Simulink Real-Time 2020b. How do I monitor/log a signal in my application using App Designer?

Hi,

I am trying to monitor a signal in my real-time application on Speedgoat using App Designer. I am trying to recreate a similar function to the one included in slrtExplorer but so far I have been unsuccessful. I am not able to use the suggested fucntions such as ConnectScalar, getCallbackDataForSignal and so on.

Does anyone know how to do it? Is there an example that is not the invertedPendulum that I can use as a reference?.

Thanks for the help!

[Hamidreza Kolbari]

Hi,

I am working an a project.

I am using below two different functions

function createInstrumentation(app)

% Create a new instrument object that will be linked to the application

app.Instrument = slrealtime.Instrument;

% Connect callback to signal

addSignal(app.Instrument, [app.modelName,'/ControlValue'], 1)

addSignal(app.Instrument, [app.modelName,'/Gain2'], 1)

connectCallback(app.Instrument, @app.instrumentCallback);

end

function instrumentCallback(app, instObj, eventData)

if ~isempty(eventData.AcquireGroupData.Time)

[~, ctrlValue] = instObj.getCallbackDataForSignal(eventData, [app.modelName,'/ControlValue:1']);

[~, valveValue] = instObj.getCallbackDataForSignal(eventData, [app.modelName,'/Gain2:1']);

end

end

pushed button>>>>>>>>>>>\

createInstrumentation(app)

but it is not working. do you know what the problem is?

Answer 1

[Diego Kuratli]

In R2021b, the code required for binding signals and parameters have been reduced. There is a simple example in the documentation:

https://www.mathworks.com/help/slrealtime/ug/basic-app-designer-app-for-real-time-app-interface.html

If possible, I would recommend to move to R2021b.

For R2020b, this video might help:

https://www.mathworks.com/videos/user-interfaces-for-simulink-real-time-1599738400687.html

[Matteo Pellegri]

Hi Diego, thanks for the reply.

I am aware of the improvement of 2021b but for now I am not able to move to 2021b.

I watched that video already and the problem is that connectScalar/connectLine are usfeul if you are monitoring a small amount of variables and it seems that I am not able to use the data I am logging with those functions. Furthermore adding programmatically the components and linking them seems way too complex for what I am trying to achieve.

The current workaround I implementes is the following

function setupInstrumentation(app)
    % create instrumentation object
    hInst = slrealtime.Instrument(mldatx);
     
    %% Add signals and connections
    hInst.addSignal({'block/signalName'}, 1);
    
    %add callback
    app.hInst.connectCallback(@app.updateCallback);
end

function updateCallback(app,instObj,eventData)
    curr_time = eventData.AcquireGroupData.Time;
    
    if ~isempty(curr_time)
        aGData = eventData.AcquireGroupData.Data;
        [~,cv_data] = instObj.getCallbackDataForSignal(eventData,'block/signalName',1);
        app.edit.Value = double(cv_data(end)); %edit field (numeric) is not happy with anything but double
    else
        %do nothing
    end
end

% Button pushed function: LogMessagesButton
function StartLogMessage(app, event)
    selectedTargetName = app.getSelectedTargetName();
    tg = slrealtime(selectedTargetName);
    tg.removeAllInstruments;
    app.setupInstrumentation;
    % Clear previous data
    app.hInst.clearScalarAndLineData;
    
    % Validate and add instrumentation to target
    tg.addInstrument(app.hInst);
    
end

It seems to work. Do you see anything wrong with this?

Thanks again!

[Hamidreza Kolbari]

Hi,

I am working an a project.

I am using below two different functions

function createInstrumentation(app)

% Create a new instrument object that will be linked to the application

app.Instrument = slrealtime.Instrument;

% Connect callback to signal

addSignal(app.Instrument, [app.modelName,'/ControlValue'], 1)

addSignal(app.Instrument, [app.modelName,'/Gain2'], 1)

connectCallback(app.Instrument, @app.instrumentCallback);

end

function instrumentCallback(app, instObj, eventData)

if ~isempty(eventData.AcquireGroupData.Time)

[~, ctrlValue] = instObj.getCallbackDataForSignal(eventData, [app.modelName,'/ControlValue:1']);

[~, valveValue] = instObj.getCallbackDataForSignal(eventData, [app.modelName,'/Gain2:1']);

end

end

pushed button>>>>>>>>>>>\

createInstrumentation(app)

but it is not working. do you know what the problem is?