please dont rip this site

PIC Microcontroler based Keyboard

3x4 Keypad Lock w/ 4 bit LCD

by Bert Botha [bert at itsserv,co,za]

;*************************************************************************************
;Program that communicates with a keypad and displays only * to mask the number.     *
;This display indicates the mode that it is in. The six digit code is input and a    *
;calculation is done to determine if the code is correct.                            *
;*********02/12/2003*****************15H15**********************************BJB*******




;*************************************************************************************
;                                       Setup                                        *
;*************************************************************************************
                LIST        P=16F84A              ;Processor type
                ERRORLEVEL  -302                  ;Suppress warning of bank 1 operands
                INCLUDE     "P16F84A.INC"         ;
MYREG           EQU         0X20                  ;
OUTPUT          EQU         0X21                  ;This reg for data reading to out pin
MYREG1          EQU         0X22                  ;
MYREG2          EQU         0X23                  ;
COUNTER         EQU         0X24                  ;
DIGITS          EQU         0X25                  ;
FLASH1          EQU         0X28                  ;
DELAY2          EQU         0X29                  ;
DELAY3          EQU         0X2A                  ;
COUNTER1        EQU         0X2B                  ;
NUMBER1         EQU         0X2C                  ;
NUMBER2         EQU         0X2D                  ;
NUMBER3         EQU         0X2E                  ;
NUMBER4         EQU         0X2F                  ;
NUMBER5         EQU         0X30                  ;
NUMBER6         EQU         0X31                  ;
CODEDATA        EQU         0X32                  ;
                CLRF        CODEDATA              ;
                CLRF        NUMBER1               ;
                CLRF        NUMBER2               ;
                CLRF        NUMBER3               ;
                CLRF        NUMBER4               ;
                CLRF        NUMBER5               ;
                CLRF        NUMBER6               ;
                CLRF        COUNTER               ;
                CLRF        OUTPUT                ;
                CLRF        MYREG                 ;
                CLRF        MYREG1                ;
                CLRF        MYREG2                ;
                CLRF        DIGITS                ;
                CLRF        FLASH1                ;
                CLRF        COUNTER1              ;
                BSF         STATUS,5              ;Select bank 1
                MOVLW       0X00                  ;All outputs
                MOVWF       TRISA                 ;Ditto
                MOVLW       0X0F                  ;Lower nibble is inputs
                MOVWF       TRISB                 ;Ditto
                BCF         STATUS,5              ;Back to bank 0
                BCF         PORTB,7               ;R/S Set to zero- command mode
                CLRF        PORTA                 ;Ensure all outputs are at zero
                GOTO        START                 ;






;*************************************************************************************
;                                   Pinout use                                       *
;*************************************************************************************
;PORTA , 0  is column 1
;PORTA , 1  is column 2
;PORTA , 2  is column 3
;PORTB , 0  is scanning row 1
;PORTB , 1  is scanning row 2
;PORTB , 2  is scanning row 3
;PORTB , 3  is scanning row 4       
;PORTB , 4  is clock output
;PORTB , 5  is serial output pin
;PORTB , 6  is enable
;PORTB , 7  is R/S pin
 
;*************************************************************************************
;                                   Subroutines                                      *
;*************************************************************************************
ENABLE          BSF         PORTB,6               ;Set ENABLE pin high
                CALL        DELAY                 ;Minimum setup time for the LCD
                BCF         PORTB,6               ;Falling edge needed to trigger LCD
                CALL        DELAY                 ;Kill some time
                RETURN                            ;


DELAY           MOVLW       0xFF                  ;Load 255 into W-register
                MOVWF       MYREG                 ;Move this data into MYREG
LOOP            DECFSZ      MYREG,1               ;Decrement MYREG, ans into MYREG
                GOTO        LOOP                  ;Loop program till MYREG = 0
                RETURN                            ;


