Modificare cod C pentru un microcontroler Atmega 16p

Limbaje de Programare
,
1

Salutare.
Am nevoie de putin ajutor in modificare unui cod C pentru un ceas folosind un microcontroler Atmega 16 p.
Trebuie sa configurez 3 butoare ( Set , Up, Down ) si nu prea reusesc .
Aici am schema electrica :
schema.pdf (18.1 KB)

#define F_CPU 4000000UL
#include <avr/delay.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#define SegDataPort   PORTB
#define SegDataPin    PINB
#define SegDataDDR    DDRB
#define SegCntrlPort  PORTC
#define SegCntrlPin   PINC
#define SegCntrlDDR   DDRC
 
unsigned char hours = 0;
unsigned char minutes = 0;
unsigned char seconds = 0;


unsigned char DigitTo7SegEncoder(unsigned char digit, unsigned char common);

ISR(TIMER1_COMPA_vect);
 
int main(void)
{
    SegDataDDR = 0xFF;
  SegCntrlDDR = 0x3F;
  SegCntrlPort = 0xFF;
 
  TCCR1B = (1<<CS12|1<<WGM12);
  OCR1A = 15625-1;
  TIMSK = 1<<OCIE1A;
  sei();
 
 
  while(1)
    {
        
    if((SegCntrlPin & 0x40) == 0 )
    { 
      _delay_ms(200);
      if(minutes < 59)
        minutes++;
      else
        minutes = 0;
    }
            
    if((SegCntrlPin & 0x80) == 0 )
    { 
      _delay_ms(200);
      if(hours < 23)
        hours++;
      else
        hours = 0;
    }     
 
    SegDataPort = DigitTo7SegEncoder(seconds%10,1);
    SegCntrlPort = ~0x01;
    SegDataPort = DigitTo7SegEncoder(seconds/10,1); 
    SegCntrlPort = ~0x02;
    SegDataPort = DigitTo7SegEncoder(minutes%10,1);
    SegCntrlPort = ~0x04;
    SegDataPort = DigitTo7SegEncoder(minutes/10,1); 
    SegCntrlPort = ~0x08;
    SegDataPort = DigitTo7SegEncoder(hours%10,1); 
    SegCntrlPort = ~0x10;
    SegDataPort = DigitTo7SegEncoder(hours/10,1);
    SegCntrlPort = ~0x20;
 
    }
  return 0;
}
 
unsigned char DigitTo7SegEncoder(unsigned char digit, unsigned char common)
{
  unsigned char SegVal;
 
  switch(digit) 
  { 
    case 0: if(common == 1) SegVal = 0b00111111;
        else      SegVal = ~0b00111111;
        break;
    case 1: if(common == 1) SegVal = 0b00000110;
        else      SegVal = ~0b00000110;
        break;
    case 2: if(common == 1) SegVal = 0b01011011;
        else      SegVal = ~0b01011011;
        break;
    case 3: if(common == 1) SegVal = 0b01001111;
        else      SegVal = ~0b01001111;
        break;
    case 4: if(common == 1) SegVal = 0b01100110;
        else      SegVal = ~0b01100110;
        break;
    case 5: if(common == 1) SegVal = 0b01101101;
        else      SegVal = ~0b01101101;
        break;
    case 6: if(common == 1) SegVal = 0b01111101;
        else      SegVal = ~0b01111101;
        break;
    case 7: if(common == 1) SegVal = 0b00000111;
        else      SegVal = ~0b00000111;
        break;
    case 8: if(common == 1) SegVal = 0b01111111;
        else      SegVal = ~0b01111111;
        break;
    case 9: if(common == 1) SegVal = 0b01101111;
        else      SegVal = ~0b01101111;   
  }   
  return SegVal;
}
 
ISR(TIMER1_COMPA_vect)
{
  seconds++;
 
  if(seconds == 60)
  {
    seconds = 0;
    minutes++;
  }
  if(minutes == 60)
  {
    minutes = 0;
    hours++;    
  }
  if(hours > 23)
    hours = 0;
}