USB keyboard in hostmode?

Al Johnson openmoko at
Thu Aug 21 19:22:49 CEST 2008

On Thursday 21 August 2008, Geoff Ruscoe wrote:
> On Wed, Aug 20, 2008 at 3:27 PM, Jay Vaughan <jayv at> wrote:
> > > Do you have a source for this info? The only need for external
> > > components that
> > > I'm aware of is the 15k pulldowns when charging while in host mode.
> >
> > About two years ago I was working on getting USB Host mode working
> > "out of the box" on the GP2X, and I ran into this problem - the
> > missing cap/resistor combo meant that the USB Host controller
> > interface wasn't able to accurately determine what sort of node it was
> > communicating with, and thus the onboard Linux driver tried to treat
> > it as a hub node when it was really just a 'terminal' node.  I don't
> > have a reference for you on this, just going by memory ..
> Can we have a keyboard with that includes batteries and supply juice to the
> freerunner while in host mode?  That way when using the builkier setup with
> the keyboard plugged into the usb, it could be charging the freerunner?  Or
> are the host mode / charging mode multually exclusive?

You are essentially describing a variation on the three headed cable described 
in the wiki. A similar suggestion that has I think been done it to modify a 
battery powered hub to provide power to the Neo while it's in host mode.

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