滚动码解码源程序和资料下载.doc

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

;------------------------------------------------------------------------------
; 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 Application 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 information or infringement of
; patents or other intellectual property arising from such use or
; otherwise.
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
; SIMPLE DECODER WITH ONE 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
; TABS: 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 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
;------------------------------------------------------------------------------
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).
;------------------------------------------------------------------------------

; 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 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

; COUNTER 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 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 WRITE
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
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 ; DISCRIMINATION 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 ; 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 ; EEPROM 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: 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

;****** STATUS 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

;------------------------------------------------------------------------------
; PAGE 0:
;------------------------------------------------------------------------------
ORG 00H

;------------------------------------------------------------------------------
;
; FUNCTION : RESET ()
;
; DESCRIPTION : 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 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 : 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 CSR3,F
RRF CSR2,F
RRF CSR1,F
RRF CSR0,F
RETLW 0

;------------------------------------------------------------------------------
;
; FUNCTION : TX_LOOKUP ()
;
; 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 ; ADDRESS 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 : UPDATE 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 ; TEST 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

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

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 *************
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 ()
;
; 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
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 ; 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 ; 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 ; WAIT 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

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

EEWRITE

; ******* 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 *********

WRITE1 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
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
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 COMMAND, 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

; ******* 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 )
RETLW 0H

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

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

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

; 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
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