硬件调试方式Hardware debug mode.docx
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硬件调试方式Hardware debug mode.docx
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硬件调试方式Hardwaredebugmode
硬件调试方式(Hardwaredebugmode)
Debuggingsteps
Thedebuggingstepsofelectroniccircuitsareasfollows:
blockdebuggingorintegraldebugging:
1.checkcircuit
Anyassemblyofelectroniccircuits,beforecommissioning,mustcarefullycheckwhetherthecircuitwiringerror.Controlcircuitdiagram,accordingtoacertainordercorrespondinginspectionstepbystep.
Specialattentionshouldbepaidtocheckwhetherthepowersupplyisconnectedtoapowersourceandgroundfault,whetherthereisashort-circuit,whetherthepolarityoftheelectrolyticcapacitoranddiodeconnectedinreversedirection,theintegratedcircuitandthetransistorpiniswrong,gentlypullapullcomponents,solderjointisfirm,etc..
Observationof2.passes
Besuretodebugtherequiredpowervoltagevalue,anddeterminethecircuitboardpowersupplywithoutshort-circuitphenomenon,thecircuitcanbeconnectedtothepowersupply.Oncethepowerisconnected,don'tbeeagertoobservethewaveformanddatawiththeinstrument,buttoobservewhetherthereareabnormalphenomena,suchassmoke,abnormalsmell,dischargeofsoundandlight,componentsburning,etc..Ifthereis,don'tpanic,butshouldimmediatelyturnoffthepowersupply,untilthetroubleshootingcanbereconnectedtothepowersupply.Then,thevoltageofthepowersupplypinofeachintegratedblockismeasuredtodeterminewhethertheintegratedcircuitisenergized.
3.staticdebugging
NoinputsignalisusedtomeasurewhethertheDCoperatingvoltageandcurrentarenormalatalllevels.Directcurrentvoltagetestisveryconvenientandcanbemeasureddirectly.Andthemeasurementofcurrentisnotveryconvenient,usuallyusingtwomethodstomeasure.Ifthecircuithasabreakpointontheprintedcircuitboard,itcanbeconnectedtotheammetertomeasurethecurrentvaluedirectly,andthenconnectitwithsolder.Ifthereisnotesthole,theDCvoltagecanbemeasured,andthentheDCcurrentiscalculatedaccordingtothevalueoftheresistance.Thestaticpointdebuggingoftransistorsandintegratedcircuitsisgenerallycarriedout.
4.dynamicdebugging
Withtheinputsignal,theoutputsignaloftheobservationcircuitmeetstherequirements.ThatistoadjustthecircuitACchannelcomponents,suchascapacitance,inductance,etc.,sothatthecircuitrelatedpointoftheACsignalwaveform,amplitude,frequencyandotherparameterstomeetthedesignrequirements.Iftheinputsignalisaperiodicchangesignal,theoutputsignalcanbeobservedbyoscilloscope.Whenblockdebuggingisadopted,theinputsignalshouldbeusedbeforetheinputstage,exceptfortheinputsignal.Foranalogcircuits,observetheoutputwaveformisinlinewiththerequirements.Fordigitalcircuits,theobservedoutputsignalwaveform,amplitude,pulsewidth,phaseanddynamiclogicalrelationshipareinlinewiththerequirements.Inthedebuggingofdigitalcircuits,itisoftenhopedthatthestateofthecircuitcanbechangedatonetimeinsteadofperiodically.Therefore,theinputsignalforsinglestepsignals(alsocalledsignalswitch),logiccircuitinordertoobservethechangeofstate.
5.indextest
Afterthestaticanddynamicdebuggingofelectroniccircuitisnormal,thetechnicalindexofthesubjectcanbemeasured.Testandrecordthetestdata,analyzethetestdata,andfinallymakethetestconclusiontodeterminewhetherthetechnicalspecificationsofthecircuitmeetthedesignrequirements.Ifthereisanydiscrepancy,theproblemshouldbecarefullychecked,andtheparametersofsomecomponentsshouldbeadjustedandchanged.Ifitstillfailstomeettherequirements,apartofthecircuitshouldbemodified,andeventhewholecircuitshouldbemodifiedagain.Therefore,inthewholeprocessofdesign,weshouldbecarefulandcareful,andconsidertheproblemmorecomprehensively.Evenso,localreworkisinevitable.
AARMhardwaredebugginginstructionsforusers
ARMhardwaredebugging
Intheonlinetime,seealotofpeopleaskhowtodotheirownARMboard,andsomepeoplewanttocontactfriendstodotogether.Nomatterwhatkindofwaytodoit,IhopeIcanmakeaARMtoplaywithmyself.Personally,it'snotdifficulttomakeaARMboard.ThedifficultyisinthepurchaseofcomponentsandPCBprocessing.Butthesetwopartsarealsoverygoodsolution.Todoasimple,theirownlearningboard,thecostisonlythree,fourhundredbucks.Notonlycost-effective,butalsoenjoythefun.
First,schematicdesign
Firstofall,youhavetothinkaboutwhatkindofboardyou'regoingtomake,
Isitforaproject,orforalearningboard?
.Clearthepurpose,startdesignschematics.Atpresent,ourcommonlyusedARMdevelopmentboardismostlySamsung,alsohasPHILIPS.ThesetwokindsofchipscanbefoundveryrichresourcesontheInternet,includingtheprinciplediagramandtestprocedures,especiallythe44B0chipdataisalmostnetfulfly.Findaschematicdiagramofthechip,onthebasisofsomechangestomakeitmoresuitablefortheirownpracticalapplications.ARM7chipswillbealittleeasiertouse,afterall,theprincipleofthestructureandtheordinary51microcontrollersomewhatsimilar,donotneedtoomuchtroubletocomplete.ForARM9,thedesigndiagramwillbetroublesome.Recommendedcoreboard,theARMchipandthememoryonasmallplate,andthenthefloor,sothatevenifthedesignisaproblem,isalsoconvenienttomodifythedesign.
TheprincipleoffigureIdonotwordy,alotofonlinereferencemap,DOWNthemtomodifyit,determinetheprinciplediagramiscorrect,youneedtostartthelayout.
ForARM7,thekindofrelativelylowspeed(below100M),aslongastheplateclothcanbeappropriate,notwhatparticularlynoteworthy,somesignallinemaybeonsomesmallresistance,highfrequencyresistancematch.
FortheARM9board,atleast4laminatesarerequired.(ifbothsidescanlinecloth,doublesidedplatecanalsobe).Here,onemightaskifthe4boardsareenough.Ithinkit'squiteenough.IdesignedaS3C2410coreboard,madewith4boards,canworknormallyunder200M.Inaddition,Igota6boardPCBfromtheInternet,andIchangeditinto4boards.Ididn'thavethetimetodebug,andIguessitwasn'taproblem.WhydoIsaythat,becauseyoucanprobablyknowsomethingabouttheentirecircuit,andaslongasyourboardhandlesthepowerandclockproperly,otherlogicsignalsarenottoobig.Ofcourse,thepremiseisthatlogicalsignalscannotberandomlydistributed.
Hereneedtoexplainabit,do4boardsentirelyfortheirownlearning,becausethepriceofthe6boardistoohigh,theindividualcannotafford.Butifyou'regoingtodoindustrialequipmentorpracticalprojects,oruse6laminates,sothatitcanplayacertainroleinthehardwareprotection.
Two,PCBprocessing
Aftertheboardiswelldistributed,itwillbeprocessedoutside.Ifyou'reacompanybuildingaboard,youdon'thavetoopenthispart.Individualscancontinuetolookattheplate.
Lookingformanufacturerstodosomeoftheskillsoftheboard.Saydoubledeckfirst.Doublesidedpanelscanbedonebyordinarymanufacturers,andthedistancebetweenthewireandthechipofARM7isthesameasthedistancebetweenthepins.Alittlewider,better.Pricesaregenerallynotveryexpensive,and200piecesofRMBareenoughtomake5boardsforyoutodebug.ThepricesinBeijingandShenzhendon'tseemquitethesame.InShenzhen,itseemstobeabout600oftheprojectcost,andthenbytheareacalculation.Beijingisdirectlycalculatedbythearea,thetotalpriceneedstobemorethan100,lessthan100ofthe100count.Atthesametime,Beijingcanalsocustomizeplatemethod,suchastheboarddoesnotaddsilkscreen,notgold-platedtoreduceprices.Inanycase,aslongaspatiencetofind,youcanalwaysfindasuitablefortheirownmanufacturerstodotheboard.Ofcourse,therearealsosomemanufacturerslowprices,qualitywillbeabitpoor,goodboardbacktocheckcarefully,itwillnotaffectourtest.WhenIwaswithanotherclassmatefor04years,Iused150piecesofmoneytomake3boardsinBeijing.Therewasnoscreenprinting,noedgemilling,onlytinplating.Comebackanddealwiththeboardyourself.Checkoutashortcircuit(theboard,ourclothlineistoosmall,linedistanceisverysmall,itislaterlearned).Therepairedplateisstableafterrepair.
Moreplywood.ThelaminateisgenerallyusedfortheBGApackage,checkwhenitisnoteasytocheck,andwecannotseetheinnerwiring,needtochoosesometrustedmanufacturersinthefactory,itisbesttodoflytestfactory.Thecostofmakinga4boardisabout1000~2000,
Individualmanufacturersmaybemorethan2000,butthatkindofmanufacturercanguaranteetoyourplateabsoluteOK,sometimesforthequalityoftheboard,alsoneedtosacrificeabitofmoldfee.Generally,afteryoupayenoughmoney,themanufacturercangiveyouafewmodelsfreeofcharge,ifyouwanttohavemorethanafewboards,youmustadvancetothemanufacturerssay,theymayreceivealittlemoney,ormaynotreceivemoney.Lookatyournegotiatingskills.Becausehe'sdoingthesameplateatonetimeand30boardsatthesameprice.
Boardshouldpayattentionto,aftertakingback,needtocarefullycheck,foundthattheshortcircuitneedtorepairinplace.Wherethereisnoprocessingboard,youcanconsideronlinecustom-made.Theycanmailittoyouafterthey'refinished,andtheyneedtotalkaboutitontheirown.
Three,thepurchaseofcomponents
It'seasytobuycomponents.Ofcourse,youhavetofindtherightsource.InBeijing,chipscanbefoundinZhongguancun.Componentssuchasresistorsandcapacitorscanalsobesoldre
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