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#include<avr/io.h>                   
#include< avr/interrupt.h> 
 
#define TRUE 1                      
#define FALSE 0 
 
volatile char bLED = TRUE;
volatile int TimeCounter = 0;       // 카운트를 세기위한 변수
volatile char LEDdigit[4] = {0,0,0,0}; // LED에 켜져야 할 값 설정
 
char number[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x27, 0x7f,0x67};
char Dotnumber[10]={0xBf,0x86,0xDb,0xCf,0xE6,0xEd,0xFd,0xA7, 0xFf,0xE7};
 
 
void SetLED(int Time);
 
// Timer1번의 컴페어 인터럽트, 0.1초마다 인터럽트를 걸어준다.
ISR(TIMER1_COMPA_vect)
{
              TimeCounter++;  // 0.1초마다 카운터를 증가시킨다.
              if(bLED == TRUE) 
              {
               SetLED(TimeCounter);
              }
}
 
// LED를 켜는 인터럽트 , 16bit카운터를 사용하였다.
ISR(TIMER3_COMPA_vect)
{
static char index = 0; 
static char ctrl[4] = { ~0x08, ~0x04, ~0x02, ~0x01};
 
              index++;
              index &= 0x3; // 0,1,2,3
              PORTC = ctrl[index];
              PORTA = LEDdigit[index];
 
}
 
void SetLED(int Time)
{
 
              if(Time<9999)     {
                             int i ;
                             i = Time/1000;
                             LEDdigit[3] = number[i];
                             Time -= i * 1000;
 
                             i = Time/100;
                             LEDdigit[2] = number[i];
                             Time -= i * 100;
 
                             i = Time/10;
                             LEDdigit[1] = Dotnumber[i];
                             Time -= i * 10;
 
                             i = Time;
                             LEDdigit[0] = number[i];   
 
              }
              Else
              {
                          LEDdigit[0] = number[1];
                          LEDdigit[1] = number[2];
                          LEDdigit[2] = Dotnumber[2];
                          LEDdigit[3] = number[1];
             }
}
 
 
int main()
{
              bLED = TRUE; 
              TimeCounter = 0; 
  
              DDRC = 0x0f;
              DDRA = 0xff;
              DDRG = 0x03;
 
 
              TCCR1A = 0x00;
              TCCR1B = 0x0C;
              TCCR1C = 0x00;
              OCR1A = 6249;
              TCNT1 = 0x0000;
 
              TCCR3A = 0x00;
              TCCR3B = 0x0C;
              TCCR3C = 0x00;
              OCR3A = 250;
              TCNT3 = 0x0000;
 
              TIMSK = 0x10;
              ETIMSK = 0x10;
              TIFR = 0x00;
              ETIFR = 0x00;
 
              sei();
 
              while(1)
              {
               if(PING&0x04)
               {
                if(bLED == TRUE)                                 bLED = FALSE; 
                else                                             bLED = TRUE; 
             
                while(PING&0x04) {}
               }
               if(PING&0x08) 
               {
                TimeCounter = 0;
                SetLED(TimeCounter);
                while(PING&0x08) {}
               }
              }
              return 0;
}