User`s guide

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