mdlStart is not called during the execution of s-function

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Janez Podobnik 2015-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/228792-mdlstart-is-not-called-during-the-execution-of-s-function

评论： JanSc 2017-2-14

It seems even though I have added #define MDL_START rutine in s-function, the mdlStart function is not called. The result is that whole Matlab crashes when I start the simulink model.

I have added the ssPrintf in mdlStart to see if the function is called and I never get the message in the command window. It is strange that even if I add the ssPrintf in the mdlTerminate I also do not see the message in the command window. ssPrintf works in mdlOutputs function.

I am adding the code

    #define S_FUNCTION_NAME test8 /* Defines and Includes */
    #define S_FUNCTION_LEVEL 2
    #include "simstruc.h"
    #include "matrix.h"
    #include "mex.h"
     mxArray *array_ptr;
     static void mdlInitializeSizes(SimStruct *S)
     {
        // nothing special here
     }
     static void mdlInitializeSampleTimes(SimStruct *S)
     {
        // nothing special here
     }
     #define MDL_START
     #if defined(MDL_START)
     static void mdlStart(SimStruct *S)
     {
         ssPrintf("mdlStart\n");
         array_ptr = mexGetVariable("global", "testVar");
         if (array_ptr == NULL ) {
             array_ptr=mxCreateDoubleMatrix(1,1,mxREAL);
         }
         mxGetPr(array_ptr)[0]=0;
     }
     #endif /* MDL_START */
     static void mdlOutputs(SimStruct *S, int_T tid) {
         array_ptr = mexGetVariable("global", "testVar");
         /* Increment both MATLAB and MEX counters by 1 */
         mxGetPr(array_ptr)[0]+=1;
         /* Put variable in MATLAB global workspace */
         mexPutVariable("base", "testVar", array_ptr);
         //ssPrintf("mdlOutputs\n");
     }
     static void mdlTerminate(SimStruct *S){
         ssPrintf("mdlTerminate\n");
         mxDestroyArray(array_ptr);
     }
     #ifdef MATLAB_MEX_FILE /* Is this file being compiled as a MEX-file? */
     #include "simulink.c" /* MEX-file interface mechanism */
     #else
     #include "cg_sfun.h" /* Code generation registration function */
     #endif

Did I miss anything?

If I add the code in mdlOutputs

    if (array_ptr == NULL ) {
        array_ptr=mxCreateDoubleMatrix(1,1,mxREAL);
    }

just after

array_ptr = mexGetVariable("global", "testVar");

the simulink model runs properly.

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JanSc 2017-2-14

Hi,

I observed a similar behavior.

Took me an hour to realize, that all my code in mdlStart() is actually properly executed just the debugging output from ssPrintf() is not displayed.

BR, Jan

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