Help on understanding the warning message

Hi,

I been getting this warning message, which i couldn;t able to understand. The code was working fine. But when i added a single statment in the same file. It started giving me this warning message, which dosn;t compile to produce a object file

This is the main file, when i compile this i get the following warning message.

Code:

---

#include "include/stdint.h"
#include "include/pxa255.h"
#include "include/viperlite.h"
#include "led.h"

int main()
{
    int temp = 10;

    ledInit();
 
    // After adding this line i started getting the following warning,
    LedOff(LED_GREEN | LED_RED | LED_YELLOW);
   
    while(1)
    {
        temp = 12;
        ledToggleYellow();
        delay_ms(50);
        ledToggleGreen();
    }
   
    return 0;
}

---

And warning message

Code:

---

blink.c: In function `main':
blink.c:12: warning: implicit declaration of function `LedOff'
blink.c:17: warning: implicit declaration of function `ledToggleYellow'
blink.c:19: warning: implicit declaration of function `ledToggleGreen'

---

What does this message means, and when do we get these.

Thank you

ssharish2005

The compiler is warning you that it found no explicit function declaration for these, and has made an implicit declaration for each of these functions.

Note that implicit declaration is made as this:

int LedOff(...);

As I suppose this prototype is different from the actual one - you should include the header file containing the correct prototypes

Thank you, both of you. That solved me the problem. I never declared the prototype of the function on my header file.

Thank you once again.

ssharish2005