Add data to an [existing] the AnalogWaveform < Double >

Hello

I'm the life-long tension using DAQmx scene, and I am puzzled as to how I can add new samples in an existing array of waveform.  Whenever I run my program, I receive only 1000 samples of data in the AnalogWaveformarray.  Because I need to do some calculations after each asynchronous reading, I wish I had the waveform table 'accumulate' data until the acquisition stops.  Then, I can trace the entire waveform.  Is this even possible, or do I just store the data in a WaveformPlot?  Any suggestion would be appreciated.  Thank you!! Here's my code for callback:

public void ReadCallBack_MeteringTask (IAsyncResult ar)
{
Try
{
If (runningTask is ATR AsyncState)
{
read data
AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

cancel the acquisition if channel trigger is not valid
If (triggerChannelIndex < 0="" ||="" triggerchannelindex=""> = meteringTask.AIChannels.Count)
{
meteringTask.Dispose ();
runningTask = null;
System.Windows.Forms.MessageBox.Show ("Invalid trigger channel index.");
return;
}

continue to acquire data until the short-circuit has been detected
shortCircuitInitiated = IsShortCircuitInitiated (waveforms, triggerChannelIndex, desiredLevel);
If (shortCircuitInitiated)
{
short circuit detected, read more and stop acquisition
daqReader.MemoryOptimizedReadWaveform (desiredSamplesPerChannel, waveforms);

Stop the task
meteringTask.Dispose ();
runningTask = null;
return;
}

Read the next set of samples
daqReader.BeginMemoryOptimizedReadWaveform (desiredSamplesPerChannel, callBack, meteringTask, waveforms);
}
}
catch (DaqException ex)
{
meteringTask.Dispose ();
runningTask = null;
System.Windows.Forms.MessageBox.Show (ex) Message);
}
}

Hi Eric,.

Unfortunately, it seems that the AnalogWaveform data type has no the possibility of adding a waveform, mainly due to the uncertainty as how to manage with different timing waveforms.  In your case, since it is still the timetable, we should be able to piece together a solution.

First of all, note that AnalogWaveform[] is an array of the data types AnalogWaveform returned by the function of data acquisition.  The table represents the number of channels that is to measure your task of acquisition.  This example I can give you is for a track, but you should be able to extrapolate in several channels.

We must create a global variable of AnalogWaveform that will maintain the variable information.  Then, whenever your function will run, you must add the information of waveform at the end of the global variable.  Due to some restrictions in the type of data, we must do a few things to work around this problem, but hopefully the example code below is clear.  If it isn't, please answer any questions you may have.

public AnalogWaveform = new AnalogWaveformglobalWaveform (0); //set to 0 because it is resized subsequently

....

AnalogWaveformof the waveforms [] = daqReader.EndReadWaveform (ar);

First, you must create a temporary variable waveform that is as large as the existing data stored in the global data as well as the size of incoming data

AnalogWaveform tempWaveform = new AnalogWaveform(globalWaveform.Samples.Count + 100); //replace 100 with the known size of your waveform that you read in the previous step

Then, you must copy the waveform timing information.  Given that your calendar information will not change, we can just do this copy every time your code runs

tempWaveform.Timing = [0] of the waveforms. Calendar;

tempWaveform.PrecisionTiming = [0] of the waveforms. PrecisionTiming;

tempWaveform.ScaleMode = [0] of the waveforms. ScaleMode (ScaleMode);

Then we need copy the existing data from the globalWaveform to the largest temporary variable.  This must be done because there is no way to add to the global variable.

int index = 0;

for (int j = 0; j)< globalwaveform.samples.count;="">

{

tempWaveform.Samples [index ++]. Value = globalWaveform.Samples [j]. Value;

}

Finally, it copies the data from the new waveform, read in the tempWaveform variable.  This means that tempWaveform is a local variable which contains the entire waveform.

for (int k = 0; k)< waveforms[0].samples.count;="">

{

tempWaveform.Samples [index ++]. Value = [0] of the waveforms. Samples [k]. Value;

}

The last step was we do globalWaveform repoint towards the entire waveform.  When this function is out of reach, the data will always exist because globalWaveform is pointing to it.

globalWaveform = tempWaveform;

Tags: NI Software

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