bits depending on hclk value */
  if((hclk >= 20000000)&&(hclk < 35000000))
  {
    /* CSR Clock Range between 20-35 MHz */
    tmpreg |= (uint32_t)ETH_MACMIIAR_CR_Div16;
  }
  else if((hclk >= 35000000)&&(hclk < 60000000))
  {
    /* CSR Clock Range between 35-60 MHz */
    tmpreg |= (uint32_t)ETH_MACMIIAR_CR_Div26;
  }
  else if((hclk >= 60000000)&&(hclk < 100000000))
  {
    /* CSR Clock Range between 60-100 MHz */
    tmpreg |= (uint32_t)ETH_MACMIIAR_CR_Div42;
  }
  else if((hclk >= 100000000)&&(hclk < 150000000))
  {
    /* CSR Clock Range between 100-150 MHz */
    tmpreg |= (uint32_t)ETH_MACMIIAR_CR_Div62;
  }
  else /* ((hclk >= 150000000)&&(hclk <= 168000000)) */
  {
    /* CSR Clock Range between 150-168 MHz */
    tmpreg |= (uint32_t)ETH_MACMIIAR_CR_Div102;
  }

  /* Write to ETHERNET MAC MIIAR: Configure the ETHERNET CSR Clock Range */
  ETH->MACMIIAR = (uint32_t)tmpreg;
  /*-------------------- PHY initialization and configuration ----------------*/
  /* Put the PHY in reset mode */
  if(!(ETH_WritePHYRegister(PHYAddress, PHY_BCR, PHY_Reset)))
  {
    /* Return ERROR in case of write timeout */
    return ETH_ERROR;
  }

  /* Delay to assure PHY reset */
  _eth_delay_(PHY_RESET_DELAY);

  if(ETH_InitStruct->ETH_AutoNegotiation != ETH_AutoNegotiation_Disable)
  {
    /* We wait for linked status... */
    do
    {
      timeout++;
    } while (!(ETH_ReadPHYRegister(PHYAddress, PHY_BSR) & PHY_Linked_Status) && (timeout < PHY_READ_TO));

    /* Return ERROR in case of timeout */
    if(timeout == PHY_READ_TO)
    {
      return ETH_ERROR;
    }

    /* Reset Timeout counter */
    timeout = 0;
    /* Enable Auto-Negotiation */
    if(!(ETH_WritePHYRegister(PHYAddress, PHY_BCR, PHY_AutoNegotiation)))
    {
      /* Return ERROR in case of write timeout */
      return ETH_ERROR;
    }

    /* Wait until the auto-negotiation will be completed */
    do
    {
      timeout++;
    } while (!(ETH_ReadPHYRegister(PHYAddress, PHY_BSR) & PHY_AutoNego_Complete) && (timeout < (uint32_t)PHY_READ_TO));

    /* Return ERROR in case of timeout */
    if(timeout == PHY_READ_TO)
    {
      return ETH_ERROR;
    }

    /* Reset Timeout counter */
    timeout = 0;

    /* Read the result of the auto-negotiation */
    RegValue = ETH_ReadPHYRegister(PHYAddress, PHY_SR);

    /* Configure the MAC with the Duplex Mode fixed by the auto-negotiation process */
    if((RegValue & PHY_DUPLEX_STATUS) != (uint32_t)RESET)
    {
      /* Set Ethernet duplex mode to Full-duplex following the auto-negotiation */
      ETH_InitStruct->ETH_Mode = ETH_Mode_FullDuplex;
    }
    else
    {
      /* Set Ethernet duplex mode to Half-duplex following the auto-negotiation */
      ETH_InitStruct->ETH_Mode = ETH_Mode_HalfDuplex;
    }

    /* Configure the MAC with the speed fixed by the auto-negotiation process */
    if(RegValue & PHY_SPEED_STATUS)
    {
      /* Set Ethernet speed to 10M following the auto-negotiation */
      ETH_InitStruct->ETH_Speed = ETH_Speed_10M;
    }
    else
    {
      /* Set Ethernet speed to 100M following the auto-negotiation */
      ETH_InitStruct->ETH_Speed = ETH_Speed_100M;
    }
  }
  else
  {
    if(!ETH_WritePHYRegister(PHYAddress, PHY_BCR, ((uint16_t)(ETH_InitStruct->ETH_Mode >> 3) |
                                                   (uint16_t)(ETH_InitStruct->ETH_Speed >> 1))))
    {
      /* Return ERROR in case of write timeout */
      return ETH_ERROR;
    }
    /* Delay to assure PHY configuration */
    _eth_delay_(PHY_CONFIG_DELAY);

  }
  /*------------------------ ETHERNET MACCR Configuration --------------------*/
  /* Get the ETHERNET MACCR value */
  tmpreg = ETH->MACCR;
  /* Clear WD, PCE, PS, TE and RE bits */
  tmpreg &= MACCR_CLEAR_MASK;
  /* Set the WD bit according to ETH_Watchdog value */
  /* Set the JD: bit according to ETH_Jabber value */
  /* Set the IFG bit according to ETH_InterFrameGap value */
  /* Set the DCRS bit according to ETH_CarrierSense value */
  /* Set the FES bit according to ETH_Speed value */
  /* Set the DO bit according to ETH_ReceiveOwn value */
  /* Set the LM bit according to ETH_LoopbackMode value */
  /* Set the DM bit according to ETH_Mode value */
  /* Set the IPCO bit according to ETH_ChecksumOffload value */
  /* Set the DR bit according to ETH_RetryTransmission value */
  /* Set the ACS bit according to ETH_AutomaticPadCRCStrip value */
  /* Set the BL bit according to ETH_BackOffLimit value */
  /* Set the DC bit according to ETH_DeferralCheck value */
  tmpreg |= (uint32_t)(ETH_InitStruct->ETH_Watchdog |
                  ETH_InitStruct->ETH_Jabber |
                  ETH_InitStruct->ETH_InterFrameGap |
                  ETH_InitStruct->ETH_CarrierSense |
                  ETH_InitStruct->ETH_Speed |
                  ETH_InitStruct->ETH_ReceiveOwn |
                  ETH_InitStruct->ETH_LoopbackMode |
                  ETH_InitStruct->ETH_Mode |
                  ETH_InitStruct->ETH_ChecksumOffload |
                  ETH_InitStruct->ETH_RetryTransmission |
                  ETH_InitStruct->ETH_AutomaticPadCRCStrip |
                  ETH_InitStruct->ETH_BackOffLimit |
                  ETH_InitStruct->ETH_DeferralCheck);
  /* Write to ETHERNET MACCR */
  ETH->MACCR = (uint32_t)tmpreg;

  /*----------------------- ETHERNET MACFFR Configuration --------------------*/
  /* Set the RA bit according to ETH_ReceiveAll value */
  /* Set the SAF and SAIF bits according to ETH_SourceAddrFilter value */
  /* Set the PCF bit according to ETH_PassControlFrames value */
  /* Set the DBF bit according to ETH_BroadcastFramesReception value */
  /* Set the DAIF bit according to ETH_DestinationAddrFilter value */
  /* Set the PR bit according to ETH_PromiscuousMode value */
  /* Set the PM, HMC and HPF bits according to ETH_MulticastFramesFilter value */
  /* Set the HUC and HPF bits according to ETH_UnicastFramesFilter value */
  /* Write to ETHERNET MACFFR */
  ETH->MACFFR = (uint32_t)(ETH_InitStruct->ETH_ReceiveAll |
                          ETH_InitStruct->ETH_SourceAddrFilter |
                          ETH_InitStruct->ETH_PassControlFrames |
                          ETH_InitStruct->ETH_BroadcastFramesReception |
                          ETH_InitStruct->ETH_DestinationAddrFilter |
                          ETH_InitStruct->ETH_PromiscuousMode |
                          ETH_InitStruct->ETH_MulticastFramesFilter |
                          ETH_InitStruct->ETH_UnicastFramesFilter);
  /*--------------- ETHERNET MACHTHR and MACHTLR Configuration ---------------*/
  /* Write to ETHERNET MACHTHR */
  ETH->MACHTHR = (uint32_t)ETH_InitStruct->ETH_HashTableHigh;
  /* Write to ETHERNET MACHTLR */
  ETH->MACHTLR = (uint32_t)ETH_InitStruct->ETH_HashTableLow;
  /*----------------------- ETHERNET MACFCR Configuration --------------------*/
  /* Get the ETHERNET MACFCR value */
  tmpreg = ETH->MACFCR;
  /* Clear xx bits */
  tmpreg &= MACFCR_CLEAR_MASK;

  /* Set the PT bit according to ETH_PauseTime value */
  /* Set the DZPQ bit according to ETH_ZeroQuantaPause value */
  /* Set the PLT bit according to ETH_PauseLowThreshold value */
  /* Set the UP bit according to ETH_UnicastPauseFrameDetect value */
  /* Set the RFE bit according to ETH_ReceiveFlowControl value */
  /* Set the TFE bit according to ETH_TransmitFlowControl value */
  tmpreg |= (uint32_t)((ETH_InitStruct->ETH_PauseTime << 16) |
                   ETH_InitStruct->ETH_ZeroQuantaPause |
                   ETH_InitStruct->ETH_PauseLowThreshold |
                   ETH_InitStruct->ETH_UnicastPauseFrameDetect |
                   ETH_InitStruct->ETH_ReceiveFlowControl |
                   ETH_InitStruct->ETH_TransmitFlowControl);
  /* Write to ETHERNET MACFCR */
  ETH->MACFCR = (uint32_t)tmpreg;
  /*----------------------- ETHERNET MACVLANTR Configuration -----------------*/
  /* Set the ETV bit according to ETH_VLANTagComparison value */
  /* Set the VL bit according to ETH_VLANTagIdentifier value */
  ETH->MACVLANTR = (uint32_t)(ETH_InitStruct->ETH_VLANTagComparison |
                             ETH_InitStruct->ETH_VLANTagIdentifier);

  /*-------------------------------- DMA Config ------------------------------*/
  /*----------------------- ETHERNET DMAOMR Configuration --------------------*/
  /* Get the ETHERNET DMAOMR value */
  tmpreg = ETH->DMAOMR;
  /* Clear xx bits */
  tmpreg &= DMAOMR_CLEAR_MASK;

