#include <reg51.h>
#define uchar unsigned char
#define uint  unsigned int
#define juli 1
//------------------- 定義1602液晶控制管腳-------------------------------------------------
sbit RS=P2^0;             
sbit RIW=P2^1;
sbit E=P2^2;
sbit int0=P3^2;  
sbit int1=P3^3;  

uchar i;

uint timecount=0;
uchar biaozhi=0;  //第一個(gè)開關(guān)
float jishi1=0;
float jishi2=0;
float speed;
float length;

//-------------------------定義數(shù)組----------------------------------------------------------
uchar tab[16]="                ";


void delay(uint xms)   //按鍵掃描延時(shí)子程序
{
   uint i,j;
   for(i=xms;i>0;i--)
      for(j=110;j>0;j--);
}
//---------------------1602寫指令時(shí)序開始------------------------------------------------------
void wi(uchar com)        
{
  uint i=200;
  RS=1;
  RIW=1;
  RS=0;
  RIW=0;
  E=0;
  E=1;
  P0=com;
  while(i--);
  E=0;
}
//---------------------1602寫指令時(shí)序結(jié)束---------------------------------------------------
//---------------------1602寫數(shù)據(jù)時(shí)序開始--------------------------------------------------
void wd(uchar dat)       
{
   uint i=200;
   RS=0;
   RIW=1;
   RS=1;
   RIW=0;
   E=0;
   E=1;
   P0=dat;
   while(i--);
   E=0;
}
//---------------------1602寫數(shù)據(jù)時(shí)序結(jié)束------------------------------------------------
void chushi()            //1602初始化程序
{

   wi(0x01);             //清屏
   wi(0x06);             //設(shè)置輸入方式  AC自動(dòng)加1，顯示不發(fā)生移位
   wi(0x0F);             //顯示開關(guān)控制 開顯示 開光標(biāo) 閃爍
   wi(0x38);             //功能設(shè)置 雙行顯示 5*8點(diǎn)陣   八位數(shù)據(jù)
}

void xianshi_speed(void)
{
unsigned long zancun=speed/1000;
  tab[6]=zancun%10+0x30;
  zancun=zancun/10;
  tab[5]=zancun%10+0x30;
  zancun=zancun/10;
  tab[3]='.';
  tab[4]=zancun%10+0x30;
  zancun=zancun/10;
  tab[2]=zancun%10+0x30;
  zancun=zancun/10;
  tab[1]=zancun%10+0x30;
  zancun=zancun/10;
  tab[0]=zancun%10+0x30;
  wi(0x89); 
  for(i=0;i<16;i++)
     {wd(tab[i]);}         //顯示數(shù)組
}
void xianshi_length(void)
{
  unsigned long zancun=length/100;
  tab[6]=zancun%10+0x30;
  zancun=zancun/10;
  tab[5]=zancun%10+0x30;
  zancun=zancun/10;
  tab[4]='.';
  tab[3]=zancun%10+0x30;
  zancun=zancun/10;
  tab[2]=zancun%10+0x30;
  zancun=zancun/10;
  tab[1]=zancun%10+0x30;
  zancun=zancun/10;
  tab[0]=zancun%10+0x30;
  wi(0xc9); 
  for(i=0;i<16;i++)
     {wd(tab[i]);}         //顯示數(shù)組
}

void main()
{
    IT0=1;
    EX0=1;

    IT1=1;
    EX1=1;

    PT1=1;

    TMOD=0x11;                 //T0工作為16位計(jì)數(shù)器（方式1），T1工作方式為16位定時(shí)器 
    TH0=0;                     //計(jì)數(shù)為65536                      
    TL0=0;                     // 
    TH1=0;     //定時(shí)器采用定時(shí)4ms.  初值為4000 
    TL1=0; 
    //TR1=1;                    //TR1=1，控制開關(guān)閉合，計(jì)數(shù)脈沖進(jìn)入T1計(jì)數(shù)器，啟動(dòng)定時(shí) 
    //TR0=1;                    //TR0=1，控制開關(guān)閉合，計(jì)數(shù)脈沖進(jìn)入T1計(jì)數(shù)器，啟動(dòng)計(jì)數(shù) 
    ET0=1;                    //定時(shí)器0開中斷 
    ET1=1;                    //定時(shí)器1開中斷

    EA=1;


   chushi();             //初始化

   wi(0x80);
   wd('s');
   wd('p');
   wd('d');
   wd('(');
   wd('m');
   wd('/');
   wd('s');
   wd(')');
   wd('=');
   wi(0xc0);
   wd('l');
   wd('e');
   wd('n');
   wd('(');
   wd('c');
   wd('m');
   wd(')');
   wd(' ');
   wd('=');
   while(1)
  {
    speed=41000/jishi1*1000000;
    length=speed*jishi2/1000000;
    if(speed>41000000000&&biaozhi==0)
	{
	  speed=0;
	  length=0;
	  biaozhi=0;
	  EX0=0;
	  EX1=1;
	}
    xianshi_speed();
    
    xianshi_length();
  }

}


void INT0_interrupt() interrupt 0 using 1
{
  //delay(30);
  //int0=1;
  delay(10);
  if(int0==0)
  {
    switch(biaozhi)
    {
     case 1:
	  {
       jishi1=timecount*65536+TH1*256+TL1;
	   EX0=0;
	   EX1=1;
       biaozhi=2;
      }break;
     case 3:   
      {
	  biaozhi=0;
	   EX0=0;
	   EX1=1;
       }break;
	   default :break;
    } 
  }
}

void INT1_interrupt() interrupt 2 using 1
{
  //delay(30);
  //int1=1;
  delay(10);
  if(int1==0)
  {
    if(biaozhi==0)  //開始計(jì)數(shù)
    {
     biaozhi=1;
     TR1=1;

	 EX1=0;
	 EX0=1;
    }
	else if(biaozhi==2)
	{
	   jishi2=timecount*65536+TH1*256+TL1;
       biaozhi=3;
       TR1=0;          //停止計(jì)時(shí)
       TH1=0;               //計(jì)數(shù)初值重裝載 
       TL1=0; 
       timecount=0;

	   EX1=0;
	   EX0=1;
	}
  }
}


void t1(void) interrupt 3 using 0       //T1中斷服務(wù) 
{ 
  TH1=0;               //計(jì)數(shù)初值重裝載 
  TL1=0; 
  timecount++; 
   if(timecount==65535) 
    {
	    timecount=0;
    }
}