999 Counter

999 counter Video on Youtube
C code on AVR microcontroller (ATmega8515L)

#include<mega8515.h>


void loopDelay(unsigned int n)
{
while (n > 0)
    {
 
    n--;
    }
}

static unsigned  char SEVEN_SEG[] = { 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};
unsigned int counter = 0x00;
unsigned int k = 0;
void main(void)
{
DDRA = 0xFF;  //Set all pin as O/P
DDRE = 0x07;
PORTE = 0x07;  // LED-on, BUZZ-off
DDRC = 0x07;

while (1)
    {        
       
        if (counter > 999) counter = 0x00;
       
        for (k=0;k<100;k++)
        {      
        PORTA = SEVEN_SEG[counter/100];
        PORTC = 0x04;            
        loopDelay(100);
        PORTA = SEVEN_SEG[(counter%100)/10];
        PORTC = 0x02;              
        loopDelay(100);
        PORTA = SEVEN_SEG[counter%10];
        PORTC = 0x01;              
        loopDelay(100);
       
        }
           
               
        counter ++;                      
    }              
}