📄 gdm.txt
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; MICROCHIP KEELOQ CODE HOPPING SIMPLE DECODER
;
; 一步学习； 单一键
;---------------------------------------------------------
; 配置控制:
;
; -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
;
;---------------------------------------------
LIST P=16C54,R=DEC
;---------------------------------------------
MAX_USERS EQU 15
; 这是系统的最大数，因此系统能记住(1 to 15).
;---------------------------------------------
IND EQU 00H
RTCC EQU 01H
PC EQU 02H
STATUS EQU 03H
FSR EQU 04H
PORTA EQU 05H
PORTB EQU 06H
;----------------------
FLAGS EQU 07H
ADDRESS EQU 08H
TXNUM EQU 09H
OUTBYT EQU 0AH
MASK EQU OUTBYT
TMP_CNT EQU OUTBYT
CNT0 EQU 0BH ; ;计数
CNT1 EQU 0CH
CNT2 EQU 0DH
CNT_HI EQU 0EH ; 16位时钟
CNT_LW EQU 0FH
CSR0 EQU 10H ; 64 位接收移位寄存器
CSR1 EQU 11H
CSR2 EQU 12H
CSR3 EQU 13H
CSR4 EQU 14H
CSR5 EQU 15H
CSR6 EQU 16H
CSR7 EQU 17H
TMP1 EQU 18H
TMP2 EQU 19H
REG EQU 1AH ;
REG1 EQU 1BH ; 临时寄存器
;
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
;
HOP1 EQU CSR0 ; 32 BIT
HOP2 EQU CSR1
HOP3 EQU CSR2
HOP4 EQU CSR3
;
SER_0 EQU CSR7 ; 28 BIT 串行数
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 -------------------
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
ORG 00H
;=========================================
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
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