外文翻译原文-基于MSP430和nRF2401的低功率无线通信系统的设计

DesignofLow-powerWirelessCommunicationSystemBasedonMSP430andnRF2401ZhangYanbingSchoolofInformationandCommunicationEngineering,NorthUniversityofChina,Taiyuan,Shanxi,030051,Chinazhybg_1126AbstractAccordingtomonitorrequirementaboutcontactlesstransfer,thispaperdesignedalow-powerwirelesscommunicationsystembasedon16bitMSP430F1611andnRF2401.Itintroducedthesystemstructureandthedesignofhardwareandsoftwareindetail.Thesystemrealizedthefunctionsofreal-timedataacquisition,wirelesstransmissionandcommunicationonmicrocomputerwiththehelpofnRF2401.Ithasthecharacteristicsoflowcost,lowpower,dependableperformanceetc.Keywords-MSP430;low-power;wirelesscommunication;nRF2401I.INTRODUCTIONIncontrolsystem,bothsignalsandinstructionsdemandelectrontransfer.Ineverydaylifeandproduction,thesedataaremostlytransmittedbytwisted-pair,coaxial-cableandopticalfiber1.However,thistransmissionneedswiringandconstruction,anditoftencauseselectromagneticinterferenceandsignalattenuation2,3.Besides,whenthetestpointismovingorlayingcablesisnotallowedinindustrialcircumstances,achievingdatacontactlesstransferbywirelesscommunicationtechnologyisdemanded4.Thispaperintroducedawirelesscommunicationsystembasedon16bitMSP430F1611fromAmericanTICompanyandnRF2401fromNORDICcompanyinNorway,bywhichthedatasbidirectionalwirelesstransmissionisrealized.Thisdeviceespeciallyappliestolow-costandlowpowerwirelesscommunicationsystem,andithasawidespreadprospect.II.DESIGNOFSYSTEMHARDWARECIRCUITA.ThesystemstructureandtheworkingprincipleThewirelesscommunicationsystemincludesdataacquisitionmoduleandsystemmonitoringmodule.TheMSP430isthecoreofdataacquisitionmodule,andcontrolthismodulethroughtheprograminit.MonitoringmoduleincludesPCandsinglechip.TheMAX232mainlycompletelevelchangesfromRS232toTTL.AndRS232isthecommunicationinterfacebetweensinglechipandPC.ThewirelesscommunicationsystembetweenthetwomodulesisbuiltbywirelesscommunicationchipnRF2401,whichacceptsdataortheorderonsinglechip,receivesandsendsdatabytheantenna,andexchangesinformationbetweentwomodules.Thesystemblockdiagramisshowninfigure1.B.16bitultralowpowersinglechipMSP430F1611SinglechipMSP430isalow-powerMixedSignalProcessorproducedbytheAmericancompanyTI,whichhasaboundingperipheralinteriorlyandflexibledevelopmenttool.ThevoltageofMSP430F1611rangesfrom1.8to3.6V.280Aiscostintheactivemode,1.6Ainthestandbymode,and.0.1Ainoffmode.Itintegrates12bitA/Dconverter,comparator,D/Aconverter,timer,serialcommunicationinterface,watchdog,vibrator,lotsofI/Oportand48KB+256Bflashmemoryand10KBRAM.MSP430F1611has5kindsofsaveelectricitymodesbesidesitsnormalmode.Inordertomeettherequirementsoflowpowerconsumption,CPUwillcometoenergysavingmodeafterithasfinishedcontroltask.Thereforethesystemappliestohighintegration,lowpowerandlowcostcircumstance5.C.Singlechip2.4GHztransceivernRF2401nRF2401is2.4GHztransceiverfromNordiccompanyinNorway,whoseworkingfrequencybandis2.42.5GHzISM,whichmakeitbeapplicabletoglobalwirelessmarket6.Themajorcomponentsandpartshavefrequencysynthesizerpoweramplifier,crystaloscillator,modulatorandstandardSPIect.Theoutputpowerandcommunicationchannelcanbeconfiguredbysoftware.Itcanuse125communicationFigure1.Thesystemblockdiagram2010InternationalConferenceonMeasuringTechnologyandMechatronicsAutomation978-0-7695-3962-1/10$26.002010IEEEDOI10.1109/ICMTMA.2010.4101008Figure2.SchematicofMSP430F1611andnRF2401channelsandthetoptransmissionspeedisupto1Mb/s,soitisfasterthanthatofBluetooth.TheworkingvoltageofnRF2401is1.93.6V,whichislowpowerdevice.Whenitisconductedatthepowerof-5dBm,theworkingcurrentis10.5Ma,whilethereceivecurrentisonly18mA.DesignedbyadoptingSOCmethod,thisdeviceonlydemandsafewofperipheralequipmenttomakeupRFtransceivercircuit.BecausernRF2401ischeaperthanBluetoothproducts,nocomplicatedcommunicationagreement,cleartoconsumersandfreetocommunicatewithintheproductsofatype,itiswidelyusedinlowpower,high-integrationwirelesscommunicationsystem7.Therearefourkindsofworkingmodes:transceivermode,configuremode,idlemodeandoffmode.Thesemodescanbeconfiguredthroughthreepins:PWR_UP,CEandCS,whichisshowninTABLE1:TABLEI.RF2401OPERATINGMODEoperatingmodePWR_UPCECStransceivermode110configuremode101idlemode100Offmode0WiththethreepinsofCS,CLK1andDATA,nRF2401canbeconfiguredtoShockBurstTMTransceiverModeorDirectTransceiverMode.ThispaperadoptedShockBurstTMTransceiverMode,whichhasthefuturesofsimpleprogramandhighstability8.D.CentralcircuitThediagramofinterfacecircuitbetweenMSP430F1611andnRF2401isshowninFigure2,inwhichP1.0,P1.1,P1.2,P1.3,P3.3areconnectedtoPWR_UP,DR1,CE,CSandCLK.Thethreepins,P1.0,P1.2andP1.3,aredesignedtochoosetheoperatingmode;P1.1isforinterruptmode.P3.3issynchronousclocksignalprovidedbyMCU;thedataoperatedinSPIpatternaretransmittedtoSIMOP3.1andSOMIP3.2ofMCUbyresistance,soitachievesSPIcommunication9.III.DESIGNOFSYSTEMSOFTWAREThesystemsoftwareisprogrammedwiththedevelopmentofIAREmbeddedWorkbench,includingcomputermonitoringmodule,dataacquisitionandtransmittermoduleandsinglechipreceivermodule.Inordertolowerpowerconsumption,eachmoduleshouldbeinitializedwhenthepowersupplyisturn-onandthengointolowpowermode,LPM3.AfterPMWKUPisreceived,thesystemperformsdataacquisition,processing,storing,receivingandsending.Whenthewholeoperationisfinished,wirelessmodulegoesintointerceptionmodeandlowpowermode.A.DataacquisitionandtransmittermoduleFigure3showsthemainsoftwareflowchartofdataacquisitionandtransmittermodule.Firstofall,themoduleshouldbeinitialized,forexample,I/Oportinitialization,wirelesschipconfigure,openingTimerandexteriorinterruption.Whenthesystemreceivestheexteriorinterrupt,itgoesintointerruptservicingsubroutine,performingdataacquisitionandwirelesstransmit.TheinterruptservicingsubroutineflowchartisshowninFigure4.Figure3.ThemainprogramflowchartofdataacquisitionandtransmittermodulestartinitializationnRF2401isreceiverwaitforinterruptLPM3modeYNstartstartA/DconverternRF2401istransmittertransmitdatafinish?RETFigure4.Theinterruptsubroutineflowchart1009B.SinglechipreceivermoduleFigure5showstheflowchartofsinglechipreceivermodule.Themodulemainlyperformsdatareceivinganduploadinganditisinitializedlikedataacquisitionandtransmittermodule.Whenitreceives,dataacquisitionandtransmittermoduleshouldbewakenup,thenreceivingdataandstoringtheminRAM.ThesedataareuploadedtoPCatlast,andcanbeprocessed,displayedandprinted.C.ComputermonitoringmoduleComputermonitoringmoduleadoptsVB6.0program,transmittinginformationbetweenMSP430andPCbyRS232.MSCommofVB6.0offersstandardeventhandler,eventsandmethods,andachievesMSCOMMefficiently.Itsfunctionsincludereal-timedataexchangewithMSP430,showingeachtestedparameter,conductingdatastoring,processingandprinting.IV.CONCLUSIONSInthispaper,awirelesscommunicationsystemisdesignedbasedonMSP430F116andnRF2401chip.Itrealizedthefunctionsofreal-timeacquisitionmeasurement,wirelesstransmissionanddataupload,andputforwardforremotedataacquisitionsystemaconvenientwirelessdatatransmissionmethod.Thissystemhasthefeaturesofsmallvolume,convenienttototeandmeasure,strongstability,highprecisionandfavorableapplyforeground.Soitcanbeusedformanyfieldsasabasicmode.ACKNOWLEDGMENTOnthecompletionofmypaper,Ishouldliketoexpressmydeepestgratitudetoallthosewhosekindnessandadvicehavemadethisworkpossible.IamgreatlyindebtedtomyColleagueMr.Liangwhogavemevaluableinstructionsandhasimprovedmeinlanguage.Hiseffectiveadvice,shrewdcommentshavekeptthepaperintherightdirection.IwouldliketothankmypartnerMr.Wangforhisfriendshipandconstructivesuggestions.TheyconstantlyencouragedmewhenIfeltfrustratedwiththisdissertation.REFERENCES1WangXiaolei,WuBirui,JiangQun,WuBingxin.DesignofGasDensityMonitorandWirelessTransmissionSystemBasedonMSP430.InstrumentTechniqueandSensor.2009(04):76-80.(inChinese)2RenKai,LiangQinghua.DesignofPortableECGMonitorBasedonnRF2401.JournalofLiaoningInstituteofTechnology.2007(06):362-364.(inChinese)3ChenLijuan,ChangDanhua.WirelessDataCommunicationBasedonnRF2401.ChineseJournalOfElectronDevices.2006(01):248-250.(inChinese)4ZhangBiao,HuHui,SunChengguangAdesignofwirelessdataacquisitionmodulebasedon