[maemo-developers] [maemo-developers] Can a USB modem be attached to N800?

From: Aaron Westerdale pvillese at gmail.com
Date: Mon Feb 12 13:52:23 EET 2007
On 2/12/07, Kate Alhola <kate.alhola at nokia.com> wrote:
>  ext Andrew J. Barr wrote:
> On Sun, 2007-02-11 at 14:18 +0530, mayank jain wrote:
>  On 2/11/07, Andrew J. Barr <andrew.james.barr at gmail.com> <andrew.james.barr at gmail.com> wrote:
>  On Sun, 2007-02-11 at 00:27 +0530, mayank jain wrote:
>  Hi guys,
> I recently found that an ISP - Reliance Telecom here provides a USB
> modem, which uses CDMA technology for establishing a dial-up
> connection. This modem works perfectly with a Linux based machine.
> Device details at
> http://www.reliancecommunications.co.in/Communications/Netconnect/netconnect_hotnew.html
> Look for "Reliance Netconnect USB Modem".
> Is it possible that this modem can be attached to N800 & used for
> internet? Because if this is so, internet would be available to my
> device from almost anywhere - Wifi or no Wifi.
>  You would want to find some kind of Bluetooth device for this. This
> works fine with the Nokia tablets.
> The 770 had limited support for USB host mode but AFAIK the N800 doesn't
> seem to have this feature. No one has tried it yet, at least ;)
>  Oh,
> I just saw the thread mentioning 'injecting power into USB" - & this
> modem needs 5V/500ma, from USB - So i dont think this would be
> possible...
>  It would be horribly unwieldy, you'd need a power injector device as
> well as a USB hub (or at least some kind of adapter). It would defeat
> the "portable" aspect of the Nokia tablets.
>  It just needs a some kind of hack that injects little bit +5v to 770/N800
> connector so that it detects USB device present there. It does not need
> actual
> power suplied by this way.
> I have personally used two kind of hacks for this. Simpler is just to use
> USB HUB that has +5V input from power supply. These units has one
> schotky diode preventing them in normal operation feeding power back
> to host. With 770/N800 usage, just replace this diode with wire that
> feeds +5V back because it is behavior that we need.
> I have done same hack for some self-powered USB devices, so then no hub
> needed al all. Anyhow, all of these hacks needs to have external +5V power
> supply
> becausse 770/N800 is not suplying power to them.
> The other problem is that 770/N800 is having only minimun USB driver set
> in kernel and if your device is not matching small number of
> manufacturer/device ID, you need to have also kernel driver.
>  This is why Bluetooth is ideal for this kind of situation; you'd have
> your cell phone in your pocket, your tablet in hand...pervasive Internet
> access almost anywhere. This is what I do, at least.
>  I also recommend bluetooth until you have very good reason to use
> other methods. I personally used USB to connect embedded realtime
> data accusation/real time control device.
> Kate
> What you describe I believe was at least possible on the 770, however.
>    Right Andrew?
> :)
> Makuchaku
> http://www.makuchaku.info/blog
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You said you use it with USB interface to realtime embedded system.  Could
you possibly pointing me in a direction to look into to interface with
embedded systems.  I built a model truck controlled by an 8051 controller
that I use a program like hyper terminal to program through USB to Serial.
It would be cool at demonstrations to be able to program the truck with my
N800 instead of having to hook up to my laptop.  It could simply send
precompiled HEX files to the controller, even cooler if I could figure out
how to compile the files but uploading precompiled would be good enough.
Any help is greatly appreciated.

Aaron Westerdale
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