串口通讯

来源：互联网发布：php 16进制编辑：程序博客网时间：2024/04/30 14:56

最简单串口通讯 http://blog.sina.com.cn/s/blog_775102c6010159k5.html

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
namespace 串口调试
{
public partial class Form1 : Form
{
SerialPort sp = null;//声明一个串口类
bool isOpen = false;//打开串口标志位
bool isSetProperty = false;//属性设置标志位
bool isHex = false;//十六进制显示标志位
public Form1()
{
InitializeComponent();//窗口初始化，net 自动生成
}
private void Form1_Load(object sender, EventArgs e)
{
this.MaximumSize = this.Size;
this.MinimumSize = this.Size;
this.MaximizeBox = false;
for (int i = 0; i < 10; i++)//最大支持到串口 10，可根据自己需求增加
{
cbxCOMPort.Items.Add("COM" + (i + 1).ToString());
}
cbxCOMPort.SelectedIndex = 0;
//列出常用的波特率
cbxBaudRate.Items.Add("1200");
cbxBaudRate.Items.Add("2400");
cbxBaudRate.Items.Add("4800");
cbxBaudRate.Items.Add("9600");
cbxBaudRate.Items.Add("19200");
cbxBaudRate.Items.Add("38400");

cbxBaudRate.Items.Add("43000");
cbxBaudRate.Items.Add("56000");
cbxBaudRate.Items.Add("57600");
cbxBaudRate.Items.Add("115200");
cbxBaudRate.SelectedIndex = 5;
//列出停止位
cbxStopBits.Items.Add("0");
cbxStopBits.Items.Add("1");
cbxStopBits.Items.Add("1.5");
cbxStopBits.Items.Add("2");
cbxStopBits.SelectedIndex = 1;
//列出数据位
cbxDataBits.Items.Add("8");
cbxDataBits.Items.Add("7");
cbxDataBits.Items.Add("6");
cbxDataBits.Items.Add("5");
cbxDataBits.SelectedIndex = 0;
//列出奇偶校验位
cbxParity.Items.Add("无");
cbxParity.Items.Add("奇校验");
cbxParity.Items.Add("偶校验");
cbxParity.SelectedIndex = 0;
//默认为 Char 显示
rbnChar.Checked = true;
}
private void btnCheckCOM_Click(object sender, EventArgs e)//检测哪些串口可用
{
bool comExistence = false;//有可用串口标志位
cbxCOMPort.Items.Clear(); //清除当前串口号中的所有串口名称
for (int i = 0; i < 10; i++)
{
try
{
SerialPort sp = new SerialPort("COM" + (i + 1).ToString());
sp.Open();
sp.Close();
cbxCOMPort.Items.Add("COM" + (i + 1).ToString());
comExistence = true;
}
catch (Exception)
{
continue;

}
}
if (comExistence)
{
cbxCOMPort.SelectedIndex = 0;//使 ListBox 显示第 1 个添加的索引
}
else
{
MessageBox.Show("没有找到可用串口！", "错误提示");
}
}
private bool CheckPortSetting()//检查串口是否设置
{
if (cbxCOMPort.Text.Trim() == "") return false;
if (cbxBaudRate.Text.Trim() == "") return false;
if (cbxDataBits.Text.Trim() == "") return false;
if (cbxParity.Text.Trim() == "") return false;
if (cbxStopBits.Text.Trim() == "") return false;
return true;
}
private bool CheckSendData()
{
if (tbxSendData.Text.Trim() == "") return false;
return true;
}
private void SetPortProperty()//设置串口的属性
{
sp = new SerialPort();
sp.PortName = cbxCOMPort.Text.Trim();//设置串口名
sp.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());//设置串口的波特率
float f = Convert.ToSingle(cbxStopBits.Text.Trim());//设置停止位
if (f == 0)
{
sp.StopBits = StopBits.None;
}
else if (f == 1.5)
{

