Exemplo n.º 1
0
        /// <summary>
        /// Opens the com port and configures it with the required settings
        /// </summary>
        /// <returns>false if the port could not be opened</returns>
        public bool Open()
        {
            var portDcb = new DCB();
            var commTimeouts = new COMMTIMEOUTS();
            var wo = new OVERLAPPED();

            if (_online) return false;

            _hPort = Win32Com.CreateFile(PortName, Win32Com.GENERIC_READ | Win32Com.GENERIC_WRITE, 0, IntPtr.Zero,
                Win32Com.OPEN_EXISTING, Win32Com.FILE_FLAG_OVERLAPPED, IntPtr.Zero);
            if (_hPort == (IntPtr)Win32Com.INVALID_HANDLE_VALUE)
            {
                if (Marshal.GetLastWin32Error() == Win32Com.ERROR_ACCESS_DENIED)
                {
                    return false;
                }
                throw new CommPortException("Port Open Failure");
            }

            _online = true;

            commTimeouts.ReadIntervalTimeout = 0;
            commTimeouts.ReadTotalTimeoutConstant = 0;
            commTimeouts.ReadTotalTimeoutMultiplier = 0;
            commTimeouts.WriteTotalTimeoutConstant = SendTimeoutConstant;
            commTimeouts.WriteTotalTimeoutMultiplier = SendTimeoutMultiplier;
            portDcb.Init(((Parity == Parity.Odd) || (Parity == Parity.Even)), TxFlowCts, TxFlowDsr,
                (int)UseDtr, RxGateDsr, !TxWhenRxXoff, TxFlowX, RxFlowX, (int)UseRts);
            portDcb.BaudRate = BaudRate;
            portDcb.ByteSize = (byte)DataBits;
            portDcb.Parity = (byte)Parity;
            portDcb.StopBits = (byte)StopBits;
            portDcb.XoffChar = (byte)XoffChar;
            portDcb.XonChar = (byte)XonChar;
            portDcb.XoffLim = (short)RxHighWater;
            portDcb.XonLim = (short)RxLowWater;
            if ((RxQueue != 0) || (TxQueue != 0))
                if (!Win32Com.SetupComm(_hPort, (uint)RxQueue, (uint)TxQueue)) ThrowException("Bad queue settings");
            if (!Win32Com.SetCommState(_hPort, ref portDcb)) ThrowException("Bad com settings");
            if (!Win32Com.SetCommTimeouts(_hPort, ref commTimeouts)) ThrowException("Bad timeout settings");

            _stateBrk = 0;
            if (UseDtr == HsOutput.None) _stateDtr = 0;
            if (UseDtr == HsOutput.Online) _stateDtr = 1;
            if (UseRts == HsOutput.None) _stateRts = 0;
            if (UseRts == HsOutput.Online) _stateRts = 1;

            _checkSends = CheckAllSends;
            wo.Offset = 0;
            wo.OffsetHigh = 0;
            wo.hEvent = _checkSends ? _writeEvent.Handle : IntPtr.Zero;
            _ptrUwo = Marshal.AllocHGlobal(Marshal.SizeOf(wo));
            Marshal.StructureToPtr(wo, _ptrUwo, true);
            _writeCount = 0;

            _rxException = null;
            _rxExceptionReported = false;
            _rxThread = new Thread(ReceiveThread)
                            {
                                Name = "CommBaseRx",
                                Priority = ThreadPriority.AboveNormal
                            };
            _rxThread.Start();
            Thread.Sleep(1); //Give rx thread time to start. By documentation, 0 should work, but it does not!

            _auto = false;
            if (AfterOpen())
            {
                _auto = AutoReopen;
                return true;
            }
            Close();
            return false;
        }
Exemplo n.º 2
0
 internal static extern Boolean SetCommTimeouts(IntPtr hFile, [In] ref COMMTIMEOUTS lpCommTimeouts);
Exemplo n.º 3
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 internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts);
Exemplo n.º 4
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 internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts);
Exemplo n.º 5
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 internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts);
Exemplo n.º 6
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 internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts);