急，在线等！！为什么串口接受超过8位就出错啊？

jqq850226

急，在线等！！为什么串口接受超过8位就出错啊？ [复制链接]

//设置串口读写时间
COMMTIMEOUTS CommTimeOuts;
GetCommTimeouts (m_hComm, &CommTimeOuts);
CommTimeOuts.ReadIntervalTimeout = MAXDWORD;
CommTimeOuts.ReadTotalTimeoutMultiplier = 0;
CommTimeOuts.ReadTotalTimeoutConstant = 0;
CommTimeOuts.WriteTotalTimeoutMultiplier = 10;
CommTimeOuts.WriteTotalTimeoutConstant = 1000;
if(!SetCommTimeouts( m_hComm, &CommTimeOuts ))
{
TRACE( _T("SetCommTimeouts 返回错误") );
//关闭串口
CloseHandle (m_hComm);

m_hComm = INVALID_HANDLE_VALUE;
return FALSE;
}

//指定端口监测的事件集
SetCommMask (m_hComm, EV_RXCHAR);
//分配串口设备缓冲区
SetupComm(m_hComm,512,512);
//初始化缓冲区中的信息
PurgeComm(m_hComm,PURGE_TXCLEAR|PURGE_RXCLEAR);

关键代码如下，读线程中
      //清空串口
PurgeComm(ceSeries->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR );
SetCommMask (ceSeries->m_hComm, EV_RXCHAR | EV_CTS | EV_DSR );
while (TRUE)
{
if (WaitCommEvent(ceSeries->m_hComm,&evtMask,0))
{
SetCommMask (ceSeries->m_hComm, EV_RXCHAR | EV_CTS | EV_DSR );
删除这句可以接受大于16进制的数据，但是是错误的。保留则只收得到8个字节的数据，数据正确举例：16个字节，第一次只能读8个，正确，第2次读8个，也正确，改成GetCommMask效果一样，
//表示串口收到字符
if (evtMask & EV_RXCHAR)
{
ClearCommError(ceSeries->m_hComm,&dwReadErrors,&cmState);
willReadLen = cmState.cbInQue ;
if (willReadLen <= 0)
{
continue;
}
//分配内存
readBuf = new BYTE[willReadLen];
ZeroMemory(readBuf,willReadLen);
//读取串口数据
ReadFile(ceSeries->m_hComm, readBuf, willReadLen, &actualReadLen,0);