N900 will not allow USB OTG! - Page 19 - maemo.org

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Page 19 of 110

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nashith	2009-09-21 , 23:56
Posts: 226 \| Thanked: 63 times \| Joined on Sep 2009 @ Maldives	#181

Originally Posted by f(x)

Seriously this a deal breaker to me.
I know that SD-USB converter might be the solution for this one.
From what I found SD cards require 3.3v to run (2.7~3.6v is also possible) and USB requires at lest 4.75V. Which might be a problem here. Anyway to make a converter it might work with connecting a usb pins to the following
microSD-=-USB
Pin---Pin
1
2
3--->2*
4--->1
5
6--->4
7--->3*
8

Now we want someone to sacrifice his microSD + USB device (his usb stick?) + card-reader/laptop/n900/mobile to see if its going to work :P
Before going a head I have to warn you that I didn't know which pin to which it should be connected in the case of (7&3)* One suppose to be Data in and other Data-out. I think someone who is into DIY or in electric can do it in the right way. I should also include that you shouldn't try this with with any important data in your usb stick. The worse case it might not work or you just burned it out.

For electric guys check this out

USB Pinout:
http://pinouts.ru/Slots/USB_pinout.shtml
SD (microsd):
http://www.chlazza.net/sdcardinfo.html
http://www.pqi.com.tw/upload/downloa...xxx%20VA.1.pdf
(In the following link it shows to how to connect a miniSD to microSD)
http://www.planetmobile.it/jumpjack/...inout-eng.html

Interesting.. Nokia should have removed the redundant SD slot all together, 32GB is enough for most people and should have used the extra physical space for another USB OTG port. I carry a SDHC card reader (SanDisk ~ 1 inch and thin) loaded with a 16 GB card all the time anyway and its light as a feather. It would have been more of mobile computer if it had a hard port to connect to the external real world we live, not everything have bluetooth.

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vinc17	2009-09-21 , 23:56
Posts: 227 \| Thanked: 53 times \| Joined on Feb 2008 @ Lyon, France	#182

Originally Posted by allnameswereout

I think that is something which would be a viable solution but this one you link to doesn't support USB host mode.

It does support USB host mode. Otherwise how can it work with a camera? The text also says: that work as a host for other digital devices.

lma	2009-09-22 , 00:00
Posts: 2,802 \| Thanked: 4,491 times \| Joined on Nov 2007	#183

Originally Posted by Texrat

And yet the appelation "mobile computer"...

Which means very little really. While it may be portable and contain a microprocessor, it's less useful as a general purpose computer than its predecessors despite the extra processing power. USB host/OTG is just the latest item in a long list of pre-existing features that we took for granted but have been removed from the N900/Fremantle.

	fnordianslip	2009-09-22 , 00:01
	Posts: 670 \| Thanked: 359 times \| Joined on May 2007	#184

Originally Posted by NvyUs

This thread is kind of getting pointless same people just repeating there dissatisfaction over and over and not willing to budge and look at alternative solutions.
Its best to wait until people start getting the n900 in there hands and take a look and see what can be done on various levels to see if theres solution before outright thinking it'll never happen and getting mad

Well, unless the software hackery suggestions can be realised, there is no alternative to a functioning USB host mode for connecting USB devices to the N900, and therefore no way to budge.

If we are vocal enough about it now, maybe Nokia won't repeat their mistakes next time, although that won't make me feel better about the £500 for the N900.

To get over the USB charging issue coupled with the need for a powered hub, IMHO Nokia should have considered designing a battery powered USB hub as an accessory.

Don't get me wrong, I'm sure I'll enjoy my N900 when it arrives, but I will always be disappointed by this unwelcome anti-easter-egg.

