I'm looking for an Android phone that supports USB host mode. The Optimus One looks like a great phone but I can't seem to find anywhere whether USB host mode can be enabled for this phone. I'll have a separate power source for the USB devices, so the phone doesn't need to supply power in USB host mode, similar to Nexus One.
Has anyone tried to make USB host mode work with this phone? Thanks,
i read the p500 datasheet ..apparently the underlying chipset msm7227 supports it ..Its just been unutilised..So no i dont think we can have USB OTG here
sarfaraz1989 said:
i read the p500 datasheet ..apparently the underlying chipset msm7227 supports it ..Its just been unutilised..So no i dont think we can have USB OTG here
Click to expand...
Click to collapse
Thanks! By being unutilised do you mean it's hardware related or it's "just" a software issue? I'll probably give it a try if can be enabled with a proper driver.
USB host mode
I built a usb adapter just like here (but not the mini dongle, yet) but I see no output in dmesg.
I have tried it with my camera which should not be USB powered (olympus dslr - that would be the primary use, if we could get it working) and with a wireless mouse (it's dongle is surely USB powered). No output in dmesg whatsoever.
I will also try a keyboard, and also test it with a USB hub with separate power input. I will also try to make that mini dongle mentioned in the link, but have to find a cheap micro usb charger first.
Another thing is that I have no idea what drivers are included in the kernel, if any, for USB devices. still trying to figure out a way to do that. If anyone knows how, please tell me how.
my kernel version is 2.6.32.9 lg-electronics (at) android3g-buildserver #1 Sat Oct 9 20:54:44 KST 2010
Build number FRF91
Software version LG-P500-V10b
EDIT:
Found this site, with the same thing done to a ZTE Blade, which is similar (same chipset - MSM7227 and same problem with powering usb devices), but has eclair (different kernel version and of course different build).
Could any of the senior or more experienced members of XDA do something similar? It would be a very nice thing to have on our little phones...
Thanks, so it looks like it doesn't "just work".
I can't be of much help just yet since I don't have the phone, but I think if you see nothing in dmesg, then first you have to rebuild the kernel with USB host support, using maybe the driver in ehci-msm7201_Blade.tbz in your second link.
It could "just" work, haven't bought a proper usb otg cable yet, mine is hacked and might not be the right one,because the micro part of it is from a normal micro usb cable, and i think that the fifth pin on the micro usb must be wired through some kind of resistor to gnd or vcc of a certain value in order to activate the host mode in proper otg manner.
Also, i do not know if the port would provide (enough) power for unpowered devices (usb memory sticks).
Anyway, i am only interested in self powered devices, such as cameras (in mass storage mode).
Sent from my LG-P500 using XDA App
Some updates here! I took the plunge and got the Optimus One anyway
The good news is that the LG v10r kernel source seems to have the USB host driver for msm7x27; it is just not compiled into the official kernels. I compiled a kernel with usbcore, ehci-hcd, usb-storage and usbhid built in.
Extract boot.img and flash it with:
flash_image boot /sdcard/boot.img
If it works, then you should be able to attach a self-powered usb mass storage device or keyboard with it. I haven't actually connected the phone with any USB device yet; the phone still charges when connected to my computer, which might not be a good sign. I'll do more testing on it myself in a few days when I get the right cables. Be warned though that I take no responsibility for any potential damage
Oh, and note that usb client mode is nonexistent with the attached kernel because host and client drivers don't play nice with each other. Because of this you'll probably see some error message that some setting application crashed, but it's not a big deal.
EDIT: this one doesn't work; please see my next post
Could some one please explain, what is this "host mode" ?
I am new to android
@haoto
Done it, no luck (no output in dmesg whatsoever)... maybe some insmod should be in order?
My cable is a hacked one, with the sense pin "floating"
I used a external usb hub, and a Y cable (with a second usb for PC-style plug) to provide the power to the hub.
