public double ReadDigitalPulseWidth(string counter, CIPulseWidthStartingEdge StartingEdge, double minPW_InSeconds, double maxPW_InSeconds)
{
// This example uses the default source (or gate) terminal for
// the counter of your device. To determine what the default
// counter pins for your device are or to set a different source
// (or gate) pin, refer to the Connecting Counter Signals topic
// in the NI-DAQmx Help (search for "Connecting Counter Signals").
// Uses default PFI 9/P2.1 as the pulse input.
// Returns PW in seconds.
double pulseWidth = 0;
Task myTask = null;
NationalInstruments.DAQmx.CounterReader myCounterReader;
try
{
myTask = new Task();
myTask.CIChannels.CreatePulseWidthChannel(counter,
"Meas Pulse Width", minPW_InSeconds,
maxPW_InSeconds, StartingEdge,
CIPulseWidthUnits.Seconds);
//RLC Wait up to 5 sec default was 10 sec
myTask.Stream.Timeout = 5000;
myCounterReader = new CounterReader(myTask.Stream);
// For .NET Framework 2.0 or later, use SynchronizeCallbacks to specify that the object
// marshals callbacks across threads appropriately.
myCounterReader.SynchronizeCallbacks = true;
// For .NET Framework 1.1, set SynchronizingObject to the Windows Form to specify
// that the object marshals callbacks across threads appropriately.
//myCounterReader.SynchronizingObject = this;
//rlc AsyncCallback myCallback = new AsyncCallback(MeasurementCallback);
//myCounterReader.BeginReadSingleSampleDouble(myCallback, null);
IAsyncResult ar = null;
ar = myCounterReader.BeginReadSingleSampleDouble(null, null);
pulseWidth = myCounterReader.EndReadSingleSampleDouble(ar);
}
catch (Exception exception)
{
mstr_Error = exception.Message;
pulseWidth = -1;
}
finally
{
if (myTask != null)
{
myTask.Dispose();
}
}
return(pulseWidth);
}
public bool ReadDigitalLowFrequency(string lines, string name, double min, double max, double time)
{
// This example uses the default source (or gate) terminal for
// the counter of your device. To determine what the default
// counter pins for your device are or to set a different source
// (or gate) pin, refer to the Connecting Counter Signals topic
// in the NI-DAQmx Help (search for "Connecting Counter Signals").
// Uses default PFI 9/P2.1 as the pulse input.
try
{
m_d_MeasuredFrequency = 0;
Task_MeasureLowFreq = new Task();
Task_MeasureLowFreq.CIChannels.CreateFrequencyChannel(lines, name, min, max, CIFrequencyStartingEdge.Rising,
CIFrequencyMeasurementMethod.LowFrequencyOneCounter, time, 4, CIFrequencyUnits.Hertz);
myCounterReader = new CounterReader(Task_MeasureLowFreq.Stream);
// For .NET Framework 2.0 or later, use SynchronizeCallbacks to specify that the object
// marshals callbacks across threads appropriately.
myCounterReader.SynchronizeCallbacks = true;
myCallBack = new AsyncCallback(CounterInCallback);
myCounterReader.BeginReadSingleSampleDouble(myCallBack, null);
}
catch (Exception exception)
{
mstr_Error = exception.Message;
Task_MeasureLowFreq.Dispose();
return(false);
}
return(true);
}
