📄 ds1820.lst
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202 1 printf("%X%X%X%X%X%X%X%X \n", //输出ROM序列号
203 1 dat[7],dat[6],dat[5],dat[4],dat[3],dat[2],dat[1],dat[0]);
204 1 }
205
206 uchar CRCCheck( uchar x)
207 {
208 1 uchar code dsc[] = //CRC校验表
209 1 {
210 1 0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
211 1 157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
212 1 35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
213 1 190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
214 1 70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
215 1 219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
216 1 101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
217 1 248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
218 1 140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
219 1 17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
220 1 175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
221 1 50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
222 1 202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
223 1 87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
224 1 233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
225 1 116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53
226 1 };
227 1
228 1 CRCdsc = dsc[CRCdsc^x]; //查表校验
229 1 return CRCdsc; //返回
230 1 }
231
232 uchar SearchDevice(uchar EndFlag, uchar LastData)
233 {
234 1 uchar m = 1; //DS18S20 ROM 位索引
235 1 uchar n = 0; //DS18S20 ROM 字节索引
236 1 uchar k = 1;
237 1 uchar x = 0;
238 1 uchar disMarker = 0;
239 1 uchar g;
240 1 uchar nxt;
241 1 int flag;
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 5
242 1 nxt =0; //初始化
243 1 CRCdsc = 0;
244 1 flag = Reset(); //复位函数
245 1 if(flag||EndFlag) //如果没有其它器件
246 1 {
247 2 LastData = 0;
248 2 return 0; //返回0
249 2 }
250 1 WriteByte(0xF0); //搜索ROM 命令
251 1 do //循环
252 1 {
253 2 x = 0;
254 2 if(ReadBit()==1)
255 2 x = 2;
256 2 Delay(1);
257 2 if(ReadBit()==1)
258 2 x |= 1;
259 2 if(x ==3)
260 2 break;
261 2 else
262 2 {
263 3 if(x>0)
264 3 g = x>>1;
265 3 else
266 3 {
267 4 if(m<LastData)
268 4 g = ((DS18S20ROM[n]&k)>0);
269 4 else
270 4 g = (m==LastData);
271 4 if (g==0)
272 4 disMarker = m;
273 4 }
274 3 if(g==1)
275 3 DS18S20ROM[n] |= k;
276 3 else
277 3 DS18S20ROM[n] &= ~k;
278 3 WriteBit(g); //位写入函数
279 3 m++;
280 3 k = k<<1;
281 3 if(k==0)
282 3 {
283 4 CRCCheck(DS18S20ROM[n]); //CRC校验
284 4 n++;
285 4 k++;
286 4 }
287 3 }
288 2 }while(n<8); //直到全部ROM字节0～7都完成
289 1 if(m<65||CRCdsc)
290 1 LastData=0;
291 1 else //搜索成功
292 1 {
293 2 LastData = disMarker; //置位LastData, lastOne和nxt
294 2 EndFlag = (LastData==0);
295 2 nxt = 1; //表示总线上还有其它器件，搜索未结束
296 2 }
297 1 return nxt;
298 1 }
299
300 uchar FindFirstDevice(void)
301 {
302 1 uchar LastData = 0;
303 1 uchar EndFlag = 0;
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 6
304 1 return SearchDevice(EndFlag,LastData); //搜索器件函数SearchDevice
305 1 }
306
307 void ReadData(void)
308 {
309 1 int j;
310 1 char pad[10];
311 1 printf("\nReading DS18S20 ScratchPad Data\n");
312 1 WriteByte(0xBE); //读暂存器命令（代码为BEH）
313 1 for (j=0;j<9;j++) //循环读取暂存器中9个字节的数据
314 1 {
315 2 pad[j]=ReadByte(); //字节读取函数
316 2 }
317 1 printf("\n ScratchPAD DATA =");
318 1 printf("\n%X%X%X%X%X%X%X%X%X \n", //输出结果
319 1 pad[8],pad[7],pad[6],pad[5],pad[4],pad[3],pad[2],pad[1],pad[0]);
320 1 }
321
322 void FindDevices(void)
323 {
324 1 uchar numROMs;
325 1 uchar m;
326 1 uchar LastData = 0;
327 1 uchar EndFlag = 0;
328 1 numROMs=0;
329 1
330 1 if(!Reset()) //复位总线
331 1 { //如果存在器件则开始处理
332 2 if(FindFirstDevice()) //调用FindFirstDevice函数
333 2 {
334 3 do //循环
335 3 {
336 4 numROMs++;
337 4 for(m=0;m<8;m++)
338 4 { //识别ROM代码
339 5 ROMFound[numROMs][m]=DS18S20ROM[m];
340 5 }
341 4 printf("\nDS18S20 ROM CODE = ");
342 4 printf("\n%02X%02X%02X%02X%02X%02X%02X%02X \n",
343 4 ROMFound[5][7],ROMFound[5][6],ROMFound[5][5],ROMFound[5][4],
344 4 ROMFound[5][3],ROMFound[5][2],ROMFound[5][1],ROMFound[5][0]);
345 4 }while (SearchDevice(EndFlag,LastData)&&(numROMs<10));
346 3 //直到没有发现其它从器件
347 3 }
348 2 }
349 1 }
350
351
352 void ReadTemperature(void)
353 {
354 1 char get[10];
355 1 char temp_lsb,temp_msb;
356 1 int k;
357 1 char Ftemperature,Ctemperature;
358 1 Reset(); //复位
359 1 WriteByte(0xCC); //跳过ROM序列号命令
360 1 WriteByte(0x44); //启动温度转换命令
361 1 Delay(1);
362 1 Reset();
363 1 WriteByte(0xCC); //跳过ROM序列号命令
364 1 WriteByte(0xBE); //读暂存器指令
365 1 for (k=0;k<9;k++)
C51 COMPILER V8.08 DS1820 08/29/2008 11:02:01 PAGE 7
366 1 {
367 2 get[k]=ReadByte(); //循环读取
368 2 }
369 1 printf("\n Scratch DATA = %X%X%X%X%X%X%X%X%X \n",
370 1 get[8],get[7],get[6],get[5],get[4],get[3],get[2],get[1],get[0]);
371 1 temp_msb = get[1];
372 1 temp_lsb = get[0];
373 1 if (temp_msb <= 0x80)
374 1 {
375 2 temp_lsb = (temp_lsb/2); //移位，得到完整的温度值
376 2 }
377 1 temp_msb = temp_msb & 0x80; //屏蔽符号位之外的所有数据位
378 1 if (temp_msb >= 0x80)
379 1 {
380 2 temp_lsb = (~temp_lsb)+1; // temp_lsb取补，再加1
381 2 }
382 1 if (temp_msb >= 0x80)
383 1 {
384 2 temp_lsb = (temp_lsb/2); //移位，得到完整的温度值
385 2 }
386 1 if (temp_msb >= 0x80)
387 1 {
388 2 temp_lsb = ((-1)*temp_lsb); //符号位
389 2 }
390 1 printf( "\nTempC= %d degrees C\n", (int)temp_lsb );//摄氏温度值输出
391 1 Ctemperature = temp_lsb;
392 1 Ftemperature = (((int) Ctemperature)* 9)/5 + 32;
393 1 printf( "\nTempF= %d degrees F\n", (int)Ftemperature );//华氏温度值输出
394 1 }
395
396
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1370 ----
CONSTANT SIZE = 1360 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 49 47
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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