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Pic18f4550 adc

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Thanks for your reply Ian Rogers.

What is your opinion about the saved settings mentioned in post number 116 ? is it ok to save them in registers?
 
Hi,

At the moment i am using the coding below for the LCD:

Code: 
	COUNT1        EQU 60H
	COUNT2        EQU 61H
    COUNT3        EQU 62H
	TABLE_TEMP    EQU 63H
	TABLE         EQU 64H


 
	ORG 0000H


	;INITIALIZATION
 
	MOVLW 0FH			;INITIALIZE ALL PORTS AS DIGITAL INPUTS
	MOVWF ADCON1
 
	MOVLW 07H			;CONFIGURE COMPARATORS FOR DIGITAL INPUTS
	MOVWF CMCON	
 
	CLRF TRISB
	CLRF PORTB
 
	MOVLW B'00000000'	;PORTD IS CONFIGURED AS OUTPUTS
	MOVWF TRISD 
	CLRF LATD
	CLRF PORTD
 





MAIN
 
 	CALL LONG_DELAY      ;DELAY USED AT START-UP TILL SUPPLY REACHES FULL VOLTAGE
 
FUNCTION_SET
 
	BCF PORTB,5		     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	       	 ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
 
	MOVLW B'00111100'    ;SET LCD TO 8 BIT INTERFACE, SET TO 4 LINE MODE, 5x7 DOT FORMAT.  (SEE 'CONTROL CODES TABLE' IN LCD DATASHEET FOR REFERENCE)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY

 
DISPLAY_ON

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
	MOVLW B'00001100'    ;TURN DISPLAY ON, CURSOR UNDERLINE OFF, CERSOR BLINK OFF.   (SEE 'CONTROL CODES TABLE' IN LCD DATASHEET FOR REFERENCE) 
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY


    MOVLW B'10000011'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 
	CLRF TABLE           ;CLEAR THE TABLE REGISTER TO BE ON THE SAFE SIDE
 

MESSAGE

	MOVF TABLE,W		;MOVE THE VALUE OF Wreg TO TABLE. THIS IS DONE TO INCREMENT THE POINTER 
	CALL TEXT           ;CALL TEXT ROUTINE
	ANDLW 0FFH		    ; Check for NULL 
	BTFSC STATUS,2      ;ARE ALL CHARACTERS DISPLAYED...
   ;GOTO SEND	  	    ;...IF YES, GO TO THIS LABEL WHEN THE CHARACTERS ARE ALL DISPLAYED
    GOTO DISPLAY_VALUE  ;USE THIS INSTRUCTION IF A VALUE NEEDS TO BE DISPLAYED. IF NOT, REMOVE THIS INSTRUCTION AND USE THE ONE ABOVE (I.E. GOTO SEND)
	BSF PORTB,5		    ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	        ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	MOVWF PORTD	     	;MOVE THE CHARACTER TO THE LCD
	CALL PULSE_E        ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY    ;SMALL DELAY WHILE LCD IS BUSY
	INCF TABLE,F        ;INCREMENT THE TABLE REGISTER TO MOVE TO NEXT CHARACTER
	GOTO MESSAGE        ;GO BACK TO MASSAGE LABLE TO DISPLAY NEXT CHARACTER
 
 
TEXT

	MOVWF TABLE_TEMP   ;MOVE THE VALUE OF Wreg TO TABLE_TEMP REGISTER
	BCF STATUS,0       
	RLCF TABLE_TEMP,F				
	MOVLW HIGH(mess) 	; Get High address
	BTFSC STATUS,0	; If > 255				
	INCF WREG,W		
	MOVWF PCLATH
	MOVLW LOW(mess)	 ; Get low address			
	ADDWF TABLE_TEMP,W	; add message pointer
	BTFSC STATUS,0	; if > 255			
	INCF PCLATH,F
	MOVWF PCL

				
mess 

	
	RETLW 'T'
	RETLW 'e'
	RETLW 's'
	RETLW 't'
	RETLW 0H


DISPLAY_VALUE

    MOVFF VALUE,PORTD     ;MOVE THE VALUE OF REGISER 'VALUE' TO THE DATA PORT (PORTD)
    CALL SMALL_DELAY      ;SMALL DELAY WHILE LCD IS BUSY
    CALL PULSE_E          ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
    CALL SMALL_DELAY      ;SMALL DELAY WHILE LCD IS BUSY
    GOTO SEND             ;GO TO THIS LABEL WHEN FINISHED
 
PULSE_E

	BSF PORTB,7
	NOP
	BCF PORTB,7
	RETURN
 
 
 
LONG_DELAY

	MOVLW	.2
	MOVWF	COUNT1
    MOVLW	.69
	MOVWF	COUNT2
	MOVLW	.169
	MOVWF	COUNT3
loop		
	DECFSZ	COUNT3
	GOTO	loop
	DECFSZ	COUNT2
	GOTO	loop
	DECFSZ	COUNT1
	GOTO	loop
	RETURN
 
 
 
SMALL_DELAY

	MOVLW .10
	MOVWF COUNT2
LABEL2
	CLRF COUNT1
LABEL1
	DECFSZ COUNT1
	GOTO LABEL1
	DECFSZ COUNT2
	GOTO LABEL2
	RETURN
 
SEND
 
GOTO $		; THIS WILL STOP THE MICRO FROM STARTING TO EXECUTRE THE PROGRAME AGAIN EVEN AFTER
			; SENDING IT TO THE END DIRECTIVE
 
END

Is there a way to eliminate the TEXT routine and do if similar to the coding in the file attached (experiment 8) ??
 

