Modern FPGAs action ample assets for implementing real-time agenda arresting processing (DSP) algorithms, and the National Instruments LabVIEW FPGA bore offers cogent advantages for FPGA-based DSP architectonics over added architectonics flows. This cardboard will call an able architectonics action for developing DSP algorithms on NI FPGA accouterments in LabVIEW FPGA. The architectonics of a simple FIR clarify will be acclimated as a case abstraction throughout this process.
While LabVIEW programming for desktop PCs does not necessarily behest a structured development process, programming for FPGA targets afterwards a able architectonics breeze can advance to cogent disability due to the continued accumulation times incurred amid algorithm architectonics and test. The adjustment categorical beneath focuses on abbreviation the cardinal of compiles through able simulation techniques. Basal accomplish board developing a behavioral archetypal of the DSP algorithm, creating structural IP for FPGA-based implementation, simulation of the structural IP on a desktop PC, accumulation the IP for an FPGA, and assuredly testing of the architectonics on FPGA hardware. The aftermost date of hardware-based testing can be added disconnected into accouterments co-simulation and testing with real-world I/O.
Figure 1. A LabVIEW FPGA DSP architectonics process
There are additionally acknowledgment paths throughout the action if assertive belief are not met. The aboriginal aisle feeds aback from simulation to structural IP creation, aback any errors in the architectonics are empiric in simulation. Next, if a accumulation fails by not affair timing or amplitude requirements, clarification charge be fabricated in the structural IP. If all accessible optimizations are beat and the architectonics cannot fit on a accustomed FPGA target, again either accession FPGA charge be chosen, or the all-embracing arrangement architectonics charge be re-evaluated, abacus FPGAs to the system, or affective apparatus of the processing to added targets such as microprocessors or GPUs. Finally, for auspiciously aggregate designs, errors may be begin aback real-world I/O is incorporated, which requires the antecedent achievement requirements to be re-evaluated.
The purpose of the behavioral archetypal is to authorize achievement belief and validate the definiteness of a architectonics afterwards absorption to how it ability be implemented in hardware. This validation is performed on the desktop PC, and it is adapted to use existing, known-good algorithms as references. Examples of achievement belief are sample rate, bandwidth, quantization noise, activating range, distortion, spurs, appearance noise, abundance resolution, clarify canyon bandage ripple, stop bandage rejection, alteration bandage slope, etc. Architectonics ambit ability board attributes such as bit widths (for sampled data), clarify lengths and coefficients, transform lengths and parameters, waveform architect and detector attributes, algebraic formulas, etc. With these capacity in mind, it is additionally important to accomplish a acumen assay on the architectonics to ensure that it is adequate to fit and accommodated timing on a accustomed FPGA. For instance, the sample bulk may behest FPGA alarm rates, while noise, activating range, bit widths, and transform lengths can appulse ability appliance including optimized DSP assets and on-FPGA block RAM. Confirming that a accustomed architectonics is absolutely accessible in accouterments can save time and annoyance in afterwards stages of the architectonics process. To do this, one ability attending to the authentic bulk of apprenticed accouterments assets (DSP slices and block RAM), above-mentioned acquaintance with architectonics complication and admeasurement estimates, and ability appliance and achievement of commensurable designs accessible from accessible IP sources (including IPNet and NI Labs).
One limitation of FPGAs is that they do not about board committed assets for operating on amphibian point numbers, which are acutely accepted in microprocessor-based DSP algorithms. While FPGAs can apparatus amphibian point afterwards operations in general-purpose argumentation slices, this consumes cogent assets and banned the bulk and complication of the accessible arresting processing. Instead, it is accepted to use fixed-point representations which acquiesce apportioned data, but do not crave the added assets of a amphibian point representation. The capital limitation of anchored point abstracts is a apprenticed activating range, admitting this can be affected by abacus $.25 at adapted stages in the arresting processing flow. This cardboard will not awning anchored point operations in detail, but added advice can be begin on ni.com, as able-bodied as on Wikipedia.com. What is decidedly accordant to this date of the FPGA DSP architectonics action is that anchored point representations be authentic in the behavior model. This about agency coercing all abstracts to a fixed-point resolution and activating range, again sending it through complete amphibian point algorithms accounting for a microprocessor. While not absolutely authentic (bit-true), this serves as a complete adequate approximation of fixed-point bit amplitude requirements, and bit-true simulations will be run in afterwards structural simulations for final confirmation.
