PIC18F4525 & LCD simple code problem

[savnik]

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

DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 7
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 6
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2

DEFINE LCD_DBIT 4 Mean PORTB4-PORTB7
and you use the same pins for RSBIT 7 and EBIT 6

[aggie007]

DEFINE LCD_DBIT 4 Mean PORTB4-PORTB7
and you use the same pins for RSBIT 7 and EBIT 6

Savnik,

I didnt know that LCD_DBIT 4 means PORTB4-B7 ....I thought it just states the starting data bit for a 4 bit bus.....I was totally confused on this one !!

Thanks for pointing it out....I'll try to make this work now !!!

[BobK]

Hi Aggie,

There are more than enough posts on this forum that will help you work your way through just about anything you can think of. I'm not trying to chase you away but if you use the search facility on this forum you should have plenty of reading material that will get you going in no time. In fact I think there's almost enough here to write a book. What an idea!!!!! "USING PIC's WITH LCD DISPLAY". What an idea!!!!!

HTH,

BobK

[aggie007]

I tried all those things mentioned above - 20K pot for contrast, etc, etc.

But it still doesnt work !!

The LCD lights up...but doesn't display anything. The PIC is working fine by itself, I tested it. But its not communicating with the LCD. I think the problem has something to do with the clock/oscillator.

Do I need to connect an external resonator (20MHz) to the two OSC pins of the PIC ? If so, how do I do it ? Do I need to add something to my code ? How ?

Please help.