DS18B20与51单片机多路温度传感器教学资料.doc

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1、Good is good, but better carries it.精益求精，善益求善。DS18B20与51单片机多路温度传感器-51单片机C程序#include#include#defineucharunsignedcharsbitRS=P35;/定义LCD端口sbitRW=P36;sbitE=P37;sbitDQ=P34;/定义单总线端口ucharLCD_3,LCD_2,LCD_1,LCD_0;uchards18b20_romA8=0x8e,0x00,0x00,0x00,0xb8,0xc5,0x30,0x28;/四个DS18B20的64位ROM地址uchards18b20_romB8=

2、0x52,0x00,0x00,0x00,0xb8,0xc5,0x34,0x28;uchards18b20_romC8=0x65,0x00,0x00,0x00,0xb8,0xc5,0x35,0x28;uchards18b20_romD8=0x3c,0x00,0x00,0x00,0xb8,0xc5,0x36,0x28;ucharcodeLCDData=0123456789;ucharcodedot_tab=0112334456678899;ucharfirst_line16=A:000.0B:000.0;/LCD第一行显示缓存数组ucharsecond_line16=C:000.0D:000.0;

3、/LCD第二行显示缓存数组/*/延时程序/*voiddelay(unsignedintN)unsignedinti;for(i=0;iN;i+);/*/LCD1602测忙/*voidcheck_busy(void)while(1)P1=0xff;E=0;_nop_();RS=0;_nop_();_nop_();RW=1;_nop_();_nop_();E=1;_nop_();_nop_();_nop_();_nop_();if(P1&0x80)=0)break;E=0;/*/LCD1602写命令/*voidwrite_command(uchartempdata)E=0;_nop_();_nop

4、_();RS=0;_nop_();_nop_();RW=0;P1=tempdata;_nop_();_nop_();E=1;_nop_();_nop_();E=0;_nop_();check_busy();/*/LCD1602写数据/*voidwrite_data(uchartempdata)E=0;_nop_();_nop_();RS=1;_nop_();_nop_();RW=0;P1=tempdata;_nop_();_nop_();E=1;_nop_();_nop_();E=0;_nop_();check_busy();/*/初始化LCD1602/*voidinit_lcd1602()w

5、rite_command(0x01);/清除屏幕write_command(0x38);/功能设定（8位，2行，5*7点阵式）write_command(0x0c);/显示器ON，光标OFF，闪烁OFFwrite_command(0x06);/地址加1/*/初始化ds18b20/*bitresetpulse(void)DQ=0;delay(40);/延时500usDQ=1;delay(4);/延时60usreturn(DQ);/读取P1.0的状态voidds18b20_init(void)while(1)if(!resetpulse()/收到ds18b20的应答信号DQ=1;delay(40)

6、;/延时240usbreak;elseresetpulse();/否则再发复位信号/*/读ds18b20一位/*ucharread_bit(void)DQ=0;_nop_();_nop_();DQ=1;delay(2);return(DQ);/*/读ds18b20一个字节/*ucharread_byte(void)uchari,m,receive_data;m=1;receive_data=0;for(i=0;i8;i+)if(read_bit()receive_data=receive_data+(mi);delay(7);return(receive_data);/*/向ds18b20写一

7、位/*voidwrite_bit(ucharbitval)DQ=0;if(bitval=1)DQ=1;delay(5);DQ=1;/*/向DS18B20写一个字节命令/*voidwrite_byte(ucharval)uchari,temp;for(i=0;ii;temp=temp&0x01;write_bit(temp);delay(5);/*/64位的ROM序列号匹配/*bitmatch_rom(uchar*rom)uchari;ds18b20_init();write_byte(0x55);for(i=8;i0;i-)write_byte(*(rom+i-1);return1;/*/从d

8、s18b20中读出64位序列号/*/*uchar*read_rom(void)ucharrom8,i;ds18b20_init();write_byte(0x33);for(i=8;i0;i-)romi-1=read_byte();return&rom0;*/*/将64位序列号显示在LCD上显示出来/*/*voidprint_char(uchara)if(a=0&a=0x0a&a4)|(temp_data_h&0x0f)4)|(temp_data_h&0x0f)4);LCD_3=LCDDatatemp/100;/查表得温度百位LCD_2=LCDData(temp%100)/10;/查表得温度十

9、位LCD_1=LCDData(temp%100)%10;/查表得温度个位voiddisplay(void)uchari;write_command(0x80);for(i=0;i16;i+)write_data(first_linei);write_command(0xc0);for(i=0;i16;i+)write_data(second_linei);voidmain(void)uchartemp_data_l,temp_data_h;/*uchar*ds18b20_rom;*/init_lcd1602();/*while(1)uchari;ds18b20_rom=read_rom();/

10、读序列号write_command(0x80);for(i=0;i8;i+)ds18b20_romAi=*ds18b20_rom;ds18b20_rom+;write_command(0x80);for(i=0;i8;i+)/显示序列号print_char(ds18b20_romAi/16);print_char(ds18b20_romAi%16);*/while(1)ds18b20_init();write_byte(0xcc);write_byte(0x44);/启动温度转换delay(700);match_rom(ds18b20_romA);/匹配第一路write_byte(0xbe);

11、/读温度temp_data_l=read_byte();/温度低8位temp_data_h=read_byte();/温度高8位convert_T(temp_data_h,temp_data_l);first_line2=LCD_3;/温度转换后的各位first_line3=LCD_2;/分别存入显示缓存数组中first_line4=LCD_1;first_line6=LCD_0;match_rom(ds18b20_romB);/匹配第二路write_byte(0xbe);/读温度temp_data_l=read_byte();/温度低8位temp_data_h=read_byte();/温度

12、高8位convert_T(temp_data_h,temp_data_l);first_line10=LCD_3;/温度转换后的各位first_line11=LCD_2;/分别存入显示缓存数组中first_line12=LCD_1;first_line14=LCD_0;display();match_rom(ds18b20_romC);/匹配第三路write_byte(0xbe);/读温度temp_data_l=read_byte();/温度低8位temp_data_h=read_byte();/温度高8位convert_T(temp_data_h,temp_data_l);second_li

13、ne2=LCD_3;/温度转换后的各位second_line3=LCD_2;/分别存入显示缓存数组中second_line4=LCD_1;second_line6=LCD_0;match_rom(ds18b20_romD);/匹配第四路write_byte(0xbe);/读温度temp_data_l=read_byte();/温度低8位temp_data_h=read_byte();/温度高8位convert_T(temp_data_h,temp_data_l);second_line10=LCD_3;/温度转换后的各位second_line11=LCD_2;/分别存入显示缓存数组中second_line12=LCD_1;second_line14=LCD_0;display();-