Ở bài trước mình đã giới thiệu cách đọc tín hiệu MPU6050 dùng PIC CCS-C, bây giờ chúng ta sẽ truyền tín hiệu đó lên máy tính theo chuẩn RS232 vẽ đồ thị góc quay theo thời gian. Giao diện được lập trình bằng C# Các thông số của giao diện
Code xử lý sự kiện
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
}
