Question

用C语言如何实现左右来回的流水灯

Answer 1

#include<avr/io.h>
#include<util/delay.h>
#define INT8U unsigned char
int main()
{ INT8U b=0,direction=0;
DDRA=0xFF;
while(1)
{ if(direction==0)
PORTA=0x01<<b;
else
PORTA=0x80>>b;
if(++b==8)
{
b=0;
direction=!direction;
}
_delay_ms(60);
}
}