FPGA Module How-To - documentation.help · LabVIEW FPGA Module installed. Communicating with FPGA...

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FPGA Interface June 2008, 371107E-01 The FPGA Interface provides programming features and functions to help you communicate with VIs or bitfiles that run on National Instruments FPGA targets, such as National Instruments Reconfigurable I/O (NI-RIO) devices. The VI that runs on the FPGA target is called the FPGA VI. The VI you use to communicate with FPGA VIs or bitfiles is called the host VI. The host VI can run on PCs or RT targets. The FPGA Interface is available with FPGA target driver software. You can use the FPGA Interface functions in a host VI if you have an FPGA target and the appropriate driver software. You do not need the LabVIEW FPGA Module to use the FPGA Interface functions. You need the FPGA Module if you want to develop FPGA VIs. To view related topics, click the Locate button, shown at left, in the toolbar at the top of this window. The LabVIEW Help highlights this topic in the Contents tab so you can navigate the related topics. © 2003–2008 National Instruments Corporation. All rights reserved.

Transcript of FPGA Module How-To - documentation.help · LabVIEW FPGA Module installed. Communicating with FPGA...

Page 1: FPGA Module How-To - documentation.help · LabVIEW FPGA Module installed. Communicating with FPGA VIs (FPGA Interface) This book provides functions and procedures that enable host

FPGAInterfaceJune2008,371107E-01TheFPGAInterfaceprovidesprogrammingfeaturesandfunctionstohelpyoucommunicatewithVIsorbitfilesthatrunonNationalInstrumentsFPGAtargets,suchasNationalInstrumentsReconfigurableI/O(NI-RIO)devices.TheVIthatrunsontheFPGAtargetiscalledtheFPGAVI.TheVIyouusetocommunicatewithFPGAVIsorbitfilesiscalledthehostVI.ThehostVIcanrunonPCsorRTtargets.TheFPGAInterfaceisavailablewithFPGAtargetdriversoftware.YoucanusetheFPGAInterfacefunctionsinahostVIifyouhaveanFPGAtargetandtheappropriatedriversoftware.YoudonotneedtheLabVIEWFPGAModuletousetheFPGAInterfacefunctions.YouneedtheFPGAModuleifyouwanttodevelopFPGAVIs.

Toviewrelatedtopics,clicktheLocatebutton,shownatleft,inthetoolbaratthetopofthiswindow.TheLabVIEWHelphighlightsthistopicintheContentstabsoyoucannavigatetherelatedtopics.

©2003–2008NationalInstrumentsCorporation.Allrightsreserved.

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UsingLabVIEWFPGAInterfacewithouttheFPGAModule(FPGAInterface)IfyouhaveanFPGAtarget,youcanusetheLabVIEWFPGAInterfaceVIsandfunctionstointerfacewithanFPGAbitfileevenifyoudonothavetheLabVIEWFPGAModuleinstalled.UsetheOpenFPGAVIReferencefunctiontoopenareferencetotheFPGAbitfile.YouthencanuseotherFPGAInterfacefunctions,suchasRead/WriteControl,InvokeMethod,andCloseFPGAVIReference,tointerfacewiththeFPGAbitfile.

NoteYoucanuseanuncompiledFPGAVIonlyifyouhavetheLabVIEWFPGAModuleinstalled.

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CommunicatingwithFPGAVIs(FPGAInterface)ThisbookprovidesfunctionsandproceduresthatenablehostVIstocommunicatewithFPGAVIs.

Toviewrelatedtopics,clicktheLocatebutton,shownatleft,inthetoolbaratthetopofthiswindow.TheLabVIEWHelphighlightsthistopicintheContentstabsoyoucannavigatetherelatedtopics.

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OpeningaReferencetoanFPGAVI(FPGAInterface)YoucancommunicatewithFPGAVIsorbitfilesrunningonFPGAtargetsusinghostVIs.HostVIscanrunonPCsorRTtargets.EachhostVImustopenareferencetotheFPGAVIorbitfilethatrunsontheFPGAtarget.YoucanopenareferencetoanFPGAVIinthesameLabVIEWprojectasthehostVI,oryoucanopenareferencetoabitfile.

