How to add .o file in STM32 cube IDE

[Aarra.1]

Hello all,

I have referred the STM32cubeIDE user manual and found the procedure to add the .o file to the project.

I want to call a function from the added .o file.

But I get the following error.

../Core/Src/main.c:130:3: warning: implicit declaration of function 'add2Num' [-Wimplicit-function-declaration]
 130 | add2Num(1,2);

How can I solve this issue.

[KnarfB]

> But I get the following error.

No, you get a warning. The compiler doesn't see a declaration of add2Num unless you include a .h file or declared add2Num otherwise. The C compiler assumes that the linker will find your function later while linking. And, this will happen if you link the correct .o file.

hth

KnarfB

[Aarra.1]

extern int add2Num(int num1, int num2);
 
int main()
{
....
}

Thank you KnarfB for ur response.

Yes you are right. I had to declare the function name before the int main()

And it worked.