PIC18F4525 & LCD problem - external resonator ?

[Bruce]

Check the data sheet for this PIC. Several PORTB pins are analog intputs at power-up, and
you'll need to write to OSCCON to configure it for 8MHz internal.

The default value in OSCCON at reset is for 1MHz.

[aggie007]

Check the data sheet for this PIC. Several PORTB pins are analog intputs at power-up, and
you'll need to write to OSCCON to configure it for 8MHz internal.

The default value in OSCCON at reset is for 1MHz.

I have defined Port B as output port in my code by using TRISB=0.

And by using the command:
@_CONFIG_CONFIG1H_OSC_INTIO67_1H

the internal oscillator is working fine at 8 MHz.

The LCD is now displaying text messages, but when I try to display a numerical value of a variable or a constant, it doesnt show anythin as the screen remains blank.

Please Help !!







DEFINE OSC 8

'******Setting up the LCD display******

DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 1
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50


@_CONFIG_CONFIG1H_OSC_INTIO67_1H

TRISB=0 'Set Port B as output



PAUSE 1000

LCDOUT $FE, 1
LCDOUT "PIC - LCD Test "
LCDOUT $FE, $C0
STOP

[Raflex]

Hello, you need to use DEC command, for example:

b0 var byte

b0=100

loop:
LCDOut $fe, 1
LCDOut "LCD TEST" 'Display line1
LCDOut $fe, $c0 'Move to line 2
LCDOut Dec b0 'Display b0 on LCD
Pause 500 'Wait .5 second
goto loop

end

[Bruce]

OK. Sorry. You're probably right, but give this a shot just for the heck of it.;o}

1. Edit your 18F4525.INC file in your PBP directory. Change this line;
__CONFIG _CONFIG1H, _OSC_XT_1H

to this; __CONFIG _CONFIG1H, _OSC_INTIO67_1H

Save the file.

Note this line: __CONFIG _CONFIG3H, _PBADEN_OFF_3H saves you from having to
manually disable A/D for several PORTB pins. Just FYI.

2. Change your code to something like this;

DEFINE OSC 8

'******Setting up the LCD display******
DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 1
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50

'@_CONFIG_CONFIG1H_OSC_INTIO67_1H ; this does nothing & it is not a command

TRISB=0 'Set Port B as output
OSCCON = %01110010

a VAR BYTE

Loop:
  LCDOUT $FE,1,"PIC - LCD Test "
  PAUSE 1000  
  FOR a = 0 TO 255
   LCDOUT $FE, $C0," A = ", #a
   PAUSE 1000
  NEXT a
  GOTO Loop
  
  END

Does it work now?