Database Develop

How is the USB OTG supposed to work?

I downloaded Nook Tweeks, enabled USB host mode and External vBus, but nothing happens when I connect a USB-stick via a micro ubs to usb converter.
Am I supposed to do something else? Or does the USB-stick have to be in some special format?

BrotherZero said:
I downloaded Nook Tweeks, enabled USB host mode and External vBus, but nothing happens when I connect a USB-stick via a micro ubs to usb converter.
Am I supposed to do something else? Or does the USB-stick have to be in some special format?
Click to expand...
Click to collapse
I got the same exact problem. It didn't seem to work at all.I think I'll have to order the adapter to see if the problem is the OTG cable or not

dannghiem0801 said:
I got the same exact problem. It didn't seem to work at all.I think I'll have to order the adapter to see if the problem is the OTG cable or not
Click to expand...
Click to collapse
I ordered some cheap ones from DX, but since there are two of them and none of them works I'm assuming it's the Nook the problem is with.

BrotherZero said:
I downloaded Nook Tweeks, enabled USB host mode and External vBus, but nothing happens when I connect a USB-stick via a micro ubs to usb converter.
Am I supposed to do something else? Or does the USB-stick have to be in some special format?
Click to expand...
Click to collapse
It could be the USB-sticks are trying to draw too much power. The Nook host port will only supply low power USB devices (<100mA) and it is also best to have a fairly well charged battery. Some sticks work and others don't.
If you have a powered USB hub then this supplies the power so there is no problem. So try with a powered hub to at least see if that is the issue.

bobtidey said:
It could be the USB-sticks are trying to draw too much power. The Nook host port will only supply low power USB devices (<100mA) and it is also best to have a fairly well charged battery. Some sticks work and others don't.
If you have a powered USB hub then this supplies the power so there is no problem. So try with a powered hub to at least see if that is the issue.
Click to expand...
Click to collapse
I used the same USB in this chart Nook Color USB HOST Device Compatibility List Sandisk Cruzer 8GB on CM7
I bought the Nook Color is to connect it to my camera via DSLRcontroller but so far still not successfully with USB stick.

Read my thread , it should answer most if not all your questions
[23 Jan 2012][USER/DEV] USB Host Support & Development [CM7/CM9]
I'm hoping to get some free time and update it this weekend with more info and probably a widget

I could never get usb host working on cm7. I have been trying to use RYC usb to control my Nikon Dslr . Once i switch over to CM9 beta it worked first time.
Sent from my Nook Color (CM9 ICS Beta)

Dj-Gutz said:
Read my thread , it should answer most if not all your questions
[23 Jan 2012][USER/DEV] USB Host Support & Development [CM7/CM9]
I'm hoping to get some free time and update it this weekend with more info and probably a widget
Click to expand...
Click to collapse
I have read this thread over and over again. Ill try to run CM9 soon to see if it works
Sent from my NookColor using Tapatalk

CM7 also shouldn't give you any trouble , as long as its FAT32 and you are using a hub
can you explain what exactly have you tried and provide logs?

I didnt use usb hub,just enable the usb host mode in Nook Tweak app and plug my usb via otg cable.
Sent from my MB508 using XDA App

Then you didn't read good enough the thread or the chart..
You need an external hub ( powered or non-powered ) to work with the sandisk cruzer.

Thanks a lot, i ll order one and try it out.
I tried to connect with my camera but nothing happened,I guess I have to try with usb hub as well
Sent from my MB508 using XDA App

Raspberry pi , Power Supply

I want your experience in psu schematics.This is my plan, I will buy a cheap usb hub,,I will power it with dvd player smps 5V at the same time it will supply parallel to pi micro usb socket.My question is ,Do you cut the upstream power from usb hub when you are connecting the hub? do you left it as it is,,may be a diode is present.

