LCD contrast

[mister_e]

Hi robert,

If i refer to my, i'll get :

- 1 line contrast squares, 1 line blank, 1 line contrast squares, 1 line blank.

What is the difference between using a 4 bit bus vs an 8 bit bus? I am trying to use 8 bits 'cause, well I have them. I figured that 8 bits would either give faster communication or some other advantage.

i always use LCD in 4bit mode. This way you save I/O ( duh! ). It can be more faster... it has too but... who will see it??? i think nobody

Don't forget the LCD Defines... 4 lines and blah blah blah. Be sure you disable analog comparator and place pull-up on RA4 pin.

In my case i'll place all LCD pins on PORTB. The define lines will look something like this

'********************** Lcd pinout ******************************
'
'                  B0-B3 : Data port 
'                     B4 : Rs Bit              
'                     B5 : E Bit               
'
define LCD_DREG PORTB   ' Set data pin of LCD to
define LCD_DBIT 0       ' PORTB.0-PORTB.3
define LCD_RSREG PORTB  ' Set RS bit of LCD to
define LCD_RSBIT 4      ' PORTB.4
define LCD_EREG PORTB   ' Set E bit of LCD to
define LCD_EBIT 5       ' PORTB.5
define LCD_LINES 4