📄 main.lst
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267
268 uchar Prepare_Addr( uchar addr )
269 {
270 1 *forward_ptr++ = (addr>>2);
271 1 *forward_ptr++ = (addr>>1);
272 1 *forward_ptr++ = addr;
273 1
274 1 return 3; //return number of emited bits
275 1 }
276
277 uchar Prepare_Data( uchar *data_tx)
278 {
279 1 register uchar i, j;
280 1 register uchar datas;
281 1 for(j=1; j<5; j++)
282 1 {
283 2 datas = *(data_tx + j);
284 2 for(i=8; i>0; i--)
285 2 {
286 3 *forward_ptr++ = (datas >> (i-1));
287 3 }
288 2 }
289 1 return 32; //return number of emited bits
290 1 }
291
292
293 // Forward Link setup function
294 // Requires: forwarLink_data filled with valid bits (1 bit per byte)
295 // fwd_bit_count set with number of bits to be sent
296 void SendForward(uchar fwd_bit_count)
297 {
298 1 uchar sync=1;
299 1 fwd_write_ptr = forwardLink_data;
300 1 fwd_bit_sz = fwd_bit_count;
301 1 fwd_bit_phase = 3;
302 1 field_stop = fwd_1st_pulse; //fwd_1st_pulse = 256-20
C51 COMPILER V7.50 MAIN 09/17/2007 14:50:28 PAGE 6
303 1
304 1 TR0=0;
305 1 TH0=0xff;TL0=1; //minimum startup pulse length，255
306 1 MOD=0;
307 1 TF0=0;
308 1 ET0=0; //disable T0 interrupt
309 1 TMOD=(TMOD|0x05); //计数器，16位计数器
310 1 TR0=1;
311 1
312 1 // waiting for clearing T0IE0 => command sending
313 1 while (!TF0)
314 1 {
315 2 if ((sync == 1) && (!DEMOD_OUT))
316 2 sync = 0;
317 2 if ((sync == 0) && (DEMOD_OUT))
318 2 break;
319 2 }
320 1 MOD=1; //force 1st mod pulse
321 1 fwd_bit_sz--; //prepare next bit modulation
322 1 fwd_write_ptr++;
323 1 TF0=0; //clear any pending flag
324 1 TR0=0;
325 1 TH0=0xFF;TL0= 255-60;
326 1 TR0=1;
327 1 field_stop = fwd_01_stop;
328 1 fwd_bit_phase = 2;
329 1 ET0=1; //enable overflow interrupt
330 1
331 1 // waiting for clearing T0IE0 => command sending
332 1 while ( ET0== 1 ) ;
333 1 }
334
335
336
337 //读卡程序， Manchester解码
338 void ManchesterRead(void)
339 {
340 1 uchar i,j;
341 1 uchar captured_bits_count;
342 1 //ClearCaptureBuffers();
343 1 captured_bit_count = 0;
344 1 capture_cnt = 0;
345 1 captured_byte=0;
346 1 capture_check=0;
347 1 capture_check_count=0;
348 1 buffer_capture_check=0;
349 1 compute_capture_check=0;
350 1 check_stat=0;
351 1
352 1
353 1
354 1 TR2 = 0;
355 1 TF2 = 0;
356 1 TL2 = 0;//(uchar)(~maxCaptureTimeLow); //0xd7
357 1 TH2 = 0;//(uchar)((~maxCaptureTimeLow)>>8); //0xf0, //set timer with initial time
358 1 currentMaxTimeHi = ~maxCaptureTimeHi; //0xff
359 1
360 1 last_capture = 0;//~maxCaptureTimeLow; //~0x0f28
361 1 capture_read_time_data_ptr = capture_time; // capture ptr
362 1
363 1 flag_wait=1;
364 1 ET2=1; //enable t2 interrupt
C51 COMPILER V7.50 MAIN 09/17/2007 14:50:28 PAGE 7
365 1
366 1 check_stat=ERR_EM4469_NEITHER_ACK; //if read card ok,check_stat will change
367 1
368 1 cap_count = 0;
369 1 TR2=1; //
370 1 while ( flag_wait ) //接收
371 1 {
372 2 for(i=0;i<0xf0;i++)
373 2 {
374 3 if(DEMOD_OUT == 0)
375 3 break;
376 3 }
377 2 if(i>=0xf0)
378 2 return;
379 2 capture(); //hi电平时间
380 2 cap_count++;
381 2 for(i=0;i<0xf0;i++)
382 2 {
383 3 if(DEMOD_OUT == 1)
384 3 break;
385 3 }
386 2 if(i>=0xf0)
387 2 return;
388 2 capture(); //low电平时间
389 2 cap_count++;
390 2 if(cap_count > 150)
391 2 break;
392 2 }
393 1 //capture_time[253]= cap_count;