Could you please post a version of the kernel that is flashable via recovery (maybe more people - including me - would find it easier to do)?
I tried to connect the camera both directly and with the usb hub in between. Not even the usb hub was detected.
Maybe the sense pin in the micro plug, that in my hacked adapter is floating...
And also, do these drivers look at the sense pin on the usb cable? I haven't found a "proper" USB OTG adapter (using a pathed one, made fom am micro data cable and a usb extender), and in the cable that I have, pin 4 (the sense pin) is floating, it's not grounded.
I think that the conflict between host and client is solved in the ZTE Blade (with an official froyo update), and, if I remember correctly, the sources for the kernel are released (I think I have seen them here on XDA). And I think that it is solved by the means of the sense pin in the usb connector. Even in the Optimus the sense pin is connected, as far as I remember from the schematics in the service manual (also found here on XDA), and it could be watched/read... but then it would not work with hacked cables.
As for the charging, I'm not sure how the charging circuit works, but, if what I'm saying about the sense pin in the USB port (I'm obsessed with that pin, it seems...) being floating (not strapped to GND) in the charger cable, it might trigger the charging circuit to start charging.
And now to explain my "obssesion" with the sense pin:
I bought a Nokia CA-157 cable (USB OTG adapter) and, not being very careful, I did not notice that it is micro USB A, not B and it does not fit (same size, but it has squared ends, so it is a bit too big...). So I tried to "bend" it i order to fit, but I destroyed it. But then I read a bit more about the pins in the usb port, and measured it (very carefully, cause the pins are so small) and found that pins 4 an 5 are strapped together (zero ohms). Then I tried to measure the pins on the normal micro usb cable, and found out that they are not strapped. So I figured that, in order to have a OTG adapter working correctly (charging, usb host and usb gadget) you need to have that 4 pin strapped to pin 5 in order to get the chipset in host mode.
@DJoptimus-One:
USB host (or rather USB OTG) is the posibility to connect devices to your android just like connecting them to a PC, eg. connecting a photo camera to the phone directly (no PC) for copying photos, or connecting a PC keyboard directly to the phone, or connecting... a USB memory stick directly to your phone for file copy... etc.
@moderators:
Maybe this thread should be moved to the development section, as it has a bit of recompiling and testing, and maybe it could get more people involved in the development of this?
More updates. I'm using the LG kernel source LGP500(Thunder)_Android_Froyo_v10r.zip which is based on linux 2.6.32.9, with stock 2.2.2 system. Attached are the boot image, kernel zImage, and kernel config I used. You should be able to at least see some dmesg output this time. Sorry if it's not easy for you to flash it; I'm completely new to android phones and will learn the proper ways when I get the time. For now it looks like everyone wishing to take this further needs to hack and compile the kernel source anyway Also, I didn't compile the USB device code (Android gadget) in because it seems to crash my phone when combined with USB host driver. Maybe the LG driver engineers didn't expect us to use it this way yet.
A Micro-AB plug (our a hacked Micro-B one like yours by soldering ID and GND) is required to produce any response when a USB device is connected. According to OTG spec you should also connect a 36.5 kΩ resistor between ID and GND when using a charger. I didn't test this, but I don't think it's a problem for now.
However, there are some complications I cannot figure out.
First, the hardware doesn't produce an ID-changed IRQ (OTGSC_IDIS) when the Micro-AB plug is plugged-in, nor does OTGSC_ID ever becomes "A". I simply hacked the is_host() macro in drivers/usb/otg/msm72k_otg.c to always return true so that the driver believes it is a host. But for some unknown reason, you still need to use a Micro-AB plug.
