Mark Hanchey wrote:
> It turned out not to be a problem with the demo code drawing routines=20
> but was a simple error on my part.
> I wasn't used to the pic 18lf45k22 and didn't realize that on it PortD,=20
> the port I used for my data lines , are used for analog ports 20-27. All=
=20
> the pics I used previously were smaller chips and only had ports A-C,=20
> with port B being the main analog ports. Adding one line to the program=20
> fixed the issue ,  ANSELD=3D0 . Foolish me, but now I know to read the=20
> datasheet more thoroughly.   I still wonder what was going on=20
> electronically to make every 8th pixel show , if anyone can explain why=20
> leaving analog on with the data pins caused every 8th pixel I would be=20
> interested in knowing.
>
> Thanks for all the suggestions and maybe this will help someone else out=
=20
> of this awkward error.
> Mark
>
>  =20
Setting an I/O bit involves a read/modify/write of the entire port. =20
When a pin is set to analog, reading the pin returns a 0, regardless of=20
the setting of the pin.  So if portb is set to all analog, then=20
PORTB.7=3D1 will set pin 7 to 1, but a subsequent PORTB.6 will set pin 6=20
to 1 and will set pin 7 to 0.

Is that what you were seeing?

Kerry

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.