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VxWorks操作系统下CAN通讯卡的设计与实现.docx

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VxWorks操作系统下CAN通讯卡的设计与实现 Abstract VxWorksoperatingsystemiscommonlyusedinthefieldofembeddedsystemsduetoitsstrongreal-timeperformanceandstability.Inthispaper,wewilldiscussthedesignandimplementationofaCANcommunicationcardontheVxWorksoperatingsystem.ThepaperwillcoverthebasicprincipleoftheCANprotocol,thehardwarearchitectureoftheCANcommunicationcard,andthespecificimplementationprocessoftheCANcommunicationcardundertheVxWorksoperatingsystem. I.Introduction ControllerAreaNetwork(CAN)isapopularcommunicationprotocolthatiswidelyusedinthefieldofembeddedsystems.Itprovidesahigh-speed,reliable,andefficientmeansofcommunicationbetweenmicrocontrollersanddevices.VxWorksoperatingsystemisareal-timeoperatingsystem(RTOS)thatiscommonlyusedinthedevelopmentofembeddedsystems.ThecombinationofVxWorksandCANcommunicationtechnologyprovidesapowerfultoolforthedevelopmentofembeddedsystems. II.BasicPrincipleoftheCANProtocol TheCANprotocolisaserialcommunicationprotocolthatwasoriginallydevelopedforuseintheautomotiveindustry.Itisnowwidelyusedinarangeofapplicationsincludingindustrialautomation,medicalequipment,andaerospace.ThebasicprincipleoftheCANprotocolisthatitallowsmultipledevicestocommunicatewitheachotheroverasharednetwork. IntheCANprotocol,therearetwotypesofnodes:controllersandperipherals.Thecontrollersareresponsibleforsendingandreceivingmessages,whiletheperipheralsareresponsibleforgeneratingandprocessingthemessages.TheCANprotocolusesamessage-basedcommunicationmodelwheremessagesaretransmittedinframes.Eachframeconsistsofanidentifier,whichisusedtoidentifythemessage,andadatafield,whichcontainsthemessageitself. III.HardwareArchitectureoftheCANCommunicationCard TheCANcommunicationcardisaninterfacecardthatisusedtoconnectamicrocontrollertoaCANnetwork.ThehardwarearchitectureoftheCANcommunicationcardconsistsoftwomainparts:themicrocontrollerandtheCANcontroller. ThemicrocontrollerisresponsibleforcontrollingtheoveralloperationoftheCANcommunicationcard.ItisconnectedtotheCANcontrollerthroughaserialinterface.TheCAN