[DK-128] LED 순차적으로 점멸하기

소스코드

#include <avr/io.h> #include<avr/signal.h> #include<avr/interrupt.h> void delay_us(unsigned char time_us) { register unsigned char i; for(i=0; i<time_us; i++) { asm volatile(" PUSH R0 "); asm volatile(" POP R0 "); asm volatile(" PUSH R0 "); asm volatile(" POP R0 "); asm volatile(" PUSH R0 "); asm volatile(" POP R0"); } } void delay_ms(unsigned int time_ms) { register unsigned int i; for(i=0; i<time_ms; i++) { delay_us(250); delay_us(250); delay_us(250); delay_us(250); } } void delay_s(unsigned int time_s) { register unsigned int i; for(i=0; i<time_s; i++) delay_ms(1000); } int main() { int iFlag1 = 0x01; int iFlag2 = 0xff; int direct = 1; DDRF = 0xff; while(1) { PORTF = iFlag1 ^ iFlag2; if(direct == 1) { iFlag1 = iFlag1<<1; if(iFlag1 == 0x80) direct = -1; } else if(direct == -1) { iFlag1 = iFlag1>>1; if(iFlag1 == 0x01) direct = 1; } delay_ms(300); } return 0; }