<div><span class="gmail_quote">On 4/18/08, <b class="gmail_sendername">Shawn Rutledge</b> <<a href="mailto:shawn.t.rutledge@gmail.com">shawn.t.rutledge@gmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On Fri, Apr 18, 2008 at 12:06 PM, Michael Shiloh <<a href="mailto:michael@openmoko.org">michael@openmoko.org</a>> wrote:<br>
> > * for hacking purposes it would be good to document what other mfrs<br>> > chargers use and how easy they are to hack into moko fastchargers.<br>> > This should be a wiki page and community driven, of course, but you<br>
> > could get it jump-started with whatever info you have on this issue.<br>> > I, for one, have a small pile of motorola chargers with mini USB on<br>> > them that I'm more than willing to hack into moko fastchargers given<br>
> > some basic instructions.<br>><br>> Since I feel the utility of this isn't tremendous, I think my time is<br>> better spent elsewhere. However, if others want to do this, I would suggest<br>> you start your search at lady ada's forum where they discuss getting the<br>
> minty-boost charger to work with different models of iPod. That seems to be<br>> one of the most comprehensive discussions of USB charger identifications I<br>> have ever found. (If anyone knows of a similar, or better one, I would love<br>
> to hear about it.)<br><br>I would like to see the Motorola chargers working too, without having<br>to modify the charger. It seems that it's some other resistance,<br>maybe 200k. What is the tolerance? Does the Freerunner actually<br>
measure the resistance? If we modify the code to be more tolerant<br>(any resistance between 20K and 500K means a charger is being<br>detected, and 500mA should be OK, whereas if it's 47K we can charge at<br>1A) could the phone be distributed with this modification? Where is<br>
this code which does the measuring, is it the PMU firmware or it runs<br>on the main CPU?</blockquote>
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<div>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.</div>
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