LONGDELAY       MOVLW       0XFF                  ;
                MOVWF       DELAY2                ;
LOOP2           DECFSZ      DELAY2,1              ;
                GOTO        LDELAY                ;
                RETURN                            ;
LDELAY          MOVLW       0XFF                  ;
                MOVWF       DELAY3                ;
LOOP3           DECFSZ      DELAY3,1              ;
                GOTO        LOOP3                 ;
                GOTO        LOOP2                 ;


DELAY1          MOVLW       0x60                  ;Load 96 into W-register
                MOVWF       MYREG2                ;Move this data into MYREG
LOOP1           DECFSZ      MYREG2,1              ;Decrement MYREG, ans into MYREG
                GOTO        LOOP1                 ;Loop program till MYREG = 0
                RETURN                            


CLOCK           BCF         PORTB,4               ;Ensure that *Clock starts at 0
                BSF         PORTB,4               ;Clock value HIGH
                CALL        DELAY                 ;Kill some time
                BCF         PORTB,4               ;Falling edge *Clock
                CALL        DELAY                 ;Kill some time
                RETURN                            ;


SERIAL          MOVWF       OUTPUT                ;Moved data from W to OUTPUT reg
SERIAL1         BCF         PORTB,5               ;Ensure that SERIAL pin starts @ 0
                MOVLW       0x04                  ;There are 4 bits to a nibble
                MOVWF       MYREG1                ;Nibble control for escape
TEST            BTFSC       OUTPUT,7              ;Test data bit 7
                BSF         PORTB,5               ;SET SERIAL pin to 1
                CALL        CLOCK                 ;Clock the data to shift register
                BCF         PORTB,5               ;Reset SERIAL pin for next test
                RLF         OUTPUT,1              ;Rotate the OUTPUT register left
                DECFSZ      MYREG1,1              ;Decrement MYREG1, ans into MYREG1
                GOTO        TEST                  ;Do next bit of the word till all done
                CALL        ENABLE                ;Enable the LCD to read the data             
                RETURN                            ;Escape after the word is output


EX1             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER1               ;Move to number1 reg
                RETURN                            ;
EX2             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER2               ;Move to number2 reg
                RETURN                            ;
EX3             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER3               ;Move to number3 reg
                RETURN                            ;
EX4             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER4               ;Move to number4 reg
                RETURN                            ;
EX5             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER5               ;Move to number5 reg
                RETURN                            ;
EX6             MOVF        CODEDATA,0            ;Move data to w_reg
                MOVWF       NUMBER6               ;Move to number6 reg
                GOTO        CHECK                 ;






;*************************************************************************************
;                                   LCD Initialise                                   *
;*************************************************************************************
START           MOVLW       0x20                  ;4 bit 
                CALL        SERIAL                ;Move this data to the shift register
                MOVLW       0x28                  ;4 bit, 2 line, 7x5 matrix
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0x0C                  ;Disp ON, no cursor 
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0x02                  ;Display & curser home
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0x01                  ;Clear display
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0XC0                  ;Address 40
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
;
;*************************************************************************************
;                                       INTRO                                        *
;*************************************************************************************
                MOVLW       0X03                  ;This is for three tries
                MOVWF       COUNTER1              ;Counter for amount of attempts
ZERO            BSF         PORTB,7               ;Character mode
                MOVLW       'D'                   ;D
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'i'                   ;i
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       's'                   ;s
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       '-'                   ;-
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'a'                   ;a
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'r'                   ;r
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'm'                   ;m
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'i'                   ;i
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'n'                   ;n
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'g'                   ;g
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       ' '                   ;
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'C'                   ;C
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'o'                   ;o
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'd'                   ;d
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       '?'                   ;?
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BCF         PORTB,7               ;Command mode
                MOVLW       0X85                  ;Address
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot




;*************************************************************************************
;                                       MAIN                                         *
;*************************************************************************************


