MATLAB: A good way to publish simulink values to GUI from a running model

guiguidesimulationsimulink

I currently can affect a running model from my GUI, both start/pause/stop and update values that are inputs to the current model. I do this via workspace variables to constant blocks using set_param(…'update').

Now I need to show values from my running model in my GUI but I'm not sure of how I would do that? My plan was to use a 1 second timer and then read out signal values but I'm not sure of how to do that. Please let me know if you have a good way!!

Any thoughts are appreciated, thanks! //bjoern

Best Answer

This is a good approach.

However with just that, your GUI will need a mechanism to poke at the model to get the data.

I would combine that with an event listener:

http://www.mathworks.com/help/toolbox/simulink/slref/add_exec_event_listener.html

That way, the event listener can send the data from the runtime object to your GUI automatically every time the block output value is updated.

Related Solutions

MATLAB: How to update a GUI with values from the Simulink model as it is running

There is no direct way to access the runtime parameters of a Simulink model from a MATLAB GUI. To work around this issue, you need to create a function that will update the GUI with the desired model data at each time step. An outline of this procedure is as follows.

1. Create a GUI with a control that you would like to update with information from the model. In this example, we would like to see the output of the model's Gain block in the GUIs edit text window.

2. Create a model callback function that will register an event listener for the block in question. This function will be called every time the block is updated. We will use it to access the value of the Gain blocks output and pass them to the GUI. In this case we will use the models 'StartFcn' callback.

%The GUI handles are by default hidden, turn them on
set(0,'ShowHiddenHandles','on');
%Set up the arguments that will go into the gain block event callback listener
blk = 'mytestmdl/Gain';
event = 'PostOutputs';
listener = @updategui;
%Create the listener
h = add_exec_event_listener(blk, event, listener);

3. Create a MATLAB file function that will get the Gain block's runtime output parameter and pass it to the GUI.

function varargout = updategui(varargin)
%create a run time object that can return the value of the gain block's
%output and then put the value in a string.  
rto = get_param('mytestmdl/Gain','RuntimeObject');
str = num2str(rto.OutputPort(1).Data);
%get a handle to the GUI's 'current state' window
statestxt = findobj('Tag','curState');
%update the gui
set(statestxt,'string',str);

MATLAB: Is there a better way to do the following undocumented thing

I think I figured it out. It can all be condensed to

    LimListener = addlistener(imAxes,{'XLim','YLim'},'PostSet',@localLimitListener);

Best Answer

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MATLAB: How to update a GUI with values from the Simulink model as it is running

MATLAB: Is there a better way to do the following undocumented thing

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