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Old 06-24-2003, 01:48 AM
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Default Re: regarding I2C protocols

> An empty frame is expressly forbidden in the specs. However, the logic
> still not hang up if such a condition should happen.

I feel it is a bit futile forbidding illegal events because sooner or later
they will happen either through bugs or malfunction.

Personally I would make my I2C slaves enter the idle state whenever they saw
a stop condition (legal or not). Seems a fair and simple way of entering
resetting slave state machines without sending any bytes, even if the spec
forbids it.

If it happens to be an illegal transition then the I2C spec does not oblige
me to do anything in particular, so I can keep my I2C slave logic simple. If
I had to implement things like roll-back after malformed messages, I might
need large n-byte roll-back buffers.

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