avr external interrupt not working

[abilashjoseph]

hi,
i am using the interrupt in avr atmega16, while compiling the code there is no error , but at simulation the interrupt is not working. the code is given below. please help me, thanks.

#include <avr/io.h>
#include <avr/interrupt.h>
volatile int pulses=0;
ISR(INT1_vect)
{
pulses++;
}


int main(void)
{

int j =0;
int k ;
int l=0;
int m;
int i=0;
int g;
DDRB =0xff;
DDRD =0xf3;
DDRC = 0xff;
SREG =0x80;
GICR = 0xC0;
MCUCR = 0x05;

sei();
while(1)
{

PORTC = pulses;

cli();

}
}

 

[alexan_e]

sei(); enables the global interrupt flag
and cli(); disables the global interrupt flag.

As soon as you apply the cli(); all interrupts are disabled and I'm sure that it is executed before you have a chance to generate any interrupt.
If you want to disable the interrupts after the first interrupt then place it inside the interrupt routine.

Alex