MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 120)

3 Writing S-Functions As C-MEX files

3-76

* states

ssSetNumContStates(S, 0);

ssSetNumDiscStates(S, 0);

* outputs

* The upper and lower limits are scalar expanded

* so their size determines the size of the output

* only if at least one of them is not scalar.

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

if ( maxNumLimit > 1 ) {

ssSetOutputPortWidth(S, 0, maxNumLimit);

} else {

ssSetOutputPortWidth(S, 0, DYNAMICALLY_SIZED);

}

* inputs

* If the upper or lower limits are not scalar then

* the input is set to the same size. However, the

* ssSetOptions below allows the actual width to

* be reduced to 1 if needed for scalar expansion.

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

ssSetInputPortDirectFeedThrough(S, 0, 1 );

if ( maxNumLimit > 1 ) {

ssSetInputPortWidth(S, 0, maxNumLimit);

} else {

ssSetInputPortWidth(S, 0, DYNAMICALLY_SIZED);

}

* sample times

ssSetNumSampleTimes(S, 1);

* work

ssSetNumRWork(S, 0);

ssSetNumIWork(S, 0);

ssSetNumPWork(S, 0);

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 120