MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 145)

The C MEX S-Function SimStruct

3-101

Table 3-6: Error Handling and Status SimStruct Macros

Macros Description

ssSetErrorStatus

(S,"string")

For improved performance and error handling, your S-function

should report errors using:

ssSetErrorStatus(S, "error message");

return;

Be careful when using ssSetErrorStatus in your S-function. Error

string must be persistent memory; it cannot be a local variable.

ssGetSimMode(S)

This macro can be used to determine the context in which your

S-function is executing. Current simulat ion modes are:

•

SS_SIMMODE_NORMAL — Running a “normal” Simuli nk simula tion

•

SS_SIMMODE_SIZES_CALL_ONLY — Block edit (evaluation) to

obtain number of ports

•

SS_SIMMODE_RTWGEN — Generating code

•

SS_SIMMODE_EXTERNAL — External mode simulation

ssGetSolverName(S)

This returns a char * name of the solver.

ssIsVariableStepSolver

(S)

Returns 1 if the solver being used is a variable step solver. This is

useful when creating S-functions that have zero crossings and an

inherited sample time.

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 145