[Embedlets-dev] RE: JSIMM, TStik, Muvium (I2C?) SPI is *much* faster.

[Bruce B. <bb...@sy...>]

At 08:36 PM 6/25/2003 -0700, Ted Kosan wrote:
>James,
>
>What about using I2C for the communications channel on the JSIMM backplane?
>Since Ethernet is too expensive to implement at this low a level, it looks 
>like
>the multi-master I2C bus could serve as a 'poor man's ethernet'.

I2C is about 100 kbits (if memory serves), SPI can be a few MBits. If you 
have to pick a standard for speed SPI wins.

I2C can be multi-master or peer-peer though I've never seen an 
implementation. That's one advantage for it.

>My thought is that each muvium, TStik, JStamp and JStik that is plugged into
>the JSIMM backplane should be able to talk to each other as peers using the
>standard Java networking APIs.  Right from the start you have been supporting
>the idea of communicating with the muviums using either SLIP or PPP so 
>what are
>your thoughts on the feasibility of doing this over an I2C bus?

SPI is *much* faster on TINI, JStik, JStamp, etc.

Bruce


>Ted
>
>
>PS, here is some reference information on I2C and the JSIMM backplane:
>
>
>http://www.esacademy.com/faq/i2c/
>
>http://jsimm.com
>
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