03-08-2011, 10:38 AM
Abstract
As the World-Wide Web (WWW) continues to
evolve, it is clear that its underlying technologies are useful
for much more than just browsing the web. Web browsers
have become the de facto standard user interface for a
variety of applications including embedded real time
applications such as Remote Data Acquisition System. This
brings in a need for web services being deployed on various
embedded processors such as Advanced RISC Machine
(ARM) in real time context.
The main aim of the project is to develop an embedded web
server using ARM9 processor and a Real Time Operating
System, μC/OS-II. μC/OS-II is used to monitor all the tasks
of the web server. Embedded C language has been used for
the software implementation of the embedded web server.
The web pages which are required for the web server were
developed using HTML. The μC/OS-II was successfully
ported on the ARM and the web server application is
configured with the operating system (μC/OS-II). Both, the
operating system and the web server application are ported
on the ARM9. This embedded web server is tested for its
working, using a data acquisition web application hosted
over a network of PC's.
This embedded web server which is developed by using
Embedded C language can be beneficial for mission critical
applications, remote data acquisition systems, ATM
network and more. The developed web server accelerates
business performance by automating and orchestrating
processes across total enterprises. Enterprise users can
collaborate more flexibly and cost-effectively with business
and trading partners.
Index Terms— Embedded Web Server, μC/OS-II, ARM,
Web
I. INTRODUCTION
A web server is a system which hosts a web site and
provides services for any requesting clients. The generalpurpose
web servers compose of an operating system, the
web pages or the application and a huge amount of
memory and sometimes a special hardware.
Fig 1. Client - Server Architecture
Fig 2. Embedded Web Server Architecture
Fig 1. shows a typical client-server architecture where,
the client accesses the server through the LAN router and
the Internet. Whenever, the client wants to access the
sever, it sends the request to the server, this request is
taken by the router, which is connected to the Internet.
The web processes the request made and finally connects
to the desired web server, access the requested data and
sends the data to the client.
Embedded Web Servers: General web servers, which
were developed for general-purpose computers such as
NT servers or Unix and Linux workstations, typically
require megabytes of memory, a fast processor, a
preemptive multitasking operating system, and other
resources. A web server can be embedded in a device to
provide remote access to the device from a web browser.
The embedded system can be utilized to serve the
embedded web documents, including static and dynamic
information about embedded systems, to web browsers.
This type of web server is called an Embedded Web
Server.
An embedded web server is a microcontroller that
contains an Internet software suite as well as application
code for monitoring and controlling systems. Embedded
web servers are integral part of an embedded network and
paves way for faster time to market products.
Fig 1. Shows the general-purpose web server where, it
requires a huge amount of memory, special hardware,
software and an operating system. An embedded web
server can replace the Fig 1., which is a single hardware
with an RTOS and the application. Fig 2. Shows typical
embedded web server architecture. The web server is the
board that has the application and the RTOS
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