📄 search.lst
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175 // FIND DEVICES
176 void FindDevices(void)
177 {
178 1 unsigned char m;
179 1 unsigned char number;
C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 4
180 1 number =0;
181 1 if(!OWReset()) //Begins when a presence is detected
182 1 {
183 2 if(First()) //Begins when at least one part is found
184 2 {
185 3 numROMs=0;
186 3 do
187 3 {
188 4 numROMs++;
189 4 for(m=0;m<8;m++)
190 4 {
191 5 FoundROM[number][m]=ROM[m]; //Identifies ROM
192 5 //number on found device
193 5 }
194 4 number++;
195 4 if(number==1)
196 4 {
197 5 send_rom_flg=1;
198 5 EA =1;
199 5 IE0 =1; //启动外部中断0，将10个DS18B20 ID转移到外部ROM
200 5 number=0;
201 5 }
202 4
203 4 }while (Next()&&(numROMs<70)); //Continues until no additional devices are found
204 3 }
205 2 }
206 1 }
207
208
209
210 // The Next function searches for the next device on the 1-wire bus. If
211 // there are no more devices on the 1-wire then false is returned.
212 //
213 unsigned char Next_sub(void)
214 {
215 1 unsigned char m = 1; // ROM Bit index
216 1 unsigned char n = 0; // ROM Byte index
217 1 unsigned char k = 1; // bit mask
218 1 unsigned char x = 0;
219 1 unsigned char discrepMarker = 0; // discrepancy marker
220 1 unsigned char g; // Output bit
221 1 unsigned char nxt; // return value
222 1 bit data flag;
223 1
224 1 nxt = FALSE; // set the next flag to false
225 1 //dowcrc = 0; // reset the dowcrc
226 1 flag = OWReset(); // reset the 1-wire
227 1
228 1 if(flag||doneFlag) // no parts -> return false
229 1 {
230 2 lastDiscrep = 0; // reset the search
231 2 return FALSE;
232 2 }
233 1 OWWriteByte(0xEC); // send SearchROM command
234 1 do
235 1 // for all eight bytes
236 1 {
237 2 x = 0;
238 2 if(OWReadBit()==1) x = 2;
239 2 delay(6);
240 2 if(OWReadBit()==1) x |= 1; // and its complement
241 2 if(x ==3) // there are no devices on the 1-wire
C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 5
242 2 break;
243 2 else
244 2 {
245 3 if(x>0) // all devices coupled have 0 or 1
246 3 g = x>>1; // bit write value for search
247 3 else
248 3 {
249 4 // if this discrepancy is before the last
250 4 // discrepancy on a previous Next then pick
251 4 // the same as last time
252 4 if(m<lastDiscrep)
253 4 g = ((ROM[n]&k)>0);
254 4 else // if equal to last pick 1
255 4 g = (m==lastDiscrep); // if not then pick 0
256 4 // if 0 was picked then record
257 4 // position with mask k
258 4 if (g==0) discrepMarker = m;
259 4 }
260 3 if(g==1) // isolate bit in ROM[n] with mask k
261 3 ROM[n] |= k;
262 3 else
263 3 ROM[n] &= ~k;
264 3 OWWriteBit(g); // ROM search write
265 3 m++; // increment bit counter m
266 3 k = k<<1; // and shift the bit mask k
267 3 if(k==0) // if the mask is 0 then go to new ROM
268 3 { // byte n and reset mask
269 4 // OWCrc(ROM[n]); // accumulate the CRC
270 4 n++; k++;
271 4 }
272 3 }
273 2 }while(n<8); //loop until through all ROM bytes 0-7
274 1
275 1 // if(m<65||dowcrc) // if search was unsuccessful then
276 1 if(m<65)
277 1 lastDiscrep=0; // reset the last discrepancy to 0
278 1 else
279 1 {
280 2 // search was successful, so set lastDiscrep,
281 2 // lastOne, nxt
282 2 lastDiscrep = discrepMarker;
283 2 doneFlag = (lastDiscrep==0);
284 2 nxt = TRUE; // indicates search is not complete yet, more
285 2 // parts remain
286 2 }
287 1 return nxt;
288 1 }
289
290
291 // FIRST
292 // The First function resets the current state of a ROM search and calls
293 // Next to find the first device on the 1-wire bus.
294 //
295 unsigned char First_sub(void)
296 {
297 1 lastDiscrep = 0; // reset the rom search last discrepancy global
298 1 doneFlag = FALSE;
299 1 return Next_sub(); // call Next and return its return value
300 1 }
301
302
303
C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 6
304
305
306 void FindDevices_sub(void)
307 {
308 1 unsigned char m;
309 1 unsigned char number;
310 1 number =0;
311 1 if(!OWReset()) //Begins when a presence is detected
312 1 {
313 2 if(First_sub()) //Begins when at least one part is found
314 2 {
315 3 numROMs=0;
316 3 do
317 3 {
318 4 numROMs++;
319 4 number++;
320 4 for(m=0;m<8;m++)
321 4 {
322 5 FoundROM[number][m]=ROM[m]; //Identifies ROM
323 5 //number on found device
324 5 }
325 4 if(number==1)
326 4 {
327 5 send_rom_flg=1;
328 5 IE0=1; //启动外部中断0，将10个DS18B20 ID转移到外部ROM
329 5 number=0;
330 5 }
331 4
332 4 }while (Next_sub()&&(numROMs<70)); //Continues until no additional devices are found
333 3 }
334 2 }
335 1 }
336
337
338
339
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 635 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 19 16
IDATA SIZE = ---- ----
BIT SIZE = ---- 2
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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