滚动码解码源程序和资料下载.doc-资源下载-咨信网-让知识获取变得高效

滚动码解码源程序和资料下载.doc

1、 ; MICROCHIP KEELOQ CODE HOPPING SIMPLE DECODER ; ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ;

2、LEGAL NOTICE ; ; The information contained in this document is proprietary and ; confidential information of Microchip Technology Inc. Therefore all ; parties are required to sign a non-disclosure agreement before ; receiving this document. ; ; The information contained in this Appli

3、cation Note is for suggestion ; only. It is your responsibility to ensure that your application meets ; with your specifications. No representation or warranty is given and ; no liability is assumed by Microchip Technology Incorporated with ; respect to the accuracy or use of such info

4、rmation or infringement of ; patents or other intellectual property arising from such use or ; otherwise. ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; SIMPLE DECODER WITH O

5、NE STEP LEARN AND SINGLE KEY ;------------------------------------------------------------------------------ ; ;PROGRAM INFORMATION: FILE: SIMDEC11.ASM ; DATE: 8 SEPTEMBER 1998 ; VER.: 1.1 ; CKSM: XXXXH - FUSES:RC,WDT=ON,CP=ON ; ASM.: MPASM VERSION 2.13 USED ; INCL: NONE ; TA

6、BS: 8 ;------------------------------------------------------------------------------ ; CONFIGURATION CONTROL: ; ; -VERSION 1.1 S. DAWSON ; ; FILE: SIMDEC11.ASM. ; DATE: 8 SEPTEMBER 1998 ; VER.: 1.1 ; FUSES: RC,WDT=ON,CP=ON. ; ASM.: MPASM

7、 VERSION 2.13 USED. ; INCL: NONE ; ; CHANGES: ; 1. CODE HAS BECOME A RESERVED WORD IN MPASM - CHANGED IT TO DISC ; 2. ADDED DISCLAIMER ; ; ; DATE VERSION LINE CHANGES ; 08/14/96 1.0 FIRST VERSION ;----------------------------------------------------------------------------

8、 LIST P=16C54,R=DEC ;------------------------------------------------------------------------------ ;******USER DEFINITIONS****** MAX_USERS EQU 15 ; This is the maximum number of transmitters that the system is able to ; learn (1 to 15). ;------------------------------------------------

9、 ; GENERAL PURPOSE REGISTERS IND EQU 00H ; INDIRECT ADDRESS REGISTER RTCC EQU 01H ; REAL TIME COUNTER CLOCK PC EQU 02H ; PROGRAM COUNTER STATUS EQU 03H ; STATUS REGISTER FSR EQU 04H ; FILE SELECT REGISTER PORTA EQU 05H ; PORT A PORTB

10、 EQU 06H ; PORT B ; USER DEFINED REGISTER FLAGS EQU 07H ; USER FLAG REGISTER ADDRESS EQU 08H ; ADDRESS REGISTER TXNUM EQU 09H ; CURRENT TX OUTBYT EQU 0AH ; GENERAL DATA REGISTER MASK EQU OUTBYT ; MASK REGISTER USED IN DECRYPTION TMP_CNT EQU OUTBYT ; TEMPORARY COUNTER ; COUNT

11、ER REGISTERS CNT0 EQU 0BH ; LOOP COUNTERS CNT1 EQU 0CH CNT2 EQU 0DH CNT_HI EQU 0EH ; 16 BIT CLOCK COUNTER CNT_LW EQU 0FH ; CIRCULAR BUFFER REGISTER CSR0 EQU 10H ; 64 BIT RECEIVE SHIFT REGISTER CSR1 EQU 11H CSR2 EQU

12、 12H CSR3 EQU 13H CSR4 EQU 14H CSR5 EQU 15H CSR6 EQU 16H CSR7 EQU 17H ; TEMP REGISTERS TMP1 EQU 18H ; TEMP REGISTER FOR READ AND WRITE TMP2 EQU 19H ; TEMP REGISTER FOR READ AND WR

13、ITE REG EQU 1AH ; NOT USED REG1 EQU 1BH ; NOT USED KEY0 EQU 1CH ; 64 BIT KEY SHIFT REGISTER KEY1 EQU 1DH KEY2 EQU 1EH KEY3 EQU 1FH KEY4 EQU CNT2 KEY5 EQU CSR5 KEY6 EQU CSR6 KEY7 EQU CSR7 ; ***** USER REGISTER RE-MAPPINGS *************** HOP1 EQU CSR0 ; 32 BIT HOPCODE REGISTER

