Generate Continuous Analog Output Using NI Card
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Eddy H
on 15 Jan 2016
Commented: Walter Roberson
on 15 Jan 2016
Hello,
I am trying to generate continuous analog output using an NI card (NI USB-6343). The frequency of the analog output will be updated based on an algorithm and other input data. However, I am struggling with a more basic step and for now, I would just like to generate a continuous voltage signal using data called from a function (queueMoreData.m). My code:
daq.reset
daq.HardwareInfo.getInstance('DisableReferenceClockSynchronization',true); % This is to overcome a different issue
d = daq.getDevices;
s = daq.createSession('ni');
ch = addAnalogOutputChannel(s,'Dev1','ao0','Voltage');
lh = addlistener(s, 'DataRequired', @queueMoreData);
s.IsContinuous = true;
queueOutputData(s,linspace(-1, 1, 1000)');
startBackground(s);
Which calls the function queueMoreData.m
function queueMoreData(src,event)
queueOutputData(s, linspace(-1, 1, 1000)');
end
This is based on this tutorial: http://uk.mathworks.com/help/daq/generate-analog-output-signals.html#btxscoj-1
But I get the following error:
_Warning: Error occurred while executing callback: Undefined function or variable 's'.
Error in queueMoreData (line 3) queueOutputData(s,linspace(-1, 1, 1000)');
Error in daq.internal.BaseClass/notify (line 91) obj.notify@handle(varargin{:});_
Etc Etc Etc
Any help would be very much appreciated!
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Accepted Answer
Walter Roberson
on 15 Jan 2016
In your callback change the reference from s to src
2 Comments
Walter Roberson
on 15 Jan 2016
If you go to the bottom right of the documentation page and click on the button to say that it did not help you then you can describe the mistake and the report will be sent to an appropriate person.
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