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外文翻译--基于嵌入式实时操作系统的工程机械智能显示仪的研究 英文版【优秀】.pdf

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外文翻译--基于嵌入式实时操作系统的工程机械智能显示仪的研究 英文版【优秀】.pdf

TheEighthInternationalConferenceonElectronicMeasurementandInstrumentsICEMI2007ResearchontheIntelligentDisplayInstrumentforConstructionMachineryBasedonEmbeddedRTOSXuChuanpeiLiZhiHuCongWangWeiÄDept.ofElectronicEngineeringGuiLinUniversityofElectronicTechnology,Guilin,541004ChinaAbstractTakingtheintelligentwheelloaderasaninstance,thispaperresearchesontheintelligentdisplayinstrumentforConstructionMachinerybasedonembeddedRTOS.AstructureofembeddedsystembasedonRTOSisproposed,anddesignsofboththehardwareandsoftwarearecompleted.ThesystemtakestheTMS320LF2407AchipoftheTIasthehardwareplatform,andtherealtimeoperatesystemofC/OSasthesoftwareplatformcompletesrealtimemonitoringandmanagementoftheconstructionmachinerybytheCANbuscommunicatingwiththemaincontroller.KeywordsEmbeddedSystemC/OSTMS320LF2407ACANBusDisplayInstrument1IntroductionTheconstructionmachinerydisplayinstrumentistheimportantinterfacebetweenthedriverandtheconstructionmachinerytocommunicateinformation,whichplaysavitalroletotheconstructionmachinerysecurityandtheeconomy.Inrecentyears,alongwiththeconstructionmachineryelectronictechnologydevelopment,theinformationwhichdisplayedontheconstructionmachineryinstrumentisunceasinglyincreasing.Thetraditionalmechanicalindicatorforconstructionmachinerycombinationinstrumentismoreandmoreunabletomeettheactualneeds.Particularly,withthecomputer,themicroelectronanddifferentkindsoffieldbuscommunicationbecomewidespreadapplications,takingtheembeddedmicroprocessorasthecoreintelligentdigitaldisplayinstrumentwouldbeaninevitabletrendfortheconstructionmachineryinstrumentdevelopment.Thispapercombinestherealtimeembeddedtechnology,theCANbustechnology,thetouchscreentechnologyandtheGPSpositiontechnologytogethertoapplytotheconstructionmachineryLCDmonitor,withthewheeledloaderastheresearchobject,andresearchesontheintelligentdisplayinstrumentforconstructionmachinery.2SystemArchitectureThearchitectureoftheonboardintelligentdisplayinstrumentsystemiscomposedofthepowersourcemodule,theDSPmodule,theLCDmodule,themechanicalkeyboardmodule,thetouchscreenmodule,theGPSorientationmodule,theADsupplementallightingsamplemodule,theCANcommunicationinterfacemoduleandthesoundalarmingmodulesetc.,whichareshownasfigure1.TMS320LF2407AControllerµC/OSIIRTOSPowersourcemoduleADmoduleSupplylightingsampleMechanicalkeyboardmoduleCANmoduleWheeledloadermaincontrollerSCImoduleGPSPositionmoduleLCDDisplayTouch3.3V5VlevelisolateTurninglampsampleOptoisolateTurningcontrolSoundalarmingmodulesFig.1IntelligentDisplayInstrumentSystemArchitectureThepowersourcemoduledealswiththevehicle24Vpowersourcewiththefilterconditionsremovesthepossiblenoises,outputsforthemaincontrollermoduleandtheLCD.Thepowersourceis48241424411351/07/25.00©2007IEEE.AuthorizedlicenseduselimitedtoJILINUNIVERSITY.DownloadedonDecember17,2008at0608fromIEEEXplore.Restrictionsapply.TheEighthInternationalConferenceonElectronicMeasurementandInstrumentsICEMI2007transformedto3.3Vand5VconstantvoltagesupplypowerforothermodulesintheLCD.TheDSPmoduleincludsTMS320LF2407Achip,extendprogramanddatamemory,resetchipetc.,whichisthehardwareplatformofthisembeddedrealtimeoperatingsystem.TheLCDdisplaymoduleisthehumanmachineinterfaceusedfordisplayingallkindsofstatusinformationofthewheeledloaderwhichistransmittedthroughtheCANbus.Themechanicalkeyboardandthetouchscreenaretheinstrumentstoachievetheoperatorcontrollingandmonitoringwheeledloaderwithallkindofstatusintime.TheGPSpositionmoduletransmitsthewheeledloadergeographicalpositioninformationtothedisplayinstrumentaboutthewheeledloaderthroughtheSCI.Thedisplayinstrumenttransmitstheinformationtothemaincontrollerforprocessingontime.Consequently,thelongdistancesupervisorcentercanrealtimequerythewheeledloadersworkingpositionbytheGPRSwirelessnetwork.Whenthelighteningofthewheeledloadersworkingenvironmentisinsufficient,theADsupplementallightingsamplemoduleautomaticallyopensasupplementallighttostrengthenthebrightness,whichisconvenientforoperatorcontrolling.TheCANbusmoduleisthekeyforthedisplayinstrumentandthewheeledloadermaincontrollercommunication.ThedisplayinstrumentcouldgetallkindsofoperationalparametersandthedataoftheentirewheeledloaderonlythroughtheCANcommunication,andcouldcontrolthewheeledloadertocarryonthecorrespondingfunctionaloperations,whichisakeypositiontoconnectthedisplayinstrumentandthemaincontroller.Whenthewheeledloaderworkswithsomefaults,thedisplayinstrumentcouldpromptalarmsbythespeechalarmingmodule,whichcouldinformtheoperatorimmediatelytocarryonprocessingtothesefaults,thusmayavoidgreateconomicloss.TheembeddedsystemsoftwareachievestointelligentLCDmonitoronthewheeledloaderandinteractdatawiththewheeledloadermaincontrollerbasedonthisplatformofhardwarefunctionmodule.3SystemHardwareDesignThedisplayinstrumentisresponsiblefordisplaying,monitoring,processingandcontrollingofallkindsofparametersofthewheeledloadermaincontrollerwhicharereceivedfromtheCANinterface.Accordingtothefunctionsoftheintelligentdisplay,itcanbedividedintofollowingmodulecircuitstodesign1TheprocessorofTMS320LF2407AmaincircuitincludestheCANinterface2Keystrokegatheringcircuit3Touchscreenmodule4Powersourceprocessingmodule5GPSpositionmodule6Liquidcrystalinterfacecontrolcircuit7Speechchipcontrolcircuit8Distinctionchangescircuitetc.Theschematicsystemhardwareisshownasfigure2.TMS320LF2407AextendprogramanddatamemoryAddBusDataBuswheeledloadermaincontrollerCANLevelisolation74LVTH245LCDTouchIOGPSSCIMechanicalKeysSupplementallightingturninglampsampleADCoptocouplerSCICANIOADC1IOPOWERFig.2SchematicsystemhardwarecircuitAccordingtothesystemhardwareplatform,dividetheresourcesontheplanofthemicroprocessorDSPLF2407A11channelADinput,usestheonchipADCmoduleADC1212mechanicalkeystrokesampling,achieveswithIOPE0IOPE7andXINT132channelswitchinputsleftrightturnsignallamp,usestwoIOport4CommunicationwithGPSusingonchipSCImodule5CANbusinterface,usingonchipCANcontroller6ControlofthespeechchipwiththeIOport4825AuthorizedlicenseduselimitedtoJILINUNIVERSITY.DownloadedonDecember17,2008at0608fromIEEEXplore.Restrictionsapply.TheEighthInternationalConferenceonElectronicMeasurementandInstrumentsICEMI20077ThedatamemoryandtheprogrammemoryextendinterfaceD0D15,A0A158TheJTAGsimulationinterface,thecrystaloscillatorclockinput,resetsignal,thepowersourcepinetc.BecausetheTMS320LF2407Aworkson3.3Vvoltage,inordertoavoidleveltransforming,thesystemusestwopiecesofCY7C1021CV33chipswhichmadeinCypressCorporationtoexpandsystemexternalmemoryspace.CY7C1021CV33isoneofthe64Kbyte,16bitstaticRAM,3.3Vpowersupply.InordertoadapttheDSPofTMS320LF2407A3.3Vworkingvoltageandsatisfythelowpowerconsumptionfeatures,SN65HVD232isselectedforCANbustransceiverofTICorporation.ItisonekindofCANbusdevicewith3.3V/5Vmixedvoltage.Thistransceiverfeaturesasflowsthesignaltransferratecanachieve1Mbpssignaldistanceis40m,andquitelowmaintenancecurrent.Thusitusesforquiteideallylowpowerconsumption.InthedesignusingthisCANbustransceivertocommunicatebetweenthedisplayinstrumentandthemaincontrollerofintelligentwheelloader.Inthedesign,consideringthatitmustcontrolandprocesstheheadandtailrainwiper,theheadandtaillamp,thefrontheadlamp,thesprayingofwater,thesmalllamp,theworkpump,theparking,thenamelysentinformation,thealarminformation,themenuoperationofthewheelloaderetc.,12mechanicalkeystrokearedesignedinthissystemactingasmanmachineinteractionmethodforthedisplayinstrumentandthewheelloadermaincontrol.Aftertheoverallevaluation,CM3202407SLYBofShenzhenBrilliantCrystalTechnologyCO.LTDisselectedfortheliquidcrystalmodule.ItisasectionproperattentiontobothChineseandEnglishwritingandthecartographypatternspotmatrixliquidcrystaldisplaymodule,thebluecolorbacklight,includebuildin512KBytetheROMglyphcode,candisplayChinesecharacter,numericcharacter,Englishletter,Japaneseletter,Europeanletteretc.,andincludesbuildinTwoPagedisplaymemory.Inthecharacterpattern,itcanreceivethestandardChinesecharacterencodingtodisplayChinesedirectly,butdoesnotneedtoenterthecartographypatterntodepictChinese.Itcancutmuchmicroprocessortime,promoteliquidcrystaldisplayChineseefficiently.Itsupports4/8of6800/8080MCUinterface,includebuildin88keyboardscanningKeyScan,supportscreenrollsuphorizontallyandrollsupvertically,insidesitconstructs512ByteSRAMtobepossibletomakethecharactercustom,providetheChineseandEnglishcharacteralignandinside10BitADCsupporttouchscreenapplication.Becauseofthoseadvantages,soweusedtheRA8803withitstouchscreenfunctionforthetouchscreenfunctionprograminthedesigns.WhentheprocessorofLF2407Aworksin40MHz,itcanresultintimingconfusionbecausetheRA8803workingfrequencycannotfollowDSPworkingfrequencybyfar.Consideringtheabovefactor,IOPBofDSPisselectedasthedatalineconnecttoLCDdataportDB0DB7,usingIOofIOPFastheLCDtimingcontrolwiretooperatetheliquidcrystal.Althoughitsspeedisslow,itcanguaranteethesystemwithstability.4SoftwareDesignoftheSystemThetaskdivisionandthepriorityassignmentarebasedonthefunctionrequirements.ThefunctionsofthedisplayinstrumentrequiredaregivenasfollowsItshouldgainthereal7timedata,faultinformation,remindingmessages,shortmessagesbycommunicatingwiththemaincontrollerofthewheelloader,andthendisplayonLCD8Sampleskeystrokeofmechanicalkeyboardcontrolsthemaincontrollertocarryonthecorrespondingoperationthroughdifferentkeystrokeinformation.9OnechannelADsample.SamplesonechannelanalogvaluethroughtheDSPADCfunction,thatistosay,itcarriesonmakinguplightgatheringwheninsidecablightisinsufficient,thelightlampisturnedonautomaticallyTouchscreeninformationgathering.Thetouchscreenfunction,insteadofthemechanicalkeyboard,canfacilitatethedrivermuchbetterto4826AuthorizedlicenseduselimitedtoJILINUNIVERSITY.DownloadedonDecember17,2008at0608fromIEEEXplore.Restrictionsapply.TheEighthInternationalConferenceonElectronicMeasurementandInstrumentsICEMI2007operating.Accordingtothewheelloaderoperatorsoperationinformation,aturningdirectionisdecided,andthenlightentheturninglampasthecorrespondingchanges.Accordingtothedriver,thecontrolcommandshouldberespectivelysenttothemaincontrollerofthewheelloaderandtheexecutivecomponentsoflight,rainblows,andbrake