C# 串口类SerialPort的使用方法

序言:最近做了一个智能体育项目——跆拳道积分系统,硬件部分会向软件传入振动值等数据,链接方式为串口,所以用到SerialPort类。

值得注意的是:

  DataReceived 方法,当串口缓冲区有数据时执行该方法。

  ReceivedBytesThreshold属性决定了当串口读缓存中数据多少个时才触发DataReceived事件,默认为1。串口接收的指令可能是错误值,所以这块根据自己需求进行设置。

首先需要引用SerialPort

using System.IO.Ports;

创建全局串口对象

SerialPort com;

SerialPort配置,并打开端口进行接收数据

private void Form1_Load(object sender, EventArgs e)
{
    com = new SerialPort("COM5");       //实例化SerialPort并设置COM口
    com.BaudRate = 115200;//波特率
    com.Parity = Parity.None;//无奇偶校验位
    com.StopBits = StopBits.Two;//两个停止位
    com.Handshake = Handshake.RequestToSend;//控制协议
    com.ReceivedBytesThreshold = 13;//设置 DataReceived 事件发生前内部输入缓冲区中的字节数,我这里是13字节为一组
    com.Open();                 //打开串口  
    com.DataReceived += new SerialDataReceivedEventHandler(Com_DataReceived);           //接受数据线程
}
/// <summary>
/// 监听串口数据线程
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    try
    {
        if (com.IsOpen)
        {
            byte[] readBuffer = new byte[com.ReadBufferSize + 1];
            try
            { 
                int count = com.Read(readBuffer, 0, com.ReadBufferSize);        //读取串口数据(监听)
                //String SerialIn = System.Text.Encoding.ASCII.GetString(readBuffer, 0, count); 
                if (count != 0)
                {
                    //将返回值byte数组转换为string类型数据
                    String result = bytesToHexString(readBuffer); 

                    //这里强调一下,线程里不可以直接对UI进行赋值
                    this.BeginInvoke(new System.Threading.ThreadStart(delegate ()
                    {
                        textBox1.Text = result;         //对控件进行赋值
                    }));
                }
            }
            catch (TimeoutException) { }
        }
        else
        {
            TimeSpan waitTime = new TimeSpan(0, 0, 0, 0, 50);
            Thread.Sleep(waitTime);
        }
    }
    catch (Exception ex)
    {

    }
}

Byte数组转换成16进制方法

/// <summary>
/// Byte数组转换成16进制
/// </summary>
/// <param name="bArr"></param>
/// <returns></returns>
String bytesToHexString(byte[] bArr)
{
    string result = string.Empty;
    for (int i = 0; i < 13; i++)//逐字节变为16进制字符,以%隔开
    {
        result += Convert.ToString(bArr[i], 16).ToUpper().PadLeft(2, '0') + " ";
    }
    return result;
}

发送数据

/// <summary>
/// 发送数据
/// </summary>
void SendData()
{
    Byte[] TxData = { 1, 2, 3, 4, 5, 6, 7, 8 };
    com.Write(TxData, 0, 8);
}

续补:串口数据接受不完整处理方法

        /// <summary>
        /// 监听串口数据线程
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            { 
                if (com.IsOpen)
                {
                    try
                    {
                        int byteNumber = com.BytesToRead; 
                        Thread.Sleep(20); 

                        //延时等待数据接收完毕。
                        while ((byteNumber < com.BytesToRead) && (com.BytesToRead < 4800))
                        {
                            byteNumber = com.BytesToRead;
                            Thread.Sleep(20);
                        } 

                        int n = com.BytesToRead; //记录下缓冲区的字节个数 
                        byte[] buf = new byte[n]; //声明一个临时数组存储当前来的串口数据 
                        com.Read(buf, 0, n); //读取缓冲数据到buf中,同时将这串数据从缓冲区移除 
                        
                        //设置文字显示
                        Control.CheckForIllegalCrossThreadCalls = false;
                        StringBuilder sb = new StringBuilder();
                        for (int i = 0; i < n; i++)
                        {
                            string s;
                            if (buf[i] < 16)
                                s = "0" + Convert.ToString(buf[i], 16).ToUpper() + " ";
                            else
                                s = Convert.ToString(buf[i], 16).ToUpper() + " ";


                            sb.Append(s);
                        }
                        textBox3.Text += sb.ToString() +"\r\n"; 
                    }
                    catch (Exception ee)
                    {
                    }
                }
                else
                {
                    TimeSpan waitTime = new TimeSpan(0, 0, 0, 0, 50);
                    Thread.Sleep(waitTime);
                }
                Thread.Sleep(200);
            }
            catch (Exception ex)
            {

            }
        }

 

 

到这里就结束了,网上也有一些测试串口数据的程序,我这也有一个但是不记得在哪里下载的了,如果有需要跟我吱一声~

  

posted @ 2018-07-25 15:52  没事儿写个bug  阅读(8481)  评论(18编辑  收藏  举报