MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario descargar pdf (Pagina 164)

3 Writing S-Functions As C-MEX files

3-120

• If your S-function has a nonempty mdlUpdate, then update it to this form:

#define MDL_UPDATE

static void mdlUpdate(SimStruct *S, int_T tid)

{

}

otherwise, delete the function.

• If your S-function has a nonempty

mdlDerivatives, then update it to this

form:

#define MDL_DERIVATIVES

static void mdlDerivatives(SimStruct *S, int_T tid)

{

}

otherwise, delete the function.

• Replace all obsolete SimStruct macros. See Table 3-13 for a complete list of

obsolete macros.

• When converting level 1 S-functions to l evel 2 S-functions, you should build

your S-functions with full (i.e., highest) warning levels. For example, if you

have

gcc on a UNIX system, use these options with the mex utility:

mex CC=gcc CFLAGS=-Wall sfcn.c

If your system has Lint, use this code:

lint -DMATLAB_MEX_FILE -I<matlabroot>/simulink/include

-I<matlabroot>/extern/include sfcn.c

On a PC, to use the highest warning levels, you must create a project file

insideof theintegrateddevelopmentenvironment(IDE)for thecompileryou

are using. W ithin the project file, define

MATLAB_MEX_FILE and a dd

<matlabroot>/simulink/include

<matlabroot>/extern/include

to the path (be sure to build with alignment set to 8).

The following macros are obsolete. Each obsolete macro should be replaced

with the specified macro.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario Pagina 164