portone.c

来自「从各种VC源码中精选出来」· C语言 代码 · 共 30 行

//#pragma	db	code
#include	<reg51.h>

void	delay(void);
main()
{
	char	a;
    for(;;)
    {
    a=0xfe;
	delay();
	do
	{
		P1=a;
		delay();
		a=(a<<1)+1;

	}while(a!=0xff);
    }
}

void	delay()
{
	unsigned int	x=40000;
	do	{x=x-1;
		}while(x>1);
}