1초마다 1칸씩 LED 시프트하기

 /*********************************************

LED 이동하기

PORTA ==> LED 연결

Tools : Codevision

http://watsim.tistory.com

*********************************************/

#include <mega128.h>

// time delay for us

void Delay_10us(char time_us)        

{

    register char i;

    for(i = 0; i < time_us; i++)            // 4 cycle +

    {

    #asm

         PUSH R0 ;         // 2 cycle +

         POP R0 ;         // 2 cycle +

         PUSH R0 ;         // 2 cycle +

         POP R0 ;         // 2 cycle +

    #endasm

    }

}

// time delay for ms

void Delay_ms(unsigned int time_ms)    

{

    register unsigned int i;

    for(i = 0; i < time_ms; i++)

    {

        Delay_10us(50);

        Delay_10us(50);

        Delay_10us(50);

        Delay_10us(50);

        Delay_10us(50);

    }

}

void main(void)

{

    char byteA=0xFE;

    DDRA=0xFF;

//     PORTA = 1;

    while (1)

    {

    Delay_ms(100);

    PORTA = byteA;

    byteA =     (byteA<<1) | 0x01;     

    if(0xff == byteA)

         byteA=0xFE;

}

}

ATMEGA128