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)isdesignatedbyanidentifierthatisuniquethrou

2、ghoutthenetwork.Theidentifierdefinesnotonlythecontentbutalsothepriorityofthemessage.Thisisimportantforbusallocationwhenseveralstationsarecompetingforbusaccess.IftheCPUofagivenstationwishestosendamessagetooneormorestations,itpassesthedatatobetransmittedandtheiridentifierstotheas

3、signedCANchip(”Makeready”).ThisisalltheCPUhastodotoinitiatedataexchange.ThemessageisconstructedandtransmittedbytheCANchip.AssoonastheCANchipreceivesthebusallocation(”SendMessage”)allotherstationsontheCANnetworkbecomereceiversofthismessage(”ReceiveMessage”).EachstationintheCANne

4、twork,havingreceivedthemessagecorrectly,performsanacceptancetesttodeterminewhetherthedatareceivedarerelevantforthatstation(”Select”).Ifthedataareofsignificanceforthestationconcernedtheyareprocessed(”Accept”),otherwisetheyareignored.Ahighdegreeofsystemandconfigurationflexibility

5、isachievedasaresultofthecontent-orientedaddressingscheme.ItisveryeasytoaddstationstotheexistingCANnetworkwithoutmakinganyhardwareorsoftwaremodificationstotheexistingstations,providedthatthenewstationsarepurelyreceivers.Becausethedatatransmissionprotocoldoesnotrequirephysicaldes

6、tinationaddressesfortheindividualcomponents,itsupportstheconceptofmodularelectronicsandalsopermitsmultiplereception(broadcast,multicast)andthesynchronizationofdistributedprocesses:measurementsneededasinformationbyseveralcontrollerscanbetransmittedviathenetwork,insuchawaythatiti

7、sunnecessaryforeachcontrollertohaveitsownsensor.BroadcasttransmissionandacceptancefilteringbyCANnodesNon-destructivebitwisearbitration.Forthedatatobeprocessedinrealtimetheymustbetransmittedrapidly.Thisnotonlyrequiresaphysicaldatatransferpathwithupto1Mbit/sbutalsocallsforrapidbu

8、sallocationwhenseveralstationswishtosendmessagessimult