2.embedded operating system.ppt

7/24/2019 2.Embedded Operating System.ppt

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Introduction to Embedded SoftwareIntroduction to Embedded Software

DevelopmentDevelopment

School of software EngineeringSchool of software Engineering

20052005

2.2. Embedded Operating SystemEmbedded Operating System


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gendagenda

!hat is an Embedded OS"!hat is an Embedded OS"

Embedded system OSEmbedded system OS !indows Embedded!indows Embedded

#$!or%s#$!or%s

Embedded &inu$Embedded &inu$


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gendagenda


Embedded system OSEmbedded system OS !indows Embedded!indows Embedded

#$!or%s#$!or%s



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Operating System 'lavorsOperating System 'lavors

Des%topDes%top !indows ()*+ *, -ome+ *,2000 ,ro/!indows ()*+ *, -ome+ *,2000 ,ro/

acac

ServerServer !indows (*,2000 Server 1dvanced Server/!indows (*,2000 Server 1dvanced Server/

ni$ #arietiesni$ #arieties

EmbeddedEmbedded anyany


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n 3embedded system3 is any computern 3embedded system3 is any computersystem or computing device that performs asystem or computing device that performs adedicated function or is designed for usededicated function or is designed for usewith a specific embedded softwarewith a specific embedded software

application.application.

Embedded systems may use a 4ObasedEmbedded systems may use a 4Obasedoperating system or they may use a dis%operating system or they may use a dis%

based system+ li%e a ,6. 7ut an embeddedbased system+ li%e a ,6. 7ut an embeddedsystem is not usable as a commerciallysystem is not usable as a commerciallyviable substitute for general purposeviable substitute for general purposecomputers or devices.computers or devices.


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!hat ma%es a good Embedded!hat ma%es a good EmbeddedOS"OS"

odularodular ScalableScalable

6onfigurable6onfigurable

Small footprintSmall footprint 6, support6, support

Device driversDevice drivers

etc+ etc+ etc...etc+ etc+ etc...


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!hat ma%es a good 48OS"!hat ma%es a good 48OS"

ultithreaded and preemptibleultithreaded and preemptible

8hread priority has to e$ist because8hread priority has to e$ist becauseno deadline driven OS e$istsno deadline driven OS e$ists

ust support predictable threadust support predictable threadsynchroni9ation mechanismssynchroni9ation mechanisms

system of priority inheritance must system of priority inheritance must

e$iste$ist


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!ho are the Embedded OS!ho are the Embedded OSplayers"players"

icrosofticrosoft Embedded :8*,Embedded :8*,

;;4ealtime< control4ealtime< control

!indows 6E (6E.:E8/!indows 6E (6E.:E8/ Internet devicesInternet devices

,oc%et ,6 2002,oc%et ,6 2002 -andheld ,6=s and ,D=s-andheld ,6=s and ,D=s

!ind 4iver Systems!ind 4iver Systems #$!or%s#$!or%s

pSOSpSOS


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!ho are the Embedded OS!ho are the Embedded OSplayers"players"6ommercial Embedded &inu$6ommercial Embedded &inu$

I4I* Embedded &inu$I4I* Embedded &inu$

6oollogic 6oollinu$6oollogic 6oollinu$

6oventive *linu$6oventive *linu$

Esfia 4ed7lue &inu$Esfia 4ed7lue &inu$

>?@O ,i99a 7o$ &inu$>?@O ,i99a 7o$ &inu$

&ineo Embedi$&ineo Embedi$&ynu$!or%s 7lue6at&ynu$!or%s 7lue6at

onta#ista &inu$onta#ista &inu$

AAAA


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!ho are the Embedded OS!ho are the Embedded OSplayers"players"Open Source Embedded &inu$Open Source Embedded &inu$

Embedded Debian ,roBectEmbedded Debian ,roBect

ETLinux

uCLinux

uLinux (muLinux)


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!ho are the Embedded OS!ho are the Embedded OSplayers"players"

C:* Software SystemsC:* Software SystemsC:*C:*

,alm ,D,alm ,D

,alm OS,alm OS

SymbianSymbian

Symbian OSSymbian OS

reen -ills Softwarereen -ills Software

IntegrityIntegrity

AAAA


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gendagenda

!hat is an Embedded OS"!hat is an Embedded OS" Embedded system OSEmbedded system OS

!indows Embedded!indows Embedded

#$!or%s#$!or%s



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icrosoft obilityicrosoft obility

,latforms,latforms

Increased Functionality

:oteboo% ,6

Complex document

authoring, editing and

reading

Keyoard centric at thedes!

Keyoard and mouse

input methods

Full "#ET $rame%or!

a&ailale

!indows *,*,E!indows *,*,E

8ablet ,6

Complex document

authoring, editing andacti&e reading

#ote ta!ing and in!

annotating

Keyoard centric at the

des!, pen ' !eyoard

a%ay $rom the des!

Keyoard, mouse plus

pen, in!, and speechinput methods

Full "#ET $rame%or!

preinstalled

en, in!, hand%riting and

speech recognition I*s

!indows 6E!indows 6E

Smart

,ersonal

ObBects

+ne%ay

net%or!

In$ormation

consumption

!indows obile!indows obile

Smartphone

In$ormation

consumption

rimarily data

&ie%ing

Integrated phone

%ith - Interoperaility

%ith Exchange

"#ET Compact

Frame%or!

."#ET moile

controls

,oc%et ,6

In$ormation

consumption /ie% and some

data entry

Integrated - %ith

phone

Interoperaility %ith

+$$ice, Exchange

and .0L .er&er

"#ET CompactFrame%or!