PREMOLIKES said:
I want your experience in psu schematics.This is my plan, I will buy a cheap usb hub,,I will power it with dvd player smps 5V at the same time it will supply parallel to pi micro usb socket.My question is ,Do you cut the upstream power from usb hub when you are connecting the hub? do you left it as it is,,may be a diode is present.
Click to expand...
Click to collapse
While I can't answer specifics on what wires to connect I would recommend taking a look at this great guide to building your own PSU for the RPi http://elinux.org/RPi_5V_PSU_construction. This includes circuit diagram layouts.
Sent from my SCH-I535 using xda premium

I have my Pi powered from one of the normal USB ports. The power comes from the 'power' cable of the USB hard disk that is attached to the Pi. The hard disk's main USB cable is plugged into a powered USB hub.
Attached an image.

Do we need push more mA into her. mines running off my Tab2`s charger at the moment which is 2 Amps..??

lodger said:
Do we need push more mA into her. mines running off my Tab2`s charger at the moment which is 2 Amps..??
Click to expand...
Click to collapse
That should be enough amps as most phone and tablet chargers will provide the 5-5.6V of power needed for the RPi to function properly.
Sent from my SCH-I535 using xda premium

2A will be sufficient to power a couple of peripherils including pi itself.

powered USB hub...
Hey guys, it seems ive got power issues with my pi, everything works fine if i just use the two usb ports, but as soon as i plug in my powered usb hub i get keyboard errors, bluetooth dropping, and wifi connection issues, all symptoms of low power. anyone having this issue with thier Raspi & powered usb hub?

justanotherlurker said:
Hey guys, it seems ive got power issues with my pi, everything works fine if i just use the two usb ports, but as soon as i plug in my powered usb hub i get keyboard errors, bluetooth dropping, and wifi connection issues, all symptoms of low power. anyone having this issue with thier Raspi & powered usb hub?
Click to expand...
Click to collapse
Exactly how do you have everything plugged in?
Assuming power to pi from one source, hub to the USB port and your accessories all to the hub: See if you can get your pi to boot with the hub plugged in to the accessory port but nothing to the power micro USB.
I suspect the hub may be causing issues by backfeeding power through the accessory port. This test will tell.

powered USB hub...
cjdalessio said:
Exactly how do you have everything plugged in?
Assuming power to pi from one source, hub to the USB port and your accessories all to the hub: See if you can get your pi to boot with the hub plugged in to the accessory port but nothing to the power micro USB.
I suspect the hub may be causing issues by backfeeding power through the accessory port. This test will tell.
Click to expand...
Click to collapse
You guessed correctly to how i had it all set up. I did exactly what you said, tried booting, but got nothing. i dont think its backfeeding, any other suggestions? this one leaves me scratching my head.

justanotherlurker said:
You guessed correctly to how i had it all set up. I did exactly what you said, tried booting, but got nothing. i dont think its backfeeding, any other suggestions? this one leaves me scratching my head.
Click to expand...
Click to collapse
Are you using seperate power for usb hub ?If it is so you should cut the power terminal from usb hub to pi.See that you are supplying good current to the hub.

Micro USB Host OTG Cable with Micro USB Power

Found this cable on Amazon. This seller is in US and can ship faster I believe...
http://www.amazon.com/Micro-Cable-Power-Samsung-AtomicMarket/dp/B009YPYORM/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1357870142&sr=1-1-catcorr&keywords=otg+y+cable

Will this cable allow for powering a USB device while using the device? Also, will it permit charging the tablet while using the USB device?

Dale M said:
Will this cable allow for powering a USB device while using the device? Also, will it permit charging the tablet while using the USB device?
Click to expand...
Click to collapse
I believe you can power the secondary device, but without a custom kernel, you cannot power the tablet while OTG device is connected. I know someone made a kernel or two for the N7 but it will not work with our devices. Plus, with a pogo cable, you can just charge and OTG at the same time.

