sorry, I'm a bit late into this discussion, but anyway.

I got some chinese RTB boards from ebay, that contain DS1307 and
24C32WP on them, and tried to check them via BusPirate.
When querying i2c addresses, it found just the eeprom, and not a RTC,
so it looks like it's stopping search when one device has responded.
Somehow I could talk to RTC for several times, after that it stopped respon=
ding.

Later I just wrote small JAL code and could access, read and write to
both chips, so they were fine.

I just wanted to say that BusPirate can make things even less clear:)

By the way, that RTC board with two chips is excellent tool to learn i2c.


>
> In that case a Bus Pirate will serve you especially well. Take anything
> I2C and query it for its address, poke commands at it, etc, from your
> computer.
>
> Bob




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KPL
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