  /* Set the DT bit according to ETH_DropTCPIPChecksumErrorFrame value */
  /* Set the RSF bit according to ETH_ReceiveStoreForward value */
  /* Set the DFF bit according to ETH_FlushReceivedFrame value */
  /* Set the TSF bit according to ETH_TransmitStoreForward value */
  /* Set the TTC bit according to ETH_TransmitThresholdControl value */
  /* Set the FEF bit according to ETH_ForwardErrorFrames value */
  /* Set the FUF bit according to ETH_ForwardUndersizedGoodFrames value */
  /* Set the RTC bit according to ETH_ReceiveThresholdControl value */
  /* Set the OSF bit according to ETH_SecondFrameOperate value */
  tmpreg |= (uint32_t)(ETH_InitStruct->ETH_DropTCPIPChecksumErrorFrame |
                  ETH_InitStruct->ETH_ReceiveStoreForward |
                  ETH_InitStruct->ETH_FlushReceivedFrame |
                  ETH_InitStruct->ETH_TransmitStoreForward |
                  ETH_InitStruct->ETH_TransmitThresholdControl |
                  ETH_InitStruct->ETH_ForwardErrorFrames |
                  ETH_InitStruct->ETH_ForwardUndersizedGoodFrames |
                  ETH_InitStruct->ETH_ReceiveThresholdControl |
                  ETH_InitStruct->ETH_SecondFrameOperate);
  /* Write to ETHERNET DMAOMR */
  ETH->DMAOMR = (uint32_t)tmpreg;

  /*----------------------- ETHERNET DMABMR Configuration --------------------*/
  /* Set the AAL bit according to ETH_AddressAlignedBeats value */
  /* Set the FB bit according to ETH_FixedBurst value */
  /* Set the RPBL and 4*PBL bits according to ETH_RxDMABurstLength value */
  /* Set the PBL and 4*PBL bits according to ETH_TxDMABurstLength value */
  /* Set the DSL bit according to ETH_DesciptorSkipLength value */
  /* Set the PR and DA bits according to ETH_DMAArbitration value */
  ETH->DMABMR = (uint32_t)(ETH_InitStruct->ETH_AddressAlignedBeats |
                          ETH_InitStruct->ETH_FixedBurst |
                          ETH_InitStruct->ETH_RxDMABurstLength | /* !! if 4xPBL is selected for Tx or Rx it is applied for the other */
                          ETH_InitStruct->ETH_TxDMABurstLength |
                         (ETH_InitStruct->ETH_DescriptorSkipLength << 2) |
                          ETH_InitStruct->ETH_DMAArbitration |
                          ETH_DMABMR_USP); /* Enable use of separate PBL for Rx and Tx */

  #ifdef USE_ENHANCED_DMA_DESCRIPTORS
    /* Enable the Enhanced DMA descriptors */
    ETH->DMABMR |= ETH_DMABMR_EDE;
  #endif /* USE_ENHANCED_DMA_DESCRIPTORS */

  /* Return Ethernet configuration success */
  return ETH_SUCCESS;
}

/**
  * @brief  Enables ENET MAC and DMA reception/transmission
  * @param  None
  * @retval None
  */
void ETH_Start(void)
{
  /* Enable transmit state machine of the MAC for transmission on the MII */
  ETH_MACTransmissionCmd(ENABLE);
  /* Flush Transmit FIFO */
  ETH_FlushTransmitFIFO();
  /* Enable receive state machine of the MAC for reception from the MII */
  ETH_MACReceptionCmd(ENABLE);

  /* Start DMA transmission */
  ETH_DMATransmissionCmd(ENABLE);
  /* Start DMA reception */
  ETH_DMAReceptionCmd(ENABLE);
}


/**
  * @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
  *     @arg ETH_MAC_IT_MMCR : MMC receive interrupt
  *     @arg ETH_MAC_IT_MMC  : MMC interrupt
  *     @arg ETH_MAC_IT_PMT  : PMT interrupt
  * @retval The new state of ETHERNET MAC interrupt (SET or RESET).
  */
ITStatus ETH_GetMACITStatus(uint32_t ETH_MAC_IT)
{
  ITStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_MAC_GET_IT(ETH_MAC_IT));
  if ((ETH->MACSR & ETH_MAC_IT) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}


/**
  * @brief  Enables or disables the specified ETHERNET MAC interrupts.
  * @param  ETH_MAC_IT: specifies the ETHERNET MAC interrupt sources to be
  *   enabled or disabled.
  *   This parameter can be any combination of the following values:
  *     @arg ETH_MAC_IT_TST : Time stamp trigger interrupt
  *     @arg ETH_MAC_IT_PMT : PMT interrupt
  * @param  NewState: new state of the specified ETHERNET MAC interrupts.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MACITConfig(uint32_t ETH_MAC_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_ETH_MAC_IT(ETH_MAC_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected ETHERNET MAC interrupts */
    ETH->MACIMR &= (~(uint32_t)ETH_MAC_IT);
  }
  else
  {
    /* Disable the selected ETHERNET MAC interrupts */
    ETH->MACIMR |= ETH_MAC_IT;
  }
}


/**
  * @brief  Configures the selected MAC address.
  * @param  MacAddr: The MAC address to configure.
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_Address0 : MAC Address0
  *     @arg ETH_MAC_Address1 : MAC Address1
  *     @arg ETH_MAC_Address2 : MAC Address2
  *     @arg ETH_MAC_Address3 : MAC Address3
  * @param  Addr: Pointer on MAC address buffer data (6 bytes).
  * @retval None
  */
void ETH_MACAddressConfig(uint32_t MacAddr, uint8_t *Addr)
{
  uint32_t tmpreg;
  /* Check the parameters */
  assert_param(IS_ETH_MAC_ADDRESS0123(MacAddr));

  /* Calculate the selected MAC address high register */
  tmpreg = ((uint32_t)Addr[5] << 8) | (uint32_t)Addr[4];
  /* Load the selected MAC address high register */
  (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) = tmpreg;
  /* Calculate the selected MAC address low register */
  tmpreg = ((uint32_t)Addr[3] << 24) | ((uint32_t)Addr[2] << 16) | ((uint32_t)Addr[1] << 8) | Addr[0];

  /* Load the selected MAC address low register */
  (*(__IO uint32_t *) (ETH_MAC_ADDR_LBASE + MacAddr)) = tmpreg;
}


/**
  * @brief  Get the selected MAC address.
  * @param  MacAddr: The MAC address to return.
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_Address0 : MAC Address0
  *     @arg ETH_MAC_Address1 : MAC Address1
  *     @arg ETH_MAC_Address2 : MAC Address2
  *     @arg ETH_MAC_Address3 : MAC Address3
  * @param  Addr: Pointer on MAC address buffer data (6 bytes).
  * @retval None
  */
void ETH_GetMACAddress(uint32_t MacAddr, uint8_t *Addr)
{
  uint32_t tmpreg;
  /* Check the parameters */
  assert_param(IS_ETH_MAC_ADDRESS0123(MacAddr));

  /* Get the selected MAC address high register */
  tmpreg =(*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr));

  /* Calculate the selected MAC address buffer */
  Addr[5] = ((tmpreg >> 8) & (uint8_t)0xFF);
  Addr[4] = (tmpreg & (uint8_t)0xFF);
  /* Load the selected MAC address low register */
  tmpreg =(*(__IO uint32_t *) (ETH_MAC_ADDR_LBASE + MacAddr));
  /* Calculate the selected MAC address buffer */
  Addr[3] = ((tmpreg >> 24) & (uint8_t)0xFF);
  Addr[2] = ((tmpreg >> 16) & (uint8_t)0xFF);
  Addr[1] = ((tmpreg >> 8 ) & (uint8_t)0xFF);
  Addr[0] = (tmpreg & (uint8_t)0xFF);
}


/**
  * @brief  Enables or disables the Address filter module uses the specified
  *   ETHERNET MAC address for perfect filtering
  * @param  MacAddr: specifies the ETHERNET MAC address to be used for perfect filtering.
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_Address1 : MAC Address1
  *     @arg ETH_MAC_Address2 : MAC Address2
  *     @arg ETH_MAC_Address3 : MAC Address3
  * @param  NewState: new state of the specified ETHERNET MAC address use.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MACAddressPerfectFilterCmd(uint32_t MacAddr, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_ETH_MAC_ADDRESS123(MacAddr));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected ETHERNET MAC address for perfect filtering */
    (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) |= ETH_MACA1HR_AE;
  }
  else
  {
    /* Disable the selected ETHERNET MAC address for perfect filtering */
    (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) &=(~(uint32_t)ETH_MACA1HR_AE);
  }
}


/**
  * @brief  Set the filter type for the specified ETHERNET MAC address
  * @param  MacAddr: specifies the ETHERNET MAC address
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_Address1 : MAC Address1
  *     @arg ETH_MAC_Address2 : MAC Address2
  *     @arg ETH_MAC_Address3 : MAC Address3
  * @param  Filter: specifies the used frame received field for comparison
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_AddressFilter_SA : MAC Address is used to compare with the
  *                                     SA fields of the received frame.
  *     @arg ETH_MAC_AddressFilter_DA : MAC Address is used to compare with the
  *                                     DA fields of the received frame.
  * @retval None
  */
void ETH_MACAddressFilterConfig(uint32_t MacAddr, uint32_t Filter)
{
  /* Check the parameters */
  assert_param(IS_ETH_MAC_ADDRESS123(MacAddr));
  assert_param(IS_ETH_MAC_ADDRESS_FILTER(Filter));

  if (Filter != ETH_MAC_AddressFilter_DA)
  {
    /* The selected ETHERNET MAC address is used to compare with the SA fields of the
       received frame. */
    (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) |= ETH_MACA1HR_SA;
  }
  else
  {
    /* The selected ETHERNET MAC address is used to compare with the DA fields of the
       received frame. */
    (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) &=(~(uint32_t)ETH_MACA1HR_SA);
  }
}


