串口软件集成
1、串口初始化函数
初始化函数以按键点击函数为起点。需要将各控件的参数幅值给串口各项参数，具体代码如下：
private void button1_Click(object sender, EventArgs e)
        {
           // if(Button_on == 1)
            if (!serialPort1.IsOpen)//如果串口是开
            {
                serialPort1.PortName = comboBox1.Text;
                serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text, 10);
                float f = Convert.ToSingle(comboBox3.Text.Trim());
                if (f == 0)//设置停止位
                    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;
                //设置数据位
                serialPort1.DataBits = Convert.ToInt32(comboBox4.Text.Trim());
                //设置奇偶校验位
                string s = comboBox5.Text.Trim();
                if (s.CompareTo("无") == 0)
                    serialPort1.Parity = Parity.None;
                else if (s.CompareTo("奇校验") == 0)
                    serialPort1.Parity = Parity.Odd;
                else if (s.CompareTo("偶校验") == 0)
                    serialPort1.Parity = Parity.Even;
                else
                    serialPort1.Parity = Parity.None;
                try
                {
                    serialPort1.Open();     //打开串口
                    button1.Text = "关闭串口";
                    comboBox1.Enabled = false;//关闭使能
                    comboBox2.Enabled = false;
                    comboBox3.Enabled = false;
                    comboBox4.Enabled = false;
                    comboBox5.Enabled = false;
                }
                catch
                {
                    MessageBox.Show("串口打开失败！");
                }
            }
            else//如果串口是打开的则将其关闭
            {
                serialPort1.Close();
                button1.Text = "打开串口";
                comboBox1.Enabled = true;//使能配置
                comboBox2.Enabled = true;
                comboBox3.Enabled = true;
                comboBox4.Enabled = true;
                comboBox5.Enabled = true;
            }          
        }


2、串口写函数
写函数主要用于发送数据，用到serialPort.write函数
本例以鼠标点击按键触发写函数，代码如下：

private void button_send_Click(object sender, EventArgs e)
        {//发送数据
            if(serialPort1.IsOpen)
            {//如果串口开启
                if (textBox2.Text.Trim() != "")//如果框内不为空则
                {
                    serialPort1.Write(textBox2.Text.Trim());//写数据
                }
                else
                {
                    MessageBox.Show("发送框没有数据");
                }
            }
            else
            {
                MessageBox.Show("串口未打开");
            }
        }

3、串口读函数
串口读函数主要用于读取串口缓冲区的数据。
此处用到post_DataReceived事件
这里增减了两种显示方式：
1十六进制显示    2字符串显示
private void post_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            
            if (!radioButton1.Checked)
            {
                string str = serialPort1.ReadExisting();//字符串方式读
                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) + "  ");
            }
        }