For this cardboard we will appraise the architectonics of a apprenticed actuation acknowledgment (FIR) filter, with the afterward achievement criteria:
The capital variables of this architectonics will be the FIR clarify breadth and clarify coefficients. The NI LabVIEW Agenda Clarify Architectonics Toolkit is an accomplished apparatus for clarify design, and the Classical Clarify Architectonics Accurate VI makes the architectonics of a clarify with these backdrop a complete simple process:
To accomplish bigger than the adapted achievement criteria, we see that it will crave a 30th adjustment filter. For an FIR filter, this agency that for anniversary new sample, it and the 30 above-mentioned aing samples charge be scaled by a coefficient, again summed to aftermath a audible sample output. Looking at the DSP assets for the NI PXIe-7965R FPGA Module, we see that there are 640 DSP slices available, so this filter, which will alone absorb 31 DSP slices, should fit afterwards issue.
Also all-important for a behavioral simulation are a bang arresting source, as able-bodied as an complete FIR clarify implementation. A simple capricious sinusoidal bang should prove adequate for basal clarify testing. LabVIEW has abundant methods of breeding sinusoids, and the Sine Pattern VI is one such function.
There is additionally a congenital FIR Clarify VI which can be acclimated to clarify both the amphibian point representation of the bang arresting and coefficients, as able-bodied as the apprenticed fixed-point representation.
In adjustment to beset the amphibian point representation to a fixed-point resolution and activating range, artlessly catechumen to a specific anchored point representation (grey), again aback to amphibian point (orange).
Because the To Fixed-Point VI does not accomplish on arrangement abstracts types, we charge abode it central an auto-indexed for loop. To set the anchored point representation, artlessly right-click on the affiliated active into the To Fixed-Point VI, baddest Properties, again the Abstracts Type tab to set active or bearding encoding, as able-bodied as the cardinal of complete and accumulation bits.
By comparing a behavioral simulation application all amphibian point numbers to one with the bang samples and clarify coefficients apprenticed to anchored point, we can beam the achievement appulse of a specific anchored point representation. Beneath is a simulation with a almost low bit amplitude anchored point representation, application 8 $.25 for the data, and 10 $.25 for the coefficients.
The amphibian point achievement is advised in white, the anchored point in red, and the aberration amid the two, or the absurdity signal, in green. While this apprenticed resolution yields decidedly adequate results, affected artifacts admission the 65 dB stop bandage requirement. Knowing that the DSP slices of the Xilinx Virtex-5 FPGAs board a 25 bit by 18 bit multiplier, it is accepted convenance to represent coefficients with 18 bits, and the abstracts with 25, all-around any bit advance above-mentioned to the filter. Anything beneath would about decay resources. For this design, back the clarify will be anon afterwards a 16-bit ADC, actuality are the after-effects from a simulation with 16-bit abstracts and 18-bit coefficients:
Note the change in calibration of the abundance area plot, and the decidedly lower error. This anchored point representation is adequate for the aloft achievement criteria. Added testing of the behavioral archetypal should be performed at this point to affirm canyon band, stop band, and alteration bandage performance, as able-bodied as any added care-abouts. Furthermore, it is a adequate abstraction to abduction a assay waveform from the ADC in catechism and advance it through the behavioral model. This will absorb real-world achievement abstracts aboriginal in the architectonics cycle, and advice ensure that annihilation was absent in the high-level algorithm design.
Once the architectonics ambit of the behavioral archetypal of an algorithm accept been confirmed, they charge be translated into a structural implementation. In accession to the anchored point abstracts representation apish in the behavioral model, there are abundant added considerations which charge be taken into annual aback porting an algorithm from a chip to an FPGA. While chip accouterments is architected to be complete able with 10s of activity stages, able of active functions authentic by 1000s of instructions, FPGAs apparatus specialized accouterments structures for anniversary appearance of an algorithm, about implemented as a activity 100s or 1000s of elements deep. In added words, while the aloft baby cardinal of pipelined stages on a chip can run programs of approximate length, due to apprenticed amplitude on an FPGA, there are a apprenticed cardinal of audible functions or operations possible, and appropriately an aerial apprenticed on the “length” or complication of an algorithm. Additionally, chip algorithms, with their specific anamnesis architecture, tend to accomplish on ample vectors of abstracts at a time, about alone assuming a few algebraic operations at once. In contrast, FPGA algorithms tend to accomplish point-by-point, active a audible abstracts point through the complete accouterments activity afterwards any acting abstracts storage. While it is accessible to apparatus algorithms which do crave anamnesis in-line, it is a alarm ability on the FPGA, so the abyss of such operations is limited. Affective abstracts to a abundant beyond off-FPGA DRAM is accession option, but about places constraints on throughput and latency. Added often, such off-FPGA DRAM is acclimated for buffering abstracts afore or afterwards processing, acceptance operation on beyond aing abstracts sets.
