Simulink Custom Library of S-Functions

Hi all,

I am looking to create a simulink custom library, with s-functions in it, however am a little confused by the process.

I understand normally you may make a library .slx and cut subsystems into it to create your library, then link this to the normal Library Browser to use elsewhere. However with s-functions, as these are support by additional code, I am unclear how this is meant to work without breaking links to supported file(s).

Has anyhow done this before and have a process for linking?

For some context, I am making a library for Arduino hardware with the aim to have a folder structure that has the library at the top level with subfolders containing each block .slx model with supported .c/.cpp/.h and build files to support the s-functions, such as below.

Thanks in advance!

Answer 1

[Fangjun Jiang]

Usually, to make a S-function work, you need to compile the source code into a .dll file or .mex file using mex().

So for a customized library with 10 S-Function blocks, I would make it a single .slx file containing the 10 blocks and provide the 10 .dll files. The files can be anywhere as long as they are in the path.

[SRance]

Would there happen to be a tutorial on that process? I am likely to need to work through it step-by-step.

At the moment I am assuming I build all the S-Functions in the Library so that I have all the .mex files with the library .slx, though recognise I'll end up with a mass of files.

Currently I've just made the Simulink S-Functions through building in Simulink then altering the .c wrapper; extern "C" before all the void functions and changing to .cpp. This has then been compiled onto my Arduino and tested, and am happy with the functionality - obviously now wanting to link those into a library.

Output wise (as in the screenshots below) I can see the .mexw64, though not really sure what to do with it to then build the library.

[Fangjun Jiang]

See S-Function examples. Build one first.

web(fullfile(docroot, 'simulink/sfg/s-function-examples.html'))