Re: [Gumstix-users] gumstix I2c 400 khz ??

[<tat...@ya...>]

Hi Chris.

I'm in the same problem with Jakob.

I store the date which is converted by AD converter in robostix.That size is 128×3 Byte. And then send it to gumstix.

But compared to the time which is cost to process the data in gumstix, the time which is cost to transfer data is very unaccessable.

So if you know the way to change I2C to 400 kHz clock mode, Please teach us.


Chris Danis <cg...@co...> wrote: On 12/11/06, Jakob Bj娼フrn  wrote:
> I am currently working on a small toy helicopter (Draganflyer), on
> this we have put a gumstix/robostix pack.  We have some sensor data on
> the on the Robostix, and from a ultra sonic range finder (SRF08), that
> we need to relay to the gumstix in the fastest manner possible. All
> our UART connections are used, so the I2C connection is the only one
> left.
>
> I have made it work with 100 kHz clock, but I would like to run 400
> kHz. I have checked  that all the devices should be able to handle the
> 400 kHz clock.  In the setup the Gumstix is the Master.

Jakob,

The SRF08, in its default configuration, takes 65 milliseconds to
complete a ranging operation.  Are you sure you really need the
reduction in data transfer latency you'll get by going to a 400kHz
clock?  The delay imposed by the sensor itself is much larger.

best,
-chris

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