Number of items in the target to host DMA FIFO

Similar Questions

• Target to host DMA FIFO not compensation when they are arrested

  I use a PXI-7841R (Virtex5) and 32-bit data to the host via DMA FIFO transfer. When you read the FIFO on the host for the first time, the data are "stale" (which means that it is not what is currently coming in the FPGA, but what came in a few seconds ago stale). I tried both a stop and a configuration for clear memory FIFO before I use them. Documentation on one or both of these so-called clears the target and host the FIFOs. Does not help in both cases. With readings of the second and the following, FIFO has then 'valid' (same data as it appears on the FPGA entry node). What is curious is that each reading exactly the same thing:

  1. Stop the FIFO (must erase all data)
  2. Elements of reading 375 of the FIFO. (repeated playback of the FIFO)

  Also interesting: FPGA FIFO is implemented for 255 elements. The first 255 items host-side contain the data "stale" on the first reading. It reminds me of the never erased FPGA FIFO.

  Answered by support OR. The documentation for the FIFO, stop and configure FIFO is in error. Cars of documentation will be written against them.

  Solution:

  These methods remove only the FIFO on the side host. Data FPGA FIFO must be read following until no element.

• Target to host DMA FIFO - actual number of items

  Hello

  I have a target of FIFO of DMA host using memory block. Under FIFO properties, "the actual number of elements" is indicated as part of 1023.

  But when I wire a remaining indicator to the 'elements' of FIFO in the host of VI, said 16384 elements. And I read a lot of part of the FIFO.

  Why is the actual number of items that much more?

  The data type is 32. And I have a high-7965R FPGA.

  See you soon.

  There are two different buffers for the FIFO: one on the host, the other on the FPGA.  Data is copied from one to the other.  It may be more space allocated on the host, because there are more memory available here and the loop of the host, probably runs more slowly than the FPGA.  You can set the host using a node to invoke FPGA FIFO set the buffer size value.

• has bought 11 items to the target, got the serial number but how to download?

  has bought 11 items to the target, got the serial number but how to download?

  Download the trial of l http://prodesigntools.com/photoshop-elements-11-direct-download-links-pse-premiere-pre.htm and use your serial number to activate it.

• Display the number of items in the Favorites/Wishlist?

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  I would like to have a link to my page of favorites in my head that would show a total of points inside.

  My Favorites (3) | Close the session

  Can someone help me?

  Hey Evan,

  Check this how-to to learn more about this point - developers

  It is perhaps not exactly what you are looking for, however, is how you should speak and with some improvements in the code, you should be able to implement what you are looking for.

  - Abhishek Maurya

• How to remove the number of items in the history, bookmarks...

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  also how to cut, copy, paste items on web pages.
  . Is there a program like Snagit as eorks on samsung Tablet?

  Go to the menu then settings and find "clear privΘes.

• Change the number of items in the drop-down list box when running

  I'm trying to change the number of items in one of my boxes of comobo.

  I have been through the help and this forum and have the values to within the drop-down list box change very well, but in a scenario, I want to go to three options for 2. And according to other choices to 3.

  I guess I have to use a property node but I can't understand that one.

  You can use the method to reset to zero (using an invoke node) before setting the [Strings] (after setting the value by default an empty array) or create an Xcontrol (you can see examples of LabVIEW for xcontrol).

  Ben64

• How get the number of items in the ListView inside QML?

  QML/JavaScript newbe question here please.

  Suppose I have .qml

  import bb.cascades 1.0
  
  NavigationPane {
      id: navigationPane
      Page {
  ...
          Container {
  ...
                ListView {
                      id: listviewPlayers
  ...
  

  and I want to do something if ListView does contain all of the elements

      onCreationCompleted: {
          // this slot is called when declarative scene is created
          if (listviewPlayers.AllItems.count() == 0){
              // do something;
          }
  

  but when I run the present I get complain AllItems is not defined in this line:

   if (listviewPlayers.AllItems.count() == 0){
  

  What I doing wron? I can do the same thing in C++ without any problem.

  Thank you.

  Oh, this thing AllItems seems to be a 'Sentinel' or a magic value used in special cases, unrelated to this.

  I think that ListView manages all this, but defers everything to do with the pieces of data to the model, you don't have to go to the model for the data. ListView knows how VisualNodes (the components list item) he created at the time of the display on the screen, but also have to tell you the total number of elements in the model would simply duplicate work. (The reasoning behind this interpretant.)

• Number of items in the pipe delimited string by the

  Hello

  Is it possible to count the number of items produced by LISTAGG?

