LCD problem on portC

[BobSpencerr]

Hi,

I have had a 16x2 LCD display attached to a 16F877 to port A and is works just fine using the default settings for data port etc. The problem is that I have to move it to port C to allow me the use of the A2D converters on the chip. I have tried to assign the port and simply duplicated the wiring to the new pins (left the old ones attached for comparison reasons) but the display will not work.

Is this correct?

Portc.0 to portc.3 = data lines.
PortD.0 = RS
portD.1 = E

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

Why would this not work?

[mister_e]

unless you misswired smething, there's no reason

i just tried it here... work a treat.

[BobSpencerr]

Thanks Mr E.
Ill double check the wiring tonight but as I simply duplicated it from one port to another (and left the previous wires intact for checking against) I doubt that I miss-wired it.

I will check the connections with a cro tonight adn see if signals are getting out.

Did you do anything else (initialise the port or something)

[mister_e]

nope, just placed a PAUSE 500 before the first LCDOUT.

lucky guy you are, i still have what i used...


@ __CONFIG _XT_OSC & _LVP_OFF
'
DEFINE LCD_DREG PORTC
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTD
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTD
DEFINE LCD_EBIT 1
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50

pause 500
lcdout $FE,1,"hello"
stop

[BobSpencerr]

Thanks,
Ill try again tonight.

[BobSpencerr]

Problem solved.
I moved it to another port.