DS18B20温度读取及显示

1、DS18B20温度读取及显示一二蠢一二重寻1一二蠢一二重寻1PQfA口 PQVAI1 F02fAZ FOJfA” PTA PUA” PQ*AG ROA 3： FTpzaas FS.VASF23TA11”,AMZrjjoxu rsjrtugLLX； 02，30T33 VTX， ，nn!Trn naTITT#include#dcfinc uchar unsigned char#define uint unsigned in(#dcfine wela P2#define dula POuchar code tablel=0 x3f,0 x06,0 x5b,0 x4f, 0 x66,0 x6d,0 x

2、7d,0 x07,0 x7f,0 x6f;sbit DS=P3A7;void dclay6us(uchar z)while(z);void delayms(uchar z)uchar i,j;for(i=0;iz;i+)for(j=0d160;i+);void init()uchar presence= 1;whilc( presence) DS=0;delay6us(80);延时 480us 以上DS=1;delay6us(15);if(DS=0)presence：。；while(DS=0);elsepresence= I;)uchar ds_rcad()uchar byt,bi;uchar

3、 i;for(i=0;i8;i+)DS=0;delay6us( 1);DS=1;dclay6us(l);bi=DS;byt=(byt l)|(hi7);delay611s(11);Ireturn byt;Ivoid ds_write(uchar ch)uchar i;for(i=0;i8;i+)DS=0;delay611s (I);DS=ch&0 x01;delay6us( 11);DS=1;dclay6us( 1);ch=l;void DSchange()DS=1;init();ds_write(Oxcc);ds_write(0 x44);)void DSreadtempcom()DS=1;

4、init();ds_write(Oxcc);ds_write(Oxbe);)uint DSreadternp()int temp=0;uchar tnihjml;DSchangeO;delayms( 1);DSreadtempcomO;tml=ds_read();tmh=ds_read();DS=1;tcmp=tmh;temp=8;tcmp|=tinl;return temp;)void display(uint wen(Ju)uchar bai,shi,gc,sfen,bfcn,qfcn;uchar s,tp,(h,tl;uint xs,flag;flag=wendu&0 x8000;if(

5、flag!=O)wendu=(wendu-1);th=wendu/256;tl=wendu%256;s=tl&OxOf;xs=0.0625*s* 1000;th=4;tl=4;tp=th|tl;hai=tp/IOO;shi=(tp%100)/10;ge=tp%10;sfen=xs/100;bfen=(xs% 100)/10;q fen=xs% 10;显示的百位十位个位以及小数点后三位wela=0;if(flag!=0)dula=0 x40; 显示负号elsedula=0 x00;delayms(IO);wela= 1;if(bai!=O)dula=tablebai;clsedula=OxOO;dclayms(lO);wela=2;dula=tableshi;delayms(lO);wela=3;dula=tablege|0 x80;加小数点delayms(IO);wcla=4;dula=tablesfen;dclayms(lO);wela=5;dula=tablebfen;dclayms(lO);wela=6;du