Re: Any experiences with power hungry USB devices?
On Friday 29 August 2008 11:17:20 pm Michael Shiloh wrote: > I'm working on documenting various aspects of our USB port. > > We believe that the FreeRunner USB port should be capable of delivering > the standard USB high current of 500mA. We also believe that we respond > properly to USB negotiation of this current, up from the minimum of 100mA. > > I suddenly remembered that someone posted about using a USB keyboard > that didn't work due to high current. However, the FreeRunner should be > able to provide exactly as much current as a desktop PC, which I assume > works with this keyboard. I have a USB keyboard (EMPREX 5139U) which, with the 2007.2 (I think), the LEDs would not light up, but I could use it on the console (and not in X, but due to other things). It works fine with my PC, and with the FR now that I'm running Debian (though it doesn't keep the FR from dimming the screen). Eli --. "If it ain't broke now, Eli Carter \ it will be soon." -- crypto-gram [EMAIL PROTECTED] `- ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Any experiences with power hungry USB devices?
On Sat, Aug 30, 2008 at 6:17 AM, Michael Shiloh <[EMAIL PROTECTED]> wrote: > I'm working on documenting various aspects of our USB port. > > We believe that the FreeRunner USB port should be capable of delivering > the standard USB high current of 500mA. We also believe that we respond > properly to USB negotiation of this current, up from the minimum of 100mA. > > I suddenly remembered that someone posted about using a USB keyboard > that didn't work due to high current. However, the FreeRunner should be > able to provide exactly as much current as a desktop PC, which I assume > works with this keyboard. > > If any of you have experienced difficulty with the FreeRunner powering > USB devices, please speak up. > > Michael > > ___ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > I had no problem with this. I only tested it with a controller, but it used more than 100mA (+/- 200mA). y ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
