Re: [Gumstix-users] Gumstix usb host?

[J.P. N. <jn...@pr...>]

Sorry for the delay.  In short, you'll need to make a daughtercard
that's somewhat similar to etherstix, but instead has a USB host.  Some
documentation (such as that for the TD243) has instructions on how to
connect the device to a PXA25x.
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It might be easier to wait for the next version of the gumstix to debut,
which in all likelihood will include an on-chip USB host.

________________________________

From: gum...@li...
[mailto:gum...@li...] On Behalf Of
Demetris Zavorotnichenko
Sent: Friday, July 07, 2006 14:47
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Gumstix usb host?


Can you explain on more detail how can this be done?
I have a USB2 board with an OV9650 Camera on it and i want to connect
that to Gumstix. So this would really help.
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Demetris Z.
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	----- Original Message -----=20
	From: J.P. Norair <mailto:jn...@pr...> =20
	To: ce...@gm... ; General mailing list for gumstix users.
<mailto:gum...@li...> =20
	Sent: Friday, July 07, 2006 8:41 PM
	Subject: Re: [Gumstix-users] Gumstix usb host?

	USB 2.0 includes the optional On-The-GO specification.  This is
the only type of USB where a slave can be a master, and vice-versa.
After reading the USB spec a few weeks ago, I was forced to wonder why
Firewire didn't beat it.  I assume the reason involves marketing and
corporate politics.
	=20
	The PXA255 does not have a USB Host peripheral built in.  The
PXA270 has a host and an OTG host.  The Samsung S3C24X0's have very
thorough USB peripheral support as well.
	=20
	I am actually in the position where I want to have 3 to 4 USB
host ports.  If you already have a host peripheral, then a hub IC will
work OK, but if not, there are a handful of nice 3x and 4x host ICs on
the market.  Most of them are fairly easy to connect to the PXA255's DMA
bus, and have mature linux support.
	=20
	Cheers,
	JP
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	=20
________________________________

	From: gum...@li...
[mailto:gum...@li...] On Behalf Of Tim
Newsom
	Sent: Thursday, July 06, 2006 02:39
	To: Gumstix Mailing List
	Subject: [Gumstix-users] Gumstix usb host?
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	I know everyone says that they cant be a usb host. So I am going
to ask a stupid question and maybe someone with more experience can fill
me in on the technical reasons for the answers....
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	Based on the pinouts is it just the lack of power for vbus that
keeps a USB device from pretending to be a master?  I know that USB 2.0
allows some general use cases where a slave can be a master.  I remember
reading somewhere that the gumstix would never be a master device, but
it would seem that all you need to do is provide a GPIO controlled +5v
to the vbus and an appropriate driver and all would be well.  Am I way
off the mark there?  Has someone already fixed this problem when I
wasn't looking?  I have a need to make the gumstix control some devices
and I would like to use the USB bus to make it happen.
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	--Tim.
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