基于STM32的数据采集系统英文文献.docx

基于STM32的数据采集系统英文文献.docx

《基于STM32的数据采集系统英文文献.docx》由会员分享，可在线阅读，更多相关《基于STM32的数据采集系统英文文献.docx（10页珍藏版）》请在冰豆网上搜索。

基于STM32的数据采集系统英文文献

基于STM32的数据采集系统英文文献

DesignoftheDataAcquisitionSystemBasedonSTM32

ABSTRACT

Earlydetectionoffailuresinmachineryequipmentsisoneofthemostimportantconcernstoindustry.Inordertomonitoreffectiveofrotatingmachinery,wedevelopmentamicro-controlleruC/OS-IIsystemofsignalacquisitionsystembasedonSTM32inthispaper.wehavegiventhewholedesignschemeofsystemandthemulti-channelvibrationsignalinaxisX,YandZoftherotaryshaftcanbeacquiredrapidlyanddisplayinreal-time.Oursystemhasthecharacterofsimplestructure,lowpowerconsumption,miniaturization.

Keywords:

STM32;dataacquisition;embeddedsystem;uC/OS-II;

1.1.Introduction

Thereal-timeacquisitionofvibrationinrotatingmachinerycaneffectivelypredict,assessanddiagnoseequipmentoperationstate,theindustrygetsvibrationdataacquisitionRapidlyandanalysisinreal-timecanmonitortherotatingmachinerystateandguaranteethesaferunningoftheequipment.Inordertopreventfailure,reducemaintenancetime,improvetheeconomicefficiency,Thepurposeoffaultdiagnosissystemcandetectthesedevicesthroughthevibrationsignalacquisitionofrotatingmachinery,andprocessthedataacquisition,thenitwillmaketimelyjudgmentofrunningstateofequipment.Whilethedataacquisitionmoduleisthecorepartofthefaultdiagnosissystem[1-4].Thepracticalapplicationintheindustrialfield,istheequipmentoperatingparameterswillbeacquiredtomonitorequipmentoperatingstate.Intraditionaldataacquisitionsystems,thedatafromacquisitioncardaregenerallysendintothecomputer,andspecificsoftwarewillbedevelopedforthedataacquisition.ThemaincontributionofthispaperhasdesignedtheSTM32platformwithARMtechnology,thathasbecomeatraditionalmainstreamtechnologyinembeddedsystems,andthecollectingdatatowardthedirectionofhighreal-time,multi-parameter,high-precision,whiledatastoragebecomelargecapacity,moreminiaturizationandportable,andthedevelopmentofmulticommunicationmodeandlong-distancefordatatransmission.Soastomeettheactualacquisitionsystemmultitaskingrequirements,thisarticlehasdesignedbasedonSTM32micro-controlleruC/OS-IIsystemofsignalacquisitionsystem.Therefore,inordertomeettheactualacquisitionsystemmultitaskrequirements,thisnoveltyofthisarticlehasdesignedasignalacquisitionsysteminmicro-controlleruC/OS-IIbasedonSTM32.

2.Architectureofdataacquisitionsystem

Dataacquisitionaskeytechnologyformonitoringequipment,recentlyalotofworkhasbeendoneonit.AnembeddedparalleldataacquisitionsystembasedonFPGAisOptimizeddesignedwhichwillmakeitreasonabletodivideandallocatehigh-speedandlow-speedA/D[5].Instead,ithasuseahigh-speedA/D

converterandStratixIIseriesofFPGAfordatacollectionandprocessing,inwhichthemaincontributionisusedoftheCompactPeripheralComponentInterconnect,thesystemhasthecharactersofmodularization,sturdinessandscalability[6].ButremotecontrolwillbeneededinSpecialConditions,thispaperintroducetheembeddedoperatingsystemplatformbasedonWindowsCEanduC/OS-IItodesignaremoteacquisitionandcontrolsystemwiththeGPRSwirelesstechnology[7-8].Inordertoachievethedatasharingofmulti-user,ithasbuildtheembeddeddynamicwebsitefordataacquisitionmanagementanddisseminationwiththeARM9andLinuxoperationsystem[9].AdatacollectionterminaldevicesisdesignedbasedonARM7microprocessorLPC2290andembeddedreal-timeoperatingsystemuC/OS-IItosolvethereal-timeacquisitionofmultichannelsmallsignalandmulti-channeltransmission[10].Ontheotherhands,twoparallelDSP-basedsystemdedicatedtothedataacquisitiononrotatingmachines,andtheinnersignalconditionerisusedtoadaptthesensoroutputtotheinputrangeoftheacquisition,andthensignalpost-processingbythedesignsoftware,whilethemostfrequentlystructureistouseDASandFPGA-based,andsuchprogramsarealsodependentontheDAScost.

Inordertomeetmarketrequirementsoflowpowerconsumption,lowcost,andmobility,Fig.1inthispaperpresentsthedesignoverallstructurediagramofdataacquisitionsystem.ThroughSPIinterface,thesystemgetsthedatacollectionwiththreeaxisaccelerationsensorintotheSTM32controllerofinnerA/Dconversionmodulewith12-bit,thisprocessisnon-interferingparallelacquisition.Oursystemuses240x400LCDandtouchscreenmodulereal-timetodisplaythecollecteddatainrealtime.

