So here's the update on this...

Crystalfontz got me an older datasheet which corresponds to my LCD, =20
but that still has no CRC info, other than for the one-wire =20
temp-sensor operation (which I had previously bypassed as I was not =20
using that feature).  The newest datasheet has the CRC info, but there =20
are other changes that apparently don't apply to my LCD.

They provide a small executable that will let me control the LCD from =20
a PC, and show the bytes being sent.  That was some help but does not =20
always work.  Since some functions do work, it would seem that the =20
hardware is fine, so possibly still a CRC issue...?

I've read some of the info/links on how CRC's work, but not done =20
yet... time has been an issue lately.  What was originally intended to =20
be a quick and dirty way to spit out some debugging info while =20
learning to use an Arduino has become a bit more involved.  I tend to =20
get concerned when debugging adds enough of it's own code to =20
potentially cause it's own problems.  Crystalfontz hasn't yet =20
responded whether the CRC requirement can be disabled, but I'm so =20
leaning towards using a PIC to make a quick serial or I2C to LCD =20
interface.  I'll pick this up again in a couple weeks.

Cheers,
-Neil.






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