마이크로프로세서 0503

#include <io.h>
#include <mega128.h>
#include <delay.h>
 
void main(){
    unsigned char type = 0x00;
    unsigned char i = 0b00000001;
 
    DDRB = 0xff;
    DDRD = 0x00;
    
 
    while(1){           
        PORTB = ~i;
        delay_ms(300); 
        if(type == 0x01){
            i = i << 1;  
            if(i == 0x00){
                i = 0b00000001;
            } 
        }
        if(type == 0x02){
            i = i >> 1;
            if(i == 0x00){
                i = 0b10000000;
            } 
        }
        if(type == 0x03){
            i = i<<1;
            if(i == 0b10000000){
                i = 0b10000001;
            }
            else if(i == 0b00000010){
                i = 0b00000011;
            } 
        }
        if(type == 0x04){
            if(i == 0b00001111){
                i = 0b11110000;
            }
            else if(i == 0b11110000){
                i = 0b00001111;
            } 
        }
                
        if(PIND.0 == 0){
            type = 0x01;
            i = 0b00000001;
        }
        if(PIND.1 == 0){
            type = 0x02;
            i = 0b10000000;
        }
        if(PIND.2 == 0){
            type = 0x03;
            i = 0b00000011;
        }
        if(PIND.3 == 0){
            type = 0x04;
            i = 0b00001111;
        }  
    }
                
}