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標(biāo)題: 51控制pcf8591測(cè)溫并發(fā)給PC [打印本頁(yè)]

作者: 20151107 時(shí)間: 2015-11-21 18:11
標(biāo)題: 51控制pcf8591測(cè)溫并發(fā)給PC
功能：先向單片機(jī)發(fā)送01，單片機(jī)回AD  is  working，然后利用PCF8591上的熱敏電阻，一秒鐘測(cè)溫一百次，取平均值，一秒發(fā)送一次到PC，想單片機(jī)發(fā)送00，單片機(jī)回AD is stop，測(cè)溫停止
#include<reg52.h>
#include<intrins.h>
#include<stdio.h>
#define uchar unsigned char
#define uint unsigned int
sbit  SCL=P2^6;
sbit  SDA=P2^7;
uchar flag1,a,b,c;
float m,S;
void delay()
{ ; ; ;}

void init()
{  SCL=1;
delay();
SDA=1;
delay();
}

void start()
{ init();
   SDA=0;
   delay();
}

void stop()
{
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
delay();
}

void write(uchar date)
{    uchar i,temp;
   temp=date;
   for(i=0;i<8;i++)
   { temp=temp<<1;
      SCL=0;
      delay();
      SDA=CY;
      delay();
      SCL=1;
      delay();
   }
   SCL=0;
   delay();
   SDA=1;
   delay();
}

void respons()
{    uchar i;
   SCL=1;
   delay();
   while((SDA==1)&&(i<250))
   i++;
   SCL=0;
   delay();
}

uchar read()
{ uchar i,k;
   SCL=0;
   delay();
   SDA=1;
   delay();
   for(i=0;i<8;i++)
   {
      SCL=1;
   delay();
   k=(k<<1)|SDA;
   SCL=0;
   delay();
   }
   return k;
}
  /*
void  writeadd(uchar add,uchar date)
{ start();
   write(0x90);
   respons();
   write(add);
   respons();
   write(date);
   respons();
   stop();
}                */
uchar  readadd(uchar add)
{ uchar date;
   start();
   write(0x90);
   respons();
   write(0x40|add);
   respons();
   start();
   write(0x91);
   respons();
   date=read();
   respons();
   stop();
   return date;
}

void  inits()
{
   TMOD=0x21;
   SCON=0x50;
   TH0=(65536-10000)/256;
   TL0=(65536-10000)%256;
   TH1=0xfd;
   TL1=0xfd;
   TR1=1;
   ET0=1;
   EA=1;
   ES=1;

}

void main()
{

   while(1)
{
   inits();
   if(flag1==1)
   {
   flag1=0;
   ES=0;
   TI=1;
if(c==1)
{printf("AD is working\n");TR0=1;}
else
{  printf("AD is stop\n"); TR0=0;}

while(!TI);
TI=0;
ES=1;
}

   if(a>=100)
{
a=0;
S=S/100.0;
            ES=0;
        TI=1;
        printf("T= %f ℃",S);
        while(!TI);
        TI=0;
        ES=1;
      }
}
}

void T0_time() interrupt 1
{

   TH0=(65536-10000)/256;
   TL0=(65536-10000)%256;
   b=readadd(0);
   m=(float)b*30.0/256.0;
   S=S+m;
   a++;
}

void ser() interrupt 4
{
   RI=0;
   c=SBUF;
   flag1=1;

}

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