/**
  * @brief  Set the filter type for the specified ETHERNET MAC address
  * @param  MacAddr: specifies the ETHERNET MAC address
  *   This parameter can be one of the following values:
  *     @arg ETH_MAC_Address1 : MAC Address1
  *     @arg ETH_MAC_Address2 : MAC Address2
  *     @arg ETH_MAC_Address3 : MAC Address3
  * @param  MaskByte: specifies the used address bytes for comparison
  *   This parameter can be any combination of the following values:
  *     @arg ETH_MAC_AddressMask_Byte6 : Mask MAC Address high reg bits [15:8].
  *     @arg ETH_MAC_AddressMask_Byte5 : Mask MAC Address high reg bits [7:0].
  *     @arg ETH_MAC_AddressMask_Byte4 : Mask MAC Address low reg bits [31:24].
  *     @arg ETH_MAC_AddressMask_Byte3 : Mask MAC Address low reg bits [23:16].
  *     @arg ETH_MAC_AddressMask_Byte2 : Mask MAC Address low reg bits [15:8].
  *     @arg ETH_MAC_AddressMask_Byte1 : Mask MAC Address low reg bits [7:0].
  * @retval None
  */
void ETH_MACAddressMaskBytesFilterConfig(uint32_t MacAddr, uint32_t MaskByte)
{
  /* Check the parameters */
  assert_param(IS_ETH_MAC_ADDRESS123(MacAddr));
  assert_param(IS_ETH_MAC_ADDRESS_MASK(MaskByte));

  /* Clear MBC bits in the selected MAC address  high register */
  (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) &=(~(uint32_t)ETH_MACA1HR_MBC);
  /* Set the selected Filter mask bytes */
  (*(__IO uint32_t *) (ETH_MAC_ADDR_HBASE + MacAddr)) |= MaskByte;
}


/******************************************************************************/
/*                           DMA Descriptors functions                        */
/******************************************************************************/

/**
  * @brief  This function should be called to get the received frame (to be used
  * with polling method only).
  * @param  none
  * @retval Structure of type FrameTypeDef
  */
FrameTypeDef ETH_Get_Received_Frame(void)
{
  uint32_t framelength = 0;
  FrameTypeDef frame = {0,0,0};

  /* Get the Frame Length of the received packet: substruct 4 bytes of the CRC */
  framelength = ((DMARxDescToGet->Status & ETH_DMARxDesc_FL) >> ETH_DMARxDesc_FrameLengthShift) - 4;
  frame.length = framelength;

  /* Get the address of the buffer start address */
  /* Check if more than one segment in the frame */
  if (DMA_RX_FRAME_infos->Seg_Count >1)
  {
    frame.buffer =(DMA_RX_FRAME_infos->FS_Rx_Desc)->Buffer1Addr;
  }
  else
  {
    frame.buffer = DMARxDescToGet->Buffer1Addr;
  }

  frame.descriptor = DMARxDescToGet;

  /* Update the ETHERNET DMA global Rx descriptor with next Rx descriptor */
  /* Chained Mode */
  /* Selects the next DMA Rx descriptor list for next buffer to read */
  DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);

  /* Return Frame */
  return (frame);
}


/**
  * @brief  This function should be called when a frame is received using DMA
  *         Receive interrupt, it allows scanning of Rx descriptors to get the
  *         the receive frame (should be used with interrupt mode only)
  * @param  None
  * @retval Structure of type FrameTypeDef
  */
FrameTypeDef ETH_Get_Received_Frame_interrupt(void)
{
  FrameTypeDef frame={0,0,0};
  __IO uint32_t descriptor_scan_counter = 0;

  /* scan descriptors owned by CPU */
  while (((DMARxDescToGet->Status & ETH_DMARxDesc_OWN) == (uint32_t)RESET)&&
        (descriptor_scan_counter<ETH_RXBUFNB))
  {

    /* Just by security */
    descriptor_scan_counter++;

    /* check if first segment in frame */
    if(((DMARxDescToGet->Status & ETH_DMARxDesc_FS) != (uint32_t)RESET)&&
      ((DMARxDescToGet->Status & ETH_DMARxDesc_LS) == (uint32_t)RESET))
    {
      DMA_RX_FRAME_infos->FS_Rx_Desc = DMARxDescToGet;
      DMA_RX_FRAME_infos->Seg_Count = 1;
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);
    }

    /* check if intermediate segment */
    else if (((DMARxDescToGet->Status & ETH_DMARxDesc_LS) == (uint32_t)RESET)&&
            ((DMARxDescToGet->Status & ETH_DMARxDesc_FS) == (uint32_t)RESET))
    {
      (DMA_RX_FRAME_infos->Seg_Count) ++;
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);
    }

    /* should be last segment */
    else
    {
      /* last segment */
      DMA_RX_FRAME_infos->LS_Rx_Desc = DMARxDescToGet;

      (DMA_RX_FRAME_infos->Seg_Count)++;

      /* first segment is last segment */
      if ((DMA_RX_FRAME_infos->Seg_Count)==1)
        DMA_RX_FRAME_infos->FS_Rx_Desc = DMARxDescToGet;

      /* Get the Frame Length of the received packet: substruct 4 bytes of the CRC */
      frame.length = ((DMARxDescToGet->Status & ETH_DMARxDesc_FL) >> ETH_DMARxDesc_FrameLengthShift) - 4;


      /* Get the address of the buffer start address */
      /* Check if more than one segment in the frame */
      if (DMA_RX_FRAME_infos->Seg_Count >1)
      {
        frame.buffer =(DMA_RX_FRAME_infos->FS_Rx_Desc)->Buffer1Addr;
      }
      else
      {
        frame.buffer = DMARxDescToGet->Buffer1Addr;
      }

      frame.descriptor = DMARxDescToGet;

      /* Update the ETHERNET DMA global Rx descriptor with next Rx descriptor */
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);

      /* Return Frame */
      return (frame);
    }
  }
  return (frame);
}


/**
  * @brief  Prepares DMA Tx descriptors to transmit an ethernet frame
  * @param  FrameLength : length of the frame to send
  * @retval error status
  */
uint32_t ETH_Prepare_Transmit_Descriptors(u16 FrameLength)
{
  uint32_t buf_count =0, size=0,i=0;
  __IO ETH_DMADESCTypeDef *DMATxNextDesc;

  /* Check if the descriptor is owned by the ETHERNET DMA (when set) or CPU (when reset) */
  if((DMATxDescToSet->Status & ETH_DMATxDesc_OWN) != (u32)RESET)
  {
    /* Return ERROR: OWN bit set */
    return ETH_ERROR;
  }

  DMATxNextDesc = DMATxDescToSet;

  if (FrameLength > ETH_TX_BUF_SIZE)
  {
    buf_count = FrameLength/ETH_TX_BUF_SIZE;
    if (FrameLength%ETH_TX_BUF_SIZE) buf_count++;
  }
  else buf_count =1;

  if (buf_count ==1)
  {
    /*set LAST and FIRST segment */
    DMATxDescToSet->Status |=ETH_DMATxDesc_FS|ETH_DMATxDesc_LS;
    /* Set frame size */
    DMATxDescToSet->ControlBufferSize = (FrameLength& ETH_DMATxDesc_TBS1);
    /* Set Own bit of the Tx descriptor Status: gives the buffer back to ETHERNET DMA */
    DMATxDescToSet->Status |= ETH_DMATxDesc_OWN;
    DMATxDescToSet= (ETH_DMADESCTypeDef *)(DMATxDescToSet->Buffer2NextDescAddr);
  }
  else
  {
    for (i=0; i< buf_count; i++)
    {
      if (i==0)
      {
        /* Setting the first segment bit */
        DMATxDescToSet->Status |= ETH_DMATxDesc_FS;
      }

      /* Program size */
      DMATxNextDesc->ControlBufferSize = (ETH_TX_BUF_SIZE & ETH_DMATxDesc_TBS1);

      if (i== (buf_count-1))
      {
        /* Setting the last segment bit */
        DMATxNextDesc->Status |= ETH_DMATxDesc_LS;
        size = FrameLength - (buf_count-1)*ETH_TX_BUF_SIZE;
        DMATxNextDesc->ControlBufferSize = (size & ETH_DMATxDesc_TBS1);
      }

      /*give back descriptor to DMA */
      DMATxNextDesc->Status |= ETH_DMATxDesc_OWN;

      DMATxNextDesc = (ETH_DMADESCTypeDef *)(DMATxNextDesc->Buffer2NextDescAddr);
      /* Set Own bit of the Tx descriptor Status: gives the buffer back to ETHERNET DMA */
     }
    DMATxDescToSet = DMATxNextDesc ;
  }

  /* When Tx Buffer unavailable flag is set: clear it and resume transmission */
  if ((ETH->DMASR & ETH_DMASR_TBUS) != (u32)RESET)
  {
    /* Clear TBUS ETHERNET DMA flag */
    ETH->DMASR = ETH_DMASR_TBUS;
    /* Resume DMA transmission*/
    ETH->DMATPDR = 0;
  }

  /* Return SUCCESS */
  return ETH_SUCCESS;
}


/**
  * @brief  Initializes the DMA Rx descriptors in chain mode.
  * @param  DMARxDescTab: Pointer on the first Rx desc list
  * @param  RxBuff: Pointer on the first RxBuffer list
  * @param  RxBuffCount: Number of the used Rx desc in the list
  * @retval None
  */
void ETH_DMARxDescChainInit(ETH_DMADESCTypeDef *DMARxDescTab, uint8_t *RxBuff, uint32_t RxBuffCount)
{
  uint32_t i = 0;
  ETH_DMADESCTypeDef *DMARxDesc;

  /* Set the DMARxDescToGet pointer with the first one of the DMARxDescTab list */
  DMARxDescToGet = DMARxDescTab;
  /* Fill each DMARxDesc descriptor with the right values */
  for(i=0; i < RxBuffCount; i++)
  {
    /* Get the pointer on the ith member of the Rx Desc list */
    DMARxDesc = DMARxDescTab+i;
    /* Set Own bit of the Rx descriptor Status */
    DMARxDesc->Status = ETH_DMARxDesc_OWN;

