[Atmel] 用AtmelStudio6.2跑mega16例程（34）INT0记数

/*

 * GccApplication19.c

 *

 * Created: 2014-10-15 20:16:25

 *  Author: Administrator

 */ 



#define F_CPU 0x8000000UL

#include <avr/io.h>

#include <avr/interrupt.h>

#include <stdint.h>



#define KEY_CLEAR_ON() ((PIND & _BV(PD6))==0x00)



const uint8_t DSY_CODE[] = {0x3f,0x06,0x58,0x4f,0x66,0x60,0x70,0x07,0x7F,0x6F,0x00};

        

uint8_t Count = 0;



uint8_t Display_Buffer[3] = {0,0,0};

        

void Show_Count_ON_DSY()

{

   Display_Buffer[2] = Count/100;

   Display_Buffer[1] = Count % 100 / 10;

   Display_Buffer[0] = Count % 10;

   

   if(Display_Buffer[2] == 0)

   {

          Display_Buffer[2] = 10;

          if(Display_Buffer[1] == 0) Display_Buffer[1] = 10;

   }

   PORTA = DSY_CODE[Display_Buffer[2]];

   PORTB = DSY_CODE[Display_Buffer[1]];

   PORTC = DSY_CODE[Display_Buffer[0]];

}





int main(void)

{

    DDRA = 0xFF;PORTA = 0xFF;

        DDRB = 0xFF;PORTB = 0xFF;

        DDRC = 0xFF;PORTC = 0xFF;

        DDRD = 0x00;PORTD = 0xFF;

        MCUCR = 0x02;GICR = 0x40;

        SREG = 0x80;

        

        while(1)

    {

        if (KEY_CLEAR_ON())Count = 0;

                Show_Count_ON_DSY();

    }

}



ISR(INT0_vect)

{

        Count++;

        

}