,thenthedisplayinstrumentshouldreadthefeedbackandjudgetheexecutingimplementationworkingconditions.ItshouldgainthelatitudeandlongitudeinformationbytheSCIcorrespondencebetweenthedisplayinstrumentandtheGPSmodule,anduploadtimingtostoretheinformationinthemaincontrolleraccordingtothedemand.Task4,systeminitializationincludesstartingthesystemclock,systeminitialization,initializationkeystrokegainingprocedure,thetouchscreenfunction,thefaultinformationpointertable,startingalarmfunction.ThedividingreasonisgivenasfollowsTheC/OSIIclockTICKinterruptiscompletedbytherealtimeclock,butthe2407chipdoesnothavethistimer,soitshouldusegeneraltimerT1tocomplete.ThefollowingtipsshouldbepaidattentionClearinterruptflagintheTICKinterrupt.7thetimershouldbestartedupinthehighestpriority8duty,ifitisstartedupbeforeOSStartstarts,thesystemwillcollapse.Thefunctionsofkeyboardsample,touchscreenandsoonaffectthelateroperationdirectly.Andthefaultinformationtablesaffectthefollowingfaultdisplaying.Ifthealarmflagisopened,itcangivethespeechalarmforthefaultofthewheelloaderatthefirsttime.Allofthesebelongtoaninitializationpart,andneedtobestartedbeforeothertasksthereforewegroupthemasawholetask.Task5,taskforCANcommunication.Ifthedisplayinstrumentnormallylinkswiththemaincontroller,itgetsallkindsofparametersofthemaincontrollerimmediately,andshowsdynamicallyonLCDafterbeingprocessed.ThedivisionreasonsareshownasbelowAccessingandupdatingtherealtimeofthemaincontrollerdataisveryimportanttotheoperators.Theoperatorsneedtogetthestatesofthemachineintime.Therefore,thecommunicationbetweentheCANbusandthemaincontrollerisessentialtothedesign,sowetakeitastheonlyinferiortasktoopeningtheclock.Task6,taskforsupplementallightingsample.FortyeightLEDswouldautomaticallyturnontohelptheoperatorsbyimprovingtheintensityoflightwhenthewheelloaderisworkingatlightinsufficientlyorinthedark.Itopensanalarmattheendofthetask.Theworkingconditionofwheelloaderisgenerallysobadthatthelightiscomparativelydim,sowetakethetask6asanindependentmoduleandgiveitprioritycomparatively.Task7,taskforkeyboarddistinguishing.Thistaskwillsamplekeystroke,andtriggerdifferentdisplayfunctionsandtasksaccordingtodifferentkeystroke.Wetakethistaskasanindependentmoduletomakemanmachineinterface.Task8,taskfortouchscreen.Thistaskissimilartothetask7.Wetakethistaskasanindependentmoduletomakemanmachineinterface.Itcantakeplaceofthetask7.Task9,taskfordistinguishingwhichturninglampisturnedon.Thisfunctioncandistinguishwhichdirectionthewheelloaderhasturnedtoandindicateacorrespondingsymbolonthetouchscreen.Wetakethistaskasanindependentmodule.Tasks13,taskofotherfunctionsexpectthemaininterfaceandtheworkpumpmonitoringinterface.Itincludescontrollinganddisplayingvariouskeystrokeofthewheelloader.Wetakethistaskasanindependentmodule.Task15,taskforinterfaceredrawing.Accordingtovariousoperations,thisfunctionmakesadecisionwhethertheinterfaceneedstobechanged.Wetakethistaskasanindependentmodule.Task16,taskforGPSdatacollecting.Itcollectsthelatitudeandlongitudeinformationofthewheelloadertimingandsendtothemaincontroller.Iftheremotemonitoringisneeded,theinformationwillbesenttotheremotemonitoringthroughthemaincontrollerbasedonGPRSifitisneeded.Andthevehiclesrealtimepositionalinformationwillbe4827AuthorizedlicenseduselimitedtoJILINUNIVERSITY.DownloadedonDecember17,2008at0608fromIEEEXplore.Restrictionsapply.

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