Circular Buffer implementation for LabVIEW 8.5

Greetings,
Several weeks ago I downloaded the implementation of a circular buffer for LabVIEW 8.5 from ni.com. The current webpage is:
http://zone.ni.com/devzone/cda/epd/p/id/5883
Unfortunately, this webpage has been updated since then and the available files for download (swcircularbuffer1.0.19.zip) are for LabVIEW 8.6.
So my question is: where can I find the implementation of a circular buffer for LabVIEW 8.5 ?
Thank you very much!
telmo
Solved!
Go to Solution.

Thanks Smercurio, I needed this too.
After looking at the code and seeing a note on the download page concerning a possibly more efficient method I'm wondering whether anyone has tried it yet. I'm thinking that using the in-place structure to simply overwrite a pre-defined memory space would indeed be a better implementation of a circular buffer than the somewhat kludgy bounds checking and data wrapping that the NI code provides. I plan to work on it myself of course but my boss gave me one of those "it would be great if we could have it tomorrow" talks that I'm sure most LV coders know only too well. [While the C++ guys get two weeks to write Hello Wurld. ]
Anyway, the app is quite simple: Run my USB-6251 card with a single channel as fast as possible (1.25MS/s) collecting to the circular buffer. When a trigger is pressed, store the buffer so I get a file with a few mSec of pre-trigger data.
I haven't yet tried the NI code so it may be sufficient for my needs but if anyone is working with the in-place structure and has ideas, code or suggestions I'd love to hear them.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

Similar Messages

Implementing a circular buffer - which approach works best?

I'm just implementing a circular buffer (or a circular queue, to be precise). Now I wonder which is better for wrapping around when inserting:
Using the modulo operator or using some variable to store the insertionPoint and incrementing it after each insert?
Does it make any difference in performance / readability?
Greets, Oliver

Trollhorn wrote:
Uh, that article is really nice... thanks...Is that sarcasm, or is it "prob sol"?
My suggestion would simply be: Why roll your own, when you can just use a standard implementation provided by the JDK (you do know about the java.util.Queue interface and can find standard classes which implement it, right?).
So is this just for an academic exercise, or are you one of those premature optimizer kinda guys feeling the need to eek out every last millisecond of processing and/or save every last byte of memory? And maybe you fear the reaper (garbage collector) too.
I don't see a real need for a "circular queue". Circular buffers, circular lists yes (where you iterate over it in a circular fashion), but when I think of a queue I think of FIFO pushing and popping elements, not iterating over it.

Global variables for circular buffer

Hallo!
I have another question:
I need to have a variable circular buffer size. So I would like to define the circular buffer size by a global varable.
Is that possible? I tried to use the global variable like {VAR_01} to insert in the desired field for circular buffer size, but dasylab only puts a zero in the field.
Thank you and have a nice day.
Hilby
Solved!
Go to Solution.

Unfortunately it is not possible to have a variable-sized buffer. Right-click into the corresponding textfield: the context menu does not show an entry to choose the global variable from a list.
M.Sc. Holger Wons | measX GmbH&Co. KG, Mönchengladbach, Germany | DASYLab, DIAdem, LabView --- Support, Projects, Training | Platinum National Instrument Alliance Partner | www.measx.com

How to implement multiple queues in one circular buffer?

Spoiler (Highlight to read)
Recently I have successfully shared data of 2D array among different vis in a project, using circular buffer.
However, there is only one circular buffer allowed in one project for one data type.
I want different vis, running and getting data from circular buffer in different speed, all getting data as a queue from circular buffer. Like the circular buffer's read continuous mode.
The problem is that after a vi reads in continuous mode, the read data is deleted from the circular buffer. Then other vis can not use them any more and can not keep track where they should begin to read again.
So if it is possible that there are multiple pointers or queues in circular buffer to keep track the progress of different vis, and data only update when it gets input from DAQ but not deleted when read?

