基于单片机的数字温度计c程序(Microcontroller based digital thermometer C program)

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1、基于单片机的数字温度计c程序（MicrocontrollerbaseddigitalthermometerCprogram）#包括reg52。”#包括信息。”#定义unsignedchar函数#unsignedint定义单元#定义delaynop()_nop_()；_nop_()；_nop_()；_nop_()；公司DQP22；普通双=P26；/定义锁存器锁存端普通焊接=P27；普通RS=P35；/定义1602液晶RS端公司lcden=P34；/定义1602液晶lcden端P3了S1=0；/定义按键-功能键公司S2=P31；/定义按键-增加键P3了S3=2；/定义按键-减小键P3了S4=6；/

2、闹钟查看键P3了RD=7；普通哔=P23；/定义蜂鸣器端函数代码temp_disp_title=“当前温度：“；函数current_temp_display_buffer=“临时”；函数代码alarm_temp=“报警温度高低”；函数alarm_hi_lo_str=“嗨：Lo：“；函数temp_data2=0x00,0x00；函数temp_alarm2=0x00,0x00；函数显示5=0x00,0x00,0x00,0x00,0x00；函数显示3=0x00,0x00,0x00；函数代码df_table=0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9；函数，=0；/当前读取的温度整

3、数部分函数temp_value=0x00,0x00；/从DS18B20读取的温度值函数display_digit=0,0,0,0；/待显示的各温度数位点ds18b20_is_ok=1；/传感器正常标志/-延时/1/-无效的极限（个X）我的函数；当（x）为（i0；i200；i+）；/-延时/2/-虚空Delay（个X）（x）；/-/忙检查/-无效write_com（UCHARCOM）/液晶写命令函数RS0；lcden=0；P0=COM；极限（5）；lcden=1；极限（5）；lcden=0；write_lcd_data（void函数日期）/液晶写数据函数RS1；lcden=0；P0=日期；极限（

4、5）；lcden=1；极限（5）；lcden=0；/-/设置液晶显示位置/-无效set_disp_pos（ucharPos）write_com（POS|0x80）；/-/液晶初始化/-无效initialize_lcd()函数数；RD=0；/软件将矩阵按键第4列一端置低用以分解出独立按键班杜拉=0；/关闭两锁存器锁存端，防止操作液晶时数码管会出乱码维拉=0；lcden=0；write_com（0X38）；/初始化1602液晶write_com（0x0c）；write_com（0x06）；write_com（0x01）；write_com（0x80）；/设置显示初始坐标对于（num=0；数14；数

5、+）/显示年月日星期write_lcd_data（temp_disp_title民）；极限（5）；/-/函数功能：初始化DS18B20/出口参数：现状DS18B20是否复位成功的标志/-init_ds18b20()函数函数的状态；/储存DS18B20是否存在的标志，状态=0，表示存在；状态=1，表示不存在DQ1；Delay（8）；/6微秒略微延时约先将数据线拉高DQ0；Delay（90）；/再将数据线从高拉低，要求保持480960us600/略微延时约微秒以向DS18B20发出一持续480960us的低电平复位脉冲DQ1；Delay（8）；/释放数据线（将数据线拉高）/延时约30us（释放总线

6、后需等待1560us让DS18B20输出存在脉冲）状态=DQ；Delay（100）；Todetectwhethertheoutputofthemicrocontroller/presencepulse(DQ=0saidtherewasenoughlongtimedelay)/,waitingfortheexistenceofoutputpulse.DQ=1;/datalinespulledReturnstatus;/returntestsuccess/-/function:readabyteExportparameters:dat-/readdata/-Uchar,ReadOneByte()U

7、char,I,dat=0;DQ=1;(_nop_);/thefirstdatalineup/waitforamachinecycleFor(i=0;i=1;(_nop_);/waitforamachinecycleDQ=1;/datalineartificialpullup,readyforthedetectionofDS18B20MCUoutputlevel_nop_(_nop_);();/delayofabout6us,sothatthehostsamplingin15USIf(DQdat|=0x80);/ifthereaddatais1,willbe1inDAT,ifthe0willre