I did manage to get the phone run in USB host mode, using a Y-cable to power the devices. But I can't get it to recognize any device. Below is a sample dmesg output when a USB keyboard is connected:
Code:
<7>[ 153.284488] usb usb1: usb resume
<7>[ 153.284513] msm_hsusb_host msm_hsusb_host.0: resume root hub
<7>[ 153.321383] hub 1-0:1.0: hub_resume
<7>[ 153.321453] msm_hsusb_host msm_hsusb_host.0: GetStatus port 1 status 84001403 POWER sig=k CSC CONNECT
<7>[ 153.321486] hub 1-0:1.0: port 1: status 0301 change 0001
<7>[ 153.431414] hub 1-0:1.0: state 7 ports 1 chg 0002 evt 0000
<7>[ 153.431471] hub 1-0:1.0: port 1, status 0301, change 0000, 1.5 Mb/s
<6>[ 153.551378] usb 1-1: new low speed USB device using msm_hsusb_host and address 2
<7>[ 153.553388] msm_hsusb_host msm_hsusb_host.0: detected XactErr len 0/8 retry 1
<7>[ 153.554364] msm_hsusb_host msm_hsusb_host.0: detected XactErr len 0/8 retry 2
...
<7>[ 155.943383] msm_hsusb_host msm_hsusb_host.0: detected XactErr len 0/8 retry 31
<7>[ 155.944376] msm_hsusb_host msm_hsusb_host.0: devpath 1 ep0out 3strikes
<7>[ 155.944399] usb usb1: clear tt buffer port 1, a0 ep0 t00080248
<3>[ 156.151369] usb 1-1: device not accepting address 5, error -71
<3>[ 156.151451] hub 1-0:1.0: unable to enumerate USB device on port 1
<7>[ 156.151478] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 000
Notably, connecting a high-speed device such as a USB stick produces a different, and shorter message:
Code:
<7>[ 4333.870061] usb usb1: usb resume
<7>[ 4333.870088] msm_hsusb_host msm_hsusb_host.0: resume root hub
<7>[ 4333.901361] hub 1-0:1.0: hub_resume
<7>[ 4333.901438] msm_hsusb_host msm_hsusb_host.0: GetStatus port 1 status 8c001002 POWER sig=se0 CSC
<7>[ 4334.011429] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000
So, it seems that the hardware has difficulty recognizing USB "j states". I'm not really sure about this because I didn't do these experiments very carefully, and I do remember seeing "sig=j" once, but can never reproduce it anymore. (Hint: I guess it might be related to control of the pull-up resistor on the phone side. It's also possible that my cable is bad and it'll just work for you, fat chance )
As a side note, I also tried reversing the D+ and D- pins on one of the devices I tested as per:http://android.modaco.com/content-page/334222/an-experimental-cm7-kernel/page/200/#entry1667619 But (apparently) it doesn't help except making the device useless.
Hope someone can pick this up from here as I'm out of spare time at least for some weeks
Tried the latest kernel, but still does not work...
I will try to hack the cable a bit more, see if I can get any change in behavior.
I hope someone else reads this thread and and comes with some more input...
My only input so far is testing... (I do lack some knowledge about kernel building...)
Maybe looking into the ZTE Blade kernel and apps would help... (it's here)
Oops, I just noticed the build I uploaded doesn't work for me either; I changed some configuration and assumed it was harmless. They are updated now, sorry for the blunder
Will try it again (I assume it is in the older post).
Also, maybe a "software switch" (either app or simply a touch or something) could be made to switch from host to gadget mode like here? (Better after we get it working, though...)
Oh no, it's in the newer post
If you have the time, could you also try to measure the following with that kernel installed:
1) voltage between VCC and GND when nothing is connected
2) voltage between D- and GND and the voltage between D+ and GND when only a charger is connected
3) resistance between D- and GND, and resistance between D+ and GND when nothing is connected
I'm not sure I know what to do next, but this might help us clear up a couple things.
I'll try to have a look at the ZTE Blade kernel source later, thanks.
Update: it's suddenly working!!!
I successfully mounted a USB stick! So either the driver is unstable, or there indeed is something wrong with my hacked cable!
(And then I burned my USB charger! Thankfully my phone is alright. Looks like there is definitely something wrong with my cabling )
With my cable did not work, so I managed to completely destroy the micro part of my cable trying to find a way to short pins 4 and 5.
