MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Podręcznik Użytkownika Pobierz pdf (Strona 176)

4 Guidelines for Writing C MEX S-Functions

4-10

This figure i llustrates the wrapper S-function concept:

Figure 4-1: How S-Functions Interface with Hand-Written Code

wrapsfcn

wrapsfcn.c

...

mdlOutputs(...)

{

...

my_alg();

}

Simulink

Placethe name of your S-functionin

the S-function block’s dialog box.

S-function

mdlOutputs in

wrapsfcn.mex

calls external

function my_alg

my_alg.c

...

real_T my_alg(real_T u)

{

...

y=f(u);

}

In Simulink,the S-function

calls mdlOutputs,which

in turn calls my_alg.

Real-Time Workshop

wrapper.c

,the generated

code, calls MdlOutputs

whichthencallsmy_alg.

wrapper.mdl

wrapper.c

...

MdlOutputs(...)

{

...

my_alg();

}

In the TLC wrapper

version of the

S-function, MdlOutputs

in wrapper.exe calls

my_alg

*The dotted line above would be the path taken if the S-function did not

havea TLC wrapper file. Ifthere is noTLC wrapper file, thegenerated code

calls

mdlOutputs.

*see note below

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