N900 will not allow USB OTG! - Page 23 - maemo.org

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	vkv.raju	2009-09-22 , 02:45
	Posts: 402 \| Thanked: 451 times \| Joined on Dec 2007 @ India	#221

Originally Posted by JayOnThaBeat

Like I suggested, we should wait til a decent-sized handful of people have the device in their hands.

You can't exactly fix it without having it to begin with, can you?

Then what should I do with my pre-order?

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	BruceL	2009-09-22 , 02:46
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Originally Posted by JayOnThaBeat

Like I suggested, we should wait til a decent-sized handful of people have the device in their hands.

You can't exactly fix it without having it to begin with, can you?

Some people have it. If they can verify that a fix would work then I (and many others) wouldn't have to cancel our pre-orders. If I don't have to, I do not want to wait until it is released, THEN another few weeks for people to try the fix. I REALLY don't want to cancel, but I can't justify that much $ if it doesn't solve my problem.

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bocaJ	2009-09-22 , 02:56
Posts: 224 \| Thanked: 107 times \| Joined on Aug 2009	#223

I am not an engineer, but I think this document might help:

http://www.usb.org/developers/ontheg...and_EH_2-0.pdf (pdf warning)

Someone smarter than me can read this maybe.

	allnameswereout	2009-09-22 , 03:31
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#224

Originally Posted by thecursedfly

(sorry for answering like 3 pages after your post)You seem to continue with the same mistake: this one is just a USB hub with incorporated bluetooth dongle and card reader

That is the same as:

[quotte]N900 -> [bluetooth] -> (selfpowered) Bluetooth Hub with female USB port -> USB flash drive (or any other USB slave device)[/quote]

find a solution to the USB host thingie, and in a couple of months max, a N900 will be mine... ^^
otherwise, time will tell.

See http://talk.maemo.org/showpost.php?p...&postcount=195 & its parents. This device supports USB host mode.

But frankly.. I think you (and some other folks) are not doing your home work. Because if it does not matter how much power the device draws (it uses an adapter anyway) then we're quickly done, and welcome to embedded world of Linux.

For example a Soekris 5501 can have SATA or PATA (and has CF too). You'd have internal storage and use N900 to connect to it. It doesn't have PCMCIA though (but some other versions do). It has a USB port and could use host most (but not charge device over USB). It has MiniPCI and MiniPCI Express too. It could run *NIX or whatever you want...

http://www.metrix.net/pcmcia-to-usb-...4521-p-69.html

or this

http://www.linuxfordevices.com/c/a/N...eamScreen-100/

or a settopbox (I bet my Philips DVR would work. Not sure it has USB, have to check.)

or the predecessor of this

http://www.linuxfordevices.com/c/a/News/Linutop-3/

or this HDD enclosure with USB OTG (has even on-board battery?!)

http://www.acesuppliers.com/Supplier...oom_12470.html

And thats found with 5 min searching, and they're a bit overkill, so I'm sure you can do much better.

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nashith	2009-09-22 , 03:37
Posts: 226 \| Thanked: 63 times \| Joined on Sep 2009 @ Maldives	#225

Originally Posted by JayOnThaBeat

I foolishly thought I was smarter than you, and subsequently tried to read that.

ouch

The specification http://www.usb.org/developers/ontheg...and_EH_2-0.pdf has a revision as late as May 8, 09. And it also mentions hardware changes to enable charging via USB. I am no expert but there is this "Targeted Host" mode, which simply saying allows something in between OTG and EH, with certains limitations on what type of devices it supports.

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	Texrat	2009-09-22 , 03:50
	Posts: 11,700 \| Thanked: 10,045 times \| Joined on Jun 2006 @ North Texas, USA	#226

Originally Posted by nashith

The specification http://www.usb.org/developers/ontheg...and_EH_2-0.pdf has a revision as late as May 8, 09. And it also mentions hardware changes to enable charging via USB. I am no expert but there is this "Targeted Host" mode, which simply saying allows something in between OTG and EH, with certains limitations on what type of devices it supports.

Which is right where we are with current tablets, more or less.

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	ossipena	2009-09-22 , 05:24
	Posts: 3,159 \| Thanked: 2,023 times \| Joined on Feb 2008 @ Finland	#227

Originally Posted by thecursedfly

my digital camera uses SD cards, not microSD. only ways to transfer photos are: USB or SD reader.

haha seriously

if this is a problem, i suggest thinking it again as long as it takes so you realize something....

	allnameswereout	2009-09-22 , 05:25
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#228

http://www.usb.org/developers/ontheg...ices_FINAL.pdf

Page 7 illustrates 3 scenarios. But doesn't say all 3 may be available using 1 USB port.

Page 8 shows a Nokia N810

Page 11 shows a car radio. If that supports USB OTG.

Really weird. Maybe the update to the specification came too late for N900.

From the other PDF, here is definition of "Targeted Host"

As computing resources have become less expensive, the line between PCs and other products has
blurred. Today many devices that are not PCs in the classic sense have a need to connect directly to
peripherals: Printers connect directly with cameras, for example, or mobile phones may need to connect
to USB headsets.
These non-PCs have the computing resources to manage a USB host function, but they need to function
in ways that differ from standard PC hosts. Although they will provide host capability for some devices,
it's unreasonable to require them to support the full range of USB peripherals. For example, connecting
a camera to a printer makes a lot of sense, but the printer manufacturers may not think it is quite as
important for the printer to support a USB GPS dongle. Because this is new territory for USB, developers
need a way to understand what USB functionality they need to provide and what functionality is not
required.

This specification defines these non-PC hosts as Targeted Hosts. A Targeted Host is a USB host that
supports a specific, targeted set of peripherals. The developer of each Targeted Host product defines
the set of supported peripherals on a Targeted Peripheral List (TPL). A Targeted Host needs to provide
only the power, bus speeds, data flow types, etc., that the peripherals on its TPL require.

If you go to 2 Operational overview in the PDF it says

An OTG device is required to have one, and only one USB connector: a Micro-AB receptacle as defined
in [Micro-USB1.01]. This receptacle is capable of accepting either a Micro-A plug or a Micro-B plug
attached to any of the legal cables and adapters defined in [Micro-USB1.01].

[...]

An Embedded Host is required to have one or more Standard-A receptacles as defined in [USB2.0].
Optionally an Embedded Host may also contain one or more Type-B receptacles but these must be
implemented such that the user is unlikely confuse the EH with a USB hub. Since the Standard-A plug
does not contain an ID pin, an EH is not able to automatically power the USB bus on plug insertion
unless ADP is also supported.

So, seems according to the spec it is not allowed to have 1 USB OTG and 1 USB EH connector (for charging the device).

I'll read the rest some other time because I gotta go on the go.

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	qole	2009-09-22 , 05:45
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Good news, the N800 and the N900 make a nice little wifi adhoc network that can be used for sshfs and copying files... So no need to worry about BT speeds.

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Last edited by qole; 2009-09-22 at 05:50.