基于STM32的数据采集系统英文文献Word文档下载推荐.docx

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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.

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。

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（）isusedforrunningthemostpri