Truyền tín hiệu lên máy tính theo chuẩn RS232

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;
// Khai bao thu vien Seiral Ports
using System.Windows;
using System.IO;
using System.IO.Ports;
using System.Xml;
using ZedGraph;

namespace Giao_tiep_RS232
{
    public partial class Form1 : Form
    {
        // Khoi tao doi tuong Serial Ports P
        SerialPort P = new SerialPort();
        Boolean PortOpen = false;
        string InputData = string.Empty; // khai bao buffer dem kieu string
        string temp = string.Empty;
        string lines = "rn Gryo_Xt Gryo_Yt Gryo_Zt Acce_Xt Acce_Yt Acce_Zt rn";
        StreamWriter file = new StreamWriter("E:\_MPU6050_.txt");
        delegate void SetTextCallBack(String Text); // Khai bao thu tuc delegate
        int tickStart = 0;
        float Ox;
        public Form1()
        {
            InitializeComponent();
            string[] ports = SerialPort.GetPortNames();// Liet ke cac ports tim thay
            cmbPorts.Items.AddRange(ports);// Them cac cong tim thay vao Combobox
            P.ReadTimeout = 1000;
            P.DataReceived += new SerialDataReceivedEventHandler(DataReceive);
            // Khoi tao Baudrate
            string[] Baudrate = {"1200","2400","4800","9600","19200","38400","57600","115200" };
            cmbBaudRate.Items.AddRange(Baudrate);
            //Khoi tao data bits
            string[] Databits = {"6","7","8"};
            cmbDatabits.Items.AddRange(Databits);
            // Khoi tao Parity bit
            string[] Paritybits = {"None","Odd","Even"};
            cmbParitybits.Items.AddRange(Paritybits);
            // Khoi tao Stop bit
            string[] Stopbits = {"1","1.5","2"};
            cmbStopbits.Items.AddRange(Stopbits);
        }

        // Xu ly su kien khi lua chon cac thong so cua he thong

        private void cmbPorts_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (P.IsOpen) P.Close();
            P.PortName = cmbPorts.SelectedItem.ToString();
        }

        private void cmbBaudRate_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (P.IsOpen) P.Close();
            P.BaudRate = Convert.ToInt32(cmbBaudRate.Text); // Chuyen kieu String Sang kieu so nguyen
        }

        private void cmbDatabits_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (P.IsOpen) P.Close();
            P.DataBits = Convert.ToInt32(cmbDatabits.Text);
        }

        private void cmbParitybits_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (P.IsOpen) P.Close();
            switch (cmbParitybits.SelectedItem.ToString())
            {
                case "Odd":
                    P.Parity = Parity.Odd;
                    break;
                case "None":
                    P.Parity = Parity.None;
                    break;
                case "Even":
                    P.Parity = Parity.Even;
                    break;
            }
        }

        private void cmbStopbits_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (P.IsOpen) P.Close();
            switch (cmbStopbits.SelectedItem.ToString())
            {
                case "1":
                    P.StopBits = StopBits.One;
                    break;
                case "1.5":
                    P.StopBits = StopBits.OnePointFive;
                    break;
                case "2":
                    P.StopBits = StopBits.Two;
                    break;
            }
        }

    // Xu ly truyen nhan du lieu qua cong COM
        private void DataReceive(object sender, SerialDataReceivedEventArgs e)
        {
            if (PortOpen)
            {
                // Tach chuoi gia tri
                InputData = P.ReadLine();
                for (int i = 0; i < InputData.Length; i++)
                {
                    // Nen sua lai thanh cau truc switch case: // Tien Anh 24/2/2014
                    if (InputData[i] == 'a')
                    {
                        SetTextOx(temp);
                        lines += (temp + "t");
                        //Ox = Convert.ToDouble(temp);
                        Ox = float.Parse(temp);
                        temp = string.Empty;
                        continue;
                    }
                    else
                        if (InputData[i] == 'y')
                        {
                            SetTextOy(temp);
                            lines += (temp + "t");
                            temp = string.Empty;
                            continue;
                        }
                        else
                            if (InputData[i] == 'z')
                            {
                                SetTextOz(temp);
                                lines += (temp + "trn");
                                file.WriteLine(lines);
                                lines = string.Empty;
                                temp = string.Empty;
                                continue;
                            }
                    temp += InputData[i];
                }
            }
        }

        // Ham SetText
        private void SetText(string text)
        {
            if (this.txtKetqua.InvokeRequired)
            {
                SetTextCallBack d = new SetTextCallBack(SetText);// Khoi tao 1 delegate goi den SetText
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {//this.txtKetqua.Text += text;
                this.txtKetqua.Clear();
                this.txtKetqua.Text = text; // Tu dong Refresh man hinh
            }
        }
        // Ham SetTextADC
        private void SetTextADC(string text)
        {
            if (this.txtKetqua.InvokeRequired)
            {
                SetTextCallBack d = new SetTextCallBack(SetTextADC);// Khoi tao 1 delegate goi den SetText
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {//this.txtKetqua.Text += text;
                this.txtKetqua.Clear();
                this.txtKetqua.Text += text; // Tu dong Refresh man hinh
            }
        }

