MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador descarregar pdf (Página 140)

3 Writing S-Functions As C-MEX files

3-96

To configure an S-function to call a function-call subsystem:

1 Specify which elements are to execute the function-call system in

mdlInitializeSampleTimes. For example:

ssSetCallSystemOutput(S,0); /* call on 1st element */

ssSetCallSystemOutput(S,2); /

* call on 3rd element */

2 Execute the subsystem in the appropriate mdlOutputs or mdlUpdates

S-function routines. For example:

static void mdlOutputs(...)

{

if (((int)*uPtrs[0]) % 2 == 1) {

if (!ssCallSystemWithTid(S,0,tid)) {

/* Error occurred, which will be reported by Simulink */

return;

}

} else {

if (!ssCallSystemWithTid(S,2,tid)) {

/* Error occurred, which will be reported by Simulink */

return;

}

...

}

See simulink/src/sfun_fcncall.c for an example.

Function-callsubsystemsareapowerfulmodelingconstruct.You canconfigure

Stateflow® blocks to execute function-call subsystems, thereby extending the

capabilities and integration of state logic (Stateflow) with dataflow (Simulink).

For more information on their use in Stateflow, see the Stateflow

documentation.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador Página 140