MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Betriebsanweisung PDF herunterladen (Seite 47)

Introduction

3-3

contents. After Simulink calls mdlInitializeSizes, i t t hen interacts with the

S-function through various other routines (all starting with

mdl). At the end of

a simulation,

mdlTerminate is called.

Unlike M-file S-functions, there is not an explicit

flag parameter associated

with each C MEX S-function routine. This is because Simulink automatically

calls each S-function routine at the appro priate time during its interaction

with theS-function. Also, there are S-function routines associated with C MEX

S-functions that don’t have counterparts in M-file S-functions.

Simulink maintainsinformation abouttheS-functionin a datastructure called

the

SimStruct.The#include file, simstruc.h,thatdefinestheSimStruct

providesmacros thatenableyour MEX-fileto set values inand get values(such

as theinput and output signalt o the block) from the

SimStruct.Thestatement

thatincludesthe definitionof the

SimStruct is shownin “StatementsRequired

at the Top of S-Functi ons”o n page 3–10. The macros that access the

SimStruct

are described in “The C MEX S-Function SimStruct” on page 3–97. Commonly

used macros that are used to access the

SimStruct are des cribed in the

following sections.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Betriebsanweisung Seite 47