C51 COMPILER V8.02 BAOJING 07/06/2010 10:16:49 PAGE 1 C51 COMPILER V8.02, COMPILATION OF MODULE BAOJING OBJECT MODULE PLACED IN baojing.OBJ COMPILER INVOKED BY: D:\处理软件\keil\C51\BIN\C51.EXE baojing.c BROWSE DEBUG OBJECTEXTEND line level source 1 /***************************************************************************** 2 “天祥电子” 倾情奉献 3 www.txmcu.cn 4 www.txmcu.com 5 ******************************************************************************* 6 程序功能：实时采集当前环境温度值，并显示于数码管上。 7 同时，当温度高于某一值时（此处设为31摄氏度），蜂鸣器便会发出报警。 8 而当低于该值时，蜂鸣器自动停止报警。 9 *****************************************************************************/ 10 #include 11 #define uchar unsigned char 12 #define uint unsigned int 13 sbit DS=P2^2; //define interface 14 uint temp; // variable of temperature 15 uchar flag1; // sign of the result positive or negative 16 sbit dula=P2^6; 17 sbit wela=P2^7; 18 sbit beep=P2^3; 19 unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 20 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; 21 unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd, 22 0x87,0xff,0xef}; 23 24 void delay(uint count) //delay 25 { 26 1 uint i; 27 1 while(count) 28 1 { 29 2 i=200; 30 2 while(i>0) 31 2 i--; 32 2 count--; 33 2 } 34 1 } 35 void dsreset(void) //send reset and initialization command 36 { 37 1 uint i; 38 1 DS=0; 39 1 i=103; 40 1 while(i>0)i--; 41 1 DS=1; 42 1 i=4; 43 1 while(i>0)i--; 44 1 } 45 46 bit tmpreadbit(void) //read a bit 47 { 48 1 uint i; 49 1 bit dat; 50 1 DS=0;i++; //i++ for delay 51 1 DS=1;i++;i++; 52 1 dat=DS; 53 1 i=8;while(i>0)i--; 54 1 return (dat); 55 1 } C51 COMPILER V8.02 BAOJING 07/06/2010 10:16:49 PAGE 2 56 57 uchar tmpread(void) //read a byte date 58 { 59 1 uchar i,j,dat; 60 1 dat=0; 61 1 for(i=1;i<=8;i++) 62 1 { 63 2 j=tmpreadbit(); 64 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 65 2 } 66 1 return(dat); 67 1 } 68 69 void tmpwritebyte(uchar dat) //write a byte to ds18b20 70 { 71 1 uint i; 72 1 uchar j; 73 1 bit testb; 74 1 for(j=1;j<=8;j++) 75 1 { 76 2 testb=dat&0x01; 77 2 dat=dat>>1; 78 2 if(testb) //write 1 79 2 { 80 3 DS=0; 81 3 i++;i++; 82 3 DS=1; 83 3 i=8;while(i>0)i--; 84 3 } 85 2 else 86 2 { 87 3 DS=0; //write 0 88 3 i=8;while(i>0)i--; 89 3 DS=1; 90 3 i++;i++; 91 3 } 92 2 93 2 } 94 1 } 95 96 void tmpchange(void) //DS18B20 begin change 97 { 98 1 dsreset(); 99 1 delay(1); 100 1 tmpwritebyte(0xcc); // address all drivers on bus 101 1 tmpwritebyte(0x44); // initiates a single temperature conversion 102 1 } 103 104 uint tmp() //get the temperature 105 { 106 1 float tt; 107 1 uchar a,b; 108 1 dsreset(); 109 1 delay(1); 110 1 tmpwritebyte(0xcc); 111 1 tmpwritebyte(0xbe); 112 1 a=tmpread(); 113 1 b=tmpread(); 114 1 temp=b; 115 1 temp<<=8; //two byte compose a int variable 116 1 temp=temp|a; 117 1 tt=temp*0.0625; C51 COMPILER V8.02 BAOJING 07/06/2010 10:16:49 PAGE 3 118 1 temp=tt*10+0.5; 119 1 return temp; 120 1 } 121 122 void display(uint temp) //显示程序 123 { 124 1 uchar A1,A2,A2t,A3; 125 1 A1=temp/100; 126 1 A2t=temp%100; 127 1 A2=A2t/10; 128 1 A3=A2t%10; 129 1 dula=0; 130 1 P0=table[A1]; //显示百位 131 1 dula=1; 132 1 dula=0; 133 1 134 1 wela=0; 135 1 P0=0x7e; 136 1 wela=1; 137 1 wela=0; 138 1 delay(1); 139 1 140 1 dula=0; 141 1 P0=table1[A2]; //显示十位 142 1 dula=1; 143 1 dula=0; 144 1 145 1 wela=0; 146 1 P0=0x7d; 147 1 wela=1; 148 1 wela=0; 149 1 delay(1); 150 1 151 1 P0=table[A3]; //显示个位 152 1 dula=1; 153 1 dula=0; 154 1 155 1 P0=0x7b; 156 1 wela=1; 157 1 wela=0; 158 1 delay(1); 159 1 } 160 161 162 void main() 163 { 164 1 uchar a; 165 1 do 166 1 { 167 2 tmpchange(); 168 2 for(a=10;a>0;a--) 169 2 { 170 3 display(tmp()); 171 3 } 172 2 if(temp>=310) //当温度超过31度（仅作试验用，实际可设为其他更高的值），蜂鸣器便会报警。 173 2 { 174 3 P1=0x00; 175 3 beep=0; 176 3 } 177 2 else 178 2 { 179 3 beep=1; C51 COMPILER V8.02 BAOJING 07/06/2010 10:16:49 PAGE 4 180 3 P1=0xff; 181 3 } 182 2 } while(1); 183 1 } MODULE INFORMATION: STATIC OVERLAYABLE CODE SIZE = 476 ---- CONSTANT SIZE = 26 ---- 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)