Compiler Error C18 for PIC18f

[sukhavsa]

Hi

I have been using the MPLAB C18 for PIC18F8722.

I am stuck with this compiler error since morning
" Error [1111] undefined label 'ISR' in 'InterruptVector'"

here is the part of my code that involves interrupts.

/** I N T E R R U P T S **********************************************/
#pragma code InterruptVector = 0x08
void InterruptVector (void)
{
_asm
goto ISR
_endasm
}

/******** Interrupt Service Routines *************************/
#pragma interrupt ISR
void ISR (void)
{
// Check to see if TMR3 overflow caused the interrupt
int ADCvalue;
if (PIR2bits.TMR3IF)
{
ADCvalue = ADC_module();
}
}

Previously I was polling for TMR3 overflow everything was working fine and now i changed it into an ISR and it doesnt even compile.

I dont know why this error is coming up, the labels are obviously same.
This seems very trivial but i cant see anything wrong.
Please help me figure it out, I would really appreciate it.

Thanks

 

[btbass]

You need to put the function prototype at the beginning of the file.

void ISR (void);

 

[sukhavsa]

I did declare the isr prototype along with the other functions at the beginning, but still the error sustained.
This is so annoying as i cannot see anything wrong. any suggestions would help a lot.
Thanks

 

[Tahmid]

Hi,
Try this:

void InterruptVector(void);
void ISRT(void);

/** I N T E R R U P T S **********************************************/
#pragma code InterruptVector = 0x08
void InterruptVector (void)
{
_asm GOTO ISR _endasm
}

/******** Interrupt Service Routines *************************/
#pragma code
#pragma interrupt ISR
void ISR (void)
{
// Check to see if TMR3 overflow caused the interrupt
int ADCvalue;
if (PIR2bits.TMR3IF)
{
ADCvalue = ADC_module();
}
}

Hope this helps.
Tahmid.

 

[sukhavsa]

@Tahmid and btbass

Your suggestion helped.
I was declaring the prototypes before main and after defining the interrupt vectors.
Now i did the way you suggested exactly, declaring prototypes before the interrupt definition and the error is gone.

Thanks a bunch.