If the character count is always correct, but the characters are jibberish,
you might want to double check the code you use to get the two 4-bit nibbles
onto the I/O pins.  Are you sending the nibbles in the correct order, and
are you sure that the two nibbles are actually the upper and lower 4-bits of
the byte you wish to display?

The first time I got an LCD working, I had lots of trouble that I traced to
improper bit-shifting.

----- Original Message -----
From: "Robert Sochon" <goatpics@YAHOO.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 12, 2001 11:46 AM
Subject: [pic]: LCD mystery


> I have some code for 4 bit data transfer from Myke
> predko - its good code - ive got the delays right ( i
> think) but every time i turn the circuit on the
> display shows a different set of characters everry
> time.... nothing logical either just a set of junk!
>
> Any ideas?
>
> its menat to say hello world and occassionally shows
> the right number of characters.... but not always!  -
> no bust jumpers either
>
>
> Does anyone have a truly  bullet proff complete 4 bit
> routine? that doesnt use the busy flag...!
>
> THanks for all the help already - im slowly gettiong
> there - uphil struggle :)
>
> Cheers
>
> robert
>
> ps attached is asm file if anyone wants a look!
>
> ____________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk
> or your free @yahoo.ie address at http://mail.yahoo.ie

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads