detection of task over DIO

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  This has happened

  A few times a week

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  See this:
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• Redeclenchables buffered count task of edge

  Hi all

  I worked on 'Buffered Retriggerable counting task dashboard' on a single window input channel, let me describe what I want to achieve:

  Create a CI to count the rising edges finished with the (for example external sample clock Dev1/di/SampleClock) at some rate of sampling and CI.edge.Term together in a PFI which is wired to another channel of digital input. In addition, I would like to define "start redeclenchables trigger" for this CI by another PFI line.

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  Set the THIS ongoing task - it won't take samples when the task finished di which is actually the same thing as having a task over redeclenchables CI triggered.

  If you want the count to reset each trigger, you could configure the entry as a Reset counter line well trigger.

  Best regards

• Error reading DAQmx multichannel. DAQmx believes that there are several channels in my task.

  Hello

  I get the error message added when you try to use my VI DAQmx Read.  LabVIEW tells me that I'm trying to read a single channel when my task is configured for multiple channels.  However, as you can see in the task panel, this is not the case!  If I try to use DAQmx Read to generate a waveform with many channels, the VI runs without error, but I don't want a picture of waveform 1 d...  Any tips?

  Kind regards

  Steve

  Without seeing the code all I can offer only a possibility.

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  I'm having trouble with this unique analogue read. The situation is the following. I have a thread that executes a task. The task runs for continuous, but sometimes based on acquisition

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  This function is also called via a timer to get a temperature and a resistivity of reading. The timer calls are interested in the temperature and the pressure of the button wants the resistivity.

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  I use v9.0 CVI. I use the USB DAQ 6259. The "BOLD" area below is where the error occurs.

  int daq6259ReadCuvette(float64 data[2])
  {
  Int32 daqError = 0;    DAQmx error code
  errorMsg tank [ERRORMSGSIZE]; error message
  int start = 0;     start time
  passed int = 0;    elapsed time
  float64 * cuvetteData;     data
  Seek_set Int32 = 0;    number of analog readings
  errorCluster localError = {0}; structure of local error to store error information
  allocate memory for the data of the Bowl
  If ((cuvetteData = (float64*) malloc (NUMCUVCHANNELS * sizeof (float64))) == NULL)
  memory allocation of {failed
  errorEnqueue (1, -1, __LINE__, __FILE__, "Bowl DAQ task Memory Allocation Failed");
  Returns - 1;
  }

  cuvetteReady (1); define the ready indicator = 1 to stop the task of daq1 in daq1 wire
  Start = clock(); set a start time
   
  While (cuvetteReady (2)) //poll for the tank handles or timeout if the wait is > 5000 ms
  {
  If (gMpvsError)
  Returns - 1;
  Sleep (100);     sleep 1ms to record usage of the processor
  WAIT 1 DAQ LOOP UNTIL SYSTEM SHUTDOWN
  elapsed = clock() - start;
  If (time > = 5000) //check for 5 seconds timeout during the stoppage of work daq1
  {
  errorEnqueue (1, -1, __FILE__, __LINE__, "cannot stop the device DAQ, Bowl was unread");
  cuvetteReady (1);  the ready value = 1 signal to restart the task daq1 in daq1 wire
  Returns - 1;    Returns - 1 as a standard error code
  }
  }
   
   TAKE THE READING OF THE BOWL!
  If ((daqError = DAQmxCreateTask("",&gCuvetteTask)) == 0) //create Bowl read task
  {//create voltage channel
  If ((daqError = DAQmxCreateAIVoltageChan (gCuvetteTask, cuvChan,"", DAQmx_Val_RSE,)))
  (MINVOLT, MAXVOLT, DAQmx_Val_Volts, NULL)) == 0)
  {//DAQmx analog read
  If ((daqError = DAQmxReadAnalogF64 (gCuvetteTask, 1, 10, DAQmx_Val_GroupByScanNumber,)))
  cuvetteData, 1 * NUMCUVCHANNELS, & Seek_set, NULL)) == 0)
  {
  If ((daqError = stop6259DaqTask (& gCuvetteTask))! = 0)
  {
  DAQmxGetErrorString (daqError, errorMsg, 256);
  errorEnqueue (2, daqError, __LINE__, __FILE__, errorMsg);
  }
  If ((daqError = DAQmxClearTask (gCuvetteTask))! = 0)
  {
  DAQmxGetErrorString (daqError, errorMsg, 256);
  errorEnqueue (2, daqError, __LINE__, __FILE__, errorMsg);
  }
  }
  }
  }
  the ready value = 1 signal to restart the task daq1 in daq1 wire. He will leave the while loop
  in threadManagement waiting for the task of the toilet read of the Cup.
  cuvetteReady (1);
   
  If (daqError! = 0) //check DAQmx error
  {
  DAQmxGetErrorString(daqError,errorMsg,256);
  errorEnqueue(1,daqError,__LINE__,__FILE__,errorMsg);
  error return;
  }
   
  If data (Seek_set > 0) //set VAT values read
  {
  Data [0] = cuvetteData [0];   value of resistivity
  data [1] = cuvetteData [1];   the temperature value
  }

  return 0;        No finished errors
  }

  He was crashing at the same point over and over again. Essentially, in order to reproduce this scenario, you have a thread that is running with a task that runs continuously, so you want to stop and

  start a new task with a single read analogue.

  Could you go through this list of 7 possible causes (of the knowledge base) and see if any of those who are causing it?

• Detection of changing DAQmx online PFI (unbuffered)?

  Hello!

  I'm developing a detection of change on a line of digital input to a software event trigger.  I use the PCIe 6321 DAQ board.

  It works well with an IO line buffered (i.e. any line of port0, see extract of code). However, as I need the lines buffered for other tasks, I would use one of the lines, PFI (port 1 or 2).

  Now, if I use for instance port1/line2, I get error-201062: "selected lines do not support buffering operations. Ensure that lines are supported buffering operations are used in the task. If you use the calendar to change detection, the task should be replaced by without buffer to support these lines. »

  So, is there a way to make the detection of change on a line without buffer?

  I have searched the web for help and resources, but did not find anything useful.

  I would be happy to advice or suggestions.

  Best regards

  Sebastian

  

  No, only non - PFI port 0 lines will support the detection of changes in hardware.  Otherwise, you're stuck with the search on ports software 1 or 2, with a limited time resolution and no guarantee to catch all the changes.

  -Kevin P

• display the date in the task bar

  I bought a new netbook for my wife and see that the date is now displayed in the bar tasks over time.  How to display the date like this on my laptop more old?

  Hi Dlthrasher,

  ·         Did you do changes on the computer before the show?

  Follow the suggestions below for a possible solution:

  Method 1: I suggest you to check the date and time settings in control Panel. You can see the article for more information:

   

  Change the display of dates, times, currencies, and measures

  http://Windows.Microsoft.com/en-us/Windows-Vista/change-the-display-of-dates-times-currency-and-measurements

  Method 2: Try the SFC (System File Checker) scan on the computer.

  How to use the System File Checker tool to fix the system files missing or corrupted on Windows Vista or Windows 7

  http://support.Microsoft.com/kb/929833

  Let us know if you need more assistance.

• How to stop Audio recording when no sound is detected

  Hello friends,

  I want to develop the application which is record audio (implementation of this part, I already had)... but I want to stop recording when device has been not detect any noise over 2 sec audio...

  I already convert the data byte in data short tosigned that is giving me the length of the sound...

  int level = (signedShortToInt (b) * 100 / 32767); b is the data buffer

  mutable public static int signedShortToInt (byte [] b) {}
  result int = (b [0] & 0xff). (b [1] & 0xff)<>
  return the result;
  }

  I'm familiar with the sound of noise of air is in normal recording...

  Air noise level not more than 100 (im guessing).

  so I had checked the voice level is below 100 it will stop recording...

  My idea is correct or not?

  private void jesuissuper (byte [] buffer) {}
   
  for (int i = 0; i)< buffer.length;="" i++)="">
  Byte [] b = new byte [] {[i] buffer, buffer [i + 1]};
  int level = (signedShortToInt (b) * 100 / 32767);
  If (100 > level) {}
  Voice.StopThread ();
  }
  }
  }

  My Question is... How can I stop the recording when the level is low up to 2 sec and it is the Correctmethod to find the sound level?

  Hello guys,.

  I have not found any Solution for this so I drop this idea...

  I had found my solution up to convert PCM ampltude data... Using the Amplitude level I can is find the noise data and hat is given voice. and stop Audio in usin it

  But not audio recorded in the camera store...

  Thank you...

• Synchronization of two inputs frequency meter with several analog inputs

  Hi all

  I'm relatively new to LabVIEW and I'm trying to collect data from multiple sources with calendar sync on the acquisition, but I can't understand. My problem is that I have two inputs frequency meter, an optical tachometer reading one pulse per revolution and a max flow meter machines with a 12000 k coefficient. I can't find a way to synchronize the calendar with my multiple analog inputs. I tried to first get the speedometer to synchronize with the analog inputs following the example linked here. (https://decibel.ni.com/content/docs/DOC-10785) So far every time I run it I get an error on the DAQmx read timeout or an error "several sample clock pulses have been detected" (see image).  It seems if I slow the way to down to say 10 hz and make sampling rate ensure that the tachometer signal is more than 800-1000 rpm (13-17 Hz) before starting the VI then the program will run without error until the ROTATION speed is below this threshold, then the "sample Multiple clock pulses" error occurs.  The code is attached below.

  Does anyone know of a better way to synchronize the entries of frequency of the counter with analog inputs?  I would like to have a VI that can display 0 RPM (and possibly 0 flow as well, but I think I need to understand the timing of a meter before I have add another, because it seems that I can't have two counters to the same task). Any help on this would be greatly appreciated.

  LabVIEW version 13.0

  Chassis cDAQ-9178 with NI 9401 for both counter inputs and NI 9205 for the analog inputs.

  Thank you!

  Richard

  I know the error requires to restart the task at least (this particular error puts the material in a State that cannot be recovered from during execution of the task - I've been down this road before) but I'm surprised that you would have to delete and re-create the task altogether.  And then I had to do this to workaround other questions in the past.  It is awkward and should be considered a bug, if this is indeed the behavior.

  Honestly, regardless of this bug, the way the material dealing with the situation of several sample clock edges makes measures of sampling frequency clocked essentially unusable for purposes of synchronization (in my opinion anyway) If you encounter a more slow than your sample clock rate.  You are supposed to be "synchronization" of the measure, but it really no longer applies if you have to restart the task over and over again (if you must delete it or not).

  Workarounds can get kind of creation (which isn't really a good thing).  For example, you can configure a measure of implicit frequency to keep a buffer of frequencies and use a leader board task (source is the frequency signal, sample clock is the sample clock HAVE) to establish a correlation between the index of your buffer of frequency for singing HAVE sample clock.

  Best regards

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  I hope that it is considered a feature request.

  Thank you.

  Looks like a bug has been files https://bugzilla.mozilla.org/show_bug.cgi?id=661271 perhaps you can vote for her!

• Stalls of the PCF, spinning ball, can't do the instant capture

  I have my library on an external drive.  When I go to make instant great project, it crashes.  It can also block by choosing just part of an audio file

  in the timeline.

  I had just turned computer market with no other programs running.  How wrong what? I can work on the project, but unable to save it.

  Another thing that happens is when FCP opens, it runs a task over and over again, about once per second for

  go from 0% to 100%, then repeat.  Whatever it is, it does not interfere with editing.

  Model name: iMac

  Model identifier: iMac11, 3

  Processor name: Intel Core i5

  Processor speed: 2.8 GHz

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  I also highly recommend hit you your RAM up to 16 GB.  8 is the bare minimum and really not enough for serious editing.  And do not forget that your libraries and media are on an external drive, which is fast.  As USB 3.0 (if you iMac supports that) or love at first sight.  Finally, remember all the connected readers have at least 15% of their total capacity, each, left as open space.

• With PCI-6229 NMI Parity error

  Currently, I'm trying to get a PCI-6229 to work with one of our lab computers. We'll use LabVIEW 8.5.1 with DAQmx 6.7.1 to program the card. Using our measurement VI owner, the computer will crash at some point (not really in reproducible way) with a blue screen saying "NMI: Parity Check / Memory parity error. All the tests of auto and examples of NOR (delivered with LabVIEW) perform well however.

  Most likely, this problem is not a RAM issue (MemTest I tried, different memory chips, different memory banks). Also, the PCI computer bus works very well otherwise (for any other acquisition cards for example). Annoying enough, the card seems to do a great job in an old and slow computer. Which is maybe something to look at? Or are there other ideas?
  Our workplace is a Fujitsu-Siemens of Celsius M460 with BIOS version 6.00 rel. 1.09 running Windows XP (32-bit version). The software to use with the card is LabVIEW 8.5.1 with DAQmx 6.7.1.

  Dear Lutz,

  I could reproduce the blue screen, and
  changed your program in order to avoid the race condition. What is
  actually happens is you want 2 tasks over time the
  AOSampleClock as a source before the task of AO started.

  When
  programming as in the example I sent you (see attachment VI), you
  shouldn't deal with this blue screen problem more. However, I recognize
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  Merry Christmas,

  P. Lawrence

  National Instruments

• How to change DI unbuffered mode

  My request is when a fall from digital input (camera ready) edge arrives, it will trigger a pulse counter 0, open the shutter of camer.

  The following code does this:

  camShutterOutputTask.COChannels.CreatePulseChannelTime ("Dev1/ctr0", "",)
  COPulseTimeUnits.Seconds, COPulseIdleState.Low,
  0,
  0.000001,
  (((double) exposure_time) / 1e6);
  
  camShutterOutputTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Falling);
  
  camShutterOutputTask.Triggers.StartTrigger.Retriggerable = true;

  On my PCIe-6323, PFI0 is by default configured with P1.0, so I connected physically ready to P1.0 camera entry.

  I just want to trigger the camera several times. After the required number of triggers, I'll just ignore all the following input signals. The following code configures the input channel to do so:

  camReadyInputTask.DIChannels.CreateChannel ("Dev1/port1/$line0", "", ChannelLineGrouping.OneChannelForEachLine);
  () camReadyInputTask.Timing.ConfigureChangeDetection
  
                     "",
  
                     "Dev1/port1/$line0,"
  
                     (SampleQuantityMode.FiniteSamples, num_of_frames);

  The problem is when I run the program, I get the error: "some lines do not support buffering operations. Ensure that lines are supported buffering operations are used in the task. If you use the calendar to change detection, the task should be replaced by without buffer to support these lines. »

  If I use port 0 in the code instead of port 1, he makes the mistake, and it limits the number of input signals just like what I need. However, port 0 is not connecting to any PFI, so I can't use it in the trigger to start for the shutter of the camera.

  Does anyone know how is:

  1. change a task in unbuffered mode or

  2 re - router port 0 to a PFI?

  Thanks for the reply Ashly. I'm new to DAQmx and there is still a lot to learn.

  The loop thing involves waiting timed software and concerns me.

  I have found a workaround that calls a callback function whenever the meter changes its output:

  camShutterOutputTask.SynchronizeCallbacks = true;
  camShutterOutputTask.CounterOutput += new CounterOutputEventHandler (camShutter_callback);
  
  ...
  ' Private Sub camShutter_callback (object sender, CounterOutputEventArgs e)
  {
     trigger_count ++;
     Console.WriteLine ("trigger count =" + trigger_count. (ToString());
     If (trigger_count > = num_of_frames * 2)
     {
        Try
        {
           camShutterOutputTask.Stop ();
           camShutterOutputTask.Dispose ();
  ...
  startCaptureButton.Enabled = true;
        }
        catch (System.Exception Exception)
        {
           MessageBox.Show (exception. (Message);
        }
     }
  }

  In camShutter_callback(), I continue to follow a global counter and if it is greater than num_of_frames * 2 (since the callback will be triggered by rising and falling pulse edge), I stop all tasks.