Re: [Gumstix-users] i2c slave mode slow?

[DJ D. <dj...@de...>]

"Dave Hylands" <dhy...@gm...> writes:
> If you meant 4 bytes total, including the address, then that's 4 x
> 6250 = 25,000 bytes/sec = 225,000 bits/sec (there are 8 data bits and
> 1 ack bit per byte), which seems pretty respectible for a synchrnous
> API.

Nope, 4 bytes payload.  5 total.  There's about a 1 bit gap between
bytes, and 3-4 bits between packets.  Say, 55 bits with start and
stop.  The logic analyzer says the i2c clock is only 340KHz (about
6250 * 55).

The 100KHz clock is only 95.6KHz.