private void ProcessInputData(IReadOnlyList <INidaqMetric> listeningPorts, NILoop.HandleInfo taskInfo, IntPtr buffer, int sample_size_bytes, int hPoll)
{
var result = NILoop.read_buffer(hPoll, taskInfo.handle, buffer, sample_size_bytes * (taskInfo.samples_per_chan * listeningPorts.Count));
switch (result)
{
case 3:
case 1:
// task not found
SessionGraph.AsyncEmergencyStop(null);
_stopThread = true;
break;
case 2:
// queue empty, ignore
Thread.Sleep(1);
break;
case 0:
var channelData = buffer;
foreach (var port in listeningPorts)
{
((IMetricInput)port).DistributeData(channelData, taskInfo.samples_per_chan);
channelData = IntPtr.Add(channelData, sample_size_bytes * taskInfo.samples_per_chan);
}
break;
default:
// read error
System.Diagnostics.Debug.WriteLine(NidaQmxHelper.GetError(result));
SessionGraph.AsyncEmergencyStop(null);
_stopThread = true;
break;
}
}
public NidaqException(int code) : base(NidaQmxHelper.GetError(code))
{
}
private bool CreateVirtualChannel(InOutPortFlags flags)
{
// ------------------------------------
if (flags.HasFlag(InOutPortFlags.UseInput))
{
var inputs = _device.ListeningPorts.Where(port => port.Direction == ChannelDirection.Input)
.Select(port => port.Name);
if (inputs.Any())
{
var inputPortStrings = string.Join(",", inputs);
var result = NidaQmxHelper.DAQmxCreateAIVoltageChan(
maxVal: 10.0,
minVal: -10.0,
units: NidaQmxHelper.DaQmxValVolts,
terminalConfig: NidaQmxHelper.DaQmxValRse,
physicalChannel: inputPortStrings,
taskHandle: _device.InputTaskHandle,
nameToAssignToChannel: "chanI" + _device.Name,
customScaleName: null
);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
}
}
// ------------------------------------
if (flags.HasFlag(InOutPortFlags.UseOutput))
{
var outputs = _device.ListeningPorts.Where(port => port.Direction == ChannelDirection.Output)
.Select(port => port.Name);
if (outputs.Any())
{
var outputPortStrings = string.Join(",", outputs);
var channelNumber = 0;
foreach (var output in _device.ListeningPorts.Where(port => port.Direction == ChannelDirection.Output))
{
((NidaQmxChannelOutput)output).ChannelNumber = channelNumber++;
}
var result = NidaQmxHelper.DAQmxCreateAOVoltageChan(
maxVal: 10.0,
minVal: -10.0,
units: NidaQmxHelper.DaQmxValVolts,
physicalChannel: outputPortStrings,
taskHandle: _device.OutputTaskHandle,
nameToAssignToChannel: "chanO" + _device.Name,
customScaleName: null
);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.OutputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
}
}
// ------------------------------------
return(true);
}