OLED Charactor display interface

revenue · Joined: 18 Jan 2007 Posts: 7

does anyone know how to get a NHD-0220DZW-AG5 OLED display to work properly? I have a application that uses a standard LCD which works fine. but I want to start using the OLED display, however it works for a few seconds and then starts displaying junk. I have talked to support at Newhaven and they tell me I would need to insert more delay time in commands to the display. I would try to edit the LCD lib. functions, however I can't find them. Where are the LCD functions located? MSC.lib? LCD4.lib? or is there an existing lib for these displays?

Thanks for any help.

Steve - Virginia, USA

(BASCOM-AVR version : 2.0.7.6 )

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

you should use the busy pin by using/specifying the WR pin. See help for config lcdpin.

revenue · Joined: 18 Jan 2007 Posts: 7

I want to use this display on existing boards, the WR single is tied low.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

then you can use lcd4.lib as a sample.
this one uses a nibble so you might need to change it.

revenue · Joined: 18 Jan 2007 Posts: 7

Where are the default LCD functions located? are they in a lib file?

Thanks for your help.

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

they are not in a lib but dynamic generated (because there a lot of options)
the provided alternative libs can be modified.
essentially, it is simple :

there is the _Init_LCD: routine which must initialize the lcd

there is the _Write_lcd which will receive a value in R24

all other routines are optional.
when you make sure you save/restore registers you use you can even write the code in basic.

revenue · Joined: 18 Jan 2007 Posts: 7

Mark, Are there internal variables to reference the LCD port pins configuration that I can use in my OLED lib?

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Hello Revenue,

I have the same problem with the same display. I also have the R/W pin tied low on my boards. It took quite a bit of time for the problem to manifest itself - 3 weeks.

Did you find a solution? If so, can you share with me?

Thank you,
Tim