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多核用于嵌进式及时系统Overview.ppt

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Real-TimeComputing Chapter1Overview 1WhatisReal-TimeComputing WirelessSensorNetworks(WSN) sensors+microcontroller+radio+networks Allfeasibleatverysmallscale e.g.,BerkeleySmartDust，MICA2MoteCornercube三面直角棱镜Retroreflector回射器 Interrogating询问 Beamsteering光束控制 Photodetector光电探测器ApplicationofWSN PervasiveComputing(UbiquitousComputing) Pervasivecomputingisthetrendtowardsincreasinglyubiquitous,connectedcomputingdevicesintheenvironment,atrendbeingbroughtaboutbyaconvergenceofadvancedelectronic(particularlywireless)technologiesandtheInternet. Avionics Avionics Avionics PervasiveComputing(UbiquitousComputing) Pervasivecomputingisthetrendtowardsincreasinglyubiquitous,connectedcomputingdevicesintheenvironment,atrendbeingbroughtaboutbyaconvergenceofadvancedelectronic(particularlywireless)technologiesandtheInternet. Examples Avionic(flightcontrol,firecontrol,missilelaunching……) Marsrover Manufacturing Nucleusreactorcontrol WhatisRTS? “AnysystemwhereatimelyresponsebythecomputertoexternalstimuliisvitalisaReal-TimeSystem”. ······ ClassificationofRTS? TherelationshipbetweenEmbeddedSystems&RTS Applicationspecific Specializeandoptimizethedesignforspecificapplication Notageneral-purposecomputer(Don’tneedallthebellsandwhistles,e.g.,harddrive,monitor,keyboard……) Havetoworryaboutbothhardwareandsoftware DoesERTSneedsOS? SoftwarearchitectureofERTS(P10) Pollingloop Foreground/Background(Interruption&Cocurruncy) Multitask Multitask&OperatingSystem(OS) WhatisthedifferencebetweengeneralOSandERTOS(RTOS)? PopularERTOS? VxWorks,INTEGRITY(MULTI),TinyOS,Nuclear,WindowsCE,Wondowsmobile,uC/OS,DeltaOS,pSOS+,VRTX,QNX,RTEMS,Cisco-IOS,NOKIA／ERISON-EPOC,Android…… Linux RTLinux,www.rtlinux.com RTAI,www.rtai.org Linux-SRT,www.cl.cam.ac.uk/~dmi1000/linux-srt Embdix,www.lineo.com ETLinux,www.prosa.it/etlinux uCLinux,www.uclinux.org uLinux,www.sunsite.auc.dk/mulinux …… Reading C.M.Krishna,KangG.Shin,REAL-TIMESYSTEMS,TsinghuaUniversityPress,McGraw-Hill 邵贝贝等译.嵌入式实时操作系统uC/OS-II(第2版).北京:北京航天航空大学出版社,2003 WayneWolf