C#串口编程

串口设置

            sp = new SerialPort(comboBox1.SelectedItem.ToString(), int.Parse(comboBox2.SelectedItem.ToString()), parity,
                int.Parse(comboBox4.SelectedItem.ToString()), stopBits);
            sp.ReceivedBytesThreshold = 16;
            sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
            sp.Open();

串口数据接收事件

        void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                if (isClosing)
                {
                    return;
                }
                if (!isReading)
                {
                    sp.ReceivedBytesThreshold = 10000;
                    if (watch == null)
                    {
                        watch = Stopwatch.StartNew();
                        watch.Start();
                        lastTimeLeft = TimeSpan.Zero;
                    }
                    else
                    {
                        if (sp.BytesToRead > 1024)
                            sp.DiscardInBuffer();
                        else
                        {
                            isReading = true;
                            while (sp.BytesToRead >= 16)
                            {
                                if (sp.ReadByte() == 0xAA && sp.ReadByte() == 0x55)
                                {
                                    sp.Read(dataReceived, 0, dataReceived.Length);
                                    allData.AddRange(dataReceived);
                                }
                            }
                            isReading = false;
                        }
                    }

                    sp.ReceivedBytesThreshold = 16;
                }
            }
            catch
            {
                MessageBox.Show("端口接受数据有错误，请重新打开端口！");
            }
        }

串口数据解析

            while (allData.Count >= 14)
            {
                a = (Int16)(allData[1] | allData[2] << 8);
                if (MaxOfRound < Math.Abs(a))
                {
                    MaxOfRound = a;
                }
                aY = (Int16)(allData[3] | allData[4] << 8);
                if (MaxOfRoundY < Math.Abs(aY))
                {
                    MaxOfRoundY = aY;
                }
                allData.RemoveRange(0, 14);
            }