As I understand it, you have your cable with pins 4 and 5 shorted (sense - gnd).
I am still trying to find a proper adapter, but all I can find is the CA157 from nokia, which is A and does not fit...
And I could not find another standard otg cable (at least the part number, in order to find it faster) from a big manufacturer (htc, noika, samsung, whatever...).
I will get another micro and hack it once more, though, and try to measure the voltage on the pins. Maybe a noname cable is easier to mod...
As for the burnt charger... I don't think that there should be any problem... Here are some prints from the service manual.
Did you use the charger for powering the USB bus? Or did you just plug in the power?
I don't have issues with the charger connected just for charging the phone (I'm using a nokia micro USB charger, and it's working perfectly... even with the modded kernel)
I actually got a micro-B to mini-B adapter with all 5 lines connected, so I can cut the cable at any place to solder the ID and GND lines. Please do let me know when you get it working (or not... mine seems to work from time to time now)
The charger burned when I was using it to power the USB devices. I guess it's most likely caused by a short in my hacked OTG cable , it was a cheap USB charger which probably doesn't have any over-current protection.
sorry for this noobie question but did u meant we could attach usb devices directly to phone?
scorpionking674 said:
sorry for this noobie question but did u meant we could attach usb devices directly to phone?
Click to expand...
Click to collapse
Ya.
Sent from LG P500.
This seems very interesting! Can you guys write a short tutorial on the steps needed to get OTG working?
It is not fully working yet (at least not in a very friendly way).
Anyway, I'm still trying to hack a cable with the sense pin grounded, in order to do some testing at least...
Steps to be taken:
WARNING!
Rooting the phone and installing a new kernel and some other stuff presented here voids warranty, and MAY brick your phone!
Also, this requires connecting to your phone a cable that is HACKED and not supported by the manufacturer; it MAY (and is not very unlikely) FRY YOUR PHONE
We do not take ANY responsibility if you brick/fry your phone; this is only what we are doing or trying to do.
Also, the mod is not yet complete, as in the last version only the usb HOST is included (connect devices to Optimus), not the USB device is included (connecting the optimus to the PC does not work any more, not as sync nor mass storage, and there is no mode switching yet). Charging does work.
Also, after boot you get a message that some settings app does not work (we ignore that).
So, if you are willing to risk bricking or frying your phone at your own responsibilty, here is what we are trying to do...
0. Do a full backup. This is the firs step, no matter what you do to the phone (well, at least after rooting and installing custom recovery...), in order to have a WORKING restore point. (it will help if something that you have been warned might happen actually happens - except a fried phone)
1. a. Get a micro USB B male to USB A female OTG cable (that has pins 4 ans 5 straped together)
1. b. Alternatively, you can hack a cable like that, if you find the parts (one micro usb b male to mini usb male/female cable with all 5 wires inside and a normal usb a male to usb a female, and hack the cable)
2. root your phone (!! at your own risk !! only YOU are responsible for what you do to your phone)
3. install the latest kernel version posted here. Same warning as above.
4. make some hack on the cable (eg. get a y usb cable from an external hdd or something) in order to get +5V to the USB bus (at this time the phone does not supply +5V to the devices connected, maybe some state on the usb driver chip must be changed, or maybe the phone does not support providing power via the USB port). Connecting this cable to your phone may fry your phone, so double check, triple check and remember that YOU DO THIS AT YOUR OWN RISK...
5. connect a usb stick and... (from this point I could not test, as I do not have yet a cable with the sense pin grounded) make it work... (probably like in the steps below; NOTHING IS AUTOMATED YET, I GUESS)
6. open a terminal, type "su" (get root access), type "dmesg" (lots of lines will appear) and then identify the block device that the stick is (probably something like "sda").
7. make a folder somewhere where will mount the USB stick
8. mount the usb stick and see if it works properly.
