MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 151)

The C MEX S-Function SimStruct

3-107

ssGetInputPortRealSignalPtrs

(S,inputPortIdx)

Canbeusedinanysimulationloop(seep.3-16)

S-function routine to access an input port signal. The

input port index starts at 0 and ends at the number of

input ports minus 1. This macro returns a pointer to an

array of pointers to the

real_T input signal elements.

Thelengthofthearrayofpointersisequaltothewidth

of the input port. For example, to read all input port

signals, use:

int_T i,j;

int_T nInputPorts = ssGetNumInputPorts(S);

for (i = 0; i < nInputPorts; i++) {

InputRealPtrsType uPtrs =

ssGetInputPortRealSignal(S,i);

int_T nu = ssGetInputPortWidth(S,i);

for (j = 0; j < nu; j++) {

SomeFunctionToUseInputSignalElement(*uPtrs

[j]);

}

ssGetInputPortSampleTime

(S,inputPortIdx)

Canbeusedinanyroutine(exceptmdlInitializeSizes)

to determine the sample time of an input port. This

should only be used if you have specified the sample

timesasport-based.

ssGetInputPortOffsetTime

(S,inputPortIdx)

Canbeusedinanyroutine(exceptmdlInitializeSizes)

to determine the offset time of an input port. This should

only be used if you have specified the sample times as

port-based.

Table 3-7: Input and Output Port Signal SimStruct Macros (Continued)

Macro Description

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 209 210

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 151