Manual USB OTG working

Hi,
As you know, the Nexus 4 doesn't support USB OTG, meaning you can't use it with USB drives, gamepads, etc.. One reason is that the device doesn't seem to provide the neccessary 5V, the other reason is that it's not supported by the kernel.
So, I've been digging a bit, and now I can claim partial success! It's possible to supply the 5V yourself, and then activate USB host mode manually. It's a bit cumbersome, but for the beginning better than nothing. I tried a mouse and USB drives.
I should warn you that this is just a proof of concept and nothing that you'll want to use on a daily basis. Regular USB doesn't work properly while running this kernel, and I haven't checked battery consumption. Also this is based on Android 4.2.1, and if you have 4.2.2 you might not be able to make calls. That shouldn't be a problem as this is for testing only, though. Just let me say, I can't guarantee for anything, and I'm not responsible if you brick or blow up your phone.
You'll need:
- A USB OTG cable
- A USB Y cable to provide the 5V (It has two USB-A plugs and one USB-A socket.)
- My custom kernel
- Unlocked bootloader
- Android developer tools (adb, fastboot)
Load the boot image on your phone (this is not permantent):
Code:
$ fastboot boot myboot.img
Connect everything as follows (should be obvious):
- Y cable power plug (typically red) to the PC or adapter
- Other Y cable plug into the OTG cable
- OTG cable into the phone
- USB device into the Y cable socket
You need a remote shell on your device. Use adbWireless or similar to enable ADB over WiFi, then do:
Code:
$ adb connect 192.168.0.108:5555
(or whatever your phone's IP is)
$ adb shell
Now you should be on your phone. Do
Code:
[email protected]:/ $ ls /sys/kernel/debug/msm_otg/
and you should see 'mode' if the new kernel works. Now become superuser and enable USB host mode:
Code:
[email protected]:/ $ su
[email protected]:/ $ echo host > /sys/kernel/debug/msm_otg/mode
To disable USB host mode, use "none" or "peripheral". Note that at this point, I couldn't get it to go into regular USB mode. This means that MTP and adb over USB doesn't work yet.
Connect a device, and you should see more than two entries under "lsusb". Congratulations, your Nexus 4 has just recognized it's first USB device! If you install Stickmount (you have to sideload it since it's marked as not compatible), you can mount USB flash drives. Nexus Media Importer doesn't seem to work, though.
How does this work?
Basically, I just added the following line to the beginning of msm_otg_debugfs_init in msm_otg.c:
Code:
motg->pdata->otg_control = OTG_USER_CONTROL;
This enables the mode file in debugfs I use for mode switching. The next step would be to enable manual mode switching while keeping regular USB support, which shouldn't be too hard. Later down the line we can think about switching automatically on cable insertion, and maybe event getting 5V out of the device, but that would be a lot harder.
So, try it out, let me know if it works for you, and feel free to tinker around and improve what I've got!

Nice to see some progress going. Only thing that irks me is the Y cable though, kinda defeats the purpose of OTG to me...
Thanks a bunch for your work though!
Sent from my Nexus 4 using xda premium

You are a genius. :good:
Just connected a powered USB-HUB and a mouse to my OTG cable, flashed the kernel and typed the commands directly with a terminal app on the device.
It simply works !!!

Awesome development, one of my biggest gripes was the lack of USB OTG, I just assumed it was included as stock, that's why part of the reason I purchased this device.

This is awesome. Going to have to order some cables now. Since we have to supply power anyway, is it possible to support usb-otg + charging? Figure the phone is "too thin" anyway... I'll probably be making a 64gb microsdxc + battery case for the phone. Hello extended battery life.

Great work, I was just looking for this yesterday. Would it work with a USB dac (Assuming I had a powered usb hub)? Just asking because I think usb audio is often overlooked, and I would really like to have it.

Nice!

