How do I generate a continuous signal and acquire data over short spans simultaneously? (New to DAQ Toolbox)

As the subject says, I am completely new to using the Data Acquisition Toolbox, and I am writing a program to calibrate a piece of equipment by incrementing the continuous output voltage by .25V every iteration, taking input measurements for 2 seconds, and averaging the values to make a single data point for the single output setting. I am using an NI USB-6211, and here is the code:

close all; clear all; clc;

s1 = daq.createSession('ni');
s2 = daq.createSession('ni');
s1.addAnalogInputChannel('Dev1',0,'Voltage');
s1.addAnalogInputChannel('Dev1',1,'Voltage');
s1.addAnalogInputChannel('Dev1',2,'Voltage');
s2.addAnalogOutputChannel('Dev1',0,'Voltage');

s1.Rate = 1000; % (should be default)
s2.Rate = 1000;
s1.DurationInSeconds = 2;
s2.IsContinuous = true;

outputValue = zeros(500,1);

for i = 0:0.25:5
    disp(['Output ',num2str(i),'V to MFCs.']);
    outputValue(:) = i;
    lh = s2.addlistener('DataAvailable', ...
    @(src,event) src.queueOutputData(outputValue));
    s2.queueOutputData(outputValue);
    s2.startBackground();

      disp(['Acquiring data at ',num2str(i),'V setting for 2 seconds.']);

      [capturedData,time] = s1.startForeground();
      disp('Finished acquiring');

      v0Avg = mean(capturedData(:,1))
      v1Avg = mean(capturedData(:,2))
      V2Avg = mean(capturedDate(:,3))

      s2.stop();
      s1.stop();
      delete(lh);
  end

It seems to get hung up at the "[capturedData,time] = s1.startForeground();" line, and I have no clue right now as to why that would be.

Also, if you see that I am doing anything silly or nonsensical, feel free to shed some knowledge.

Thank you for your help

[Brian Marker]

Sorry for the weird formatting in the code. I'm not sure why it did that.

close all; clear all; clc;

s1 = daq.createSession('ni');

s2 = daq.createSession('ni');

s1.addAnalogInputChannel('Dev1',0,'Voltage');

s1.addAnalogInputChannel('Dev1',1,'Voltage');

s1.addAnalogInputChannel('Dev1',2,'Voltage');

s2.addAnalogOutputChannel('Dev1',0,'Voltage');

s1.Rate = 1000;

s2.Rate = 1000;

s1.DurationInSeconds = 2;

s2.IsContinuous = true;

outputValue = zeros(500,1);

for i = 0:0.25:5

      disp(['Output ',num2str(i),'V to MFCs.']);
      outputValue(:) = i;
      lh = s2.addlistener('DataAvailable', ...
      @(src,event) src.queueOutputData(outputValue));
      s2.queueOutputData(outputValue);
      s2.startBackground();

      disp(['Acquiring data at ',num2str(i),'V setting for 2 seconds.']);

      [capturedData,time] = s1.startForeground();
      disp('Finished acquiring');

      laserAvg = mean(capturedData(:,1))
      sensorAvg = mean(capturedData(:,2))
      outputAvg = mean(capturedDate(:,3))

      s2.stop();
      s1.stop();
      delete(lh);
  end

Answer 1

[BienLe]

Hi, I encountered the same problem. Could you please help me to solve the problem? My Matlab always hung up whenever I use "Iscontinuous = true".

Thanks a lot.

Bien