Jinx wrote:
> I confirmed what I was seeing with the
> analyser by having the 452 echo any slave ACKs it saw to one its pins

Yes, but what were you seeing on the analyser?  From what you are saying,
the first thing that goes wrong is an ACK is missed.  Do you see this ACK on
the bus?  It would be important to know whether the slave is failing to ACK,
or the master is failing to see the ACK.


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