MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Scaricare il pdf (Pagina 61)

Overview of the C MEX S-Function Routines

3-17

The following sections discuss each of these routines and give an overview of

themorecommonmacrosusedtoaccessthe

SimStruct data structure. A full

list of the macros is given in “The C MEX S -Function SimStruct” on page 3–9 7.

Alternate Calling Structure for the Real Time Workshop

If you use the Real-Time Workshop to generate code for a model that contains

S-functions, Simulink does not go through the entire calling sequence outlined

above. Initialization proceeds as outlined above until Simulink reaches the

mdlInitializeConditions routine. After calling mdlInitializeConditions,

Simulink calls

mdlRTW, an S-function routine unique to the Real-Time

Workshop,

mdlTerminate, and exits. This picture shows the calling sequence:

Figure 3-2: S-Function Calling Sequence when Simulink is Used with the

Real-Time Workshop

For more information aboutthe Re al-Time Workshop and how it interacts with

S-functions, see The Real-Time Workshop User’s Guide and The Target

Language Compiler Reference Guide.

mdlRTW

For code generation only

p. 3-54

mdlTerminate

p. 3-53

mdlSetInputPortWidth/mdlSetOutputPortWidth

mdlInitializeSizes

mdlInitializeSampleTimes

mdlSetWorkWidths

mdlStart

p. 3-28

p. 3-35

p. 3-46

p. 3-48

p. 3-36

mdlSetInputPortSampleTime/mdlSetOutputPortSampleTime

p. 3-33

mdlInitializeConditions

p. 3-48

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guida Utente Pagina 61