newwbies
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im trying to make my lcd 8 bit to a 4 bit one so i can utilize the other pins of my pic16f84a, but when i run it in the proteus. there are so many errors.. i dont know whats wrong with it.. and i i dont understand it.. could you please help me.. heres the code and the circuit..
Code:
;************************************************
; LCD Interface - 4-BIT Operation *
; By A Nickson 2004 *
; Version 1.0 *
; *
;Versions: *
; 1.0 - initial set-up and test *
; *
; *
; *
;Connections: *
; E = B0 *
; RS = B1 *
; RW = B2 *
; Data D4 - D8 = B4 - B8 *
; *
;************************************************
Processor 16F84A
#include "p16F84A.inc"
__CONFIG _CP_OFF & _PWRTE_OFF & _WDT_OFF & _XT_OSC
org 0x00
mhz EQU D'4'
PORTA EQU 5
PORTB EQU 6
TRISA EQU 85
TRISB EQU 86
OPTREG EQU 81
STATUS EQU 3
CARRY EQU 0
RP0 EQU 5
Z EQU 2
E EQU 0 ;Enable on portB
RS EQU 1 ;Read/Write on portB
RW EQU 2 ;Register Select on portB
PDel0 EQU 14 ;timers
PDel1 EQU 15 ;timers
STORE EQU 19 ;Stored data to send
hour_hi equ 0fh
hour_lo equ 10h
min_hi equ 11h
min_lo equ 12h
sec_hi equ 13h
sec_lo equ 14h
; temp equ 15h
count1 equ 16h
count2 equ 17h
count3 equ 18h
count4 equ 19h
dcnt0 EQU 22h ; delay counter 0
dcnt1 EQU 23h ; delay counter 1
dcnt2 EQU 24h
goto START
ORG 0x04
GOTO START
START
BSF STATUS,RP0 ;SELECT REGISTER BANK 1
movlw 14h ; PORTA output RA0 to RA4
movwf TRISA
movlw 00h
movwf TRISB
BCF STATUS,RP0 ;SELECT REGISTER BANK 0
CLRF PORTA
CLRF PORTB
call LCDINIT
call settime
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
CALL LCDINIT ;Initialize LCD
MOVLW D'72' ;H
CALL LCDOUT
MOVLW D'73' ;I
CALL LCDOUT
; CALL LINE2 ;set crussor to line 2
; MOVLW D'76' ;L
; CALL LCDOUT
; MOVLW D'73' ;I
; CALL LCDOUT
; MOVLW D'78' ;N
; CALL LCDOUT
; MOVLW D'69' ;E
; CALL LCDOUT
; MOVLW D'32' ;space
; CALL LCDOUT
; MOVLW D'49' ;2
; CALL LCDOUT
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
settime
movlw 0x00
movwf hour_hi
movlw 0x00
movwf hour_lo
movlw 0x00
movwf min_hi
movlw 0x00
movwf min_lo
movlw 0x00
movwf sec_hi
movlw 0x00
movwf sec_lo
; movlw 0x00
; movwf motor
;call line3
CALL LCDINIT
call line3
call displaytext
call curhom
out2 movlw d'150'
call udelay
decfsz dcnt2, F
goto out2
call LINE2
call displaytime
out3 movlw d'150'
call udelay
decfsz dcnt2, F
goto out3
circle
call delay
call LINE2
call displaytime
; btfsc PORTA,4
; call button
; btfsc PORTA,2
; call button1
incf sec_lo,1
movlw 0x0a
subwf sec_lo,0
btfss STATUS,0
goto circle
goto c_sechi
c_sechi
clrf sec_lo
incf sec_hi,1
movlw 0x06
subwf sec_hi,0
btfss STATUS,0
goto circle
goto c_minlo
c_minlo
clrf sec_hi
incf min_lo,1
movlw 0x0a
subwf min_lo,0
btfss STATUS,0
goto circle
goto c_minhi
c_minhi
clrf min_lo
incf min_hi,1
movlw 0x06
subwf min_hi,0
btfss STATUS,0
goto circle
goto testhi
testhi
clrf min_hi
movlw 0x02
subwf hour_hi,0
btfss STATUS,0
goto hi1
goto testlow
testlow
; incf hour_lo,1
movlw 0x04
subwf hour_lo,0
btfss STATUS,0
goto low1
goto hi2
hi1
incf hour_lo,1
movlw 0x0a
subwf hour_lo,0
btfss STATUS,0
goto circle
goto low2
low1
goto circle
hi2
