private void CounterCallBack(IAsyncResult result)
{
// read the latest data from the counter
Int32[] data;
if (!Environs.Debug)
{
data = counterReader.EndReadMultiSampleInt32(result);
}
else
{
Random r = new Random();
data = new Int32[SAMPLE_MULTI_READ];
for (int i = 0; i < SAMPLE_MULTI_READ; i++)
{
data[i] = fakeCounterValue;
fakeCounterValue += (Int32)((oscillatorFrequency / SAMPLE_CLOCK_RATE) *
(1 + (FAKE_DATA_SPREAD * (r.NextDouble() - 0.5)) +
(FAKE_DATA_MOD *
Math.Sin(((sampleCounter * SAMPLE_MULTI_READ) + i) / FAKE_DATA_PERIOD))));
}
}
// start the counter reading again right away
if (!Environs.Debug)
{
counterReader.BeginReadMultiSampleInt32(
SAMPLE_MULTI_READ,
new AsyncCallback(CounterCallBack),
null
);
}
// deal with the data
StoreData(data);
if (lockOscillator && (sampleCounter % LOCK_UPDATE_EVERY == 0))
{
UpdateLock();
}
// update the gui ?
if (sampleCounter % GUI_UPDATE_EVERY == 0)
{
UpdateGUI();
}
sampleCounter++;
}
// 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 CounterReader(counterTask.Stream);
counterReader.SynchronizeCallbacks = true;
if (!Environs.Debug)
{
counterReader.BeginReadMultiSampleInt32(
SAMPLE_MULTI_READ,
new AsyncCallback(CounterCallBack),
null
);
}
}
// 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 CounterReader(counterTask.Stream);
counterReader.SynchronizeCallbacks = true;
if (!Environs.Debug)
counterReader.BeginReadMultiSampleInt32(
SAMPLE_MULTI_READ,
new AsyncCallback(CounterCallBack),
null
);
}