NI 6341 buffer problem

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• Satellite P500 - keys open 'find' / 'search' - number NOT used

  * information system *: BIOS Version/Date TOSHIBA V1.60, 26/05/2009: Vista SP1: windows explore 8: 64 bit os: laptop Toshiba Satellite P500: computer is less than 1 mth old

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  > 1. Keys not 'use' numbers... when any number on the numeric keypad is indexed it activates > field 'Search' or 'search' to the program I use.
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  Best regards

  Felix Turner

  Hi Felix,.

  Welcome to the forums EITHER!  The part of the synchronization of your code seems pretty good assuming tasks of HAVE and AO are running on the same device - you are triggering one task out of the other, so they should start at the same time (if they are the same device, the time will be the same for each clock so you shouldn't get any drift over time).  Another way to synchroinze the two tasks (because they're going at the same rate) would be to simply share the sample between tasks clock.

  A few problems I see with the code:

  I think that problems of buffer problems come from the fact that the tasks of HAVE and AO are in the same thread.  DAQmx Write is a blocking call, so in your code it prevents DAQmx called Read until enough space became available in the buffer output to write the desired number of samples (1000 in your case).  In the meantime, looks like the analog input buffer is completely filled.  You could try to increase the size of the buffer, but you can also consider the two tasks running in parallel loops.

  In addition, samples of reading (-1) will return some data are in the input buffer.  It would probably be a different number of the number of samples that you write by loop iteration, so the data may appear sync when it is read.

  With respect to the number of samples to read and write by loop update, it is editable running so everything you need to do is put the control inside the loop (you can put a local variable outside of the loop to the initial settings).

  The PCI clocks rate, I / ao sample is not modifiable at run time, but what you can do is to use a meter to generate a sample for both tasks clock (just use the internal output as the sample for each task clock).  This example shows how you can change the rate of a performance counter on the fly.

  Put it all together, here's what I'll try:

  I would put both DAQmx tasks in parallel loops. Instead of sharing a trigger of departure between the two tasks, use one of the counters to generate a variable frequency sampling clock to use.  The tasks of HAVE and AO must begin before the meter.

  You should also probably use the number of samples to read the DAQmx Read entry so that each iteration of the loop will be matched with the data written in the previous iteration of loop AO.  If you are not careful when implementing the variable number of samples to reading parameter, you could end up with a race condition where single loop updates to read samples and the other is not updated until the next iteration.  Usually Of functional Global Variables are used in situations like this, but another idea might be to adjust the size of the buffer AO so that we can ensure that the loop AO will always run before the loop to HAVE it.  You can place the control inside the loop of the AO and the local variable inside the loop to HAVE it.

  Feel free to post if you have any questions!

  Best regards

  John

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  Greetings,

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  Ok. So I solved my problem with a co-worker, but he had a miserable time. I think that the VI attached work a LiCor-820. I think that you can fix the buffer problems of overflow to everything in a while loop with an error handler. Basically, the error handler can prevent display errors, and at the same time, it can also make a stop or continue the condition for the while loop. I chose to continue after deletion of the read buffer until it wasn't a mistake. I took a loop because the data on the first launch is usually just a partial reading of the data set is past the LiCor. I know that this probably isn't the most elegant solution, but it works for this situation so far.

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  Hello

  Here is a link that should prove beneficial to get a resolution to your inquiry.

  Card game

  http://us.Blizzard.com/support/article.XML?locale=en_US&articleid=20767

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  http://forums.battle.NET/Board.html?forumid=12014

  Patch for Diablo 2

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  I hope that this information is beneficial.

  Thank you

  Aaron
  Microsoft Answers Support Engineer
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