#define F_CPU 8000000
#include <avr/io.h>
#include "util/delay.h"

int main(void)
{
    DDRA = 0xff;
    UCSRB = (1<<TXEN)|(1<<RXEN);
    UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);
    UBRRH = 0;
    UBRRL = 25;
    char p;

    int count1=1;
    int count2=1;
    int count3=1;
    int count4=1;
    int count5=1;
    int temp=0b00000000;

    int c1=0b00000001;
    int c2=0b00000010;
    int c3=0b00000100;
    int c4=0b00001000;
    int c5=0b00010000;

    while (1)
    {
        get_byte();
        p=UDR;

    if (p == '0')
    {
         count1=1;
         count2=1;
         count3=1;
         count4=1;
         count5=1;
        temp=temp=0b00000000;
        PORTA=temp;
        }


    if (p == '9')
    {

        temp=temp<<1;
        if (PINA&(1<<4)){temp=temp+c1;}
        PORTA=temp;

    }



         if(p == '1')
        {
            if (count1==1)
            {
                temp=temp+c1;
                count1=2;
                PORTA=temp;
            }


            else if (count1==2)
            {
                temp=temp-c1;
                count1=1;
                PORTA=temp;
            }
        }


        if(p == '2')
        {
            if (count2==1)
            {
                temp=temp+c2;
                count2=2;
                PORTA=temp;
            }


            else if (count2==2)
            {
                temp=temp-c2;
                count2=1;
                PORTA=temp;
            }
        }



        if(p == '3')
        {
            if (count3==1)
            {
                temp=temp+c3;
                count3=2;
                PORTA=temp;
            }


            else if (count3==2)
            {
                temp=temp-c3;
                count3=1;
                PORTA=temp;
            }
        }



        if(p == '4')
        {
            if (count4==1)
            {
                temp=temp+c4;
                count4=2;
                PORTA=temp;
            }


            else if (count4==2)
            {
                temp=temp-c4;
                count4=1;
                PORTA=temp;
            }
        }



        if(p == '5')
        {
            if (count5==1)
            {
                temp=temp+c5;
                count5=2;
                PORTA=temp;
            }


            else if (count5==2)
            {
                temp=temp-c5;
                count5=1;
                PORTA=temp;
            }
        }


    }
}


int get_byte(void)
{
    while(!(UCSRA&(1<<RXC)))
    {}
}