#include<reg52.h>
#include "intrins.h"
#define uint unsigned int
#define uchar unsigned char
sbit beep=P1^5;
uchar temp;
void delay( uint z)
{
unsigned int x,y;
for(x=z;x>0;x--)
for(y=114;y>0;y--);
}
void main()
{
temp=0xf0;
P2=temp;
delay(100);
while(1)
{
beep=0;
temp=_crol_(temp,1);
P2=temp;
beep=~beep;
delay(100);
}
}
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