Embedded Network Controller with Web Interface

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Embedded Network Controller with Web Interface

• Bradley University
• Department of Electrical Computer Engineering
• By Ed Siok
• Advisor Dr. Malinowski
• April 27th, 2006

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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Current Status

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Summary

• Embedded Network Controller with Web Interface
• Proof-Of-Concept project showing the use of
  network and internet protocols with embedded
  systems

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Applications

• The internet protocols create an efficient method
  of communication among devices
• Networked devices are being used to control many
  things
• Factory Automation
• Industrial Plants
• Security Surveillance
• Many can be controlled remotely through a web
  interface

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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Current Status

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System Block Diagram
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System Block Diagram

• Microcontroller Board
• M5282 LITE
• 5282 Coldfire Processor
• Complete Development Board
• On board Network Controller

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Internet / Network

• Network Interface
• Input Output All interaction with users
• Addition of XML information output to be used by
  a data collection server

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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Current Status

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Internet Theory

• Internet is merely the interconnection of many
  networks (internetworking)
• Internet Protocol suite defines how information
  is sent over the hardware networks
• Different network hardware / same communication
• Internet works over ethernet, satellite, coaxial
  cables, wireless

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Internet Theory

• Goals of Internet Communication
• Efficiency
• Reliability
• These goals are achieved through the Internet
  Protocol Suite
• Consider the analogy of the internet vs. postal
  mail in the protocol suite

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Internet Protocol Suite
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Internet Protocols
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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Current Status

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TCP/IP Data Flow

• How packet data flows through the TCP/IP stack to
  its final application

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Software

• Main Loop Manages all connections and
  applications

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HTTP Request
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HTTP Function

• Receive TCP Data into Buffer, Call HTTP
• Check if received data includes GET, parse file
  name, parse desired variables
• Generate hash value to decide which file to host
• Store variables in local memory
• Depending upon file name, run functions to update
  web pages desired

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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Current Status

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Methods of Implementation

• 1st method uClinux
• Positives
• Embedded Linux for Microcontrollers
• Contains everything needed for development
• Multithreading Capabilities
• Negatives
• Large footprint, many involved files
• Difficult to troubleshoot and make an environment
  for
• Took 1 month to build a Cross-Compiler and
  toolchain

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Methods of Implementation

• 2nd method OpenTCP stack
• Positives
• Less files to modify and troubleshoot with
• Already had a toolchain and cross-compiler built
• No linux knowledge necessary
• Negatives
• Several bugs in the software to fix
• Missing some parts of the TCP stack IGMP,
  Multicasting
• No file system

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Methods of Implementation

• As an experiment, both methods were using Cygwin,
  a linux environment in Windows and a GNU cross
  compiler
• Metrowerks Codewarrior is expensive (not on my
  laptop)
• Command based compiling using makefiles and the
  GNU C Compiler

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Implemented using OpenTCP
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Topics

• Summary
• Detailed Description
• System Block Diagram
• Software Description
• Internet Theory
• TCP/IP Software
• Methods of Implementation
• Final Status

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Final Status

• Completed
• Simple TCP stack implemented
• DHCP, HTTP, simple CGI applications implemented
• Parsing of URLs and storage of variables
• Dynamic web pages

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Current Status

• Summary
• Internet Protocols are implemented on an embedded
  microcontroller board
• A simple web server is implemented
• Expansion
• The next logical step is to interface with
  sensors and actuators
• Expanding the network software to support IGMP /
  Multicasting

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Any Questions?