ethcat开发记录 二

SOEM移植到stm32f407+LAN8720硬件上的注意点

1、LAN8720的PHY地址问题。

2、LAN8720芯片在上电后要对复位引脚操作。

3、使能LAN8720的混杂模式，在新的HAL库里，这个设置包含在 ETH_MACFilterConfigTypeDef 结构体里，通过 HAL_ETH_SetMACFilterConfig函数配置。

完整代码：

/* ETH init function */
void MX_ETH_Init(void)
{

  /* USER CODE BEGIN ETH_Init 0 */
    //复位芯片
    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_2,GPIO_PIN_RESET);
    HAL_Delay(10);
    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_2,GPIO_PIN_SET);
  /* USER CODE END ETH_Init 0 */

   static uint8_t MACAddr[6];

  /* USER CODE BEGIN ETH_Init 1 */

  /* USER CODE END ETH_Init 1 */
  heth.Instance = ETH;
  MACAddr[0] = 0x00;
  MACAddr[1] = 0x80;
  MACAddr[2] = 0xE1;
  MACAddr[3] = 0x00;
  MACAddr[4] = 0x00;
  MACAddr[5] = 0x00;
  heth.Init.MACAddr = &MACAddr[0];
  heth.Init.MediaInterface = HAL_ETH_RMII_MODE;
  heth.Init.TxDesc = DMATxDscrTab;
  heth.Init.RxDesc = DMARxDscrTab;
  heth.Init.RxBuffLen = 1524;

  /* USER CODE BEGIN MACADDRESS */

  /* USER CODE END MACADDRESS */

  if (HAL_ETH_Init(&heth) != HAL_OK)
  {
    Error_Handler();
  }

  memset(&TxConfig, 0 , sizeof(ETH_TxPacketConfig));
  TxConfig.Attributes = ETH_TX_PACKETS_FEATURES_CSUM | ETH_TX_PACKETS_FEATURES_CRCPAD;
  TxConfig.ChecksumCtrl = ETH_CHECKSUM_IPHDR_PAYLOAD_INSERT_PHDR_CALC;
  TxConfig.CRCPadCtrl = ETH_CRC_PAD_INSERT;
  /* USER CODE BEGIN ETH_Init 2 */
      ETH_MACFilterConfigTypeDef pFilterConfig;
    HAL_ETH_GetMACFilterConfig(&heth, &pFilterConfig);
    pFilterConfig.PromiscuousMode=ENABLE;//使能混杂模式
    HAL_ETH_SetMACFilterConfig(&heth, &pFilterConfig);

    HAL_ETH_SetMDIOClockRange(&heth);

    //判断lan8720芯片是否连接
    uint32_t regvalue;
         if(HAL_ETH_ReadPHYRegister(&heth, PHY_ADDR, PHY_SPECIAL_MODES_REG, &regvalue) != HAL_OK)
         {
             /* Can't read from this device address continue with next address */
             return;
         }

//         if((regvalue & PHY_BASIC_STATUS_REG) == PHY_ADDR)
//         {
//             LOG_D("Found a phy, address:0x%02X", PHY_ADDR);
//         }
    //软复位
     if(HAL_ETH_WritePHYRegister(&heth, PHY_ADDR, PHY_BCR, PHY_RESET) == HAL_OK)
     {
         HAL_ETH_ReadPHYRegister(&heth, PHY_ADDR, PHY_SPECIAL_MODES_REG, &regvalue);

         uint32_t tickstart = HAL_GetTick();

         /* wait until software reset is done or timeout occured  */
         while(regvalue & PHY_RESET)
         {
           if((HAL_GetTick() - tickstart) <= 500)
           {
             if(HAL_ETH_ReadPHYRegister(&heth, PHY_ADDR, PHY_BCR, &regvalue) != HAL_OK)
             {
               return;
             }
           }
         }
     }

        //读lan8720工作模式，设置mac模块
     if(HAL_ETH_ReadPHYRegister(&heth, PHY_ADDR, PHY_BCR, &regvalue) == HAL_OK)
     {
         regvalue |= PHY_FULLDUPLEX_100M;
         HAL_ETH_WritePHYRegister(&heth, PHY_ADDR, PHY_BCR, regvalue);

         //eth_device_linkchange(&stm32_eth_device.parent, RT_TRUE);
               ETH_MACConfigTypeDef macconfig;
         HAL_ETH_GetMACConfig(&heth, &macconfig);
         macconfig.DuplexMode = ETH_FULLDUPLEX_MODE;
         macconfig.Speed = ETH_SPEED_100M;
         HAL_ETH_SetMACConfig(&heth, &macconfig);

     }
//     else
//     {
//         status = RT_ERROR;
//     }

    //以太网模块开始工作
    HAL_ETH_Start(&heth);

  /* USER CODE END ETH_Init 2 */

}

4、底层数据读写函数

//读写以太网数据的函数，被soem的nicdrv.c中的函数调用
int EthWrPacket(uint8_t* pBuff, int Len)
{
    uint32_t curidx=heth.TxDescList.CurTxDesc;
    HAL_StatusTypeDef HalStatus;
    TxBuffer.buffer=pBuff;
    TxBuffer.len=Len;
    TxConfig.TxBuffer=&TxBuffer;
    TxConfig.Length=Len;
    HalStatus = HAL_ETH_Transmit(&heth,&TxConfig,100);
    if (HalStatus == HAL_OK)  return Len;   // return the number of bytes readelse return -1;       // no packet received
} 

int EthRdPacket(void* pBuff)
{
    HAL_StatusTypeDef HalStatus;
    HalStatus=HAL_ETH_ReadData(&heth,&pBuff);
    if (HalStatus == HAL_OK) return 1;else return -1;
}   

测试方法：调用 EthWrPacket 函数，发送任意数据，连接开发板与电脑，使用wireshark监视网络，可以收到开发板的数据。

LAN8720