    /* Set Buffer1 size and Second Address Chained bit */
    DMARxDesc->ControlBufferSize = ETH_DMARxDesc_RCH | (uint32_t)ETH_RX_BUF_SIZE;
    /* Set Buffer1 address pointer */
    DMARxDesc->Buffer1Addr = (uint32_t)(&RxBuff[i*ETH_RX_BUF_SIZE]);

    /* Initialize the next descriptor with the Next Descriptor Polling Enable */
    if(i < (RxBuffCount-1))
    {
      /* Set next descriptor address register with next descriptor base address */
      DMARxDesc->Buffer2NextDescAddr = (uint32_t)(DMARxDescTab+i+1);
    }
    else
    {
      /* For last descriptor, set next descriptor address register equal to the first descriptor base address */
      DMARxDesc->Buffer2NextDescAddr = (uint32_t)(DMARxDescTab);
    }
  }

  /* Set Receive Descriptor List Address Register */
  ETH->DMARDLAR = (uint32_t) DMARxDescTab;


  DMA_RX_FRAME_infos = &RX_Frame_Descriptor;

}

/**
  * @brief  This function polls for a frame reception
  * @param  None
  * @retval Returns 1 when a frame is received, 0 if none.
  */
uint32_t ETH_CheckFrameReceived(void)
{
  /* check if last segment */
  if(((DMARxDescToGet->Status & ETH_DMARxDesc_OWN) == (uint32_t)RESET) &&
     ((DMARxDescToGet->Status & ETH_DMARxDesc_LS) != (uint32_t)RESET))
    {
      DMA_RX_FRAME_infos->LS_Rx_Desc = DMARxDescToGet;
      DMA_RX_FRAME_infos->Seg_Count++;
      return 1;
    }

    /* check if first segment */
    else if(((DMARxDescToGet->Status & ETH_DMARxDesc_OWN) == (uint32_t)RESET) &&
     ((DMARxDescToGet->Status & ETH_DMARxDesc_FS) != (uint32_t)RESET)&&
     ((DMARxDescToGet->Status & ETH_DMARxDesc_LS) == (uint32_t)RESET))
    {
      DMA_RX_FRAME_infos->FS_Rx_Desc = DMARxDescToGet;
      DMA_RX_FRAME_infos->LS_Rx_Desc = NULL;
      DMA_RX_FRAME_infos->Seg_Count = 1;
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);
    }

    /* check if intermediate segment */
    else if(((DMARxDescToGet->Status & ETH_DMARxDesc_OWN) == (uint32_t)RESET) &&
     ((DMARxDescToGet->Status & ETH_DMARxDesc_FS) == (uint32_t)RESET)&&
     ((DMARxDescToGet->Status & ETH_DMARxDesc_LS) == (uint32_t)RESET))
    {
      (DMA_RX_FRAME_infos->Seg_Count) ++;
      DMARxDescToGet = (ETH_DMADESCTypeDef*) (DMARxDescToGet->Buffer2NextDescAddr);
    }
    return 0;
}


/**
  * @brief  Initializes the DMA Tx descriptors in chain mode.
  * @param  DMATxDescTab: Pointer on the first Tx desc list
  * @param  TxBuff: Pointer on the first TxBuffer list
  * @param  TxBuffCount: Number of the used Tx desc in the list
  * @retval None
  */
void ETH_DMATxDescChainInit(ETH_DMADESCTypeDef *DMATxDescTab, uint8_t* TxBuff, uint32_t TxBuffCount)
{
  uint32_t i = 0;
  ETH_DMADESCTypeDef *DMATxDesc;

  /* Set the DMATxDescToSet pointer with the first one of the DMATxDescTab list */
  DMATxDescToSet = DMATxDescTab;
  /* Fill each DMATxDesc descriptor with the right values */
  for(i=0; i < TxBuffCount; i++)
  {
    /* Get the pointer on the ith member of the Tx Desc list */
    DMATxDesc = DMATxDescTab + i;
    /* Set Second Address Chained bit */
    DMATxDesc->Status = ETH_DMATxDesc_TCH;

    /* Set Buffer1 address pointer */
    DMATxDesc->Buffer1Addr = (uint32_t)(&TxBuff[i*ETH_TX_BUF_SIZE]);

    /* Initialize the next descriptor with the Next Descriptor Polling Enable */
    if(i < (TxBuffCount-1))
    {
      /* Set next descriptor address register with next descriptor base address */
      DMATxDesc->Buffer2NextDescAddr = (uint32_t)(DMATxDescTab+i+1);
    }
    else
    {
      /* For last descriptor, set next descriptor address register equal to the first descriptor base address */
      DMATxDesc->Buffer2NextDescAddr = (uint32_t) DMATxDescTab;
    }
  }

  /* Set Transmit Desciptor List Address Register */
  ETH->DMATDLAR = (uint32_t) DMATxDescTab;
}


/**
  * @brief  Checks whether the specified ETHERNET DMA Tx Desc flag is set or not.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @param  ETH_DMATxDescFlag: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMATxDesc_OWN : OWN bit: descriptor is owned by DMA engine
  *     @arg ETH_DMATxDesc_IC  : Interrupt on completion
  *     @arg ETH_DMATxDesc_LS  : Last Segment
  *     @arg ETH_DMATxDesc_FS  : First Segment
  *     @arg ETH_DMATxDesc_DC  : Disable CRC
  *     @arg ETH_DMATxDesc_DP  : Disable Pad
  *     @arg ETH_DMATxDesc_TTSE: Transmit Time Stamp Enable
  *     @arg ETH_DMATxDesc_CIC : Checksum insertion control
  *     @arg ETH_DMATxDesc_TER : Transmit End of Ring
  *     @arg ETH_DMATxDesc_TCH : Second Address Chained
  *     @arg ETH_DMATxDesc_TTSS: Tx Time Stamp Status
  *     @arg ETH_DMATxDesc_IHE : IP Header Error
  *     @arg ETH_DMATxDesc_ES  : Error summary
  *     @arg ETH_DMATxDesc_JT  : Jabber Timeout
  *     @arg ETH_DMATxDesc_FF  : Frame Flushed: DMA/MTL flushed the frame due to SW flush
  *     @arg ETH_DMATxDesc_PCE : Payload Checksum Error
  *     @arg ETH_DMATxDesc_LCA : Loss of Carrier: carrier lost during transmission
  *     @arg ETH_DMATxDesc_NC  : No Carrier: no carrier signal from the transceiver
  *     @arg ETH_DMATxDesc_LCO : Late Collision: transmission aborted due to collision
  *     @arg ETH_DMATxDesc_EC  : Excessive Collision: transmission aborted after 16 collisions
  *     @arg ETH_DMATxDesc_VF  : VLAN Frame
  *     @arg ETH_DMATxDesc_CC  : Collision Count
  *     @arg ETH_DMATxDesc_ED  : Excessive Deferral
  *     @arg ETH_DMATxDesc_UF  : Underflow Error: late data arrival from the memory
  *     @arg ETH_DMATxDesc_DB  : Deferred Bit
  * @retval The new state of ETH_DMATxDescFlag (SET or RESET).
  */
FlagStatus ETH_GetDMATxDescFlagStatus(ETH_DMADESCTypeDef *DMATxDesc, uint32_t ETH_DMATxDescFlag)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_DMATxDESC_GET_FLAG(ETH_DMATxDescFlag));

  if ((DMATxDesc->Status & ETH_DMATxDescFlag) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Returns the specified ETHERNET DMA Tx Desc collision count.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @retval The Transmit descriptor collision counter value.
  */
uint32_t ETH_GetDMATxDescCollisionCount(ETH_DMADESCTypeDef *DMATxDesc)
{
  /* Return the Receive descriptor frame length */
  return ((DMATxDesc->Status & ETH_DMATxDesc_CC) >> ETH_DMATXDESC_COLLISION_COUNTSHIFT);
}

/**
  * @brief  Set the specified DMA Tx Desc Own bit.
  * @param  DMATxDesc: Pointer on a Tx desc
  * @retval None
  */
void ETH_SetDMATxDescOwnBit(ETH_DMADESCTypeDef *DMATxDesc)
{
  /* Set the DMA Tx Desc Own bit */
  DMATxDesc->Status |= ETH_DMATxDesc_OWN;
}

/**
  * @brief  Enables or disables the specified DMA Tx Desc Transmit interrupt.
  * @param  DMATxDesc: Pointer on a Tx desc
  * @param  NewState: new state of the DMA Tx Desc transmit interrupt.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMATxDescTransmitITConfig(ETH_DMADESCTypeDef *DMATxDesc, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the DMA Tx Desc Transmit interrupt */
    DMATxDesc->Status |= ETH_DMATxDesc_IC;
  }
  else
  {
    /* Disable the DMA Tx Desc Transmit interrupt */
    DMATxDesc->Status &=(~(uint32_t)ETH_DMATxDesc_IC);
  }
}

/**
  * @brief  configure Tx descriptor as last or first segment
  * @param  DMATxDesc: Pointer on a Tx desc
  * @param  DMATxDesc_FrameSegment: specifies is the actual Tx desc contain last or first segment.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMATxDesc_LastSegment  : actual Tx desc contain last segment
  *     @arg ETH_DMATxDesc_FirstSegment : actual Tx desc contain first segment
  * @retval None
  */
void ETH_DMATxDescFrameSegmentConfig(ETH_DMADESCTypeDef *DMATxDesc, uint32_t DMATxDesc_FrameSegment)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_TXDESC_SEGMENT(DMATxDesc_FrameSegment));

  /* Selects the DMA Tx Desc Frame segment */
  DMATxDesc->Status |= DMATxDesc_FrameSegment;
}

/**
  * @brief  Selects the specified ETHERNET DMA Tx Desc Checksum Insertion.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @param  DMATxDesc_Checksum: specifies is the DMA Tx desc checksum insertion.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMATxDesc_ChecksumByPass : Checksum bypass
  *     @arg ETH_DMATxDesc_ChecksumIPV4Header : IPv4 header checksum
  *     @arg ETH_DMATxDesc_ChecksumTCPUDPICMPSegment : TCP/UDP/ICMP checksum. Pseudo header checksum is assumed to be present
  *     @arg ETH_DMATxDesc_ChecksumTCPUDPICMPFull : TCP/UDP/ICMP checksum fully in hardware including pseudo header
  * @retval None
  */
void ETH_DMATxDescChecksumInsertionConfig(ETH_DMADESCTypeDef *DMATxDesc, uint32_t DMATxDesc_Checksum)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_TXDESC_CHECKSUM(DMATxDesc_Checksum));