LawrenceChong wrote:
Spoiler (Highlight to read)
Recently I have successfully shared data of 2D array among different vis in a project, using circular buffer.
However, there is only one circular buffer allowed in one project for one data type.
I want different vis, running and getting data from circular buffer in different speed, all getting data as a queue from circular buffer. Like the circular buffer's read continuous mode.
The problem is that after a vi reads in continuous mode, the read data is deleted from the circular buffer. Then other vis can not use them any more and can not keep track where they should begin to read again.
So if it is possible that there are multiple pointers or queues in circular buffer to keep track the progress of different vis, and data only update when it gets input from DAQ but not deleted when read?
THe last time I wrote a multi-subscriber cirular buffer was in LV 6. Since then I have found that polymorphic queues perform much better so I now use multiple queues. One queue for each subscriber of the data. The subscribers are then responsible for maintaining their own histories.
So just use multiple queues.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

A general buffer block for Labview?

Has anybody made a function which stores acquired values and returns the contents when needed. In other words I need a buffer which is as simple and fast as possible and does not waste resources.
Of course, I can make a VI which has an uninitialized shift register and call it in the loop but it is not efficient enough in some demanding situations. And also, this kind of buffer will slow down the execution of the loop because the buffer increases all the time. (Clearing the buffer is possible by writing the contents to the file but it is a little bit complicated)
In many of my applications where the acquired data is needed to be plotted I have used waveform chart which has a history for the data. I have noticed th
at history feature can be effectively used as an buffer, it does not slow the execution like shift registers and you don't need to build any buffers by yourself.
In some cases I don't need to display the data but I just want to buffer it, therefore it could be very useful to have a general buffer block in the Labview which does not have any kind of appearance in the front panel, just a node in the block diagram.(of course one way is to use the history of the waveform chart and hide the chart)
I have been programming with LV over two years daily but making of efficient buffers has always been a question to me. I have noticed that other colleagues have same kind of problems.
Maybe this kind of buffer block could be made by c-language code and called it by the LV, but calling functions from dlls take also some time overhead which can be too much.

Hi Wirer,
see attached file.
Mike
Wirer wrote:
> Has anybody made a function which stores acquired values and returns
> the contents when needed. In other words I need a buffer which is as
> simple and fast as possible and does not waste resources.
>
> Of course, I can make a VI which has an uninitialized shift register
> and call it in the loop but it is not efficient enough in some
> demanding situations. And also, this kind of buffer will slow down the
> execution of the loop because the buffer increases all the time.
> (Clearing the buffer is possible by writing the contents to the file
> but it is a little bit complicated)
>
> In many of my applications where the acquired data is needed to be
> plotted I have used waveform chart which has a history for
the data. I
> have noticed that history feature can be effectively used as an
> buffer, it does not slow the execution like shift registers and you
> don't need to build any buffers by yourself.
>
> In some cases I don't need to display the data but I just want to
> buffer it, therefore it could be very useful to have a general buffer
> block in the Labview which does not have any kind of appearance in the
> front panel, just a node in the block diagram.(of course one way is to
> use the history of the waveform chart and hide the chart)
>
> I have been programming with LV over two years daily but making of
> efficient buffers has always been a question to me. I have noticed
> that other colleagues have same kind of problems.
>
> Maybe this kind of buffer block could be made by c-language code and
> called it by the LV, but calling functions from dlls take also some
> time overhead which can be too much.
Attachments:
FIFO_WO_LocalVar2_6i.vi ‏48 KB

2d implementation of median filter for images

I want to use the LabVIEW 1d median filter function for 2d array (image) application. Vision does not have this function (or I cannot find it [using Vision 8.5]). I am assuming I can apply the 1d median filter across the rows, then transpose the array, and apply again to the rows (really the columns but now rows because of transposition). Just like for using the 1d FFT for 2d FFT. Is this strategy correct?
Thanks,
Don
Solved!
Go to Solution.