        // Ham SetTextOx
        private void SetTextOx(string text)
        {
            if (this.txtKetqua.InvokeRequired)
            {
                SetTextCallBack d = new SetTextCallBack(SetTextOx);// Khoi tao 1 delegate goi den SetText
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {//this.txtKetqua.Text += text;
                this.txtOx.Clear();
                this.txtOx.Text += text; // Tu dong Refresh man hinh
            }
        }
        // Ham SetTextOy
        private void SetTextOy(string text)
        {
            if (this.txtKetqua.InvokeRequired)
            {
                SetTextCallBack d = new SetTextCallBack(SetTextOy);// Khoi tao 1 delegate goi den SetText
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {//this.txtKetqua.Text += text;
                this.txtOy.Clear();
                this.txtOy.Text += text; // Tu dong Refresh man hinh
            }
        }
        // Ham SetTextOz
        private void SetTextOz(string text)
        {
            if (this.txtKetqua.InvokeRequired)
            {
                SetTextCallBack d = new SetTextCallBack(SetTextOz);// Khoi tao 1 delegate goi den SetText
                this.BeginInvoke(d, new object[] { text });
            }
            else
            {//this.txtKetqua.Text += text;
                this.txtOz.Clear();
                this.txtOz.Text += text; // Tu dong Refresh man hinh
            }
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        // Khoi tao gia tri ban dau khi chay chuong trinh
        private void Form1_Load(object sender, EventArgs e)
        {
            cmbPorts.SelectedIndex = 2;
            cmbBaudRate.SelectedIndex = 4;
            cmbDatabits.SelectedIndex = 2;
            cmbParitybits.SelectedIndex = 0;
            cmbStopbits.SelectedIndex = 0;
            lbStatus.Text = "Port is closed!";
            txtKetqua.Text = "";
            btnDisconnect.Enabled = false;
            // Khoi tao ve do thi
            GraphPane myPane = dothi.GraphPane;
            myPane.Title.Text = "Đọc tín hiệu từ cảm biến MPU 6050";
            myPane.XAxis.Title.Text = "Time , seconds";
            myPane.YAxis.Title.Text = "Góc quay, deg";
            // Save 1200 points.  At 50 ms sample rate, this is one minute
            // The RollingPointPairList is an efficient storage class that always
            // keeps a rolling set of point data without needing to shift any data values
            RollingPointPairList list = new RollingPointPairList(60000);
            // Initially, a curve is added with no data points (list is empty)
            // Color is blue, and there will be no symbols
            LineItem curve = myPane.AddCurve("Roll Angle", list, Color.Blue, SymbolType.None);

            // Sample at 1 ms intervals
            timer1.Interval = 2;
            timer1.Enabled = true;

            // Just manually control the X axis range so it scrolls continuously
            // instead of discrete step-sized jumps
            myPane.XAxis.Scale.Min = 0;
            myPane.XAxis.Scale.Max = 20;
            myPane.XAxis.Scale.MinorStep = 1;
            myPane.XAxis.Scale.MajorStep = 5;
            myPane.YAxis.Scale.Min =-90;
            myPane.YAxis.Scale.Max = 90;
            // Scale the axes
            dothi.AxisChange();

            // Save the beginning time for reference
            tickStart = Environment.TickCount;
            //dudPWM.Text = "0";
        }
        // Xu ly su kien Click nut Connect
        private void btnConnect_Click(object sender, EventArgs e)
        {
            try
            {
                P.Open();
                PortOpen = true;
                btnDisconnect.Enabled = true;
                btnConnect.Enabled = false;
                lbStatus.Text = "Port is connecting with " + cmbPorts.SelectedItem.ToString();
                timer1.Start();
            }
            catch (Exception ex )
            {
                MessageBox.Show("Not connect","Try",MessageBoxButtons.OK,MessageBoxIcon.Error);
            }
            file.WriteLine(lines);
            lines = string.Empty;
        }
        // Xu ly su kien Click nut Disconnect
        private void btnDisconnect_Click(object sender, EventArgs e)
        {
            file.Close();
            P.Close();
            PortOpen = false;
            btnConnect.Enabled = true;
            btnDisconnect.Enabled = false;
            lbStatus.Text = "Port is closed!";

        }
        // Xu ly su kien timer dem xong
        private void timer1_Tick(object sender, EventArgs e)
        {
            // Make sure that the curvelist has at least one curve
            if (dothi.GraphPane.CurveList.Count <= 0)                 return;             // Get the first CurveItem in the graph             LineItem curve = dothi.GraphPane.CurveList[0] as LineItem;             if (curve == null)                 return;             // Get the PointPairList             IPointListEdit list = curve.Points as IPointListEdit;             // If this is null, it means the reference at curve.Points does not             // support IPointListEdit, so we won't be able to modify it             if (list == null)                 return;             // Time is measured in seconds             double time = (Environment.TickCount - tickStart) / 1000.0;             // 3 seconds per cycle             if (txtOx.Text != null)             {                 //double temp;                // temp = double.Parse(txtOx.Text);                 list.Add(time, Ox);             }                          // Keep the X scale at a rolling 30 second interval, with one             // major step between the max X value and the end of the axis             Scale xScale = dothi.GraphPane.XAxis.Scale;             if (time > xScale.Max - xScale.MajorStep)
            {
                xScale.Max = time + xScale.MajorStep;
                xScale.Min = xScale.Max - 20.0;
            }

            // Make sure the Y axis is rescaled to accommodate actual data
            dothi.AxisChange();
            // Force a redraw
            dothi.Invalidate();
        }

    }// End  public partial class Form1 : Form
}