eth 发送繁忙失败

发布于 2021-09-06 09:58:22 浏览：1637 订阅该版

tcp或udp长时间通信
log出现
```
[60094] E/drv.emac: eth transmit frame faild: 2
```

`rt_err_t rt_stm32_eth_tx(rt_device_t dev, struct pbuf *p)`函数中
```c
state = HAL_ETH_TransmitFrame(&EthHandle, framelength);
if (state != HAL_OK)
{
    LOG_E("eth transmit frame faild: %d", state);
}
```c
但是HAL_ETH_TransmitFrame函数内根本就不会返回2（HAL_BUSY），这是什么鬼
```c
HAL_StatusTypeDef HAL_ETH_TransmitFrame(ETH_HandleTypeDef *heth, uint32_t FrameLength)
{
  uint32_t bufcount = 0U, size = 0U, i = 0U;
  
  /* Process Locked */
  __HAL_LOCK(heth);
  
  /* Set the ETH peripheral state to BUSY */
  heth->State = HAL_ETH_STATE_BUSY;
  
  if (FrameLength == 0U) 
  {
    /* Set ETH HAL state to READY */
    heth->State = HAL_ETH_STATE_READY;
    
    /* Process Unlocked */
    __HAL_UNLOCK(heth);
    
    return  HAL_ERROR;                                    
  }  
  
  /* Check if the descriptor is owned by the ETHERNET DMA (when set) or CPU (when reset) */
  if(((heth->TxDesc)->Status & ETH_DMATXDESC_OWN) != (uint32_t)RESET)
  {  
    /* OWN bit set */
    heth->State = HAL_ETH_STATE_BUSY_TX;
    
    /* Process Unlocked */
    __HAL_UNLOCK(heth);
    
    return HAL_ERROR;
  }
  
  /* Get the number of needed Tx buffers for the current frame */
  if (FrameLength > ETH_TX_BUF_SIZE)
  {
    bufcount = FrameLength/ETH_TX_BUF_SIZE;
    if (FrameLength % ETH_TX_BUF_SIZE) 
    {
      bufcount++;
    }
  }
  else 
  {  
    bufcount = 1U;
  }
  if (bufcount == 1U)
  {
    /* Set LAST and FIRST segment */
    heth->TxDesc->Status |=ETH_DMATXDESC_FS|ETH_DMATXDESC_LS;
    /* Set frame size */
    heth->TxDesc->ControlBufferSize = (FrameLength & ETH_DMATXDESC_TBS1);
    /* Set Own bit of the Tx descriptor Status: gives the buffer back to ETHERNET DMA */
    heth->TxDesc->Status |= ETH_DMATXDESC_OWN;
    /* Point to next descriptor */
    heth->TxDesc= (ETH_DMADescTypeDef *)(heth->TxDesc->Buffer2NextDescAddr);
  }
  else
  {
    for (i=0U; i< bufcount; i++)
    {
      /* Clear FIRST and LAST segment bits */
      heth->TxDesc->Status &= ~(ETH_DMATXDESC_FS | ETH_DMATXDESC_LS);
      
      if (i == 0U) 
      {
        /* Setting the first segment bit */
        heth->TxDesc->Status |= ETH_DMATXDESC_FS;  
      }
      
      /* Program size */
      heth->TxDesc->ControlBufferSize = (ETH_TX_BUF_SIZE & ETH_DMATXDESC_TBS1);
      
      if (i == (bufcount-1U))
      {
        /* Setting the last segment bit */
        heth->TxDesc->Status |= ETH_DMATXDESC_LS;
        size = FrameLength - (bufcount-1U)*ETH_TX_BUF_SIZE;
        heth->TxDesc->ControlBufferSize = (size & ETH_DMATXDESC_TBS1);
      }
      
      /* Set Own bit of the Tx descriptor Status: gives the buffer back to ETHERNET DMA */
      heth->TxDesc->Status |= ETH_DMATXDESC_OWN;
      /* point to next descriptor */
      heth->TxDesc = (ETH_DMADescTypeDef *)(heth->TxDesc->Buffer2NextDescAddr);
    }
  }
  
  /* When Tx Buffer unavailable flag is set: clear it and resume transmission */
  if (((heth->Instance)->DMASR & ETH_DMASR_TBUS) != (uint32_t)RESET)
  {
    /* Clear TBUS ETHERNET DMA flag */
    (heth->Instance)->DMASR = ETH_DMASR_TBUS;
    /* Resume DMA transmission*/
    (heth->Instance)->DMATPDR = 0U;
  }
  
  /* Set ETH HAL State to Ready */
  heth->State = HAL_ETH_STATE_READY;
  
  /* Process Unlocked */
  __HAL_UNLOCK(heth);
  
  /* Return function status */
  return HAL_OK;
}
```c