sp.StopBits = StopBits.OnePointFive;
}
else if (f == 1)
{
sp.StopBits = StopBits.One;
}
else if (f == 2)
{
sp.StopBits = StopBits.Two;
}
else
{
sp.StopBits = StopBits.One;
}
sp.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim());//设置数据位
string s = cbxParity.Text.Trim(); //设置奇偶校验位
if (s.CompareTo("无") == 0)
{
sp.Parity = Parity.None;
}
else if (s.CompareTo("奇校验") == 0)
{
sp.Parity = Parity.Odd;
}
else if (s.CompareTo("偶校验") == 0)
{
sp.Parity = Parity.Even;
}
else
{
sp.Parity = Parity.None;
}
sp.ReadTimeout = -1;//设置超时读取时间
sp.RtsEnable = true;
//定义 DataReceived 事件，当串口收到数据后触发事件
sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
if (rbnHex.Checked)
{

isHex = true;
}
else
{
isHex = false;
}
}
private void btnSend_Click(object sender, EventArgs e)//发送串口数据
{
if (isOpen)//写串口数据
{
try
{
sp.WriteLine(tbxSendData.Text);
}
catch (Exception)
{
MessageBox.Show("发送数据时发生错误！", "错误提示");
return;
}
}
else
{
MessageBox.Show("串口未打开！", "错误提示");
return;
}
if (!CheckSendData())//检测要发送的数据
{
MessageBox.Show("请输入要发送的数据！", "错误提示");
return;
}
}
private void btnOpenCom_Click(object sender, EventArgs e)
{
if (isOpen == false)
{
if (!CheckPortSetting())//检测串口设置
{
MessageBox.Show("串口未设置！", "错误提示");
return;
}

if (!isSetProperty)//串口未设置则设置串口
{
SetPortProperty();
isSetProperty = true;
}
try//打开串口
{
sp.Open();
isOpen = true;
btnOpenCom.Text = "关闭串口";
//串口打开后则相关的串口设置按钮便不可再用
cbxCOMPort.Enabled = false;
cbxBaudRate.Enabled = false;
cbxDataBits.Enabled = false;
cbxParity.Enabled = false;
cbxStopBits.Enabled = false;
rbnChar.Enabled = false;
rbnHex.Enabled = false;
}
catch (Exception)
{
//打开串口失败后，相应标志位取消
isSetProperty = false;
isOpen = false;
MessageBox.Show("串口无效或已被占用！", "错误提示");
}
}
else
{
try//打开串口
{
sp.Close();
isOpen = false;
isSetProperty = false;
btnOpenCom.Text = "打开串口";
//关闭串口后，串口设置选项便可以继续使用
cbxCOMPort.Enabled = true;
cbxBaudRate.Enabled = true;
cbxDataBits.Enabled = true;
cbxParity.Enabled = true;
cbxStopBits.Enabled = true;
rbnChar.Enabled = true;

rbnHex.Enabled = true;
}
catch (Exception)
{
lblStatus.Text = "关闭串口时发生错误";
}
}
}
private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
System.Threading.Thread.Sleep(100);//延时 100ms 等待接收完数据
//this.Invoke 就是跨线程访问 ui 的方法，也是本文的范例
this.Invoke((EventHandler)(delegate
{
if (isHex == false)
{
tbxRecvData.Text += sp.ReadLine();
}
else
{
Byte[] ReceivedData = new Byte[sp.BytesToRead]; //创建接收字节数组
sp.Read(ReceivedData, 0, ReceivedData.Length); //读取所接收到的数据
String RecvDataText = null;
for (int i = 0; i < ReceivedData.Length - 1; i++)
{
RecvDataText += ("0x" + ReceivedData[i].ToString("X2") + " ");
}
tbxRecvData.Text += RecvDataText;
}
sp.DiscardInBuffer();//丢弃接收缓冲区数据
}));
}
private void btnCleanData_Click(object sender, EventArgs e)
{
tbxRecvData.Text = "";
tbxSendData.Text = "";
}

private void label6_Click(object sender, EventArgs e)
{

}
}

}

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