#include
#include	
#include“lcd.h“

sbit?Trig?=?P2^1;
sbit?Echo?=?P2^0;



unsigned?char?PuZh[]=“?Pechin?Science?“;
unsigned?char?code?ASCII[15]?=????{‘0‘‘1‘‘2‘‘3‘‘4‘‘5‘‘6‘‘7‘‘8‘‘9‘‘.‘‘-‘‘M‘};

static?unsigned?char?DisNum?=?0;?//顯示用指針				??
???????unsigned?int??time=0;
	???unsigned?long?S=0;
	???bit??????flag?=0;
	???unsigned?char?disbuff[4]	???={?0000};
/*******************************************************************************
*?函?數?名?????????:?main
*?函數功能		???:?主函數
*?輸????入?????????:?無
*?輸????出?????????:?無
*******************************************************************************/
void?Conut（void）
	{
	?time=TH0*256+TL0;
	?TH0=0;
	?TL0=0;
	
	?S=（time*1.7）/100;?????//算出來是CM
	?if（（S>=700）||flag==1）?//超出測量范圍顯示“-”
	?{	?
	??flag=0;
	?
	??DisplayOneChar（0?1?ASCII[11]）;
	??DisplayOneChar（1?1?ASCII[10]）;	//顯示點
	??DisplayOneChar（2?1?ASCII[11]）;
	??DisplayOneChar（3?1?ASCII[11]）;
	??DisplayOneChar（4?1