Writing S-Functions

Templates for C S-Functions

Simulink provides skeleton implementations of C MEX S-functions, called templates, intended to serve as starting points for creating your own S-functions. The templates contain skeleton implementations of callback methods with comments that explain their use. The template file, sfuntmpl_basic.c, which can be found in the directory simulink/src below the MATLAB root directory, contains commonly used S-function routines. A template containing all available routines (as well as more comments) can be found in sfuntmpl_doc.c in the same directory.

Note    We recommend that you use the C MEX-file template when developing MEX S-functions.

Example of a Basic C MEX S-Function

S-Function Source File Requirements