C#实现简单串口通信的示例详解
作者:SongYuLong的博客
这篇文章主要为大家详细介绍了C#实现串口通信的相关知识,文中示例代码介绍的非常详细,具有一定的学习价值,感兴趣的小伙伴们可以跟随小编一起了解一下
串口通信
C# 串口通信主要操作:
命名空间:using System.IO.Ports;
获取端口:string[] ports = System.IO.Ports.SerialPort.GetPortNames();
设置端口名:serialPort1.PortName = “COM1”; // 字符串
设置波特率:serialPort1.BaudRate = 115200;// int.Parse(“115200”);
设置数据位:serialPort1.DataBits = 1; // int.Parse(“1”);
设置停止位:serialPort1.StopBits = StopBits.One;
- StopBits.One:停止位1
- StopBits.OnePointFive:停止位1.5
- StopBits.Two:停止位2
设置校验位:serialPort1.Parity = Parity.None;
- Parity.None:无
- Parity.Even:奇校验
- Parity.Odd:偶校验
打开串口:serialPort1.Open();
关闭串口:serialPort1.Close();
可读字节:serialPort1.BytesToRead;
读取数据:serialPort1.Read(buffer, 0, len);
写入数据:serialPort1.Write(buffer);
接收事件: XXX_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e);
示例代码
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; using System.IO.Ports; namespace serial_tools { public partial class Form1 : Form { String serialPortName; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { string[] ports = System.IO.Ports.SerialPort.GetPortNames(); // 获取本机可用串口端口 comboBoxPort.Items.AddRange(ports); comboBoxPort.SelectedIndex = comboBoxPort.Items.Count > 0 ? 0 : -1; // 有可用端口显示第一个 comboBoxBaudrate.Text = "115200"; // 默认波特率 comboBoxDataBits.Text = "8"; // 默认数据位:8 comboBoxStopbit.Text = "1"; // 默认停止位:1 comboBoxCheck.Text = "无"; // 默认无校验 } /// <summary> /// 重写 系统消息函数 /// </summary> /// <param name="m"></param> protected override void WndProc(ref Message m) { base.WndProc(ref m); } /// <summary> /// 串口数据接收 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { int len = serialPort1.BytesToRead; // 获取可读字节数 byte[] buff = new byte[len]; // 创建缓存数据数组 serialPort1.Read(buff, 0, len); // 把数据读取到buff数组 string str = Encoding.Default.GetString(buff); // Byte值转ASCII字符串 Invoke((new Action(() => { if (checkBoxHexShow.Checked) { textBoxRecv.AppendText(byteToHexStr(buff)); } else { textBoxRecv.AppendText(str); } }))); // 对话框追加显示数据 } public static string byteToHexStr(byte[] bytes) { string hexStr = ""; try { if (bytes != null) { for (int i = 0; i < bytes.Length; i++) { hexStr += bytes[i].ToString("X2"); hexStr += " "; // 两个Hex数值以空格隔开 } } return hexStr; } catch (Exception) { return hexStr; } } /// <summary> /// 打开关闭串口 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void buttonPortOnOff_Click(object sender, EventArgs e) { if (buttonPortOnOff.Text == "打开串口") { try { serialPort1.PortName = comboBoxPort.Text; // 获取选择的串口端口 serialPortName = comboBoxPort.Text; serialPort1.BaudRate = int.Parse(comboBoxBaudrate.Text); // 获取选择的波特率 serialPort1.DataBits = int.Parse(comboBoxDataBits.Text); // 获取选择的数据位 // 设置停止位 if (comboBoxStopbit.Text == "1") { serialPort1.StopBits = StopBits.One; } else if (comboBoxStopbit.Text == "1.5") { serialPort1.StopBits = StopBits.OnePointFive; } else if (comboBoxStopbit.Text == "2") { serialPort1.StopBits = StopBits.Two; } // 设置奇偶校验 if (comboBoxCheck.Text == "无") { serialPort1.Parity = Parity.None; } else if (comboBoxCheck.Text == "奇校验") { serialPort1.Parity = Parity.Even; } else if (comboBoxCheck.Text == "偶校验") { serialPort1.Parity = Parity.Odd; } // 打开串口 serialPort1.Open(); buttonPortOnOff.Text = "关闭串口"; } catch (Exception ex) { MessageBox.Show("串口打开失败"+ ex.ToString(), "警告", MessageBoxButtons.OK, MessageBoxIcon.Error); } } else { try { serialPort1.Close(); } catch (Exception ex) { } buttonPortOnOff.Text = "打开串口"; } } /// <summary> /// 清空接收数据 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void buttonClearRecv_Click(object sender, EventArgs e) { textBoxRecv.Clear(); } /// <summary> /// 发送数据 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void buttonSendData_Click(object sender, EventArgs e) { String Str = textBoxSend.Text.ToString(); // 获取发送文本框里的数据 try { if (Str.Length > 0) { serialPort1.Write(Str); // 串口发送数据 } } catch (Exception) { } } /// <summary> /// 清除发送数据 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void buttonClearSend_Click(object sender, EventArgs e) { textBoxSend.Clear(); } private void comboBoxPort_SelectedIndexChanged(object sender, EventArgs e) { } private void comboBoxPort_MouseClick(object sender, MouseEventArgs e) { } } }
窗体界面设计
运行效果
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