LCD defines?

[RUBiksCUbe]

Im using a PIC18F252 with a 16x2 LCD with a 44780 controller and I cant get LCDOut to work. I just get a row of black boxes on the second line of the LCD. Ive been using the basic MicroCode Studio example for an LCD display:

' LCD should be connected as follows:
' LCD PIC
' DB4 PortA.0
' DB5 PortA.1
' DB6 PortA.2
' DB7 PortA.3
' RS PortA.4 (add 4.7K pullup resistor to 5 volts)
' E PortB.3
' RW Ground
' Vdd 5 volts
' Vss Ground
' Vo 20K potentiometer (or ground)
' DB0-3 No connect

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

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

But it does not work. Do I need to define a bunch of "LCD_xxxx" things?

[Bruce]

Turn off A/D on portA.

ADCON1 = 7

[RUBiksCUbe]

I added ADCON1 = 7 right after I define OSC, but I still get the same results.

[mister_e]

you'll have to use those define to change PBP defaults.

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

' LCD should be connected as follows:
' LCD PIC
' DB4 PortA.0
' DB5 PortA.1
' DB6 PortA.2
' DB7 PortA.3
' RS PortA.4 (add 4.7K pullup resistor to 5 volts)
' E PortB.3
' RW Ground
' Vdd 5 volts
' Vss Ground
' Vo 20K potentiometer (or ground)
' DB0-3 No connect

DEFINE LCD_DREG PORTA
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTA
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 3
ADCON1=7

AND SINCE you use HS osc you'll have to add

Define OSC 20
or the right crystal speed at the top of your code under the fuse setting

[RUBiksCUbe]

Still not working. I have a 10 MHz resonator, so I added Define OSC 10 under the fuses. My code is now:

'@ INCLUDE "P18F252.INC" ; MPASM Header
@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
@ __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_128_2H
@ __CONFIG _CONFIG4L, _LVP_OFF_4L
Define OSC 10

DEFINE LCD_DREG PORTA
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTA
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 3
ADCON1=7

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

[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???

[G8RPI]

Hi,
Most of the intellegent LCD displays are very sensitive to static.
They are the only components I've used were I've had failures directly attributable it ESD.

Robert G8RPI.