《CAN通讯协议介绍》PPT课件

《《CAN通讯协议介绍》PPT课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、CANBusHands-OnCoursePresentedby:IntrepidControlSystems,Inc.QinWenSalesEngineerTel:+86-137-6464-9956Email:qinwen@intrepidcs.com1ObjectivesLearnthebasicsoftheCANprotocolUnderstandwhatmakesupaCANnetworkUnderstandwhatmakesupaCANnodeLearnhowCANcomparestocompetitiveprotocolsLearnhowtous

2、eaCANtesttoolandaCANDatabase(DBC)filetomonitorandtransmitCANmessagesandsignals2AgendaPart1:LearnthehighlevelCANfeaturesPart2:UnderstandtheCANmessagePart3:UnderstandhowmessagesarecommunicatedbetweenCANnodes3Part1:TheBigPicture4WhatisCAN?Standsfor:Controller–AreaNetworkDevelopmento

3、ftheCAN-busstartedoriginallyin1983atRobertBoschGmbHTheprotocolwasofficiallyreleasedin1986attheSocietyofAutomotiveEngineers(SAE)congressinDetroit5CANKeyFeaturesSpeedupto1MbpsNon-destructivemessagearbitrationAllnodesreceiveallmessagesNoguaranteedmessagelatency6CostvsDataRateLINCANFl

4、exRayMOST12510RelativecostpernodeDatarate[bps]20K1M10M25M7CANvsLINCANismuchfaster:upto1MbpsLINoffersatimedeterministicmodelCANoffersamorepowerfulchecksumUsesLDFinsteadofDBCfilesfordatabases8CANvsFlexRayFlexRaynetworkstartupmorecomplicatedFlexRayofferstimedeterministiccommunication

5、sFlexRayoffersfaulttoleranceusingvariousmechanismsFlexRayofferslargerdataframesUsesFIBEXinsteadofDBCfiles9CANvsMOSTMOSTistargetedatinfotainmentapplicationsMOSToffersdedicatedtransfersinaringnetworkat25MbpsOptical,50MbCopper,and150Mbpsopticalphysicallayers10CANHardwareFeaturesModer

6、atecostsiliconimplementationRequireshardwareCANcontrollerandCANtransceiverRequireshardwareCANtransceiverMicroprocessorCANTransceiverCANControllerCANHighCANLowGround11Quiz11.CANguaranteesmessagelatency.(TrueorFalse)2.CANrequireshardwarecontrollers.(TrueorFalse)3.CANissimilartoLI

7、N:bothhaveverydefinedmessagestructure.(TrueorFalse)4.WhatisthemaximumnumberofbytescanbeinaCANmessage?12CANPhysicalLayersHighSpeedCAN:upto1MbpsLowSpeedFaultTolerantCAN:upto125kbpsSingleWireCAN:upto83.3kbps132.53.5V1.5tCANHighCANLowRecessiveDominantCANDualWirePhysicalLayers14CANN

8、ode1CANNode2CANNode3120Ohm120OhmC