how to define the output of a system object as a bus element in simulink?

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dale finney
dale finney 2024-4-11
评论： Manikanta Aditya 2024-4-17
I am using matlab system objects (SysOb) in simulink. I want to have the outputs assigned to a bus element. I can do this with a Subsystem and want the same behaviour for a SysOb. I tried creating an output struct for the SysOb but when I connect this output to a bus selector there are no signals (fields?) to pick. I assume that the SysOb should be at least as good as a Subsystem.
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dale finney
dale finney 2024-4-11
did you just google my question? if so, not helpful
I read item 1 and did not find anything specific to my problem
I had already tried item 2 but it doesn't work for me. This works when one assigns signals to a bus creator and then to an output bus element inside a subsystem. As I mentioned in my original question, subsystems are not a problem.

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回答（2 个）

Mark McBroom
Mark McBroom 2024-4-16
  1. create a Simulink Bus with the same layout as the MATLAB structure you are creating in your system object.
  2. Set the type of the system object output to be this simulink bus using the getOutputDataTypeImpl() method:
https://www.mathworks.com/help/matlab/ref/matlab.system.getoutputdatatypeimpl.html
dale finney
dale finney 2024-4-16
thanks for your reply.
For Item 2 I have the something like following but with many more fields:
function out = getOutputDataTypeImpl(obj)
[out.A, out.B, out.C, out.D] = deal("logical");
end
For item 1, I still don't understand. I have to 'layout' the bus selector before I use it? normally simulink will populate the list of available signals in the bus. Is it different?

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