394 1 //trace(capture_time,254);
395 1 check_stat=ERR_EM4469_NEITHER_ACK;
396 1 for(j=0;j<10;j++)
397 1 {
398 2 if(((halfDataRate*2+8)<capture_time[j])&&(capture_time[j]<(halfDataRate*3+8))
399 2 &&(capture_time[j+1]<MaxCaptureHalfDateRate)&&(capture_time[j+2]>MaxCaptureHalfDateRate)
400 2 &&(capture_time[j+2]<(halfDataRate*3+8)))
401 2 break;
402 2 }
403 1 if(j==10)
404 1 {
405 2 check_stat=0xf1;
406 2
407 2 return;
408 2 }
409 1 check_stat = UART_MESSAGE_OK;
410 1 if(capture_time[j+2]<(halfDataRate*2+8))
411 1 {
412 2 //bit_begin = 1;
413 2 store_bit(0);
414 2 b_edge = 0;
415 2 j=j+4;
416 2 }
417 1 else if((capture_time[j+2]>(halfDataRate*2+8))&&(capture_time[j+2]<(halfDataRate*3+8)))
418 1 {
419 2 //bit_begin = 0;
420 2 store_bit(1);
421 2 b_edge = 1;
422 2 j=j+3;
423 2 }
424 1 else
425 1 {
426 2 check_stat=0xf2;
C51 COMPILER V7.50 MAIN 09/17/2007 14:50:28 PAGE 8
427 2 return;
428 2 }
429 1
430 1 captured_bits_count=1;
431 1 captured_bits_count++;
432 1 if (check_stat==UART_MESSAGE_OK)
433 1 {
434 2 //解码
435 2 for (i=0;i<150;i++)
436 2 {
437 3 if (capture_time[j]<MaxCaptureHalfDateRate)
438 3 {
439 4 if((i%2)==0)
440 4 {
441 5 store_bit(b_edge);
442 5 }
443 4 else
444 4 {
445 5 store_bit(!b_edge);
446 5 }
447 4 i++;
448 4 j++;
449 4 captured_bits_count++;
450 4 if (captured_bits_count>64) //32位数据结构
451 4 break;
452 4 }
453 3 else if((capture_time[j]>MaxCaptureHalfDateRate) &&(capture_time[j]<MaxCaptureDateRate))
454 3 {
455 4 if((i%2)==0)
456 4 {
457 5 store_bit(!b_edge);
458 5 }
459 4 else
460 4 {
461 5 store_bit(b_edge);
462 5 }
463 4 captured_bits_count++;
464 4 if (captured_bits_count>64) //45位数据结构
465 4 break;
466 4 }
467 3 else
468 3 {
469 4 check_stat=0xf3;
470 4 break;
471 4 }
472 3 j++;
473 3 }
474 2 }
475 1 for(i=0;i<150;i++) //2006-5-13 14:19
476 1 {
477 2 capture_time[i]=0xff;
478 2 }
479 1
480 1 //trace(capture_time,120);
481 1 //trace(capture_data,32);
482 1
483 1 }
484
485 //写卡程序，Manchester解码
486 void ManchesterWrite(void)
487 {
488 1 uchar i,j;
C51 COMPILER V7.50 MAIN 09/17/2007 14:50:28 PAGE 9
489 1 ClearCaptureBuffers();
490 1 captured_bit_count = 0;
491 1 capture_cnt = 0;
492 1 captured_byte=0;
493 1 capture_check=0;
494 1 capture_check_count=0;
495 1 buffer_capture_check=0;
496 1 compute_capture_check=0;
497 1 check_stat=0;
498 1 TR2 = 0;
499 1 TF2=0; //clear pending interrupts
500 1 TL2=(uchar)(~maxCaptureTimeLow); TH2=(uchar)((~maxCaptureTimeLow)>>8) ; //set timer with init
-ial time
501 1 currentMaxTimeHi = ~maxCaptureTimeHi;
502 1 last_capture=~maxCaptureTimeLow;
503 1 capture_read_time_data_ptr=capture_time;
504 1 flag_wait=1;ET2=1;
505 1
506 1
507 1
508 1 TR2=1;
509 1 while ( flag_wait )
510 1 {
511 2 for(i=0;i<0xf0;i++)
512 2 {
513 3 if(DEMOD_OUT == 0) //等待低电平，超时退出
514 3 break;
515 3 }
516 2 if(i>=0xf0)
517 2 {
518 3 for(i=0;i<120;i++)
519 3 {
520 4 capture_time[i]=0xff;
521 4 }
522 3 return;
523 3 }
524 2
525 2 capture();
526 2
527 2 for(i=0;i<0xf0;i++)
528 2 {
529 3 if(DEMOD_OUT == 1) //等待高电平，超时退出
530 3 break;
531 3 }
532 2 if(i>=0xf0)
533 2 {
534 3 for(i=0;i<120;i++)
535 3 {
536 4 capture_time[i]=0xff;
537 4 }
538 3 return;
539 3 }
540 2
541 2 capture();
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