为什么lwip demo程序lwip_comm_init（）过不了？

一步一步的硬件调试，看看是卡到哪里了？

/**
  * @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);
}

PHYAddress 传入参数从0x00 改为0x01 后，初始化成功。
有朋友能解答一下吗？
谢谢！

你下载到硬件里，然后一步步调试，按F10，看卡在哪个函数那了。就好找下一步的错误了。。

你用的什么板子，，原因有2个。。第一个是静态id 还是动态的ID，，，宏定义#define LWIP_DHCP 必须置1    第二个就是板子的硬件，，，，你用的什么网络接口，enc28j60还是其他，，，在看看spi初始化引脚配制