NoteIfyouwanttoopenreferencestodifferentFPGAVIsorbitfilesononetarget,openonlyonereferenceatatime,andclosethereferencebeforeopeninganother.YoucanhavemorethanoneFPGAVIreferencesimultaneouslyopenonatarget,aslongasallthereferencescorrespondtothesameFPGAVIorbitfileonthesametarget.

TipTomakehostVIdevelopmentfaster,keeptheFPGAVIinmemory.

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OpeningaReferencetoanFPGAVICompletethefollowingstepstoopenareferencetoanFPGAVIinahostVI.YoucanopenareferencetoanFPGAVIifthehostVI,theFPGAtarget,andtheFPGAVIareinthesameproject.YoucannotopenareferencetoanFPGAVIifyoudonothavetheLabVIEWFPGAModuleinstalled.

1. Createanewprojectoropenanexistingproject.2. AddanFPGAtargettotheprojectorverifytheFPGAtarget

appearsintheProjectExplorerwindow.3. CreateanewFPGAVIorverifytheFPGAVItowhichyouwant

toopenareferenceappearsintheProjectExplorerwindowundertheFPGAtarget.

4. CreateanewhostVIoropenanexistinghostVIintheproject.ThehostVImustbeunderMyComputeroranRTtargetintheProjectExplorerwindow.

5. PlaceanOpenFPGAVIReferencefunctionontheblockdiagram.

Place Find6. DragtheFPGAVIyouwanttoopenareferencetofromthe

ProjectExplorerwindowtotheOpenFPGAVIReferencefunction.TheFPGAVIiconappearsintheOpenFPGAVIReferencefunction.IftheFPGAtargetintheprojectisassociatedwithaphysicaltarget,thetargetnameandresourceappearsundertheOpenFPGAVIReferencefunction.

7. (Optional)Right-clicktheOpenFPGAVIReferencefunctionandselectConfigureOpenFPGAVIReferencefromtheshortcutmenutodisplaytheConfigureOpenFPGAVIReferencedialogbox,whichyoucanusetoselectoptionsforopeningthereference.

8. (Optional)WireacontrolorconstanttotheresourcenameinputontheOpenFPGAVIReferencefunctiontospecifyanFPGAtargetonwhichtoruntheFPGAVI.

NoteYoumustplaceandwireaCloseFPGAVIReferencefunctionforeveryOpenFPGAVIReferencefunctioninahostVI.

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OpeningaReferencetoaBitfileCompletethefollowingstepstoopenareferencetoabitfileinahostVI.ThehostVIdoesnotneedtobeinaproject.

1. CreateanewhostVIoropenanexistinghostVI.IfthehostVIisinaproject,thehostVImustbeunderMyComputeroranRTtargetintheProjectExplorerwindow.

2. PlaceanOpenFPGAVIReferencefunctionontheblockdiagram.

Place Find3. Right-clicktheOpenFPGAVIReferencefunctionandselect

ConfigureOpenFPGAVIReferencefromtheshortcutmenu.4. SelecttheBitfileoptionintheConfigureOpenFPGAVI

Referencedialogbox.5. NavigatetothebitfileyouwanttoopenonanFPGAtarget.6. (Optional)UsetheConfigureOpenFPGAVIReferencedialog

boxtoselectadditionaloptionsforopeningthereference.7. ClicktheOKbutton.TheFPGAVIiconappearsintheOpen

FPGAVIReferencefunction.AfoldericonappearsintheupperleftcorneroftheOpenFPGAVIReferencefunctiontodenotethebitfile.

8. WireacontrolorconstanttotheresourcenameinputontheOpenFPGAVIReferencefunctiontospecifyanFPGAtargetonwhichtoruntheFPGAVI.

NoteYoumustplaceandwireaCloseFPGAVIReferencefunctionforeveryOpenFPGAVIReferencefunctioninahostVI.

