Web Server Implementation On DE2

Final Presentation Performed by:

Ariel MoraliNadav Malki

Supervised by:Ina Rivkin

Project GoalsProject Goals

• Assemble a SOPC system, using Nios II processor and an Ethernet Peripheral on Altera’s DE2 board.

• Implement Micrium’s µC OS-II.• Implement Nichestack TCP/IP Stack.• Build a webserver and a website that

demonstrates the system’s abilities.

Project SchemeProject SchemeE

ther

net

Cab

leE

ther

net

Cab

le

The SOPCThe SOPC

• The SOPC includes: Nios II Processor Ethernet Controller External SDRAM Memory UART PLL PIOs (Seven-Segments & LEDs)

Micrium’s µC OS-IIMicrium’s µC OS-II• Mainly for embedded systems• Main features:

• Scalable (5-24KB)• Real time• Pre-emptive multitasking• Priority based• Limited (but big enough) number of tasks

• Supply OS services:• Semaphores and mutexes• Message mailboxes and queues• Timer and memory management

Nichestack TCP/IP stackNichestack TCP/IP stack• NicheStack is an Embedded TCP/IP protocol stack.• NicheStack IPv4 combines small size, extreme portability and

high performance.• NicheStack uses the µC OS Multiprogramming feature.• The DE2 board has a Davicom DM9000A Ethernet controller,

that is not supported by the Nichestack.

The SoftwareThe Software• The software includes:

Micrium’s µC OS-II System Libraries Nichestack TCP/IP Stack Read Only zip File-System Webserver implementation HTML website

• The website demonstrates the system capabilities: Remote controlling the DE2 board Monitoring the board’s status Running several processes in parallel Remote Using the SOPC processor to perform simple

computations

System OverviewSystem Overview

Block DiagramBlock Diagram

The following diagram describes the System:

Quartos Screen ShotQuartos Screen Shot

SOPC Builder Screen ShotSOPC Builder Screen Shot

Ethernet Controller & NichestackEthernet Controller & Nichestack

• The DE2 board has a Davicom DM9000A Ethernet controller.

• In order to use the TCP/IP protocol we planed to use the Nichestack TCP/IP stack.

• DM9000A is not supported by the Nichestack.• A group from Columbia University modified the

original DM9000A Driver to work with the Nichestack.

• We successfully managed to take the driver and use it in our project.

Website & ServerWebsite & Server

Webserver Main ProcessesWebserver Main Processes

1) Webserver main task – Manage the TCP/IP and HTTP protocols.

2) Nichestack tasks.3) Two board Control tasks – Handling the data from

the web site.4) Board status task – Monitors the Board status and

creates an appropriate html page.5) Two “sweep leds” tasks.

Site Main ScreenSite Main Screen

Two Board Control Tasks Running in parallel

Site Board Over-View ScreenSite Board Over-View Screen

Switches Status

Seven Segment Status

What Happens When you press the Button What Happens When you press the Button

1) The Browser ends the form to the webserver. Wireshark screenshot:

2) The webserver detects a POST request. The POST request is being sent when a client needs to send data to the server (according to the HTTP protocol).

Computer IP

DE2IP

HTTPPORT

Form Data

What Happens When you press the Button What Happens When you press the Button Continue…Continue…

2) The webserver process wakes up one of the board control processes, by sending it a message. The message contains information about the operation needed to be performed.

3) The board control process handles the message and performs the requested operation. Then the board control process waits for new message.

Skills AcquiredSkills Acquired• Multiprogramming with µC OS-II Multiprogramming with µC OS-II

creating and maintaining several processescreating and maintaining several processes Synchronization - sending messagesSynchronization - sending messages And more…And more…

• Nichestack on DE2 implemantation.Nichestack on DE2 implemantation.• TCP/IP socket programming with Nichestack.TCP/IP socket programming with Nichestack.

open, close, listen, connect, send, …open, close, listen, connect, send, …• HTTP ProtocolHTTP Protocol

WireShark Helped a lot.WireShark Helped a lot.• Read Only ZIP File System (stores our html pages).Read Only ZIP File System (stores our html pages).• Html programmingHtml programming• And more…………And more…………

Thank YouThank You