|
;------------------------------------------------------------------------------
; 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 ; INNER LOOP 48 TIMES
MOVWF CNT0 ; INNER LOOP 48 TIMES DECRYPT_INNER
CLRWDT ; RESET WATCHDOG TIMER
MOVFW CNT1 ; LAST 48 LOOPS RESTORE THE KEY
XORLW 1 ; LAST 48 LOOPS RESTORE THE KEY
SKPNZ ; LAST 48 LOOPS RESTORE THE KEY
GOTO ROTATE_KEY ; LAST 48 LOOPS RESTORE THE KEY ; THE LOOKUP TABLE IS COMPRESSED INTO IN 4 BYTES TO SAVE SPACE
; USE THE 3 LOW INDEX BITS TO MAKE UP AN 8-BIT BIT MASK
; USE THE 2 HIGH INDEX BITS TO LOOK UP THE VALUE IN THE TABLE
; USE THE BIT MASK TO ISOLATE THE CORRECT BIT IN THE BYTE
; PART OF THE REASON FOR THIS SCHEME IS BECAUSE NORMAL TABLE LOOKUP
; REQUIRES AN ADDITIONAL STACK LEVEL CLRC ; CLEAR CARRY (FOR THE LEFT SHIFT)
MOVLW 1 ; INITIALISE MASK = 1
BTFSC HOP3,3 ; SHIFT MASK 4X IF BIT 2 SET
MOVLW 10000B ; SHIFT MASK 4X IF BIT 2 SET
MOVWF MASK ; INITIALISE MASK = 1 BTFSS HOP2,0 ; SHIFT MASK ANOTHER 2X IF BIT 1 SET
GOTO $+3
RLF MASK,F
RLF MASK,F BTFSC HOP1,0 ; SHIFT MASK ANOTHER 1X IF BIT 0 SET
RLF MASK,F ; MASK HAS NOW BEEN SHIFTED 0-7 TIMES ACCORDING TO BITS 2:1:0 MOVLW 0 ; TABLE INDEX = 0
BTFSC HOP4,1
IORLW 2 ; IF BIT 3 SET ADD 2 TO THE TABLE INDEX
BTFSC HOP4,6
IORLW 4 ; IF BIT 4 SET ADD 4 TO THE TABLE INDEX ADDWF PC,F ; ADD THE INDEX TO THE PROGRAM COUNTER
; [ MUST BE IN LOWER HALF OF PAGE ]
TABLE
MOVLW 02EH ; BITS 4:3 WERE 00
GOTO TABLE_END ; END OF LOOKUP MOVLW 074H ; BITS 4:3 WERE 01
GOTO TABLE_END ; END OF LOOKUP MOVLW 05CH ; BITS 4:3 WERE 10
GOTO TABLE_END ; END OF LOOKUP MOVLW 03AH ; BITS 4:3 WERE 11
TABLE_END ANDWF MASK,F ; ISOLATE THE CORRECT BIT BY ANDING WITH MASK
MOVLW 0 ; COPY THE BIT TO BIT 7
SKPZ ; COPY THE BIT TO BIT 7
MOVLW 10000000B ; COPY THE BIT TO BIT 7 XORWF HOP2,W ; ONLY INTERESTED IN BIT HOP2,7
XORWF HOP4,W ; ONLY INTERESTED IN BIT HOP4,7
XORWF KEY1,W ; ONLY INTERESTED IN BIT KEYREG1,7 MOVWF MASK ; STORE W TEMPORARILY (WE NEED BIT 7)
RLF MASK,F ; LEFT ROTATE MASK TO GET BIT 7 INTO THE CARRY RLF HOP1,F ; SHIFT IN THE NEW BIT
RLF HOP2,F
RLF HOP3,F
RLF HOP4,F ROTATE_KEY CLRC ; CLEAR CARRY
BTFSC KEY7,7 ; SET CARRY IF LEFTMOST BIT SET
SETC ; SET CARRY IF LEFTMOST BIT SET RLF KEY0,F ; LEFT-ROTATE THE 64-BIT KEY
RLF KEY1,F
RLF KEY2,F
RLF KEY3,F
RLF KEY4,F
RLF KEY5,F
RLF KEY6,F
RLF KEY7,F DECFSZ CNT0,F ; INNER LOOP 48 TIMES
GOTO DECRYPT_INNER ; INNER LOOP 48 TIMES DECFSZ CNT1,F ; OUTER LOOP 12 TIMES (11 + 1 TO RESTORE KEY)
GOTO DECRYPT_OUTER ; OUTER LOOP 12 TIMES (11 + 1 TO RESTORE KEY) RETLW 0 ; RETURN ;------------------------------------------------------------------------------
;
; FUNCTION : LOAD_CNT_VALS()
;
; DESCRIPTION : LOAD COUNTERS INTO WRITE BUFFERS
;
; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE
;
;------------------------------------------------------------------------------ LOAD_CNT_VALS
MOVFW CNTR_HI ; LOAD MSB OF COUNTER
MOVWF TMP1
MOVFW CNTR_LW ; LOAD LSB OF COUNTER
MOVWF TMP2
RETLW 0 ;------------------------------------------------------------------------------
;
; FUNCTION : RECEIVE()
;
; DESCRIPTION : RECEPTION ROUTINE FOR PWM TRANSMISSIONS
;
; NOTE : THIS ROUTINE MUST BE IN THE LOWER HALF OF THE PAGE
;
;------------------------------------------------------------------------------ RECEIVE ;******** WAIT FOR HEADER AND CALIBRATE ******************* BTFSS PORTA,RFIN ; INPUT LOW?
GOTO RMT_0 ; YES; RECEIVE ERROR MOVLW 10 ; 10 ms TIMER
MOVWF CNT1
RCV0
MOVLW 200
MOVWF CNT0
RCV1
BTFSS PORTA,RFIN ; [2] INPUT HIGH?
GOTO RCV2 ; [0] NO, JUMP OUT OF LOOP
DECFSZ CNT0,1 ; [1] YES, CONTINUE WITH TIMING LOOP
GOTO RCV1 ; [2] 5 us X CNT0
DECFSZ CNT1,1 ; [0] DO 1 ms LOOP CNT1 TIMES
GOTO RCV0 ; [0] RCV2
CLRF CNT0 ; [1] CLEAR CALIB COUNTER LOW BYTE
CLRF CNT1 ; [1] CLEAR CALIB COUNTER HIGH BYTE ;*************************************************************************
; 2.5 IS AVERAGE FOR DETECTING FALLING EDGE IN RCV1
; 2 INSTRUCTIONS FOR JUMP OUT RCV1 TO RCV2
; 2 INSTRUCTIONS FOR RCV2 - CLEAR CALIBRATION COUNTER
; TOTAL 6.5 INSTRUCTIONS < 1 CALIBRATION LOOP SO DISCARD
;************************************************************************* RCV3
BTFSC PORTA,RFIN ; [2][2] INPUT HIGH?
GOTO RCV6 ; [0][0] YES--END CALIBRATION
INCF CNT0,1 ; [1] INCREMENT 16BIT COUNTER
SKPNZ ; [2]
INCF CNT1,1 ; [0]
CLRWDT ; [1] RESET WATCH DOG TIMER
NOP ; [1]
BTFSS CNT1,3 ; [1]
GOTO RCV3 ; [2]
GOTO RMT_0 ; [0]
; TOTAL = 10
RCV6
CLRC ; [1] DIVIDE CNT1:CNT0 BY 8 (600/8=75)
RRF CNT1,1 ; [1]
RRF CNT0,1 ; [1]
RRF CNT1,1 ; [1]
RRF CNT0,1 ; [1]
RRF CNT1,1 ; [1]
RRF CNT0,1 ; [1]
MOVLW MIN/80 ; [1]
SUBWF CNT0,W ; [1]
BTFSS STATUS,C ; [2] NEGATIVE?
GOTO RMT_0 ; [0] YES--HEADER SHORTER THAN MIN.
; TOTAL = 11
; ************* VALID HEADER RECEIVED *********************
RCV7
MOVLW NBITS ; [1] VALID START MARKER WAS RECEIVED
MOVWF CNT1 ; [1]
MOVF CNT0,W ; [1]
MOVWF CNT2 ; [1] CNT2 = CNT0
MOVLW 6H ; [1] SEE NOTE BELOW
SUBWF CNT2,1 ; [1]
GOTO DL1 ; [2] COMPENSATE FOR FIRST BIT
; TOTAL = 8 ;**********************************************************************************
; 2.5 IS AVERAGE PLAY BETWEEN RISING EDGE AND JUMP OUT OF CALIBRATION LOOP.
