C# 串口類SerialPort的使用方法

序言：最近做了一個智能體育項目——跆拳道積分系統，硬件部分會向軟件傳入振動值等數據，鏈接方式為串口，所以用到SerialPort類。

值得注意的是：

　　DataReceived 方法,當串口緩沖區有數據時執行該方法。

　　ReceivedBytesThreshold屬性決定了當串口讀緩存中數據多少個時才觸發DataReceived事件，默認為1。串口接收的指令可能是錯誤值，所以這塊根據自己需求進行設置。

首先需要引用SerialPort

using System.IO.Ports;

創建全局串口對象

SerialPort com;

SerialPort配置，並打開端口進行接收數據

private void Form1_Load(object sender, EventArgs e)
{
    com = new SerialPort("COM5");       //實例化SerialPort並設置COM口
    com.BaudRate = 115200;//波特率
    com.Parity = Parity.None;//無奇偶校驗位
    com.StopBits = StopBits.Two;//兩個停止位
    com.Handshake = Handshake.RequestToSend;//控制協議
    com.ReceivedBytesThreshold = 13;//設置 DataReceived 事件發生前內部輸入緩沖區中的字節數,我這里是13字節為一組
    com.Open();                 //打開串口  
    com.DataReceived += new SerialDataReceivedEventHandler(Com_DataReceived);           //接受數據線程
}

/// <summary>
/// 監聽串口數據線程
/// </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);        //讀取串口數據(監聽)
                //String SerialIn = System.Text.Encoding.ASCII.GetString(readBuffer, 0, count); 
                if (count != 0)
                {
                    //將返回值byte數組轉換為string類型數據
                    String result = bytesToHexString(readBuffer); 

                    //這里強調一下,線程里不可以直接對UI進行賦值
                    this.BeginInvoke(new System.Threading.ThreadStart(delegate ()
                    {
                        textBox1.Text = result;         //對控件進行賦值
                    }));
                }
            }
            catch (TimeoutException) { }
        }
        else
        {
            TimeSpan waitTime = new TimeSpan(0, 0, 0, 0, 50);
            Thread.Sleep(waitTime);
        }
    }
    catch (Exception ex)
    {

    }
}

Byte數組轉換成16進制方法

/// <summary>
/// Byte數組轉換成16進制
/// </summary>
/// <param name="bArr"></param>
/// <returns></returns>
String bytesToHexString(byte[] bArr)
{
    string result = string.Empty;
    for (int i = 0; i < 13; i++)//逐字節變為16進制字符，以%隔開
    {
        result += Convert.ToString(bArr[i], 16).ToUpper().PadLeft(2, '0') + " ";
    }
    return result;
}

發送數據

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

續補：串口數據接受不完整處理方法

        /// <summary>
        /// 監聽串口數據線程
        /// </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); 

                        //延時等待數據接收完畢。
                        while ((byteNumber < com.BytesToRead) && (com.BytesToRead < 4800))
                        {
                            byteNumber = com.BytesToRead;
                            Thread.Sleep(20);
                        } 

                        int n = com.BytesToRead; //記錄下緩沖區的字節個數 
                        byte[] buf = new byte[n]; //聲明一個臨時數組存儲當前來的串口數據 
                        com.Read(buf, 0, n); //讀取緩沖數據到buf中，同時將這串數據從緩沖區移除 
                        
                        //設置文字顯示
                        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)
            {

            }
        }

 

 

到這里就結束了,網上也有一些測試串口數據的程序,我這也有一個但是不記得在哪里下載的了,如果有需要跟我吱一聲~