MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador descarregar pdf (Página 116)

3 Writing S-Functions As C-MEX files

3-72

/* Function: mdlOutputs =======================================================

* Abstract:

* y = x

static void mdlOutputs(SimStruct *S, int_T tid)

{

real_T *y = ssGetOutputPortRealSignal(S,0);

real_T *x = ssGetRealDiscStates(S);

/* Return the current state as the output */

y[0] = x[0];

}

#define MDL_UPDATE

/* Function: mdlUpdate ========================================================

* Abstract:

* This function is called once for every major integration time step.

* Discrete states are typically updated here, but this function is useful

* for performing any tasks that should only take place once per integration

* step.

static void mdlUpdate(SimStruct *S, int_T tid)

{

real_T *x = ssGetRealDiscStates(S);

InputRealPtrsType uPtrs = ssGetInputPortRealSignalPtrs(S,0);

x[0]=U(0);

}

/* Function: mdlTerminate =====================================================

* Abstract:

* No termination needed, but we are required to have this routine.

static void mdlTerminate(SimStruct *S)

{

}

#ifdef MATLAB_MEX_FILE /* Is this file being compiled as a MEX-file? */

#include "simulink.c" /* MEX-file interface mechanism */

#else

#include "cg_sfun.h" /* Code generation registration function */

#endif

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador Página 116