; 2 FOR JUMP OUT OF RCV3 TO RCV6
; 11 INSTRUCTIONS FOR RVC6 - CAIBRATION COUNTER DIVIDE
; 8 INSTRUCTIONS FOR RCV7 - COMPENSATE FOR POST CALIBRATION CALCUATIONS
; TOTAL 22.5 INSTRUCTIONS BETWEEN RISING EDGE AND ENTERING DL1
; THEREFORE SUBTRACT 22.5/4 = 5.625 TO COMPENSATE FOR POST CALCULATION ON 1ST BIT
;********************************************************************************** RCV8
MOVLW 4H ; [1] WAIT A MAXIMUM OF 4 Te
MOVWF TMP_CNT ; [1] SET TEMP LOOP COUNTER RCV10A
MOVFW CNT0 ; [1] and CSR processing
MOVWF CNT2 ; [1] Refer to explanation above RCV10B
BTFSC PORTA,RFIN ; [2] Wait for rising edge
GOTO RCV11 ; [0] Edge found--Process
CLRWDT ; [1] Clear watchdog Timer
BTFSC PORTA,RFIN ; [2] Wait for Next rising edge
GOTO RCV11 ; [0] Edge found--Process
DECFSZ CNT2,1 ; [1] Decrement Timeout counter
GOTO RCV10B ; [2] Loop Back
; TOTAL = 8, RFIN CHECKED EVERY 4uS ON AVERAGE DECFSZ TMP_CNT,1 ; [1] ALL Te PERIODS
GOTO RCV10A ; [2] ... NO, THEN WAIT FOR NEXT ONE
GOTO RMT01 ; [0] ... YES, [0] TIMEOUT--no edge found RCV11
MOVLW 3H ; [1] SEE NOTE BELOW
SUBWF CNT0,W ; [1]
MOVWF CNT2 ; [1] ;*************************************************************************
; 2 SETUP OF TEMP LOOP COUNTER ( ONLY ONCE )
; 2 SETUP TE LOOP COUNTER ( MAX 4 )
; 3 DECREMENT TEMP LOOP COUNTER ( MAX 4 )
; 4 IS THE AVERAGE PLAY BETWEEN EDGE AND EDJE BEING DETECTED IN RCV9
; 2 JUMP OUT OF RCV10B TO RCV11
; 3 FOR RCV11
; TOTAL 10 INSTRUCTIONS BETWEEN EDGE AND ENTERING DL1
; THEREFORE SUBTRACT 10/4 = 2.5 => 3 DL1 LOOPS TO COMPENSATE FOR
;************************************************************************* DL1
CLRWDT ; [1] RESET WATCHDOG TIMER
DECFSZ CNT2,1 ; [1] [2, IF SKIP]
GOTO DL1 ; [2] CNT0 X 4 us SAMPLE1
BTFSS PORTA,RFIN ; [2] INPUT HIGH? FIRST SAMPLE
GOTO RMT01 ; [0] NO--ERROR MOVF CNT0,W ; [1] CALIBRATION COUNTER
MOVWF CNT2 ; [1] (NOMINALLY 75 FOR 300 us PULSE)
DECF CNT2,1 ; [1] SUBTRACT 2 FROM FINAL CALIB COUNTER TO COMPENATE FOR THIS
GOTO $+1 ; [2]
NOP ; [1]
; TOTAL = 8 => 1 LOOP COUNTER
DL2
CLRWDT ; [1] RESET WATCHDOG TIMER
GOTO $+1 ; [2] WASTE TIME
GOTO $+1 ; [2] WASTE TIME
DECFSZ CNT2,1 ; [1]
GOTO DL2 ; [2] CNT0 X 8 us [ CNT0 x Te ] SAMPLE2
BCF FLAGS,BITIN ; [1] CLEAR BIT POSITION
BTFSS PORTA,RFIN ; [1.5] LEAVE 0 IF LINE HIGH
BSF FLAGS,BITIN ; [0.5] MAKE 1 IF LINE LOW
; SUB TOTAL = 3 CYCLES CALL ROT_SHIFT ; [11]+[2] CSR SHIFT + CALL
BCF CSR7,7 ; [1]
BTFSC FLAGS,BITIN ; [1.5]
BSF CSR7,7 ; [0.5]
; SUB TOTAL = 16 CYCLES
MOVF CNT0,W ; [1] CALIBRATION COUNTER
MOVWF CNT2 ; [1] (NOMINALLY 75 FOR 300 us PULSE)
MOVLW 3 ; [1] SEE CALCULATION BELOW
SUBWF CNT2,1 ; [1]
NOP ; [1]
; SUB TOTAL = 5 CYCLE
; TOTAL = 24 => 24/8 = 3 LOOP COUNTERS
;*************************************************************************
; TOTAL = 24 INSTRUCTIONS
; SUBTRACT 24/8 = 3 TO COMPESATE FOR UPDATEING CSR AND OTHER PROCESSING
; AFTER DATA SAMPLE IS TAKEN.
;*************************************************************************
DL3
GOTO $+1 ; [2] WASTE TIME
GOTO $+1 ; [2] WASTE TIME
CLRWDT ; [1] RESET WATCHDOG TIMER
DECFSZ CNT2,1 ; [1]
GOTO DL3 ; [2] CNT0 X 8 us [ CNT0 X Te ] SAMPLE3
BTFSC PORTA,RFIN ; [2] INPUT LOW? THIRD SAMPLE
GOTO RMT0 ; [0] NO--RECEIVE ERROR CALL TST_RTCC ; [11] CHECK RTCC DECFSZ CNT1,1 ; [1] LAST BIT?
GOTO RCV8 ; [2] ... NO, GET NEXT BIT
GOTO RMT1 ; TOTAL = 14 CYCLES
RMT_0
RMT0
RMT01 BSF STATUS,C ; INVALID TRANSMISSION
RETLW 1 ; RETURN
RMT1 BSF PORTA,LED ; VALID TRANSMISSION FORMAT, LED ON
MOVLW 0FH ; FORCE OPEN BUTTON CODES TO ZERO
ANDWF SER_0,1
CLRC ; VALID SERIAL NUMBER => VALID TX
RETLW 0 ; RETURN ;------------------------------------------------------------------------------
;
; FUNCTION : M_LOOP ()
;
; DESCRIPTION : MAIN PROGRAM ROUTINE
;
;------------------------------------------------------------------------------ M_LOOP BCF PORTA,LED
BTFSS PORTA,LRN
GOTO LEARN ; TEST & HANDLE LEARN BUTTON
CALL TST_RTCC ; UPDATE TIMER
CALL TST_TIMER ; HANDLE TIMER - UPDATE OUTPUTS
CALL RECEIVE ; RECEIVE TRANSMISSION
BC M_LOOP ; CHECK IF TRANSMISSION VALID M_SEARCH
CLRF TXNUM ; TEST FIRST POSITION
; ******* COMPARE LOWER WORD OF SERIAL NUMBER ********
M_SERIAL
CALL TX_LOOKUP ; GET TX BASE ADDRESS
BSF ADDRESS,1 ; ADD 2 TO BASE ADDRESS
CALL EEREAD ; READ LOWER 16-BITS OF SER# FROM EEPROM
MOVFW TMP1 ; COMPARE RX AND EEPROM VALUES
XORWF SER_2,W
BNZ M_NEXT ; IF NOT EQUAL CHECK NEXT
MOVFW TMP2 ; COMPARE RX AND EEPROM VALUES
XORWF SER_3,W
BNZ M_NEXT ; IF NOT EQUAL CHECK NEXT
; ******* COMPARE UPPER WORD OF SERIAL NUMBER ********
M_SERIAL2
INCF ADDRESS,F ; POINT TO NEXT ENTRY
CALL EEREAD ; READ UPPER 16-BITS OF SER# FROM EEPROM MOVFW TMP1 ; COMPARE RX AND EEPROM VALUES
XORWF SER_0,W
BNZ M_NEXT ; IF NOT EQUAL CHECK NEXT MOVFW TMP2 ; COMPARE RX AND EEPROM VALUES
XORWF SER_1,W
BNZ M_NEXT ; IF NOT EQUAL CHECK NEXT BTFSS FLAGS,LRNF ; LEARN MODE
GOTO M_HOP ; FOUND TRANSMITTER - DECRYPT BSF FLAGS,RELEARN ; SET RELEARN FLAG
GOTO LEARN_F ; FOUND TRANSMITTER - LEARN
; **** SEARCH NEXT POSITION FOR SERIAL NUMBER *****
M_NEXT INCF TXNUM,F ; POINT TO NEXT TRANSMITTER POSITION
MOVLW MAX_USERS ; TEST FOR LAST POSITION
SUBWF TXNUM,W
BTFSS STATUS,C ; NOT FOUND IN MAP
GOTO M_SERIAL ; TRY NEXT POSITION
M_NF
BTFSS FLAGS,LRNF ; LEARN MODE
GOTO M_LOOP ; NO... INVALID SERIAL NUMBER
GOTO LEARN_NF ; NEW TRANSMITTER - USE POINTER FOR LEARN ; ********** DECRYPT HOPCODE *********************
M_HOP
CALL DECRYPT ; DECRYPT HOPCODE ; ********* TEST DICRIMINATION VALUE *************
M_DIS MOVFW SER_3 ; SERIAL NUBER LSB MUST BE EQUAL
XORWF DISC,W ; TO DISCRIMINATION VALUE
BNZ M_LOOP ; *************** CHECK COUNTERS VALID ************
BCF FLAGS,SEC_CNT ; CHECK FIRST COUNTER
M_CNT CALL TX_LOOKUP ; POINT LOWER 16 BIT COUNTER
BTFSC FLAGS,SEC_CNT ; IF SECOND COUNTER IS USED
INCF ADDRESS,F ; INCREMENT ADDRESS
CALL EEREAD ; READ LOWER 16 BIT COUNTER FROM EEPROM ; ************ CHECK COUNTER WINDOWS ***********
M_SUB
MOVFW TMP2 ; 16 BIT COUNTER SUBSTRACTION
SUBWF CNTR_LW,W
MOVWF TMP2
SKPC ; SKIP IF NO BORROW
INCF TMP1,F ; ... ELSE INCR HI BYTE
MOVFW TMP1
SUBWF CNTR_HI,W
MOVWF TMP1 BCF TMP1,0 ; MAKE ACCEPTED WINDOW 512 M_CHECK0
MOVFW TMP1 ; TEST IF IN WINDOW ( UPPER BYTE )
BTFSC STATUS,Z
GOTO M_CHECK2 ; GO AND CHECK LOWER BYTE BTFSC FLAGS,SEC_CNT ; IF SECOND COUNTER
GOTO M_LOOP ; ERROR - GOTO MAIN LOOP BSF FLAGS,SEC_CNT ; SET FLAG FOR SECOND COUNTER CHECK
GOTO M_CNT ; AND CHECK IT M_CHECK2
MOVFW TMP2 ; CHECK LOWER BYTE
BZ M_TZERO ; IF REPEAT - RESET TIMEOUT COUNTER ; ************ UPDATE EEPROM COUNTER ***********
M_UPDATE
CALL TX_LOOKUP ; GET CURRENT TX BASE ADDRESS
CALL LOAD_CNT_VALS ; LOAD COUNTER VALUES
CALL EEWRITE ; UPDATE FIRST COUNTER
CALL LOAD_CNT_VALS ; LOAD COUNTER VALUES
CALL EEWRITE ; UPDATE SECOND COUNTER ; ******** UPDATE OUTPUT WITH CURRENT BUTTON CODE ******** M_OUTPUT
MOVLW 0F0H ; MASK ONLY BUTTON CODES
ANDWF FUNC,1
SWAPF FUNC,1 ; GET BUTTON CODE FROM FUNC BYTE
BTFSC FUNC,0 ; CHANGE BUTTON TO S-OUTPUT FORMAT
BSF FUNC,4 ; [ S2 S1 S0 S3 ]
CLRC
RRF FUNC,W
M_OUTPUT1
MOVWF PORTB ; UPDATE PORT WITH FUNCTION CODE M_TZERO CLRF CNT_HI ; RESET RTCC CLOCK
CLRF CNT_LW M_END
GOTO M_LOOP ; WAIT FOR NEXT TRANMISSION ;------------------------------------------------------------------------------
;
; FUNCTION : LEARN ()
;
; DESCRIPTION : LEARN ROUTINE
;
;------------------------------------------------------------------------------ LEARN
CLRF CNT_LW ; RESET TIMER
CLRF CNT_HI
LEARN1 BSF PORTA,LED ; LED ON
CALL TST_RTCC ; UPDATE TIMER
BTFSC PORTA,LRN ; TEST FOR BUTTON RELEASE
GOTO LEARN2 ; ENTER LEARN MODE
BTFSS CNT_HI,0 ; TEST FOR ERASE ALL
GOTO LEARN1 ; LOOP BACK ; ******* EEPROM ERASE ALL ****************** BCF PORTA,LED
ERASE_ALL
CLRWDT ; CLEAR WATCHDOG TIMER
BTFSS PORTA,LRN ; WAIT FOR BUTTON RELEASE
GOTO ERASE_ALL ; LOOP BACK MOVLW 30H ; ERASE ENABLE COMMAND
MOVWF OUTBYT
CALL SENDC ; SEND COMMAND TO EEPROM
MOVLW 20H ; ERASE ALL COMMAND
MOVWF OUTBYT
CALL SENDC ; SEND COMMAND TO EEPROM
CALL WAITACK ; WAIT FOR ERASE ACK
GOTO RESET ; START OVER
LEARN2
BCF PORTA,LED ; CLEAR LED
BSF FLAGS,LRNF ; SET LEARN FLAG LEARN3
CALL TST_RTCC ; UPDATE TIMER
CALL TST_TIMER ; CHECK FOR LEARN TIMEOUT
CALL RECEIVE ; RECEIVE TRANSMISSION
BC LEARN3 ; CHECK IF TRANSMISSION VALID
GOTO M_SEARCH ; CHECK IF SERIAL NUMBER IS IN MAP LEARN_NF ; *** IF SERIAL NOT IN MAP READ SELFLEARN POINTER *** MOVLW LRNPTR ; POINT TO LEARN POINTER
MOVWF ADDRESS
CALL EEREAD ; READ LEARN POINTER FROM EEPROM MOVF TMP2,W ; CHECK LOWER BYTE
MOVLW 0H ; LOAD 0 DEFAULT
BTFSC STATUS,Z ; IF LOWER != 0 LEARN ON 0
MOVF TMP1,W ; ELSE LEARN ON TMP1 VALUE
MOVWF TXNUM ; LOAD TXNUM LEARN_F
CALL TX_LOOKUP
BSF ADDRESS,1 ; ADD 2 TO BASE ADDRESS
MOVFW SER_2 ; GET LOWER 16 BIT OF SERIAL NUMBER
MOVWF TMP1
MOVFW SER_3
MOVWF TMP2
CALL EEWRITE ; ... AND WRITE TO EEPROM
MOVFW SER_0 ; GET UPPER 16 BIT OF SERIAL NUMBER
MOVWF TMP1
MOVFW SER_1
MOVWF TMP2
CALL EEWRITE ; ... AND WRITE TO EEPROM ; *** DECRYPT HOP CODE *** LEARN_DEC
CALL DECRYPT ; DECRYPTION ROUTINE ; *** CHECK DISCRIMINATION VALUE *** LEARN_CHK
MOVFW SER_3 ; CHECK LOWER BYTE OF SERIAL NUMBER
XORWF DISC,W ; AGAINST DISCRIMINATION VALUE
BZ LEARN_UP ; UPDATE LEARN POINTER
GOTO CANCEL_LEARN ; ERROR CANCEL LEARN MODE ; ********* UPDATE LEARN POINTER **********
LEARN_UP
CALL TX_LOOKUP ; GET CURRENT TX BASE ADDRESS
CALL LOAD_CNT_VALS
CALL EEWRITE ; WRITE LSB WORD OF COUNTER TO EEPROM BTFSC FLAGS,RELEARN ; IF RELEARN
GOTO BYPASS_POINTER_WRITE ; DONT UPDATE POINTER INCF TXNUM,F ; INCREMENT LEARN POINTER
MOVLW MAX_USERS ; ALLOW 0 .. MAX_USERS - 1
SUBWF TXNUM,W
MOVLW 0H ; IF MAX WRAP TO 0
BTFSS STATUS,C
MOVF TXNUM,W ; ELSE USE TXNUM
MOVWF TMP1 ; FOR WRITE OPERATION CLRF TMP2 ; CLEAR LOWER BYTE
MOVLW LRNPTR ; POINT TO LEARN POINTER
MOVWF ADDRESS
CALL EEWRITE ; UPDATE LEARN POINTER IN EEPROM BYPASS_POINTER_WRITE BSF PORTA,LED ; LED ON TO INDICATE VALID LEARN CLRF CNT_LW ; CLEAR COUNTER LOW BYTE SUCCESS
CALL TST_RTCC ; INDICATE SUCCESSFUL LEARN
BTFSS CNT_LW,4 ; LED ON FOR 0.5 SEC
GOTO SUCCESS ; LOOP BACK CANCEL_LEARN
BCF FLAGS,LRNF ; CLEAR LEARN FLAG
BCF FLAGS,RELEARN ; CLEAR RELEARN FLAG
GOTO M_LOOP ; RETURN TO MAIN LOOP - LED OFF ;------------------------------------------------------------------------------
; END OF FILE : SIMDEC10.ASM
;------------------------------------------------------------------------------ ORG 1FFH
GOTO RESET
END
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