private bool CreateTaskHandle()
{
int[] taskHandle = new int[1];
var result = NidaQmxHelper.DAQmxCreateTask(null, taskHandle);
if (result < 0)
{
OnError?.Invoke(this, new DeviceErrorArgs("Could not create input nidaq task"));
return(false);
}
InputTaskHandle = taskHandle[0];
result = NidaQmxHelper.DAQmxCreateTask(null, taskHandle);
if (result < 0)
{
OnError?.Invoke(this, new DeviceErrorArgs("Could not create output nidaq task"));
return(false);
}
OutputTaskHandle = taskHandle[0];
return(true);
}
/// <summary>
/// Creates a new DAQmx task and adds channels to it
/// </summary>
/// <param name="nodes">Graph nodes of type MetricAnalogInput</param>
/// <exception cref="InvalidCastException">At least one element in <paramref name="nodes"/> not of type MetricAnalogInput</exception>
/// <exception cref="InvalidOperationException">At least one element in <paramref name="nodes"/> not connected to the instance's specified device or task already created</exception>
/// <exception cref="NidaqException">Task or channel could not be created</exception>
public void CreateTask(IEnumerable <INidaqMetric> nodes)
{
if (TaskHandle != 0)
{
throw new InvalidOperationException("Task already created. First destroy the old task");
}
if (!nodes.All(n => n is MetricAnalogInput))
{
throw new InvalidCastException("all passed nodes must be of type MetricAnalogInput");
}
if (!nodes.All(n => n.Channel.Device == Device))
{
throw new InvalidOperationException("not all passed nodes are connected to device " + Device.Name);
}
foreach (var node in nodes.OfType <MetricAnalogInput>())
{
node.Samplerate = ClockRate;
}
// 1. create task
var taskHandle = new int[1];
var result = NidaQmxHelper.DAQmxCreateTask(null, taskHandle);
if (result < 0)
{
throw new NidaqException(result);
}
TaskHandle = taskHandle[0];
// 2. create channels
foreach (var input in nodes.OfType <MetricAnalogInput>())
{
result = NidaQmxHelper.DAQmxCreateAIVoltageChan(
maxVal: input.VMax,
minVal: input.VMin,
units: NidaQmxHelper.DaQmxValVolts,
terminalConfig: (int)input.TerminalConfig,
physicalChannel: input.Channel.Path,
taskHandle: TaskHandle,
nameToAssignToChannel: null,
customScaleName: null
);
if (result < 0)
{
CleanupAndThrow(result);
}
_nodes.Add(input);
}
// 3. configure clock
SamplesPerChannel = ClockRate / 5;
result = NidaQmxHelper.DAQmxCfgSampClkTiming(
activeEdge: NidaQmxHelper.DaQmxValRising,
sampleMode: NidaQmxHelper.DaQmxValContSamps,
sampsPerChan: (ulong)SamplesPerChannel,
taskHandle: TaskHandle,
source: "",
rate: ClockRate
);
if (result < 0)
{
CleanupAndThrow(result);
}
State = SessionTaskState.Stopped;
}
public void CreateTask(IEnumerable <INidaqMetric> nodes)
{
if (TaskHandle != 0)
{
throw new InvalidOperationException("Task already created. First destroy the old task or task already created");
}
if (!nodes.All(n => n is MetricDigitalInput))
{
throw new InvalidCastException("all passed nodes must be of type MetricDigitalInput");
}
if (!nodes.All(n => n.Channel.Device == Device))
{
throw new InvalidOperationException("not all passed nodes are connected to device " + Device.Name);
}
// 1. create task
if (Source == ClockSource.Intern)
{
_counter = new NidaqCounterOutput(Device.Name + "/ctr0", ClockRate);
}
var taskHandle = new int[1];
var result = NidaQmxHelper.DAQmxCreateTask(null, taskHandle);
if (result < 0)
{
throw new NidaqException(result);
}
TaskHandle = taskHandle[0];
// 2. create channels
foreach (var input in nodes.OfType <MetricDigitalInput>())
{
result = NidaQmxHelper.DAQmxCreateDIChan(
lines: input.Channel.Path,
taskHandle: TaskHandle,
lineGrouping: NidaQmxHelper.DAQmx_Val_ChanForAllLines,
nameToAssignToChannel: null
);
if (result < 0)
{
CleanupAndThrow(result);
}
_nodes.Add(input);
}
// 3. configure clock
SamplesPerChannel = ClockRate / 10;
result = NidaQmxHelper.DAQmxCfgSampClkTiming(
activeEdge: NidaQmxHelper.DaQmxValRising,
sampleMode: NidaQmxHelper.DaQmxValContSamps,
sampsPerChan: (ulong)SamplesPerChannel,
taskHandle: TaskHandle,
source: (this.Source == ClockSource.Intern) ? ("/" + Device.Name + "/Ctr0InternalOutput") : ClockPath,
rate: ClockRate
);
if (result < 0)
{
CleanupAndThrow(result);
}
State = SessionTaskState.Stopped;
}