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Patience : [####------] Weapon(s): My cat, my code.
Agro ... : |#---------] Relic(s) : N900, MacBookPro, NSLU2, N800, SheevaPlug, Eee-901, Core2-Quad, PS3
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	qole	2009-09-22 , 00:09
	Moderator \| Posts: 7,109 \| Thanked: 8,820 times \| Joined on Oct 2007 @ Vancouver, BC, Canada	#185

Originally Posted by BruceL

So, how can we test the "USB TESTMODE"? Is there anyone here who knows enough to write a script that would activate this TESTMODE? Any one with a N900 would would run it for us?

If someone writes the code, I'm sure someone will be able to test it. But rigging up a power injector or powered hub for just a USB key is going to be pretty lame, and carrying a hub and battery pack around is almost as bad as an extra tablet....

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	NvyUs	2009-09-22 , 00:10
	Posts: 1,885 \| Thanked: 2,008 times \| Joined on Aug 2009 @ OVI MAPS	#186

when all the newbies was complaining about no portrait support out the box lot of the older community members was there slaughtering them.
now theres a feature missing what affects a lot of them more its ok to complain about n900 now hmmm. Theres a little bit of double standards around here.

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range	2009-09-22 , 00:10
Posts: 337 \| Thanked: 160 times \| Joined on Aug 2009 @ München, DE	#187

Originally Posted by pataphysician

Easy, the large n900 would have a regular nokia charger and not braindead usb charging, so the usb port would just be just that a usb port. Or you could have two usb ports one for charging and client mode and one for host. Personally I would prefer the regular old nokia charger as they are much faster at charging than crap usb charging, which is really only fine in my book, for small battery dumb devices.

That won't work if you want the device to be a phone *and* to be sold in the EU. Device manufacturers have decided on one standard way of charging: MicroUSB.

	allnameswereout	2009-09-22 , 00:12
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#188

Originally Posted by vinc17

It does support USB host mode. Otherwise how can it work with a camera? The text also says: that work as a host for other digital devices.

Woops you're right, the reviewer has used an USB cable to put his digital camera on the device. That can only work if one of the two devices supports USB host mode.

The reviewer never replied though, and doesn't state the exact model. In the link provided in the article you get to see the specifications and it doesn't mention USB host mode or USB OTG or copying directly from digital camera to device via USB! The item is also out of stock but several alternatives from same brand exist see http://www.usbgeek.com and search for DigiMate

I found this review too on DealExtreme its of an older version but it also clearly states this device supports USB 2 host mode / OTG:

Host Mode: Back up/copy files from many different kinds of USB devices (such as digital camera, card reader, mp3 player, flash disk etc.) to the HDD by one touch WITHOUT a PC or laptop/notebook.
Device Mode (MSD Mode): It is a reliable USB 2.0 2.5" HDD enclosure
No external power required when used as a HDD case only (Device Mode)

http://www.dealextreme.com/details.dx/sku.639

So in host mode it would need external power, as expected.

Also, there is the issue of data integrety. Although that is inherent to USB. The reviewer said this:

There is only one thing making me a bit nervous. Even so that so far everything worked well, files were properly stored on Digi-Mate and available for download to PC – one can never be 100% sure and/or verify that the files were transferred OK. So you are not completely at ease when you erase your memory card to make room for more videos. It would be nice having an LCD on this gizmo and being able to verify the files and their size. As for the data transfer speed, about 25 to 28 MB/s when connected to a PC and about 4.5 MB/s when downloading from camera (same as downloading to PC).

Oh, and the thing uses FAT32.

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Architengi	2009-09-22 , 00:17
Posts: 362 \| Thanked: 109 times \| Joined on May 2009	#189

Originally Posted by range

That won't work if you want the device to be a phone *and* to be sold in the EU. Device manufacturers have decided on one standard way of charging: MicroUSB.

What if someone wants to use the USB HOST (for let's say reading an USB flash memory or a CD/DVD drive) and at the same time the device needs charging?

Nokia should have think from the beginning to put 2 USB ports on this so-called "mobile computer"...