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- #include<reg51.h>
- #include<stdio.h>
- #include<intrins.h>
- unsigned int Real_temp;
- unsigned int t;
- /***************************************************/
- sbit rs =P3^0; //
- sbit rw = P3^1;
- sbit e =P3^5; //
- sbit D1=P0^0;
- sbit D2=P0^1;
- sbit D3=P0^2;
- sbit D4=P0^3;
- sbit D5=P0^4;
- sbit D6=P0^5;
- sbit D7=P0^6;
- sbit D8=P0^7;
- /**********************************************DS18B20****************************************************/
- sbit DQ=P1^2; //定義DS18b20的管腳
- /*****延時子程序*****/
- void delay(unsigned int t)
- {
- for(;t>0;t--);
- }
- /*****初始化DS18B20*****/
- unsigned char Init_DS18B20(void)
- {
- unsigned char x=0;
- DQ = 1; //DQ復(fù)位
- delay(8); //稍做延時
- DQ = 0; //單片機(jī)將DQ拉低
- delay(80); //精確延時，大于480us
- DQ = 1; //拉高總線
- delay(8);
- x = DQ; //稍做延時后，如果x=0則初始化成功，x=1則初始化失敗
- delay(4);
- return x;
- }
- /*****讀一個字節(jié)*****/
- unsigned char ReadOneChar(void)
- {
- unsigned char i=0;
- unsigned char dat = 0;
- for (i=8;i>0;i--)
- {
- DQ = 0; // 給脈沖信號
- dat>>=1;
- DQ = 1; // 給脈沖信號
- if(DQ)
- dat|=0x80;
- delay(4);
- }
- return(dat);
- }
- /*****寫一個字節(jié)*****/
- void WriteOneChar(unsigned char dat)
- {
- unsigned char i=0;
- for (i=8; i>0; i--)
- {
- DQ = 0;
- DQ = dat&0x01;
- delay(4);
- DQ = 1;
- dat>>=1;
- }
- delay(4);
- }
- /*****讀取溫度*****/
- int ReadTemperature(void)
- {
- unsigned char a=0;
- unsigned char b=0;
- unsigned int t=0;
- t=Init_DS18B20();
- if(t) return Real_temp;
- WriteOneChar(0xCC); //跳過讀序號列號的操作
- WriteOneChar(0x44); //啟動溫度轉(zhuǎn)換
- t=Init_DS18B20();
- if(t) return Real_temp;
- WriteOneChar(0xCC); //跳過讀序號列號的操作
- WriteOneChar(0xBE); //讀取溫度寄存器
- a=ReadOneChar(); //讀低8位
- b=ReadOneChar(); //讀高8位
- t=b;
- t<<=8;
- t=t|a;
- if(t<=0||t>0x630)
- return Real_temp;
- t=t*0.625+0.5;
- return (t);
- }
- /*****************************************LCD1602*************************************************/
- void write_com(unsigned char com) //命令函數(shù)
- {
- e=0;
- rs=0;
- rw=0;
- P0=com;
- delay(25);
- e=1;
- delay(100);
- e=0;
- }
- void write_data(unsigned char dat) //寫入數(shù)據(jù)
- {
- e=0;
- rs=1;
- rw=0;
- P0=dat;
- delay(25);
- e=1;
- delay(100);
- e=0;
- }
- void write_string(unsigned char hang,unsigned char add,unsigned char *p) //改變液晶中某位的值，如果要讓第一行，第五個字符開始顯示"ab cd ef" ，調(diào)用該函數(shù)如下write_string(1,5,"ab cd ef");
- {
- if(hang==1)
- write_com(0x80+add);
- else
- write_com(0x80+0x40+add);
- while(1)
- {
- if(*p == '\0') break;
- write_data(*p);
- p++;
- }
- }
- void write_zifu(unsigned char hang,unsigned char add,unsigned char date) //LCD1602上顯示特定的字符
- {
- if(hang==1)
- write_com(0x80+add);
- else
- write_com(0x80+0x40+add);
- write_data(date);
- }
- void write_sfm3_18B20(unsigned char hang,unsigned char add,unsigned int date) //LCD1602上顯示兩位十進(jìn)制數(shù)
- {
- if(hang==1)
- write_com(0x80+add);
- else
- write_com(0x80+0x40+add);
- write_data(0x30+date/100%10);
- write_data(0x30+date/10%10);
- write_data('.');
- write_data(0x30+date%10);
- }
- void init_1602() //LCD1602初始化設(shè)置
- {
- write_com(0x38);
- write_com(0x0c);
- write_com(0x06);
- delay(1000);
- write_string(1,0,"sd: ");
- write_string(2,0,"wd: ");
- write_zifu(1,8,0xdf); //顯示度
- write_zifu(1,9,'C');
- write_zifu(2,8,0xdf); //顯示度
- write_zifu(2,9,'C');
- }
- /*****************************************主函數(shù)*************************************************/
- void main()
- {
- Init_DS18B20();
- init_1602();
- while(1)
- {
- write_sfm3_18B20(2,4,ReadTemperature());
- }
- }
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