From step 5 onward I did not test anything, so please correct me if I said something wrong.
Okay, So I have a project that I have been working on, and it currently runs off of a laptop that I carry around with me because it needs a camera and a projector to run. I am wondering if I get (or make) a splitter for the micro-usb port, and use a full usb female to micro-usb male adapter, can i get the camera to input into the touchpad?
If the above answer is no, then that's not a big deal as the touchpad has a camera. however, Can the micro-usb port be used as an mhl port? or is there any other adapter that can be used to output the display.
Yes, you can use the USB port for OTG (hooking up external devices). You need a micro-to-female adapter, a USB-Y cable as well as a source of power for the device in question. There are a few posts in here and in the General talking about the various OTG capabilities, so you can do that.
Touchpad USB OTG Compatability List
HOW TO: $15 stand alone powered USB dongle for touchpad
There's two threads that should help you out.
I wouldn't suggest you try using the camera on CM9 or CM10 - it just doesn't work. WebOS does, but I have no idea how OTG works within it (if at all).
Thanks! I'll take a look a little later today.
Sent from my SGH-T989 using Xparent ICS Tapatalk 2
FYI - The Y cable is just a 5V supply splice to the +5 and Ground lines of the USB port. If you don't want to wait on a Y-cable you can just cut a USB extension and splice a stable 5V power supply (or the power lines of another USB cord) and it will work great.
Sent from my SAMSUNG-SGH-I717
Hello,
I have a USB OTG cable and dell keyboard that I have tested and work in OTG mode on a Nexus 7, however i cannot get them to function with my HP Touchpad 32gb, running CM9 2.6.35, built on Sun Oct 28.
The device recognizes when I plug in anything via USB, but only as a generic Linux USB hub, and not as any particular device. Are there any steps to take to debug this? Has anyone had experience with this type of an issue?
Thanks for your help,
Cory
I don't know if this is the issue, but I know the touchpad doesn't support OTG like the the Nexus does. I think you need a Y-adapter + OTG to provide power since the micro usb port doesn't give any power to the device you connect. Someone correct me if I'm wrong though.
Apparently even a powered USB requires a powered Y cable to be properly recognized. I hacked together a quick Y cable manually, by splicing in another USB cable's power and ground (Red and black) to the respective locations on a female USB cable. Works as expected.
I am now communicating with an Arduino over Serial
Thanks!
Read this thread, should give you all the info you need:
http://forum.xda-developers.com/showthread.php?t=1582771
Basically the Touchpad has OTG but it provides no power.
wcdolphin said:
Apparently even a powered USB requires a powered Y cable to be properly recognized. I hacked together a quick Y cable manually, by splicing in another USB cable's power and ground (Red and black) to the respective locations on a female USB cable. Works as expected.
I am now communicating with an Arduino over Serial
Thanks!
Click to expand...
Click to collapse
I'm curious if you are able to charge with this cable hack while using usb devices?
Sent from my SAMSUNG-SGH-I317 using xda app-developers app
ZedZardoz said:
I'm curious if you are able to charge with this cable hack while using usb devices?
Sent from my SAMSUNG-SGH-I317 using xda app-developers app
Click to expand...
Click to collapse
if so , he is the first of the many many many who has used this cable..HPTP just is not set up for charge + usb data at the same time
amkaos said:
if so , he is the first of the many many many who has used this cable..HPTP just is not set up for charge + usb data at the same time
Click to expand...
Click to collapse
Agreed. I think people just are not stating reality regarding the ability to charge and use OTG Hosting to USB devices at the same time.
My goal here has been to attach a flash drive with video/audio media and play & charge on long flights. It looks like play, charge are mutually exclusive on my beloved TouchPad.
I've asked for the specific confirmation of this from this YouTube but have never had the poster reply:
https://www.youtube.com/watch?v=p10LgZFIawo&feature=BFa&list=PLCED27D4A23068E04&index=7
There are devices out there that have very advanced micro USB device implementations. Sadly the HP is only superficially supportive.
