Also might look at the following tutorial...

http://www.virtualbreadboard.com/READ/vbb/Help/Packages/PICMICROS/Tutorials/
Features/PIC16F87X/Tutorial%2019/Tutorial%2019.htm

James Caska
caska@virtualbreadboard.com



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of A.J. Tufgar
Sent: Friday, June 07, 2002 5:20 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Help with I2C.


Hello again all,
                Normally I don't ask for help with code I'd rather learn
from debugging myself, but this bug has me stumped.

I'm trying to communicate to a 24LC64 with a 16F84.  The 24LC64 works
fine and will acknowledge fine through the write cycle (if I switch the
address of the 24LC64 it will stop ack this leads me to beleive it
works).  However when I try to read back the data it won't let me.  If I
take out my stopbit routine I get some data back but it is incorrect.
If I leave in the stop bit it doesn't ack during a read routine.  Very
confusing.

Anyways here's my code I'm pretty sure the hardware is right as I seem
to be able to write to the device correctly.  I do have 10k pull-ups on
the I2C port and I'm using a 4MHz osc.

Also I realize in my read routine the data is backwards.  I'm trying to
get any data back period before inverting it (bit 7 is really bit 0).

Thanks,
A very desprate and irrate programmer.

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