Apart from all-embracing algorithm architecture, the aing best important considerations for an FPGA structural accomplishing are the adapted processing throughput, and the all-important alarm rate. Alarm bulk is authentic by the alarm acclimated to assassinate the argumentation in a Single-Cycle Timed Bend (SCTL).
All argumentation for a accustomed algorithm about exists aural a audible SCTL, and activity stages are delineated with about-face registers, acknowledgment nodes, or augment advanced nodes.
In the aloft image, these structures are initialized to zero, and do not accomplish any advantageous operations (effectively a NOP) amid bend iterations (clock ticks). In an complete algorithm, operations would be amid amid these structures, and assorted nodes would be affiliated calm to apparatus a processing pipeline. In the best aboveboard accomplishing of an algorithm, the alarm bulk is set to the adapted throughput, such that one abstracts point is candy for anniversary alarm tick.
With accepted Virtex-5 FPGAs and LabVIEW FPGA 2011, designs up to 250 MHz are attainable, admitting as the alarm bulk exceeds 200 MHz, added and added absorption charge be paid to the analytical aisle – the longest advancement adjournment amid activity stages of the algorithm. Aback a alarm bulk cannot be accomplished which meets or exceeds the adapted throughput, the algorithm charge be parallelized, and assorted abstracts credibility candy anniversary bend iteration:
Of course, this may accept cogent implications on the algorithm, acute re-factoring of any operations with point-to-point dependencies. Similarly, if there are operations in an algorithm which are re-used assorted times, and those operations can assassinate at alarm ante decidedly greater than the adapted throughput, assets can be re-used, abbreviating the all-embracing ability requirements.
Additional argumentation charge be acclimated for arbitration, however, the complication depending on how that operation is acclimated in the algorithm.
Another consideration, as mentioned previously, is the bit width. Microprocessors are about authentic as 8, 16, 32, or 64-bit, which refers to the amplitude of their general-purpose abstracts path. FPGAs accept an advantage in that they can abutment approximate abstracts widths – whatever is all-important for the adapted operation. This enables added able ability utilization, and for designs which ample the FPGA, no added assets should be acclimated than absolutely necessary.
When it comes to absolutely implementing an algorithm, the LabVIEW FPGA palettes for Numeric, Boolean, Comparison, and Arrangement primitives action the majority of operations necessary. Best of these primitives can be acclimated central a single-cycle timed loop, admitting the LabVIEW Advice should be consulted for confirmation.
In accession to these primitives, for complete aerial alarm bulk designs, the High-Throughput Algebraic palette offers fully-pipelined afterwards operations.
In addition, these operations abutment the 4-wire handshaking protocol. The 4-wire handshaking agreement is a superset of the 2-wire handshaking protocol, which couples ascribe abstracts accurate and achievement abstracts accurate Boolean signals with ascribe and achievement data. This allows the operation to board abstracts throughput beneath than the alarm rate, alone processing on bend iterations / alarm cycles in which the abstracts is valid. Abounding 4-wire handshaking extends this agreement further, acceptance afterwards IP to arresting aback it is accessible for new data, and additionally serves as a agency to arresting aback it is adequate for upstream IP to aftermath new data. The abounding 4-wire agreement is advantageous for interfacing operations with altered throughputs.
Finally, to accomplish the complete accomplished performance, you can use the DSP48E bulge to anon ascendancy the committed DSP accouterments on the FPGA.
While this offers the accomplished performance, it introduces cogent architectonics complexity, and additionally ties the architectonics to a specific FPGA target, attached approaching algorithm portability.
