MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario descargar pdf (Pagina 14)

1 Overview of S-Functions

1-8

calls the appropriate functions for each flag value. For a C MEX S-function,

Simulink calls the S-function routines directly. This table lists the simulation

stages, the corresponding S-function routines, and the associated

flag value

for M-file S-functions.

C MEX S-function routines must have exactly the names shown in Table 1-1.

InM-fileS-functions,youmustprovidecodethat,basedonthe

flag value,calls

the appropriate S-function routine. A template M-file S-function,

sfuntmpl.m,

is located in

matlabroot/toolbox/simulink/blocks.Thistemplateusesa

switch statement to handle the flag values.Allyouhavetodoisplaceyour

code in the correct S-function routine.

InCMEXS-functions,SimulinkdirectlycallsthecorrectS-function routinefor

the current simulation stage. A template S-function writte n in C called

sfuntmpl.c, located under simulink/src, is supplied with Simulink. For a

moreamply commented version of the templat e, see

sfuntmpl.doc in the same

directory.

Note We recommend that you use the M-file or C MEX-file template when

developing S-functions.

Table 1-1: Simulation Stages

Simulation Stage S-Function Routine Flag (M-File

S-Functions)

Initialization mdlInitializeSizes flag = 0

Calculation of next sample

hit (optional)

mdlGetTimeOfNextVarHit flag = 4

Calculation of outputs mdlOutputs flag = 3

Update discrete states mdlUpdate flag = 2

Calculation of derivatives mdlDerivatives flag = 1

Endofsimulationtasks mdlTerminate flag = 9

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 209 210

Sin comentarios

MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guía de usuario Pagina 14