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

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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，Whenthecurrentta