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大连理工大学城市学院本科生毕业设计(翻译)30大连理工大学城市学院本科生毕业设计（翻译）学院：电子与自动化学院专业：自动化学生：指导教师：王颖完成日期：2015年3月2日大连理工大学城市学院本科生毕业设计（翻译）uC/OS-IIITheReal-TimeKernel总计毕业设计（翻译）28页表格1个插图4幅PrefaceWHATISuC/OS-III?uC/OS-III(pronounced“MicroCOSThree)isascalable,ROMable,preemptivereal-timekernelthatmanagesanunlimitednumberoftasks.uC/OS-IIIisathird-generationkernelandoffersalloftheservicesexpectedfromamodernreal-timekernel,suchasresourcemanagement,synchronization,inter-taskcommunications,andmore.However,uC/OS-IIIoffersmanyuniquefeaturesnotfoundinotherreal-timekernels,suchastheabilitytocompleteperformancemeasurementsatrun-time,todirectlysignalorsendmessagestotasks,achievependingonmultiplekernelobjects,andmore.WHYANEWuC/OSVERSION?TheuC/OSseries,firstintroducedin1992,hasundergoneanumberofchangesovertheyearsbasedonfeedbackfromthousandsofpeopleusinganddeployingitsevolvingversions.uC/OS-IIIisthesumofthisfeedbackandexperience.RarelyuseduC/OS-IIfeatureswereeliminatedandnewer,moreefficientfeaturesandservices,wereadded.Probablythemostcommonrequestwastoaddroundrobinscheduling,whichwasnotpossibleforuC/OS-II,butisnowafeatureofuC/OS-III.uC/OS-IIIalsoprovidesadditionalfeaturesthatbetterexploitthecapabilitiesoftoday’snewerprocessors.Specifically,uC/OS-IIIwasdesignedwith32-bitprocessorsinmind,althoughitcertainlyworkswellwith16-andevenseveral8-bitprocessors.uC/OS-IIIGOALSThemaingoalofuC/OS-IIIistoprovideabest-in-classreal-timekernelthatliterallyshavesmonthsofdevelopmenttimefromanembedded-productschedule.Usingacommercialreal-timekernelsuchasuC/OS-IIIprovidesasolidfoundationandframeworktothedesignengineerdealingwiththegrowingcomplexityofembeddeddesigns.AnothergoalforuC/OS-III,andthereforethisbook,istoexplaininnerworkingsofacommercial-gradekernel.Thisunderstandingwillassistthereaderinmakinglogicaldesigndecisionsandinformedtradeoffsbetweenhardwareandsoftwarethatmakesense.Chapter1IntroductionReal-timesystemsaresystemswherebythecorrectnessofthecomputedvaluesandtheirtimelinessareattheforefront.Therearetwotypesofreal-timesystems,h
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