Control PCLK when using the PXI-6534 in e/s mode

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      Public Sub StartChangeDetect_UUT1()
          If myCDrunningTaskA Is Nothing Then
              Try
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                  uut1ChangeDetectTask = New Task()
  
                  '************************ Create the digital input virtual channel alias
                  'Assign ports to digital virtual channel
                  uut1ChangeDetectTask.DIChannels.CreateChannel("Dev1/port0:3", "ChangeDetectUUT1", ChannelLineGrouping.OneChannelForAllLines)
                  'uut1ChangeDetectTask.DIChannels.All.DigitalFilterEnable = True
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                  uut1ChangeDetectTask.DIChannels.All.InvertLines = True
                  uut1ChangeDetectTask.DIChannels.All.DataTransferMechanism = DIDataTransferMechanism.Dma
  
                  'Assign ports to monitor for change detection, both rising and falling edges
                  Dim rising As String
                  Dim falling As String
  
                  rising = "Dev1/port0:3"
                  falling = "Dev1/port0:3"
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                  'export change detect event to PXI backplane so we can get timestamps from timer.
                  uut1ChangeDetectTask.ExportSignals.ChangeDetectionEventOutputTerminal = "/Dev1/PXI_Trig0"
                  uut1ChangeDetectTask.ExportSignals.ChangeDetectionEventPulsePolarity = ChangeDetectionEventPulsePolarity.ActiveHigh
  
                  'uut1ChangeDetectTask.Stream.Timeout = 20000
  
                  ' Verify the Task
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                  ' Set up the data table
                  Initializeuut1DataTable()
  
                  ' Create the readers for the DI and the CI
                  uut1ChangeDetectReader = New DigitalSingleChannelReader(uut1ChangeDetectTask.Stream)
  
                  uut1CDCallback = New AsyncCallback(AddressOf uut1ChangeDetectCallback)
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                  uut1ChangeDetectReader.BeginReadMultiSamplePortUInt32(-1, uut1CDCallback, uut1ChangeDetectTask)
                  myCDrunningTaskA = uut1ChangeDetectTask
  
                  'Set up Timer for time stamp
  
                  uut1TimeStampTask = New Task()
                  '****************set up PXI-6602 timer to get buffered change events.  ie capture timer output on  the PXI_Trig0
                  'we can then correlate this timer capture buffer to the change detect buffer to get the time stamps
  
                  uut1TimeStampTask.CIChannels.CreatePeriodChannel("Dev5/ctr0", "TimeStamp1", 0.0000001, 0.02, CIPeriodStartingEdge.Rising _
                               , CIPeriodMeasurementMethod.LowFrequencyOneCounter, 4, 4, CIPeriodUnits.Seconds)
                  uut1TimeStampTask.CIChannels.All.CounterTimebaseRate = 20000000.0
  
                  'Use exported change detect from 6534 board to take counter sample
                  uut1TimeStampTask.Timing.ConfigureImplicit(SampleQuantityMode.ContinuousSamples)
                  uut1TimeStampTask.CIChannels.All.PeriodTerminal = "/Dev5/PXI_trig0"
                  'uut1TimeStampTask.CIChannels.All.DuplicateCountPrevention = False
                  uut1TimeStampTask.CIChannels.All.DataTransferMechanism = CIDataTransferMechanism.Dma
  
                  ' Set timeout
                  'uut1TimeStampTask.Stream.Timeout = 20000
                  ' Verify the Task
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                  uut1TimeStampReader = New CounterReader(uut1TimeStampTask.Stream)
                  uut1TSCallback = New AsyncCallback(AddressOf uut1TimeStampCallback)
  
                  uut1TimeStampReader.SynchronizeCallbacks = False
                  uut1TimeStampReader.BeginReadMultiSampleDouble(-1, uut1TSCallback, uut1TimeStampTask)
                  myTSrunningTaskA = uut1TimeStampTask
  
              Catch exception As DaqException
                  ' Display Errors
                  MessageBox.Show(exception.Message)
                  uut1StopChangeDetection("C:\PT3771\TestResults\")
              End Try
          End If
      End Sub
  
      Private Sub uut1ChangeDetectCallback(ByVal result As IAsyncResult)
          Try
              'If runningTask Is ar.AsyncState Then
              If myCDrunningTaskA Is uut1ChangeDetectTask Then
                  ' Read the available data from the channels
                  Dim data As UInt32() = uut1ChangeDetectReader.EndReadMultiSamplePortUInt32(result)
  
                  Dim b As UInt32
                  For Each b In data
                      ' in TestData waveform Y axix is data, x axis is time 
  
                      uut1TestData.SetY(uut1ChangeDataIndex, b)
                      uut1ChangeDataIndex += 1
  
                  Next b
  
                  '' Set up a new callback
                  uut1ChangeDetectReader.BeginReadMultiSamplePortUInt32(-1, uut1CDCallback, uut1ChangeDetectTask)
              End If
          Catch exception As DaqException
              ' Display Errors
              MessageBox.Show(exception.Message)
              uut1StopChangeDetection("C:\PT3771\TestResults\")
          End Try
      End Sub 'DigitalCallback
  
      Private Sub uut1TimeStampCallback(ByVal result As IAsyncResult)
          Try
              'If runningTask Is ar.AsyncState Then
              If myTSrunningTaskA Is uut1TimeStampTask Then
                  ' Read the available data from the channels
                  Dim data2 As Double() = uut1TimeStampReader.EndReadMultiSampleDouble(result)
  
                  ' in TestData waveform Y axix is data, x axis is time
                  Dim b As Double
                  For Each b In data2
                      uut1TimeSum = uut1TimeSum + b
                      uut1TestData.SetX(uut1TimeStampIndex, uut1TimeSum)
                      uut1TimeStampIndex += 1
                  Next b
  
                  ' Set up a new callback
                  uut1TimeStampReader.BeginReadMultiSampleDouble(-1, uut1TSCallback, uut1TimeStampReader)
  
              End If
          Catch exception As DaqException
              ' Display Errors
              MessageBox.Show(exception.Message)
              uut1StopChangeDetection("C:\PT3771\TestResults\")
          End Try
      End Sub 'CounterCallback
  
      Public Sub uut1StopChangeDetection(ByVal location As String)
  
          Try
              If Not (myTSrunningTaskA Is Nothing) Then
                  uut1TimeStampTask.Dispose()
                  myTSrunningTaskA = Nothing
  
              End If
  
              If Not (myCDrunningTaskA Is Nothing) Then
                  uut1ChangeDetectTask.Dispose()
                  myCDrunningTaskA = Nothing
  
              End If
          Catch ex As Exception
              MessageBox.Show(ex.Message)
          End Try
  
          uut1TestData.UpdatePointCount()
          uut1TestData.SaveToDisk("C:\PT3771\TestResults\uut1TestWaveFile.csv")
          uut1TestData.SaveToDiskBinary("C:\PT3771\TestResults\uut1TestWaveFile")
      End Sub 'StopTask
  

  Joe,

  Last updated.  It seems that when the task.dispose is run, recalls seem to have called one last time.  I took the call to the stopUUT1ChangeDetect in the two recalls (so eliminate it would not enforce a second time), and no exception was thrown.

  Thanks for your help!  Although if you'd still answer my question on the PXI-6534 Digital input filtering, I'd appreciate it.

  Thanks again.

  Thad

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