CLEARS          MOVLW       0X06                  ;Setup maximum digits used
                MOVWF       DIGITS                ;This is the max digit used reg
TESTDATA        MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;After movf, leave a copy again in DIGITS
                XORLW       0X06                  ;Has a digit been input ?
                BTFSC       STATUS,Z              ;Well, has it
                CLRF        CODEDATA              ;Ensure that reg CODEDATA is empty
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X05                  ;2nd digit to follow ?
                BTFSC       STATUS,Z              ;Well, is it ?
                CALL        EX1                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X04                  ;3rd digit to follow ?
                BTFSC       STATUS,Z              ;Well, is it ?
                CALL        EX2                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X03                  ;4th digit to follow ?
                BTFSC       STATUS,Z              ;Well, is it ?
                CALL        EX3                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X02                  ;5th digit to follow ?
                BTFSC       STATUS,Z              ;Well, is it ?
                CALL        EX4                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X01                  ;6th digit to follow ?
                BTFSC       STATUS,Z              ;Well, is it ?
                CALL        EX5                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                MOVF        DIGITS,0              ;Re-input number of digits left into W
                MOVWF       DIGITS                ;Re-input number of digits left into W
                XORLW       0X00                  ;All six digits in ?
                BTFSC       STATUS,Z              ;Well, is it ?
                GOTO        EX6                   ;Put the numeric value into the correct
                                                  ;NUMBER register
                BSF         PORTA,0               ;Poke column 1 high
                CALL        DETERMINE             ;Check PORTB lower nibble for change
                BCF         PORTA,0               ;Clear column 1
                BSF         PORTA,1               ;Poke column 2 high
                CALL        DETERMINE             ;Check PORTB lower nibble for change
                BCF         PORTA,1               ;Clear column 2
                BSF         PORTA,2               ;Poke column 3 high
                CALL        DETERMINE             ;Check PORTB lower nibble for change
                BCF         PORTA,2               ;Clear column 3
                GOTO        TESTDATA              ;Loop, check everything again




;*************************************************************************************
;                                   CALCULATION                                      *
;*************************************************************************************


CHECK           MOVF        NUMBER1,0             ;Put numeric input 1 into W register
                XORLW       0X05                  ;Is the first saved value 5?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                MOVF        NUMBER2,0             ;Put numeric input 2 into W register
                XORLW       0X09                  ;Is the second saved value 9?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                MOVF        NUMBER3,0             ;Put numeric input 3 into W register
                XORLW       0X07                  ;Is the third saved value 7?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                MOVF        NUMBER4,0             ;Put numeric input 4 into W register
                XORLW       0X05                  ;Is the fourth saved value 5?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                MOVF        NUMBER5,0             ;Put numeric input 5 into W register
                XORLW       0X03                  ;Is the fifth saved value 3?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                MOVF        NUMBER6,0             ;Put numeric input 6 into W register
                XORLW       0X01                  ;Is the sixth saved value 1?
                BTFSS       STATUS,Z              ;Well, is it ?
                GOTO        LOCKED                ;No? start from scratch
                GOTO        TWO                   ;Good the code is correct




;*************************************************************************************
;                                   DETERMINATION                                    *
;*************************************************************************************                   


DETERMINE       BTFSC       PORTB,0               ;Check first row
                GOTO        DEBOUNCE              ;Run debounce subroutine
                BTFSC       PORTB,1               ;Check second row
                GOTO        DEBOUNCE1             ;Run debounce routine
                BTFSC       PORTB,2               ;Check third row
                GOTO        DEBOUNCE2             ;Run debounce routine
                BTFSC       PORTB,3               ;Check fouth row
                GOTO        DEBOUNCE3             ;Run debounce routine
                RETURN                            ;


