A Simple Architecture for Embedded Web Servers

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Edison Mangueira Machado
8 Há anos
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1 MICEI 2003 Arquitectura de Co m putadores Agenda A Simple Architecture for Embedded Web Servers What to expect E mbedded applications usability E mbedded systems paradigm E mbedded Web server architecture requisites 051-type architecture implementation 051-type architecture benchm arks Sum mary Universidade do Minho Escola de Engenharia Departamento de Informática Miguel Domingues, mi de Fevereiro de E mbedded Applications Hewlett-Packard Patent Home automation Industry automation Security systems Vending machines N etwork appliances Embedding W eb access mechanism in an Appliance for user interface functions including a Web serverand a Web Browser September 21, Patent routers, switches, security sensors, energy monitors...enables in the device: Low development cost Widely accessible Enhanced user interface functions 3 4

14 de Fevereiro de 2003 2 E mbedded Applications Hewlett-Packard Patent Home automation Industry automation Security systems Vending machines N etwork appliances Embedding W eb access mechanism in an

2 E mbedded Systems Paradigm Networking Technology Flexible and easily network integrated User getting closer to the device Connected to the Internet Remotely controlled Extensible and standard API Modularcomponents A Web access mechanism has itall Industrial Vs Internet... Powerline, RS45, RS232,CAN, 12C...IEEE 02.3,ARP, TCP/IP,HTTP Real-time Vs Online-time Reliability and efficiency Maintenance and support Proprietary Vs Open solutions Economical cost 5 6 New Devices - Advantages Conventional Web Server Standardized network access Standardized interface Modular API design Increased functionality Development low cost Large-scale production Functional characteristics are to serve Static content (pages/documents) Dynamic content (pages) as response to an URL. companies are now able to connectlarge-scale networks to embedded devices using and 16 bits microcontrollers such as 051-type. 7

3,ARP, TCP/IP,HTTP Real-time Vs Online-time Reliability and efficiency Maintenance and support Proprietary Vs Open solutions Economical cost 5 6 New Devices - Advantages Conventional Web Server

3 ( ) Conventional Web Server ( ) Conventional Web Server Architecture key points: Simple I/O filesystem for storage Small memory footprint forsearch & replace HTTP com munication model to serve the content Me mory cache could be an advantage Virtual memory is not a requirement Simple processing unit forpage processing but whatifhost-type is embedded? File system is not supported Restricted co m m u nication model a possible solution Flash memory?! this describes the basic framework. Would itbe possible to host a Web server in an embedded 051-type architecture? type Implementation TCP/IP Stack -Limitations LAN controller (IEEE 02.3) MPU controller RJ45 connector(10/100 Mbps) HTTP/TCP/IP/ARP stack API Such as Cygnal C051F005 bits, 25 MIPS, 12 bita/d, 2.4 KB R A M, 32 KB Flash Crystal CS900A 16 bits, 4 KB R A M One receive and one transmitbuffer No reassembling offragmented IP frames T C P maximu m seg m ent advertise of 100 bytes Discard out-of-order TCP segments No supportfor IP type-of-service options No supportfor IP security options compatibility is achieved by implementing only the important parts ofthe protocols, but also due to the tolerance of other stacks

File system is not supported Restricted co m m u nication model a possible solution Flash memory?! this describes the basic framework.

4 Sample W eb Page Web Server- Bench mark Servers response time comparison: 051-type embedded, Custom Web server -60 ms 100 MHz Pentium, Apache Web server -32 ms Client: 500 MHz Pentium, MicrosoftInternet Explorer 5.5, browser network delay -.5 m s Page Total = 7 K B H T M L tags = 0. KB JP E G image = 6.2 KB reference value of 100 ms/page for human consumption ( ) Web Server - Benchm ark ( ) Web Server - Benchm ark Task Search and replace tags Copy buffers Times Run 6 Time (ms) Description TCP/IP Web Page (plus image) HTTP Server Code Space (KB) Write to CS900A ARP 2.5 Parse incoming HTTP headers C Library 2.9 Compute checksums UDP 1.4 Read from CS900A TCP state machine Total Real Total = ms CS900AI/O R S-232 Analog Priority Task Switcher Total Server code = 22 KB, Page code = 7 KB 051 stil waits for a Pentium! 29 KB ofthe 32 K B Flash me m ory available

13 14 ( ) Web Server - Benchm ark ( ) Web Server - Benchm ark Task Search and replace tags Copy buffers Times Run 6 Time (ms) 23. 9.

5 Sum mary Questions W eb technology in embedded devices is a requirement for Ease of use High volume production Standardized interface access Standardized network access Hardware technology was already invented such as 051-type Low cost Ease of integration Relatively high performance Redesign could be the real challenge... when TraditionalIndustry refuses continued innovation costs!? Thank you for your presence! 17 1

invented such as 051-type Low cost Ease of integration Relatively high performance Redesign could be the

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