How can enumerations be included in an s-function?

I am trying to convert a Simulink/ stateflow model to a black box. Using Matlab 2015a, right clicking on the subsystem - C/C++ code - Generate s-function will do the job but with one issue. I have some datatypes defined as enumeration via an m-file in the current folder. Is there an option to include these in the s-function so I dont need those enum m-files to run the s-function?

Thanks,

Martin

Answer 1

[Varun Bhaskar]

Hello,

You can use enumerated data type in C-MEX S-Function by defining same data type with MATLAB and S-Function.

To use enumerated data type in S-Function, you need to use ssRegisterTypeFromNamedObject method to resister the data type from MATLAB/Simulink into S-Function. Sample files can be downloaded below. To execute the model, execute following command first, and then simulate the model.

>>mex enumExample.c

In this case, we use the OnOff.m enumerated data type class for the registration. More on this S-function method can be found here:

http://www.mathworks.com/help/simulink/sfg/ssregistertypefromnamedobject.html

More on creating these custom data types in MATLAB can be found here:

http://www.mathworks.com/help/simulink/ug/enumerated-types-supported-in-matlab-function-blocks.html

After the type is registered, you can use the "ssSetInputPortDataType" method to set the type accordingly:

if (ssGetSimMode(S) != SS_SIMMODE_SIZES_CALL_ONLY) {
DTypeId dataTypeIdReg;
ssRegisterTypeFromNamedObject(S, "OnOff", &dataTypeIdReg);
if (dataTypeIdReg == INVALID_DTYPE_ID)
return;
ssSetInputPortDataType(S, 0, dataTypeIdReg);
}

See example enumExample.c attached to know more about using enumerate data type in C-MEX S-Function.

[Martin]

Hi Varun,

Thank you for your detailed response. Sorry, I am having trouble understanding the example. Also, I was not precise enough in my problem description. Maybe the following example will help.

The question is how do I convert the stateflow chart from 'enumModelExample1.slx' to an s-function in 'enumModelExample2.slx' which does not need the file for the output enum 'Status.m'.

Thanks in advance,

Martin