CCS/TMS320F28069F: remedies for implicit functions are not clear.

Tool/software: Code Composer Studio

Thanks in advance,

I have 3 files, F2806x_Adc.h file, F2806x_Adc.c , Main.c file, 

File F2806x_Adc.h is as shown below.

#ifndef F2806X_ADC_H_
#define F2806X_ADC_H_

extern void ADC_Reset(void);

#endif

File F2806x_Adc.c is as shown below.

#include "F2806x_Device.h" // F2806x Header file Include File
#include <F2806x_VgAdc.h> // F2806x Examples Include File

void ADC_Reset(void)
{
EALLOW; // This is needed to write to EALLOW protected register
AdcRegs.ADCCTL1.bit.RESET = 1; //Resets the ADC (RESET = 1)
EDIS; // This is needed to disable write to EALLOW protected registers
__asm(" NOP");
__asm(" NOP");
__asm(" NOP");
}

File Main.c is as shown below.

#include "DSP28x_Project.h"     // Device Header file and Examples Include File
void main(void)
{
    ADC_Reset();
}

on building project I get following error,

"../main.c", line 4: warning #225-D: function "ADC_Reset" declared implicitly