tserial_event.cpp

windowssoket编程,用事件驱动的方法读写串口数据

        
        if (hard_handshake)
        {
            dcb.fOutxDsrFlow    = TRUE;
            dcb.fOutxCtsFlow    = TRUE;
            dcb.fRtsControl     = RTS_CONTROL_HANDSHAKE;
            dcb.fDtrControl     = DTR_CONTROL_HANDSHAKE;
        }
        else
        {
            dcb.fOutxDsrFlow    = FALSE;
            dcb.fOutxCtsFlow    = FALSE;
            /* */
            dcb.fRtsControl     = RTS_CONTROL_ENABLE;
            dcb.fDtrControl     = DTR_CONTROL_ENABLE;
            /* * /
            dcb.fRtsControl     = RTS_CONTROL_DISABLE;
            dcb.fDtrControl     = DTR_CONTROL_DISABLE;
            /* */
        }
    
        /* OLD VERSION  (modifies 2005-05-16)

        dcb.fOutxCtsFlow    = 0;
        dcb.fOutxDsrFlow    = 0;
        dcb.fDtrControl     = DTR_CONTROL_DISABLE;
        dcb.fDsrSensitivity = 0;
        dcb.fRtsControl     = RTS_CONTROL_DISABLE;
        dcb.fOutX           = 0;
        dcb.fInX            = 0;
        
        */
        
        /* ----------------- misc parameters ----- */
        dcb.fErrorChar      = 0;
        dcb.fBinary         = 1;
        dcb.fNull           = 0;
        dcb.fAbortOnError   = 0;
        dcb.wReserved       = 0;
        dcb.XonLim          = 2;
        dcb.XoffLim         = 4;
        dcb.XonChar         = 0x13;
        dcb.XoffChar        = 0x19;
        dcb.EvtChar         = 0;
        
        /* -------------------------------------------------------------------- */
        serial_handle    = CreateFile(port, GENERIC_READ | GENERIC_WRITE,
                   0, NULL, OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
                   // opening serial port

        ovReader.hEvent    = serial_events[SIG_READER];
        ovWriter.hEvent    = serial_events[SIG_WRITER];
        ovWaitEvent.hEvent = serial_events[SIG_MODEM_EVENTS];

        if (serial_handle    != INVALID_HANDLE_VALUE)
        {
            if (check_modem)
            {
                if(!SetCommMask(serial_handle, EV_RING | EV_RLSD))
                    erreur = 1;
            }
            else
            {
                if(!SetCommMask(serial_handle, 0))
                    erreur = 1;
            }

                
            // set timeouts
            if(!SetCommTimeouts(serial_handle,&cto))
                erreur = 2;

            // set DCB
            if(!SetCommState(serial_handle,&dcb))
                erreur = 4;
        }
        else
            erreur = 8;
    }
    else
        erreur = 16;


    /* --------------------------------------------- */
    for (i=0; i<SERIAL_SIGNAL_NBR; i++)
    {
        if (serial_events[i]==INVALID_HANDLE_VALUE)
            erreur = 32;
    }

    /* --------------------------------------------- */
    if (erreur!=0)
    {
        CloseHandle(serial_handle);
        serial_handle = INVALID_HANDLE_VALUE;
    }
    else
    {
        // start thread
        thread_handle = (HANDLE) _beginthreadex(NULL,0,
                  (PBEGINTHREADEX_THREADFUNC) Tserial_event_thread_start,
                   this, 0, &threadid);
        /*if (thread_handle==-1)
            thread_handle=0;   */
    }

