LabVIEW FPGA Idea Exchange

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Xilinx log window should use a fixed-width font.

 

Which of these two string indicators with identical content is easier to read?

 

FPGA Xilinx Log font.png

 

Spoiler
The one on the left is Courier, the one on the right is the default Application font

 

How amazing yould it be to have the ability to visualise resource usage on a FPGA target using a similar view to that shown above (courtesy of Windirstat)

 

I only recently shaved a significant portion off my FPGA usage by finding out that I had a massively oversized FIFO in my code for almost a year without noticing.  I feel that this kind of visualisation (with mouse over showing what is actually occupying the space) with differentiation between Registers, LUTs, BRAM, DSPs and so on would greatly aid those of us trying to squeeze as much as possible out of our FPGA designs.

 

I think providing this information based on the "estimated resource utilisation" i.e. before Xilinx optimises stuff away would be OK.  I'm not sure if the final resource utilisation can be mapped as accurately in this way.

 

It would also be nice to see CLIP utilisation and NI-internal utilisation at a glance as this is apparently hugely different between targets.

 

Shane.

We need a way to simply reinterpret the bits in our FPGAs.  I currently have a situation where I need to change my SGL values into U32 for the sake of sending data up to the host.  Currently, the only way is to make an IP node.  That is just silly.  We should be able to use the Type Cast simply for the purpose of reinterpreting the bits.

Why the "Stacked Sequence Structure" is still present in the FPGA palette? It has been removed from other targets palettes. I think it's better not be in the FPGA palette also.

  • UI & Usability

Hi How about facility of import and export of I/O Label in FPGA-Real time project as shown image instead of manually renaming each I/O

 

IO Label.jpg

  • UI & Usability

FPGA registers would be more user friendly, if they could be quick dropped and also searchable (find caller as has been suggested before). This would be also great for handshakes.

  • UI & Usability

Hello all.

 

It is time-consuming that we have to compile all LabVIEW FPGA code even if there is tiny little change on FPGA code.

I understand there is sampling probe, Desktop execution node and simulation tools to reduce such time.

 

Our customer in Japan, would like to use incremental compile function also on LabVIEW.(Please see below)

I agree his opinion.

 

http://www.youtube.com/watch?v=9v50uCVdW3o

 

What do you think?

 

Eisuke Ono

Application Engineer at National Instruments Japan.

 

 

  • UI & Usability

I just manually transferred a fairly large LabVIEW FPGA project from one target to another (7965R to 7966R).  It would be nice to be able to click on the RIO target in the project and have an option to "Migrate to New FPGA Target" in the context menu.  The menu would open a new dialog where you could select the new RIO target and then it is automatically added to the project and populated the VIs, FIFOs, derived clocks, memory blocks, etc. from the original target.  The user can choose whether or not to delete the original RIO target.

 

This would also make it very easy for users to transfer sample code from the LabVIEW Example Finder to the correct FPGA target (insead of having the folder labeled "Move These Files").

  • UI & Usability

I don't like static resource definitions FIFOs, Block RAMs or DMAs in my projects.  I prefer to have the code declare such entities as they are required because this makes scalability much easier to achieve.

For FIFOs, BlockRAM and so this is no problem, but there are two things we currently cannot instantiate in code:

DMA Channels

Derived clocks

 

To deal with the seond option: Why is it currently not possible to create a derived clock in code.  The ability to automatically have one piece of code accept a single clock reference and let one loop run at a multiple of the speed is something I've wanted to be able to do in the past but it is currently impossible in LabVIEW.

 

Please let us configure / define derived clocks in LV code.

It would be nice to be able to use logic operators on arrays in Single Cycle Timed Loops.

  17863i0D7A4F514670B8AB

When there are many controls on the front panel of the FPGA, selecting the control from a Read/Write Control node in the host can become a pain.  It is one very large list of controls on the front panel of the FPGA.  This list has no scrollbar, no browse, or search feature, and no obvious way of grouping controls.

 

Here is one example of a front panel, and a video showing how long it takes to scroll through the list of contorls.

 

FPGA Front Panel.png

 

And here is the video of me scrolling through the controls:  http://screencast.com/t/PLzptTwq58aw

 

There is plenty of room for improvement.  Here are just a few ways I think NI could make this better.

 

Browse and Search

 

When using a Property Node, or Invoke Node, the very top option is to "Browse..."  From here a list of all properties, or methods can be seen in a resizeable window.  Here you can also search, and sort alphabetically.  The Read/Write Control node could have similar functionality making selection of controls easier.

 

Front Panel Selection From FPGA

 

There could be an option for creating a node by selecting the controls on the front panel of the FPGA.  A solution that may work today, is to select the controls, then invoke a custom QuickDrop command that creates the node and puts it in the clipboard so it can be pasted in the host VI.  If this were to become an option, I'd hope there is a way to combine two nodes into one, by concatenating the controls of one onto the other. 

 

Front Panel Selection From Host

 

Lets say you already have the Read/Write Control node on the host.  There could be an option by right clicking that would open a new window, showing a static image of the front panel of the FPGA, which the user could then click on.  This would be great because the developer probably already knows the control they want based on the front panel location.  I don't know how possible this is because you could load a bit file which won't have any front panel information. 

