Re: N900 will not allow USB OTG!
 

The USB OTG is non-existent on the N900 - there's something in the USB specs which prohibits USB OTG with charging, or without supplying power, or something like that. Anyway, the USB chipset in the N900 is (apparently) not wired up to allow enabling host mode at all.

Re: N900 will not allow USB OTG!
 

Just read this article from the maemo mailing list. I have added it here in case it was missed:-

http://www.gossamer-threads.com/list...velopers/55703

Re: N900 will not allow USB OTG!
 

Are we dealing here with a portable-computing question of how to bring the N900's powers of processing and display to bear on data that it must communicate by USB connection with a relatively dumb gadget like a hard drive or a printer?

Or do we have a pride-of-ownership question in which new owners seek affirmation that their expensive purchase doesn't need any help from the last-year-but-one model, thank you? (Much less the 2005 model.)

Re: N900 will not allow USB OTG!
 

clearly what i have read on here n900 cannot do USB OTG(hardware limitation?) so why is this thread still going on and on?

Re: N900 will not allow USB OTG!
 

people likes talking, and this is talk.maemo.org so its fine :)

seriously, officially its a no-go, and here we are searching for a workaround. the best efforts (of kernel debug) appears to be in a dead end, sadly


then, usb over ip efforts are in their own thread now

Re: N900 will not allow USB OTG!
 

Well, alot of people don't give a damn about USB OTG, but would very much like USB host mode.

Re: N900 will not allow USB OTG!
 

N900 uses an integrated Mentor Graphics OTG controller * (musb
mhdrc ) but hardware is acording wiki nxp isp 1707 **.
When a hacked cable ( a mode) is plugged into usb port on vbus it can detect a voltage pulse coming from n900. This is part of usb otg signaling protocol. Also on /sys/devices/platform/musb_hdrc/mode we can read a_idle
until now we have :
1) ID pin state is transmited to kernel
2) voltage can be applied on vbus
so in my opinion the limitation is only at software level
why nokia coose NXP ( former Philips ) and Mentor Graphics usb kernel Nucleus instead of full TI asics line wich can be suported in desktop like linux I can't understand, meanwhile apple continue to sell crap ifone.
Why Nokia screw usb host mode also i can't understand. Battery charging when usb host mode is selected is possible and with aid an external device host mode can be achieved ( I will ad a link later )
I start digging on datasheets but without nokia support community can't do more.
BTW in otg mode host and peripheral mode can be swaped . Can n900 perform this shift ?

* http://www.mentor.com/products/embed...s/nucleus_usb/
** http://wiki.maemo.org/N900_Hardware_isp1707

Re: N900 will not allow USB OTG!
 

Damn you for screwing this up, Nokia. Even the f'n Droid can do this while my "mobile computer" can't.

Re: N900 will not allow USB OTG!
 

moto
" Maybe devil is not so black "
aprox google translation from romanian

The Idea
n900 at least can / must perform usb otg. I initiated otg SRP by software as peripherial. With help of an aditional hardware maybe is possible to switch host mode using HNP.
last days I digging on datasheets and try to imagine how to isolate DP / DN signaling from usb stick, hub during HNP & SRP without compromise data lines.
I will dig my old colection of IC and will try to make a functional device
keep fingers crossed

Later edit
SRP session request protocol
HNP host negotiation protonol

Re: N900 will not allow USB OTG!
 

Thanks, but what do all those abbreviations mean?