// this method configures and starts the counter.
private void StartCounter()
{
// set up the counter - the fast oscillator is fed into a counter's source input
counterTask = new Task("PhaseLock task");
CounterChannel oscillatorChannel =
((CounterChannel)Environs.Hardware.CounterChannels["phaseLockOscillator"]);
counterTask.CIChannels.CreateCountEdgesChannel(
oscillatorChannel.PhysicalChannel,
oscillatorChannel.Name,
CICountEdgesActiveEdge.Rising,
0,
CICountEdgesCountDirection.Up
);
// this counter is sample-clocked by the slow reference that we are locking to.
// the buffer is set to be "large"
CounterChannel referenceChannel =
((CounterChannel)Environs.Hardware.CounterChannels["phaseLockReference"]);
counterTask.Timing.ConfigureSampleClock(
referenceChannel.PhysicalChannel,
SAMPLE_CLOCK_RATE,
SampleClockActiveEdge.Rising,
SampleQuantityMode.ContinuousSamples,
1000
);
counterReader = new CounterSingleChannelReader(counterTask.Stream);
counterReader.SynchronizeCallbacks = true;
if (!Environs.Debug)
{
counterReader.BeginReadMultiSampleInt32(
SAMPLE_MULTI_READ,
new AsyncCallback(CounterCallBack),
null
);
}
}
/// <summary>Read the specified histogram channel range.</summary>
public ushort[] ReadHistogram(CounterChannel channel, int minValue, int maxValue)
{
ClearReadBuffer();
SendCheckedCommand(string.Format("M1005 {0} {1} {2}", (int)channel, minValue, maxValue));
var data = ReadResponse();
var final = ReadResponse();
if (final != "ok")
throw new CounterException("Recieved unexpected response: " + final);
try
{
return data.Split(' ')
.Where(s => !string.IsNullOrEmpty(s))
.Select(s => ushort.Parse(s))
.ToArray();
}
catch (Exception e)
{
throw new CounterException("Recieved unexpected data: " + data + "\n\n" + e.Message);
}
}
