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Thread: I2C Question
www.piclist.com/techref/i2cs.htm?key=i2c
face picon face BY : Olin Lathrop email (remove spam text)



> Unfortunately I have never gotten reliable NACKs,
> most of my slaves never seem to NACK, which can be a pain since I can't
use
> that method to detect if they are there,

You should get a NACK if no slave is connected to the bus at all because the
passive pullups will pull the data line high.  Something is seriously wrong
if this is not what you're getting.  It's probably not wired right if you
are using the built in MSSP module, or you've got a bug if it's a manually
programmed interface.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spamolinspamembedinc.com, http://www.embedinc.com

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