C51 COMPILER V7.06 DS18B20 04/27/2020 09:49:01 PAGE 1 C51 COMPILER V7.06, COMPILATION OF MODULE DS18B20 OBJECT MODULE PLACED IN ds18b20.OBJ COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE ds18b20.c BROWSE DEBUG OBJECTEXTEND stmt level source 1 #include 2 #define uint unsigned int 3 #define uchar unsigned char 4 uint temp; // variable of temperature 5 uchar flag1; // sign of the result positive or negative 6 void delay_ds18b20(uint count) //delay 7 { 8 1 uint i; 9 1 while(count) 10 1 { 11 2 i=200; 12 2 while(i>0) 13 2 i--; 14 2 count--; 15 2 } 16 1 } 17 ///////功能:串口初始化,波特率9600，方式1/////// 18 void dsreset(void) //send reset and initialization command 19 { 20 1 uint i; 21 1 DS=0; 22 1 i=103; 23 1 while(i>0)i--; 24 1 DS=1; 25 1 i=4; 26 1 while(i>0)i--; 27 1 } 28 29 bit tmpreadbit(void) //read a bit 30 { 31 1 uint i; 32 1 bit dat; 33 1 DS=0;i++; //i++ for delay 34 1 DS=1;i++;i++; 35 1 dat=DS; 36 1 i=8;while(i>0)i--; 37 1 return (dat); 38 1 } 39 40 uchar tmpread(void) //read a byte date 41 { 42 1 uchar i,j,dat; 43 1 dat=0; 44 1 for(i=1;i<=8;i++) 45 1 { 46 2 j=tmpreadbit(); 47 2 dat=(j<<7)|(dat>>1); //读出的数据最低位在最前面，这样刚好一个字节在DAT里 48 2 } 49 1 return(dat); 50 1 } 51 52 void tmpwritebyte(uchar dat) //write a byte to ds18b20 53 { 54 1 uint i; 55 1 uchar j; C51 COMPILER V7.06 DS18B20 04/27/2020 09:49:01 PAGE 2 56 1 bit testb; 57 1 for(j=1;j<=8;j++) 58 1 { 59 2 testb=dat&0x01; 60 2 dat=dat>>1; 61 2 if(testb) //write 1 62 2 { 63 3 DS=0; 64 3 i++;i++; 65 3 DS=1; 66 3 i=8;while(i>0)i--; 67 3 } 68 2 else 69 2 { 70 3 DS=0; //write 0 71 3 i=8;while(i>0)i--; 72 3 DS=1; 73 3 i++;i++; 74 3 } 75 2 } 76 1 } 77 78 void tmpchange(void) //DS18B20 begin change 79 { 80 1 dsreset(); 81 1 delay_ds18b20(1); 82 1 tmpwritebyte(0xcc); // address all drivers on bus 83 1 tmpwritebyte(0x44); // initiates a single temperature conversion 84 1 } 85 86 uint tmp() //get the temperature 87 { 88 1 float tt; 89 1 uchar a,b; 90 1 dsreset(); 91 1 delay_ds18b20(1); 92 1 tmpwritebyte(0xcc); 93 1 tmpwritebyte(0xbe); 94 1 a=tmpread(); 95 1 b=tmpread(); 96 1 temp=b; 97 1 temp<<=8; //two byte compose a int variable 98 1 temp=temp|a; 99 1 tt=temp*0.0625; 100 1 temp=tt*10+0.5; 101 1 return temp; 102 1 } 103 104 void display_18b20(uint temp) //显示程序 105 { 106 1 uchar A1,A2,A2t,A3,ser; 107 1 ser=temp/10; 108 1 // SBUF=ser; 109 1 A1=temp/100; 110 1 A2t=temp%100; 111 1 A2=A2t/10; 112 1 A3=A2t%10; 113 1 114 1 P0=0x00; 115 1 dula=0; 116 1 P0=seg_table[A1]; //显示百位 117 1 dula=1; C51 COMPILER V7.06 DS18B20 04/27/2020 09:49:01 PAGE 3 118 1 dula=0; 119 1 P0=0xff; 120 1 wela=0; 121 1 P0=0x7e; 122 1 wela=1; 123 1 wela=0; 124 1 delay_ds18b20(2); 125 1 126 1 P0=0x00; 127 1 dula=0; 128 1 P0=seg_table[A2]|0x80; //显示十位 129 1 dula=1; 130 1 dula=0; 131 1 P0=0xff; 132 1 wela=0; 133 1 P0=0x7d; 134 1 wela=1; 135 1 wela=0; 136 1 delay_ds18b20(2); 137 1 138 1 P0=0x00; 139 1 dula=0; 140 1 P0=seg_table[A3]; //显示个位 141 1 dula=1; 142 1 dula=0; 143 1 P0=0xff; 144 1 wela=0; 145 1 P0=0x7b; 146 1 wela=1; 147 1 wela=0; 148 1 delay_ds18b20(2); 149 1 } 150 151 void ds18b20_main() 152 { 153 1 system_init(); 154 1 while(message=='5') 155 1 { 156 2 //uchar a,c; 157 2 //for(c=0;c<20;c++) 158 2 //{ 159 2 tmpchange(); 160 2 //for(a=10;a>0;a--) 161 2 //{ 162 2 display_18b20(tmp()); 163 2 //5} 164 2 //} 165 2 } 166 1 } 167 MODULE INFORMATION: STATIC OVERLAYABLE CODE SIZE = 477 ---- CONSTANT SIZE = ---- ---- XDATA SIZE = ---- ---- PDATA SIZE = ---- ---- DATA SIZE = 3 6 IDATA SIZE = ---- ---- BIT SIZE = ---- 2 END OF MODULE INFORMATION. C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)