Hello, Andre,

can you give links to this I2C monitor device? I wish I had such a monitor
months ago when having problems with I2C transmission!

Peter


Barry,

I use I2C monitor device to display every thing on the bus
It is ready sitting on my bench if you like I can check it for
you to see what is happening on the bus let me know if you are
interested. Scope is a good tool but not for I2C

Andre




-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Barry Gershenfeld
Sent: Friday, April 08, 2005 1:47 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] HELP WITH PIC I2C


>I am a new member in piclist and i have a problem.i want to send some
>data (one simple word or numbers) from my master  pic 16F876
>to another slave pic 16F876 using  I2C protocol .I have written some
code in
>assembly but it does not working right.I managed to transfer the
>address byte, i get the first ack,then i see the right data on the
>oscilloscope ,but i get a nack instead of ack and my next data don't go
on.
>any help would be accebtable with  regard
>ps:if you want to send you my code just tell me.i use mplab ide and
assembly.

I'm having a surprisingly hard time verifying this from the literature I

have here, but I believe that when reading from a slave, it is the
master 
that generates the ack bit.  It tells the slave when the it has read the

last byte.  So (if I'm right) make sure you have the master generating
this 
bit.  Also make sure your code doesn't check for something it isn't 
supposed to check for, else it would get stuck.

Barry



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