how to input Matlab "Bus Objects" in to "Level-2 MATLAB S-Functions"

Question

is it possible to use bus datatypes for m-file s-function blocks in Simulink?

I haven't found any examples for this in the matlab documentation or anywhere online.

For s-Functions written in C the API looks somewhat like this

  DTypeId dataTypeIdReg;
  ssRegisterTypeFromNamedObject(S, "myBusObject", &dataTypeIdReg);
  if(dataTypeIdReg == INVALID_DTYPE_ID) return;
  ssSetInputPortDataType(S,0, dataTypeIdReg);

now I'd like to access the same data type (a structure in C, a bus object in Matlab) from within my *.m source code. Do you know of any example or tutorial about this? As you might notice I'm not too familiar with the Simulink environment...

I also found different information on whether this is even possible

Q: do level 2 s-functions support bus objects?

• Answer 1 "yes, all data types are supported": http://nl.mathworks.com/help/simulink/sfg/s-function-features.html
• Answer 2 "no, bus objects are not supported": http://nl.mathworks.com/help/simulink/sfg/s-function-limitations.html

Answer 1

Actually, if you scroll down the page on your "answer 1", you'll see a line:

So both pages are in agreement: you can't use bus objects with MATLAB S-Functions. If you want to use bus objects with S-functions, it has to be a C-Mex S-function.

For some examples, see this blog post or this MATLAB Answer, or even this one.