Giving commands parallel to the A-D converter (National Instruments) and the axes (PI).

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Moritz Meschkat 2019-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/490587-giving-commands-parallel-to-the-a-d-converter-national-instruments-and-the-axes-pi

评论： Walter Roberson 2019-11-12

Is there a possibility, to send commands simultaneous to this two connected devices?

I am using a GUI. If I push the first checkbox, this code will run:

while(get(hObject,'Value'))

set(handles.X_POS,'String',num2str( eval(sprintf('%.4f',handles.Controller1.qPOS('1'))) )); %%request for the exact position of axis

pause(0.1);

end

and if I push the second box, that code starts:

while(get(hObject,'Value'))

[data,time] = handles.s.startForeground; %%request for voltage-datas of the last second (A-D converter)

pause(0.1);

end

If I push both checkboxes, one code stops directly.

So I would like to run it simulataneous.

Thank you in advance.

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Walter Roberson 2019-11-12

eval() is single threaded only. You should probably use the round() function instead.

Walter Roberson 2019-11-12

Are the controllers both connected to the same device, or are they connect to different devices? And do you have access to the Parallel Computing Toolbox?

If they are connected to different device and you do have the Parallel Computing Toolbox then you can do what you are talking about, run the code simulatenously. It won't be the best of ideas, but it is possible, and sometimes people are unwilling to accept other solutions that do not involve the code running literally simultaneously.

Better would be to use timer function callbacks. You might only need one callback, especially if you switch to background operations instead of foreground operations.

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