// 頻率計
//作者：weizhao
// 時間：20080805

#include<reg51.h>
#include<stdio.h>
#include<lcd1602.h>
#include<math.h>
#define uchar unsigned char
#define uint unsigned int
sbit signal=P3^2;
uchar a[16]="Perfect!!";
void main()
{ 
 	uint period,i,k;
 	uchar r,j ;
 	idata float f,m;
 	idata  char buff[32];
 	P2=0x00;
 	while(1)
 	{
 		TMOD=0X09;
  		TH0=0;
  		TL0=0;
  		while(signal==1);
  		TR0=1;
  		while(signal==0);
  		while(signal==1);
  		TR0=0;
  		period=TH0*256+TL0;
  		while(period<=500)       /*判斷是否分頻及計算分頻次數*/
		{ 	P2++;
			i++;
			period=period*10;
    		if(i==6)
				{P2=0x00;
				break;
				}
  		}
  		k=pow(10,i);             /* 10的i次方*/
		f=(1000000.0/(2*period))*k;
   		if(f<1000)sprintf(buff,"f=%5.2fHZ",f);	   //轉化成字符串
  		else
  		 	{m=f/1000.0;
  			sprintf(buff,"f=%6.3fKHZ",m);
  		}
  		for(r=0;r<16;r++)dis[0][r]=buff[r];
  		for(j=0;j<16;j++)dis[1][j]=a[j];
 		 _1602();
 		}
}