  /* Set the selected DMA Tx desc checksum insertion control */
  DMATxDesc->Status |= DMATxDesc_Checksum;
}

/**
  * @brief  Enables or disables the DMA Tx Desc CRC.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @param  NewState: new state of the specified DMA Tx Desc CRC.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMATxDescCRCCmd(ETH_DMADESCTypeDef *DMATxDesc, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMA Tx Desc CRC */
    DMATxDesc->Status &= (~(uint32_t)ETH_DMATxDesc_DC);
  }
  else
  {
    /* Disable the selected DMA Tx Desc CRC */
    DMATxDesc->Status |= ETH_DMATxDesc_DC;
  }
}


/**
  * @brief  Enables or disables the DMA Tx Desc second address chained.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @param  NewState: new state of the specified DMA Tx Desc second address chained.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMATxDescSecondAddressChainedCmd(ETH_DMADESCTypeDef *DMATxDesc, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMA Tx Desc second address chained */
    DMATxDesc->Status |= ETH_DMATxDesc_TCH;
  }
  else
  {
    /* Disable the selected DMA Tx Desc second address chained */
    DMATxDesc->Status &=(~(uint32_t)ETH_DMATxDesc_TCH);
  }
}

/**
  * @brief  Enables or disables the DMA Tx Desc padding for frame shorter than 64 bytes.
  * @param  DMATxDesc: pointer on a DMA Tx descriptor
  * @param  NewState: new state of the specified DMA Tx Desc padding for frame shorter than 64 bytes.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMATxDescShortFramePaddingCmd(ETH_DMADESCTypeDef *DMATxDesc, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected DMA Tx Desc padding for frame shorter than 64 bytes */
    DMATxDesc->Status &= (~(uint32_t)ETH_DMATxDesc_DP);
  }
  else
  {
    /* Disable the selected DMA Tx Desc padding for frame shorter than 64 bytes*/
    DMATxDesc->Status |= ETH_DMATxDesc_DP;
  }
}


/**
  * @brief  Configures the specified DMA Tx Desc buffer1 and buffer2 sizes.
  * @param  DMATxDesc: Pointer on a Tx desc
  * @param  BufferSize1: specifies the Tx desc buffer1 size.
  * @param  BufferSize2: specifies the Tx desc buffer2 size (put "0" if not used).
  * @retval None
  */
void ETH_DMATxDescBufferSizeConfig(ETH_DMADESCTypeDef *DMATxDesc, uint32_t BufferSize1, uint32_t BufferSize2)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMATxDESC_BUFFER_SIZE(BufferSize1));
  assert_param(IS_ETH_DMATxDESC_BUFFER_SIZE(BufferSize2));

  /* Set the DMA Tx Desc buffer1 and buffer2 sizes values */
  DMATxDesc->ControlBufferSize |= (BufferSize1 | (BufferSize2 << ETH_DMATXDESC_BUFFER2_SIZESHIFT));
}


/**
  * @brief  Checks whether the specified ETHERNET Rx Desc flag is set or not.
  * @param  DMARxDesc: pointer on a DMA Rx descriptor
  * @param  ETH_DMARxDescFlag: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMARxDesc_OWN:         OWN bit: descriptor is owned by DMA engine
  *     @arg ETH_DMARxDesc_AFM:         DA Filter Fail for the rx frame
  *     @arg ETH_DMARxDesc_ES:          Error summary
  *     @arg ETH_DMARxDesc_DE:          Descriptor error: no more descriptors for receive frame
  *     @arg ETH_DMARxDesc_SAF:         SA Filter Fail for the received frame
  *     @arg ETH_DMARxDesc_LE:          Frame size not matching with length field
  *     @arg ETH_DMARxDesc_OE:          Overflow Error: Frame was damaged due to buffer overflow
  *     @arg ETH_DMARxDesc_VLAN:        VLAN Tag: received frame is a VLAN frame
  *     @arg ETH_DMARxDesc_FS:          First descriptor of the frame
  *     @arg ETH_DMARxDesc_LS:          Last descriptor of the frame
  *     @arg ETH_DMARxDesc_IPV4HCE:     IPC Checksum Error/Giant Frame: Rx Ipv4 header checksum error
  *     @arg ETH_DMARxDesc_LC:          Late collision occurred during reception
  *     @arg ETH_DMARxDesc_FT:          Frame type - Ethernet, otherwise 802.3
  *     @arg ETH_DMARxDesc_RWT:         Receive Watchdog Timeout: watchdog timer expired during reception
  *     @arg ETH_DMARxDesc_RE:          Receive error: error reported by MII interface
  *     @arg ETH_DMARxDesc_DE:          Dribble bit error: frame contains non int multiple of 8 bits
  *     @arg ETH_DMARxDesc_CE:          CRC error
  *     @arg ETH_DMARxDesc_MAMPCE:      Rx MAC Address/Payload Checksum Error: Rx MAC address matched/ Rx Payload Checksum Error
  * @retval The new state of ETH_DMARxDescFlag (SET or RESET).
  */
FlagStatus ETH_GetDMARxDescFlagStatus(ETH_DMADESCTypeDef *DMARxDesc, uint32_t ETH_DMARxDescFlag)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_DMARxDESC_GET_FLAG(ETH_DMARxDescFlag));
  if ((DMARxDesc->Status & ETH_DMARxDescFlag) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

#ifdef USE_ENHANCED_DMA_DESCRIPTORS
/**
  * @brief  Checks whether the specified ETHERNET PTP Rx Desc extended flag is set or not.
  * @param  DMAPTPRxDesc: pointer on a DMA PTP Rx descriptor
  * @param  ETH_DMAPTPRxDescFlag: specifies the extended flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMAPTPRxDesc_PTPV:   PTP version
  *     @arg ETH_DMAPTPRxDesc_PTPFT:  PTP frame type
  *     @arg ETH_DMAPTPRxDesc_PTPMT:  PTP message type
  *     @arg ETH_DMAPTPRxDesc_IPV6PR: IPv6 packet received
  *     @arg ETH_DMAPTPRxDesc_IPV4PR: IPv4 packet received
  *     @arg ETH_DMAPTPRxDesc_IPCB:   IP checksum bypassed
  *     @arg ETH_DMAPTPRxDesc_IPPE:   IP payload error
  *     @arg ETH_DMAPTPRxDesc_IPHE:   IP header error
  *     @arg ETH_DMAPTPRxDesc_IPPT:   IP payload type
  * @retval The new state of ETH_DMAPTPRxDescExtendedFlag (SET or RESET).
  */
FlagStatus ETH_GetDMAPTPRxDescExtendedFlagStatus(ETH_DMADESCTypeDef *DMAPTPRxDesc, uint32_t ETH_DMAPTPRxDescExtendedFlag)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_ETH_DMAPTPRxDESC_GET_EXTENDED_FLAG(ETH_DMAPTPRxDescExtendedFlag));

  if ((DMAPTPRxDesc->ExtendedStatus & ETH_DMAPTPRxDescExtendedFlag) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}
#endif /* USE_ENHANCED_DMA_DESCRIPTORS */

/**
  * @brief  Set the specified DMA Rx Desc Own bit.
  * @param  DMARxDesc: Pointer on a Rx desc
  * @retval None
  */
void ETH_SetDMARxDescOwnBit(ETH_DMADESCTypeDef *DMARxDesc)
{
  /* Set the DMA Rx Desc Own bit */
  DMARxDesc->Status |= ETH_DMARxDesc_OWN;
}

/**
  * @brief  Returns the specified DMA Rx Desc frame length.
  * @param  DMARxDesc: pointer on a DMA Rx descriptor
  * @retval The Rx descriptor received frame length.
  */
uint32_t ETH_GetDMARxDescFrameLength(ETH_DMADESCTypeDef *DMARxDesc)
{
  /* Return the Receive descriptor frame length */
  return ((DMARxDesc->Status & ETH_DMARxDesc_FL) >> ETH_DMARXDESC_FRAME_LENGTHSHIFT);
}

/**
  * @brief  Enables or disables the specified DMA Rx Desc receive interrupt.
  * @param  DMARxDesc: Pointer on a Rx desc
  * @param  NewState: new state of the specified DMA Rx Desc interrupt.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMARxDescReceiveITConfig(ETH_DMADESCTypeDef *DMARxDesc, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the DMA Rx Desc receive interrupt */
    DMARxDesc->ControlBufferSize &=(~(uint32_t)ETH_DMARxDesc_DIC);
  }
  else
  {
    /* Disable the DMA Rx Desc receive interrupt */
    DMARxDesc->ControlBufferSize |= ETH_DMARxDesc_DIC;
  }
}


/**
  * @brief  Returns the specified ETHERNET DMA Rx Desc buffer size.
  * @param  DMARxDesc: pointer on a DMA Rx descriptor
  * @param  DMARxDesc_Buffer: specifies the DMA Rx Desc buffer.
  *   This parameter can be any one of the following values:
  *     @arg ETH_DMARxDesc_Buffer1 : DMA Rx Desc Buffer1
  *     @arg ETH_DMARxDesc_Buffer2 : DMA Rx Desc Buffer2
  * @retval The Receive descriptor frame length.
  */
uint32_t ETH_GetDMARxDescBufferSize(ETH_DMADESCTypeDef *DMARxDesc, uint32_t DMARxDesc_Buffer)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_RXDESC_BUFFER(DMARxDesc_Buffer));

  if(DMARxDesc_Buffer != ETH_DMARxDesc_Buffer1)
  {
    /* Return the DMA Rx Desc buffer2 size */
    return ((DMARxDesc->ControlBufferSize & ETH_DMARxDesc_RBS2) >> ETH_DMARXDESC_BUFFER2_SIZESHIFT);
  }
  else
  {
    /* Return the DMA Rx Desc buffer1 size */
    return (DMARxDesc->ControlBufferSize & ETH_DMARxDesc_RBS1);
  }
}