It would also be interesting to see if the slimport adapter allows otg pass through (their website says it does)... Then that's HDMI +charging +mouse/keyboard. Even miracast + mouse/keyboard would be awesome
Sent from my Nexus 4 using Tapatalk 2

Flynny75 said:
Even miracast + mouse/keyboard would be awesome
Click to expand...
Click to collapse
we've already got that, haven't we?

Finally! Now I will get to use my 1TB Portable HDD!!
My 8 gig is FREE! Lol
Sent from my Nexus 4 using Tapatalk 2

I'd like to be sure I'm getting a good USB Y cable. I see a few on Amazon, some have the word 'Power' in them, some don't. Most don't have a red plug. Are there some specific characteristics I should look for in the description to know that it's suitable for this purpose?
Here's one example that does NOT say 'Power' in its description.
http://www.amazon.com/OEM-UTStarcom-USB-Adapter-Cable/dp/B002W8EDOM/ref=pd_sim_e_2
Thanks, CaptainMuon, for your terrific work!
EDIT: After reading Scorpio16v"s post (and watching his video...thank you!), I thought I would try with a powered hub, since I don't have the Y cable. Also, I used the terminal emulator instead of adb, as he suggested. YES! It worked with a USB micro sd card reader adapter (I had bought it from ebay specifically for this Nexus 4 since I knew there was no sd card slot). That required stickmount, as CaptainMuon mentioned. Then I tried a USB mouse, and that worked also. This is great!
I'd still like to know more about the Y cable, as I asked above, even though this other method worked well for me.

Wonderful!!

R: Manual USB OTG working
Can the USB hub be non powered?
Inviato dal mio Nexus 4

Cice96 said:
Can the USB hub be non powered?
Inviato dal mio Nexus 4
Click to expand...
Click to collapse
When I powered off my USB powered hub, neither the USB Micro SD or the USB mouse worked.

Greaaatt news and excellent development on this front sir.
I was eagerly waiting for someone to come up with a solution to this topic.
But coming back I've read in so many places that a kernel can be tweaked so as to supply 5V to the socket!!(I'm considering that is the problem here. With power supply its working).
??
Sent from my Nexus 4 using xda app-developers app

Awesome, my one gripe with the phone is now (almost) gone!:good:
Any chance it it'll work with non-OTG cables/adapters (The plain USB host ones which don't have that extra pin)?

Just posting to thank you for all the time and effort you must of put in.

ziddey said:
This is awesome. Going to have to order some cables now. Since we have to supply power anyway, is it possible to support usb-otg + charging? Figure the phone is "too thin" anyway... I'll probably be making a 64gb microsdxc + battery case for the phone. Hello extended battery life.
Click to expand...
Click to collapse
It seems to be charging in USB host mode. (In my Y cable, the +5V line connects all three plugs, so the phone gets juice too. Not sure if that's always the case.) We have to do some testing to see if it charges at normal speed, etc.
eiriklf said:
Great work, I was just looking for this yesterday. Would it work with a USB dac (Assuming I had a powered usb hub)? Just asking because I think usb audio is often overlooked, and I would really like to have it.
Click to expand...
Click to collapse
I guess, if it is supported on any other android device, it should be possible here. Would be great if someone with a DAC would try it!
Flynny75 said:
It would also be interesting to see if the slimport adapter allows otg pass through (their website says it does)... Then that's HDMI +charging +mouse/keyboard. Even miracast + mouse/keyboard would be awesome
Click to expand...
Click to collapse
Dito. If someone has such an adapter, I'd be excited to know if it works.
sga999 said:
I'd like to be sure I'm getting a good USB Y cable. I see a few on Amazon, some have the word 'Power' in them, some don't. Most don't have a red plug. Are there some specific characteristics I should look for in the description to know that it's suitable for this purpose?
Here's one example that does NOT say 'Power' in its description.
http://www.amazon.com/OEM-UTStarcom-USB-Adapter-Cable/dp/B002W8EDOM/ref=pd_sim_e_2
Click to expand...
Click to collapse
Hmm, I don't know how you could make a Y cable that doesn't provide power from one end, and data from the other . It should work, but I know there are a lot of scam/poor quality cables out there, so I can't guarantee it. I've got this one:
http://www.amazon.de/Delock-Adapter...=sr_1_4?s=ce-de&ie=UTF8&qid=1361096352&sr=1-4

