DS18B20单总线多点式测温系统资料讲解.docx

1、DS18B20单总线多点式测温系统资料讲解DS18B20单总线多点式测温系统DS18B20单总线多点式测温系统1(2011-01-15 19:53:40) 转载标签： ds18b20多点测量分类： DS18B20 主文件：#include#includeunsigned int shu=0x30,0x31,0x32,0x33,0x34,0X35,0x36,0x37,0x38,0x39;unsigned long t; void flcd_1602() /当为负温度时，液晶显示可以高位为0屏蔽. init(0x80);write_data(0x4e);/NO init(0x81);write_d

2、ata(0x4f); init(0x82);write_data(0x80); init(0x85);write_data(0x74);/temperature init(0x86);write_data(0x65); init(0x87);write_data(0x6d); init(0x88);write_data(0x70); init(0x89);write_data(0x65); init(0x8a);write_data(0x72); init(0x8b);write_data(0x61); init(0x8c);write_data(0x74); init(0x8d);write

3、_data(0x75); init(0x8e);write_data(0x72); init(0x8f);write_data(0x65); init(0xc0);write_data(0x80); init(0xc1);write_data(0x80); init(0xc2);write_data(0x69); /is: init(0xc3);write_data(0x73); init(0xc4);write_data(0x3a);if(t/1000)!=0)init(0xc5);write_data(0x2d); init(0xc6);write_data(shut/1000); ini

4、t(0xc7);write_data(shut/100);elseinit(0xc5);write_data(0xfe); init(0xc6);write_data(0x2d); init(0xc7);write_data(shut/100);init(0xc8);write_data(0x2e); init(0xc9);write_data(shu(t0)/10);init(0xca);write_data(shut);init(0xcb);write_data(0x27);init(0xcc);write_data(0x43);init(0xcd);write_data(0x80);in

5、it(0xce);write_data(0x80);init(0xcf);write_data(0x80);void lcd_1602() /当为正温度时，液晶显示可以高位为0屏蔽. init(0x80);write_data(0x4e);/NO init(0x81);write_data(0x4f); init(0x82);write_data(0x80); init(0x84);write_data(0x80); init(0x85);write_data(0x74); /temperature init(0x86);write_data(0x65); init(0x87);write_d

6、ata(0x6d); init(0x88);write_data(0x70); init(0x89);write_data(0x65); init(0x8a);write_data(0x72); init(0x8b);write_data(0x61); init(0x8c);write_data(0x74); init(0x8d);write_data(0x75); init(0x8e);write_data(0x72); init(0x8f);write_data(0x65); init(0xc0);write_data(0x80); init(0xc1);write_data(0x80);

7、 init(0xc2);write_data(0x69); /is: init(0xc3);write_data(0x73); init(0xc4);write_data(0x3a); if(t/10000!=0)init(0xc5);write_data(shut/10000); init(0xc6);write_data(shut/1000); init(0xc7);write_data(shut/100); else if(t/1000)!=0) init(0xc5);write_data(0xfe); init(0xc6);write_data(shut/1000); init(0xc

8、7);write_data(shut/100); else init(0xc5);write_data(0xfe); init(0xc6);write_data(0xfe); init(0xc7);write_data(shut/100); init(0xc8);write_data(0x2e);init(0xc9);write_data(shu(t0)/10);init(0xca);write_data(shut);init(0xcb);write_data(0x27);init(0xcc);write_data(0x43);init(0xcd);write_data(0x80);init(

9、0xce);write_data(0x80);init(0xcf);write_data(0x80);void jiance() /初始化，即检测是否存在DS18B20.unsigned char k=0; loop:DS=1; DS=0; /主机将总线从高电平拉到低电平 del(100); /持续400us960us DS=1; /然后释放总线 del(10); /DS18B20检测到总线上升沿后，等待15us60u后发低电平。 k=DS; del(20); /低电平至少要持续60240us if(k=1) / 60240us内若为高电平则要重新检测。 goto loop;read() /从

10、DS18B20中读出数据 unsigned char i; unsigned long date=0; for(i=0;i=1;DS=1; del(3); /保持15us将总线拉到高电平,产生读时间隙 if(DS) date|=0x8000; del(8); /读数据需要持续35us60us. return(date);void main() unsigned long flag=0; EA=0; SP=0X60; init(0x01); /对液晶屏初始化 init(0x38); init(0x0c); init(0x06); while(1) jiance(); /对DS18B20初始化 m