Excellent find. Further information on this fx:
"You can use this VI to apply a median filter by
selecting the correct order, (f^2-1)/2, where f is the size of
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gray-level values without significantly modifying the form of the objects or the
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So one only needs to specify the convolution kernel dimension, and can use the above equation to calculate order. It was hard for me to believe that Vision did not have this function. I now see that I should have searched the NI Vision for LabVIEW Help. This is something I almost always do in addition to searching for the actual functions from the block diagram. Had I done this, I would have found it.
Thanks again for looking.
Sincerely,
Don

ActiveX wrapper for Labview

Hello!
My name is Daniel. I'm from Argentina and I work in Tracnova S.A.
Tracnova is the Distributors of NI in Argentina.
I am having an issue with ActiveX development for wrapper an dll driver.
I have to read strain gage aquisition data from an USB device of MANTRACOURT (http://www.mantracourt.co.uk/products/wireless-telemetry).
The manufacturer provide an dll driver. It's shipped with example for VB6 that I have been testing and it works fine.
BUT I HAVE TO USE IT IN LABVIEW.
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    'we will only handle base station addresses of 1
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Daniel Lopez
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TRACNOVA SA
www.tracnova.com
Attachments:
ActiveXPropia.zip ‏459 KB

Thanks a lot nyc for your kind reply.
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National I miss to much. Nice technical support !
Please help, I need to fix this issue
Thanks a lot!
Daniel

How To create a Buffer Application Program in LabVIEW?

Dear all:
Can someone advise me on how to implement a buffer application for LabVIEW.
Basically I have 2 application programs than run continously in paralell.
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Any suggestio
n will be highly appreciated. I attach txt file with a little more description of the problem.
Thank You very much.
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Attachments:
NI_SW_Buffer_Question1.txt ‏2 KB

Hi Felix,
The best architecture for this application would be to have the C++ program divided into two threads. One thread is continuously acquiring data and placing it in a queue. The other "handling" thread will read data from the queue and serve it up to your LabVIEW application.
Much better than using the Code Interface Node, build the C++ application into a DLL. You can then call a function from your LabVIEW program to start the acquisition, and then calls to the handling thread function will return data to LabVIEW.
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Regards,
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Applications Engineer
National Instruments
http://www.ni.com/support

Fastest array operations on a 2D circular buffer

I'm trying to create a a type of circular buffer on large-ish set of 2d data which are samples of voltage from a data acquisition board. The boards are Measurement Computing and a lot of the nice programming features built into DAQmx for NI boards aren't easily available to me.
I'm grabbing chunks of samples, 1000 per channel * 64 channels, every 100ms. I'm calling this a 'page'. For each page of samples I take a median for noise filtering and then I publish this median for multiple threads to use. I also want to be able to string together pages of samples as if it were one longer data acquisition, for up to 30 seconds. I'm doing it this way because the threads that are expecting their data every ~100ms can't release these AI boards for long periods of time to allow other threads to use them to perform long scans. The data coming back from my boards is a 2D array.
I have enough RAM available to pre-allocate the memory to hold all these pages and I've been playing with the In Place structures for awhile now and I haven't been able to land on the magical combination that will allow me to replace any page in the buffer. It's easy enough using the subarray option of the in Place to replace either the first page or the last page but it gets more complicated to do a page somewhere in the middle without having to resort to Case statements. I tried to do it with nested In Place structures but it seems as if the subarrays that get created in the lower levels already go out of scope by the time the top level gets it assigned and I just get jibberish on the output side. Does this make sense?

