piclist 2001\01\30\132313a >
Thread: : i2c Master Timing Problems
face picon face BY : Olin Lathrop email (remove spam text)

> Anyway, the
> slave never gets an interrupt from this code.  The
> o-scope shows the same timing pattern as my successful
> bit-banging code, but the trailing edges of the MSSP's SCK
> line are close to the SDA transitions.  Don't think
> that makes a difference, but...

There is a bug in the MSSP where the master samples the ACK bit on the
falling instead of rising edge of SCK.  This can cause a race condition
where the master sees a NACK instead of ACK.  However, this bug shouldn't
keep the slave from seeing the address byte.

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

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Subject (change) : i2c Master Timing Problems

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