清空串口的缓存及应用

最新推荐文章于 2025-06-26 11:13:55 发布

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#c++ #串口通信

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本文介绍了一种基于Windows API的串口通信读写实现方法。通过使用PurgeComm进行串口清理，确保通信正常进行，并利用ReadFile与WriteFile进行数据的接收与发送。在读取数据时，通过循环直至接收到指定长度的数据；在写入数据时，则确保所有数据都被成功发送。

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PurgeComm(hCom, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);

Read(int len)
{
BOOL rtn = TRUE;
iRecvLen = len;
DWORD dwAllRecv = 0;
memset(szRecv,0,sizeof(szRecv));
int Count =0;
while(TRUE)
{
  Count++;
  DWORD len1 = 0;
  OVERLAPPED overread;

  //overread.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);

  DWORD dwBytesRead=len;
  COMSTAT ComStat;
  DWORD dwErrorFlags;

  memset(&overread,0,sizeof(overread));

  if(!ClearCommError(hCom,&dwErrorFlags,&ComStat))
  {
   PurgeComm(hCom, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
   rtn = FALSE;
   break;
  }

  dwBytesRead=min(dwBytesRead,(DWORD)ComStat.cbInQue);

  if(dwBytesRead == 0)
  {
   if(Count > 100)
   {
    rtn = FALSE;
    break;
   }
   else
   {
    Sleep(5);
    continue;
   }

  }
  len1 = 0;
  BOOL bSucess = ::ReadFile(hCom,szRecv+dwAllRecv,dwBytesRead,&len1,&overread);
  if(!bSucess)
  {
   if(GetLastError() == ERROR_IO_PENDING)
   {
    if(GetOverlappedResult(hCom,&overread,&len1,TRUE))
    {
     rtn = TRUE;
     dwAllRecv += len1;
    }
    else
    {
     rtn = FALSE;
     break;
    }
   }
   else
   {
    rtn = FALSE;
    break;;

   }
  }
  else
  {
   rtn = TRUE;
   dwAllRecv += len1;
  }

  if(dwAllRecv == len)
  {
   rtn = TRUE;
   break;
  }
  Sleep(5);
}

return rtn;
}

BOOL Write(char *pSend,DWORD len)
{
// return FALSE;
if(hCom == INVALID_HANDLE_VALUE)
return FALSE;
DWORD len1 = 0;

COMSTAT ComStat;
DWORD dwErrorFlags;
OVERLAPPED overwrite;
memset(&overwrite,0,sizeof(overwrite));
BOOL rtn = TRUE;
PurgeComm(hCom, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
if(!ClearCommError(hCom,&dwErrorFlags,&ComStat))
{
  DWORD Code = GetLastError();
  PurgeComm(hCom, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
  rtn = FALSE;
  return rtn;
}

len1 = 0;
BOOL bSucess = ::WriteFile(hCom,pSend,len,&len1,&overwrite);

DWORD written = 0;
DWORD n = 0;
if(!bSucess)
{
  if(GetLastError() == ERROR_IO_PENDING)
  {
   if(GetOverlappedResult(hCom,&overwrite,&len1,TRUE))
   {
    rtn = TRUE;
   }
   else
   {
    rtn = FALSE;
   }
  }
  else
  {
   rtn = FALSE;
  }
}
else
{
  rtn = TRUE;
}

return rtn;
}