void delay_us(int time)
	 {     
  	  do
	  	{
		 time--;
		}	
  	  while (time>1);
	 }	  
/*	  		    毫秒級(jí)延時(shí)程序			*/	 
void delay_ms(unsigned int time)
	 {
	  while(time!=0)
	  	  {		
		   delay_us(1000);
		   time--;
		  }
	 }