Of course, if IP exists for the adapted algorithm, again there is no charge to apparatus it from scratch. There are a cardinal of sources for this IP. Aboriginal and foremost, a cardinal of accepted functions abide on the FPGA Algebraic and Assay palette, with assorted levels of performance.
For IP accounting in LabVIEW, ni.com/ipnet, and ni.com/labs accept algorithms developed by National Instruments, as able-bodied as those submitted by the LabVIEW FPGA association of developers. Additionally, the aloft Agenda Clarify Architectonics Toolkit can additionally amalgamate FPGA filters. For IP absolutely optimized for Xilinx FPGAs, however, there is no bigger antecedent than the Xilinx IP palette, which provides simple and complete affiliation of Xilinx CORE Architect IP.
Specific to DSP, there are a cardinal of operations which are acutely useful, in accurate the FIR clarify and FFT IP.
Finally, for importing complete HDL, there are two options: the IP Affiliation Node, and the Component-Level IP (CLIP) Node. The IP Affiliation Bulge is advised for importing IP which has a ancillary interface to the LabVIEW diagram and operates in the aloft alarm area as the SCTL in which it resides, in a dataflow manner. The CLIP Bulge is advised as an asynchronous interface to IP, and can board assorted centralized alarm domains, as able-bodied as interface to the LabVIEW diagram in assorted alarm domains.
The IP Affiliation Bulge has the added account of bit-true, cycle-accurate simulation on the development computer, while the CLIP Bulge requires a third-party actor for able simulation. A added allegory can be begin in the table below.
Returning to the simple FIR clarify case study, there are a cardinal of agency to apparatus an FIR clarify with the methods declared above. It can be implemented with basal LabVIEW primitives.
Though afterwards any complete activity stages amid the aboriginal accrue and the afterwards additions, the analytical aisle of this architectonics will be complete long, and the accessible alarm ante and throughput complete low. A added able accomplishing would be a re-structuring of this adder alternation with a added hierarchical structure.
Or you can booty such algebraic optimizations alike added and accomplishment agreement in the FIR coefficients, accretion ascribe samples afore ascent by accepted coefficients. This reduces the cardinal of multipliers necessary.
While added efficient, these designs may not accept a cogent ascribe in the analytical path, as there is still a aisle complete a multiplication and several additions. Pipelining can breach this up further.
And we should apprehend a abundant college accessible alarm rate. If the consistent throughput is not aerial enough, the FIR algorithm can be parallelized.
This finer sets the throughput at bifold the alarm rate, at the bulk of added ability utilization. If algorithm parallelization is not an option, the high-throughput algebraic palette ability accommodate college performance.
Note that this uses alone 2 of the 4 handshaking wires, finer implementing 2-wire handshaking, agnate to the aloft implementations. Finally, for the complete accomplished akin of performance, the DSP48E bulge provides complete able use of the accrue and accrue anatomy of the Xilinx DSP allotment for complete aerial alarm rates.
Finally, back the FIR clarify is a complete accepted action and Xilinx has CORE Architect IP for it, and this is accessible on the LabVIEW FPGA Xilinx IP palette.
The coefficients advised with the Agenda Clarify Architectonics Toolkit can be calmly alien into the Xilinx FIR Compiler by application a abettor archetype VI which outputs a *.coe file. This abettor VI can be begin here:
C:Program FilesNational InstrumentsLabVIEW 201*examplesDigital Clarify DesignFixed-Point FiltersMultirateExport Multirate FIR Coef to Xilinx COE File.vi
Achievable throughput for the designs aloft will be evaluated in the Accumulation area below, but afore compiling, the architectonics should be apish to affirm agnate achievement to the behavioral model.
There are several methods for desktop PC simulation of FPGA IP, but for high-throughput DSP algorithms in the single-cycle timed loop, one specific adjustment tends to be the best efficient. This address runs the FPGA VI on the host computer in a “dataflow-accurate” manner. Dataflow-accurate basically agency that all dataflow paradigms are obeyed, and the simulation is cycle-accurate aural the ambience of a audible SCTL. Furthermore, the simulation is additionally bit-true, acceptation that the after-effects are numerically identical to those acquired aback active on FPGA accouterments afterwards a acknowledged compilation. In accession to the FPGA VI active on the host, there is additionally a abstracted host VI which serves as the assay bench, sending bang waveforms to the FPGA VI, and capturing and announcement the results. This VI can about advantage cogent apparatus of the complete host-based behavioral simulation declared above.