/**
  * @brief  Get the size of the received packet.
  * @param  None
  * @retval framelength: received packet size
  */
uint32_t ETH_GetRxPktSize(ETH_DMADESCTypeDef *DMARxDesc)
{
  uint32_t frameLength = 0;
  if(((DMARxDesc->Status & ETH_DMARxDesc_OWN) == (uint32_t)RESET) &&
     ((DMARxDesc->Status & ETH_DMARxDesc_ES) == (uint32_t)RESET) &&
     ((DMARxDesc->Status & ETH_DMARxDesc_LS) != (uint32_t)RESET))
  {
    /* Get the size of the packet: including 4 bytes of the CRC */
    frameLength =  ETH_GetDMARxDescFrameLength(DMARxDesc);
  }

  /* Return Frame Length */
  return frameLength;
}

#ifdef USE_ENHANCED_DMA_DESCRIPTORS
/**
  * @brief  Enables or disables the Enhanced descriptor structure.
  * @param  NewState: new state of the Enhanced descriptor structure.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_EnhancedDescriptorCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable enhanced descriptor structure */
    ETH->DMABMR |= ETH_DMABMR_EDE;
  }
  else
  {
    /* Disable enhanced descriptor structure */
    ETH->DMABMR &= ~ETH_DMABMR_EDE;
  }
}
#endif /* USE_ENHANCED_DMA_DESCRIPTORS */

/******************************************************************************/
/*                           DMA functions                                    */
/******************************************************************************/
/**
  * @brief  Resets all MAC subsystem internal registers and logic.
  * @param  None
  * @retval None
  */
void ETH_SoftwareReset(void)
{
  /* Set the SWR bit: resets all MAC subsystem internal registers and logic */
  /* After reset all the registers holds their respective reset values */
  ETH->DMABMR |= ETH_DMABMR_SR;
}

/**
  * @brief  Checks whether the ETHERNET software reset bit is set or not.
  * @param  None
  * @retval The new state of DMA Bus Mode register SR bit (SET or RESET).
  */
FlagStatus ETH_GetSoftwareResetStatus(void)
{
  FlagStatus bitstatus = RESET;
  if((ETH->DMABMR & ETH_DMABMR_SR) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Checks whether the specified ETHERNET DMA flag is set or not.
  * @param  ETH_DMA_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMA_FLAG_TST : Time-stamp trigger flag
  *     @arg ETH_DMA_FLAG_PMT : PMT flag
  *     @arg ETH_DMA_FLAG_MMC : MMC flag
  *     @arg ETH_DMA_FLAG_DataTransferError : Error bits 0-data buffer, 1-desc. access
  *     @arg ETH_DMA_FLAG_ReadWriteError    : Error bits 0-write trnsf, 1-read transfr
  *     @arg ETH_DMA_FLAG_AccessError       : Error bits 0-Rx DMA, 1-Tx DMA
  *     @arg ETH_DMA_FLAG_NIS : Normal interrupt summary flag
  *     @arg ETH_DMA_FLAG_AIS : Abnormal interrupt summary flag
  *     @arg ETH_DMA_FLAG_ER  : Early receive flag
  *     @arg ETH_DMA_FLAG_FBE : Fatal bus error flag
  *     @arg ETH_DMA_FLAG_ET  : Early transmit flag
  *     @arg ETH_DMA_FLAG_RWT : Receive watchdog timeout flag
  *     @arg ETH_DMA_FLAG_RPS : Receive process stopped flag
  *     @arg ETH_DMA_FLAG_RBU : Receive buffer unavailable flag
  *     @arg ETH_DMA_FLAG_R   : Receive flag
  *     @arg ETH_DMA_FLAG_TU  : Underflow flag
  *     @arg ETH_DMA_FLAG_RO  : Overflow flag
  *     @arg ETH_DMA_FLAG_TJT : Transmit jabber timeout flag
  *     @arg ETH_DMA_FLAG_TBU : Transmit buffer unavailable flag
  *     @arg ETH_DMA_FLAG_TPS : Transmit process stopped flag
  *     @arg ETH_DMA_FLAG_T   : Transmit flag
  * @retval The new state of ETH_DMA_FLAG (SET or RESET).
  */
FlagStatus ETH_GetDMAFlagStatus(uint32_t ETH_DMA_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_DMA_GET_IT(ETH_DMA_FLAG));
  if ((ETH->DMASR & ETH_DMA_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Clears the ETHERNETs DMA pending flag.
  * @param  ETH_DMA_FLAG: specifies the flag to clear.
  *   This parameter can be any combination of the following values:
  *     @arg ETH_DMA_FLAG_NIS : Normal interrupt summary flag
  *     @arg ETH_DMA_FLAG_AIS : Abnormal interrupt summary flag
  *     @arg ETH_DMA_FLAG_ER  : Early receive flag
  *     @arg ETH_DMA_FLAG_FBE : Fatal bus error flag
  *     @arg ETH_DMA_FLAG_ETI : Early transmit flag
  *     @arg ETH_DMA_FLAG_RWT : Receive watchdog timeout flag
  *     @arg ETH_DMA_FLAG_RPS : Receive process stopped flag
  *     @arg ETH_DMA_FLAG_RBU : Receive buffer unavailable flag
  *     @arg ETH_DMA_FLAG_R   : Receive flag
  *     @arg ETH_DMA_FLAG_TU  : Transmit Underflow flag
  *     @arg ETH_DMA_FLAG_RO  : Receive Overflow flag
  *     @arg ETH_DMA_FLAG_TJT : Transmit jabber timeout flag
  *     @arg ETH_DMA_FLAG_TBU : Transmit buffer unavailable flag
  *     @arg ETH_DMA_FLAG_TPS : Transmit process stopped flag
  *     @arg ETH_DMA_FLAG_T   : Transmit flag
  * @retval None
  */
void ETH_DMAClearFlag(uint32_t ETH_DMA_FLAG)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_FLAG(ETH_DMA_FLAG));

  /* Clear the selected ETHERNET DMA FLAG */
  ETH->DMASR = (uint32_t) ETH_DMA_FLAG;
}

/**
  * @brief  Enables or disables the specified ETHERNET DMA interrupts.
  * @param  ETH_DMA_IT: specifies the ETHERNET DMA interrupt sources to be
  *   enabled or disabled.
  *   This parameter can be any combination of the following values:
  *     @arg ETH_DMA_IT_NIS : Normal interrupt summary
  *     @arg ETH_DMA_IT_AIS : Abnormal interrupt summary
  *     @arg ETH_DMA_IT_ER  : Early receive interrupt
  *     @arg ETH_DMA_IT_FBE : Fatal bus error interrupt
  *     @arg ETH_DMA_IT_ET  : Early transmit interrupt
  *     @arg ETH_DMA_IT_RWT : Receive watchdog timeout interrupt
  *     @arg ETH_DMA_IT_RPS : Receive process stopped interrupt
  *     @arg ETH_DMA_IT_RBU : Receive buffer unavailable interrupt
  *     @arg ETH_DMA_IT_R   : Receive interrupt
  *     @arg ETH_DMA_IT_TU  : Underflow interrupt
  *     @arg ETH_DMA_IT_RO  : Overflow interrupt
  *     @arg ETH_DMA_IT_TJT : Transmit jabber timeout interrupt
  *     @arg ETH_DMA_IT_TBU : Transmit buffer unavailable interrupt
  *     @arg ETH_DMA_IT_TPS : Transmit process stopped interrupt
  *     @arg ETH_DMA_IT_T   : Transmit interrupt
  * @param  NewState: new state of the specified ETHERNET DMA interrupts.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMAITConfig(uint32_t ETH_DMA_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_IT(ETH_DMA_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected ETHERNET DMA interrupts */
    ETH->DMAIER |= ETH_DMA_IT;
  }
  else
  {
    /* Disable the selected ETHERNET DMA interrupts */
    ETH->DMAIER &=(~(uint32_t)ETH_DMA_IT);
  }
}

/**
  * @brief  Checks whether the specified ETHERNET DMA interrupt has occurred or not.
  * @param  ETH_DMA_IT: specifies the interrupt source to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMA_IT_TST : Time-stamp trigger interrupt
  *     @arg ETH_DMA_IT_PMT : PMT interrupt
  *     @arg ETH_DMA_IT_MMC : MMC interrupt
  *     @arg ETH_DMA_IT_NIS : Normal interrupt summary
  *     @arg ETH_DMA_IT_AIS : Abnormal interrupt summary
  *     @arg ETH_DMA_IT_ER  : Early receive interrupt
  *     @arg ETH_DMA_IT_FBE : Fatal bus error interrupt
  *     @arg ETH_DMA_IT_ET  : Early transmit interrupt
  *     @arg ETH_DMA_IT_RWT : Receive watchdog timeout interrupt
  *     @arg ETH_DMA_IT_RPS : Receive process stopped interrupt
  *     @arg ETH_DMA_IT_RBU : Receive buffer unavailable interrupt
  *     @arg ETH_DMA_IT_R   : Receive interrupt
  *     @arg ETH_DMA_IT_TU  : Underflow interrupt
  *     @arg ETH_DMA_IT_RO  : Overflow interrupt
  *     @arg ETH_DMA_IT_TJT : Transmit jabber timeout interrupt
  *     @arg ETH_DMA_IT_TBU : Transmit buffer unavailable interrupt
  *     @arg ETH_DMA_IT_TPS : Transmit process stopped interrupt
  *     @arg ETH_DMA_IT_T   : Transmit interrupt
  * @retval The new state of ETH_DMA_IT (SET or RESET).
  */
ITStatus ETH_GetDMAITStatus(uint32_t ETH_DMA_IT)
{
  ITStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_DMA_GET_IT(ETH_DMA_IT));
  if ((ETH->DMASR & ETH_DMA_IT) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Clears the ETHERNETs DMA IT pending bit.
  * @param  ETH_DMA_IT: specifies the interrupt pending bit to clear.
  *   This parameter can be any combination of the following values:
  *     @arg ETH_DMA_IT_NIS : Normal interrupt summary
  *     @arg ETH_DMA_IT_AIS : Abnormal interrupt summary
  *     @arg ETH_DMA_IT_ER  : Early receive interrupt
  *     @arg ETH_DMA_IT_FBE : Fatal bus error interrupt
  *     @arg ETH_DMA_IT_ETI : Early transmit interrupt
  *     @arg ETH_DMA_IT_RWT : Receive watchdog timeout interrupt
  *     @arg ETH_DMA_IT_RPS : Receive process stopped interrupt
  *     @arg ETH_DMA_IT_RBU : Receive buffer unavailable interrupt
  *     @arg ETH_DMA_IT_R   : Receive interrupt
  *     @arg ETH_DMA_IT_TU  : Transmit Underflow interrupt
  *     @arg ETH_DMA_IT_RO  : Receive Overflow interrupt
  *     @arg ETH_DMA_IT_TJT : Transmit jabber timeout interrupt
  *     @arg ETH_DMA_IT_TBU : Transmit buffer unavailable interrupt
  *     @arg ETH_DMA_IT_TPS : Transmit process stopped interrupt
  *     @arg ETH_DMA_IT_T   : Transmit interrupt
  * @retval None
  */
void ETH_DMAClearITPendingBit(uint32_t ETH_DMA_IT)
{
  /* Check the parameters */
  assert_param(IS_ETH_DMA_IT(ETH_DMA_IT));

