DS18B20与数码管温度显示C程序

1、#include<reg52.h>#dcfinc uchar unsigned char#dcftnc uint unsigned intsbitDQ=Pr4;/dsl8b20 与单片机连接口unsigned char code str=0x3f,0x06,0x5b,0x4f,0x66,0x6d,()x7d,0x07,0x7f,0x6f,0x39;/共阴数码管 字码表unsigned char code strl =0x0bf,0x86,0x()db,0x0cf,0x0u6,0x0ud,0x0fd,0x87,0x0ff,0x()uf,0x39;/个 位带小数点字码表unsigned

2、 char code Bui=0x0fu,0x0fH,0x0ft>,0x0f7；uchar data disdata5;uint tvaluu;温度值uchar田ag;/温度正负标志/*ds 1820 程序*!void dclay_18B20(unsigiicd inti)延时 1 微秒whiluQ-);void dsl820rstQ/*dsl820 使位*/ unsigned char x=0;DQ = 1;DQ 县位day8B20(4);延时BQ = 0;/HQ 拉低dclay.l8B20(100); 精确还时大于 48()usBQ = 1;拉高dclay.l8B20(40);uch

3、ar dsl820rd。/喉数据*/ unsigned char i=0;unsigned char dat = 0;for (i=8;i>0;i-) DQ = 0;给脉冲信号 dat>>=l;DQ = 1; 给脉冲信号 iRDQ) dat | =()x80;delay_18B20(10);rcturn(dat); void dsl 820wr(uchar xvdata)/写数据/ unsigned char i=0;fi)r (i=8; i>0; i-)DQ = 0;DQ = wdata&OxOl;dclay_18B20(10);OQ= 1;wdata>

4、>=l;gd jump。/*读取温度值并转换*/ uchar a,b;dsl820rst();dsl 820wr(0xcc);*跳过读序列号/ ds 1820wr(0x44);* 启动温度转换*/dsl 820rst();dsl 820wr(0xcc);* 跳过读序列号/ dsl 820wr(0xbu);* 读取温度*/ a=ds1820rdO；b=dsl820rd();tvaluu=b;tvaluu<V=8;tvaluu=tvaluu | a;if(tvalue<OxOfff)tflag=O;elselvaluu= lvahiu+1;tflag=l;tvaluu=tvalu

5、u*(0.625);温度值扩大10倍，精确至lj 1位小教 rcturn(txaluc);/*树* Ivoid dsl820dispO温度值显示 uchar flagdat;uchar i;disdataO=ivaluc/l 000;百位数disdatal=lvalue%! 000/1 ()0;/ 十位数 disdata2=lvalue% 100/10;个位数disdata3=tvaluc% 10;小数位if(tflag=0)Ragdat=0x20;正温度不显示符号 elseflagdat=0x2d;/负温度显示负号:-if(disdata0=0x30)disdata()=0x20;如果百位为0,不显示if(disdatal=0x30)disdatal=0x20;如果百位为0,十位为0也不显示for(i=0;i<150;i+)P2=wci0;P0=strdisdala3; dclay_18B20(20);P2=weil;P0=strldisdata2; dc)ay_18B20(20); P2=wci2;P()=strdisdatal; day8B20(20); P2=wei3;PO=strdisdataO