Generating a DLL shared library from a Simulink model with an S-function

I'm trying to generate a DLL from a Simulink fixed wing autopilot model which contains an S function written in Matlab. I follow the standard procedure using Embedded Coder but I end up with the following error:

For code generation, S-function parameters must be one or two dimensional nonsparse numeric or character arrays unless the S-function uses a TLC file and has an mdlRTW function.

Any leads to fix this issue would be great.

Thanks in advance.

Answer 1

[Aniket]

Hi @Vighnesh,

When generating code for a Simulink model that includes an S-function, you may encounter the error indicating that the S-function parameters must be one or two-dimensional nonsparse numeric or character arrays.

This might happen because of these possible scenarios:

1. Passing a 3D or higher dimensional array: 3D inputs are supported for the S-function but not natively supported for code generation. A TLC file is needed to handle complex data types.

2. S-functions that call into MATLAB are not supported for code generation.

Refer to this link to know more about S-function Code Generation capabilities:

https://www.mathworks.com/help/rtw/ug/s-functions-and-code-generation.html

Please follow these possible workarounds to resolve the issue:

1. Define your own code generation using the C function/Target Language Compiler (TLC) file & “mdlRTW” function.

Please find its documentation in the link below:

https://www.mathworks.com/help/simulink/sfg/mdlrtw.html

2. If the purpose of using S-function is to protect your intellectual property, instead of generating an S-Function you can try creating a protected model.

I hope this helps resolve the issue!