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C#(066):串口编程 System.IO.Ports.SerialPort类

作者:互联网

从Microsoft .Net
2.0版本以后,就默认提供了System.IO.Ports.SerialPort类,用户可以非常简单地编写少量代码就完成串口的信息收发程序。

1. 串口硬件信号定义

DB9 Connector 信号定义。串口测试将2、3针脚短接即可。

Image1

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2、串口端口号搜索

    string[] portList = System.IO.Ports.SerialPort.GetPortNames();
    for (int i = 0; i < portList.Length; i++)
    {
        string name = portList[i];
        comboBox.Items.Add(name);
    }

还有一种通过调用API的方法来获取实现,可以获取详细的完整串口名称,对于USB-to-COM虚拟串口来说特别适用。

3、串口属性参数设置

    SerialPort mySerialPort = new SerialPort("COM2");//端口
    mySerialPort.BaudRate = 9600;//波特率
    mySerialPort.Parity = Parity.None;//校验位
    mySerialPort.StopBits = StopBits.One;//停止位
    mySerialPort.DataBits = 8;//数据位
    mySerialPort.Handshake = Handshake.Non;
    mySerialPort.ReadTimeout = 1500;
    mySerialPort.DtrEnable = true;//启用数据终端就绪信息
    mySerialPort.Encoding = Encoding.UTF8;
    mySerialPort.ReceivedBytesThreshold = 1;//DataReceived触发前内部输入缓冲器的字节数
    mySerialPort.DataReceived += new SerialDataReceivedEvenHandler(DataReceive_Method);
    
    mySerialPort.Open();

4、串口发送信息

    // Write a string
    port.Write("Hello World");
    
    // Write a set of bytes
    port.Write(new byte[] { 0x0A, 0xE2, 0xFF }, 0, 3);
    
    // Close the port
    port.Close();

5. 串口接收信息

    string serialReadString;
    
    
    private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        serialReadString = port.ReadExisting());
        this.txt1.Invoke( new MethodInvoker(delegate { this.txt1.AppendText(serialReadString); }));
    }

6、循环接收数据

    void com_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        // Use either the binary OR the string technique (but not both)
        // Buffer and process binary data
        while (com.BytesToRead > 0)
            bBuffer.Add((byte)com.ReadByte());
        ProcessBuffer(bBuffer);
    
        // Buffer string data
        sBuffer += com.ReadExisting();
        ProcessBuffer(sBuffer);
    }
    
    private void ProcessBuffer(string sBuffer)
    {
        // Look in the string for useful information
        // then remove the useful data from the buffer
    }
    
    private void ProcessBuffer(List<byte> bBuffer)
    {
        // Look in the byte array for useful information
        // then remove the useful data from the buffer
    }

标签:string,066,C#,SerialPort,Write,串口,缓冲区,mySerialPort
来源: https://www.cnblogs.com/springsnow/p/16272335.html