I for one cannot wait to get my SGN2 smart dock which offers:
Charging
OTG (x3 USB)
Audio out
HML HDMI out
Docked Profile
Not sure if this has already been discussed/discovered, but will it be possible to use the new Nexus dock "and" an OTG cable at the same time? It seems feasible given that the dock charges the device using the pin connectors which frees up the USB port.
One possible problem is that the dock also acts as a passthrough for data/audio so there may be a problem with the tablet trying to reconcile both sources trying to have simultaneous access.
I ask because it would be nice to be able to charge my Nexus 7 and utilize an OTG cable (for storage drives and game controllers) at the same time. I know there is an OTG Y-cable solution, but that involves rooting the tablet.
Has anyone already explored the possibilities of this combination?
Xenoterran said:
Not sure if this has already been discussed/discovered, but will it be possible to use the new Nexus dock "and" an OTG cable at the same time? It seems feasible given that the dock charges the device using the pin connectors which frees up the USB port.
One possible problem is that the dock also acts as a passthrough for data/audio so there may be a problem with the tablet trying to reconcile both sources trying to have simultaneous access.
I ask because it would be nice to be able to charge my Nexus 7 and utilize an OTG cable (for storage drives and game controllers) at the same time. I know there is an OTG Y-cable solution, but that involves rooting the tablet.
Has anyone already explored the possibilities of this combination?
Click to expand...
Click to collapse
I read somewhere else that while docked, the device doesn't react to an OTG cable. This is just what I've heard, haven't seen it confirmed.
This guy did something similar, and the results are evident: Dock point is useless! Charge and OTG can not be carried out simultaneously!
Would be nice to know, if Timurs kernel, which allows charging and multiple USB would solve this. Have no dock, so I can not check. What I would like to have is something like the magnetic pogo charger which is annonced for Nexus 10.
Since it almost impossible to find a PDMI Port, I retrofited a MicroUSB port.
I even contracted FOXXCON, got a reply contract DELL for replacement part.
I have Charging and Data + / - (Detected by PC) working fine.
Only Issue is that the device shows it's not charging when Power ON and connected to PC (Hardware Charging LED is lit).
-Maybe this is Normal??
It does show charging when power on and connected to Charging Adapter.
I will post pictures when I get home today.
Last Pic:
Basically Gutted bad PDMI Socket and Shove MicroUSB port in PDMI frame.
Looked up Pin out for PDMI and Micro usb for data +-.
DJ_MiX said:
Since it almost impossible to find a PDMI Port, I retrofited a MicroUSB port.
I even contracted FOXXCON, got a reply contract DELL for replacement part.
I have Charging and Data + / - (Detected by PC) working fine.
Only Issue is that the device shows it's not charging when Power ON and connected to PC (Hardware Charging LED is lit).
-Maybe this is Normal??
It does show charging when power on and connected to Charging Adapter.
I will post pictures when I get home today.
Click to expand...
Click to collapse
Are you able to reach Fastboot with this mod?
PDMI connector to mini usb connector
Hello man. My name is Mario. I come from Italy. I'm a psychologist,but on the spare time I like to play with linux & mobile & tablet & technology in general. I was searching for a OTG adapter that was able to recharge my nexus 10 and at the same time that accepts an external sd card and someone has suggests this to me :
eKit 4 in 1 Data Sync Connection Kit For Samsung Galaxy Tab 2 10.1 & Note 10.1
you can read the full story here :
http://android.stackexchange.com/qu...ard-and-recharge-the-battery-at-the-same-time
the problem is that I haven't read very well what he says and I haven't understood that it is not good for the nexus 10. For this reason I have tried to search a way to convert the PDMI connector to a mini usb connector and I have found this thread. I would like to ask you if I can make the same thing that you have done and if you can tell me which electric modification I have to make to the board of this connector to convert it as a mini usb connector. Thanks.