›› 2016, Vol. 36 ›› Issue (2): 28-.doi: 10.16708/j.cnki.1000-758X.2016.0003

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Worstcaseresponsetimeanalysisofmultilevelinterruptsystems

 YU  Guang-Liang, YANG  Meng-Fei, XU  Jian, JIANG  Hong   

  1. 1BeijingInstituteofControlEngineering,Beijing100190,China 2ChinaAcademyofSpaceTechnology,Beijing100094,China
  • Received:2015-05-08 Revised:2015-07-27 Online:2016-04-25 Published:2015-09-28

Abstract: Acomputationmodelintegratedwithinterruptsandtaskswaspresentedfortheanalysisofworstcaseresponsetime(WCRT)foranaerospaceembeddedsystemwithmultilevelinterrupts.Bothinterruptsandtaskswasusedforaunifiedprioritydefinitioninthismodel,sothetiminganalysisofnestedinterruptscanbecombinedwithtaskresponsetimeanalysistechniques.TheWCRTofbothinterruptsandtaskswasderivedintheintegratedmodel.Furthermore,detaileddescriptionsofkeyparameterswereproposedandthedifferencesbetweeninterruptsandtaskswerealsodiscussed.TheopensourceLEON3processorplatformandModelsimsoftwarewereintroducedtosimulateandverifythemethod.TheresultsshowthattheoverestimateoftaskWCRTislessthan5%whichdemonstratestheeffectivenessofthemethodandthevalueforengineeringapplications.

Key words: realtimesystem, embeddedsoftware, multilevelinterrupt, fixedpriorityscheduling, schedulabilityanalysis, worstcaseresponsetime, spacecraft