Interfacing Embedded System With Computer Software Using Vb1

7/30/2019 Interfacing Embedded System With Computer Software Using Vb1

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Interfacing Embedded System with

Computer Software Using VB.net

Presented by :- Sulaiman Salim AL Habsi


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Why VB.NET ????????

New implementation of classic VB on .NET

framework .

Object Oriented Programming Language .

Very close to human language .

Not case sensitive .

Easier Graphical User Interface (GUI).


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Data types and Declaration

int Integer

string String

double

Double char Char

bool Boolean

Dim [variable name] As [data type]. Do not use semicolon !!!!! .


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Function and Loops

While loop

Do While (condition)

- statement

Loop

Do Until (condition)

-statement

loop


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Functions and loops

For loop

For [variable name]=init To [max] -statement

Next

For each (google)


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Function

Public Sub functionName(ByReffAs Integer)

End Sub


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Function

Public Function R_function(ByVal h As String) As String

Return "String"

End Function


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DLL

Use ready code

Intermediate language for all .NET frame work

Add to the project Import to the class


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URL request

URL request are used request a html

document from a web server .

If you are behind a web proxy youll need to

but proxy setting .


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How to make a URL requist

Imports System.Net

Imports System.IO

New webClient

New stream = webClient.OpenRead

New StreamReader(stream)

While Not isr.EndOfStream

str += isr.ReadLine()

End While


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Proxy setting

New NetworkCredential(username", pass",

domain")

New WebProxy(proxyserver", port)

proxy.Credentials = cr

Dim stoper As Boolean = True

proxy.BypassProxyOnLocal = True


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Thread

Thread: making the program doing more thanone task at the same time .

Some object already have threads

VB does not allow accessing thread form another thread . We need an other solution

Timer is on of the solution of the problem

If your thread task is done then you cant start

the thread again


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How to create a thread

Imports Threading outside the class

Dim myThread As Thread

myThread = new Thead(addressOfmyInfitTask)

myThread.start()


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Example

Make a http request to Google web site .

1- display full html in a text field

2- display the head tag only . 3- make a other button to request SQU web

site in the same time .

4- modify the code in 3 so you use lessredundancy .


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Serial communication in ES

Atmel AVR microcontrollers


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Serial communication

Send bits in serial

Less wiring and asynchronous and synchronous

Baud rate is number of bits per second

=(F_CPU/16*baud)-1

voltage level in microcontroller is different

from computer (use Max232).


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RCX: Data receive completeUDRE:Ready for transition

U2X : double the transition baud rate

RXEN: Enable Receive Data

TXEN: Enable Transmit Data

UCPOL: Using the USART as synchronous or a synchronous

UCSZ0/1:select the Size Of data(5,6,7,8)bits

USBS: number of stop bit

UPM0/1:parity (none, odd , even)UMSEL /URSEL : put to Zero.

UBRR : set baud rate

UDR : transmit receive data


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Serial port object

Imports system.io.ports

Define connection configurations

Using with

Read the buffer using timer

Change the ports form the system

Some GSM modems use virtual serial port

Using AT command to control GSM Modem You can put some of the configuration during the

creation of the object.


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Create and configure serial port

Imports System.IO.Ports

Dim serialport As new SerialPort

With serialport

.PortName = COM1"

.BaudRate = 9600 .StopBits = StopBits.One

.DataBits = 8

.Parity = Parity.None

.Open()

End With


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example

Write a program in VB.net that receive a

message (number from a web server and

display it in a BCD 7 segments in the testing

board) use the URL(http://172.22.13.12/embedded)


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If you are enemy of Proprietary software

You can use shell script to access your computer hardware and web servers .

You can user javacomm library to access you computerhard ware and make URL request .

You can follow the new project www.mono-project.com/.

Or any other Opensource languages like python .

You can use a GSM/GPRS modem to direct access the

internet with out the need for computer. Smart phone already have application to handle web

events and send notifications
http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/http://www.mono-project.com/

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Interfacing Embedded System With Computer Software Using Vb1