14、HOP2 EQU CSR1 HOP3 EQU CSR2 HOP4 EQU CSR3 ; RECEIVED TRANSMISSION OPEN 32 BITS SER_0 EQU CSR7 ; 28 BIT SERIAL NUMBER SER_1 EQU CSR6 SER_2 EQU CSR5 SER_3 EQU CSR4 ; RECEIVED TRANSMISSION ENCRYPTED 32 BITS FUNC EQU CSR3 ; BUTTON CODE & USER BIT FUNCTION BYTE DISC EQU CSR2 ; DISC

15、RIMINATION VALUE CNTR_HI EQU CSR1 ; 16 BIT RX COUNTER HIGH BYTE CNTR_LW EQU CSR0 ; 16 BIT RX COUNTER LOW BYTE ; ********* EEPROM MEMORY ******* LRNPTR EQU 01H ; LEARN POINTER ; ********* PORTA BIT DEFINITIONS ******* RES0 EQU 0H ; RESERVED PIN RFIN EQU 1H ; RF INPUT LRN EQU 2H ;

16、LEARN BUTTON LED EQU 3H ; LEARN INDICATOR LED OUTPUT - VALID SIGNAL ; ********* PORTB BIT DEFINITIONS ******* S0 EQU 0H ; S0 OUTPUT S1 EQU 1H ; S1 OUTPUT S2 EQU 2H ; S2 OUTPUT S3 EQU 3H ; S3 OUTPUT DIO EQU 4H ; EEPROM DATA LINE CLK EQU 5H ; EEPROM SERIAL CLOCK CS EQU 6H ; EEPR

17、OM CHIP SELECT RES1 EQU 7H ; RESERVED PIN ; ********* COMPILER DEFINES ****************** NBITS EQU 64 ; MAXIMUM TRANSMISSION BIT LENGTH MIN EQU 560 ; TRANSMISSION HEADER MINIMUM LENGTH [鍿] TRISA EQU 0111B ; PORTA: TRI-STATE VALUE WRCFG EQU 00000000B ; PORTB

18、 EEPROM WRITE TRI-STATE VALUE RDCFG EQU 00010000B ; PORTB: EEPROM READ TRI-STATE VALUE ;****** FLAGS DEFINITIONS ************** BITIN EQU 0H ; RF BIT VALUE LRNF EQU 1H ; LEARN FLAG SEC_CNT EQU 2H ; SECOND COUNTER IS BEING CHECKED RELEARN EQU 3H ; RELEARNING A TRANSMITTER ;****** STA

19、TUS REGISTER BIT DEFINITIONS ***************** C EQU 0 ; CARRY DC EQU 1 ; DIGIT CARRY Z EQU 2 ; ZERO PD EQU 3 ; POWER DOWN TO EQU 4 ; TIMEOUT PA0 EQU 5 ; NOT USED PA1 EQU 6 ; NOT USED ;--------------------

20、 ; PAGE 0: ;------------------------------------------------------------------------------ ORG 00H ;------------------------------------------------------------------------------ ; ; FUNCTION : RESET () ; ; DESCRIPTI

21、ON : PROGRAM RESET ROUTINE ; ;------------------------------------------------------------------------------ RESET MOVLW 000111B ; SETUP RTCC PRESCALER OPTION CLRF PORTA ; RESET PORTA CLRF PORTB ; RESET PORTB MOVLW TRISA ; SETUP PORTA TRIS PORTA MOVLW WRCFG ; SETUP

22、 PORTB TRIS PORTB CLRF FLAGS ; RESET FLAGS GOTO M_LOOP ; GOTO MAIN PROGRAM LOOP ;------------------------------------------------------------------------------ ; ; FUNCTION : ROT_SHIFT() ; ; DESCRIPTION : RIGHT ROTATE 64 BIT RECEIVE SHIFT REGISTER ; ; NOTE :

23、 THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;------------------------------------------------------------------------------ ROT_SHIFT RRF CSR7,F RRF CSR6,F RRF CSR5,F RRF CSR4,F RRF

24、 CSR3,F RRF CSR2,F RRF CSR1,F RRF CSR0,F RETLW 0 ;------------------------------------------------------------------------------ ; ; FUNCTION : TX_LOOKUP ()

