#include <stdlib.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <alloca.h>
#include <avr/cpufunc.h>


uint8_t j = 1;

int main(void){
    uint8_t i = 0;

    DDRA = 0xff;
    DDRB = 0x00;
    PORTB = 0xFF;

    char *p = malloc(256*sizeof(char));

    for(i=0;i<256;i++){
        p[i] = j;
        j = (j<<1)&0xff;
        if(j == 0){ j = 1; }
    }

    while(1){
        if(PINB == 0x2a){
            p[i] = (p[i] + 2)&0xff;
        }
        PORTA = p[i]&0xff;
        i++;
        if(i==256){i=0;}
    }
}