基于DS18B20的52单片机的温度计设计.docx

基于单片机的ds18b20温度计设计/main.c 主程序#include #include #define dataport p0 /定义数据端口 程序中遇到dataport 则用p0 替换sbit latch1=p10;/定义锁存使能端口 段锁存sbit latch2=p11;/ 位锁存bit readtempflag;/定义读时间标志unsigned char code duanma10=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;/ 显示段码值09 共阴数码管 dp-aunsigned char code weima=0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f;/分别对应相应的数码管点亮,即位码unsigned char tempdata4; /存储显示值的全局变量void display(unsigned char firstbit,unsigned char num);/数码管显示函数void init_timer0(void);/定时器初始化void main (void) unsigned int temph,templ,temp;init_timer0();/定时器初始化while (1) /主循环 if(readtempflag=1) readtempflag=0; temp=readtemperature();/读取温度函数 if(temp&0x8000) tempdata0=0x40;/负号标志 temp=temp; / 取反加1 temp +=1; temph=temp4; templ=temp&0x0f; templ=templ*6.25/10;/小数近似处理 if(temph/10=0) tempdata1=0; /十位温度 else tempdata1=duanmatemph/10; tempdata2=duanmatemph%10|0x80; /个位温度,带小数点 tempdata3=duanmatempl; else temph=temp4; templ=temp&0x0f; templ=templ*6.25/10;/小数近似处理 if(temph/100=0) tempdata0=0; else tempdata0=duanmatemph/100; /百位温度 if(temph/100=0)&(temph%100)/10=0)/消隐 tempdata1=0;else tempdata1=duanma(temph%100)/10; /十位温度 tempdata2=duanma(temph%100)%10|0x80; /个位温度,带小数点 tempdata3=duanmatempl; void display(unsigned char firstbit,unsigned char num) static unsigned char i=0; dataport=0; /清空数据 latch1=1; /段锁存 latch1=0; dataport=weimai+firstbit; /取位码 latch2=1; /位锁存 latch2=0; dataport=tempdatai; /取显示数据，段码 latch1=1; /段锁存 latch1=0; i+; if(i=num) i=0;void init_timer0(void) /定时器初始化 tmod |= 0x01; /使用模式1，16位定时器 ea=1; /总中断打开 et0=1; /定时器中断打开 tr0=1; /定时器开关打开void timer0_isr(void) interrupt 1 /定时器中断程序 static unsigned int num; th0=(65536-2000)/256; /重新赋值 2ms tl0=(65536-2000)%256; display(0,4); / 调用数码管扫描 num+; if(num=300) / num=0; readtempflag=1; /读标志位置1/reg52.h#ifndef _reg52_h_#define _reg52_h_sfr p0 = 0x80;sfr p1 = 0x90;sfr p2 = 0xa0;sfr p3 = 0xb0;sfr psw = 0xd0;sfr acc = 0xe0;sfr b = 0xf0;sfr sp = 0x81;sfr dpl = 0x82;sfr dph = 0x83;sfr pcon = 0x87;sfr tcon = 0x88;sfr tmod = 0x89;sfr tl0 = 0x8a;sfr tl1 = 0x8b;sfr th0 = 0x8c;sfr th1 = 0x8d;sfr ie = 0xa8;sfr ip = 0xb8;sfr scon = 0x98;sfr sbuf = 0x99;/* 8052 extensions */sfr t2con = 0xc8;sfr rcap2l = 0xca;sfr rcap2h = 0xcb;sfr tl2 = 0xcc;sfr th2 = 0xcd;/* bit registers */* psw */sbit cy = psw7;sbit ac = psw6;sbit f0 = psw5;sbit rs1 = psw4;sbit rs0 = psw3;sbit ov = psw2;sbit p = psw0; /8052 sbit tf1 = tcon7;sbit tr1 = tcon6;sbit tf0 = tcon5;sbit tr0 = tcon4;sbit ie1 = tcon3;sbit it1 = tcon2;sbit ie0 = tcon1;sbit it0 = tcon0;sbit ea = ie7;sbit et2 = ie5; /8052 sbit es = ie4;sbit et1 = ie3;sbit ex1 = ie2;sbit et0 = ie1;sbit ex0 = ie0;/* ip */sbit pt2 = ip5;sbit ps = ip4;sbit pt1 = ip3;sbit px1 = ip2;sbit pt0 = ip1;sbit px0 = ip0;sbit rd = p37;sbit wr = p36;sbit t1 = p35;sbit t0 = p34;sbit int1 = p33;sbit int0 = p32;sbit txd = p31;sbit rxd = p30;sbit sm0 = scon7;sbit sm1 = scon6;sbit sm2 = scon5;sbit ren = scon4;sbit tb8 = scon3;sbit rb8 = scon2;sbit ti = scon1;sbit ri = scon0;sbit t2ex = p11; / 8052 sbit t2 = p10; / 8052 sbit tf2 = t2con7;sbit exf2 = t2con6;sbit rclk = t2con5;sbit tclk = t2con4;sbit exen2 = t2con3;sbit tr2 = t2con2;sbit c_t2 = t2con1;sbit cp_rl2 = t2con0;#endif/18b20.h#ifndef _ds18b20_h_#define _ds18b20_h_#include #define uchar unsigned char#define uint unsigned int;/*端口定义*/sbit dq=p13;/ds18b20 端口/*函数声明*/unsigned int readtemperature(void); bit init_ds18b20(void); unsigned char readonechar(void);void writeonechar(unsigned char dat);#endif/delay.c#ifndef _delay_h_#define _delay_h_/*微秒延时函数*/void delayus2x(unsigned char t);/*毫秒延时函数*/void delayms(unsigned char t);#endif/18b20.c#include #include /*18b20初始化*/bit init_ds18b20(void) bit dat=0; dq = 1; /dq复位 delayus2x(5); /稍做延时 dq = 0; /单片机将dq拉低 delayus2x(200); /精确延时 大于 480us 小于960us delayus2x(200); dq = 1; /拉高总线 delayus2x(50); /1560us 后 接收60-240us的存在脉冲 dat=dq; /如果dat=0则初始化成功, dat=1则初始化失败 delayus2x(25); /稍作延时返回 return dat;/*读取一个字节*/unsigned char readonechar(void)unsigned char i=0;unsigned char dat = 0;for (i=8;i0;i-) dq = 0; / 给脉冲信号 dat=1; dq = 1; / 给脉冲信号 if(dq) dat|=0x80; delayus2x(25); return(dat);/*写一个字节*/void writeonechar(unsigned char dat) unsigned char i=0; for (i=8; i0; i-) dq = 0; dq = dat&0x01; delayus2x(25); dq = 1; dat=1; delayus2x(25);/*读取温度函数*/unsigned int readtemperature(void)unsigned char a=0;unsigned int b=0;unsigned int t=0;init_ds18b20();/ds18b20初始化writeone