On Mon, 2005-04-25 at 12:12 -0700, Barry Gershenfeld wrote:
> All well and good but perhaps a complex way to explain, that i2c is 
> bidirectional and
> SPI is not.  SPI is a good old fashioned TTL-style hookup -- everything that
> is an output connects only to inputs, and all inputs and outputs stay that 
> way.  It's
> also why SPI has more wires, because there's a Data Out and an Data In.

Along with a CS for each device, making SPI VERY painful if you want to
use several devices. That said it is "simpler" due to the normally
single direction signals. TTYL

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