?? mfrc500uc.lst
字號(hào):
451 byteOffset = 0;
452 if ( nbits != 0 ) // last byte was not complete
453 {
454 snr_in[nbytes - 1] = snr_in[nbytes - 1] | MRcvBuffer[0];
455 byteOffset = 1;
456 }
457 for ( i =0; i < (4 - nbytes); i++)
458 {
459 snr_in[nbytes + i] = MRcvBuffer[i + byteOffset];
460 }
461
462 if (status != MI_COLLERR ) // no error and no collision
463 {
464 // SerCh check
465 snr_crc = snr_in[0] ^ snr_in[1] ^ snr_in[2] ^ snr_in[3];
466 snr_check = MRcvBuffer[MInfo.nBytesReceived - 1];
467 if (snr_crc != snr_check)
468 {
469 status = MI_SERNRERR;
470 }
471 else
472 {
473 complete = 1;
474 }
475 }
476 else // collision occured
477 {
478 bcnt = bcnt + MInfo.collPos - nbits;
479 status = MI_OK;
480 }
481 }
482 }
C51 COMPILER V6.12 MFRC500UC 08/18/2008 15:29:35 PAGE 9
483 }
484 }
485 if (status == MI_OK)
486 {
487 // transfer snr_in to snr
488 memcpy(snr,snr_in,4);
489 }
490 else
491 {
492 memcpy(snr,"0000",4);
493 }
494
495 //----------------------Einstellungen aus Initialisierung ruecksetzen
496 ClearBitMask(RegDecoderControl,0x20); // ZeroAfterColl disable
497
498 return status;
499 }
500
501 ///////////////////////////////////////////////////////////////////////
502 // M I F A R E S E L E C T
503 // for std. select
504 ///////////////////////////////////////////////////////////////////////
505 char Mf500PiccSelect(unsigned char *snr,
506 unsigned char *sak)
507 {
508 return Mf500PiccCascSelect(0x93,snr,sak); // first cascade level
509 }
510
511 ///////////////////////////////////////////////////////////////////////
512 // M I F A R E C A S C A D E D S E L E C T
513 // for extended serial number
514 ///////////////////////////////////////////////////////////////////////
515 char Mf500PiccCascSelect(unsigned char select_code,
516 unsigned char *snr,
517 unsigned char *sak)
518 {
519 char status = MI_OK;
520
521 if ((status = Mf500PcdSetDefaultAttrib()) == MI_OK)
522 {
523 PcdSetTmo(106);
524
525 WriteRC(RegChannelRedundancy,0x0F); // RxCRC,TxCRC, Parity enable
526 ClearBitMask(RegControl,0x08); // disable crypto 1 unit
527
528 //************* Cmd Sequence **********************************
529 ResetInfo(MInfo);
530 MSndBuffer[0] = select_code;
531 MSndBuffer[1] = 0x70; // number of bytes send
532
533 memcpy(MSndBuffer + 2,snr,4);
534 MSndBuffer[6] = MSndBuffer[2]
535 ^ MSndBuffer[3]
536 ^ MSndBuffer[4]
537 ^ MSndBuffer[5];
538 MInfo.nBytesToSend = 7;
539 status = PcdSingleResponseCmd(PCD_TRANSCEIVE,
540 MSndBuffer,
541 MRcvBuffer,
542 &MInfo);
543
544 *sak = 0;
C51 COMPILER V6.12 MFRC500UC 08/18/2008 15:29:35 PAGE 10
545 if (status == MI_OK) // no timeout occured
546 {
547 if (MInfo.nBitsReceived != 8) // last byte is not complete
548 {
549 status = MI_BITCOUNTERR;
550 }
551 else
552 {
553 *sak = MRcvBuffer[0];
554 memcpy(MLastSelectedSnr,snr,4);
555 }
556 }
557 }
558 return status;
559 }
560
561 ///////////////////////////////////////////////////////////////////////
562 // M I F A R E P I C C A C T I V A T I O N S E Q E N C E
563 ///////////////////////////////////////////////////////////////////////
564 char Mf500PiccActivateIdle(unsigned char br,
565 unsigned char *atq,
566 unsigned char *sak,
567 unsigned char *uid,
568 unsigned char *uid_len)
569 {
570 unsigned char cascade_level;
571 unsigned char sel_code;
572 unsigned char uid_index;
573 signed char status;
574 unsigned char cmdASEL;
575
576 *uid_len = 0;
577
578 //call activation with def. divs
579 status = Mf500PcdSetDefaultAttrib();
580 if (status == MI_OK)
581 {
582 status = Mf500PiccCommonRequest(PICC_REQIDL,atq);
583 }
584 if (status == MI_OK)
585 {
586 if((atq[0] & 0x1F) == 0x00) // check lower 5 bits, for tag-type
587 // all tags within this 5 bits have to
588 // provide a bitwise anticollision
589 {
590 status = MI_NOBITWISEANTICOLL;
591 }
592 }
593 if (status == MI_OK)
594 {
595 //Get UID in 1 - 3 levels (standard, [double], [triple] )
596 //-------
597 switch(br)
598 {
599 case 0: cmdASEL = PICC_ANTICOLL1; break;
600 default:
601 status = MI_BAUDRATE_NOT_SUPPORTED; break;
602 }
603 }
604 if (status == MI_OK)
605 {
606 cascade_level = 0;
C51 COMPILER V6.12 MFRC500UC 08/18/2008 15:29:35 PAGE 11
607 uid_index = 0;
608 do
609 {
610 //Select code depends on cascade level
611 sel_code = cmdASEL + (2 * cascade_level);
612 cmdASEL = PICC_ANTICOLL1; // reset anticollistion level for calculation
613 //ANTICOLLISION
614 status = Mf500PiccCascAnticoll(sel_code, 0, &uid[uid_index]);
615 //SELECT
616 if (status == MI_OK)
617 {
618 status = Mf500PiccCascSelect(sel_code, &uid[uid_index], sak);
619 if (status == MI_OK)
620 {
621 cascade_level++;
622
623 //we differ cascaded and uncascaded UIDs
624 if (*sak & 0x04) // if cascaded, bit 2 is set in answer to select
625 {
626 //this UID is cascaded, remove the cascaded tag that is
627 //0x88 as first of the 4 byte received
628 memmove(&uid[uid_index], &uid[uid_index + 1], 3);
629 uid_index += 3;
630 *uid_len += 3;
631 }
632 else
633 {
634 //this UID is not cascaded -> the length is 4 bytes
635 uid_index += 4;
636 *uid_len += 4;
637 }
638 }
639 }
640 }
641 while((status == MI_OK) // error status
642 && (*sak & 0x04) // no further cascade level
643 && (cascade_level < 3)); // highest cascade level is reached
644 }
645 if (status == MI_OK)
646 {
647 //Exit function, if cascade level is triple and sak indicates another
648 //cascase level.
649 if ((cascade_level == 3) && (*sak & 0x04))
650 {
651 *uid_len = 0;
652 status = MI_SERNRERR;
653 }
654 }
655 return (status);
656 }
657
658 ///////////////////////////////////////////////////////////////////////
659 // M I F A R E P I C C A C T I V A T I O N S E Q E N C E
660 ///////////////////////////////////////////////////////////////////////
661 char Mf500PiccActivateWakeup(unsigned char br,
662 unsigned char *atq,
663 unsigned char *sak,
664 unsigned char *uid,
665 unsigned char uid_len)
666 {
667 unsigned char cascade_level;
668 unsigned char uid_index;
C51 COMPILER V6.12 MFRC500UC 08/18/2008 15:29:35 PAGE 12
669 unsigned char tmpuid[4];
670 unsigned char sel_code;
671 unsigned char cmdASEL;
672 signed char status;
673
674 //call activation with def. divs
675 status = Mf500PcdSetDefaultAttrib();
676 if (status == MI_OK)
677 {
678 status = Mf500PiccCommonRequest(PICC_REQIDL,atq);
679 }
680 if (status == MI_OK)
681 {
682 if ((atq[0] & 0x1F) == 0x00) // check lower 5 bits, for tag-type
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