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CommunicatingwithanFPGAVIRunningonaDevelopmentComputer(FPGAInterface)ThefollowinglistdescribesbehaviortoconsiderwhenyouuseahostVItocommunicatewithanFPGAVIthatisrunningonadevelopmentcomputerwithsimulatedI/O:

YoumustrunthehostVIonaWindowsdevelopmentcomputertocommunicatewiththeFPGAVI.YoucannotrunthehostVIonanRTtarget.ToexecutedifferentcodeonthehostVIbasedonwheretheFPGAVIexecutes,usetheInvokeMethodfunctionconfiguredfortheGetFPGAVIExecutionModemethod.TheUpCastfunctionandtheAbort,Reset,andDownloadmethodsontheInvokeMethodfunctiondonotsupportrunningtheFPGAVIonthedevelopmentcomputer.IfyouusetheUpCastfunctionorthesemethods,thehostVIreturnsarun-timeerror.DirectMemoryAccess(DMA)FIFOsarevalidwhileeitherthehostVIorFPGAVIarerunning.IfbothVIsstoprunning,DMAFIFOslosealldata.InterruptsarevalidonlywhentheFPGAVIisrunning.IftheFPGAVIstopsrunning,allinterruptdataislostandanyhostinterfacewaitsreturnimmediately.IfyouusetheInvokeMethodfunctiontoreadDMAFIFOs,thefunctionmighttimeoutmorefrequentlybecausetheFPGAVIisnotrunningasfastonthedevelopmentcomputerasitwouldonanFPGAtarget.YoumustclosethefrontpanelwindowoftheFPGAVIbeforerunningtheFPGAVIifyouwanttousetheCloseFPGAVIReferencefunctiontoclosethereference,stoptheFPGAVI,andresettheFPGAVIrunningonthedevelopmentcomputer.YoumustopenthefrontpanelwindowoftheFPGAVIbeforerunningtheFPGAVIifyouwanttousetheCloseFPGAVIReferencefunctiontoclosethehostreferencewithoutresettingtheFPGAVIrunningonthedevelopmentcomputer.

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UsingMultipleFPGAVIReferencesfortheSameTarget(FPGAInterface)IfyouwanttoopenreferencestodifferentFPGAVIsorbitfilesononetarget,openonlyonereferenceatatime,andclosethereferencebeforeopeninganother.YoucanhavemorethanoneFPGAVIreferencesimultaneouslyopenonatarget,aslongasallthereferencescorrespondtothesameFPGAVIorbitfileonthesametarget.YoucantakeadvantageofthisifyouwanttostructureanapplicationsothatdifferentpartsofthehostVIcommunicatewithcertainpartsoftheFPGAVI.ThehostVIaccessescertainresourcesfromtheFPGA.Theresourcescanincludecontrolsandindicators,logicalinterrupts,andDMAchannels.ThebestwaytopartitionthehostVIistoaccessoneoftheFPGAresourcesusingoneFPGAVIreference.TheonlytypeofaccessthatyoucanalwayssafelymakeusingmultipleFPGAVIreferencesisreadingofcontrolsandindicators.

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ReadingFPGAVIIndicators(FPGAInterface)CompletethefollowingstepstoreadanindicatorinanFPGAVIfromahostVI.TheFPGAVImusthavefrontpanelindicators.

1. OpenareferencetotheFPGAVIorbitfile.NoteTheFPGAtarget,FPGAVI,andhostVImustbeinthesameLabVIEWprojectifyouwanttoopenareferencetoanFPGAVI.ThehostVIdoesnotneedtobeinaprojectifyouopenareferencetoabitfile.

2. PlacetheRead/WriteControlfunctionontheblockdiagram.NoticethattheRead/WriteControlfunctioncontainsoneUnselectedinput.

Place Find3. WiretheFPGAVIReferenceOutparameteroftheOpenFPGA

VIReferencefunctiontotheFPGAVIReferenceInparameteroftheRead/WriteControlfunction.

4. ClicktheUnselectedinput.TheshortcutmenulistsallfrontpanelcontrolsandindicatorsintheFPGAVIintheControlssubmenu.

5. SelectanindicatoravailableintheFPGAVIfromtheshortcutmenu.NoticethattheUnselectedinputchangestoanoutputandreflectsthenameoftheindicatorintheFPGAVI.

