MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Betriebsanweisung PDF herunterladen (Seite 154)

3 Writing S-Functions As C-MEX files

3-110

ssGetSFcnParam(S,index)

Used in any routine to access a parameter entered by in the

S-function block dialog box where

index starts at 0 and is less

than

ssGetSFcnParamsCount(S).

ssSetSFcnParamNotTunable

(S,index)

Used i n mdlInitializeSizes to specify that a parameter doesn’t

change during the simulation, where

index starts at 0 and is less

than

ssGetSFcnParamsCount(S). T his wil l improve efficiencya nd

provide error handli ng in the event that a n attempt is made to

change the parameter.

Table 3-8: Parameter SimStruct Macros (Continued)

Macros Description

Table 3-9: Sample Time SimStruct Macros

Macro Description

ssSetNumSampleTimes

(S,nSampleTimes)

Usedin mdlInitializeSizes to setthe number of sampletimes

your S-function has. This must be a positive integ er greater

than 0.

ssGetNumSampleTimes(S)

Canbeusedinanyroutine(exceptmdlIntializeSizes)toget

the number of sample times your S-function has.

ssSetSampleTime

(S,st_index, value)

Used in mdlInitializeSizes to specify the “period” of the

sample time where

st_index starts at 0.

ssSetOffsetTime

(S,st_index,value)

Used in mdlInitializeSizes to specify the “offset” of the

sample time where

st_index starts at 0.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Betriebsanweisung Seite 154