[IPython-User] Ipython for Angstrom

Fernando Perez fperez.net@gmail....
Wed Sep 8 00:49:02 CDT 2010


On Tue, Sep 7, 2010 at 8:09 PM, Ryan Krauss <ryanlists@gmail.com> wrote:
> Thanks.  Yea, I eventually got IPython to run on the BeagleBoard
> without a problem.
>
> But we hit a roadblock with deadtime in between serial transmissions.
> My work at this point depends on being able to send 5-10 bytes of data
> back and forth to a microcontroller that is doing real-time control
> with update frequencies of 500-1000 Hz.   We are running a test where
> we just echo data back and forth with the micro to test the loop time.
>  We were hoping that the BeagleBoard would be an improvement over a
> laptop mainly because there is less stuff going on and more control
> over the hardware.  It hasn't worked out yet.  And we have struck out
> with several approaches to reducing the deadtime.  The PC just seems
> to sit there doing nothing.  The annoying thing is that windows can
> run the code with 500 Hz update frequencies without a problem.  We
> haven't found a linux approach that can do better than around 250 Hz.

Bummer!  I imagine you've tried all the obvious using the various
approaches to real-time kernels.  250Hz sounds like a very low rate
for a modern machine...

Cheers,

f


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