C#學習與上位機開發之串口通信模塊介紹

using System.IO;
using System.IO.Ports;

方 法 名 稱

說　　明

private void button1_Click(object sender, EventArgs e)
        {
           // if(Button_on == 1)
            if (!serialPort1.IsOpen)//如果串口是開
            {
                serialPort1.PortName = comboBox1.Text;
                serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text, 10);
                float f = Convert.ToSingle(comboBox3.Text.Trim());
                if (f == 0)//設置停止位
                    serialPort1.StopBits = StopBits.None;
                else if (f == 1.5)
                    serialPort1.StopBits = StopBits.OnePointFive;
                else if (f == 1)
                    serialPort1.StopBits = StopBits.One;
                else if (f == 2)
                    serialPort1.StopBits = StopBits.Two;
                else
                    serialPort1.StopBits = StopBits.One;
                //設置數據位
                serialPort1.DataBits = Convert.ToInt32(comboBox4.Text.Trim());
                //設置奇偶校驗位
                string s = comboBox5.Text.Trim();
                if (s.CompareTo("無") == 0)
                    serialPort1.Parity = Parity.None;
                else if (s.CompareTo("奇校驗") == 0)
                    serialPort1.Parity = Parity.Odd;
                else if (s.CompareTo("偶校驗") == 0)
                    serialPort1.Parity = Parity.Even;
                else
                    serialPort1.Parity = Parity.None;
                try
                {
                    serialPort1.Open();     //打開串口
                    button1.Text = "關閉串口";
                    comboBox1.Enabled = false;//關閉使能
                    comboBox2.Enabled = false;
                    comboBox3.Enabled = false;
                    comboBox4.Enabled = false;
                    comboBox5.Enabled = false;
                }
                catch
                {
                    MessageBox.Show("串口打開失敗！");
                }
            }
            else//如果串口是打開的則將其關閉
            {
                serialPort1.Close();
                button1.Text = "打開串口";
                comboBox1.Enabled = true;//使能配置
                comboBox2.Enabled = true;
                comboBox3.Enabled = true;
                comboBox4.Enabled = true;
                comboBox5.Enabled = true;
            }          

        }

private void button_send_Click(object sender, EventArgs e)
        {//發送數據
            if(serialPort1.IsOpen)
            {//如果串口開啟
                if (textBox2.Text.Trim() != "")//如果框內不為空則
                {
                    serialPort1.Write(textBox2.Text.Trim());//寫數據
                }
                else
                {
                    MessageBox.Show("發送框沒有數據");
                }
            }
            else
            {
                MessageBox.Show("串口未打開");
            }
        }

private void post_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
           
            if (!radioButton1.Checked)
            {
                string str = serialPort1.ReadExisting();//字元串方式讀
                textBox_receive.AppendText(str);

            }
            else
            {
                byte data;
                data = (byte)serialPort1.ReadByte();
                string str = Convert.ToString(data, 16).ToUpper();//
                textBox_receive.AppendText("0x" + (str.Length == 1 ? "0" + str : str) + "  ");

            }
        }