wenducaiji.c

基于PROTEUS的温度控制

#define uchar unsigned char
#define uint     unsigned int
#include<REG51.H>
sbit DQ=P3^7;
sbit P3_0=P3^0;
sbit P3_1=P3^1;
sbit P3_2=P3^2;
sbit P3_3=P3^3;

uint tcnt;
uint cursor=0;
uchar code Seg1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code Seg0[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};
uchar code Seg2[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

void delay(uint t)
{
       uint i;
       while(t--)
       {for (i=0;i<125;i++);}
}
void Tdelay(unsigned int i)	 //为8μs的延时子函数
{
while(i--);
}

Init_DS18B20(void)  //初始化子程序
  {
	unsigned char x=0;
	DQ = 1;    
	Tdelay(8);  
	DQ = 0;    	   //发复位脉冲
	Tdelay(80);   //主机发送复位脉冲至少持续480uS(此处延时应该有640us)
	DQ = 1;    	  //释放总线
	Tdelay(14);		//释放总线等待一段时间,存在等待
	Tdelay(20);
  }
//读一个字节
ReadOneChar(void)
 {
	uchar i=0;
	uchar dat = 0;
	for (i=8;i>0;i--)
	{
	     DQ = 0; 
	     dat>>=1;
	     DQ = 1; 
	     if(DQ)
	      dat|=0x80;
	     Tdelay(4);
	}
   return(dat);
 }
//写一个字节
WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
     DQ = 0;
     DQ = dat&0x01;
     Tdelay(5);
     DQ = 1;
     dat>>=1;
}
}
//读取温度
ReadTemperature(void)
{
uchar a=0;
uchar b=0;
uint t=0;
float tt=0;
Init_DS18B20();	    //初始化
WriteOneChar(0xCC); //CCH跳过ROM
WriteOneChar(0x44); //44H温度变换
Init_DS18B20();		//再次初始化
WriteOneChar(0xCC); //CCH跳过ROM
WriteOneChar(0xBE);	//BEH读暂存存储器
a=ReadOneChar();	//读低八位
b=ReadOneChar();	//读高八位
t=b;
t<<=8;
t=t|a;
tt=t*0.0625;        
t= tt*100;      
return(t);
}
void display(uchar L1,uchar L2,uchar L3,uchar L4)
{
       P2=0xFE;P0=L1;delay(1); //temp
       P2=0xFD;P0=L2;delay(1); //temp
	   P2=0xFB;P0=L3;delay(1); //temp
       P2=0xF7;P0=L4;delay(1); //temp

       }
void main()
{  uint i=0;
       
   while(1)   
   {    i=ReadTemperature();
	   delay(3);
       display(Seg1[i/1000],Seg0[i/100%10],Seg1[i/10%10],Seg1[i%10]);     
   }
}