USB OTG host mode (ANY USB keyboard support!) TUT

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USE ANY USB KEYBOARD WITH YOUR USB OTG SUPPORTED ANDROID DEVICE!!!!

I've been experimenting with Wifi cards and the samsung galaxy sII
and realized people where having the same problem as i was having with plugging in usb keyboards.

turns out it all has to do with a vendors permission issue. if your device is not in the list, it will seen as "unknown".

As it turns out you can simply add your device and it'll work. mind you it was to be a simple input device and will have the power constraints of 100mW. But if u can compile a driver and splice in dc power.... skies the limit!

steps:

1. Android must be rooted (not going over that) and must support USB OTG (on-the-go)


2. You can either buy a USB OTG micro to female adapter on ebay for like 4 bucks. i decided to make one myself since i have lots of spare parts.
Heads up: a simple micro usb to female usb connector IS NOT THE SAME AS A USB OTG CABLE, they may look the same but the OTG cable has Pin 4 grounded to pin 5 on the micro usb side. This is how the device distinguishes aach type of cable. WARNING: IF MAKING THIS YOURSELF DO NOT CROSS BLACK AND RED, this WILL fry your PHONE.if you don't know you rway around a soldering iron, just buy one


3. Check what manufacturer your device is on this chart, if it's not there, check on the internet or plug the usb device into a linux box and run "lsusb" in the command promt and look for your device, the number will look like this:

Bus ### Device ###:ID <THIS ONE!>:<more numbers> " Company"

here's the chart: (taken from here :http://developer.android.com/guide/d...ng/device.html)

Company	USB Vendor ID
Acer			0502
ASUS			0b05
Dell			413c
Foxconn		0489
Garmin-Asus	091E
Google		18d1
HTC			0bb4
Huawei		12d1
K-Touch		24e3
KT Tech		2116
Kyocera		0482
Lenevo		17EF
LG			1004
Motorola		22b8
NEC			0409
Nook			2080
Nvidia			0955
OTGV			2257
Pantech		10A9
Philips		0471
PMC-Sierra		04da
Qualcomm		05c6
SK Telesys		1f53
Samsung		04e8
Sharp			04dd
Sony Ericsson	0fce
Toshiba		0930
ZTE			19D2

eg my keyboard is lenovo , so code is 17EF, you get it

4. log in as root, mount system as read-writeable, Create this file: /etc/udev/rules.d/51-android.rules
if its already there, then just append the command you want after.

if you dont have root explorer or otherwise installed here is how to in bash:

su
su
mount -o remount,rw system /system
mkdir -p /etc/udev/rules.d/
cd /etc/udev/rules.d/

now in the "51-android.rules" file add this line (or more for more device support):

SUBSYSTEM=="usb_device", SYSFS{idVendor}=="<VENDOR CODE>", MODE "0666", NAME=="<VENDOR>"


my example with my lenovo keyboard:
SUBSYSTEM=="usb_device", SYSFS{idVendor}=="17EF", MODE "0666", NAME=="lenovo"

save.

5. plug in the USB OTG cable and plug in your keyboard or other device. it sould say "usb host cable" then "usb device".

on some keyboards the numlock light wont work, due to the fact of power contraints on the phone, you can add support by plicing in 5v DC in to the line (soldering needed) or you can probably jsut attach a powered usb hub



And thats IT, now you can actually type documents at a reasonable pace, without paying an arm and a leg for a supported bluetooth keyboard!!!

-td8f4

* to moderators i know i have less than 50 posts hopefully i dont get banned, i thought this was considered dev*

Wow, really nice work - I wonder if some kindly ROM devs could just bake in support for all in their ROMs?

Originally Posted by NZtechfreak

Wow, really nice work - I wonder if some kindly ROM devs could just bake in support for all in their ROMs?

wow really good work.

just another info on the price of an BT keyboard:

http://www.amazon.de/s?ie=UTF8&searc...rds=CHIN%20FAI

40 euro are not an arm and a leg :)
and this i ok to type on

Indeed, you can get some BT keyboards quite cheaply. I already have one, but I'd still like full USB keyboard support (I don't always have my keyboard on me, but lots of people have USB keyboards).

I tested this on an unrooted SGS (Logitech K340 unifying keyboard) and it worked fine without having to change any settings. Just plugged it into the USB OTG adapter and then plugged the adapter into the phone. It said the device was unknown but the keyboard worked when I went to type in the apps. Mice also worked. The logitech MX Performance worked fine. A bit weird seeing a mouse pointer on the phone though.

How about keyboard remapping?

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At first I thought:

"1) plug in OTG cable, 2) plug in USB keyb., 3) use"

*lol*

No, seriously, this information is VERY usefull and might open up the way not only for keyboard (as the OP stated, "get a driver compiled and the sky is the limit".

Will definitaly bookmark this thread and when I'm done with some other tinkerings try to "get the drivers compiled"

*clicksthanks*

reply

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my ultimate goal is to have a external usb wifi adapter plugged into my phone so i can use it to pentest with a Backtrack 5 chroot session.

i'm working on cross compiling the RTL8187 driver for the ARM architecture.
look here for updates

http://forum.xda-developers.com/showthread.php?p=16333147

and @ karl999999

40 euro are not an arm and a leg :)
and this i ok to type on

i know it's not expensive, but i'd really rather use something i already have, i've got a small flexible usb keyboard which works great.

As I'm trying to add joystick support on SGSII, I tried to add an xbox 360 controller and my device was not recognized. I tried this method and added "045E" as vendor but no luck, still not recognized... Any idea ?

Thanks

Originally Posted by alx5962

As I'm trying to add joystick support on SGSII, I tried to add an xbox 360 controller and my device was not recognized. I tried this method and added "045E" as vendor but no luck, still not recognized... Any idea ?

Thanks

Also interested in this... Sadly I dont have the skills to compile a driver myself...

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