lcd2.asm

Library for the 8051 microcontroller. such as math routine, hexBCD, LCD, Keyboard, I2C, Remote, Ke

                ORG 0000H
                LJMP MAIN
                ORG 0030H
		RS EQU P3.5
		RW EQU P3.4
		EN EQU P3.7
                                    	;initialization
MAIN:           MOV A,#038H     	;first time
                LCALL COM
                MOV A,#038H             ;second time
                LCALL COM
                MOV A,#038H             ;third time
                LCALL COM
                MOV A,#038H             ;fourth time
                LCALL COM
                MOV A,#00CH
                LCALL COM
                MOV A,#001H
                LCALL COM
                MOV A,#006H
                LCALL COM
                MOV A,#083H
                LCALL COM       	;initialization End
		;===========================================
                MOV A,#'D'     		;data to write on LCD
                LCALL DATAW
		LCALL DELAY
                MOV A,#'A'
                LCALL DATAW
		LCALL DELAY
                MOV A,#'R'     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'E'
                LCALL DATAW
		LCALL DELAY
		MOV A,#' '     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'D'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'E'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'V'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'I'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'L'
                LCALL DATAW		
		LCALL DELAY
		;===========================================
		MOV A,#0C1H
		LCALL COM
		;===========================================
		MOV A,#'A'     		;data to write on LCD
                LCALL DATAW
		LCALL DELAY
                MOV A,#'S'
                LCALL DATAW
		LCALL DELAY
                MOV A,#'I'     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'F'
                LCALL DATAW
		LCALL DELAY
		MOV A,#' '     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'A'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'L'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'I'
                LCALL DATAW
		LCALL DELAY
                MOV A,#' '     		
                LCALL DATAW
		LCALL DELAY
		;===========================================
		MOV A,#'R'     		;data to write on LCD
                LCALL DATAW
		LCALL DELAY
                MOV A,#'A'
                LCALL DATAW
		LCALL DELAY
                MOV A,#'J'     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'P'
                LCALL DATAW
		LCALL DELAY
		MOV A,#'U'     		
                LCALL DATAW
		LCALL DELAY
		MOV A,#'T'
                LCALL DATAW
		LCALL DELAY
		;===========================================
AGAIN:          SJMP AGAIN    		;endless loop
COM:            MOV P1,A   		;command write sequence
                CLR RS
                CLR RW
                SETB EN
		;LCALL TEST
		CLR EN
		LCALL DELAY
                RET
DATAW:          MOV P1,A   		;data write sequence
                SETB RS
                CLR RW
                SETB EN
                ;LCALL TEST
		CLR EN
		LCALL DELAY
                RET
DELAY:          MOV R6,#50    		;simple delay routine
HERE2:          MOV R7,#255  		;for 0.0124S or 124MS
HERE:           DJNZ R7,HERE
                DJNZ R6,HERE2
                RET
TEST:		JB P3.0,TEST
TEST2:		JNB P3.0,TEST2
		RET
                END