2.1.STM32micro-controller

A32bitRISCSTM32F103VET6,usedastheprocessorinoursystem,comparedwithsimilarproducts,theSTM32F103VET6workat72MHZ,withcharactersofstrongperformanceandlowpowerconsumption,real-timeandlow-cost.Theprocessorincludes:

512KFLASH,64KSRAM,anditwillcommunicatebyusingfiveserialportswhichcontainaCANbus,aUSB2.0SLAVEmodeandaEthernetinterface,whatsmoretwoRS232portsarealsoincluded.ThesysteminourpaperextendtheSST25VF016BserialmemorythroughtheSPIbusinterface,thatwillregardasthetemporarystoragewhencollectlargenumberofdata,furthermore,wehavetheA/Dconverterwith12bitsresolution,andthefastestconversionupto1us,with3.6Vfull-scaleofthesystem.Inadditiontodesignofthesystempowersupplycircuit,theresetcircuit,RTCcircuitandGPIOporttoassurancesystemneedsandnormaloperation.

2.2.Dataacquisition

Themachinestateisnormalornotismainlydependedonthevibrationsignal.Inthispaper,toacquirethevibrationdataofrotatingmachineryrotor,wehaveusedvibrationaccelerationtransducersMMA7455Lwhichcouldcollectthedatafromaxisx,y,andzofthecompanyofFree-scale.Thekindofvibrationaccelerationtransducershasadvantageoflowcostandsmallsize,highsensitivityandlargedynamicrangewithsmallinterference.MMA7455Lismainlyconsistsofgravitysensingunitandsignalconditioningcircuitcomposition,andthissensorwillamplifythetinydatabeforesignalpreprocessing.Indataacquisitionprocessofoursystem,theerrorofsamplingstageismainlycausedbyquantified,andtheerrorisdependedonthebitsoftheA/Dconverter,whenweregardthemaximumvoltageasVmax,theADconverterbitsisn,andthequantizationQ=Vmax/2n,then,thequantizationerrorisobeyeduniformdistributionin[-q/2,q/2][13].

ThedesignedSTM32couldbuiltatmostthree12-bitparallelADCinthispaper,whichtheoreticalindexis72dBandtheactualdynamicrangeisbetween54to60dBwhile2or3bitsisimpactedbynoise,thedynamicrangeofmeasurementcanupto1000timeswith60dB.Forthevastmajorityofthevibrationsignal,themaximumsamplingrateof10kHZcanmeetactualdemand,andthehigherfrequencyofcollectionisgenerallyusedinthe8-12bitsAD,thereforeoneofcontributionofthisworkistochooseabuilt-in12-bitA/Dtomeettheaccuracyofvibrationsignalacquisitionandlowercostinthisexperiment.

3.Softwaredesign

3.1.TransplantationofC/OS

Inordertoensurereal-timeandsafetydatacollectionrequirements,inthissystem,akindofRTOSwhosesourcecodeisopenandsmallisproposed.Italsocanbeeasilytobecutdown,repottedandsolidified,anditsbasicfunctionsincludingtaskmanagementandresourcemanagement,storagemanagementandsystemmanagement.TheRTOSembeddedsystemcouldsupport64tasks,withatmost56usertasks,andfourtasksofthehighestandthelowestprioritieswillberetainedinsystem.TheuC/OS-IIassignsprioritiesofthetasksaccordingtotheirimportance,theoperationsystemexecutivethetaskfromtheprioritysequenceandeachtaskhaveindependentpriority.Theoperatingsystemkernelisstreamlined,andmulti-taskingfunctioniswellcomparedwithothers,itcanbetransplantedtoprocessorsthatfrom8-bitto64-bit.Thetransplantinthesystemaretomodifythethreefilesystemstructure:

OS_CPU_C.HOS_CPU.C,OS_CPU_A.ASM.Maintransplantationprocedureisasfollows:

A.OS_CPU_C.H

Ithasdefinedthedatatypes,thelengthandgrowthdirectionofstackintheprocessor.Becausedifferentmicroprocessorshavedifferentwordlength，sotheuC/OS-IItransplantationincludeaseriesoftypedefinitiontoensureitsportability,andtherevisedcodeasfollows:

typedefunsignedcharBOOLEAN;

typedefunsignedcharINT8U;

typedefsignedcharINT8S;

typedefunsignedshortINT16U;

typedefsignedshortINT16U;

typedefunsignedintINT32U;

typedefsignedintINT32S;

typedeffloatFP32;

typedefdoubleFP64;

typedefunsignedintOS_STK;

typedefunsignedintOS_CPU_SR;

Cortex-M3processordefinestheOS_ENTER_CRITICAL（）andOS_EXIT_CRITICAL（）asopeningandclosinginterrupt,andtheymustsetto32bitofthestackOS_STKandCPUregisterlength.Inaddition,thathasdefinedthestackpointerOS_STK_GROWTHstackgrowthdirectionfromhighaddresstoloweraddress.

B.OS_CPU.C

TomodifythefunctionOSTaskStkInit（）accordingtotheprocessor,thenineremaininguserinterfacefunctionsandhookfunctionscanbenullwithoutspecialrequirements,theywillproducecodeforthesefunctionsonlywhentheOS_CPU_HOOKS_ENissetto1inthefileofOS_CFG.H.ThestackinitializationfunctionOSTaskStkInit（）returntothenewtopofthestackpointer.

OS_CPU_A.ASM

Mostofthetransplantworkarecompletedinthesedocuments,andmodifythefollowingfunctions.

OsStartHighRdy（）isusedforrunningthemostpriorityreadytask,itwillberesponsibleforstackpointerSPfromthehighestprioritytaskofTCBcontrolblock,andrestoretheCPU,thenthetaskprocesscreatedbytheuserstarttocontroltheprocess.

OSCtxSw（）isfortaskswitching,