MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 85)

Overview of the C MEX S-Function Routines

3-41

Constant, triggered, and variable step sample times will not be propagated to

S-functions with port based sample times.

This is the code synopsis for

mdlSetInputPortSampleTime:

#if defined(MDL_SET_INPUT_PORT_SAMPLE_TIME) && defined(MATLAB_MEX_FILE)

static void mdlSetInputPortSampleTime(SimStruct *S,

int_T portIdx,

real_T sampleTime,

real_T offsetTime)

{

}

#endif /* MDL_SET_INPUT_PORT_SAMPLE_TIME */

See matlabrooot/simulink/src/sfun_multirate.c for an example.

mdlSetOutputPortSampleTime. This routine is called with the candidate sample

time for an inherited sample time output port. If the proposed sample time is

acceptable, the routine sets the actual port sample time usi ng

ssSetOutputPortSampleTime. If the sample time is unacceptable an error is

generated b y

ssSetErrorStatus. Any other inherited input or output ports

whose sample times are implicitly defined by the sample time of the given port

can also have their widths set by calls to

ssSetInputPortSampleTime or

ssSetOutputPortSampleTime.

Normally, sample times are propagated forwards. However, if s ources feeding

this block have an inherited sample time, then Simulink may choose to back-

propagate known sample times to this block. When back-propagating sample

times, Simulink calls this routine in succession for a ll inherited output port

signals.

This is the code synopsis for

mdSetOutputPortSampleTime:

#if defined(MDL_SET_OUTPUT_PORT_SAMPLE_TIME) && defined(MATLAB_MEX_FILE)

static void mdlSetOutputPortSampleTime(SimStruct *S,

int_T portIdx,

real_T sampleTime,

real_T offsetTime)

{

}

#endif /* MDL_SET_OUTPUT_PORT_SAMPLE_TIME */

See matlabrooot/simulink/src/sfun_multirate.c for an example.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 85