clrf hour_lo
clrf hour_hi
goto circle
low2
incf hour_hi,1
clrf hour_lo
goto circle
delay:
loop1 decfsz 08h, 1
goto loop1
decfsz 09h, 1
goto loop1
decfsz 0Ah, 1
goto loop1
return
;**************************************************
delay5
movlw 0x12 ; delay 50us (18*3+2us)
movwf count1
d11
decfsz count1,F
goto d11
return
STOP GOTO STOP
LCDINIT ;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
;
;XXXXXXXXX INITIALISE LCD XXXXXXXXXXXXXXXXXXXXXXXXXXXX
;
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CALL PDelay ;Let LCD power up.( > 15ms )
CALL PDelay
CALL PDelay
CALL PDelay
CALL PDelay
CALL PDelay
;**********************************************************
;8 BIT START INTIALIZATION - BY DEFAULT LCD STARTS IN 8 BIT
;BUSY CANNOT BE CEHECKED YET
;THESE COMMANDS ARE SENT AS INSTRUCTED BY DATASHEET
;***********************************************************
MOVLW B'00110000'
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL PDelay
CALL PDelay
MOVLW B'00110000'
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL PDelay
CALL PDelay
MOVLW B'00110000'
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL LCDBUSY ;NOW WE CAN CHECK BUSY
MOVLW B'00100000'
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
;**********************************************************
;END OF 8 BIT INITIALIZATION - SET-UP FOR 4 BIT
;**********************************************************
CALL LCDBUSY ;CHECK IF LCD IS BUSY
MOVLW B'00100000' ;FUNCTION SET #1
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW B'10000000' ;FUNCTION SET #2
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL LCDBUSY
MOVLW B'00000000' ;DISPLAY/CURSOR ON #1
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW B'11110000' ;DISPLAY/CURSOR ON #2
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL LCDBUSY
MOVLW B'0000000' ;CLEAR SCREEN #1
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW B'00010000' ;CLEAR SCREEN #2
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
CALL LCDBUSY
MOVLW B'00000000' ;ENTRY SET - INCREMENT,NO DISP SHIFT(CUR SHIFT) #1
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW B'01100000' ;ENTRY SET - INCREMENT,NO DISP SHIFT(CUR SHIFT) #2
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
RETURN ;END OF INITIALISE
LCDOUT ;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
; This routine sends the data out to the LCD
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
;FIRST SEND UPPER NIBBLE
movwf STORE ;Store data
CALL LCDBUSY
movf STORE,w
andlw B'11110000' ;mask off lower bits
MOVWF PORTB
BSF PORTB,RS
BCF PORTB,RW
BSF PORTB,E
BCF PORTB,E ;lower sent
;NOW SEND LOWER LOWER NIBBLE TO LCD
SWAPF STORE,F
movf STORE,W
andlw B'11110000'
movwf PORTB
BSF PORTB,RS
BCF PORTB,RW
BSF PORTB,E
BCF PORTB,E
RETURN ;DATA SENT
LCDBUSY ;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
; READ BUSY
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
BSF STATUS,RP0 ;SELLECT BANK 1
MOVLW B'11110000' ;SET RB7-RB4 INPUT
MOVWF TRISB
BCF STATUS,RP0 ;SELLECT BANK 0
BSF PORTB,RW
BCF PORTB,RS
BSF PORTB,E
MOVF PORTB,W ;READ
BCF PORTB,E ;1 CYCLE complete
