我可以在visual studio中使用Measurement studio C#从usb端口(来自数据采集系统)获取数字信号并绘制它吗?我如何做到这一点??。我只是试着用它来绘制噪声信号,但我不能用它来从端口获取信号。
// Declare and initialize an instance of WhiteNoiseSignal.
WhiteNoiseSignal whiteNoise = new WhiteNoiseSignal();
// Store the generated data in a double array named data.
double[] data = whiteNoise.Generate(1000.0, 256);
// Use the PlotY method to plot the data.
plot.PlotY(data);
这是我使用的代码。
Liza,根据您拥有的设备,您需要配置数字或模拟输入通道。然后创建一个任务来监视您感兴趣的端口,并等待它在采集完成后回调。类似这样的东西:
public void CreateAnalogInputTask()
{
try
{
// create a new task
myAITask = new Task();
// create a new virtual channel
myAITask.AIChannels.CreateVoltageChannel("Dev1/ai0, "", AITerminalConfiguration.Differential, -10, 10, AIVoltageUnits.Volts);
// configure the timing
myAITask.Timing.ConfigureSampleClock("",
AISampleRate,
SampleClockActiveEdge.Rising,
SampleQuantityMode.ContinuousSamples,
numberOfAISamples);
myAITask.Stream.Buffer.InputBufferSize = 10000000;
// verify the task
myAITask.Control(TaskAction.Verify);
// create the analogReader object
analogInReader = new AnalogMultiChannelReader(myAITask.Stream);
analogInReader.SynchronizeCallbacks = false;
arAnalogInReader = analogInReader.BeginReadWaveform(numberOfAISamples, AnalogInputRead, myAITask);
}
catch (Exception ex)
{
log.Error("", ex);
if (myAITask != null)
myAITask.Dispose();
}
}
然后在调用此回调时读取数据:
public void AnalogInputRead(IAsyncResult ar)
{
try
{
try
{
myAIdata = analogInReader.EndReadWaveform(ar);
}
catch (DaqException ex)
{
if (ex.Error != 88710)
throw;
else
log.Debug("DaqException 88710 ignored", ex);
}
for (int i = 0; i < numberOfAISamples; i++)
{
myData[i] = myAIdata[0].Samples[i].Value;
}
}
catch (Exception ex)
{
log.Error("", ex);
}
}