Attachments

  • lcd2.pdf
    121.5 KB · Views: 180
Last edited:
Hi,

I cannot understand the coding of that forum, but now i did another setup (coding below) which is much easier for me to understand. Is it structured correctly?? I think by far this is the best setup that i can find since much of the coding is done once and then all you have to write is " MOVLW 'C' .... CALL SEND_CHAR".

Code: 
	COUNT1        EQU 60H
	COUNT2        EQU 61H
    COUNT3        EQU 62H
	TEMP_CHAR     EQU 63H
	


 
	ORG 0000H


	;INITIALIZATION
 
	MOVLW 0FH			;INITIALIZE ALL PORTS AS DIGITAL INPUTS
	MOVWF ADCON1
 
	MOVLW 07H			;CONFIGURE COMPARATORS FOR DIGITAL INPUTS
	MOVWF CMCON	
 
	CLRF TRISB
	CLRF PORTB
 
	MOVLW B'00000000'	;PORTD IS CONFIGURED AS OUTPUTS
	MOVWF TRISD 
	CLRF LATD
	CLRF PORTD
 



MAIN
 
 	CALL LONG_DELAY      ;DELAY USED AT START-UP TILL SUPPLY REACHES FULL VOLTAGE
 

;FUNCTION SET
 
	BCF PORTB,5		     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	       	 ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
 
	MOVLW B'00111100'    ;SET LCD TO 8 BIT INTERFACE, SET TO 4 LINE MODE, 5x7 DOT FORMAT.  (SEE 'CONTROL CODES TABLE' IN LCD DATASHEET FOR REFERENCE)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY

 
;DISPLAY ON

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
	MOVLW B'00001100'    ;TURN DISPLAY ON, CURSOR UNDERLINE OFF, CERSOR BLINK OFF.   (SEE 'CONTROL CODES TABLE' IN LCD DATASHEET FOR REFERENCE) 
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY


;LCD LOCATION

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11010011'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY





 
	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW 'A'
    CALL SEND_CHAR

    MOVLW 'B'
    CALL SEND_CHAR

    MOVLW 'C'
    CALL SEND_CHAR

    MOVLW 'D'
    CALL SEND_CHAR

    MOVLW 'E'
    CALL SEND_CHAR

    MOVLW 'F'
    CALL SEND_CHAR

    MOVLW 'G'
    CALL SEND_CHAR

    MOVLW 'H'
    CALL SEND_CHAR

    MOVLW 'I'
    CALL SEND_CHAR

    MOVLW 'J'
    CALL SEND_CHAR

    MOVLW 'K'
    CALL SEND_CHAR

    MOVLW 'L'
    CALL SEND_CHAR

LINEEE
BRA LINEEE
   





SEND_CHAR

    MOVWF TEMP_CHAR
    MOVFF TEMP_CHAR,PORTD
    CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

RETURN


CLEAR_LCD

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
	MOVLW B'000000001'    ;TURN DISPLAY ON, CURSOR UNDERLINE OFF, CERSOR BLINK OFF.   (SEE 'CONTROL CODES TABLE' IN LCD DATASHEET FOR REFERENCE) 
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY
	CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

RETURN


PULSE_E

	BSF PORTB,7
	NOP
	BCF PORTB,7
	RETURN
 
 
 
LONG_DELAY

	MOVLW	.2
	MOVWF	COUNT1
    MOVLW	.69
	MOVWF	COUNT2
	MOVLW	.169
	MOVWF	COUNT3
loop		
	DECFSZ	COUNT3
	GOTO	loop
	DECFSZ	COUNT2
	GOTO	loop
	DECFSZ	COUNT1
	GOTO	loop
	RETURN
 
 
 
SMALL_DELAY

	MOVLW .10
	MOVWF COUNT2
LABEL2
	CLRF COUNT1
LABEL1
	DECFSZ COUNT1
	GOTO LABEL1
	DECFSZ COUNT2
	GOTO LABEL2
	RETURN
 
SEND
 
GOTO $		; THIS WILL STOP THE MICRO FROM STARTING TO EXECUTRE THE PROGRAME AGAIN EVEN AFTER
			; SENDING IT TO THE END DIRECTIVE
 
END
 
You can do it that way.... As your program expands, and your knowledge increases.. You will be looking for more efficient string routines.

But! You can do it however you like..... Printing the decimal is next..Did you get your head around the bin2bcd routine in the code I sent you?
 
