Contiki-a Lightweight and Flexible Operating System for Tiny Networked Sensors

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1、Contiki-aLightweightandFlexibleOperatingSystemforTinyNetworkedSensorsAdamDunkels,Bjorn¨Gron¨vall,ThiemoVoigtSwedishInstituteofComputerSciencefadam,bg,thiemog@sics.seAbstractgramsandservices.Thekernelisevent-driven,butthesys-temsupportspreemptivemulti-threadingthatcanbeappliedWi

2、relesssensornetworksarecomposedoflargenum-onaper-processbasis.Preemptivemulti-threadingisimple-bersoftinynetworkeddevicesthatcommunicateunteth-mentedasalibrarythatislinkedonlywithprogramsthatered.Forlargescalenetworksitisimportanttobeableexplicitlyrequiremulti-threading.todynam

3、icallydownloadcodeintothenetwork.InthisContikiisimplementedintheClanguageandhasbeenpaperwepresentContiki,alightweightoperatingsystemportedtoanumberofmicrocontrollerarchitectures,includ-withsupportfordynamicloadingandreplacementofin-ingtheTexasInstrumentsMSP430andtheAtmelAVR.Wed

4、ividualprogramsandservices.ContikiisbuiltaroundanarecurrentlyrunningitontheESBplatform[5].TheESBevent-drivenkernelbutprovidesoptionalpreemptivemulti-usestheMSP430microcontrollerwith2kilobytesofRAMthreadingthatcanbeappliedtoindividualprocesses.Weand60kilobytesofROMrunningat1MHz.

5、Themicrocon-showthatdynamicloadingandunloadingisfeasibleinatrollerhastheabilitytoselectivelyreprogrampartsoftheresourceconstrainedenvironment,whilekeepingthebaseon-chipashmemory.systemlightweightandcompact.Thecontributionsofthispaperaretwofold.Ourrstcon-tributionisthatweshowt

6、hefeasibilityofloadablepro-gramsandserviceseveninaconstrainedsensordevice.Thepossibilitytodynamicallyloadindividualprograms1.Introductionleadstoaveryexiblearchitecture,whichstilliscompactenoughforresourceconstrainedsensornodes.OursecondWirelesssensornetworksarecomposedoflargen

7、um-contributionismoregeneralinthatweshowthatpreemp-bersoftinysensordeviceswithwirelesscommunicationca-tivemulti-threadingdoesnothavetobeimplementedatthepabilities.Thesensordevicesautonomouslyformnetworkslowestlevelofthekernelbutthatitcanbebuiltasanap-throughwhichsensordataistra

8、nsported.Thesensorde-plicationlibraryontopofanevent-dr