Error: "error: ld returned 1 exit status " during the deploy to hardware in Tiva C

Hello,

I'm learning how to use C code in the Simulink function block to be applied in my Tiva C launchpad. If i test the link in the simulation all works fine, the error appears when I try to deploy to the launchpad.

These are the codes:

Doblez.C Code:

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

int main() {
  return 0;
}

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

dobloh.Header:

#ifndef DOBLADOR_C_
#define DOBLADOR_C_

double doble(double u);

#endif /* DOBLADOR_C_ */

Simulink blocks:

Matlab function block code:

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

Error Message:

MW_EnergiaTivaHWInit.o MW_EnergiaTimerInit.o io_wrappers.o Energia_main.o arm_cortex_m_multitasking.o ert_main.o  -lm
ert_main.o: In function `main': 
C:\\Users\\Alberto\\Desktop\\untitled_ert_rtw/ert_main.c:39: multiple definition of `main' 
doblez.o:C:\\Users\\Alberto\\Desktop\\untitled_ert_rtw/../doblez.c:7: first defined here 
collect2.exe: error: ld returned 1 exit status 
gmake: *** [../untitled.elf] Error 1
### Creating HTML report file untitled_codegen_rpt.html
### Build procedure for model: 'untitled' aborted due to an error.
Error(s) encountered while building "untitled":
### Failed to generate all binary outputs.

I hope you can help me to understand the error, because I can't find any solution.

Thanks

Regards Alberto

Answer 1

[Walter Roberson]

Remove your lines that say

int main() {
  return 0;
}

[Alberto Prudhomme]

Thanks for your answer, it works.

But I have a question, I'm programming in Code Composer Studio, if I remove these lines I received an error, so I need to delete directly in the C file with notepad, it's possible to make it in CCS directly??

Thanks

[Walter Roberson]

I do not know anything about CCS.

[Alberto Prudhomme]

Ok, thanks for your help