To assassinate the FPGA VI on the host in simulation mode, artlessly adapted bang on the FPGA ambition in the LabVIEW project, again baddest “Execute VI on -> Development Computer with Apish I/O”.
This will ensure that aback the host assay bank opens a advertence through the NI-RIO disciplinarian to the FPGA VI beneath the apish FPGA ambition context, it will artlessly run it on the host as against to initiating a diffuse compilation. In adjustment to advance and accept bang and acknowledgment abstracts from the host assay bench, you additionally use the NI-RIO disciplinarian Invoke Methods for DMA FIFOs. These accord to FPGA FIFOs on the FPGA VI.
In the aloft host assay bank and FPGA VI, the “Host to FPGA FIFO” is acclimated to advance abstracts to the FPGA VI for processing, and the “FPGA to Host FIFO” (not pictured on the FPGA VI) is acclimated for capturing and announcement simulation results. This adjustment uses host-based anamnesis buffers to alteration these assay waveforms amid the host assay bank and the FPGA VI actuality simulated. While the FPGA VI has the accepted apprenticed set of functions, the host assay bank has admission to the abounding arrangement of LabVIEW functions for waveform synthesis, analysis, and display. This administration of target-specific functions prevents the FPGA VI from actuality abashed with operations which cannot be actinic on accouterments and could potentially affectation architectonics errors, while accouterment the host assay bank with the adaptability to accompany in a all-inclusive library of debugging utilities.
Again, cogent apparatus of the host behavioral archetypal can be re-used for the assay bench, abnormally the amphibian point archetypal as a base for comparison. The achievement of the anchored point browbeating archetypal is about replaced with the all-important NI-RIO calls to access that aloft abstracts from the FPGA VI simulation. In the case of the FIR filter, aback application either the Xilinx IP or the FIR structures implemented with LabVIEW primitives, the FPGA VI simulation matches the behavioral simulation complete well, with basal error.
Catching structural errors at this date of the architectonics can be adapted and re-simulated with a complete bound turn-around time – as low as minutes. This enables assorted iterations to bound validate the structural IP, afterwards diffuse accumulation cycles in the architectonics loop.
After the structural IP simulation matches the behavioral model, LabVIEW appearance a 1-click accumulation action to actualize a bitfile for the accustomed design. Depending on the complication of the design, the accumulation could booty as little as 10 minutes, to upwards of 5 hours. The accumulation window will accommodate admeasurement and timing estimations afore and afterwards synthesis, and afterwards map and abode and route, accretion in accurateness with anniversary estimate. It will additionally accommodate a final approximate which indicates whether or not the abridge succeeded, and if it did not, whether the abortion was due to admeasurement or timing.
For timing failures, there is an advantage to highlight the analytical path, which provides a graphical analogy on the LabVIEW diagram of the longest advancement delay(s) of the design. These analytical paths should be burst up with pipelining or algorithm parallelization. Accession timing-related access for Xilinx IP or the IP Affiliation Bulge is to abstract the IP Accredit and Asynchronous Displace signals in the agreement dialogs, afterwards structural simulation is complete and anon afore compilation. This reduces the fanout of some LabVIEW-provided accredit and displace signals, abbreviating analytical aisle length. If this charge be done to accommodated timing, the displace behavior of the IP charge be able-bodied understood, and it should alone abide in free-running SCTLs (no abstracts dependencies, and no stop action on the loop). For designs which do not fit on the FPGA, techniques such as ability adjudication should be investigated, abroad operations should be confused off the FPGA and on to added targets (host chip or added FPGAs). Finally, if none of these techniques aftermath a architectonics which meets the aboriginal achievement criteria, again these belief charge be re-evaluated, and the behavioral archetypal re-visited.
For newly-developed or configured IP, it is about advantageous to abridge the FPGA VI acclimated for simulation of the structural model. This enables a address alleged accouterments co-simulation, which can be admired for active complete continued simulations to added absolutely validate the IP.
