Why I receive this error with the insertion of C code in Function Block in Simulink?????

Hello,

I'm trying to continue learning how to insert C code in the function block of simulink, but I receive an error. These are the codes:

_ Main C:_

#include <stdio.h>
#include "dobloh.h"
double u;

double main(void) {
  return 0;
}

double doble(double u){
  double car;
  car=2*u;
  return car;
}

H header:

#ifndef DOBLADOR_C_
#define DOBLADOR_C_  
double doble(double u);  
#endif /* DOBLADOR_C_ */

CCS structure:

Matlab code inside the function block:

function y = callingdoble(u)
%#codegen
y=0.0;
y = coder.ceval('doble',u);

Simulink diagram:

Error message:

Warning while parsing custom code:
In line 1 of the custom code,
this declaration has no storage class or type specifier:
|  dobloh.h
|  ^ [2 similar]
Component: Stateflow | Category: General warningOpen
Failed to parse custom code specified in model configuration parameters dialog: Simulation Target -> Custom Code. Unresolved symbols are not reported.
Component: Stateflow | Category: General warning
Making simulation target "untitled_sfun", ... 

"C:\Program Files\MATLAB\R2016a\bin\win64\mex.exe" -c  -DMATLAB_MEX_FILE -I"C:\Users\Alberto\Desktop"   -I"C:\Program Files\MATLAB\R2016a\extern\include" -I"C:\Program Files\MATLAB\R2016a\simulink\include" -I"C:\Program Files\MATLAB\R2016a\simulink\include\sf_runtime" -I"C:\Program Files\MATLAB\R2016a\stateflow\c\mex\include" -I"C:\Program Files\MATLAB\R2016a\rtw\c\src" -I"C:\Users\Alberto\Desktop\slprj\_sfprj\untitled\_self\sfun\src"    untitled_sfun.c 
Building with 'MinGW64 Compiler (C)'. 
In file included from C:\Users\Alberto\Desktop\slprj\_sfprj\untitled\_self\sfun\src\untitled_sfun.c:4:0: 
C:\Users\Alberto\Desktop\slprj\_sfprj\untitled\_self\sfun\src\untitled_sfun.h:26:7: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token 
 dobloh.h 
       ^ 

gmake: *** [untitled_sfun.obj] Error -1
Component: Make | Category: Make error
Unable to create mex function 'untitled_sfun.mexw64' required for simulation.
Component: Simulink | Category: Model error

Code of the file \untitled_sfun.h

    #ifndef __untitled_sfun_h__
    #define __untitled_sfun_h__

    /* Include files */
    #define S_FUNCTION_NAME                sf_sfun
    #include "sf_runtime/sfc_sf.h"
    #include "sf_runtime/sfc_mex.h"
    #include "sf_runtime/sf_runtime_errors.h"
    #include "rtwtypes.h"
    #include "simtarget/slClientServerAPIBridge.h"
    #include "sf_runtime/sfc_sdi.h"
    #include "sf_runtime/sf_test_language.h"
    #include "multiword_types.h"
    #include "sf_runtime/sfc_messages.h"
    #include "sf_runtime/sfcdebug.h"
    #define rtInf                          (mxGetInf())
    #define rtMinusInf                     (-(mxGetInf()))
    #define rtNaN                          (mxGetNaN())
    #define rtIsNaN(X)                     ((int)mxIsNaN(X))
    #define rtIsInf(X)                     ((int)mxIsInf(X))

    struct SfDebugInstanceStruct;
    extern struct SfDebugInstanceStruct* sfGlobalDebugInstanceStruct;

    /* Custom Code from Simulation Target dialog*/
    dobloh.h
      /* Type Definitions */
      /* Named Constants */
      /* Variable Declarations */
      extern uint32_T _untitledMachineNumber_;

    /* Variable Definitions */

    /* Function Declarations */
    extern void untitled_initializer(void);
    extern void untitled_terminator(void);

    /* Function Definitions */

    /* We load infoStruct for rtw_optimation_info on demand in mdlSetWorkWidths and
       free it immediately in mdlStart. Given that this is machine-wide as
       opposed to chart specific, we use NULL check to make sure it gets loaded
       and unloaded once per machine even though the  methods mdlSetWorkWidths/mdlStart
       are chart/instance specific. The following methods abstract this out. */
    extern mxArray* load_untitled_optimization_info(boolean_T isRtwGen, boolean_T
      isModelRef, boolean_T isExternal);
    extern void unload_untitled_optimization_info(void);

    #endif

I hope you can help me to solve this.

Thanks a lot

Regards

Alberto

Answer 1

[Alberto Prudhomme]

Solved!!,

I forget to declare the header in the configuration....