Problem timer0 interrupt PIC18F4550

[yamine]

Hello everybody; i neeeeeeeed your help please !
this is my program :

 /** INCLUDES *******************************************************/
#include <p18cxxx.h>
#include "bootloader.h"
void low_ISR (void);
void YourLowPriorityISRCode(void);

#pragma code low_vector = 0x18
void low_ISR (void)
{
_asm goto YourLowPriorityISRCode _endasm
}

#pragma code
#pragma interruptlow YourLowPriorityISRCode
void YourLowPriorityISRCode(void)
{
	INTCONbits.TMR0IF 	= 0;  //Clear Timer 0 Interrupt Flag
	LATBbits.LATB0 	=!(LATBbits.LATB0) ;  //inverse the output
}



/** Ports Init ******************************************/
void Init_Portb(void)
{
	TRISBbits.TRISB0 = 0; 	//RB0 = output
	LATBbits.LATB0 	= 0;
	
}

/** TIMER0 Init ******************************************/
void EnableTimer (void)
{		
	TMR0H = 0x00;
	TMR0L = 0x00;
	T0CON = 0x01;  	// Timer disabled; prescalar of 1:4; 16 bit mode 		  		
	RCONbits.IPEN 		= 1;	//Enable Interrupt Priorities
	INTCONbits.GIEL 	= 1; 	//Enable Low Priority Interrupt
	INTCONbits.GIE 		= 1; 	//Enable GlobalInterrupt			  
	INTCONbits.TMR0IE 	= 1;	//Enable Timer0 Interrupt
	INTCON2bits.TMR0IP	= 0;	//TMR0 set to Low Priority Interrupt
	T0CONbits.TMR0ON = 1; //Start Timer0
}

/** MAIN Programm *************************************************/
void main(void)
{
	Init_Portb();
	EnableTimer();
	while(1);	
}

this is the error after compilation (with MPLAB v8.84, et MPLABC v3.41) ;
Error - could not find definition of symbol 'YourHighPriorityISRCode' in file './main.o'.


please help me !

 

[papunblg]

Chek this , you will understand
http://hades.mech.northwestern.edu/index.php/Compiling_for_a_bootloader_in_MPLAB

---------- Post added at 02:03 ---------- Previous post was at 02:00 ----------

**broken link removed**

 

[yamine]

Thank you for the answer,
i read this articles, i have include all necessary files "bootloader, linker " but the problem is the same !

 

[paulfjujo]

hello

you are not using same label for interrupt ?
low_vector & low_ISR

#pragma code low_vector = 0x18
void low_ISR (void)
{
_asm goto YourLowPriorityISRCode _endasm
}

 

[yamine]

thank you paulfjujo for your remark, i change the label names, and this is the error message :

Error - could not find definition of symbol 'YourHighPriorityISRCode' in file './main.o'.

Please help me!

 

[papunblg]

thank you paulfjujo for your remark, i change the label names, and this is the error message :

Error - could not find definition of symbol 'YourHighPriorityISRCode' in file './main.o'.

Please help me!

Your compiler/linker is saying that it can't find the function "YourHighPriorityISRCode" anywhere (in the object files you used, or in the library you're pulling in during the link phase).

1) make sure the function name is correct, ie no typographical errors
2) try to find who find the definition of "YourHighPriorityISRCode" in your source and check if it is being conditionally compiled, ie the code is inside a #ifdef

 

[paulfjujo]

hello

if you have a bootloader, maybe the (user) interrupt vectors arent displaced in another area...

 

[yamine]

Thank you,
BUILD SUCCEEDED !

*********** BUT my program go into interrupt subroutine just one time !
i don't know what is the problem again !

 

[paulfjujo]

hello



in the interrupt routine you don't reinitialise the timer.
and it's better to RAZ the flag just before leaving the interupt

try this

void YourLowPriorityISRCode(void)
{
	
	LATBbits.LATB0 	=! LATBbits.LATB0 ;  //inverse the output
        TMR0H = 0x00;
	TMR0L = 0x00;
        INTCONbits.TMR0IF 	= 0;  //Clear Timer 0 Interrupt Flag
}