25、 ; ; DESCRIPTION : TRANSMITTER ADDRESS CALCULATION ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;------------------------------------------------------------------------------ TX_LOOKUP MOVF TXNUM,W ; USE TRANSMITTER NUMBER TO CALCULATE MOVWF ADDRESS ; ADDRE

26、SS OF TRANSMITER BLOCK CLRC ; MULTIPLY BY 4 RLF ADDRESS,F RLF ADDRESS,F MOVLW 04H ; AND ADD 4 ADDWF ADDRESS,F RETLW 0 ; RETURN ;------------------------------------------------------------------------------ ; ; FUNCTION : TST_RTCC () ; ; DESCRIPTION : UPDA

27、TE RTCC COUNTER ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;------------------------------------------------------------------------------ TST_RTCC CLRWDT ; RESET WATCHDOG TIMER MOVLW TRISA ; UPDATE TRI-STATE REGISTER FOR PORTA TRIS PORTA BTFSS RTCC,7 ; T

28、EST FOR 32MS TIMEOUT ON RTCC MSB RETLW 0 ; ... DO QUICK RETURN TO RECEIVE ROUTINE ; **** INCREASE 16 BIT CLOCK TIMER ******* BCF RTCC,7 ; CLEAR MSB OF RTCC INCF CNT_LW,F ; INCREASE 16 COUNTER SKPNZ ; INCREASE UPPER BYTE IF ZERO ( OVERFLOW ) INCF CNT_HI,F RETLW 0 ;--------

29、 ; ; FUNCTION : TST_TIMER() ; ; DESCRIPTION : TEST 32MS TIMER AND UPDATE OUTPUTS IF REQUIRED ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;----------------------------------------------

30、 TST_TIMER ; ***** TEST FOR 500 MS TIMEMOUT ON OUTPUTS ********** BTFSS CNT_LW,4 ; TEST FOR 500 MS TIMEOUT GOTO TST_30 ; ... IF NOT TEST 30S TIMEOUT MOVLW 0F0H ANDWF PORTB,F ; DOWN ALL PULSE OUTPUTS ; ********* TEST FOR 30 S LEARN TIMEOUT *****

31、 TST_30 BTFSS FLAGS,LRNF GOTO TST_END BTFSC CNT_HI,2 ; TEST FOR LEARN TIMEOUT GOTO RESET ; ... IF LEARN TIMEMOUT FORCE SOFT RESET TST_END RETLW 0H ;------------------------------------------------------------------------------ ; ; FUNCTION : SENDC ()

32、 ; DESCRIPTION : SEND EEPROM COMMAND ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;------------------------------------------------------------------------------ SENDC CLRWDT ; RESET WATCHDOG TIMER BCF PORTB,CS ; RESET CS STATE

33、 BCF PORTB,CLK ; RESET CLK STATE BCF PORTB,DIO ; RESET DIO STATE MOVLW WRCFG TRIS PORTB ; DIO = OUTPUT GOTO $+1 ; WAIT FOR OUTPUTS TO SETTLE BSF PORTB,CS

34、 ; SELECT EEPROM SETC ; START BIT = 1 MOVLW 9D ; START BIT + 8 DATA BITS MOVWF CNT1 SENDC2 SKPC ; TEST BIT BCF PORTB,DIO ; WRITE TO DIO SKPNC

35、 ; TEST BIT BSF PORTB,DIO ; WRITE TO DIO GOTO $+1 ; WAIT 2 US RLF OUTBYT,F ; GET NEXT BIT INTO CARRY BSF PORTB,CLK ; CLOCK HIGH GOTO $+1 ; WAI

36、T 2 US GOTO $+1 ; WAIT 2 US BCF PORTB,CLK ; CLOCK LOW DECFSZ CNT1,F ; LOOP COUNTER GOTO SENDC2 BCF PORTB,DIO ; AVOID CONTENTION WITH READ RETLW 0 ;----------------------------------------

37、 ; ; FUNCTION : EEWRITE () ; ; DESCRIPTION : WRITE 16 BIT VALUE TO EEPROM ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;------------------------------------------------------------------------------ EEWRITE ; *

