Andreas Kostyrka wrote:
* Nikita V. Youshchenko <[EMAIL PROTECTED]> [070120 13:19]:
How can it charge over USB if it gets full discharged?
AFAIK, USB device is not powered by USB host until it is configured.
So gadged must be operational to charge over usb.
Well, I'm almost certain that my USB mouse has no battery builtin, so
I guess USB does provide some minimal power to enable configuration.
Sure.
That depends on how usb client hardware is done.
In your mouse, there is microcontroller that controls usb client
functionality, and powers itself from usb (yes usb gives some limited
power - up to 100 mA if I remember correctly - even to client which is not
configured yet.
But in case when USB is controlled by Linux USB Gadget driver, central CPU
must be operational and kernel up and running for USB client functionality
to work.
That depends upon how clever the USB port hardware is, I'd guess.
Soft is Linux kernel in my case.
And yes, it can't charge over usb until it is up.
I know, I've owned an iPaq with GPE once with that characteristic too ;)
My Motorola V3 had the same problem... I could not let it 'die' or I
would need to use the power outlet adapter to charge it :S
It was a very annoying feature, speccially while traveling... it's a lot
easier to carry a mini usb cable than the adapter and the cable can be
used for many other things, from web cams to IP phones etc...
Sergio Bessa
Andreas
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