4-line LCD Help - using PortA instead of B

[anj]

You didnt mention it soooo, Do you have a pullup resistor on RA4?
Read PICmicro MCU specific Issues in the manual ( sect 2.5.1 )

Andrew

[Tom Gonser]

Yes, 4.7k ohm on R4..

[mister_e]

i didn't have any of those LCDs in stock but, can you place a trim pot on Vo pin. or just tie it to ground to see if you get at least some black square on???

Some LCD may need to place unused data pin to ground. Refer to your datasheet for that.

try removing thos DATAUS COMMANDUS defines
try a 2 secondes startup delay

[NavMicroSystems]

PAUSE 2000
LCDOUT "Hello World"

[Ceug2005]

TOM
"3. VO (Variable) Operating voltage for LCD -> I have this pinned to 5V "
Try VO = GND

[Tom Gonser]

Here is the startup sequence for 4-bits for this LCD display..

I am going to try the POT on the VO line to see if that helps, but it has been at Vss and Vdd and nothing shows there.

I am not sure how to comply with the attached startup sequence however... Where do I send the bit? When?

[Tom Gonser]

... Hmmm Now, I've got a POT on the VO which allows me to vary the cells from white to black. Still no data.

Same goes for both of the LDCs I have here, so it must be something with the PIC's treatment of the PortA?

I moved to an 18F2525..