Yes good through bro...well done
But ohhhh man...i hate to use extra stuff like y cable and a powersource....
F**k google
Sent from my Nexus 4 using Tapatalk 2

you should post this to development section ;
let's see if other dev can also contribute to make a nice working kernel with these stuff;
without any bugs you had mention above.
BTW ;
Nice work Bro. :good:
by the way ; i can use my powerbanks as the power source. so i don't need any land electric sources.
not yet try it, i will need to find the XY cable first ( non powered USB Hub will do fine, and powered by the 11000Mah Powerbanks )

USB Port

Does the USB port have any other function other than power?

Don't think so, only power AFAIK.

I plugged it into my computer and even tried pressing and pressing/holding the button on the Chromecast but my computer didn't indicate any hardware plugged in.
I wonder if the data pins are even wired to anything internally.
UPDATE: The USB cable that comes with it may not work for data transfer, tried it with my phone and it didn't work. So I tried a normal microUSB cable but still nothing.

spunker88 said:
I plugged it into my computer and even tried pressing and pressing/holding the button on the Chromecast but my computer didn't indicate any hardware plugged in.
I wonder if the data pins are even wired to anything internally.
Click to expand...
Click to collapse
If we could plug a mouse or keyboard into it would be great!!

comatose1978 said:
If we could plug a mouse or keyboard into it would be great!!
Click to expand...
Click to collapse
It has bluetooth... so in theory that could be a simple alternative... we just need to figure out how to access hidden menus.

comatose1978 said:
If we could plug a mouse or keyboard into it would be great!!
Click to expand...
Click to collapse
I tried this with a self powered USB OTG cable, just to see if the Chromecast would blink, bing, or do anything to show recognition, no dice. Also tried booting with a USB drive in, no difference.

Universal Charger
Universal Charger:victory:

Examining board
Based on examining the photos of the motherboard on ifixit.com...
Component EM1 appears to be a USB Common Mode Choke. That goes on the D+/D- pair which you can see routed from the USB port, so it wouldn't be present if there wasn't some use for data communication over the USB port. (Cost sensitive equipment.) The flip side of the PCBA shows TP1-TP20 (Where TP19 and TP20 appear to be GND). My guess is in that mix you have a JTAG port for programming/testing the unit initially with a pogo pin rig (evidenced by the dimples observed in each of those locations), and there might be more high/low GPIO pins where one might allow the unit to enter its USB data mode.
-Jon

ften said:
I tried this with a self powered USB OTG cable, just to see if the Chromecast would blink, bing, or do anything to show recognition, no dice. Also tried booting with a USB drive in, no difference.
Click to expand...
Click to collapse
Is there any special kind of powered otg cable to work with this? I looked on Amazon but not sure. I want to grab one incase they make any progress on rooting this.
Sent from my HTCONE using Tapatalk 4 Beta

mustang_52 said:
Is there any special kind of powered otg cable to work with this? I looked on Amazon but not sure. I want to grab one incase they make any progress on rooting this.
Sent from my HTCONE using Tapatalk 4 Beta
Click to expand...
Click to collapse
Looks like its already been rooted. With what looks like a dual usb otg. They don't go deep into what specific cable but, I would guess it is a generic dual usb one off ebay, or amazon, heres a quick one i pulled from amazon http://www.amazon.com/Micro-Cable-P...8&qid=1375052489&sr=8-3&keywords=Dual+Usb+otg
But if you read into it, they say you can root, but unless your a developer you probably wont get any benefit of rooting....yet, if at all.
Obtaining root Link: http://blog.gtvhacker.com/2013/chromecast-exploiting-the-newest-device-by-google/

