How would you know which USB port you are using? Check your schematic against†http://www.gumstix.org/images/overo_signals_latest.pdf. If you are using the USBH_DP/DM pins they are high-speed only.

In a previous message you refer to USBH_VBUS so I suspect this is your issue. Either use a different USB hub or connect to the OTG port (assuming your kernel supports host mode there).

†- Juha


On Wed, Dec 19, 2012 at 10:12 AM, Eric Crossley <eric.crossley@jhuapl.edu> wrote:

Thanks, Juha.† How would I have known that?† I would say that is a problem.

Regards,

Eric Crossley
x80669
443-277-2880

From: Juha Kuikka [via Gumstix] [mailto:[hidden email]]
Sent: Wednesday, December 19, 2012 1:07 PM


To: Crossley, J. Eric
Subject: Re: Embedded USB hub

On Wed, Dec 19, 2012 at 9:34 AM, Eric Crossley <[hidden email]> wrote:

Leandro,

Thanks for the information.† My intention was to operate at full-speed since our demands for data rates are low and it avoids issues associated with higher speed signals, but it may be that I interpreted the USB specs of downstream devices incorrectly (I havenít engineered USB circuits before).† They are supposedly full-speed compatible but I will check further.

You do not specify which USB port of the gumstix you are using. The EHCI (USBH_*) port only supports High Speed USB 2.0 so it will not work with full/low speed hub or devices directly. If you need to use full/low speed devices they should be connected to a high-speed hub.

The OTG port (USBOTH_*) supports all speeds.

†- Juha


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View this message in context: RE: Embedded USB hub
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