2x16 lcd not working with pic16f72

[vu2iia]

hi,

I am new to PBP, I have made small test board for testing my codes using pic16f72 and I have written following code to test 2x16 lcd but it doesnt seem to be working. All I see is black squares.

My test board with 16f628+lcd with default LCD wiring is working fine and I have tested my few codes On it.

COULD SOMEBODY PLS POINT OUT WHAT IS THAT I AM MISSING ?
************************************************** ******
'PIC16F72
DEFINE OSC 10 ' Set the Xtal frequency
TRISB=%00000011
TRISA=%00000000
' ** Declare LCDOUT Defines **

DEFINE LCD_DREG PORTB 'LCD data port
DEFINE LCD_DBIT 4 'LCD data starting bit 0 or 4
DEFINE LCD_RSREG PORTB 'LCD register select port
DEFINE LCD_RSBIT 2 'LCD register select bit
DEFINE LCD_EREG PORTB 'LCD enable port
DEFINE LCD_EBIT 3 'LCD enable bit
DEFINE LCD_BITS 4 'LCD bus size 4 or 8
DEFINE LCD_LINES 2 'Number lines on LCD
PAUSE 2000

MAIN:

LCDOUT $FE, 1 'LCD CLR
LCDOUT $FE, $80, " LINE 1 "
LCDOUT $FE, $C0, " LINE 2 "
PAUSE 100

GOTO MAIN

************************************************** ************
Thanks in advance
vu2iia

[Darrel Taylor]

PBP's default Oscillator config for the 16F72 is XT.

For 10mhz, you'll need HS.
<br>

[vu2iia]

THANKS DARREL YOU POINTED out THE RIGHT PROBLEM, LCD IS WORKING NOW


REGARDS
VU2IIA
www.vu2iia.blogspot.com

[manisg84]

I am also trying to progrma PIC16f72 with LCd jhd162A, but it is not working

here is my code, anybody suggest where i did the mistake. i am using 4mhz hs oscillator.

#include <P16f72.inc>
LCD_DATA EQU PORTC ; PORTC FOR LCD DATA PINS
LCD_CTRL EQU PORTB ; PORTB SFR register
TRISA EQU 85h ; TRISA SFR register
TRISB EQU 86h ; TRISB SFR register
TRISC EQU 87h ; TRISC SFR register
STATUS EQU 03h ; STATUS SFR register
PORTA equ 05

R1 EQU 21
R2 EQU 22

ORG 00
goto START

LDELAY
MOVLW .200 ; 250MS DELAY
MOVWF R2
LOOP3 MOVLW .250
MOVWF R1
LOOP4 NOP
NOP
DECFSZ R1, F
GOTO LOOP4
DECFSZ R2, F
GOTO LOOP3
RETURN
SDELAY
MOVLW .100 ; 250MS DELAY
MOVWF R2
LOOP1 MOVLW .250
MOVWF R1
LOOP2 NOP
NOP
DECFSZ R1, F
GOTO LOOP2
DECFSZ R2, F
GOTO LOOP1
RETURN
LCD_INIT
BCF LCD_CTRL,3
CALL LDELAY
MOVLW 0X38
CALL COMMAND
CALL LDELAY
MOVLW 0X0E
CALL COMMAND
CALL READY
MOVLW 0X01
CALL COMMAND
CALL READY
MOVLW 0X06
CALL COMMAND
CALL READY
MOVLW 0X81
CALL COMMAND
CALL READY
MOVLW A'M'
CALL DATADISPLAY
CALL READY
MOVLW A'O'
CALL DATADISPLAY
CALL READY
MOVLW A'N'
CALL DATADISPLAY
CALL READY
MOVLW A'I'
CALL DATADISPLAY
CALL READY
MOVLW A'C'
CALL DATADISPLAY
CALL READY
MOVLW A'A'
CALL DATADISPLAY
CALL READY
MOVLW 0X88
CALL COMMAND
CALL READY
MOVLW A'M'
CALL DATADISPLAY
CALL READY
MOVLW A'O'
CALL DATADISPLAY
MOVLW A'N'
CALL DATADISPLAY
CALL READY
MOVLW A'I'
CALL DATADISPLAY
CALL READY
MOVLW A'S'
CALL DATADISPLAY
CALL READY
MOVLW A'H'
CALL DATADISPLAY
CALL READY
MOVLW A'A'
CALL DATADISPLAY
CALL READY
MOVLW 0XC3
CALL COMMAND
CALL READY
MOVLW A'E'
CALL DATADISPLAY
CALL READY
MOVLW A'L'
CALL DATADISPLAY
CALL READY
MOVLW A'E'
CALL DATADISPLAY
CALL READY
MOVLW A'C'
CALL DATADISPLAY
CALL READY
MOVLW A'T'
CALL DATADISPLAY
CALL READY
MOVLW A'R'
CALL DATADISPLAY
CALL READY
MOVLW A'O'
CALL DATADISPLAY
CALL READY
MOVLW A'N'
CALL DATADISPLAY
CALL READY
MOVLW A'I'
CALL DATADISPLAY
CALL READY
MOVLW A'C'
CALL DATADISPLAY
CALL READY
MOVLW A'S'
CALL DATADISPLAY
RETURN
COMMAND MOVWF LCD_DATA
BCF LCD_CTRL,1
BCF LCD_CTRL,2
BSF LCD_CTRL,3
CALL SDELAY
BCF LCD_CTRL,3
RETURN
DATADISPLAY MOVWF LCD_DATA
BSF LCD_CTRL,1
BCF LCD_CTRL,2
BSF LCD_CTRL,3
CALL SDELAY
BCF LCD_CTRL,3
RETURN
READY BSF STATUS,5
MOVLW 0xFF
MOVWF TRISC
BCF STATUS,5
BCF LCD_CTRL,1
BSF LCD_CTRL,2
BACK BSF LCD_CTRL,3
CALL SDELAY
BCF LCD_CTRL,3
BTFSC LCD_DATA,7
GOTO BACK
BSF STATUS,5
MOVLW 00
movwf TRISC
BCF STATUS,5
RETURN

START BSF STATUS,5 ; Select Bank 1
MOVLW b'00000000' ; PORTA as output
MOVWF TRISA
MOVLW b'00000000'
MOVWf TRISB
MOVLW b'00000000'
MOVWF TRISC ; PORTC as output to LCD
BCF STATUS,5 ; Select bank0
CALL LCD_INIT
return

end

[Darrel Taylor]

... here is my code, anybody suggest where i did the mistake. ...

You didn't use PicBasic Pro ...