  For example, if product LISTAGG:

  Jan, Feb, Mar: output should be 3

  Jan, Mar, Apr, Dec: output must be 4

  Hello

  I see it; LISTAGG has nothing to do with this problem.

  REGEXP_COUNT can tell you how many times a particular pattern occurs in a string:

  SELECT REGEXP_COUNT (delim_str, "[^ |]") +') AS num_of_months

  delim_str

  OF tmp_table

  ;

  Output of your sample data:

  NUM_OF_MONTHS DELIM_STR

  ------------- ----------------------------------------

  4 jan | Feb | Mar | Apr

  5 jan | Feb | Mar | Apr | May

  6 jan | Feb | Mar | Apr | Can | June

  7 jan | Feb | Mar | Apr | Can | June | July

• FPGA target host DMA FIFO multi-channel

  Hi people,

  I have a little trouble to collect my FPGA application data. The control of my FPGA application loop is running and read data from set point between a host and target FIFO to a period of 50 uSec. I run a separate loop to write data collected form two channels in a target of FIFO host over a period of 1000 uSec. I'm taking the data from both channels and its reading on the host in bundles of 500 data samples. The first problem I have is that my method of reading times unless I put my data acquisition loop to run at a much slower pace. My FIFO depth host side is 60000, almost as large as the total number of data samples that I expect to collect in total.

  I have another problem when trying to write the data to a table. Even if my method of reading does not expire, I don't think that will record the first beam of data that are read. I've initialized an empty table outside my acquistion of the side loop host and used the table VI build to take the current data set and add it at the end of this table. I then store in a shift register and pass it in the next iteration where I try to join the new data set to the old and so on. I expected to get a table with all the data, but as I said I'm only collecting the first set of 500. I wonder if my program structure is correct. Any help anyone could offer would be greatly appreciated. I have attached a few pictures of my reference request. Thank you.

  Hi Daniel,.

  Thank you for your response. I think I found a solution to the problems that I had. Looks like it was a combination of a couple things. First, the data acquisition loop was running not until the movement was already over since I plugged the condition to stop the loop of writing deposit directly on the data read loop. This problem has been fixed by creating a shared variable for the stop condition and it wiring to two loops independently. This explains why I got only the first set of data, as it was stored in the FIFO until the end of the movement. However, the FIFO of feedback was still time. Before attaching the stop condition error, I placed a probe on the "items remaining" wire of the read method and concluded that there was only 1023 elements (the depth of the FIFO on the side FPGA) even if I set the FIFO depth host side to 60000. "» I realized it was originally due to the Read method not called for the first time until the end of the movement. Although the problem of break for most fixed condition this problem given that the Read method was now called during the movement, I decided to take a preventive measure and calling the 'Start' before the movement FIFO method is started just to make sure that the memory of PEP on the side host is available immediately.

  So yes, it turns badly I put sync settings have been well after all. Good call on the reversal of the order on the Array function to build. Oh, and I also had to move the waveform diagram to until the table is built so that it is not Replot the old data on top of all the new data it receives. On the same note, I moved to the indicator in table at the end outside of the loop of reading. Thanks again for your help.

  Kind regards

  John has

• Reading of the zeros of a DMA FIFO empty

  Hello

  I'm having a problem using the DMA FIFO to communicate between my real-time system and my FPGA. I use two DMA FIFO, one-way to the FPGA of the RT system and then vice versa. I can successfully get data to and from each system; However, before, after and sometimes inbetween my data, I'll get a seemingly random assortment of zeros. In the latest version of my code (which I have provided) I read the number of items stored in the DMA FIFO and read only this number to my RT system to try to get the data that I want and no zeros, but this does not work either.

  I'm new to both in real-time and FPGA and so it certainly feels like I'm missing something very basic. I tried dealing with this problem by myself well and have had absolutely no success and would appreciate any help.

  My equipment includes:
  A Dell laptop (used as a host of the user interface)
  1082 chassis
  Controller of 8133 (running the LabView RT operating system)
  7965R FPGA
  5781 module for FPGA (not currently in use)

  LabView 2014 SP1

  On the side of RT, you need to use a structure of the case so that you have not read of the FIFO if no data is available.

  I would also like to change the flow of network to be inside of your time in a loop until the user interface capturing each data point, as it comes (connect before the loop, close after the loop and write it as the data come from the inside of the loop).  This will save memory (which is VERY important in a RT system) since you don't have to set up the table.

  You write only as an element in the FPGA.  So any sous-suite readings should give you an array of 0 s, causing 0s back upward.  You must maintain the Timed Out in the FPGA so that the data will only until to the RT when there is real data to send.  Your FPGA code could be reduced to this:

  

• Number of cycles in the target FPGA VI

  Hello to everyone.

  I'm working on a project where I use sb RIO 9636. I subtract a number of past and present of the encoder pulses. Here, I have attached VI that I use as target VI. When I use simulated I/O lets say that the program works correctly. When I compile VI on sbRIO I noticed that the LED indicator named x = y? never flashes (even if she flashes simulation).  Also, when I put indicaton on the number of cycles of control, counting starts from a few very very valuable.

  Could someone help me?

  Thanks in advance.

  Hi Chupka993,

  I suspect that part of the behavior of the that you describe, is that when you change the clock of the loop, you change the speed at which the loop works. As GerdW said, this loop timer setting gives your code a rate at which it should run. For example, defining 1ms means that your code inside this loop executes once per millisecond, or 1000 Hz. ticks would work similarly, but I think the timescale ticks of the FPGA clock which is generally 40 MHz on our devices.

  When you have the timer set to 1 millisecond loop, the code in the loop executes 1,000 times per second, and your iteration count would be 1000 times before update output, which means that your code runs a full 1000 iterations once per second. If you change the clock of the loop of 2 milliseconds, the loop will run 500 times a second sense that your 1000 iterations would take 2 seconds to run. I think that the behavior you're seeing is because the iterations are produce faster that you intend.

  You need to understand exactly how much time it should take your loop to run 1000 times and then set the timer loop to the appropriate value to achieve this goal.

• Number of item in the dynamic Table Quirk

  I am a new user of LC, ramping up the speed on this package, thanks to all for the useful information here and elsewhere.

  By using the tips and info here,

  http://www.assuredynamics.com/wp-content/uploads/2010/11/assure-Dynamics-building-dynamic-tables.PDF

  I added a dynamic array of a form, I've worked on that.  Mostly, everything works, except the legend on the number of line/article.  So I yanked on the subform with the table top to create a single copy of the form to post here.  Get this... it works on the simple form.  So there is something to do in my not so simple form which prevents my line/workstation number.

  I hope if I post here the two forms, can someone help me solve this thing.

  It's the form that works:

  http://inthequeue.com/adobeLC/Template_excerpt.PDF

  It's the shape that doesn't work:

  http://inthequeue.com/adobeLC/Template_std.PDF

  Thanks in advance

  John Q.

  Hi John,.

  Try to change the code in the layout event: ready to go;

  This.Caption.Value.Text = (this.parent.index + 1) m:System.NET.SocketAddress.ToString ();

  TO;

  This.Caption.Value.Text.Value = (this.parent.index + 1) m:System.NET.SocketAddress.ToString ();

  It's adding another "value".

  Your form that works target Reader 8.0 or later and who only targets Reader 9.0 or later, I guess that's the difference.

  Concerning

  Bruce

• number of items in the queue

  I'm working on an upcoming project that will need to use a loop of producer/consumer structure. Right now, I have added a simple test of how I want the VI to work, but I'm having a problem. When I run the VI, the "elements of # in the queue" increases ever from time to time. I used the Undo button to stop execution when the consumer is in an infinite loop (which I know is bad). I'm trying to ensure that all items are consumed and stored in my database.

  Anyone know what is happening with the VI?

  Thank you

  Eric

  
  

• 9219 current conversion on the current value of DMA FIFO sampling

  Hi all

  I'm sampling two 9219 modules (24 - bit universal module) in a FIFO I32 on the FPGA target (9072). I want to convert this example in current value for keying in my host vi. The bed a +/-25 module entered my 24-bit in a 32-bit memory location. I was originally performing the conversion on the host as follows.

  1 ENTRY converted I32, then DBL

  2. (ENTRY * 25) / ((2^24)/2 - 1) = CURRENT (mA)

  3. CURRENT (mA) * SCALE = VALUE

  My values are very high. Any help is appreciated. Thank you.

  Gaussy

  Hello Gaussy,

  Please contact National Instruments!  There are a few questions that I had for you in order to solve this problem.  My first question is what version of LabVIEW you use?  If you use a LabVIEW 8.5 then do you mean instead of I32 U32?  If you use a LabVIEW 8.6 have you thought about trying to use fixed-point, you don't have to worry about the conversion?  Here is a knowledge base article that speaks a bit more on this topic.

  After looking through your conversion algorithm, I couldn't see the specific defects.  I was wondering if you could post the values that you receive from the FPGA target, then the values after your conversion.  In addition, it would be good to know what values expect you and why.  This will help us determine if the real signal of the module is disabled or if the conversion is incorrect.  I hope this helps!  Have a great day!