SmokeMonster wrote:
I tried to do it with nested In Place structures but it seems as if the subarrays that get created in the lower levels already go out of scope by the time the top level gets it assigned and I just get jibberish on the output side. Does this make sense?
Sorry, but at least to me, this doesn't make sense. Can you post your code? I can't see how "out of scope" is a concept that applies here - LabVIEW keeps track of the memory for you and should never lose track of memory that's still in use.
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How to buil a circular buffer of message

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One way would be to have the serial port read in one loop, placing the received messages onto a queue, with the writing done in another loop, popping the messages off the queue as needed. Of course, if you are "loading" the queue every 30 seconds, and "unloading" the same amount only every 90 seconds, you will eventually run out of storage, filling up the predefined queue size. So you will need to determine how long that would be, and how you want to handle it. This is a problem that will occur with whatever method you use, also understanding that the longer you run, the further behind the actual GPS location data you will be. In LabVIEW 8.x, click "File" and New, there is an example of a producer/consumer architecture.
Message Edited by LV_Pro on 01-27-2009 01:28 PM
Putnam
Certified LabVIEW Developer
Senior Test Engineer
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Enumeration with Circular Buffer

Hi, im having trouble with the enumeration of Circular Buffer .
I had compilation errors with the Ring Buffer Class, it keeps pointing to public Enumeration elements () {return new RingBufferEnumeration(this);}
Any advice ? Thanks
This is the RingBufferEnumeration Class code
public class RingBufferEnumeration implements Enumeration {
private RingBufferNode firstFree, firstFilled;
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          firstFilled = firstFree;
          firstFree.next = firstFree;
public boolean hasMoreElements(){
return firstFilled != firstFree;
public Object nextElement () {
return firstFilled= firstFilled.next;
}this is the Ring Buffer Code
public class RingBufferQueue implements Queue {
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      * @return an <code>Enumeration</code> that will yield the elements of the collection
      * @see java.util.Enumeration
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      * access the first value in collection
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     public Object getFirst () {
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      * remove first value in collection
      * @exception java.util.NoSuchElementException no matching value
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          if (firstFilled == firstFree) throw new NoSuchElementException();
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im not sure is it a RingBufferNode but, im sure it is not indexed data for ring Buffer
My IndexDeque is working correctly
public Enumeration elements () { return new IndexedEnumeration(this); }IndexedEnumeration
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}

I'd like to know how I can acquire a waveform on a loop and do a circular buffer with this waveforms I will acquire, cause I want to reduce the noise.

I'm using trigger for this data acquisition.

deco,
If you really want a circular buffer, how much data do you want it to hold? One acquisition? Two? Three? Once this is decided, you will need to create the waveform and then continuously strip the old data out and place the new data in. This will add a bit of overhead to your VI.
There are also software noise filters in LabVIEW that you can use to reduce the noise in your signal.
Lastly, if there is a lot of noise, you may want to consider an SCXI system which will filter out most of the noise as the data is being acquired.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask

Circular buffer error with DIO32HS

Hello,
I am using a DIO32HS in pattern buffered I/O with external clock in Labview and in Visual C.
I lose a sample when the circular buffer has wrapped the first time. It is always the 17th sample after a full buffer. If I change the buffer size, it moves along.
I tested it in Labview 6i and with Visual C. I can repeat the test and the error is always in the same spot. There are no error warnings, not in Labview or in C.
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Hello,
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support. For contact information visit www.ni.com.

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Attachments:
SANDU_SUNITHA(29_Apr_2013).doc ‏176 KB

Functions in IMAQ Vision for Labview same as those in Vision Builder?

Hi all...
i just have a simple question..Does IMAQ Vision for Labview has the same functions of Vision Builder?
I know that with Vision Builder you can develop an application interactively...but does it has more functions than IMAQ Vision?
So if i buy IMAQ Vision can i develop the same kind of applications that i would make with Vision Builder?
I´m specially interested in color matching and color analisys functions.
Thanks

IMAQ Vision has much more than Vision Builder. Basically, VB was created using Vision and they implemented a good number of the functions in a menu driven format. However, there are many more functions available that were not integrated into VB.
Vision does have some good color matching and analysis tools.
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Bruce Ammons
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