LCD defines?

[Bruce]

Try this;

@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
@ __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_128_2H
@ __CONFIG _CONFIG4L, _LVP_OFF_4L

Define OSC 20 ' change to osc freq you use if different
Define LCD_BITS 4   ' 4-bit interface
Define LCD_LINES 2 ' 2 line LCD

' LCD should be connected as follows:
' LCD PIC
' DB4 PortA.0
' DB5 PortA.1
' DB6 PortA.2
' DB7 PortA.3
Define  LCD_DREG  PORTA
Define  LCD_DBIT  0

' RS PortA.4 (add 4.7K pullup resistor to 5 volts)
Define  LCD_RSREG  PORTA
Define  LCD_RSBIT  4

' E PortB.3
Define  LCD_EREG  PORTB
Define  LCD_EBIT  3

' RW Ground
' Vdd 5 volts
' Vss Ground
' Vo 20K potentiometer (wire wiper to Vo, adjust for contrast)
' DB0-3 No connect

Define LCD_COMMANDUS  2000 ' Adjust for slower LCD modules
Define LCD_DATAUS 50

ADCON1 = 7 ' portA digital

Pause 500 ' Wait for LCD to startup
loop: 
    Lcdout $fe, 1 ' Clear LCD screen
    Lcdout "Hello" ' Display Hello
    Pause 500 ' Wait .5 second

    Lcdout $fe, 1 ' Clear LCD screen
    Lcdout "World"
    Pause 500 ' Wait .5 second

    Goto loop ' Do it forever

[RUBiksCUbe]

I tried that code and I still only see the black boxes on the second row. Im going to check all of the connections and try a potentiometor on Vo

Edit:

The connections are all good and my contrast is fine without a potentiometor. I think my LCD might be dead, but Im not sure because the backlight works and I can see the boxes it displays.

[mister_e]

out of curiosity...
what kind of programmer do you use?
Are you sure your programmer software program the fuses to the PIC?

And... of course, is a simple LED blink work on all the pin you use???

[RUBiksCUbe]

Im using a JDM programmer (the one called "Serial Port Programmer - Socketed" at http://www.sparkfun.com/shop/index.p...=323317&cat=3&) and IC-Prog as my downloading program. I just tested the IO lines and they all work.

I have also tried the program on another PIC18F252 and I get the same results.

EDIT:

The LCDOut command is for 44780 controllers right??

[Dave]

RUBiksCUbe, If I may ask, What type of LCD display is it? Who makes it? Part number?

Dave Purola,
N8NTA

[Dwayne]

I Noticed that your comment was the black squares were on the second line... I also noticed the examples presented looked like they were all for the first line of your LCD.

1. Since you only have 1 line of squares on your LCD, then I would suspect your line 1 is bad... test another LCD.

2. If you want, try writing to your second line on your LCD...

I believe the command is a $C0?

Somthing like :
LCDOUT $FE,$C0,“Hello”

If this works on your second line... then you may have found your problem.

Dwayne

[RUBiksCUbe]

The LCD is a 16 character by 2 line display. Although it says "UNIQ/eVision" on the back, it has the part number GC-1602I1 Ver: C, which is a part number for Solomon Goldentek display company. They don't have the exact datasheet on their website, but the closest one they have is here: http://www.goldentek.com/english/pdf...B0SBL1B%20.pdf

I was told when I bought it (on ebay) that the display driver is 44780 compatible.

[RUBiksCUbe]

I put the LCDOUT $FE,$C0,“Hello” into the program but it did not work either. This LCD must be busted.