ToreadmoreindicatorsintheFPGAVI,right-clicktheRead/WriteControlfunctionandselectAddElementfromtheshortcutmenuandthencustomizetheoutputasdescribedinthepreviousstep.YoualsocanclickthebottomlineoftheRead/WriteControlfunctionwiththePositioningtoolanddragthelinedowntoaddmorecontrolsandindicators.Thereadandwriteoperationsexecutesequentiallyfromtoptobottom.Also,iftheFPGAVIhassubVIsandyouwanttoaccesscontrolsandindicatorsonthesubVI,youmustwirethesubVIcontrolsandindicatorstothecontrolsandindicatorsoftheFPGAVIthatisusedintheOpenFPGAVIReferencefunction.

NoteYoualsocanreadFPGAVIcontrols.Toreadacontrol,right-clickthecontrolinputontheRead/WriteControlfunctionandselectChangetoReadfromtheshortcutmenu.

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WritingtoFPGAVIControls(FPGAInterface)CompletethefollowingstepstowritetoacontrolinanFPGAVIfromahostVI.TheFPGAVImusthavefrontpanelcontrols.

1. OpenareferencetotheFPGAVIorbitfile.NoteTheFPGAtarget,FPGAVI,andhostVImustbeinthesameLabVIEWprojectifyouwanttoopenareferencetoanFPGAVI.ThehostVIdoesnotneedtobeinaprojectifyouopenareferencetoabitfile.

2. PlacetheRead/WriteControlfunctionontheblockdiagram.NoticethattheRead/WriteControlfunctioncontainsoneUnselectedinput.

Place Find3. WiretheFPGAVIReferenceOutoutputoftheOpenFPGAVI

ReferencefunctiontotheFPGAVIReferenceIninputoftheRead/WriteControlfunction.

4. ClicktheUnselectedinput.TheshortcutmenulistsallfrontpanelcontrolsandindicatorsintheFPGAVI.

5. SelectacontrolavailableintheFPGAVIfromtheshortcutmenu.NoticethattheUnselectedinputchangestoreflectthenameofthecontrolintheFPGAVI.

TowritetomorecontrolsintheFPGAVI,right-clicktheRead/WriteControlfunctionandselectAddElementfromtheshortcutmenuandthencustomizetheinputasdescribedinthepreviousstep.YoualsocanclickthebottomlineoftheRead/WriteControlfunctionwiththePositioningtoolanddragthelinedowntoaddmorecontrolsandindicators.Thereadandwriteoperationsexecutesequentiallyfromtoptobottom.Also,iftheFPGAVIhassubVIsandyouwanttoaccesscontrolsandindicatorsonthesubVI,youmustwirethesubVIcontrolsandindicatorstothecontrolsandindicatorsoftheFPGAVIthatisusedintheOpenFPGAVIReferencefunction.

NoteYoualsocanwritetoFPGAVIindicators.Towritetoanindicator,right-clicktheindicatoroutputandselectChangetoWritefromtheshortcutmenu.

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ReadingDMAFIFOsfromHostVIs(FPGAInterface)YoucancreateDirectMemoryAccess(DMA)FIFOsinFPGAVIstotransferdatafromFPGAVIstohostVIs.SomeFPGAtargetsdonotsupportDMA.TheFPGAtargetsthatsupportDMAincludeafixednumberofDMAchannelsavailablefortransferringdatabetweentheFPGAVIandthehostVI.RefertothespecificFPGAtargethardwaredocumentationforinformationaboutthenumberofDMAchannelsavailable,iftheFPGAtargetsupportsDMA.CompletethefollowingstepstoreadaDMAFIFOinanFPGAVI.

1. OpenareferencetoanFPGAVIorbitfile.NoteTheFPGAtarget,FPGAVI,andhostVImustbeinthesameLabVIEWprojectifyouwanttoopenareferencetoanFPGAVI.ThehostVIdoesnotneedtobeinaprojectifyouopenareferencetoabitfile.IfyouopenareferencetoanFPGAVI,theprojectmustincludeaDMAFIFOitemundertheFPGAtargetandtheFPGAVImustincludeaFIFOWritefunctionontheblockdiagramthatwritestotheDMAFIFOitem.

2. PlaceanInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItoreadtheDMAFIFO.MakesurethehostVIrunstheFPGAVIbeforeyoureadtheDMAFIFO.WiretheFPGAVIReferenceIninput.

Place Find3. ClicktheInvokeMethodfunctionandselectFIFO»Readfromthe

shortcutmenu,whereFIFOisthenameoftheFIFOitemintheproject.Wiretheinputsandoutputsasneeded.TheReadmethodreturnsDatawhentheNumberofElementsisavailableorwhentheTimeoutperiodends.IftheTimeoutperiodendsbeforetheNumberofElementsisavailable,Datawillbeempty.TheElementsRemainingoutputcontainsthenumberofelementsremaininginthehostmemorypartoftheDMAFIFO.

4. PlacetheCloseFPGAVIReferencefunctionontheblockdiagram.

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Place Find5. WiretheFPGAVIReferenceOutoutputontheInvokeNodeto

theFPGAVIReferenceIninputontheCloseFPGAVIReferencefunction.

NoteYoucanreadDMAFIFOsusingonlytheInvokeMethodfunctionwiththeReadmethod.IfyouwantmorecontrolovertheDMAFIFOfromthehostVI,youalsocanconfigure,start,andstoptheDMAFIFOusingtheoptionalConfigure,Start,andStopmethodswiththeInvokeMethodfunction.

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WritingtoDMAFIFOsfromHostVIs(FPGAInterface)YoucancreateDirectMemoryAccess(DMA)FIFOstotransferdatafromhostVIstoFPGAVIs.SomeFPGAtargetsdonotsupportDMA.TheFPGAtargetsthatsupportDMAincludeafixednumberofDMAchannelsavailablefortransferringdatabetweenthehostVIandFPGAVI.RefertothespecificFPGAtargethardwaredocumentationforinformationaboutthenumberofDMAchannelsavailable,iftheFPGAtargetsupportsDMA.CompletethefollowingstepstowritetoaDMAFIFOinanFPGAVI.

1. OpenareferencetoanFPGAVIorbitfile.NoteTheFPGAtarget,FPGAVI,andhostVImustbeinthesameLabVIEWprojectifyouwanttoopenareferencetoanFPGAVI.ThehostVIdoesnotneedtobeinaprojectifyouopenareferencetoabitfile.IfyouopenareferencetoanFPGAVI,theprojectmustincludeaDMAFIFOitemundertheFPGAtargetandtheFPGAVImustincludeaFIFOReadfunctionontheblockdiagramthatreadstheDMAFIFOitem.

2. PlaceanInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItowritetotheDMAFIFO.WiretheFPGAVIReferenceIninput.

Place Find3. ClicktheInvokeMethodfunctionandselectFIFO»Writefromthe

shortcutmenu,whereFIFOisthenameoftheFIFOitemintheproject.Wiretheinputsandoutputsasneeded.TheWritemethodreturnsEmptyElementsRemainingwhenthedataiswrittenorwhentheTimeoutperiodends.

4. PlacetheCloseFPGAVIReferencefunctionontheblockdiagram.

Place Find5. WiretheFPGAVIReferenceOutoutputontheInvokeNodeto

theFPGAVIReferenceIninputontheCloseFPGAVIReferencefunction.

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NoteYoucanwriteDMAFIFOsusingonlytheInvokeMethodfunctionwiththeWritemethod.IfyouwantmorecontrolovertheDMAFIFOfromthehostVI,youalsocanconfigure,start,andstoptheDMAFIFOusingtheoptionalConfigure,Start,andStopmethodswiththeInvokeMethodfunction.

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UsingSubVIsinHostVIs(FPGAInterface)YoucanusesubVIsinhostVIsthatcommunicatewithFPGAVIsorbitfilesonFPGAtargets.However,ifyouchangetheconfigurationoftheOpenFPGAVIReferencefunctionortheUpCastfunction,LabVIEWdoesnotpropagatethechangestothesubsequentsubVIsinthedataflowunlessyoubindthereferenceoutputofthefunctiontoatypedefinition.CompletethefollowingstepstobindthereferenceoutputoftheOpenFPGAVIReferencefunctiontoatypedefinition.

1. Right-clicktheOpenFPGAVIReferencefunctiononthehostVIblockdiagramandselectConfigureOpenFPGAVIReferencefromtheshortcutmenu.

2. PlaceacheckmarkintheBindFPGAhostreferencetotypedefinitioncheckbox.TheSaveAsdialogboxappears.

3. TypeanameforanewtypedefinitionintheFilenametextboxornavigatetoanexistingtypedefinitionintheSaveAsdialogbox.IfyoutypeanameforthetypedefinitionintheFilenametextbox,LabVIEWcreatesthetypedefinitionforyou.

4. ClicktheSavebuttontoclosetheSaveAsdialogbox.5. ClicktheOKbuttontoclosetheConfigureOpenFPGAVI

Referencedialogbox.CompletethefollowingstepstobindthereferenceoutputoftheUpCastfunctiontoatypedefinition.

1. Right-clicktheUpCastfunctiononthehostVIblockdiagramandselectBindReferenceOutputtoTypeDefinitionfromtheshortcutmenu.TheSaveAsdialogboxappears.

2. TypeanameforanewtypedefinitionintheFilenametextboxornavigatetoanexistingtypedefinitionintheSaveAsdialogbox.IfyoutypeanameforthetypedefinitionintheFilenametextbox,LabVIEWcreatesthetypedefinitionforyou.

3. ClicktheSavebutton.LabVIEWnowautomaticallyupdatesthetypedefinitionyoucreatedwheneverchangestotheOpenFPGAVIReferencefunctionortheFPGAVInecessitatechangestothetypedefinition.LabVIEWalsopropagatesthesechangestoanysubVIsthatusethistypedefinition.This

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propagationallowsthesubVIstoremainconsistentwiththeOpenFPGAVIReferencefunctionorUpCastfunction.IfyoudonotbindtheoutputoftheOpenFPGAVIReferenceorUpCastfunctionstoatypedefinitionandyoumakeachangetotheconfigurationofeitherofthesefunctions,youmustmakethesamechangeinanysubVIsthatusethereferenceoutput.UsetheConfigureFPGAVIReferencedialogboxtoupdatethereference.

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SynchronizingFPGAVIsandHostVIsUsingInterrupts(FPGAInterface)SomeFPGAtargetsallowyoutogenerateinterruptsfromtheFPGAVItonotifythehostVIofevents,suchasdatabeingready,anerroroccurring,orataskfinishing.RefertothespecificFPGAtargethardwaredocumentationforinformationaboutwhethertheFPGAtargetsupportsinterrupts.

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WaitingforandAcknowledgingaSingleInterruptCompletethefollowingstepstowaitforandacknowledgeasingleinterruptinahostVI.

1. OpenareferencetotheFPGAVIorbitfilethatgeneratesinterrupts.

2. PlacetheInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItowaitforinterruptsfromtheFPGAVI.BesuretowiretheFPGAVIReferenceIninput.

Place Find3. Right-clicktheInvokeMethodfunctionandselectMethod»Wait

onIRQfromtheshortcutmenu.4. Right-clicktheIRQNumber(s)inputontheInvokeMethod

functionandselectCreate»Constantfromtheshortcutmenu.Youalsocancreateacontrol.

5. EnterthevalueofthelogicalinterruptyouselectedintheFPGAVI.

6. WiretheTimeoutinputifyouwanttospecifythemaximumtimethehostVIwaitsfortheinterruptbeforecontinuingthedataflow.Bydefault,thehostVIdoesnotwaitforaninterrupttooccurandreturnsonlyinterruptsalreadysetbytheFPGAVI.Youalsocanwireaconstantwithavalueof–1towaitindefinitelyforaninterrupt.IfyouusetheTimeoutinput,youcanusetheTimedOutoutputtodeterminewhetherthehostVIcontinueddataflowduetothetimeoutoccurringortothereceiptofaninterrupt.Ifatimeoutoccurs,theTimedOutoutputreturnsTRUE.

7. Right-clicktheIRQ(s)AssertedoutputontheInvokeMethodfunctionandselectCreate»Indicatorfromtheshortcutmenu.LabVIEWcreatesanumericindicator.Avalueof–1indicatesthattheinterruptwasnotreceived.

8. PlacetheInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItoacknowledgetheinterruptfromtheFPGAVI.PlacetheInvokeMethodfunctioninaCaseStructureifyouwantthefunctiontoexecuteonlywhenthehostVIreceivesaninterrupt.Ifyouwirea

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BooleanconstantofTRUEtotheWaitUntilClearedinputoftheInterruptVI,placetheInvokeMethodfunctioninthedataflowwhereyouwanttotelltheInterruptVItostopwaiting.BesuretowiretheFPGAVIReferenceIninputoftheInvokeMethodfunction.

Place Find9. Right-clicktheInvokeMethodfunctionandselect

Method»AcknowledgeIRQfromtheshortcutmenu.UsetheAcknowledgeIRQmethodtoacknowledgethelogicalinterruptreturnedbytheWaitonIRQmethod.

10. WiretheIRQ(s)AssertedoutputoftheWaitonIRQmethoddirectlytotheIRQNumber(s)inputoftheAcknowledgeIRQmethod.

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WaitingforandAcknowledgingMultipleInterruptsCompletethefollowingstepstowaitforandacknowledgemultipleinterruptsinahostVI.

1. OpenareferencetotheFPGAVIorbitfilethatgeneratesinterrupts.

2. PlacetheInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItowaitforinterruptsfromtheFPGAVI.BesuretowiretheFPGAVIReferenceIninput.

Place Find3. Right-clicktheInvokeMethodfunctionandselectMethod»Wait

onIRQfromtheshortcutmenu.4. PlaceanArrayConstantontheblockdiagram.Anarrayincludes

anindexdisplayontheleft,anelementdisplayontheright,andanoptionallabel.

Place Find5. PlaceaNumericConstantinthearray.

Place Find

6. UsingthePositioningtool,expandthearrayconstanttothenumberofinterruptsneeded.

7. Enterthevaluesofthelogicalinterrupts.8. WirethearrayconstanttotheIRQNumber(s)input.9. WiretheTimeoutinputifyouwanttospecifythemaximumtime

thehostVIwaitsfortheinterruptbeforecontinuingthedataflow.Bydefault,thehostVIdoesnotwaitforaninterrupttooccurandreturnsonlyinterruptsalreadysetbytheFPGAVI.Youalsocanwireaconstantwithavalueof–1towaitindefinitelyforaninterrupt.IfyouusetheTimeoutinput,youcanusetheTimedOutoutputtodeterminewhetherthehostVIcontinueddataflowduetothetimeoutoccurringortothereceiptofaninterrupt.Ifatimeoutoccurs,theTimedOutoutputreturnsTRUE.

10. Right-clicktheIRQ(s)AssertedoutputontheInvokeMethod

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functionandselectCreate»Indicatorfromtheshortcutmenu.LabVIEWcreatesanarrayindicator.TheIRQ(s)Assertedfrontpanelindicatordisplaysthenumber(s)oftheinterruptstheFPGAtargetasserts.Anemptyarrayindicatesthatnointerruptswerereceived.

11. PlacetheInvokeMethodfunctionontheblockdiagramofthehostVIinthedataflowwhereyouwantthehostVItoacknowledgetheinterruptsfromtheFPGAVI.PlacetheInvokeMethodfunctioninaCaseStructureifyouwantthefunctiontoexecuteonlywhenthehostVIreceivesaninterrupt.IfyouwireaBooleanconstantofTRUEtotheWaitUntilClearedinputoftheInterruptVI,placetheInvokeMethodfunctioninthedataflowwhereyouwanttotelltheInterruptVItostopwaiting.BesuretowiretheFPGAVIReferenceIninputoftheInvokeMethodfunction.

