Solved!== Wince 6.0---Serial Driver or Kernel Problem?

Question

Samsung SMDKV210 Dev Board with a LCD and 4 serial ports (COM1 to COM4). A computer sends data (in packet one by one) regularly to the board through COM1. When the interval time of the packets is over 120ms, the application run on the Dev board receives
each packet on time (T + 120xN). If the interval time is less than 110ms, such as 60ms, the app receives the data in 360ms intervally, 6 packets once a time (T + 360xN). I checked the source code but found nothing. Is there anything wrong in the CE
kernel? Could anyone help me? Thanks.
2014.12.21

Answer 1

BOOL CPSerialPort::OpenPort(LPCTSTR Port,int BaudRate,int DataBits,int StopBits,int Parity,LPDataArriveProc proc,DWORD userdata)
    m_lpDataArriveProc=proc;
    m_dwUserData=userdata;
    if(m_hComm==INVALID_HANDLE_VALUE)
        m_hComm=CreateFile(Port,GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,0,0);
        if(m_hComm==INVALID_HANDLE_VALUE )
            AfxMessageBox(_T("Cannot open Port"));
            return FALSE;
        GetCommState(m_hComm,&dcb);
        dcb.BaudRate=BaudRate;
        dcb.ByteSize=DataBits;
        dcb.Parity=Parity;
        dcb.StopBits=StopBits;
        dcb.fParity=FALSE;
        dcb.fBinary=TRUE;
        dcb.fDtrControl=0;
        dcb.fRtsControl=0;
        dcb.fOutX=dcb.fInX=dcb.fTXContinueOnXoff=0;
        SetCommMask(m_hComm,EV_RXCHAR);        
        SetupComm(m_hComm,16384,16384);        
        if(!SetCommState(m_hComm,&dcb))
            AfxMessageBox(_T("Cannot setup Comm"));
            PurgeComm(m_hComm,PURGE_TXCLEAR|PURGE_RXCLEAR);
            ClosePort();
            return FALSE;
        GetCommTimeouts(m_hComm,&CommTimeOuts);        
        CommTimeOuts.ReadIntervalTimeout=100;
        CommTimeOuts.ReadTotalTimeoutMultiplier=1;
        CommTimeOuts.ReadTotalTimeoutConstant=100;
        CommTimeOuts.WriteTotalTimeoutMultiplier=0;
        CommTimeOuts.WriteTotalTimeoutConstant=0;    
        if(!SetCommTimeouts(m_hComm,&CommTimeOuts))
            AfxMessageBox(_T("Cannot setup Timerouts"));
            PurgeComm(m_hComm,PURGE_TXCLEAR|PURGE_RXCLEAR);
            ClosePort();
            return FALSE;
        PurgeComm(m_hComm,PURGE_TXCLEAR|PURGE_RXCLEAR);        
        return TRUE;        
    return FALSE;
Dear Bruce,
I hope you "hit the target". Those parameters underlined above will be adjusted in tomorrow morning's test, and I will inform you the result asap.
BEST RGDS
JWenbin