Why I receive this error with the insertion of C code in Function Block in Simulink?????
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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:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161410/image.png)
Matlab code inside the function block:
function y = callingdoble(u)
%#codegen
y=0.0;
y = coder.ceval('doble',u);
Simulink diagram:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161412/image.png)
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
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