  /* Clear the selected ETHERNET DMA IT */
  ETH->DMASR = (uint32_t) ETH_DMA_IT;
}

/**
  * @brief  Returns the ETHERNET DMA Transmit Process State.
  * @param  None
  * @retval The new ETHERNET DMA Transmit Process State:
  *   This can be one of the following values:
  *     - ETH_DMA_TransmitProcess_Stopped   : Stopped - Reset or Stop Tx Command issued
  *     - ETH_DMA_TransmitProcess_Fetching  : Running - fetching the Tx descriptor
  *     - ETH_DMA_TransmitProcess_Waiting   : Running - waiting for status
  *     - ETH_DMA_TransmitProcess_Reading   : Running - reading the data from host memory
  *     - ETH_DMA_TransmitProcess_Suspended : Suspended - Tx Descriptor unavailable
  *     - ETH_DMA_TransmitProcess_Closing   : Running - closing Rx descriptor
  */
uint32_t ETH_GetTransmitProcessState(void)
{
  return ((uint32_t)(ETH->DMASR & ETH_DMASR_TS));
}

/**
  * @brief  Returns the ETHERNET DMA Receive Process State.
  * @param  None
  * @retval The new ETHERNET DMA Receive Process State:
  *   This can be one of the following values:
  *     - ETH_DMA_ReceiveProcess_Stopped   : Stopped - Reset or Stop Rx Command issued
  *     - ETH_DMA_ReceiveProcess_Fetching  : Running - fetching the Rx descriptor
  *     - ETH_DMA_ReceiveProcess_Waiting   : Running - waiting for packet
  *     - ETH_DMA_ReceiveProcess_Suspended : Suspended - Rx Descriptor unavailable
  *     - ETH_DMA_ReceiveProcess_Closing   : Running - closing descriptor
  *     - ETH_DMA_ReceiveProcess_Queuing   : Running - queuing the receive frame into host memory
  */
uint32_t ETH_GetReceiveProcessState(void)
{
  return ((uint32_t)(ETH->DMASR & ETH_DMASR_RS));
}

/**
  * @brief  Clears the ETHERNET transmit FIFO.
  * @param  None
  * @retval None
  */
void ETH_FlushTransmitFIFO(void)
{
  /* Set the Flush Transmit FIFO bit */
  ETH->DMAOMR |= ETH_DMAOMR_FTF;
}

/**
  * @brief  Checks whether the ETHERNET flush transmit FIFO bit is cleared or not.
  * @param  None
  * @retval The new state of ETHERNET flush transmit FIFO bit (SET or RESET).
  */
FlagStatus ETH_GetFlushTransmitFIFOStatus(void)
{
  FlagStatus bitstatus = RESET;
  if ((ETH->DMAOMR & ETH_DMAOMR_FTF) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Enables or disables the DMA transmission.
  * @param  NewState: new state of the DMA transmission.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMATransmissionCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the DMA transmission */
    ETH->DMAOMR |= ETH_DMAOMR_ST;
  }
  else
  {
    /* Disable the DMA transmission */
    ETH->DMAOMR &= ~ETH_DMAOMR_ST;
  }
}

/**
  * @brief  Enables or disables the DMA reception.
  * @param  NewState: new state of the DMA reception.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_DMAReceptionCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the DMA reception */
    ETH->DMAOMR |= ETH_DMAOMR_SR;
  }
  else
  {
    /* Disable the DMA reception */
    ETH->DMAOMR &= ~ETH_DMAOMR_SR;
  }
}

/**
  * @brief  Checks whether the specified ETHERNET DMA overflow flag is set or not.
  * @param  ETH_DMA_Overflow: specifies the DMA overflow flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_DMA_Overflow_RxFIFOCounter : Overflow for FIFO Overflows Counter
  *     @arg ETH_DMA_Overflow_MissedFrameCounter : Overflow for Buffer Unavailable Missed Frame Counter
  * @retval The new state of ETHERNET DMA overflow Flag (SET or RESET).
  */
FlagStatus ETH_GetDMAOverflowStatus(uint32_t ETH_DMA_Overflow)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_DMA_GET_OVERFLOW(ETH_DMA_Overflow));

  if ((ETH->DMAMFBOCR & ETH_DMA_Overflow) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Get the ETHERNET DMA Rx Overflow Missed Frame Counter value.
  * @param  None
  * @retval The value of Rx overflow Missed Frame Counter.
  */
uint32_t ETH_GetRxOverflowMissedFrameCounter(void)
{
  return ((uint32_t)((ETH->DMAMFBOCR & ETH_DMAMFBOCR_MFA)>>ETH_DMA_RX_OVERFLOW_MISSEDFRAMES_COUNTERSHIFT));
}

/**
  * @brief  Get the ETHERNET DMA Buffer Unavailable Missed Frame Counter value.
  * @param  None
  * @retval The value of Buffer unavailable Missed Frame Counter.
  */
uint32_t ETH_GetBufferUnavailableMissedFrameCounter(void)
{
  return ((uint32_t)(ETH->DMAMFBOCR) & ETH_DMAMFBOCR_MFC);
}

/**
  * @brief  Get the ETHERNET DMA DMACHTDR register value.
  * @param  None
  * @retval The value of the current Tx desc start address.
  */
uint32_t ETH_GetCurrentTxDescStartAddress(void)
{
  return ((uint32_t)(ETH->DMACHTDR));
}

/**
  * @brief  Get the ETHERNET DMA DMACHRDR register value.
  * @param  None
  * @retval The value of the current Rx desc start address.
  */
uint32_t ETH_GetCurrentRxDescStartAddress(void)
{
  return ((uint32_t)(ETH->DMACHRDR));
}

/**
  * @brief  Get the ETHERNET DMA DMACHTBAR register value.
  * @param  None
  * @retval The value of the current transmit descriptor data buffer address.
  */
uint32_t ETH_GetCurrentTxBufferAddress(void)
{
  return ((uint32_t)(ETH->DMACHTBAR));
}

/**
  * @brief  Get the ETHERNET DMA DMACHRBAR register value.
  * @param  None
  * @retval The value of the current receive descriptor data buffer address.
  */
uint32_t ETH_GetCurrentRxBufferAddress(void)
{
  return ((uint32_t)(ETH->DMACHRBAR));
}

/**
  * @brief  Resumes the DMA Transmission by writing to the DmaTxPollDemand register
  *   (the data written could be anything). This forces  the DMA to resume transmission.
  * @param  None
  * @retval None.
  */
void ETH_ResumeDMATransmission(void)
{
  ETH->DMATPDR = 0;
}

/**
  * @brief  Resumes the DMA Transmission by writing to the DmaRxPollDemand register
  *   (the data written could be anything). This forces the DMA to resume reception.
  * @param  None
  * @retval None.
  */
void ETH_ResumeDMAReception(void)
{
  ETH->DMARPDR = 0;
}

/**
  * @brief  Set the DMA Receive status watchdog timer register value
  * @param  Value: DMA Receive status watchdog timer register value
  * @retval None
  */
void ETH_SetReceiveWatchdogTimer(uint8_t Value)
{
  /* Set the DMA Receive status watchdog timer register */
  ETH->DMARSWTR = Value;
}

/******************************************************************************/
/*                                PHY functions                               */
/******************************************************************************/

/**
  * @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: Transceiver Basic Control Register
  *     @arg PHY_BSR: Transceiver Basic Status Register
  *     @arg PHY_SR : Transceiver 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    : Transceiver 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.
  * @Note: Don't be confused with ETH_MACLoopBackCmd function which enables internal
  *  loopback at MII level
  * @param  PHYAddress: PHY device address, is the index of one of supported 32 PHY devices.
  * @param  NewState: new state of the PHY loopBack mode.
  *   This parameter can be: ENABLE or DISABLE.
  * @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;
  }
}

/******************************************************************************/
/*                           Power Management(PMT) functions                  */
/******************************************************************************/
/**
  * @brief  Reset Wakeup frame filter register pointer.
  * @param  None
  * @retval None
  */
void ETH_ResetWakeUpFrameFilterRegisterPointer(void)
{
  /* Resets the Remote Wake-up Frame Filter register pointer to 0x0000 */
  ETH->MACPMTCSR |= ETH_MACPMTCSR_WFFRPR;
}

/**
  * @brief  Populates the remote wakeup frame registers.
  * @param  Buffer: Pointer on remote WakeUp Frame Filter Register buffer data (8 words).
  * @retval None
  */
void ETH_SetWakeUpFrameFilterRegister(uint32_t *Buffer)
{
  uint32_t i = 0;

  /* Fill Remote Wake-up Frame Filter register with Buffer data */
  for(i =0; i<ETH_WAKEUP_REGISTER_LENGTH; i++)
  {
    /* Write each time to the same register */
    ETH->MACRWUFFR = Buffer[i];
  }
}

