cant get my Lcd to work using Pic18f452

[mister_e]

Black square could also mean that the LCD initialization haven't been done properly. Now why... maybe because the LVP mode is still enable, hence RB5 can't be used as a standard I/O. Make sure you disable it in your config fuses.

The deprecated stuff is just a warning. you can disable it

@ ERRORLEVEL -230

in your code or modify the 18F452.inc file in your PBP folder.

        NOLIST
    ifdef PM_USED
        LIST
        "Error: PM does not support this device.  Use MPASM."
        NOLIST
    else
        LIST
        LIST p = 18F452, r = dec, w = -311, w = -230, f = inhx32
        INCLUDE "P18F452.INC"   ; MPASM  Header
        __CONFIG    _CONFIG1H, _OSCS_OFF_1H & _XT_OSC_1H
        __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_128_2H
        __CONFIG    _CONFIG4L, _LVP_OFF_4L
        NOLIST
    endif
        LIST
EEPROM_START	EQU	0F00000h
BLOCK_SIZE	EQU	8

This have been corrected in V2.47.

[civicgundam]

thanks for the info.. one question on that though would it be that i would have to disable it from the trisb ?

[mister_e]

Trisb be will set the I/O as an input or output. LCDOUT will automatically do it for you as well, but even with it, if you didn't disable the LVP mode, it will not work.

Same rules apply with ADC, Comparator etc etc.

[civicgundam]

i could not access the inc file due to access is denied due to school computer. So i tried config 4l by the use of config4l= 0x81

; Default settings
; ================
KB_ROW = 4 ; 4 ROW keypad
KB_ROW_PORT = PORTC ; Keypad ROW on PORTC
KB_ROW_BIT = 0 ; ROW0 = PORTB.0
KB_COL = 4 ; 4 COL keypad
KB_COL_PORT = PORTC ; Keypad Col on PORTC
KB_COL_BIT = 4 ; COL0 = PORTB.4
DebounceDelay = d'200' ; debounce delay 200mSec
CONFIG4L =0x81

[Snap]

I had the same problem and it drove me crazy untill I turned the lcd off an noticed for a spit second my message appear. Really look at that contrast pin and make sure you can fade the boxes on and off. This might not be the solution but it was in my case.
Snap

[civicgundam]

im still trying to get the lcd to work.. i dont know how to configure the lpv to disable and i looked at the contrast and it was fine since i used someones else program using the same pic that im using which is the pic18f452 and it came out working just fine. Im up for anymore ideas or anwsers to solve the problem at hand

[mackrackit]

Read this, http://www.picbasic.co.uk/forum/showthread.php?t=543 it tells how to set the config fuses from inside the program. As mister_e points out in post #5 of that thread, you could still have problems. If you do it will be time to talk to your instructor.

Now about the contrast pin. You said that you are using the same PIC as someone else. Do you mean PIC or project board?

What happens when you adjust the pot tied to the LCD's contrast pin?

It could be either one, LVP or contrast. If it is the same program as your friend , was your friend using the school's system.

Let us know.

[mister_e]

Could be interesting to have your whole schematic.