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C serialport configuration and attribute understanding

2022-07-19 10:36:00 【InfoQ】

Preface

SerilPort It is a control for serial port data communication , How to configure bishop Bo today SerialPort End to end communication . It's a little simple , If you are interested, you can finish it patiently , I can teach everyone VS2019 The shortcut method and the method of using code to configure , Don't spray if you don't like it hahaha , It's not easy to create .

Once a day , Prevent puppy love

1 Use Vs2019 A shortcut to SerialPort To configure

1.1 New form application file , establish Serialport Control

Be careful ： If you find that there is no in your toolbox Serialport This control , Maybe you created the wrong form application , This form application is （.NET framework） The file of ,

1.2 Recognize the properties that need to be configured

BaseStream  obtain SerialPort  The foundation of objects Stream  object 
BaudRate  Gets or sets the serial baud rate 
BreakState  Gets or sets the interrupt signal status 
BytesToRead  Gets the number of bytes of data in the receive buffer 
BytesToWrite  Get the number of bytes of data in the send buffer 
CDHolding  Get the status of the carrier detection line of the port 
CtsHolding  obtain “ Can send ” The state of the line 
DataBits  Gets or sets the standard data bit length for each byte 
DiscardNull  Gets or sets a value , The value indicates Null  Whether bytes are ignored when transmitted between port and receive buffer 
DsrHolding  Get data settings ready (DSR)  The state of the signal 
DtrEnable  Gets or sets a value , This value enables data terminal readiness during serial communication (DTR)  The signal 
Encoding  Gets or sets the byte encoding of text conversion before and after transmission 
Handshake    Get or set the handshake protocol for serial port data transmission    
IsOpen    Get a value , The value indicates  SerialPort  The open or closed state of the object    
NewLine    Gets or sets the value used to interpret  ReadLine( ) and WriteLine( ) The value at the end of the method call    
Parity    Gets or sets the parity check protocol 
ParityReplace    Get or set a byte , This byte replaces invalid bytes in the data stream when a parity error occurs  
PortName    Gets or sets the communication port , Including but not limited to all available  COM  port    
ReadBufferSize    Get or set  SerialPort  Enter the size of the buffer    
ReadTimeout    Gets or sets the number of milliseconds before a timeout occurs when a read operation is not completed    
ReceivedBytesThreshold    Get or set  
DataReceived  The number of bytes in the internal input buffer before the event    
RtsEnable    Gets or sets a value , This value indicates whether request sending is enabled in serial communication  (RTS)  The signal     
StopBits    Gets or sets the standard stop bit per byte 
WriteBufferSize  Gets or sets the size of the serial port output buffer    
WriteTimeout    Gets or sets the number of milliseconds before a timeout occurs when a write operation is not completed 
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Configure according to your needs

1.3 Serialport Specific configuration

1.3.1 Find the required port number , Bloggers COM3

1.3.2 Configure baud rate , Data bits , Port number

1.3.3 Make a simple opening , You need to send and receive the next blog post .

2 Use code to align SerialPort To configure

2.1 First write an active serial port scan , Realize automatic scanning of port number

2.1.1 Drag a window like this

2.1.2 Double click serial port scanning , Write a function .

private void SearchAndAddSerialToComboBox(object sender, EventArgs e)
 {
 string Buffer;
 comboBox1.Items.Clear(); // Records scanned before the beginning of the Qing Dynasty 
 for (int i = 0; i < 20; i++)
 {
 try
 {
 Buffer = &quot;COM&quot; + i.ToString(); // get COM1-20
 serialPort1.PortName = Buffer; // obtain COM Information 
 serialPort1.Open(); // Open the serial port 
 comboBox1.Items.Add(Buffer);
 comboBox1.Text = Buffer; // Add serial port to get recordset 
 serialPort1.Close(); // Turn off the serial port 
 }
 catch { }
 }
 }
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Serial port automatic scanning effect

2.1.3 To baud rate , Data bits , Check bit , Stop bit configuration , First in ComboBox Add options

Others are the same as this step , Xiaobian gives you the configuration value of Xiaobian ：

 Baud rate ：
110
300
600
1200
2400
4800
9600
14400
19200
38400
56000
57600
115200
 Data bits ：
6
7
8
 Check bit ：
None
 Odd check 
 Even check 
Mark
 Space check 
 Stop bit ：
1
1.5
2

2.1.4 double-click “ open ” Button Write the corresponding configuration in the function , To configure .

2.1.5 The code is as follows

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Serilport
{
 public partial class Form1 : Form
 {
 public Form1()
 {
 InitializeComponent();
 
 }
 private void SearchAndAddSerialToComboBox(object sender, EventArgs e)
 {
 string Buffer;
 comboBox1.Items.Clear(); // Records scanned before the beginning of the Qing Dynasty 
 for (int i = 0; i < 20; i++)
 {
 try
 {
 Buffer = &quot;COM&quot; + i.ToString(); // get COM1-20
 serialPort1.PortName = Buffer; // obtain COM Information 
 serialPort1.Open(); // Open the serial port 
 comboBox1.Items.Add(Buffer);
 comboBox1.Text = Buffer; // Add serial port to get recordset 
 serialPort1.Close(); // Turn off the serial port 
 }
 catch { }
 }
 }

 private void button4_Click(object sender, EventArgs e)
 {
 try
 {
 serialPort1.PortName = comboBox1.Text;
 serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text, 10);
 serialPort1.DataBits = Convert.ToInt32(comboBox3.Text, 10);
 if (comboBox4.Text == &quot;None&quot;) { serialPort1.Parity = Parity.None; }
 else if (comboBox4.Text == &quot; Odd check &quot;) { serialPort1.Parity = Parity.Odd; }
 else if (comboBox4.Text == &quot; Even check &quot;) { serialPort1.Parity = Parity.Even; }
 else if (comboBox4.Text == &quot;Mark&quot;) { serialPort1.Parity = Parity.Mark; }
 else if (comboBox4.Text == &quot; Space check &quot;) { serialPort1.Parity = Parity.Space; }
 if (comboBox5.Text == &quot;1&quot;)
 {
 serialPort1.StopBits = StopBits.One;
 }
 else if (comboBox5.Text == &quot;1.5&quot;)
 {
 serialPort1.StopBits = StopBits.OnePointFive;
 }
 else if (comboBox5.Text == &quot;1.5&quot;)
 {
 serialPort1.StopBits = StopBits.Two;
 }
 //serialPort1.ReadTimeout(2000);
 serialPort1.Open();
 button2.Enabled = false;// The open serial port button is not available 
 //button3.Enabled = true;// Turn off the serial port 
 }
 catch
 {
 MessageBox.Show(&quot; Port error , Please check the serial port &quot;, &quot; error &quot;);
 }
 }
 }
}

2.1.6 The effect is as follows

summary

SerialPort Is a serial transmission of a very convenient control , It is a good control for those who are engaged in upper computer testing , Many people who do embedded development , Most of their interfaces use C# Written , It is inevitable to use this control , If you need to know SerialPort Send and receive , Please follow the blogger's next article . It's not easy to create , give the thumbs-up , Focus on , If you have any questions, please comment , thank you .