MATLAB: How to display the value of Display block in App Designer

app designerexport dataMATLABsimulink

I want to get the value displayed on Display block and display it on Edit control in App Designer.

Here's what i tried

using get_param

I thought I can get the displayed value but I couldn't find what parameter I should use.

2. get InputPort data

instead of finding around for a parameter having displayed value, I decided to use InputPort data.

I got RuntimeObject handle and printed InputPort data but it returned empty string.

but when I checked signal data on simulink screen, the signal wasn't empty.

so I tested String to ASCII block (see the code below)

My question is

Is there parameter I can use to do this?
Is it impossible to get string signal from simulink? If it's possible, please let me know how to do.

rto = get_param([String to ASCII block path], 'RuntimeObject');
rto.InputData(1).Data
ans = 
    ""
rto.OutputData(1).Data
ans =
    72 101 108 108 111 33

Best Answer

It was only quite recently that Simulink became able to have character signals. Your signal is probably not character.

Have look at

char(rto.OutputData(1).Data)

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MATLAB: How to use a timer to update real time data from Simulink

Marc - presumably it is the code in your pushbutton_read_Callback that you wish to call periodically. Try to do the following - in the _OpeningFcn of your GUI, you could create and start a timer as

 % Choose default command line output for ReadFromWorkspace
 handles.output = hObject;
 % create the timer object
 handles.timer = timer('Name','ReadFromSimulink',      ...
                       'Period',1,                     ... 
                       'StartDelay',1,                 ... 
                       'TasksToExecute',inf,           ... 
                       'ExecutionMode','fixedSpacing', ...
                       'TimerFcn',{@timerCallback,handles.figure1}); 
 % Update handles structure
 guidata(hObject, handles);
 % start the timer
 start(handles.timer);

In the above we create and start a timer that will fire every one second (period). The callback that fires is timerCallback and it takes one additional input parameter which is the handle to the GUI figure. Now we define the callback (in the GUI) as

 function timerCallback(~,~,hFigure)
 % get the handles to the controls
 handles = guidata(hFigure);
 % add the code from your pushbutton function

In the above, we use the guidata function to get the handles structure so that we can update any controls on the GUI with the data that we have read in from Simulink. Note that you may want to add some code to the DeleteFcn of your GUI to stop the running timer. Something like

 function yourGuiName_DeleteFcn(hObject, ~, handles)
 try
    stop(handles.timer);
    delete(handles.timer);
    handles.timer = [];
    guidata(hObject,handles);
 catch
    % intentionally left blank
 end

Try the above and see what happens!

Best Answer

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MATLAB: How to convert ascii numbers to character data type in simulink

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