MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 131)

Examples of C MEX-File S-Function Blocks

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"the numerator, nonempty and with first "

"element nonzero");

return;

}

/* xxx verify finite */

if (mxGetNumberOfElements(TS(S)) != 1 || mxGetPr(TS(S))[0] <= 0.0) {

ssSetErrorStatus(S,"Invalid sample time specified");

return;

}

#endif /* MDL_CHECK_PARAMETERS */

/* Function: mdlInitializeSizes ===============================================

* Abstract:

* The sizes information is used by Simulink to determine the S-function

* block's characteristics (number of inputs, outputs, states, etc.).

static void mdlInitializeSizes(SimStruct *S)

{

int_T nContStates;

int_T nCoeffs;

/* See sfuntmpl.doc for more details on the macros below. */

ssSetNumSFcnParams(S, NPARAMS); /* Number of expected parameters. */

#if defined(MATLAB_MEX_FILE)

if (ssGetNumSFcnParams(S) == ssGetSFcnParamsCount(S)) {

mdlCheckParameters(S);

if (ssGetErrorStatus(S) != NULL) {

return;

}

} else {

return; /* Parameter mismatch will be reported by Simulink. */

}

#endif

* Define the characteristics of the block:

* Number of continuous states: length of denominator - 1

* Inputs port width 2 * (NumContStates+1) + 1

* Output port width 1

* DirectFeedThrough: 0 (Although this should be computed.

* We'll assume coefficients entered

* are strictly proper).

* Number of sample times: 2 (continuous and discrete)

* Number of Real work elements: 4*NumCoeffs

* (Two banks for num and den coeff's:

* NumBank0Coeffs

* DenBank0Coeffs

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 131

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