8、maintheoriginalvalueunchanged.Delay(30);/3usdelay,theremustbemorethan1USoftherecoveryperiodbetweentworeadtimingDQ=1;/datalinespulled,readyforthenextdatareadReturndat;/-/function:writeabyteEntranceparameters:dat-/datatobewritten/-VoidWriteOneByte(ucharDAT)Uchari;For(i=0;i=1;/datinthe1bitbinarydata./-

9、/function:readthetemperaturevalueEntranceparameters:/-Void,Read_Temperature()If(Init_DS18B20)(/DS18B20=1)faultDS18B20_IS_OK=0;ElseWriteOneByte(0xCC);/readserialnumbercolumnnumberoperationskipWriteOneByte(0x44);/converttemperature(Init_DS18B20);/initializeDS18B20WriteOneByte(0xCC);/readserialnumberco

10、lumnnumberoperationskipWriteOneByte(0xBE);/readthetemperatureregister,thefirsttwoarelowandhightemperatureTemp_Value0=ReadOneByte(8);/lowtemperatureTemp_Value1=ReadOneByte(hightemperature);/8DS18B20_IS_OK=1;/-/function:displaythecurrenttemperatureinLCD/entranceparameters:/-Void,Display_Temperature()U

11、chari;/delayvalueandnegativeidentificationUchar,t=150,ng=0;5all1/high(0xF8)isnegative,negativecounterplus1,andsetthenegativesignIf(Temp_Value1&0xF8)=0xF8)Temp_Value1=Temp_Value1;Temp_Value0=Temp_Value0+1;If(Temp_Value0=0x00Temp_Value1+);/plus1ifthelowbyteis00bitsthatcarry,thenaddedtothehighbyteNg=1;

12、/the1negativesignDisplay_Digit0=df_TableTemp_Value0&0x0F;/findthedecimalparttemperature/getthetemperature(highbyteintegerpartofthelower3andthelowbyteinthehigh4bitunsigned)CurrentT=(Temp_Value0&0xF0)(4)|(Temp_Value1&0x07)4);/integerpartisdecomposedinto3bitdigitaltodisplayDisplay_Digit3=CurrentT/100;/

13、100digitCurrentT/100;Display_Digit2=CurrentT%100/10;/tenDisplay_Digit1=CurrentT%10;/A/LCDdisplayrefreshbufferCurrent_Temp_Display_Buffer11=Display_Digit0+0;/thefirst0willbeconvertedintotheinteger48,thenaddthedigitalfront,GetstheASCIIcharacterofthecorrespondingnumberCurrent_Temp_Display_Buffer10=.;Cu

14、rrent_Temp_Display_Buffer9=Display_Digit1+0;/ACurrent_Temp_Display_Buffer8=Display_Digit2+0;/tenCurrent_Temp_Display_Buffer7=Display_Digit3+0;/100Nottodisplay0/highIf(Display_Digit3=0)Current_Temp_Display_Buffer7=;Forthe0timeandhigh/high0times,donotshowhighIf(Display_Digit2=0andDisplay_Digit3=0)Curr

15、ent_Temp_Display_Buffer8=;/negativesymbolsaredisplayedintherightpositionIf(NG)If(Current_Temp_Display_Buffer8=)Current_Temp_Display_Buffer8=-;Elseif(Current_Temp_Display_Buffer7=)Current_Temp_Display_Buffer7=-;ElseCurrent_Temp_Display_Buffer6=-;/inthefirstrowshowtitleSet_Disp_Pos(0x00);For(i=0;i16;i

16、+)Write_LCD_Data(Temp_Disp_Titlei);Set_Disp_Pos(0x40);/inthesecondlineshowsthecurrenttemperatureFor(i=0;i16;i+)Write_LCD_Data(Current_Temp_Display_Bufferi);/temperaturedisplaysymbols/Set_Disp_Pos(0x4D);Write_LCD_Data(0x00);Set_Disp_Pos(0x4D);Write_LCD_Data(0xdf);Set_Disp_Pos(0x4E);Write_LCD_Data(C);/-/function:themainfunction/entranceparameters:/-Void,main()Initialize_LCD();Read_Temperature();Delay(50000);Delay(50000);While(1)Read_Temperature();If(DS18B20_IS_OK)Display_Temperature();Delay1(100);