51单片机多路DS18B20温度测量程序

仿真文件和完整源码的下载地址：http://www.51hei.com/bbs/dpj-20600-1.html
源代码：
#include
#include
#include
#include
#define uchar unsigned char
#define uint unsigned int

sbit RS= P2^0 ;//液晶显示引脚定义
sbit RW= P2^1 ;
sbit EN= P2^2 ;
uint t=0,dian=0;
uchar LCD_LINE_ONE[16]={"tp1: "};//定义显示屏幕
uchar LCD_LINE_TWO[16]={"tp2: "};
//uchar LCD_LINE_THR[16]={" "};

int Tm;
int fushu=0 ;
sbit DQ= P3^3;
static unsigned char get_serial[]={ //获取的八个DS18B20内部RAM64位序列号
224, 0,0,0, 184, 197, 50, 40,
215, 0,0,0, 184, 197, 51, 40
// 82, 0,0,0, 184, 197, 52, 40
// 101, 0,0,0, 184, 197, 53,40,
//60, 0,0,0, 184, 197, 54,40,
//11, 0,0,0, 184, 197, 55,40,
//47, 0,0,0, 184, 197, 56,40,
//185, 0,0,0, 184, 197, 49,40,
};
void delay( ms ) //用于液晶显示的延时函数
{
int i ;
while(ms--)
{
for(i=0 ;i<5 ;i++ ) ;

}
}

uchar Read_LCD_State() //读取液晶显示的状态
{
uchar state;
RS=0;RW=1;EN=1;delay(1);
state=P0;
EN = 0;delay(1);
return state;
}
void LCD_Busy_Wait() //如果忙则等待函数
{
while((Read_LCD_State()&0x80)==0x80);
delay(5);
}

void Write_LCD_Zhilin(uchar zl) //液晶显示写指令函数
{
LCD_Busy_Wait();
RS=0;RW=0;
EN=0;
P0=zl;
EN=1;
delay(1);
EN=0;
}
void Write_LCD_shuju(uchar date) //液晶显示写数据函数
{
LCD_Busy_Wait();
RS=1;RW=0;
EN=0;
P0=date;
EN=1;
delay(1);
EN=0;
}
void LCD_INIT()//液晶显示初始化
{
Write_LCD_Zhilin(0x38); // 显示模式设置
delay(1);
Write_LCD_Zhilin(0x01); // 显示清屏
delay(1);
Write_LCD_Zhilin(0x06); // 光标移动设置
delay(1);
Write_LCD_Zhilin(0x0c); // 开及光标设置
delay(1);
}
void Display_LCD_String(uchar p,uchar *s) //液晶显示写入函数
{
uchar i;
Write_LCD_Zhilin(p|0x80); //写地址高位为一
//Write_LCD_Zhilin(0x40|0x80);
for(i=0;i<16;i++)
{
Write_LCD_shuju(s[i]);
delay(1);
}
}
/***************************************************************************************/
void delays(int us) //用于DS18B20的延时函数
{ int s;
for ( s=0; s}
void rst(void)//DS18B20初始化
{
DQ = 1;
delays(2);
DQ = 0;
delays(30); //精确延时 480~960us
DQ = 1;
delays(8);
}
void write(unsigned char ku)//DS18B20写函数
{
int i=0;
for (i=0;i<8;i++)
{
DQ=0;
DQ =ku&0x01;
delays(3);
DQ=1;
ku>>=1;
}
}
void match_rom(unsigned char *rom) //DS18B20匹配ROM函数
{
unsigned char i;
rst(); //初始化
write(0x55); //匹配ROM
for(i=8;i>0;i--)
{
write(*(rom+i-1));
}

}
unsigned int read(void) //DS18B20读函数，每次读16位
{
int i=0;
unsigned int u=0;
for (i=0;i<16;i++)
{
DQ=0;
u>>=1;
DQ=1;
if(DQ) u|=0x8000;
delays(4);
}
return (u);
}
int read0(unsigned char *seria)//读取对应温度值并转换函数
{
int temperature ;
unsigned int tp;
unsigned int lsb;
rst(); //初始化
write(0xCC); //跳过RAM
write(0x44); //温度转换
rst(); //再次初始化
write(0xCC);
match_rom(seria); //匹配ROM函数调用
write(0xBE); //读取存储器指令
tp=read(); //读取温度值
if((tp&0xf800)==0xf800)//判断正负数
{
fushu=1 ;
tp=~tp+1 ;
lsb=(unsigned int)(tp*6.25);
dian=lsb%100; //取小数部分

temperature=lsb/100;

}
else
{
fushu=0;
lsb=(unsigned int)(tp*6.25);
dian=lsb%100;

temperature=lsb/100;

}
return(temperature);
}
/*****************************************************************************************/
void main()
{
uint i ;
LCD_INIT();
EA=0 ; //使用DS18B20禁止任何中断
while(1)
{
for(i=0;i<2;i++)
{
Tm=read0(get_serial+i*8);
if(i==0) //判断是第几个的数据
{
if(fushu==0) //判断是否加负号
sprintf(LCD_LINE_ONE+5," %d", Tm);
if(fushu==1)
sprintf(LCD_LINE_ONE+5,"-%d", Tm);
sprintf(LCD_LINE_ONE+10,".%d",dian);//加入小数部分
Display_LCD_String(0x00,LCD_LINE_ONE);
}
if(i==1)
{
if(fushu==0)
sprintf(LCD_LINE_TWO+5," %d", Tm);
if(fushu==1)
sprintf(LCD_LINE_TWO+5,"-%d", Tm);
sprintf(LCD_LINE_TWO+10,".%d",dian);
Display_LCD_String(0x40,LCD_LINE_TWO);
}

}

}
}