    /* --------------------------------------------- */
    return(erreur);
}
/* -------------------------------------------------------------------- */
/* ---------------------           setManager     --------------------- */
/* -------------------------------------------------------------------- */
void         Tserial_event::setManager(type_myCallBack manager_arg)
{
        manager = manager_arg;
}
/* -------------------------------------------------------------------- */
/* ---------------------           setRxSize      --------------------- */
/* -------------------------------------------------------------------- */
void         Tserial_event::setRxSize(int size)
{
        max_rx_size = size;
        if (max_rx_size>SERIAL_MAX_RX)
            max_rx_size = SERIAL_MAX_RX;
}
/* -------------------------------------------------------------------- */
/* ---------------------           setManager     --------------------- */
/* -------------------------------------------------------------------- */
char *      Tserial_event::getDataInBuffer(void)
{
    return(rxBuffer);
}
/* -------------------------------------------------------------------- */
/* ---------------------           setManager     --------------------- */
/* -------------------------------------------------------------------- */
int      Tserial_event::getDataInSize(void)
{
    return(received_size);
}
/* -------------------------------------------------------------------- */
/* ---------------------           setManager     --------------------- */
/* -------------------------------------------------------------------- */
void   Tserial_event::dataHasBeenRead(void)
{
    SetEvent(serial_events[SIG_READ_DONE]);
}
/* -------------------------------------------------------------------- */
/* -----------------------   getNbrOfBytes  --------------------------- */
/* -------------------------------------------------------------------- */
int Tserial_event::getNbrOfBytes    (void)
{
    struct _COMSTAT status;
    int             n;
    unsigned long   etat;

    n = 0;

    if (serial_handle!=INVALID_HANDLE_VALUE)
    {
        ClearCommError(serial_handle, &etat, &status);
        n = status.cbInQue;
    }
    return(n);
}
/* -------------------------------------------------------------------- */
/* --------------------------    sendData     ------------------------- */
/* -------------------------------------------------------------------- */
void Tserial_event::sendData (char *buffer, int size)
{
    if ((!tx_in_progress) && (size<SERIAL_MAX_TX) && (buffer!=0))
    {
        tx_in_progress = 1;
        memcpy(txBuffer, buffer, size);
        tx_size = size;
        SetEvent(serial_events[SIG_DATA_TO_TX]);
        // indicating data to be sent
    }
}
/* -------------------------------------------------------------------- */
/* --------------------------    OnEvent      ------------------------- */
/* -------------------------------------------------------------------- */
void Tserial_event::OnEvent (unsigned long events)
{
    unsigned long ModemStat;

    GetCommModemStatus(serial_handle, &ModemStat);

    if ((events & EV_RING)!=0)
    {
        if ((ModemStat &  MS_RING_ON)!= 0)
        {
            if (manager!=0)
                manager((uint32) this, SERIAL_RING);
        }
    }

    if ((events & EV_RLSD)!=0)
    {
        if ((ModemStat &  MS_RLSD_ON)!= 0)
        {
            if (manager!=0)
                manager((uint32) this, SERIAL_CD_ON);
        }
        else
        {
            if (manager!=0)
                manager((uint32) this, SERIAL_CD_OFF);
        }
    }
}
/* -------------------------------------------------------------------- */
/* --------------------------       run       ------------------------- */
/* -------------------------------------------------------------------- */

/**
 this function is the main loop of the Tserial object. There is a
 do while() loop executed until either an error or a PowerDown is 
 received.
 this is not a busy wait since we use the WaitForMultipleObject function
*/

/* * /
#define DEBUG_EVENTS
/* */

void Tserial_event::run(void)
{
    bool          done;
    long          status;
    unsigned long read_nbr, result_nbr;
    char          success;

    ready                   = true;
    done                    = false;
    tx_in_progress          = 0;
    rx_in_progress          = 0;
    WaitCommEventInProgress = 0;

    if (manager!=0)
        manager((uint32) this, SERIAL_CONNECTED);

    GetLastError();               // just to clear any pending error
    SetEvent(serial_events[SIG_READ_DONE]);
    if (check_modem)
        SetEvent(serial_events[SIG_MODEM_CHECKED]);

    /* ----------------------------------------------------------- */
    while(!done)
    {
        /* ------------------------------------------------------------------ */
        /*                                                                    */
        /*                                                                    */
        /*                                                                    */
        /*                          Waiting  for signals                      */
        /*                                                                    */