MATLAB: Is it possible to use the function EML.CSTRUCTNAME with Simulink Bus objects

simulink

I have a model that contains an Embedded MATLAB Function block with the following code

function y = foo()
% This block supports the Embedded MATLAB subset.
% See the help menu for details. 
a.one = int32(10);
a.two = 5;
eml.cstructname(a,'myBus');
y = a;

I would like the output signal to be a Simulink bus object.

Best Answer

It is possible to use Simulink bus objects as output signal types from Embedded MATLAB function blocks that use the EML.CSTRUCTNAME function. To do so the the structure that is named in the CSTRUCTNAME function must match the bus object exactly.

For the example given above a bus object must be defined in the workspace with the name 'myBus' and have the fields 'one' with a data type of int32 and 'two' with a data type double.

Once the bus is defined you can open the model explorer and click on the Embedded MATLAB Function icon in the Model Hierarchy window. Then, specify the output variable's data type to be 'Bus: myBus'.

For more information on creating bus objects see the documentation section titled 'Using the Bus Editor'. You can also execute to following in a MATLAB (2008a) command window:

web([docroot '/toolbox/simulink/ug/brin2jr-1.html'])

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MATLAB: Can i check the signals in a Bus

One approach would be to create a bus object from the bus creator in your model that creates the bus using the function Simulink.Bus.createObject. You could then write a MATLAB function that looks to see if any of the bus elements match your specific signal name/type/size.

MATLAB: How can i create bus elements of one bus object from code in simulink

In matlab code, create a generic element using

 myElement = Simulink.BusElement;

You can set the properties of the new element by directly accessing the values. For example

 myElement.Name = 'mySignal';
 myElement.DataType = 'uint8';

Once you are finished with the element, you can add it to the bus:

 myBus = Simulink.Bus; % You only need to do this once when you create the bus object
 myBus.Elements(end+1) = myElement; % Add the element to the bus

Another way to create bus objects is to implement the bus in simulink with all its inputs with correct data types and sizes. For example like this:

Select the bus creator block and run the following code:

 Simulink.Bus.createObject(gcs, gcb);

This will put a bus object named like the output signal of the bus creator, in this case myBus, in the workspace.

Best Answer

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