Charging Neo Freerunner via USB port

[Flemming Richter Mikkelsen]

On 4/18/08, Shawn Rutledge <shawn.t.rutledge at gmail.com> wrote:
>
> On Fri, Apr 18, 2008 at 12:06 PM, Michael Shiloh <michael at openmoko.org>
> wrote:
> > >  * for hacking purposes it would be good to document what other mfrs
> > >  chargers use and how easy they are to hack into moko fastchargers.
> > >  This should be a wiki page and community driven, of course, but you
> > >  could get it jump-started with whatever info you have on this issue.
> > >  I, for one, have a small pile of motorola chargers with mini USB on
> > >  them that I'm more than willing to hack into moko fastchargers given
> > >  some basic instructions.
> >
> >  Since I feel the utility of this isn't tremendous, I think my time is
> > better spent elsewhere. However, if others want to do this, I would
> suggest
> > you start your search at lady ada's forum where they discuss getting the
> > minty-boost charger to work with different models of iPod. That seems to
> be
> > one of the most comprehensive discussions of USB charger identifications
> I
> > have ever found. (If anyone knows of a similar, or better one, I would
> love
> > to hear about it.)
>
> I would like to see the Motorola chargers working too, without having
> to modify the charger.  It seems that it's some other resistance,
> maybe 200k.  What is the tolerance?  Does the Freerunner actually
> measure the resistance?  If we modify the code to be more tolerant
> (any resistance between 20K and 500K means a charger is being
> detected, and 500mA should be OK, whereas if it's 47K we can charge at
> 1A) could the phone be distributed with this modification?  Where is
> this code which does the measuring, is it the PMU firmware or it runs
> on the main CPU?


If you make this kind of modification, there is no use in the autodetection.
It is more safe to check for the 47k and the other values.
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