N900 will not allow USB OTG! - Page 94 - maemo.org

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blue_led	2010-05-20 , 20:28
Posts: 306 \| Thanked: 566 times \| Joined on Jan 2010 @ Romania	#931

afik if both data lines are low level this mean SE0 and ANY device peripheral or host ( even host ) can't use data channel.
if a peripheral is inserted into a host receptacle this is signaled by pulling d+ up so this differential "1" mean session can be started.
from peripheral POV those :R keep d- low for charger detection and d+ low for not initiate SRP because phy is MASTER on ulpi ( DIR signal is output on phy )
so all make sense

Last edited by blue_led; 2010-05-20 at 20:32.

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egoshin	2010-05-20 , 20:46
Posts: 992 \| Thanked: 995 times \| Joined on Dec 2009 @ California	#932

Originally Posted by blue_led

afik if both data lines are low level this mean SE0 and ANY device peripheral or host ( even host ) can't use data channel.

It uses 15K Ohm resistors.

EDIT: at least it looks like.

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	javispedro	2010-05-20 , 21:38
	Posts: 2,355 \| Thanked: 5,249 times \| Joined on Jan 2009 @ Barcelona	#933

Originally Posted by blue_led

joerg you are partially wrong

Well, I think he's right. You cannot detect if a peripheral has been attached to the N900; you need to be in a "special" mode which forces the PHY to be powered, adequate pull up/downs, ....

It is theoretically feasible to be _always_ on this especial state, but I wonder about battery life...

Of course since you plan to use a self powered "docking station" you could use vbus sense for the task.

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blue_led	2010-05-20 , 21:57
Posts: 306 \| Thanked: 566 times \| Joined on Jan 2010 @ Romania	#934

Originally Posted by javispedro

Of course since you plan to use a self powered "docking station" you could use vbus sense for the task.

yes, this is my goal.
i want to differentiate attachment to pc or attacment to self powered charging capable docking station

even in manually activated host mode vbus sense can trigger without manual selection charging mode

some misunderstandings because my english knowledge is limited

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	Benson	2010-05-21 , 00:53
	Posts: 4,930 \| Thanked: 2,272 times \| Joined on Oct 2007	#935

Originally Posted by eryx

Can we use WiMax usb modem with this host mode? madwifi drivers theoretically can be easy compiled for N900.

Once host mode is working properly, yes, USB data modems of all varieties should work fine. But madwifi would have nothing to do with this -- USB data modems show up as a tty which is talked to with a modified Hayes command set.

The use of madwifi (or other wifi drivers) would be with a USB wifi stick; among benefits over the N900's wifi are 802.11a/n 5GHz band, and packet injection for aircrack-in-a-pocket. This (aircrack stuff) was done by some people on the N8x0 after OTG arrived, search about for exact details...

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egoshin	2010-05-21 , 01:37
Posts: 992 \| Thanked: 995 times \| Joined on Dec 2009 @ California	#936

Ha!

I found why N900 on USB-to-PC has a constant frequency 500MHz while USB cable from PC (not fast charger) is connected -

../../../arch/arm/mach-omap2/board-rx51.c:156: omap_pm_set_min_mpu_freq(dev, set ? 500000000 : 0);

... and it is called while resuming power for USB to communicate with gadget.

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	BLIZZARD	2010-05-21 , 04:37
	Posts: 194 \| Thanked: 266 times \| Joined on May 2010	#937

maybe try using easy debian? its a hole different os and also when i go to folder media it has mmc1, mmc2, and usb folders in it (i donts know if that helps)

eryx	2010-05-21 , 07:10
Posts: 2 \| Thanked: 0 times \| Joined on Feb 2010 @ Moscow	#938

Originally Posted by Benson

Once host mode is working properly, yes, USB data modems of all varieties should work fine. But madwifi would have nothing to do with this -- USB data modems show up as a tty which is talked to with a modified Hayes command set.

The use of madwifi (or other wifi drivers) would be with a USB wifi stick; among benefits over the N900's wifi are 802.11a/n 5GHz band, and packet injection for aircrack-in-a-pocket. This (aircrack stuff) was done by some people on the N8x0 after OTG arrived, search about for exact details...

Sorry! I mean "madwimax" driver. I try this soon.

Last edited by eryx; 2010-05-21 at 07:52.

	MohammadAG	2010-05-21 , 07:53
	Posts: 2,473 \| Thanked: 12,265 times \| Joined on Oct 2009 @ Jerusalem, PS/IL	#939

Originally Posted by BLIZZARD

maybe try using easy debian? its a hole different os and also when i go to folder media it has mmc1, mmc2, and usb folders in it (i donts know if that helps)

Host mode should be OS independant.

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	joerg_rw	2010-05-23 , 17:56
	Posts: 2,222 \| Thanked: 12,651 times \| Joined on Mar 2010 @ SOL 3	#940

http://mxr.maemo.org/fremantle/sourc...b_procfs.c#661

Code:

656         case 'H':
657                 if (mbase) {
658                         reg = musb_readb(mbase, MUSB_DEVCTL);
659                         reg |= MUSB_DEVCTL_HR;
660                         musb_writeb(mbase, MUSB_DEVCTL, reg);
661                         /* MUSB_HST_MODE( ((struct musb*)data) ); */
662                         /* WARNING("Host Mode\n"); */
663                 }
664                 break;

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