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//--------------------------------------------------------
                     
// CVAVR
                     
// [타이머인터럽트-16] 스위치 누를 때마다 1칸씩 좌우시프트
                     
//--------------------------------------------------------
                     
#include <mega128.h>
                     
//
                     
char i=0;
                     
//
                     
interrupt [TIM1_COMPA] void timer1_compa_isr(void){ // 100ms
                     
    if(!PINE.0){ if(++i>7)i=0; }
                     
    if(!PINE.1){ if(--i<0)i=7; }
                     
}
                     
//
                     
void main(void){
                     
    PORTE=0xFF;  DDRA=0xFF;
                     
    TCCR1B=0x0B; OCR1A=24999; TIMSK=0x10; //100ms
                     
    SREG|=0x80;
                     
    while(1){
                     
       PORTA=0x01<<i;
                     
    }
                     
}
                     
                  
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cs
               
   



   

      

                  

                     
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//--------------------------------------------------------
                     
// AVRStudio
                     
// [타이머인터럽트-16] 스위치 누를 때마다 1칸씩 좌우시프트
                     
//--------------------------------------------------------
                     
#include <avr/io.h>
                     
#include <avr/interrupt.h>
                     
//
                     
volatile unsigned char i=0;
                     
//
                     
ISR(TIMER1_COMPA_vect){ // 100ms
                     
    if(!(PINE&0x01)){ if(++i>7)i=0; }
                     
    if(!(PINE&0x02)){ if(--i<0)i=7; }
                     
}
                     
//
                     
int main(void){
                     
    PORTE=0xFF;  DDRA=0xFF;
                     
    TCCR1B=0x0B; OCR1A=24999; TIMSK=0x10; //100ms
                     
    SREG|=0x80;
                     
    while(1){
                     
       PORTA=0x01<<i;
                     
    }
                     
}
                     
                  
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cs