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1、/编程：武汉理工大学XP/时间2021/5/25/DS18B20设置为12位精度/#includereg51.h unsigned char code table1=0x03,0x9f,0x25,0x0d,0x99,0x49,0x41,0x1f,0x01,0x09;/不带小数点断码 unsigned char code table2=0x02,0x9e,0x24,0x0c,0x98,0x48,0x40,0x1e,0x00,0x08; /带小数点断码unsigned char code string=temperature;unsigned char code numtable=01234567
2、89ABCDEF; /液晶显示的字符unsigned char code txttable=-. ; /液晶显示的符号，负号，小数点，以及空格unsigned char code ROM_1=0x28,0x30,0xc5,0xb8,0x00,0x00,0x00,0x8e; /U1 ROM值unsigned char code ROM_2=0x28,0x31,0xc5,0xb8,0x00,0x00,0x00,0xb9; /U2 ROM值unsigned char code ROM_3=0x28,0x32,0xc5,0xb8,0x00,0x00,0x00,0xe0; /U3 ROM值unsigne
3、d char code ROM_4=0x28,0x33,0xc5,0xb8,0x00,0x00,0x00,0xd7; /U4 ROM值unsigned char ROM=0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00; /初始化的ROM值，/用于装载读取的DS18B20的ROM值sbit ds=P30; /总线/定义的数码管接口 sbit qian=P20; /数码管千位sbit bai=P21; /数码管百位sbit shi=P22; /数码管十位sbit ge=P23; /数码管个位sbit E=P24; /液晶使能端口sbit CONTROL_DATE=P
4、25; /液晶写数据与写控制命令控制端int temp,shuju5=0; /存放温度和温度数据处理后得到的液晶要显示的数 int flag=1; /温度正负标志位/延时函数/void Delay(int z) int x;for(;z0;z-)for(x=110;x0;x-);/写入对液晶的控制命令/void Lcd_write_control(char date)CONTROL_DATE=0;P1=date;Delay(50);E=1;Delay(50);E=0;/写入要显示的数据/void Lcd_write_date(char date)CONTROL_DATE=1;P1=date;D
5、elay(10);E=1;Delay(10);E=0;/液晶初始化/void LCD_INIT(void)E=0;Lcd_write_control(0x38); /设置16*2显示，5*7点阵，8为数据接口Lcd_write_control(0x0c); /设置开显示，不显示光标Lcd_write_control(0x06); /写一个字符后地址指针加一Lcd_write_control(0x01); /显示清零，数据指针清零/DS18B20初始化/void DS_rest(void)int i;ds=0;i=103;while(i0) i-;ds=1;i=4;while(i0) i-;/读
6、一位数据/bit Temp_read_bit(void)int i;bit dat;ds=0;i+;ds=1;i+;i+;dat=ds;i=8;while(i0)i-;return dat;/读取一个字节的温度数据/unsigned char Temp_read(void)unsigned char i,j,dat;dat=0;for(i=1;i=8;i+)j=Temp_read_bit();dat=(j1);return dat;/向DS18B20写入一位数据/void DS_writebyte(unsigned char dat)int i;unsigned char j;bit test
7、b;for(j=1;j1;if(testb)ds=0;i+;i+;ds=1;i=8;while(i0) i-;else ds=0;i=8;while(i0) i-;ds=1;i+;i+;/匹配DS18B20的ROM/void MATCH_ROM(unsigned char *ROM_X) int i;DS_rest();Delay(1);DS_writebyte(0x55);for(i=0;i=90)temp=(a+b*256+1); flag=0;else temp=a+b*256; flag=1;temp=temp*6.25; return temp;/液晶显示/void Lcd_disp
8、lay(int t)int n=1,weishu1=0;static weishu2=0;Lcd_write_control(0x80+0x40);while(t0)shujun+=t%10;t/=10;weishu1=n-1;if(flag=0) Lcd_write_date(txttable0);if(weishu12;n-)Lcd_write_date(numtableshujun);Lcd_write_date(txttable1);while(n0) Lcd_write_date(numtableshujun);n-;if(weishu1weishu2) Lcd_write_date
9、(txttable2);weishu2=weishu1;/读取DS18B20的ROM数据/void READ_ROM(void) int i=0; DS_rest();Delay(1);DS_writebyte(0x33);for(i=0;i8;i+)ROMi=Temp_read();/显示DS18B20的ROM数据/void DISPLAY_ROM(void) int i; unsigned char t; Lcd_write_control(0x80);for(i=0;i4;i+) t=ROMi; Lcd_write_date(numtablet/16); Lcd_write_date(n
10、umtableROMi%16); Lcd_write_date(0x20);Lcd_write_control(0x80+0x40);for(;i8;i+) t=ROMi; Lcd_write_date(numtablet/16); Lcd_write_date(numtableROMi%16); Lcd_write_date(0x20);main()int t,i;LCD_INIT();Lcd_write_control(0x80);for(i=0;i11;i+)Lcd_write_date(stringi); /循环显示温度while(1)Temp_change();t=Get_temp();Lcd_display(t);Delay(1000);/显示DS18B20的ROM值/首先要用这个函数读取DS18B20的ROM值/然后将ROM值写到ROM数组中/最后注释掉ROM的显示，改为显示循环显示温度 /*while(1)READ_ROM();DISPLAY_ROM();