11、atchrom(); write(0x44); /启动温度变换del(100); jiance(); matchrom(); if(f=1) f=0; else write(0xbe); / 读暂存存储器 t=read(); flag=t&0x8000; /对读取的数据进行处理 if(flag=0x8000) t=t; t=t+1; t=t*25; t=2; flcd_1602(); else t=t*25; t=2; lcd_1602(); 头文件：#include#ifndef _XUANZE_H_#define _XUANZE_H_unsigned char k,f=0;sbit RS=

12、P20;sbit RW=P21;sbit E=P22;sbit DS=P11;void del( int count ) /延时程序while(count-) ;void delay(unsigned int count)/延时程序int p;while(count-)for(p=0;p125;p+);void write(unsigned char date)/向DS18B20中写入数据 int i; for(i=0;i=1; void init(unsigned int n)/ RW=0,RS=0;向指令寄存器中写入命令，即对1602初始化。 delay(10); E=0; RS=0; R

13、W=0; E=1; P0=n; E=0;void write_data(unsigned char n)/RS=1,RW=0;向数据寄存器中写入数据，即显示的数符。delay(10); E=0;RS=1;RW=0;E=1;P0=n; E=0; void matchrom()/匹配ROM k=P3; switch(k) case 0: f=1; init(0x80);write_data(0x57);/which init(0x81);write_data(0x68); init(0x82);write_data(0x69); init(0x83);write_data(0x63); init(

14、0x84);write_data(0x68); init(0x85);write_data(0x80); init(0x86);write_data(0x4e);/NO init(0x87);write_data(0x4f); init(0x88);write_data(0x79);/you init(0x89);write_data(0x6f); init(0x8a);write_data(0x75); init(0x8b);write_data(0x80); init(0x8c);write_data(0x57);/want init(0x8d);write_data(0x61); ini

15、t(0x8e);write_data(0x6e); init(0x8f);write_data(0x74); init(0xc0);write_data(0x70); /press init(0xc1);write_data(0x72); init(0xc2);write_data(0x65); init(0xc3);write_data(0x73); init(0xc4);write_data(0x73); init(0xc5);write_data(0x80); init(0xc6);write_data(0x57);/which init(0xc7);write_data(0x68);

16、init(0xc8);write_data(0x69); init(0xc9);write_data(0x63); init(0xca);write_data(0x68); init(0xcb);write_data(0x80); init(0xcc);write_data(0x6b);/key init(0xcd);write_data(0x65); init(0xce);write_data(0x79); init(0xcf);write_data(0x80); break; case 1: init(0x83);write_data(0x31);/NO 1 write(0x55); wr

17、ite(0x28); write(0x30); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0x8e); break; case 2: init(0x83);write_data(0x32);/NO 2 write(0x55); write(0x28); write(0x31); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0xb9); break; case 4: init(0x83);write_

18、data(0x33); /NO 3 write(0x55); write(0x28); write(0x32); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0xe0); break; case 8: init(0x83);write_data(0x34); /NO 4 write(0x55); write(0x28); write(0x33); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0xd7)

19、; break; case 16: init(0x83);write_data(0x35); /NO 5 write(0x55); write(0x28); write(0x34); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0x52); break; case 32: init(0x83);write_data(0x36);/ NO 6 write(0x55); write(0x28); write(0x35); write(0xc5); write(0xb8); write(0x00); w

20、rite(0x00); write(0x00); write(0x65); break; case 64: init(0x83);write_data(0x37); /NO 7 write(0x55); write(0x28); write(0x36); write(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0x3c); break; case 128: init(0x83); write_data(0x38);/NO 8 write(0x55); write(0x28); write(0x37); wri

21、te(0xc5); write(0xb8); write(0x00); write(0x00); write(0x00); write(0x0b); break; default: f=1; init(0x80);write_data(0x50); /please init(0x81);write_data(0x6c); init(0x82);write_data(0x65); init(0x83);write_data(0x61); init(0x84);write_data(0x73); init(0x85);write_data(0x65); init(0x86);write_data(

22、0x80); init(0x87);write_data(0x70); /press init(0x88);write_data(0x72); init(0x89);write_data(0x65); init(0x8a);write_data(0x73); init(0x8b);write_data(0x73); init(0x8c);write_data(0x80); init(0x8d);write_data(0x6f); /one init(0x8e);write_data(0x6e); init(0x8f);write_data(0x65); init(0xc0);write_data(0x80); init(0xc1);write_data(0x80); init(0xc2);write_data(0x80); init(0xc3);write_data(0x6b);/key init(0xc4);write_data(0x65); init(0xc5);write_data(