The following diagram shows the basic structure of an S-function that directly handles fixed-point data types.
The callouts in the diagram alert you to the fact that you must include
fixedpoint.c at the
appropriate places in the S-function. The other elements of the S-function displayed in
the diagram follow the standard requirements for S-functions.
To learn how to create a MEX-file for your user-written fixed-point S-function, see Create MEX-Files.