lessen2-2.c

蜂鸣器响 改变蜂鸣器的频率

#include <intrins.h>
#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit led1=P0^0;
sbit led2=P0^1;
sbit led3=P0^2;
sbit led4=P0^3;
sbit led5=P0^4;
sbit led6=P0^5;
sbit led7=P0^6;
sbit led8=P0^7;
sbit led_k=P1^0;
sbit du=P1^1;
sbit we=P1^2;
void delay(int x,int y);
 main()
{   uchar a=0xfe;
	du=0;
	we=0;
	led_k=1;
	
	P0=a;
	
	while(1)
	{
		delay(1,50000);
		a=_crol_(a,1);
		P0=a;
		
		
	}
}
void delay(int x,int y)
{
		uint a,b;
		for(a=x;a>0;a--)  
		{     
			    
			for(b=y;b>0;b--);  
				
		}
}