Simple operation of AVR external interrupt INT0-EEWORLD

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#include
#include
#include //Call WINAVR's interrupt library function.

volatile unsigned char count = 0; //Define loop variables. Please note that we need to add volatile here.
                                  //Because the count function will change in the interrupt function.
ISR(INT0_vect)                    //Interrupt function, note that we use ISR (interrupt name) when writing interrupt function
{
   _delay_ms(10);                //Key delay
   if((PIND&(1 << PD0)) == 0)    //Repeat anti-shake detection, only execute the statement in if when the key is pressed
   {
       count++;
       PORTB = 0xff;
       if(count > 7)
          {
           count = 0;
          }
   }
   while(!(PIND&(1 << PD0)));    //Wait for the key to be released
   _delay_ms(10);                //This is also anti-shake
}

void Interrupt_Init(void)         //Interrupt initialization function
{
   EICRA |= _BV(1);               //INT0 is a falling edge that generates an external interrupt request
   EIMSK |= _BV(INT0);             //Enable external interrupt 0
   sei();                          //Set global interrupt bit
}
int main(void)
{
   DDRB = 0xff;                   //PB port is in output mode
   PORTB = 0xff;                  //Initialize to 1

   DDRD = 0x00;                   //PD port is in input mode
   PORTD = 0xff;                  //With pull-up
   Interrupt_Init();
   while(1)
   {
       PORTB |= _BV(count);
       _delay_ms(500);
       PORTB &= ~_BV(count);
       _delay_ms(500);
   }
}

Keywords：AVR Reference address：Simple operation of AVR external interrupt INT0

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