OneAn9ryN00b said:
Looks like its already been rooted. With what looks like a dual usb otg. They don't go deep into what specific cable but, I would guess it is a generic dual usb one off ebay, or amazon, heres a quick one i pulled from amazon http://www.amazon.com/Micro-Cable-P...8&qid=1375052489&sr=8-3&keywords=Dual+Usb+otg
But if you read into it, they say you can root, but unless your a developer you probably wont get any benefit of rooting....yet, if at all.
Obtaining root Link: http://blog.gtvhacker.com/2013/chromecast-exploiting-the-newest-device-by-google/
Click to expand...
Click to collapse
Please correct me if Im wrong, but the cable you linked only charges the thumbdrive/keyboard/mice/etc NOT the Chromecast so how would one root it since it does need power from usb plug? I've been searching for correct cable and cant find it; link to correct cable would be greatly appreciated!!!
This cable wouldnt work, right? http://www.ebay.com/itm/Usb-type-A-..._USB_Cables_Hubs_Adapters&hash=item4857e3608e

eurominican said:
Please correct me if Im wrong, but the cable you linked only charges the thumbdrive/keyboard/mice/etc NOT the Chromecast so how would one root it since it does need power from usb plug? I've been searching for correct cable and cant find it; link to correct cable would be greatly appreciated!!!
This cable wouldnt work, right? http://www.ebay.com/itm/Usb-type-A-..._USB_Cables_Hubs_Adapters&hash=item4857e3608e
Click to expand...
Click to collapse
I own that cable from Amazon and it should work. It brings in +5v from a charger connected to the female microUSB port and then splits it to the female full size USB port and the the male microUSB port so both the USB host device and the USB peripheral device are getting power.

spunker88 said:
I own that cable from Amazon and it should work. It brings in +5v from a charger connected to the female microUSB port and then splits it to the female full size USB port and the the male microUSB port so both the USB host device and the USB peripheral device are getting power.
Click to expand...
Click to collapse
I ordered this cable http://r.ebay.com/QgwBIW Will report back if it works when I get it.

eurominican said:
Please correct me if Im wrong, but the cable you linked only charges the thumbdrive/keyboard/mice/etc NOT the Chromecast so how would one root it since it does need power from usb plug? I've been searching for correct cable and cant find it; link to correct cable would be greatly appreciated!!!
Click to expand...
Click to collapse
I also bought that powered OTG cable off Amazon and it will power the Chromecast as well as provide the means to flash the Chromecast via a USB thumbdrive. When you apply power to the Chromecast, it automatically flashed the bin from the USB drive. There was no interaction required (or even possible). Of course this was on the original firmware - if your Chromecast updated itself, you have lost the ability to root the device at this time.
Clearly the Chromecast does sense the USB drive and pulls data from it during the initial boot sequence. However I'm not sure if it would ever work for other devices such as keyboards or storage devices, etc.
I'm not sure why anyone would want to hook those types of devices up to the Chromecast however. Once you have root, you can telnet into the device, so adding a keyboard doesn't seem that important. The whole idea of the device is that you send it media from other devices and control it via that other device. Adding storage for example doesn't seem important since it can pull media off the network already (ie a NAS or another computer).
Anyway. That has been my experience with it so far. It's a long winded answer to more than just your question about the OTG plug.

I would personally love the ability to send audio out without having an hdmi TV be on through the usb somehow...
Sent from my Nexus 7 using Tapatalk 4

USB Tethering not working - SGH-i997
Hi all,
i have install Avatar 7.0 to my Samsung SGH-i997 from "http://forum.xda-developers.com/showthread.php?t=2174227". it's look cool.
But when i am trying to USB Tethering, the massage shows as "Unfortunately,Setting has Stopped".
how to Fix this issue.