基于单片机的can实验系统设计外文翻译

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1、机电与车辆学院毕业设计（论文）外文翻译题目：基于单片机的CAN实验系统设计专业：电子信息工程班级：姓名：学号：指导教师：日期：2012年5月29日HowtheCANnetworkfunctionsPrinciplesofdataexchange.WhendataaretransmittedbyCAN,nostationsareaddressed,butinstead,thecontentofthemessage(e.g.rpmorenginetemperature)isdesignatedbyanidentifierthati

2、suniquethroughoutthenetwork.Theidentifierdefinesnotonlythecontentbutalsothepriorityofthemessage.Thisisimportantforbusallocationwhenseveralstationsarecompetingforbusaccess.IftheCPUofagivenstationwishestosendamessagetooneormorestations,itpassesthedatatobetransmittedan

3、dtheiridentifierstotheassignedCANchip(”Makeready”).ThisisalltheCPUhastodotoinitiatedataexchange.ThemessageisconstructedandtransmittedbytheCANchip.AssoonastheCANchipreceivesthebusallocation(”SendMessage”)allotherstationsontheCANnetworkbecomereceiversofthismessage(”Re

4、ceiveMessage”).EachstationintheCANnetwork,havingreceivedthemessagecorrectly,performsanacceptancetesttodeterminewhetherthedatareceivedarerelevantforthatstation(”Select”).Ifthedataareofsignificanceforthestationconcernedtheyareprocessed(”Accept”),otherwisetheyareignore

5、d.Ahighdegreeofsystemandconfigurationflexibilityisachievedasaresultofthecontent-orientedaddressingscheme.ItisveryeasytoaddstationstotheexistingCANnetworkwithoutmakinganyhardwareorsoftwaremodificationstotheexistingstations,providedthatthenewstationsarepurelyreceivers

6、.Becausethedatatransmissionprotocoldoesnotrequirephysicaldestinationaddressesfortheindividualcomponents,itsupportstheconceptofmodularelectronicsandalsopermitsmultiplereception(broadcast,multicast)andthesynchronizationofdistributedprocesses:measurementsneededasinform

7、ationbyseveralcontrollerscanbetransmittedviathenetwork,insuchawaythatitisunnecessaryforeachcontrollertohaveitsownsensor.BroadcasttransmissionandacceptancefilteringbyCANnodesNon-destructivebitwisearbitration.Forthedatatobeprocessedinrealtimetheymustbetransmittedrapid

8、ly.Thisnotonlyrequiresaphysicaldatatransferpathwithupto1Mbit/sbutalsocallsforrapidbusallocationwhenseveralstationswishtosendmessagessimult