Am Donnerstag, 4. Januar 2007 09:09 schrieb Mike King:
> >
> > Am Donnerstag, 4. Januar 2007 07:30 schrieb Mike King:
> > > Let me repeat this. Upon seeing the secret command, the next call to
> > > a SET_CONFIGURATION will cause the BB to reset itself and actually change
> > > the device descriptor from indicating it uses the default power setting
> > > of
> > > 100ma to the high power setting of 500ma. I can't imagine this is a
> > > common
> > > way of handling multiple power requirements.
> >
> > No, this is atrocious.
> > There's another thing, I want you to test. Have you tested whether it is
> > necessary to issue the SET_CONFIGURATION? Will the device's battery
> > go flat if you just issue the secret command?
> >
> > Regards
> > Oliver
> >
>
> Oliver,
>
> I'll check tomorrow and see. Does HUB electronics include over-current
> sensing to detect that a device that says it wants 100ma is in fact
> attemping to draw 500ma ?
No, protection is per hub, not port.
We'll want to add a hook to usbcore to request additional power so you
don't overdraw a bus powered hub, but this is quite clean.
Regards
Oliver
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