jiang2.c

通过对单片机简单i/o口的设置

#include <reg52.h>
unsigned int i;
sbit a1=P1^0;
sbit a2=P1^1;
sbit a3=P1^2;
sbit a4=P1^3;
sbit a5=P1^4;
sbit a6=P1^5;
sbit a7=P1^6;
sbit a8=P1^7;
void delay(unsigned int i);
void main()
{
	for(i=500;i>0;i--)
		{
			a1=a3=a5=a7=0xff;
			delay(i);
			a1=a3=a5=a7=0;
			delay(500-i);
		}
	for(i=500;i>0;i--)
		{
			a1=a3=a5=a7=0;
			delay(i);
			a1=a3=a5=a7=0xff;
			delay(500-i);
		}
	for(i=500;i>0;i--)
		{
			a2=a4=a6=a8=0xff;
			delay(i);
			a2=a4=a6=a8=0;
			delay(500-i);
		}
	for(i=500;i>0;i--)
		{
			a2=a4=a6=a8=0;
			delay(i);
			a2=a4=a6=a8=0xff;
			delay(500-i);
		}
}
void delay(unsigned int i)
{
	/*	unsigned int j;*/
		for(;i>0;i--);
		//	for(j=100;j>0;j--);
}