38、 EEPROM WRITE ENABLE ****************** WRITE0 MOVLW 30H ; WRITE ENABLE COMMAND MOVWF OUTBYT CALL SENDC ; SEND COMMAND TO EEPROM BCF PORTB,CS ; END COMMAND, DESELECT ; ******** WRITE 16-BIT WORD TO EEPROM ********* WRITE

39、1 MOVFW ADDRESS ; GET EEPROM ADDRESS MOVWF OUTBYT BSF OUTBYT,6 ; WRITE COMMAND CALL SENDC ; SEND COMMAND TO EEPROM MOVLW 16D ; 16 DATA BITS MOVWF CNT1 WRITE2 BTFSS TMP1,7 ; TEST MSB OF 16 BIT WORD

40、 BCF PORTB,DIO ; SET DATA BIT BTFSC TMP1,7 ; ... ELSE BSF PORTB,DIO ; CLEAR DATA BIT GOTO $+1 ; WAIT 2 US RLF TMP2,F ; SHIFT LO BYTE BSF PORTB,CLK ; CLOCK HIGH

41、 GOTO $+1 ; WAIT 2 US RLF TMP1,F ; SHIFT HI BYTE BCF PORTB,CLK ; CLOCK LOW DECFSZ CNT1,F GOTO WRITE2 ; LOOP COUNTER WAITACK BCF PORTB,CS ; END OF WRITE COMM

42、AND, DESELECT MOVLW RDCFG TRIS PORTB ; DIO = INPUT BSF PORTB,CS ; CS HIGH TO WAIT FOR ACK WRITE5 BTFSC PORTB,DIO ; CHECK FOR ACK GOTO WRITE6 ; WDT RESET ON NO ACK GOTO WRITE5 WRITE6 BCF PORTB,CS ; END OF ACK

43、 ; ******* EEPROM WRITE DISABLE **************** MOVLW 000H ; WRITE DISABLE COMMAND MOVWF OUTBYT CALL SENDC BCF PORTB,CS ; END OF DISABLE COMMAND, DESELECT INCF ADDRESS,F ; POINT TO NEXT EEPROM ADDRESS ( BY DEFAULT ) RETL

44、W 0H ;------------------------------------------------------------------------------ ; ; FUNCTION : EEREAD () ; ; DESCRIPTION : READ 16 BIT VALUE FROM EEPROM ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;-----------------------------------------------

45、 EEREAD MOVFW ADDRESS MOVWF OUTBYT BSF OUTBYT,7 ; COMMAND = READ CALL SENDC ; SEND COMMAND MOVLW RDCFG TRIS PORTB ; DIO = INPUT MOVLW 16D

46、 ; 16 BITS TO READ MOVWF CNT1 READ0 BSF PORTB,CLK ; CLOCK HIGH RLF TMP2,F ; SHIFT LO BYTE BCF TMP2,0 ; ASSUME BIT WILL BE 1 BTFSC PORTB,DIO ; READ DIO LINE BSF TMP2,0

47、 ; COPY BIT TO REGISTER BCF PORTB,CLK ; CLOCK LOW RLF TMP1,F ; SHIFT HI BYTE DECFSZ CNT1,F ; LOOP COUNTER GOTO READ0 BCF PORTB,CS ; END READ CYCLE RETLW 0H ;---------------------

48、 ; ; FUNCTION : DECRYPT () ; ; DESCRIPTION : DECRYPTS 32 BIT [HOP1:HOP4] USING [CSR0:CSR7] ; ; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE ; ;-------------------------------------------------------------

49、 ; THE KEY USED IS A FIXED KEY WHICH IS NOT SERIAL NUMBER DEPENDANT ; THE USER MUST CHOOSE A KEY AND CHANGE THE CODE HERE TO REFLECT THAT KEY DECRYPT MOVLW 0EFH ; LOAD FIXED 64 BIT KEY LSB MOVWF KEY0 MOVLW 0CDH MOVWF KEY1 MOVLW 0ABH MOVWF KEY2 MOVLW 089H

50、MOVWF KEY3 MOVLW 067H MOVWF KEY4 MOVLW 045H MOVWF KEY5 MOVLW 023H MOVWF KEY6 MOVLW 01H ; LOAD FIXED 64 BIT KEY MSB MOVWF KEY7 MOVLW 11+1 ; OUTER LOOP 11+1 TIMES MOVWF CNT1 ; OUTER LOOP 11+1 TIMES DECRYPT_OUTER MOVLW 48

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