usb通讯时readfile没有响应。

Question

上位机和单片机使用标准usb协议通讯，上位机的相关代码：//这里的详细代码没有给出。
openDevice();
openHandles();
//重点：
        int result = FileIOApiDeclarations.WriteFile(this._WriteHandle,ref command[0], command.Length,ref TxdBytes, 0);
                if (result == 0)
                {
                    int error = Usb.DebuggingDeclarations.GetLastError();
                    string str = "";
                    long size = 0;
                    Usb.DebuggingDeclarations.FormatMessage(Usb.DebuggingDeclarations.FORMAT_MESSAGE_ALLOCATE_BUFFER | Usb.DebuggingDeclarations.FORMAT_MESSAGE_FROM_SYSTEM | Usb.DebuggingDeclarations.FORMAT_MESSAGE_IGNORE_INSERTS, ref size, error, 0, str, 0, 0);
                    Log.WriteLog("error when set read command" + str);
                    this.closeHandles();
                    return retResult;
                }
                //FileIOApiDeclarations.CloseHandle(this._WriteHandle);
                int relReaded = 0;
                Usb.FileIOApiDeclarations.OVERLAPPED overlapped = new Usb.FileIOApiDeclarations.OVERLAPPED();
                this.PrepareForOverlappedTransfer(ref overlapped);
                System.Threading.Thread.Sleep(500);
                result = FileIOApiDeclarations.ReadFile(this._ReadHandle, ref data[0], length, ref relReaded, ref overlapped);
                /*错误出现在此处，每次到这里程序完全没有响应了，拔掉USB设备时程序下行，GetLastError会返回31
                 前边的获取GUID，writeFlie都是正确的  */
                if (result == 0) // error handle
                {
                    int error = Usb.DebuggingDeclarations.GetLastError();
                    if (error == FileIOApiDeclarations.ERROR_IO_PENDING)
                    {
                        FileIOApiDeclarations.WaitForSingleObject(overlapped.hEvent, 30000);
                        int readBytes = 0;
                        result = FileIOApiDeclarations.GetOverlappedResult(this._ReadHandle, ref overlapped, ref readBytes, false);
                        if (result != 0)
                            retResult = true;
                    }单片机相关代码：   init_USBused();
   init_TimerA();
         init_TimerB();
         RWsw = P2IN & BIT5;        // for USB Write Data
         if(RWsw == 0)
     {
     FCTL2 = FWKEY + FSSEL0 + FN0;
     FlashErase(ipatient);
     FlashErase(isetup);
     }    MCU_D12RST_0;                             //片选usb
   _NOP();
   MCU_D12RST_1;                             //reset usb 芯片   bEPPflags.value = 0;
   _EINT();
   reconnect_USB();
   P1IE = 0X04;
   opcode = 0xff;
   index = 0;
   while(1)
   {
          if (bEPPflags.bits.ep2_rxdone)              //端点2接收响应
          {
            bEPPflags.bits.ep2_rxdone = 0;            //flag set zero            if(opcode == 0xff)
            {
              //D12_ReadEndpoint(4, 6, EpBuf);
              if(EpBuf[0] == 0x01)//if(EpBuf[0] == 0x01)
              {
                opcode = 1;
                addr = EpBuf[2]*0x100 + EpBuf[3];
                length = EpBuf[4]*0x100 + EpBuf[5];
                cur_addr = addr;
                fileoff = 0;
              }
              else if(EpBuf[0] == 0x00)
              {
                opcode = 0;
                addr = EpBuf[2]*0x100 + EpBuf[3];
                length = EpBuf[4]*0x100 + EpBuf[5];
                cur_addr = addr;
                fileoff = 0;
              }
             }            else if(opcode == 1)                            //将usb接到的数据写入寄存器           
           {
              if(index == 256)
               {
                index = 0;
                for(ptr = 0; ptr < 256; ptr++,cur_addr++)
                  FlashWB(cur_addr,data[ptr]);                fileoff += 256;
                if(fileoff == length)
                {
                  opcode = 0xff;
                  fileoff = 0;
                  index = 0;
                }              }
            }
          }//if bEPPflags.bits.ep2_rxdone          if(opcode == 0)                            //read operation
          {
              if(rindex == 0)
              {
                for(ptr = 0; ptr < 256; ptr++,cur_addr++)
                  data[ptr] = *(char *)(cur_addr);              }
              _DINT();
              D12_WriteEndpoint(5,64,&data[rindex]);    //通过point5传输数据
              _EINT();  
              rindex = (rindex + 64) % 256;              fileoff += 64;
              //D12_WriteEndpoint(5,64,&data[index]);
              //index = (index + 64) % 256;
              if(fileoff == length)
              {
                  opcode = 0xff;
                  fileoff = 0;
                  rindex = 0;
                  index = 0;
                  icount = 0;
              }
            }           if (bEPPflags.bits.timer)
            {                               //计时器中断响应
              bEPPflags.bits.timer = 0;
            }           if (bEPPflags.bits.bus_reset)
          {                                 //总线重起中断响应
            _DINT();
            bEPPflags.bits.bus_reset = 0;
            _EINT();
          } // if bus reset          if (bEPPflags.bits.suspend)
          {                               //挂起中断响应
            _DINT();
            bEPPflags.bits.suspend= 0;
            _EINT();
            if((P4OUT & D12_SUSPD) == D12_SUSPD)
            {
              D12_SUSPD_0;
              P5DIR = 0XFF;
              P5OUT = 0xFF;
              P5DIR = 0X0;
              P4DIR = 0XFF;
              P4OUT = 0xFF;
              D12_SetDMA(0xC3);
              D12_SUSPD_1;
            }
          } // if suspend change          if (bEPPflags.bits.setup_packet)
          {                               //接收到设置包中断处理
            _DINT();
            bEPPflags.bits.setup_packet = 0;
            control_handler();
            _EINT();
                              //P1OUT |=D12SUSPD;
          } // if setup_packet
        } // Main Loop

Answer 1

也是遇到这个问题，有没有高手解决一下啊，会不会是固件程序的问题啊，