Place Find12. Right-clicktheInvokeMethodfunctionandselect

Method»AcknowledgeIRQfromtheshortcutmenu.UsetheAcknowledgeIRQmethodtoacknowledgethelogicalinterruptsreturnedbytheWaitonIRQmethod.

13. WiretheIRQ(s)AssertedoutputoftheWaitonIRQmethoddirectlytotheIRQNumber(s)inputoftheAcknowledgeIRQmethod.

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ForcinganFPGAVItoDownloadtoanFPGATarget(FPGAInterface)LabVIEWautomaticallydownloadsacompiledFPGAVItotheFPGAtargetwhenyouinvoketheOpenFPGAVIReferencefunction.LabVIEWalsoautomaticallycompiles,downloads,andrunsanFPGAVIontheFPGAtargetwhenyouclicktheRunbuttoninanFPGAVIiftheFPGAtargetsupportsInteractiveFrontPanelCommunication.LabVIEWdoesnotdownloadtheFPGAVIiftheVIisalreadyontheFPGAtargetoriftheFPGAisreservedforotherpurposes.Youcanforceadownloadbyright-clickingtheFPGAVIintheProjectExplorerwindowandselectingDownloadfromtheshortcutmenu.FPGAtargetfunctionalityvariesdependingonthespecifictarget.RefertothespecificFPGAtargethardwaredocumentationforinformationaboutdownloadingoptionsavailableforthetarget.YoualsocanprogrammaticallyforceLabVIEWtodownloadanFPGAVIorbitfiletoanFPGAtargetfromahostVI.CompletethefollowingstepstoprogrammaticallyforceanFPGAVIorbitfiletodownload.

1. OpenareferencetotheFPGAVIorbitfile.NoteTheFPGAtarget,FPGAVI,andhostVImustbeinthesameLabVIEWprojectifyouwanttoopenareferencetoanFPGAVI.ThehostVIdoesnotneedtobeinaprojectifyouopenareferencetoabitfile.

2. PlaceanInvokeMethodfunctionontheblockdiagram.

Place Find3. WiretheFPGAVIReferenceOutparameteroftheOpenFPGA

VIReferencefunctiontotheFPGAVIReferenceInparameteroftheInvokeMethodfunction.

4. Right-clicktheInvokeMethodfunctionandselectMethod»Downloadfromtheshortcutmenu.

IfyouprogrammaticallydownloadtheFPGAVItotheFPGAtargetwiththeInvokeMethodfunction,youalsomustprogrammaticallyruntheFPGAVIontheFPGAtargetwiththeInvokeMethodfunction.PlaceanotherInvokeMethodfunctionontheblockdiagramandselect

lvfpgahost.chm::/Open_FPGA_VI_Reference.html
lvfpgaconcepts.chm::/FPGAAppDev.html
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Method»RunfromtheshortcutmenuoftheInvokeMethodfunctiontoprogrammaticallyrunanFPGAVIorbitfile.

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Stopping,Aborting,andResettingFPGAVIs(FPGAInterface)IfyoucreateanFPGAVIthatyouwanttostopandrunagainfromahostVI,NationalInstrumentsrecommendsthatyoudesigntheFPGAVIsothatyoucanstopitsexecutionbysettingacontrolontheFPGAVItoacertainvalue.ThisdesignpracticeallowsyoutocontrolhowtheFPGAVIisstoppedandthevaluesontheoutputsontheFPGAtargetwhentheFPGAVIstops.YoucanstoptheFPGAVIfromthehostVIbywritingtherelevantFPGAVIcontrol.YouthencanruntheFPGAVIbyusingtheInvokeMethodfunctionwiththeRunmethod.IfyoudonotneedcontroloftheFPGAtargetoutputs,youcanusetheInvokeMethodfunctionwiththeResetmethodtoabortandrestoretheFPGAVItothedefaultstate.IfstoppingisnotdesignedaspartoftheFPGAVI,youcanresetand/oraborttheFPGAVIfromthehostVIusingtheResetmethodorAbortmethod.TheAbortmethoddoesnotresettheFPGAVItothedefaultstatewhichmightaffecthowtheFPGAVIreactstofutureexecutionsoftheRunmethodfromthehostVI.

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