 

Easier Grouping of Controls

 

Right now there is a way to group controls of an FPGA.  This feature is never talked about, and doesn't work on dynamic bit files.  Here is a discussion where I describe the steps to make controls grouped on the host.  Still this isn't supported on all FPGA setups, and you have to conform to a specific naming convention.  Why can't controls that are grouped on the front panel, just be grouped in the host?

 

 

This idea exchange is really for any kind of improvement to the FPGA control selection.

  • UI & Usability

Single cycle timed loops are a huge performance enhancer in LV FPGA. We learn to use these very prolifically in and around our code to save precious FPGA space, yet the BD representation of the SCTL is the standard Timed Loop structure, with both the Left and Right "ears" visible as well as the conditional terminal.

I propose that the SCTL be given it's own representation on the block diagram, one without the "ears" and without the conditional terminal (by definition it only runs once). This will promote much cleaner looking FPGA code and more readable diagrams.

 

SCTL.PNG

  • UI & Usability

Many data streams contain information for multiple channels or multiple samples. Today one must pack this data into larger integer types or interleave the data manually into multiple writes to the DMA FIFO API. It would be much simpler if the DMA natively support cluster and array data types. The local FIFO, Memory, and Register APIs already support this; extend it to DMA.

The FPGA compilation results should be copied to a file in the folder with the bitfile.  This is needed to track the history of compilation results, especially useful when using source code control.  Right now they get overwritten with each recompile.

 

Adding a Post-build action VI to the FPGA build spec, would also enable something like this.

  • UI & Usability

This might have already been asked, but I couldn't find any posts.

 

X-Nodes are huge in comparison to the size of a subvi or most anything else on the block diagram of code, so lets shrink them down.

 

Can we remove the Read/Write box?  We already have the little triangle to tell us the function/direction.

Can we use the node name instead of the generic term Data/Element?  It's already there.

 

From there we can model it after a property node using references instead of error lines or we can model it after the IO node which is a little cramped but gets the job done.  Both options retain a purple/pink bar to help identify it's X-node-iness.

 

X-nodeShrink.png

  • UI & Usability

If I am choosing to offload multiple FPGA compilations to either a local or cloud compile farm, can we not at least do the itnermediate file generation in parallel?  Our current design takes approximately 10-15 minutes to generate intermediate files.  For 5 Cloud compiles, this blocks my IDE for around an hour.

 

Since the file creation processes are independent of each other, why can't we do them in parallel?

When accessing a FPGA control / indicator from the HOST, a ~property node is used, and the developer has to pick the right control / indicator from a list

 

When there's lots of items on the list, it can be a pain to scan the list for the right one.

 

At the moment they are listed in order they were created on the FPGA.

 

Could they instead be listed in alphabetical order? Or give the developer the choice?

 

 

  • UI & Usability

This is the current situation when dealing with register creation on FPGA targets:

 

Regsiter Create.png

 

This is what I would like:

 

Regsiter Create wishful thinking.png

 

I am currently creating a group of classes to abstract out inter-loop communication and the ONLY thing changing between classes (aside from variations between Ragister vs FIFO vs Global and so on) is the datatype.  Being able to link the Register creation to a data input (the data value of the class itself for example) would save a lot of work in such operations.  If it were also possible to do the same for the Register stored within the class private data then implementing different classes int his way would be really easy.

 

Even without classes, the ability to autoadapt the type of registers / FIFOs in this way would be a real step towards re-usable code on FPGA.

 

 

I have several FPGA projects that require significant compile time (up to 1.5 hours), and for that I am thankful to have my compile server running on a separate computer.

 

The issue comes with the seven Pre-Compile steps that occurs before LabVIEW sends to the code to the compiler. On one particular project this action alone can take up to 35 minutes during which time I can do nothing on that machine.

 

I would like to see much of this precompile time moved from the development environment to the compile server. There already exists a mechanism for updating the user with the compile status so those precompile errors could be annunciated in a similar fashion.

 

Get the development system back online as quickly as possible.

Proper unit testing is a key component of large LVFPGA project success.  As the number of modules grows, so does the number of units tests increase.  We are working on automatic continuous integration methods that will continue to monitor the accuracy of all modules and assemblies throughout the project life cycle.  IP Integration node and NI's wrapper around Xilinx IP makes this task more difficult.  When our continuous integration machine refreshes the source code from the repository it has to regenerate these nodes in order to compile.  The "Regenerate IP Integration Node Support Files..." tool does not always properly update all IP.  It seems like the NI wrappers around Xilinx IP are most problematic.  The only way a computer can properly update its version of the node is to open the VI and click through the Xilinx IP generation pages to get it to update.

 

As a rule we do not commit build products into our source code repository.  One option would be to submit all the support files generated when first creating the IP integration node so that others users might not have to update.  This can become messy and quickly unwielding.  The problem arrises when changes to the IP integration node cause more or fewer support files to be generated.  This then requires deleting some files from the repository and adding others which is tedious and leads to errors.  One compromise would be if the IP integration created one single compact file that contains all the information needed (expect the input vhd, etc. files) that could be committed to the repository.  Even better would be to roll this information into the VI itself.  Neither of these might be ideal if the support file contents take up a lot of disk space.

 

Regardless there needs to be a better solution to allow for automated continuous integration testing.

  • UI & Usability