DEBOUNCE        MOVLW       0X04                  ;The amount of samples
                MOVWF       COUNTER               ;The sample register
TESTING         CALL        DELAY1                ;Kill some time     
                BTFSS       PORTB,0               ;Re-check this bit
                GOTO        START                 ;False trigger, escape to start
                DECFSZ      COUNTER,1             ;Re-sample 4 times
                GOTO        TESTING               ;Ditto
TEST1           BTFSC       PORTB,0               ;Wait for release
                GOTO        TEST1                 ;Ditto
                BSF         PORTB,7               ;R/S set to 1 for character display
                BTFSC       PORTA,0               ;Was it the first column?
                GOTO        i1                    ;This is the character (without i )
                BTFSC       PORTA,1               ;Was it the second column?
                GOTO        i2                    ;This is the character (without i )
                BTFSC       PORTA,2               ;Was it the third column?
                GOTO        i3                    ;This is the character (without i )
                GOTO        START                 ;
i1              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X01                  ;Numeric value 1
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i2              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X02                  ;Numeric value 2
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i3              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X03                  ;Numeric value 3
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
DEBOUNCE1       MOVLW       0X04                  ;The amount of samples
                MOVWF       COUNTER               ;The sample register
TESTING1        CALL        DELAY1                ;Kill some time
                BTFSS       PORTB,1               ;Re-check this bit
                GOTO        START                 ;False trigger, escape to start
                DECFSZ      COUNTER,1             ;Re-sample 4 times
                GOTO        TESTING1              ;Ditto
TEST2           BTFSC       PORTB,1               ;Wait for release
                GOTO        TEST2                 ;Ditto
                BSF         PORTB,7               ;R/S set to 1 for character display
                BTFSC       PORTA,0               ;Was it the first column?
                GOTO        i4                    ;This is the character (without i )
                BTFSC       PORTA,1               ;Was it the second column?
                GOTO        i5                    ;This is the character (without i )
                BTFSC       PORTA,2               ;Was it the third column?
                GOTO        i6                    ;This is the character (without i )
                GOTO        START                 ;
i4              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X04                  ;Numeric value 4
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i5              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X05                  ;Numeric value 5
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i6              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X06                  ;Numeric value 6
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
DEBOUNCE2       MOVLW       0X04                  ;The amount of samples
                MOVWF       COUNTER               ;The sample register
TESTING2        CALL        DELAY1                ;Kill some time
                BTFSS       PORTB,2               ;Re-check this bit
                GOTO        START                 ;False trigger, escape to start
                DECFSZ      COUNTER,1             ;Re-sample 4 times
                GOTO        TESTING2              ;Ditto
TEST3           BTFSC       PORTB,2               ;Wait for release
                GOTO        TEST3                 ;Ditto
                BSF         PORTB,7               ;R/S set to 1 for character display
                BTFSC       PORTA,0               ;Was it the first column?
                GOTO        i7                    ;This is the character (without i )
                BTFSC       PORTA,1               ;Was it the second column?
                GOTO        i8                    ;This is the character (without i )
                BTFSC       PORTA,2               ;Was it the third column?
                GOTO        i9                    ;This is the character (without i )
                GOTO        START                 ;
i7              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X07                  ;Numeric value 7
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i8              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X08                  ;Numeric value 8
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i9              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X09                  ;Numeric value 9
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
DEBOUNCE3       MOVLW       0X04                  ;The amount of samples
                MOVWF       COUNTER               ;The sample register
TESTING3        CALL        DELAY1                ;Kill some time
                BTFSS       PORTB,3               ;Re-check this bit
                GOTO        START                 ;False trigger, escape to start
                DECFSZ      COUNTER,1             ;Re-sample 4 times
                GOTO        TESTING3              ;Ditto
TEST4           BTFSC       PORTB,3               ;Wait for release
                GOTO        TEST4                 ;Ditto
                BSF         PORTB,7               ;R/S set to 1 for character display
                BTFSC       PORTA,0               ;Was it the first column?
                GOTO        ix                    ;This is the character (without i )
                BTFSC       PORTA,1               ;Was it the second column?
                GOTO        i0                    ;This is the character (without i )
                BTFSC       PORTA,2               ;Was it the third column?
                GOTO        i#                    ;This is the character (without i )
                GOTO        START                 ;Wasn't triggered,check again
ix              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X2A                  ;ASCII symbol *
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i0              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X00                  ;Numeric value 0
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning
i#              MOVLW       '*'                   ;*
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X23                  ;ASCII symbol #
                MOVWF       CODEDATA              ;Save data for manipulation
                DECF        DIGITS,1              ;Reduce digits register
                BCF         PORTB,7               ;Command mode
                GOTO        TESTDATA              ;Redo the keypad scanning