Like I said earlier in this thread... A pic18 series of processor can have up to 16 nested calls... A nested call is when you call..say.. writelcd then writelcd calls pusleE.

an example

main code loop

call function 1 /// address has to be remembered to return back here (stack increased )

end main

function 1

call function 2 /// address has to be remembered here as well (stack increased)

end function 1

so on and so on.

There are 16 possible stack positions, so in theory 16 nested calls......HOWEVER.. If you use interrupts, an interrupt needs two stack positions, so in reality only 14 nested calls can be made.
 
Hi,

How can i display the highlighted character in the attached pic? and is it possible to clear a single row from the LCD instead of clearing all rows?
 
Hi,

Nothing is being displayed when i write b'00010000'.
Can it be that i have to change the ROM address since that character is in ROM code A02.

Attached is the datasheet.

Thanks
 
That LCD hasn't got them characters..... You can make them though.... you need to write to DDram, The datasheet points you in the right direction... the first 8 characters are yours to control. You need to send all the bytes to the ddram (there are 64 of them).. the first 3 bits are lost so define the chars to the left..
 
Last edited:
Hi,

Thanks for your reply.

At the moment i am trying to program the menu arrow (pointer), but im finding difficulties. For some reason it is not working. Does anyone knows what is wrong with the coding please?
Code: 
LINE6_LCD_MENU

BTFSC PORTB,1                       ;CHECK DOWN SW
GOTO DOWN_MENU_ARROW  ;IF PRESSED, MOVE ARROW DOWN AND INCREMENT THE MENU_ARROW REGISTER
BTFSC PORTB,2                       ;CHECK UP SW
GOTO UP_MENU_ARROW        ;IF PRESSED, MOVE ARROW UP AND DECREMENT THE MENU_ARROW REGISTER
BRA LINE6_LCD_MENU           ;IF NONE OF THE SWITCHES IS PRESSED, GO TO LINE6_LCD_MENU






DOWN_MENU_ARROW              ;MOVE ARROW DOWN

INCF MENU_ARROW                 ;INCREMENT THE MENU_ARROW REGISTER TO INDICATE THE LOCATION OF THE ARROW

MOVLW MENU_ARROW            ;MOVE THE VALUE TO THE WORKING REG
SUBLW .3                                ;SUB BY 3
BTFSS STATUS,Z                      ;SKIP IF RESULT NOT = 0
CALL LCD_ARROW_1              ;IF EQUAL TO 0, DISPLAY ARROW IN ROW 1

MOVLW MENU_ARROW
SUBLW .2
BTFSS STATUS,Z
CALL LCD_ARROW_3

MOVLW MENU_ARROW
SUBLW .1
BTFSS STATUS,Z
CALL LCD_ARROW_2
 
Hi, can someone help me with the coding below please.

In the coding i am putting a value (in this case 1 decimal) in reg1 and then the program should go to different call routines according to the value in reg1.

For instance if the value in reg1 is 2, when subtracted be 2, the program is suppose to go to the LCD_ARROW_2 call routine.

Code: 
MOVLW .1                                    
MOVWF REG1


MOVLW REG1
SUBLW .3
BTFSS STATUS,Z
CALL LCD_ARROW_3

MOVLW REG1
SUBLW .2
BTFSS STATUS,Z
CALL LCD_ARROW_2

MOVLW REG1
SUBLW .1
BTFSS STATUS,Z
CALL LCD_ARROW_1
 
Hi,

When REG1 = 1 the program should go to the LCD_ARROW_1 routine.

The arrow routine is the one below:

Code: 
;DISPLAY FIRST ARROW

LCD_ARROW_1

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11000000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW '>'
    CALL SEND_CHAR

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'10010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR


	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR


RETURN




;DISPLAY SECOND ARROW

LCD_ARROW_2

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11000000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'10010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW '>'
    CALL SEND_CHAR


	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR

RETURN



;DISPLAY THIRD ARROW

LCD_ARROW_3

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11000000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR

	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'10010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW ' '
    CALL SEND_CHAR


	BCF PORTB,5	 	     ;R/S SET TO LOW TO INDICATE THAT DATA BELOW IS A COMMAND
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY   	 ;SMALL DELAY WHILE LCD IS BUSY
    MOVLW B'11010000'    ;SET THE LOCATION OF THE CHARACTERS. "0x80"= line1, "0xC0"= line2,  "0x90"= line3,  "0xD0"= line4. To set column increase the value (ex."0x82"= line1 column 2)
	MOVWF PORTD          ;SEND THE ABOVE COMAND TO THE LCD
    CALL PULSE_E         ;PULSE THE E PIN TO ENABLE COMMAND TO ENTER LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

 

	BSF PORTB,5	 	     ;R/S IS SET TO DATA TRANSFER
	BCF PORTB,6	         ;R/W SET TO LOW TO INDICATE THAT WRITE COMMAND TO LCD
	CALL SMALL_DELAY     ;SMALL DELAY WHILE LCD IS BUSY

    MOVLW '>'
    CALL SEND_CHAR


RETURN
 
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