BSF PORTB,RW
BCF PORTB,RS
BSF PORTB,E
NOP ;DO NOTTHING COZ BUSY FLAG IS IN FIRST NIBBLE
BCF PORTB,E ;2nd CYCLE complete
ANDLW 0x80
BTFSS STATUS,Z ;CHECK BUSY
GOTO LCDBUSY ;LOOP IF BUSY
BCF PORTB,RW
BSF STATUS,RP0 ;NOT BUSY SO MAKE PORTB O/P
MOVLW 0x000
MOVWF TRISB
BCF STATUS,RP0
RETURN
LINE2 ;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
; SET LCD TO WRITE ON LINE 2
;XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
CALL LCDBUSY
movlw 0xC6
; MOVLW B'10100000'
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW 0x08
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
RETURN
line3
CALL LCDBUSY
movlw 0x94
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW 0x08
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
return
curhom
; movlw 0x02
CALL LCDBUSY
movlw 0x02
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
MOVLW 0x08
MOVWF PORTB
BSF PORTB,E
BCF PORTB,E
return
displaytime
movf hour_hi,0
; movwf count3
call LCDOUT
movf hour_lo,0
; movwf count3
call text
call LCDOUT
movlw 0x0a
call LCDOUT
; movwf count3
call text
call LCDOUT
movf min_hi,0
; movwf count3
call text
call LCDOUT
movf min_lo,0
; movwf count3
call text
call LCDOUT
movlw 0x0a
; movwf count3
call text
call LCDOUT
movf sec_hi,0
; movwf count3
call text
call LCDOUT
movf sec_lo,0
; movwf count3
call text
call LCDOUT
return
displaytext
;bsf glatch
call line3
movlw 0x12
call LCDOUT
movwf count4
movlw 0x0b
CALL LCDOUT
movwf count3
text
movlw 0x03
movwf PCLATH
movf count3,W
addwf PCL,F
retlw 0x30 ;0
retlw 0x31 ;1
retlw 0x32 ;2
retlw 0x33 ;3
retlw 0x34 ;4
retlw 0x35 ;5
retlw 0x36 ;6
retlw 0x37 ;7
retlw 0x38 ;8
retlw 0x39 ;9
retlw 0x3a ;:
retlw 0x20
retlw 0x46 ;F
retlw 0x49 ;I
retlw 0x53 ;S
retlw 0x48 ;H
retlw 0x20 ;Space
retlw 0x46 ;F
retlw 0x45 ;E
retlw 0x45 ;E
retlw 0x44 ;D
retlw 0x45 ;E
retlw 0x52 ;R
retlw 0x21 ;!
retlw 0x21 ;!
retlw 0x20 ;Space
udelay ; delay W * 100 usec
movwf dcnt0
udelay0 movlw 8 * mhz
movwf dcnt1
udelay1 decfsz dcnt1, F
goto udelay1
decfsz dcnt0, F
goto udelay0
return
lcd_data
nop
bsf PORTA,0
nop
movwf PORTB
nop
;bsf PORTA,3
bcf PORTA,1
nop
nop
bsf PORTA,1
nop
nop
bcf PORTA,1
nop
nop
; bcf PORTA,3
call delay5
;bcf lcd_rw
;nop
;bsf lcd_rs
;nop
;movwf PORTB
;nop
;bsf glatch
;bcf lcd_e
;nop
;nop
;bsf lcd_e
;nop
;nop
;bcf lcd_e
;nop
;nop
;bcf glatch
;call delay5
return
;-------------------------------------------------------------
; 3 Millisecond Delay
;-------------------------------------------------------------
PDelay movlw .4 ; 1 set number of repetitions (B)
movwf PDel0 ; 1 |
PLoop1 movlw .186 ; 1 set number of repetitions (A)
movwf PDel1 ; 1 |
PLoop2 clrwdt ; 1 clear watchdog
decfsz PDel1, 1 ; 1 + (1) is the time over? (A)
goto PLoop2 ; 2 no, loop
decfsz PDel0, 1 ; 1 + (1) is the time over? (B)
goto PLoop1 ; 2 no, loop
PDelL1 goto PDelL2 ; 2 cycles delay
PDelL2 clrwdt ; 1 cycle delay
return ; 2+2 Done
;-------------------------------------------------------------
ENDcan anyone help me?? i am going to present this one this coming wednesday.. and it still not working.. im really having a hard time with this one...
Last edited:
