private bool RunTask(InOutPortFlags flags)
{
if (flags.HasFlag(InOutPortFlags.UseInput))
{
var result = NidaQmxHelper.DAQmxStartTask(_device.InputTaskHandle);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
}
//if (flags.HasFlag(InOutPortFlags.UseOutput)) {
// var result = NidaQmxHelper.DAQmxStartTask(_device.OutputTaskHandle);
// if (result < 0) {
// NidaQmxHelper.DAQmxStopTask(_device.InputTaskHandle);
// NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
// NidaQmxHelper.DAQmxClearTask(_device.OutputTaskHandle);
// _device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
// return false;
// }
//}
return(true);
}
public bool Start(NidaQmxDevice2 device)
{
if (Recording)
{
return(false);
}
_device = device;
InOutPortFlags flags = 0;
if (device.ListeningPorts.Any(p => p.Direction == ChannelDirection.Input))
{
flags |= InOutPortFlags.UseInput;
}
if (device.ListeningPorts.Any(p => p.Direction == ChannelDirection.Output))
{
flags |= InOutPortFlags.UseOutput;
}
if (!CreateVirtualChannel(flags))
{
return(false);
}
if (!ConfigureDevClock(flags))
{
return(false);
}
if (flags.HasFlag(InOutPortFlags.UseInput))
{
Data = Marshal.AllocHGlobal(sizeof(double) * device.SamplesPerChannelInput * device.ListeningPorts.Count());
foreach (var port in device.ListeningPorts.OfType <NidaQmxChannelInput>())
{
port.SetBufferSize(device.SamplesPerChannelInput);
}
}
if (!RunTask(flags))
{
return(false);
}
_stopThread = false;
if (flags.HasFlag(InOutPortFlags.UseInput))
{
_pollThread = new Thread(EveryNCallback);
_pollThread.Start();
}
Recording = true;
return(true);
}
private bool ConfigureDevClock(InOutPortFlags flags)
{
if (flags.HasFlag(InOutPortFlags.UseInput))
{
var result = NidaQmxHelper.DAQmxCfgSampClkTiming(
activeEdge: NidaQmxHelper.DaQmxValRising,
sampleMode: NidaQmxHelper.DaQmxValContSamps,
sampsPerChan: (ulong)_device.SamplesPerChannelInput,
taskHandle: _device.InputTaskHandle,
source: "",
rate: _device.SamplerateInput
);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
}
if (flags.HasFlag(InOutPortFlags.UseOutput))
{
var result = NidaQmxHelper.DAQmxCfgSampClkTiming(
activeEdge: NidaQmxHelper.DaQmxValRising,
sampleMode: NidaQmxHelper.DaQmxValContSamps,
sampsPerChan: (ulong)_device.SamplesPerChannelOutput,
taskHandle: _device.OutputTaskHandle,
source: "",
rate: _device.SamplerateOutput
);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
NidaQmxHelper.DAQmxClearTask(_device.OutputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
result = NidaQmxHelper.DAQmxCfgOutputBuffer(_device.OutputTaskHandle, _device.SamplesPerChannelOutput);
if (result < 0)
{
NidaQmxHelper.DAQmxClearTask(_device.InputTaskHandle);
NidaQmxHelper.DAQmxClearTask(_device.OutputTaskHandle);
_device.ReportError(new DeviceErrorArgs(NidaQmxHelper.GetError(result)));
return(false);
}
}
return(true);
}
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);
}
