Exchanging data from data acquisition listener to GUI

Question

Rajeev Yadav 2014-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/123914-exchanging-data-from-data-acquisition-listener-to-gui

评论： Rajeev Yadav 2014-4-1

I am trying to create a buffer to store data between each listener call (when data is available)via a GUI. Could you give some idea as to how to achieve it?

I tried global variables, storing the data in handles but it doesn't work.

Thanks RY

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Answer 1

Joseph Cheng 2014-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/123914-exchanging-data-from-data-acquisition-listener-to-gui#answer_131545

在 MATLAB Online 中打开

When you try to store the data in handles did you update the handles object with:

guidata(hObject, handles);

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Rajeev Yadav 2014-4-1

Thanks Joe, I understand your point. The problem is not that simple. I am already invoking the DAQ session via a button event. The DAQ allows to call a listener when a set number of samples are available for processing. I can use the listener to plot and store to file. The code snippet is as below:

lh = s.addlistener('DataAvailable', @(src, event) plotData(src, event, fidData, handles));

s.NotifyWhenDataAvailableExceeds = str2double(get(handles.tNumSample, 'string'));

s.startBackground();

My problem is to access data from one listner call to another.

Thanks RY

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