On Jul 25, 2011, at 10:02 AM, Alexander Thomas wrote:

On Mon, Jul 25, 2011 at 4:43 PM, Steve Modica <modica@small-tree.com> wrote:

On Jul 25, 2011, at 7:30 AM, Alexander Thomas wrote:

> Hi,
> Is there any expansion board for the Overo COMs that has an Ethernet port and allows to directly attach a full-speed USB device? We already have a Tobi but it proves to only support high-speed devices. Unless I'm mistaken the only way to connect a full-speed device like an USB audio device is to connect it through a hub, which would complicate our design considerably if we want to keep it a single unit.

You can put a full speed device on the OTG port.  It's an AB port so there's nothing hard about that.  Get a miniAB to B cable and you're all set.

Except for the fact that the OTG port only delivers up to 100mA and the audio device requires 400mA.

The strange thing is that the OMAP3530's specifications include “High-Speed/Full-Speed/Low-Speed Multiport USB Host Subsystem”. Why does the port on the Tobi only support high-speed? Can it be switched to low/full speed mode? We couldn't care less if that would mean losing high-speed.

The Host A port has the ability to support Full Speed devices *but* you have to put the chip into OHCI mode and that requires a different back end interface (which appears to be missing).  So if you want to do this, you have to create that backend interface


Alexander
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