[参考译文] TMS570LS1227：EMACRxIntISR RX 和 Tx 处理程序 API 引起令人困惑的语句

您好！

我们有关此主题的专家今天不在办公室,请期待下周早些时候的答复,谢谢。

此致、

Ralph Jacobi

你好,谢谢你的答复。

下面是关于我的疑问的最新动态：当emacRxNotification(hdkif)调用回调函数时、我将把接收到的数据更新到 Mongoose 堆栈。 进一步检查 lwIP 代码后、我注意到emacRxNotification会进行检查EMAC_BUF_DESC_SOP并EMAC_BUF_DESC_EOP处理最大缓冲数据。 是否必须执行这些检查以确保接收最大缓冲数据？

此致、

Sandeep C

查询更新：

接收：Rx 处理程序

void EMACReceive(hdkif_t *hdkif)
{
  rxch_t *rxch_int;
  volatile emac_rx_bd_t *curr_bd, *curr_tail, *last_bd;

  /* The receive structure that holds data about a particular receive channel */
  rxch_int = &(hdkif->rxchptr);

  /* Get the buffer descriptors which contain the earliest filled data */
  /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
  curr_bd = rxch_int->active_head;
  /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
  last_bd = rxch_int->active_tail;

  /**
   * Process the descriptors as long as data is available
   * when the DMA is receiving data, SOP flag will be set
  */
  /*SAFETYMCUSW 28 D MR:NA <APPROVED> "Hardware status bit read check" */
  /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
  /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
  while((curr_bd->flags_pktlen & EMAC_BUF_DESC_SOP) == EMAC_BUF_DESC_SOP) {

      whilecnt1++;

    /* Start processing once the packet is loaded */
    /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
    /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */   
    if((curr_bd->flags_pktlen & EMAC_BUF_DESC_OWNER) != EMAC_BUF_DESC_OWNER) {

      /* this bd chain will be freed after processing */
      /*SAFETYMCUSW 71 S MR:17.6 <APPROVED> "Assigned pointer value has required scope." */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */
      rxch_int->free_head = curr_bd;

      /* Get the total length of the packet. curr_bd points to the start
       * of the packet.
       */

      /* 
       * The loop runs till it reaches the end of the packet.
       */
      /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */          
      while((curr_bd->flags_pktlen & EMAC_BUF_DESC_EOP)!= EMAC_BUF_DESC_EOP)
      {
        /*Update the flags for the descriptor again and the length of the buffer*/
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        curr_bd->flags_pktlen = (uint32)EMAC_BUF_DESC_OWNER;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        curr_bd->bufoff_len = (uint32)MAX_TRANSFER_UNIT;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        last_bd = curr_bd;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        curr_bd = curr_bd->next;
        printf("whilecnt1 =%d\n\r",whilecnt1);

        countp++;

      }
      mg_tcpip_qwrite((void*)curr_bd->bufptr,curr_bd->bufoff_len, s_ifp);


      /* Updating the last descriptor (which contained the EOP flag) */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */          
        curr_bd->flags_pktlen = (uint32)EMAC_BUF_DESC_OWNER;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        curr_bd->bufoff_len = (uint32)MAX_TRANSFER_UNIT;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        last_bd = curr_bd;
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        curr_bd = curr_bd->next;

      /* Acknowledge that this packet is processed */
      /*SAFETYMCUSW 439 S MR:11.3 <APPROVED> "Address stored in pointer is passed as as an int parameter. - Advisory as per MISRA" */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
      EMACRxCPWrite(hdkif->emac_base, (uint32)EMAC_CHANNELNUMBER, (uint32)last_bd);

      /* The next buffer descriptor is the new head of the linked list. */
      /*SAFETYMCUSW 71 S MR:17.6 <APPROVED> "Assigned pointer value has required scope." */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
      rxch_int->active_head = curr_bd;

      /* The processed descriptor is now the tail of the linked list. */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
      curr_tail = rxch_int->active_tail;
    /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
      curr_tail->next = rxch_int->free_head;

      /* The last element in the already processed Rx descriptor chain is now the end of list. */
      /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */     
      last_bd->next = NULL;


        /**
         * Check if the reception has ended. If the EOQ flag is set, the NULL
         * Pointer is taken by the DMA engine. So we need to write the RX HDP
         * with the next descriptor.
         */
        /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */ 
        /*SAFETYMCUSW 134 S MR:12.2 <APPROVED> "LDRA Tool issue" */
      /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */            
        if((curr_tail->flags_pktlen & EMAC_BUF_DESC_EOQ) == EMAC_BUF_DESC_EOQ) {
          /*SAFETYMCUSW 439 S MR:11.3 <APPROVED> "Address stored in pointer is passed as as an int parameter. - Advisory as per MISRA" */
          /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */             
          EMACRxHdrDescPtrWrite(hdkif->emac_base, (uint32)(rxch_int->free_head), (uint32)EMAC_CHANNELNUMBER);
        }

        /*SAFETYMCUSW 71 S MR:17.6 <APPROVED> "Assigned pointer value has required scope." */
        /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */   
        /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are assigned in this driver" */   
        rxch_int->free_head  = curr_bd;
        rxch_int->active_tail = last_bd;
      }
    }
  whilecnt1=0;
}

TX 处理程序：

静态 size_t mg_TCPIP_driver_tms570_tx (const void * buf、size_t len、struct mg_TCPIP_if * ifp)
｛

sentcnt++；
pbuf_t tx_data；
tx_data.len=len；
tx_data.tot_len=len；
tx_data.payload=(uint8_t*) buf；
tx_data.next=NULL；

printf ("\n\n\r")；
INT I=0；

if (tx_data.len < 120)
for (i=0；i<tx_data.len；i++)
printf ("%#x "、TX_DATA.PAYLOAD[i])；
printf ("\n\n\r")；

EMACTransmit (&H dkif_data[0]、&TX_data)；

返回长度；
(无效) IFP；
}

当我使用上述代码时、如果 Wireshark 关闭 ping 命令、UDP 停止工作、但只有 Wireshark 捕获数据、则 ping 和 UDP 正常工作。

是否有任何更新？

此致、

Sandeep C

更新：  

ECU 到 PC 帧：

0xd4 0x81 0xd7 0x6b 0x7f 0xe4 0x2 0xc6 0x7E 0x81 0x6b 0x4b 0x8 0x6 0x0 0x1 0x8 0x0 0x6 0x4 0x0 0x2 0xc6 0x7E 0x81 0x6b 0x4b 0xc0 0xa8 0x

您能验证吗？ 是这样吗？