PIC16F690 Hi tech C Interrupt problems

[sundhir52]

Hi, i am trying to get a external interrupt working in the PIC16F690, the code seems to be ok, but when i try simulating the program in the mplab sim it just jumps straight to the ISR holds there for a while and then jumps to the infinite loop.

i am using Hi tech C compiler, and trying to just toggle the PORTB on the external interrupt, but a am at a loss as to why its not working . . . .
any help will be greatly appreciated

#include <htc.h>
#include "delay.h"


//------------------------------------
void main(void) @0x00
{
	//Initialisation

	TRISA=0xFF;
	TRISB=0x00;
	TRISC=0x00;
	PORTA=0xFF;
	PORTB=0x00;
	PORTC=0x00;

	ANSEL=0x00;
	ANSELH=0x00;
	WPUB=0x00;
	

	GIE=1;
	INTEDG=1;
	PEIE=1;
	INTE=1;
		
 
	while(1)
	{

		PORTC=0x05;
		DelayMs(20);

		PORTC=0x06;
		DelayMs(20);
		
		PORTC=0x0A;
		DelayMs(20);
	
		PORTC=0x09;
		DelayMs(20);
		
	}	
	return;
}

//Interrupt Handler

static void interrupt int_handler(void) @ 0x10
{
	if ((INTF&&INTE))
	{
		PORTB=0XFF^PORTB;	
		INTF=0;
	}
	return;
}

 

[SneaKSz]

I thought that the high/standard interrupt vector was at 08h .

# pragma code Inter=0x08
# pragma interrupt chk_isr
void Inter ( void) 
{
_asm
 GOTO chk_isr
_endasm


....


void chk_isr ( void)
//check the flags

 

[Pommie]

You have a couple of things wrong with your code.
On the 16 series chip the interrupt vector is at location 4.
The return in the interrupt - remove it as you will miss the context restoring code.
Stop telling the compiler where to place code. It already knows and you will force it to do silly things.

#include <htc.h>
#include "delay.h"


//------------------------------------
void main(void)  [COLOR="red"]// @0x00   remove[/COLOR]{
	//Initialisation

	TRISA=0xFF;
	TRISB=0x00;
	TRISC=0x00;
	PORTA=0xFF;
	PORTB=0x00;
	PORTC=0x00;

	ANSEL=0x00;
	ANSELH=0x00;
	WPUB=0x00;
	

	GIE=1;
	INTEDG=1;
	PEIE=1;
	INTE=1;
		
 
	while(1)
	{

		PORTC=0x05;
		DelayMs(20);

		PORTC=0x06;
		DelayMs(20);
		
		PORTC=0x0A;
		DelayMs(20);
	
		PORTC=0x09;
		DelayMs(20);
		
	}	
	return;
}

//Interrupt Handler

static void interrupt int_handler(void) [COLOR="red"]// @ 0x10 remove[/COLOR]
{
	if ((INTF&&INTE))
	{
		PORTB=0XFF^PORTB;	
		INTF=0;
	}
	[COLOR="red"]//return;  remove[/COLOR]
}

Mike.

 

[sundhir52]

I thought that the high/standard interrupt vector was at 08h .

# pragma code Inter=0x08
# pragma interrupt chk_isr
void Inter ( void) 
{
_asm
 GOTO chk_isr
_endasm


....


void chk_isr ( void)
//check the flags

hey i tried you way but now it just gives me compile errors on the _asm instruction . . . ??

 

[sundhir52]

hey mike, thanks i have removed the addresses,
it still does not resolve my problem of the program just entering at the interrupt handler though

 

[Pommie]

Post the code you now have. Please make sure it compiles.

Mike.

 

[sundhir52]

hey thanks it all works now, turns out there was a problem with my hi-tech C. I installed a 9.71a and now it works perfectly, thanks for all the help