C51 COMPILER V8.02 1602_WENDU 07/17/2010 10:42:44 PAGE 1 C51 COMPILER V8.02, COMPILATION OF MODULE 1602_WENDU OBJECT MODULE PLACED IN 1602-wendu.OBJ COMPILER INVOKED BY: D:\处理软件\keil\C51\BIN\C51.EXE 1602-wendu.c BROWSE DEBUG OBJECTEXTEND line level source 1 /*************************************************************** 2 “天祥电子” 倾情奉献 3 www.txmcu.com 4 www.txmcu.cn 5 ***************************************************************** 6 程序功能： 将DS18B20所采集到的温度实时显示到1602上。 7 *****************************************************************/ 8 #include 9 #include 10 #include 11 12 #define uchar unsigned char 13 #define uint unsigned int 14 sbit dula = P2^6; 15 sbit wela = P2^7; 16 17 sbit RS = P3^5; 18 sbit LCDEN = P3^4; 19 20 void delayUs() 21 { 22 1 _nop_(); 23 1 } 24 25 void delayMs(uint a) 26 { 27 1 uint i, j; 28 1 for(i = a; i > 0; i--) 29 1 for(j = 100; j > 0; j--); 30 1 } 31 32 33 void writeComm(uchar comm) 34 { 35 1 RS = 0; 36 1 P0 = comm; 37 1 LCDEN = 1; 38 1 delayUs(); 39 1 LCDEN = 0; 40 1 delayMs(1); 41 1 } 42 43 //写数据:RS=1, RW=0; 44 void writeData(uchar dat) 45 { 46 1 RS = 1; 47 1 P0 = dat; 48 1 LCDEN = 1; 49 1 delayUs(); 50 1 LCDEN = 0; 51 1 delayMs(1); 52 1 } 53 54 55 void init() C51 COMPILER V8.02 1602_WENDU 07/17/2010 10:42:44 PAGE 2 56 { 57 1 58 1 dula = wela = 0; 59 1 writeComm(0x38); 60 1 writeComm(0x0c); 61 1 writeComm(0x06); 62 1 writeComm(0x01); 63 1 } 64 65 void writeString(uchar * str, uchar length) 66 { 67 1 uchar i; 68 1 for(i = 0; i < length; i++) 69 1 { 70 2 writeData(str[i]); 71 2 } 72 1 } 73 74 /**//*****************************DS18B20*******************************/ 75 sbit ds = P2^2; 76 void dsInit() 77 { 78 1 79 1 unsigned int i; 80 1 ds = 0; 81 1 i = 100; 82 1 while(i>0) i--; 83 1 ds = 1; 84 1 i = 4; 85 1 while(i>0) i--; 86 1 } 87 88 void dsWait() 89 { 90 1 unsigned int i; 91 1 while(ds); 92 1 while(~ds); 93 1 i = 4; 94 1 while(i > 0) i--; 95 1 } 96 97 98 bit readBit() 99 { 100 1 unsigned int i; 101 1 bit b; 102 1 ds = 0; 103 1 i++; 104 1 ds = 1; 105 1 i++; i++; 106 1 b = ds; 107 1 i = 8; 108 1 while(i>0) i--; 109 1 return b; 110 1 } 111 112 unsigned char readByte() 113 { 114 1 unsigned int i; 115 1 unsigned char j, dat; 116 1 dat = 0; 117 1 for(i=0; i<8; i++) C51 COMPILER V8.02 1602_WENDU 07/17/2010 10:42:44 PAGE 3 118 1 { 119 2 j = readBit(); 120 2 121 2 dat = (j << 7) | (dat >> 1); 122 2 } 123 1 return dat; 124 1 } 125 126 127 void writeByte(unsigned char dat) 128 { 129 1 unsigned int i; 130 1 unsigned char j; 131 1 bit b; 132 1 for(j = 0; j < 8; j++) 133 1 { 134 2 b = dat & 0x01; 135 2 dat >>= 1; 136 2 137 2 if(b) 138 2 { 139 3 ds = 0; i++; i++; 140 3 ds = 1; 141 3 i = 8; while(i>0) i--; 142 3 } 143 2 else 144 2 { 145 3 ds = 0; 146 3 i = 8; while(i>0) i--; 147 3 ds = 1; 148 3 i++; i++; 149 3 } 150 2 } 151 1 } 152 153 154 void sendChangeCmd() 155 { 156 1 dsInit(); 157 1 dsWait(); 158 1 delayMs(1); 159 1 writeByte(0xcc); 160 1 writeByte(0x44); 161 1 } 162 163 void sendReadCmd() 164 { 165 1 dsInit(); 166 1 dsWait(); 167 1 delayMs(1); 168 1 writeByte(0xcc); 169 1 writeByte(0xbe); 170 1 } 171 172 173 int getTmpValue() 174 { 175 1 unsigned int tmpvalue; 176 1 int value; 177 1 float t; 178 1 unsigned char low, high; 179 1 sendReadCmd(); C51 COMPILER V8.02 1602_WENDU 07/17/2010 10:42:44 PAGE 4 180 1 181 1 low = readByte(); 182 1 high = readByte(); 183 1 184 1 tmpvalue = high; 185 1 tmpvalue <<= 8; 186 1 tmpvalue |= low; 187 1 value = tmpvalue; 188 1 189 1 \ 190 1 t = value * 0.0625; 191 1 \ 192 1 value = t * 100 + (value > 0 ? 0.5 : -0.5); //大于0加0.5, 小于0减0.5 193 1 return value; 194 1 } 195 196 void display(int v) 197 { 198 1 unsigned char count; 199 1 unsigned char datas[] = {0, 0, 0, 0, 0}; 200 1 unsigned int tmp = abs(v); 201 1 datas[0] = tmp / 10000; 202 1 datas[1] = tmp % 10000 / 1000; 203 1 datas[2] = tmp % 1000 / 100; 204 1 datas[3] = tmp % 100 / 10; 205 1 datas[4] = tmp % 10; 206 1 writeComm(0xc0+3); 207 1 if(v < 0) 208 1 { 209 2 writeString("- ", 2); 210 2 } 211 1 else 212 1 { 213 2 writeString("+ ", 2); 214 2 } 215 1 if(datas[0] != 0) 216 1 { 217 2 writeData('0'+datas[0]); 218 2 } 219 1 for(count = 1; count != 5; count++) 220 1 { 221 2 writeData('0'+datas[count]); 222 2 if(count == 2) 223 2 { 224 3 writeData('.'); 225 3 } 226 2 } 227 1 } 228 /**//*****************************DS18B20*******************************/ 229 230 void main() 231 { 232 1 uchar table[] = " xianzaiwendu: "; 233 1 sendChangeCmd(); 234 1 init(); 235 1 writeComm(0x80); 236 1 writeString(table, 16); 237 1 while(1) 238 1 { 239 2 delayMs(1000); //温度转换时间需要750ms以上 240 2 writeComm(0xc0); 241 2 display(getTmpValue()); C51 COMPILER V8.02 1602_WENDU 07/17/2010 10:42:44 PAGE 5 242 2 sendChangeCmd(); 243 2 } 244 1 } MODULE INFORMATION: STATIC OVERLAYABLE CODE SIZE = 724 ---- CONSTANT SIZE = 28 ---- XDATA SIZE = ---- ---- PDATA SIZE = ---- ---- DATA SIZE = ---- 35 IDATA SIZE = ---- ---- BIT SIZE = ---- 2 END OF MODULE INFORMATION. C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)