/**
  * @brief  Enables or disables any unicast packet filtered by the MAC address
  *   recognition to be a wake-up frame.
  * @param  NewState: new state of the MAC Global Unicast Wake-Up.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_GlobalUnicastWakeUpCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MAC Global Unicast Wake-Up */
    ETH->MACPMTCSR |= ETH_MACPMTCSR_GU;
  }
  else
  {
    /* Disable the MAC Global Unicast Wake-Up */
    ETH->MACPMTCSR &= ~ETH_MACPMTCSR_GU;
  }
}

/**
  * @brief  Checks whether the specified ETHERNET PMT flag is set or not.
  * @param  ETH_PMT_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg ETH_PMT_FLAG_WUFFRPR : Wake-Up Frame Filter Register Pointer Reset
  *     @arg ETH_PMT_FLAG_WUFR    : Wake-Up Frame Received
  *     @arg ETH_PMT_FLAG_MPR     : Magic Packet Received
  * @retval The new state of ETHERNET PMT Flag (SET or RESET).
  */
FlagStatus ETH_GetPMTFlagStatus(uint32_t ETH_PMT_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_PMT_GET_FLAG(ETH_PMT_FLAG));

  if ((ETH->MACPMTCSR & ETH_PMT_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Enables or disables the MAC Wake-Up Frame Detection.
  * @param  NewState: new state of the MAC Wake-Up Frame Detection.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_WakeUpFrameDetectionCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MAC Wake-Up Frame Detection */
    ETH->MACPMTCSR |= ETH_MACPMTCSR_WFE;
  }
  else
  {
    /* Disable the MAC Wake-Up Frame Detection */
    ETH->MACPMTCSR &= ~ETH_MACPMTCSR_WFE;
  }
}

/**
  * @brief  Enables or disables the MAC Magic Packet Detection.
  * @param  NewState: new state of the MAC Magic Packet Detection.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MagicPacketDetectionCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MAC Magic Packet Detection */
    ETH->MACPMTCSR |= ETH_MACPMTCSR_MPE;
  }
  else
  {
    /* Disable the MAC Magic Packet Detection */
    ETH->MACPMTCSR &= ~ETH_MACPMTCSR_MPE;
  }
}

/**
  * @brief  Enables or disables the MAC Power Down.
  * @param  NewState: new state of the MAC Power Down.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_PowerDownCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MAC Power Down */
    /* This puts the MAC in power down mode */
    ETH->MACPMTCSR |= ETH_MACPMTCSR_PD;
  }
  else
  {
    /* Disable the MAC Power Down */
    ETH->MACPMTCSR &= ~ETH_MACPMTCSR_PD;
  }
}

/******************************************************************************/
/*                              MMC functions                                 */
/******************************************************************************/
/**
  * @brief  Preset and Initialize the MMC counters to almost-full value: 0xFFFF_FFF0 (full - 16)
  * @param  None
  * @retval None
  */
void ETH_MMCCounterFullPreset(void)
{
  /* Preset and Initialize the MMC counters to almost-full value */
  ETH->MMCCR |= ETH_MMCCR_MCFHP | ETH_MMCCR_MCP;
}

/**
  * @brief  Preset and Initialize the MMC counters to almost-hal value: 0x7FFF_FFF0 (half - 16).
  * @param  None
  * @retval None
  */
void ETH_MMCCounterHalfPreset(void)
{
  /* Preset the MMC counters to almost-full value */
  ETH->MMCCR &= ~ETH_MMCCR_MCFHP;
  /* Initialize the MMC counters to almost-half value */
  ETH->MMCCR |= ETH_MMCCR_MCP;
}

 /**
  * @brief  Enables or disables the MMC Counter Freeze.
  * @param  NewState: new state of the MMC Counter Freeze.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MMCCounterFreezeCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MMC Counter Freeze */
    ETH->MMCCR |= ETH_MMCCR_MCF;
  }
  else
  {
    /* Disable the MMC Counter Freeze */
    ETH->MMCCR &= ~ETH_MMCCR_MCF;
  }
}

/**
  * @brief  Enables or disables the MMC Reset On Read.
  * @param  NewState: new state of the MMC Reset On Read.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MMCResetOnReadCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the MMC Counter reset on read */
    ETH->MMCCR |= ETH_MMCCR_ROR;
  }
  else
  {
    /* Disable the MMC Counter reset on read */
    ETH->MMCCR &= ~ETH_MMCCR_ROR;
  }
}

/**
  * @brief  Enables or disables the MMC Counter Stop Rollover.
  * @param  NewState: new state of the MMC Counter Stop Rollover.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MMCCounterRolloverCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Disable the MMC Counter Stop Rollover  */
    ETH->MMCCR &= ~ETH_MMCCR_CSR;
  }
  else
  {
    /* Enable the MMC Counter Stop Rollover */
    ETH->MMCCR |= ETH_MMCCR_CSR;
  }
}

/**
  * @brief  Resets the MMC Counters.
  * @param  None
  * @retval None
  */
void ETH_MMCCountersReset(void)
{
  /* Resets the MMC Counters */
  ETH->MMCCR |= ETH_MMCCR_CR;
}

/**
  * @brief  Enables or disables the specified ETHERNET MMC interrupts.
  * @param  ETH_MMC_IT: specifies the ETHERNET MMC interrupt sources to be enabled or disabled.
  *   This parameter can be any combination of Tx interrupt or
  *   any combination of Rx interrupt (but not both)of the following values:
  *     @arg ETH_MMC_IT_TGF   : When Tx good frame counter reaches half the maximum value
  *     @arg ETH_MMC_IT_TGFMSC: When Tx good multi col counter reaches half the maximum value
  *     @arg ETH_MMC_IT_TGFSC : When Tx good single col counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RGUF  : When Rx good unicast frames counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RFAE  : When Rx alignment error counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RFCE  : When Rx crc error counter reaches half the maximum value
  * @param  NewState: new state of the specified ETHERNET MMC interrupts.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void ETH_MMCITConfig(uint32_t ETH_MMC_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_ETH_MMC_IT(ETH_MMC_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if ((ETH_MMC_IT & (uint32_t)0x10000000) != (uint32_t)RESET)
  {
    /* Remove Register mak from IT */
    ETH_MMC_IT &= 0xEFFFFFFF;

    /* ETHERNET MMC Rx interrupts selected */
    if (NewState != DISABLE)
    {
      /* Enable the selected ETHERNET MMC interrupts */
      ETH->MMCRIMR &=(~(uint32_t)ETH_MMC_IT);
    }
    else
    {
      /* Disable the selected ETHERNET MMC interrupts */
      ETH->MMCRIMR |= ETH_MMC_IT;
    }
  }
  else
  {
    /* ETHERNET MMC Tx interrupts selected */
    if (NewState != DISABLE)
    {
      /* Enable the selected ETHERNET MMC interrupts */
      ETH->MMCTIMR &=(~(uint32_t)ETH_MMC_IT);
    }
    else
    {
      /* Disable the selected ETHERNET MMC interrupts */
      ETH->MMCTIMR |= ETH_MMC_IT;
    }
  }
}

/**
  * @brief  Checks whether the specified ETHERNET MMC IT is set or not.
  * @param  ETH_MMC_IT: specifies the ETHERNET MMC interrupt.
  *   This parameter can be one of the following values:
  *     @arg ETH_MMC_IT_TxFCGC: When Tx good frame counter reaches half the maximum value
  *     @arg ETH_MMC_IT_TxMCGC: When Tx good multi col counter reaches half the maximum value
  *     @arg ETH_MMC_IT_TxSCGC: When Tx good single col counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RxUGFC: When Rx good unicast frames counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RxAEC : When Rx alignment error counter reaches half the maximum value
  *     @arg ETH_MMC_IT_RxCEC : When Rx crc error counter reaches half the maximum value
  * @retval The value of ETHERNET MMC IT (SET or RESET).
  */
ITStatus ETH_GetMMCITStatus(uint32_t ETH_MMC_IT)
{
  ITStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_ETH_MMC_GET_IT(ETH_MMC_IT));

  if ((ETH_MMC_IT & (uint32_t)0x10000000) != (uint32_t)RESET)
  {
    /* ETHERNET MMC Rx interrupts selected */
    /* Check if the ETHERNET MMC Rx selected interrupt is enabled and occurred */
    if ((((ETH->MMCRIR & ETH_MMC_IT) != (uint32_t)RESET)) && ((ETH->MMCRIMR & ETH_MMC_IT) == (uint32_t)RESET))
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
  }
  else
  {
    /* ETHERNET MMC Tx interrupts selected */
    /* Check if the ETHERNET MMC Tx selected interrupt is enabled and occurred */
    if ((((ETH->MMCTIR & ETH_MMC_IT) != (uint32_t)RESET)) && ((ETH->MMCRIMR & ETH_MMC_IT) == (uint32_t)RESET))
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
  }

  return bitstatus;
}

/**
  * @brief  Get the specified ETHERNET MMC register value.
  * @param  ETH_MMCReg: specifies the ETHERNET MMC register.
  *   This parameter can be one of the following values:
  *     @arg ETH_MMCCR      : MMC CR register
  *     @arg ETH_MMCRIR     : MMC RIR register
  *     @arg ETH_MMCTIR     : MMC TIR register
  *     @arg ETH_MMCRIMR    : MMC RIMR register
  *     @arg ETH_MMCTIMR    : MMC TIMR register
  *     @arg ETH_MMCTGFSCCR : MMC TGFSCCR register
  *     @arg ETH_MMCTGFMSCCR: MMC TGFMSCCR register
  *     @arg ETH_MMCTGFCR   : MMC TGFCR register
  *     @arg ETH_MMCRFCECR  : MMC RFCECR register
  *     @arg ETH_MMCRFAECR  : MMC RFAECR register
  *     @arg ETH_MMCRGUFCR  : MMC RGUFCRregister
  * @retval The value of ETHERNET MMC Register value.
  */
uint32_t ETH_GetMMCRegister(uint32_t ETH_MMCReg)
{
  /* Check the parameters */
  assert_param(IS_ETH_MMC_REGISTER(ETH_MMCReg));

  /* Return the selected register value */
  return (*(__IO uint32_t *)(ETH_MAC_BASE + ETH_MMCReg));
}


/**
  * @}
  */

/**
  * @}
  */