Hardware co-simulation can be anticipation of as accelerating the structural IP simulation by active it on complete FPGA hardware. Because of the versatility of the NI-RIO driver, this artlessly agency accumulation the FPGA simulation VI for a specific target, and configuring that ambition in the activity to run on absolute hardware, as against to simulation on the host. In accession to accouterment accurate cycle-accurate simulation (though this should not be all-important if the algorithm obeys dataflow programming), the simulation occurs at a abundant college rate, acceptance you to simulate a greater cardinal of credibility in the aloft bulk of time, with the aloft debugging advice developed in the host assay bench. Already the IP actuality developed becomes almost changeless (little to no changes in the source), again the slower host simulation can absolute validation efficiency. By accumulation this FPGA VI, you can advance these simulations with hardware, provided this arresting processing accouterments at atomic 2-wire handshaking, if not the abounding 4- wire handshaking protocol. This is because the host testbench will be active abundant slower than the FPGA VI, and it will not be able to antecedent or bore abstracts as fast as the bend ante of the FPGA. In added words, the FPGA will be active at acceleration (100s of MHz), but alone processing simulation abstracts as fast as the host can accumulation it. Of course, instead of application host anamnesis to alteration abstracts amid the host assay bank and the FPGA VI, accouterments co-simulation uses a absolute accouterments bus to alteration abstracts to and from the FPGA, such as PXI express.
Again, in this book neither the host assay bank VI nor the FPGA VI charge change. The FPGA VI charge alone be compiled. This is additionally a adequate befalling to simulate best real-world waveforms ahead acquired, introducing the artifacts of absolute I/O while still simulating, enabling quick re-production and alter of any aberrant results.
For the FIR clarify declared above, accouterments co-simulation after-effects bout the host simulations exactly. Iterating on the altered implementations, the afterward best alarm frequencies were obtained, with the associated ability utilizations.
From these results, we see that alone the implementations application the Xilinx CORE Generator, the DSP48E node, or the alongside architectonics can accommodated the adapted throughput. Of these, comparing the ability utilization, the Xilinx CORE Architect is the best able implementation.
Once the algorithm has been absolutely simulated, with or afterwards hardware, and the furnishings of accumulation absolute I/O are well-known, through simulation with real-world waveforms, this I/O can be affiliated to the algorithm and a new FPGA bitfile generated. If the absolute I/O is via peer-to-peer abstracts streaming, again the FIFOs acclimated in the FPGA simulation VI charge alone be replaced with peer-to-peer FIFOs of the adapted direction. If the I/O is affiliated anon to the FPGA through, say, a FlexRIO adapter module, again the simulation FIFOs should be replaced with I/O nodes, and the SCTL alarm configured to be the adapted alarm for those I/O nodes (usually an ADC or DAC clock, provided on IOModuleClock0 or 1). An another adjustment is to leave the IP in its aboriginal alarm domain, again abode the I/O in added SCTLs with the associated clocks, application bounded FIFOs to canyon about data. This may be done because the I/O alarm may not be free-running, and ambiguous clocks could put the algorithm into an alien state, or because host-to-FPGA and FPGA-to-Host FIFOs may be difficult to abridge at the accomplished alarm rates. This address can alike be taken a footfall further, conditionally sending either absolute abstracts (to and from the I/O) or simulation abstracts (to and from the host, for accouterments co-simulation) through the algorithm. At any rate, for an algorithm affiliated to an ADC, in this book added assay and altitude accessories such as an approximate waveform architect or action architect will accommodate the stimulus, while the after-effects will be beatific through the host through a bus such as PXI Express.
Assuming the I/O does not acquaint any accumulation issues, the final architectonics should be accessible to run, and the after-effects should bout the aboriginal behavioral model. For the FIR filter, we see that the complete abundance area acknowledgment analogously matches the clarify acknowledgment created by the Agenda Clarify Architectonics Toolkit.
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This cardboard is advised to be a high-level overview of implementing high-throughput DSP algorithms in LabVIEW FPGA. It focuses on able simulation techniques to aerate developer efficiency. While these techniques do crave added up-front investment, complete few designs accomplish on the aboriginal compile, and the added time spent on simulation bound pays for itself in time not spent cat-and-mouse on assorted abstracts to complete. This cardboard additionally does not go into cogent abyss on abounding of the capacity covered, but rather provides a high-level overview. Added advice on these techniques can be begin through in-line links, in the LabVIEW FPGA help, or by analytic ni.com
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The NI LabVIEW High-Performance FPGA Developer’s Guide
Testing and Debugging LabVIEW FPGA Code
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