text3.c

一个单片机蜂鸣器和流水灯的实例代码

#include <reg51.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit fengming=P3^5;
uint x,y,z,n;
uchar temp; 
void delay(uint z);

void main()
{
	while(1)
	{		  	
		temp=0xfe;
		for(n=0;n<8;n++)
		{	
				P1=temp;
				delay(50);
				fengming=0x00;
				delay(50);
				fengming=0x01;
				temp=_crol_(temp,1);
		}
		temp=0x7f;
		for(n=0;n<8;n++)
		{
				P1=temp;
				delay(50);
				fengming=0x00;
				delay(50);
				fengming=0x01;
				temp=_cror_(temp,1);
		}
	}
}
void delay(uint z)
{
     for(x=z;x>0;x--)
		for(y=110;y>0;y--);	
}