MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 198)

4 Guidelines for Writing C MEX S-Functions

4-32

ssSetInputPortOverWritable(S, 0, TRUE);

if (!ssSetNumOutputPorts(S, 1)) return;

ssSetOutputPortWidth(S, 0, DYNAMICALLY_SIZED);

ssSetOutputPortTestPoint(S, 0, FALSE);

ssSetNumSampleTimes(S, 1);

ssSetSFcnParamNotTunable(S, XDATAEVENLYSPACED_PIDX);

ssSetOptions(S, SS_OPTION_EXCEPTION_FREE_CODE);

} /* mdlInitializeSizes */

/* Function: mdlInitializeSampleTimes ==========================================

* Abstract:

* The lookup inherits its sample time from the driving block.

static void mdlInitializeSampleTimes(SimStruct *S)

{

ssSetSampleTime(S, 0, INHERITED_SAMPLE_TIME);

ssSetOffsetTime(S, 0, 0.0);

} /* end mdlInitializeSampleTimes */

#define MDL_START /* Change to #undef to remove function */

#if defined(MDL_START)

/* Function: mdlStart ==========================================================

* Abstract:

* Here we cache the state (true/false) of the XDATAEVENLYSPACED parameter.

* We do this primarily to illustrate how to “cache” parameter values (or

* information that is computed from parameter values) that do not change

* for the duration of the simulation (or in the generated code). In this

* case, rather than repeated calls to mxGetPr, we save the state once.

* This results in a slight increase in performance.

static void mdlStart(SimStruct *S)

{

SFcnCache *cache = malloc(sizeof(SFcnCache));

if (cache == NULL) {

ssSetErrorStatus(S,”memory allocation error”);

return;

}

ssSetUserData(S, cache);

if (mxGetScalar(XDATAEVENLYSPACED(S)) != 0.0){

cache->evenlySpaced = TRUE;

}else{

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 198