How do I replace the step command for running an object in MATLAB2018a

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Branko Celler
Branko Celler 2018-6-9
回答： Branko Celler 2018-6-10
In the following code;
DataRecorder = dspdemo.DAQRecorder(...
'DeviceName', deviceName,...
'SamplesPerFrame', samplesPerFrame,...
'SampleRate', sampleRate,...
'ChannelNumbers', 0,...
'OutputNumOverrunSamples', true);
%%Acquire data continuously
% Acquire data through a simple while loop, until the time reaches the
% value previously defined in endTime.
% To terminate the acquisition manually press CTRL+C
tstart = tic;
while (toc(tstart) < endTime)
% Use step method to acquire SamplesPerFrame at a time from the device
[data, numov] = step(DataRecorder);
if(~isempty(data))
plot(data), set(gca,'Xlim',[0, length(data)-1])
drawnow
end
if(numov > 0)
fprintf('Samples overrun: %g\n',numov)
end
end
In the above code the specific command;
[data, numov] = step(DataRecorder);
does not work in Matlab 2018a
How can I run that object in the same manner using Matlab2018a
I don't understand how objects work!
Thank you

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回答（3 个）

Branko Celler
Branko Celler 2018-6-10
Are you saying, replace command [data, numov] = step(DataRecorder); with [data, numov] = step();
That generates an error Error in DaqBasicAnalogInExample (line 61) [data, numov] = step();
and runs a demo of the step function!
  1 个评论
Walter Roberson
Walter Roberson 2018-6-10
No. You told us that that specific command does not work in MATLAB R2018a, but you did not tell us how you know that it does not work. Does it produce an error message? Does it accept the command but nothing happens?

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Branko Celler
Branko Celler 2018-6-10
编辑：Walter Roberson 2018-6-10
The code comes from the following:
https://au.mathworks.com/matlabcentral/fileexchange/46685-live-data-acquisition-for-real-time-signal-processing-in-matlab
When I run the program at a much slower sampling rate (500samples/sec), the program runs and ultimately shows a plot after it completes, but generates the following warning;
>> DaqBasicAnalogInExample
Warning: DesiredTerminalConfiguration specified not supported
> In dspdemo.private.DeviceManager/constructSessionDevice
In dspdemo.private.DeviceManager/constructDevice
In dspdemo.DAQRecorder/setupImpl
In DaqBasicAnalogInExample (line 60)
line 60 is the command;
[data, numov] = step(DataRecorder);
I hope that this is a little clearer!
Regards
Branko
Branko Celler
Branko Celler 2018-6-10
Thank you for your efforts. However for some strange reason it is now working. I still get the warnings, but I am collecting and displaying data It may have had something to do with my setting up of the NI device

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