."#ET moile

controls


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!indows Embedded 'amily!indows Embedded 'amily


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gendagenda



#$!or%s#$!or%s



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#$!o%s#$!o%s

#$!or%s is a commercial#$!or%s is a commercial hard real timehard real timeoperating system developed by windoperating system developed by windriver systems.river systems.

8he main idea use monolithic %ernel to8he main idea use monolithic %ernel toschedule user tas%s according to userschedule user tas%s according to userdefined priorities. a$imi9e %erneldefined priorities. a$imi9e %ernel

timing predictability.timing predictability. ives the users ma$imal control.ives the users ma$imal control.


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#$!o%s#$!o%s

dedicated real time system+ not dedicated real time system+ notintended as a general purpose OS.intended as a general purpose OS.

lac%s many modern os features thatlac%s many modern os features thatinterfere with real time performanceinterfere with real time performance(flat memory model+ no paging/.(flat memory model+ no paging/.


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#$!o%s#$!o%s Scheduling is done using a preemptiveScheduling is done using a preemptive

priority driven approach+ priorities arepriority driven approach+ priorities arechosen arbitrarily by the user (0255/.chosen arbitrarily by the user (0255/.

,riorities can be changed by the user,riorities can be changed by the user

at runtime but this is discouraged.at runtime but this is discouraged. user can loc% a tas% so that it can=t user can loc% a tas% so that it can=t

be preempted even by higher prioritybe preempted even by higher priority

tas%s or interrupts.tas%s or interrupts. 8his allows the use of the fi$ed priority8his allows the use of the fi$ed priority

response time analysis to chec%response time analysis to chec%schedulability offline.schedulability offline.


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#$!o%s#$!o%s

Is resource sharing aware and has aIs resource sharing aware and has apriority inheritance built in.priority inheritance built in.

Optimi9ations in implementation of theOptimi9ations in implementation of the

conte$t switch and the return fromconte$t switch and the return frominterrupts.interrupts.

8he %ernel never disables :I (non8he %ernel never disables :I (nonmas%able interrupts/ so they aremas%able interrupts/ so they are

always available to the user.always available to the user.


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#$!o%s limitations#$!o%s limitations &ac%s many modern OS features.&ac%s many modern OS features.

uaranteeing the deadlines is theuaranteeing the deadlines is theresponsibility of the user at designresponsibility of the user at designtime.time.

Doesn=t support most modernDoesn=t support most modernapplications and ,Is (only a smallapplications and ,Is (only a smallsubset of ,OSI*/.subset of ,OSI*/.

Despite the flat memory model dynamicDespite the flat memory model dynamicmemory allocation still cases memorymemory allocation still cases memoryfragmenting+ which increases timingfragmenting+ which increases timingunpredictability.unpredictability.


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#$!o%s limitations#$!o%s limitations

dedicated and widely used real time dedicated and widely used real timesystem.system.

Offers the user ma$imal control + butOffers the user ma$imal control + but

also passes him responsibility for thealso passes him responsibility for thedeadlines.deadlines.


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8ornado FF Development tools8ornado FF Development tools


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D7 FF DebuggerD7 FF Debugger


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!ind#iew!ind#iewFF 8racer and naly9erFF 8racer and naly9er


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gendagenda



#$!or%s#$!or%s



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outlineoutline

simple view of embedded &inu$ simple view of embedded &inu$

Developing process of an embeddedDeveloping process of an embedded

devices with embedded &inu$devices with embedded &inu$

Embedded &inu$ #S windows 6EEmbedded &inu$ #S windows 6E


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Embedded &inu$ inEmbedded &inu$ invarious devicesvarious devices

:S personal:S personalassistantassistant


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Developing ,rocessDeveloping ,rocess

&inu$ OS&inu$ OS

selectselect

OS ,orting andOS ,orting and

improvementimprovement

Driver andDriver andpplicationpplication

softwaresoftware

developmentdevelopment

'rom system'rom system

designdesign

ttee

ss

tt

4ehat+bluecat+484ehat+bluecat+48&inu$+onta #ista&inu$+onta #ista

&inu$+48I+A&inu$+48I+A

httplinu$.orghttplinu$.orghttpwww.gnhttpwww.gn

u.orgAu.orgA

8e%ram+-,+Intel+8e%ram+-,+Intel+

AA


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!indows embedded #S!indows embedded #S&inu$ Embedded&inu$ Embedded

rgument between Gerry >rasner andrgument between Gerry >rasner and 4ic% 4ehrbraum4ic% 4ehrbraum

4oyalty4oyalty

DevelopmentDevelopment

environmentenvironment'unctions'unctions

ar%et on timear%et on time

DevelopersDevelopers

#ery cheap#ery cheap:ot all embedded:ot all embeddedwindows productswindows products

betterbetter disagreedisagree

moremore disagreedisagree

shortershorter

moremore

:ot sure:ot sure

:ot sure:ot sure-ardware-ardware

supportsupport eHuivalencyeHuivalency &inu$ better&inu$ better


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!indows embedded #S!indows embedded #S&inu$ Embedded&inu$ Embedded

Oses targeted in current and ne$tOses targeted in current and ne$t

embedded proBects+2002+data from ED6embedded proBects+2002+data from ED6

7oth7othonon

strongstrong

upta%eupta%ecurvecurve

6ont.6ont.


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-omewor%-omewor%

J.J. !hat is an embedded &inu$"ive!hat is an embedded &inu$"ivesome e$amples.some e$amples.

2.2. !hat are the features of embedded!hat are the features of embedded

!indows compared with embedded!indows compared with embedded&inu$"&inu$"

K.K. !hat are the differences of the!hat are the differences of the

development processes when you usedevelopment processes when you usewindows 6E and use embeddedwindows 6E and use embedded&inu$"&inu$"

2.embedded operating system.ppt

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