;*************************************************************************************
;                                     OUTCOMES                                       *
;*************************************************************************************


LOCKED          BCF         PORTB,7               ;Command mode
                BSF         PORTA,4               ;Red LED on
                MOVLW       0X01                  ;Clear display
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X06                  ;Increment display shift off
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X86                  ;Address 6
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BSF         PORTB,7               ;Character mode
                MOVLW       'W'                   ;W
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'R'                   ;R
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'O'                   ;O
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'N'                   ;N
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'G'                   ;G
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BCF         PORTB,7               ;Command mode
                MOVLW       0XC6                  ;Address 45
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BSF         PORTB,7               ;Character mode
                MOVLW       'C'                   ;C
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'O'                   ;O
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'D'                   ;D
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'E'                   ;E
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BCF         PORTB,7               ;Command mode
                MOVLW       0X0A                  ;Flash 10 times
                MOVWF       FLASH1                ;Flashing counter
FLASH           MOVLW       0X08                  ;Display off
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                CALL        LONGDELAY             ;Kill a long time
                MOVLW       0X0C                  ;Display on
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                CALL        LONGDELAY             ;Kill a long time
                DECFSZ      FLASH1,1              ;Reduce amount of flashes by 1
                GOTO        FLASH                 ;Make the display flash on and off
                BCF         PORTB,7               ;Command mode
                MOVLW       0X01                  ;Clear display
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0XC0                  ;Address 40
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BCF         PORTA,4               ;Red LED off
                DECFSZ      COUNTER1,1            ;Count if max attempt reached
                GOTO        ZERO                  ;Re-ask for the code
ONE             BSF         PORTA,4               ;Red LED on
                BCF         PORTB,7               ;Command mode
                MOVLW       0X01                  ;Clear display
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X85                  ;Address 05
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BSF         PORTB,7               ;Character mode
                MOVLW       'L'                   ;L
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'O'                   ;O
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'C'                   ;C
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'K'                   ;K
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'E'                   ;E
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'D'                   ;D
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BCF         PORTB,7               ;Command mode
                MOVLW       0XC0                  ;Address 40
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BSF         PORTB,7               ;Character mode
                MOVLW       'U'                   ;U
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       's'                   ;s
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       ' '                   ;
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'M'                   ;M
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'a'                   ;a
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       's'                   ;s
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       't'                   ;t
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'r'                   ;r
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       ' '                   ;
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'C'                   ;C
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'o'                   ;o
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'd'                   ;d
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                GOTO        $                     ;
TWO             BCF         PORTB,7               ;Command mode
                MOVLW       0X01                  ;Clear display
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       0X82                  ;Address 02
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                BSF         PORTA,3               ;Green LED on
                BSF         PORTB,7               ;Character mode
                MOVLW       'D'                   ;D
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       '-'                   ;-
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'A'                   ;a
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'c'                   ;c
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       't'                   ;t
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'i'                   ;i
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'v'                   ;v
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'a'                   ;a
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       't'                   ;t
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'e'                   ;e
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
                MOVLW       'd'                   ;d
                CALL        SERIAL                ;This will output 4 bits only
                CALL        SERIAL1               ;cause the low 4 are already high rot
;*************************************************************************************
                GOTO        $                     ;
                END
            
                
                    

Note that the four bits for reading in the keypad all have 1k resistors as passive pull down with a keystroke as active pull-up. This ensures that the otherwise floating input does not cause false code to be read in.

 

 

+

See:

Questions:

Comments:


file: /Techref/microchip/3x4key-4blcd-lock.htm, 49KB, , updated: 2008/7/6 16:33, local time: 2024/3/28 11:55, owner: bj-hotmail-,
TOP NEW HELP FIND: 
52.54.103.76:LOG IN

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/microchip/3x4key-4blcd-lock.htm"> PIC Microcontroler 3x4 Keypad Lock w/ 4 bit LCD </A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2024 contributors:
o List host: MIT, Site host massmind.org, Top posters @none found
- Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .