?? ledtest.lst
字號(hào):
693 {uchar owireda;
694 1 owireda=readowdatabit();
695 1 /* if (owireda ==0xff)
696 1 {
697 1 tx_str("read one bit program error!");
698 1 }
699 1 if (owireda ==0x00)
700 1 {
701 1 tx_str("read one bit==0x00!");
702 1 }
703 1 if (owireda ==0x01)
704 1 {
705 1 tx_str("read one bit==0x01!");
706 1 }
707 1 if ((owireda !=0x01)&&(owireda !=0x00)&&(owireda !=0xff))
708 1 {
709 1 tx_str("read one bit program error !=0x01,0x00,0xff!");
710 1 }*/
711 1 return(owireda);
712 1 }
713
714
715 void wdelay(int us)
716 {
717 1 int s;
718 1 for (s=0;s<us;s++);
719 1 }
720 //////////////////////////////////////////////////////////////////////////////
721 // OW_RESET - performs a reset on the one-wire bus and
722 // returns the presence detect. Reset is 480us, so delay
723 // value is (480-24)/16 = 28.5 - we use 29. Presence checked
724 // another 70us later, so delay is (70-24)/16 = 2.875 - we use 3.
725 //
726 /*unsigned char ow_reset(void)
727 {
728 unsigned char presence;
729 owData = 0; //pull DQ line low
730 wdelay(29); // leave it low for 480us
731 owData = 1; // allow line to return high
732 wdelay(3); // wait for presence
733 presence = owData; // get presence signal
734 wdelay(25); // wait for end of timeslot
735 return(presence); // presence signal returned
736 } // 0=presence, 1 = no part*/
737
C51 COMPILER V7.01 LEDTEST 08/21/2002 17:11:51 PAGE 13
738 //////////////////////////////////////////////////////////////////////////////
739 // READ_BYTE - reads a byte from the one-wire bus.
740 //
741 unsigned char read_byte(void)
742 {
743 1 unsigned char i;
744 1 unsigned char value = 0;
745 1 for (i=0;i<8;i++)
746 1 {
747 2 if(read_bit()) value|=0x01<<i; // reads byte in, one byte at a time and then
748 2 // shifts it left
749 2 wdelay(6); // wait for rest of timeslot
750 2 }
751 1 return(value);
752 1 }
753
754 unsigned char First(uchar conditional)
755 {int flag;
756 1 unsigned char g; // Output bit
757 1 unsigned char x = 0;
758 1 unsigned char m = 1; // ROM Bit index
759 1 unsigned char n = 0; // ROM Byte index
760 1 unsigned char k = 1; // bit mask
761 1 unsigned char discrepMarker = 0; // discrepancy marker
762 1 unsigned char nxt; // return value
763 1
764 1 LastDeviceFlag = FALSE;
765 1 LastDiscrepancy = 0;
766 1
767 1 nxt = FALSE; // set the next flag to false
768 1 crc8=0;
769 1
770 1 flag = ow_reset();
771 1
772 1 if(flag||LastDeviceFlag) // no parts -> return false
773 1 {
774 2 LastDiscrepancy = 0; // reset the search
775 2 return FALSE;
776 2 }
777 1 if (conditional)
778 1 { write_byte(0xec);
779 2 }
780 1 else{
781 2 write_byte(0xF0);
782 2 }
783 1 do
784 1 // for all eight bytes
785 1 {
786 2 x = 0;
787 2 /* if(read_bit==0xff)
788 2 {
789 2 tx_str("read one bit program error!");
790 2 }*/
791 2 if(read_bit()==1)
792 2 {
793 3 x = 2;
794 3 // tx_str(" first bit=1!");
795 3 // tx_lfbs();
796 3 }
797 2 wdelay(6);
798 2 if(read_bit()==1)
799 2 {x |= 1; // and its complement
C51 COMPILER V7.01 LEDTEST 08/21/2002 17:11:51 PAGE 14
800 3 // tx_str(" next bit=1!");
801 3 //tx_lfbs();
802 3 }
803 2 if(x ==3) // there are no devices on the 1-wire
804 2 {
805 3 tx_str(" not find slave device!");
806 3 tx_lfbs();
807 3 break;
808 3 }
809 2 else
810 2 {
811 3 if(x>0) // all devices coupled have 0 or 1
812 3 g = x>>1; // bit write value for search
813 3 else
814 3 {
815 4 // if this discrepancy is before the last
816 4 // discrepancy on a previous Next then pick
817 4 // the same as last time
818 4 if(m<LastDiscrepancy)
819 4 {
820 5 g = ((ROM_NO[n]&k)>0);
821 5 }
822 4 else // if equal to last pick 1
823 4 {
824 5 g = (m==LastDiscrepancy); // if not then pick 0
825 5 }
826 4 // if 0 was picked then record
827 4 // position with mask k
828 4 if (g==0) discrepMarker = m;
829 4 }
830 3 if(g==1) // isolate bit in ROM[n] with mask k
831 3 ROM_NO[n] |= k;
832 3 else
833 3 ROM_NO[n] &= ~k;
834 3 write_bit(g); // ROM search write
835 3 m++; // increment bit counter m
836 3 k = k<<1; // and shift the bit mask k
837 3 if(k==0) // if the mask is 0 then go to new ROM
838 3 { // byte n and reset mask
839 4 crc8=docrc8(ROM_NO[n],crc8); // accumulate the CRC
840 4 n++; k++;
841 4 }
842 3 }
843 2 }while(n<8); //loop until through all ROM bytes 0-7
844 1 if(m<65||crc8) // if search was unsuccessful then
845 1 LastDiscrepancy=0; // reset the last discrepancy to 0
846 1 else
847 1 {
848 2 // search was successful, so set lastDiscrep,
849 2 // lastOne, nxt
850 2 LastDiscrepancy = discrepMarker;
851 2 LastDeviceFlag = (LastDiscrepancy==0);
852 2 nxt = TRUE; // indicates search is not complete yet, more
853 2 tx_str("Find Device!");
854 2 tx_lfbs();
855 2 // parts remain
856 2 }
857 1 return nxt;
858 1 }
859 // Perform Match ROM
860 //
861 unsigned char Send_MatchRom(void)
C51 COMPILER V7.01 LEDTEST 08/21/2002 17:11:51 PAGE 15
862 {
863 1 unsigned char i;
864 1 if(ow_reset())
865 1 {
866 2 tx_str("owire reset failure!");
867 2 return FALSE;
868 2 }
869 1 write_byte(0x55); // match ROM command
870 1 for(i=0;i<8;i++)
871 1 {
872 2 write_byte(ROM_NO[i]); //send ROM code
873 2 }
874 1 return TRUE;
875 1 }
876
877 //--------------------------------------------------------------------------
878 // Reset crc16 to the value passed in
879 //
880 // 'reset' - data to set crc16 to.
881 //
882 void setcrc16(ushort reset)
883 {
884 1 utilcrc16 = reset;
885 1 return;
886 1 }
887 //--------------------------------------------------------------------------
888 // Calculate a new CRC16 from the input data short. Return the current
889 // CRC16 and also update the global variable CRC16.
890 //
891 // 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
892 // indicate the symbolic port number.
893 // 'data' - data to perform a CRC16 on
894 //
895 // Returns: the current CRC16
896 //
897 ushort docrc16(ushort cdata)
898 {
899 1 cdata = (cdata ^ (utilcrc16 & 0xff)) & 0xff;
900 1 utilcrc16 >>= 8;
901 1
902 1 if (oddparity[cdata & 0xf] ^ oddparity[cdata >> 4])
903 1 utilcrc16 ^= 0xc001;
904 1
905 1 cdata <<= 6;
906 1 utilcrc16 ^= cdata;
907 1 cdata <<= 1;
908 1 utilcrc16 ^= cdata;
909 1
910 1 return utilcrc16;
911 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1119 ----
CONSTANT SIZE = 58 ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 53 29
IDATA SIZE = ---- ----
BIT SIZE = 1 ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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