1、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); init(0x8a);write_data(0x72); init(0x8b);write_data(0x61); init(0x8c); init(0x8d);write_data(0x75); init(0x8e); init(0x8f); init(0xc0); init(0x
2、c1); 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); init(0xc7);write_data(shut/100);elsewrite_data(0xfe);init(0xc8);write_data(0x2e); init(0xc9);write_data(shu(t0)/10);init(0xca);
3、write_data(shut);init(0xcb);write_data(0x27);init(0xcc);write_data(0x43);init(0xcd);init(0xce);init(0xcf);void lcd_1602() /当为正温度时,液晶显示可以高位为0屏蔽. init(0x84); /temperature if(t/10000!write_data(shut/10000); if(t/1000)! init(0xc5); else init(0xc8);init(0xc9);void jiance() /初始化,即检测是否存在DS18B20.unsigned ch
4、ar 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DS18B20中读出数据 unsigned char i; unsigned long date=0; for(i=0;i=1; del(3); /保持15us将总线拉到高电平,产生读时间隙
5、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 matchrom(); write(0x44); /启动温度变换del(100); jiance(); if(f=1) f=0; write(0xbe); / 读暂存存储器 t=read(); flag=t
6、&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(); lcd_1602();头文件:#ifndef _XUANZE_H_#define _XUANZE_H_unsigned char k,f=0;sbit RS=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;p12
7、5;p+);void write(unsigned char date)/向DS18B20中写入数据 int i;8;i+) /由于是单总线每次只能写一位,一个字节需循环8次 DS=0; /主机在某一时刻将总线从高电平拉到低电平,产生写时间隙 DS=date&0x01; / 写入数据。 del(15); /写如数据要15us,ds18b20对数据采样需要15us60us,共需35us70us. 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; RW=0; E=1; P0=n;voi
8、d 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;void matchrom()/匹配ROM k=P3; switch(k) case 0: f=1;write_data(0x57);/whichwrite_data(0x68); init(0x83);write_data(0x63);write_data(0x79);/youwrite_data(0x6f);/wantwrite_data(0x6e); /press init(0xc5); init(0xca
9、); init(0xcb); init(0xcc);write_data(0x6b);/key init(0xcd); init(0xce); init(0xcf); break; case 1:write_data(0x31);/NO 1write(0x55); write(0x28); write(0x30); write(0xc5); write(0xb8); write(0x00); write(0x8e); case 2:write_data(0x32);/NO 2 write(0x31); write(0xb9); case 4:write_data(0x33); /NO 3 wr
10、ite(0x32); write(0xe0); case 8:write_data(0x34); /NO 4 write(0x33); write(0xd7); break; case 16:write_data(0x35); /NO 5 write(0x34); write(0x52); case 32:write_data(0x36);/ NO 6 write(0x35); write(0x65); case 64:write_data(0x37); /NO 7 write(0x36); write(0x3c); break; case 128: write_data(0x38);/NO 8 write(0x37); write(0x0b); default:write_data(0x50); /pleasewrite_data(0x6c); /one/keywrite_data(
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