Re: [Gumstix-users] USB Host on Gumstix problem

[Chinab C. <chi...@gm...>]

Hey,

I used the OTG port to connect the GPRS modem and it did not work.

I did ground pins 4 and 5 of the OTG USB on the tobi board to ensure the
gumstix acts as the master. This is because I did not have the OTG cable.

Regarding power, I think the only power is consumed by the connection of the
USB device to my device only as the GPRS device itself is external powered.
So, I dont think I am using more than 100mA either.

Bootlog is as follows:

[    4.828887] usbcore: registered new interface driver usbserial
[    4.835174] USB Serial support registered for
generic
[    4.840606] usbcore: registered new interface driver
usbserial_generic
[    4.847473] usbserial: USB Serial Driver
core


reading
boot.scr
[    4.972534] USB Serial support registered f)

Is there anything which I missed?

Thanks.

Chinab


On Fri, Oct 28, 2011 at 4:27 PM, Steve Modica <mo...@sm...> wrote:

> The pins for using Full Speed mode are not all connected.  Further, the
> driver does not have the code to drive the chip in that mode either (it's
> different pins)
>
> Steve
>
> On Oct 28, 2011, at 7:35 AM, Alexander Thomas wrote:
>
> > Hi Chinab,
> >
> > There is no way at all to get the USB host port to work in anything
> > but high-speed mode. Stop trying to do it, you'll only waste your time
> > (been there, done that). Although the OMAP35xx does support USB 1.1 on
> > the host port, it requires a separate USB 1.1 PHY chip which is not
> > present on the Gumstix boards.
> >
> > The good news is that the OTG port in host mode does support low- and
> > full-speed. But if your device draws more than 100mA, you will still
> > need the powered hub.
> >
> > Alexander
> >
> >
> > On Fri, Oct 28, 2011 at 2:17 PM, Chinab Chugh <chi...@gm...>
> wrote:
> >> Hey All,
> >> I have a overo earth+tobi interface running 2.6.39 kernel. I want to use
> a
> >> 2.0 USB 12MBPS GPS modem device with my gumstix as a host.
> >> I tried to connect it to the USB host, but it never worked directly
> unless
> >> it was connected via a USB hub (non-external powered).
> >> To understand why this is the case, I read on the Gumstix website
> >> that: Gumstix "Host" = USB High speed (480Mbit/s ONLY). You will need a
> hub
> >> to connect to most USB -> Serial adapters
> >> [http://gumstix.org/getting-started.html]
> >> But why is it '480Mbps ONLY'? The OMAP35x Technical Manual mentions that
> the
> >> USB host subsystem complies with USB 2.0 12 or 1.5 or 480 Mbps signals.
> Also
> >> it states that it complies with both EHCI and OHCI.
> >> So how do I get my Gumstix to be configured to making such a USB
> connection
> >> to work... I did try to add the OHCI module in the kernel but it did not
> >> help. Is there any pin on the omap or a register value which I can use
> to
> >> ensure that OHCI is used instead?
> >> It is interesting that many people provide the solution as using a USB
> hub.
> >> I know that is a solution, but I am a bit confused as to why I have to
> use
> >> it in the first place...
> >> Furthermore, I don't mind using the OTG port - will it work there
> without a
> >> hub?
> >> Thanks a lot for helping! I am a bit lost so will appreciate any
> >> suggestions.
> >> Chinab
> >
> >
> > --
> > Alexander Thomas
> > Research Engineer
> >
> > eSATURNUS NV
> > T +32 16 40 12 82
> > M +32 477 51 63 62
> > http://www.esaturnus.com
> >
> >
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>
> --
> Steve Modica
> CTO -  Small Tree Communications
> www.small-tree.com
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------------
> The demand for IT networking professionals continues to grow, and the
> demand for specialized networking skills is growing even more rapidly.
> Take a complimentary Learning@Cisco Self-Assessment and learn
> about Cisco certifications, training, and career opportunities.
> http://p.sf.net/sfu/cisco-dev2dev
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-- 
Take care and enjoy the day!

Chinab :) :D :P