stack description中英文对照本文件目是说明与KVASERJ1939协议栈接口要求这包括

KVASERJ1939protocolstackKVASERJ1939协议栈ThepurposeofthisistodescribetherequirementsforinterfacingwiththeKVASERJ1939stack.Thisincludesadescriptionofthefunctionsprovidedbythestackwithintendedusageandrestrictions.Thisalsodescribesthenecessarysupportroutinestheusermustprovideforthestacktofunctioncorrectly.J1939isahigherlayerprotocol(HLP)definedbytheSocietyofAutomotiveEngineers(SAE)forcontrollerareanetworks(CAN)intheautomotiveandaerospaceenvironment.TheKVASERJ1939stackimplementstheHLPrequirementsfortransmittingandreceivinginformationontheCANbusthatarenotapplicationspecific.ThestackisimplementedinANSICforgreater本文件的目的是说明与KVASERJ1939协议栈接口的要求。这包括协议栈的使用和限和接收信息。该堆栈在ANSIC实施中有更好的便携性。Definitionsandtargetsystemthecomputersystem/tformwherethepieceofsoftwareis ControllerAreaNetwork ionLayer HigherLayerProtocol SocietyofAutomotiveEngineers ParameterGroupNumber 电脑的软件运行系统/ ControllerAreaNetwork控制局域网 ionLayer硬件提取层 HigherLayerProtocol协议 SocietyofAutomotiveEngineers汽车工程师 ParameterGroupNumber TrademarkStackTheKVASERJ1939stackfunctionalityissummarizedinFigure1.Thoughthefunctionalitydoesnotcoveralloftherequirementsnecessarytohaveacertifiedproduct,theuser’sapplicationonlyneedstobeconcernedwithusingthedatainreceivedmessagesandwhentotransmitmessages.KVASERJ1939栈功能概述如图1Functions

Thestack’sfunctionalitycanbegroupedintotwomajorareas:addressclaimandtransportprotocolprocessing.TheseareasarecommonforallJ1939applications.ThestackcoversalloftheJ1939addressclaimrequirements.Thestackisforgeneratingtheappropriateaddressclaimmessageresponseswhenawiththestack’snetworkaddressoccurs.ThestackstartstheaddressclaimprocesswiththefirstcalltokvProcessJ1939Messages.TheapplicationcanmonitortheclaimprocessbycallingkvCurrentJ1939Nadandexaminingthereturnedvalues.Thestackalsohandles.RequestmessagesfortheAddressClaimPGN.ThestackwillalsorestarttheaddressclaimprocesswiththespecifiednetworkaddressifaCommandedAddressmessageisreceived.Thestackonlyprovidesforthepacketizationandreassemblingoftransportprotocolmessages.Thestackprovidesthisfunctionalityforbothmanagedconnectionandmultipacketbroadcastcommunication.Whenpassedatransportprotocolmessagebufferfortransmission,thestackisresponsiblefortransmittingtheappropriatecontrolmessageframes,breakingthemessagedataintotheappropriatedataframes,andcingtherequiredtimegapsbetweenmessagetransmissions.ThestackalsomonitorsforexcessivetimedelaysbasedonJ1939specifiedtimeouts.Whenreceivingtransportprotocolmessages,thestackwillgenerateanynecessaryconnectionmanagementresponsesaswellasthrowawayanyabortedmessagetransmissions.Thismeanstheapplicationwillonlyseecompletedtransportprotocolmessageswiththetransportwrapperdataremoved.堆栈的功能可分为两个主要领域：地址索赔和协议处理。这些领域对所有J1939协议栈涵盖所有的J1939处理索赔要求堆栈负责在协议栈的网络地址发生时产生策以及扔掉任何讯息传输。这意味着该应用程序将只能看到邮件传输协议完成的Application’sIfyouhavehadtimetoreadtheJ1939specification,youwillnoticethatmanyoftherequirementsareaimedattheapplicationlevel.Forthisreason,usingthisstackforcommunicationisnotenough.Theremainderofthissectionisdevotedtodescribingissuestheapplicationshouldbeawareof.TheapplicationisresponsibleforgeneratingtheappropriatemessageresponsetoRequestmessagesforPGNsthatarenottheAddressClaimThoughthestackprovidestransportprotocolprocessing,theapplicationisresponsibleforcingthedatainamessagebuffercorrectly.J1939definesthebyteorderandrepresentationforeverydataiteminamessage.ThestackprovidesamessagebufferoftheappropriatesizeandexpectstheapplicationtocethedatacontentaccordingtoJ1939’srules.Thereasonforleavingthisresponsibilitytotheapplicationdesignerishisabilitytooptimizetheroutinesforthecompilerandtargetbeingused.Inordertoperformtransportprotocolpacketizationandreassembly,thestackmaintainscontrolofthemessagememorybuffers.Itisessentialthattheapplicationuseonlythemessagebuffersprovidedbythestack.Likewise,oncetheapplicationisfinishedreceivingdatafromamessagebuffer,themessagebuffershouldbereturnedtothestack.为了履行议定书打包和重组，堆叠保持了控制信息缓冲器。这是至关重要的 ionTheHALdefinesastandardsetofinterfaceroutinesforaccessingCANhardware.ThisallowstheHLPcodetobeportedbetweendifferentprocessorandCANmoduletargetswithoutmodification.ImplementationsoftheHALinterfaceareavailableforseveraltargettforms.Ifyouareim