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lcd_interfacing.asm
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lcd_interfacing.asm
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LIST P=PIC18F452, F=INHX32,N=0, ST=OFF, R=HEX
config OSC=HS,OSCS=OFF,WDT=OFF, BORV=45, PWRT=ON, BOR=ON, DEBUG=OFF,LVP=OFF,STVR=OFF
#include<p18f452.inc>
ORG 0x1A
; RC0 --> RS=0/1 --> SendInstruction/SendData
; RC1 --> RW=0/1 --> Write/Read
; RC2 --> E=H->L --> EnableSignal(450ns)
CLRF TRISD
BCF TRISC,RC0
BCF TRISC,RC1
BCF TRISC,RC2
RCALL L_DELAY ; Long Delay
BCF PORTC,RC1 ; WriteMode
BCF PORTC,RC0 ; SendInstructions
; Set Interface Length (8-bit mode, 2lines, 5x7)
MOVLW b'00111000'
RCALL Send
; Enable Display/Cursor (Display On, Cursor On, CursorBlink On)
MOVLW b'00001111'
RCALL Send
LOOP
; -------------------------- Next Member (1) ------------------
RCALL CLEAR
BSF PORTC,RC0 ; SendData
MOVLW a'U'
RCALL Send
MOVLW a'm'
RCALL Send
MOVLW a'e'
RCALL Send
MOVLW a'r'
RCALL Send
; Move to next line
BCF PORTC,RC0 ; SendInstructions
MOVLW 0xC0
RCALL Send
BSF PORTC,RC0 ; SendData
MOVLW a'F'
RCALL Send
MOVLW a'A'
RCALL Send
MOVLW a'2'
RCALL Send
MOVLW a'1'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'B'
RCALL Send
MOVLW a'C'
RCALL Send
MOVLW a'E'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'0'
RCALL Send
MOVLW a'0'
RCALL Send
MOVLW a'8'
RCALL Send
RCALL L_DELAY
; -------------------------- Next Member (2) ------------------
RCALL CLEAR
BSF PORTC,RC0 ; SendData
MOVLW a'A'
RCALL Send
MOVLW a'b'
RCALL Send
MOVLW a'd'
RCALL Send
MOVLW a'u'
RCALL Send
MOVLW a'l'
RCALL Send
MOVLW a'l'
RCALL Send
MOVLW a'a'
RCALL Send
MOVLW a'h'
RCALL Send
; Move to next line
BCF PORTC,RC0 ; SendInstructions
MOVLW 0xC0
RCALL Send
BSF PORTC,RC0 ; SendData
MOVLW a'F'
RCALL Send
MOVLW a'A'
RCALL Send
MOVLW a'2'
RCALL Send
MOVLW a'1'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'B'
RCALL Send
MOVLW a'C'
RCALL Send
MOVLW a'E'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'0'
RCALL Send
MOVLW a'1'
RCALL Send
MOVLW a'2'
RCALL Send
RCALL L_DELAY
; -------------------------- Next Member (3) ------------------
BCF PORTC,RC0 ; SendInstructions
RCALL CLEAR
BSF PORTC,RC0 ; SendData
MOVLW a'T'
CALL Send
MOVLW a'a'
CALL Send
MOVLW a'l'
CALL Send
MOVLW a'h'
CALL Send
MOVLW a'a'
CALL Send
; Move to next line
BCF PORTC,RC0 ; SendInstructions
MOVLW 0xC0
RCALL Send
BSF PORTC,RC0 ; SendData
MOVLW a'F'
RCALL Send
MOVLW a'A'
RCALL Send
MOVLW a'2'
RCALL Send
MOVLW a'1'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'B'
RCALL Send
MOVLW a'C'
RCALL Send
MOVLW a'E'
RCALL Send
MOVLW a'-'
RCALL Send
MOVLW a'0'
RCALL Send
MOVLW a'2'
RCALL Send
MOVLW a'4'
RCALL Send
CALL L_DELAY
BRA LOOP
; ----------------subroutines--------------------
Send
MOVWF PORTD
RCALL PULSE
RCALL S_DELAY
RCALL S_DELAY
RETURN
S_DELAY
MOVLW b'00001000'
MOVWF T0CON
MOVLW 0x10
MOVWF TMR0H
MOVLW 0x50
MOVWF TMR0L
BCF INTCON,TMR0IF
BSF T0CON,TMR0ON
AGAIN BTFSS INTCON,TMR0IF
BRA AGAIN
BCF T0CON, TMR0ON
RETURN
L_DELAY
MOVLW b'00000100'
MOVWF T0CON
MOVLW 0x00
MOVWF TMR0H
MOVLW 0x00
MOVWF TMR0L
BCF INTCON,TMR0IF
BSF T0CON,TMR0ON
A2 BTFSS INTCON,TMR0IF
BRA A2
BCF T0CON, TMR0ON
RETURN
CLEAR
BCF PORTC,RC0 ; SendInstructions
; ClearScreen
MOVLW b'00000001'
RCALL Send
; Move cursor to home
MOVLW b'00000010'
RCALL Send
RETURN
PULSE ; H -> L
BSF PORTC,RC2
RCALL S_DELAY
BCF PORTC,RC2
RETURN
END