yashsingh1/xdaforums huggingface dataset:
[TouchPad General] spunker88:
Flash drives and some memory card readers will also work, more details in the first post. But like I said for diagnostics purposes you can plug in anything and USB Device Info should show an entry under the Linux tab. For example USB printers are NOT supported under Android yet they will show up in USB Device Info.
[TouchPad General] mpgrimm2:
I am 99.5% certain that your Samsung USB Charger has the 2 "data" pins shorted together (D- and D+) to tell the phone to use "AC Charging" mode, just like the HP TP charger does.

You can verify this by plugging the phone in with a standard cable and going to "settings" "power" (or battery) and checking the "Battery Status". It will either say "USB Charging" (Data working with 500ma max charge rate) or "AC Charging" (Data NOT working, with max charge rate allowed by phone/charger).

So the next limiting factor is the OTG cable you are using and whether or not it "isolates" the 5v USB charger "power" from the data lines (based on how the manufacturer "wired" the cable. Post a picture of your "Complete" setup and link to the cable you are using. Examples of the OTG cable wiring schematics can be found in my post OTG Tips & Tricks post.

If you are using cable schematic #1 (I think you previously indicated you just added the pin 4 to 5 jumper), then this may be your problem because as soon as you plug it into "most" standard chargers, it will "kill" the data communication, but keep the device powered. I will add that your homemade cable will work with the CrazyOnDigital 2 port charger without any mods. See my 2 Port 2 Amp OTG Charger & Mod post in the TP Self Powered OTG Port thread for more info.

I've attached some pictures of one of my "working" setups using only standard/purchased hardware and the "applecable" powered OTG cable (linked in OTG Tips & Tricks thread where I originally posted the pictures.) See schematic #2.

That thread also has a walk through for modifying a standard "HTC" charger to be USB OTG compatible, but I don't know what the insides of your Samsung model look like to know if the same mod is possible (it's likely).
[TouchPad General] spunker88:
Forgot about the data pins being shorted in some chargers, that would certainly mess up device communication. The way I built my OTG cable is like your #2 diagram. I took a standard OTG cable (microUSB male to USB female) and then spliced in the +5v and ground to a short USB male cable. So on the cable coming from the charger the data pins are left floating.
[TouchPad General] chinna_rao:
Hi...this is what I did...I have three dpoferent cables...

1.USB male(data pins not connected)

2.USB female

3.micro USB male(pins 4&5 already shorted)

I joined the USB female and micro USB male color to color...

Then I joined only the power wires of the USB male onto this..(so how does the charger data pin short/not shorted still affect the USB male when only power wires are being used from charger)

That's all I did...
[TouchPad General] mpgrimm2:
Your homemade cable sounds like you wired it correctly according to schematic #2, if I understand you correctly? ( I can't tell from low resolution pictures). Unless there is an error in your homemade harness, it should work with the standard charger. I still recommend buying the AppleCable harness, or at least redo your harness again.

Sent from my "Up all night, sleep all day" HP CM9 Touchpad
[TouchPad General] chinna_rao:
I just redid my cable to show u guys how I wired it up according to schematic 2....

Anyway..I just ordered an otg cable and a y cable(with 2 male and 1 MINI USB)...

The otg cable:

http://www.ebay.in/itm/321032948755?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

The y cable:

http://www.ebay.in/itm/360529278396?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

So if I just wire the micro USB part after removing the mini USB will it work?

And do I still have to hack my Samsung mobile charger?

sent my from my HP Touchpad
[TouchPad General] mpgrimm2:
I don't know that that will work out for you ('Maybe' if you put a full size Female usb). Instead of cutting up cables, why not just get the Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay)? Unless that's not an option in your country.
[TouchPad General] chinna_rao:
I don't have that available in my country...I forgot to add that I would change one of the male port into a female one...I have the USB female port cable which I cut in half earlier...will that work successfully?

sent my from my HP Touchpad

---------- Post added at 07:08 PM ---------- Previous post was at 06:58 PM ----------

Awwww.....dang!!!!!

Didn't see that the shipping was free worldwide...ordering it now!yippee Kay yay!

Thanks a lot for the info....

Btw I already spent (and wasted)over 15dollars of my money...:'(

sent my from my HP Touchpad

---------- Post added at 07:38 PM ---------- Previous post was at 07:08 PM ----------

Placed an order for that and a 7 port USB hub!

Awesome....just can't wait to get my hands on em...thanks again mpgrimm2!

sent my from my HP Touchpad
[TouchPad General] chinna_rao:
I have a question guys....

Would I be able to use a USB gamepad controller on my touch pad?the old controller which I lost free years ago didn't require any drivers...so will it work on my touch pad?

sent my from my HP Touchpad
[TouchPad General] mpgrimm2:
Since you don't seem to mind cutting up some of your cables, here are some other items/mods you might be interested in that are linked in my post here.
[TouchPad General] chinna_rao:
Am I getting this right?do u mean that it is possible to both charge and use otg function both at the same time?

sent my from my HP Touchpad
[TouchPad General] mpgrimm2:
On my Evo3d, I can say yes to charging and otg at the same time. On the HP TP it's seems to be one or the other, although I've seen it work occasionally, but not consistently (in my experience so far) "possibly" due to charger output (amps).

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] MainCourse:
Powered Hub?

Hey all

I have a powered Belkin USB hub (this one: http://www.belkin.com/us/F4U040-Belkin/p/P-F4U040), coupled with an OTG cable which I know work together, as my Kindle Fire recognizes all USB devices through this setup (Keyboard, Mouse, Flash Drive etc).

I was surprised to find that my HP touchpad does not recognize any devices connected to this hub.

I did some diagnostics with USB Device Utility, and the touchpad recognizes my USB OTG cable, as it shows as a 'Qualcomm On-Chip EHCI Host Controller'.

The touchpad simply does not see anything plugged into the hub, be it a keyboard, mouse or flash drive.

Please help me here, guys!

What am I doing wrong?

Thanks
[TouchPad General] mpgrimm2:
MC,

The product page for the hub doesn't mention or show the hub being externally powered which is needed on the TP. A few things...

- Take a picture of your connected setup for me and of the individual pieces (links for each would be helpful, ie the otg adapter you are using).

- What rom are.u running? (works on latest cm9/10)

Here's one of my setup examples for the TP from the OTG Tips & Tricks thread

and another version here.

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] MainCourse:
Definitely powered

I am 100% sure it is powered.

Check my photo:

I am running jcsullins latest CM10

Thanks :cyclops:
[TouchPad General] mpgrimm2:
I found a link at TigerDirect that showed better pictures. It's possible that the hub just won't work with the Touchpad vs. the KindleFire, ie..

- My $7 4 port hub from AppleCable (in my previous link) works well with any otg adapter on all my devices (Evo3d, LG optimus G, moto xyBoard, HP Touchpad, winPC & nephew's Gs3).

- My fancy $30 5in1 OTG/MHL powered adapter with Multi Card Reader & USB port from Juiced Systems only works correctly on the xyBoard and Gs3.

Ideally, you should be using a powered USB OTG cable (only one full size female port) ahead of the hub to verify otg on the TP with a mouse before adding in the hub/kb etc to help with trouble shooting (also in my previous link).

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] MainCourse:
Hmmm. It doesn't work on my Moto RaZr either... :confused:

I don't see why it shouldn't

Will muck around with it, if it doesn't get anywhere, it's not a big deal

Thanks :)
[TouchPad General] amkaos:
you dont specify that you also run a mount app .. stickmount or such..

you need to get it, open it first..

or HPTP will not mount peripherals instead it will want to charge .
[TouchPad General] spunker88:
You probably need to provide +5v to the USB hub's input to turn on the hub. This would usually be provided by the host device and is isolated from the +5v provided by the hub on its ports. You can splice or buy something that allows you to supply +5v from one of the hub's host USB ports to its input port. My hub also refuses to work unless there is +5v on the input even though its powered.
[TouchPad General] amkaos:
his pic shows the hub being powered
[TouchPad General] MainCourse:
Guys, guys, guys

It's powered, it works perfectly on my Kindle Fire, therefore it should work on my RaZr and my Touchpad.

Mice light up on the KF, but not on the RaZr or touchpad.

I know you guys might not have a heap of experience with the RaZr, but it uses the same OMAP4430 as the Kindle Fire, so I would assume it would work.

It should all work, but nothing works.

Does anyone have any suggestions on what I can do to get it working?

Thanks :D

---------- Post added at 07:48 PM ---------- Previous post was at 07:45 PM ----------

I just had another thought...

Could I use my Touchstone to power the touchpad while OTG is plugged in, as some of you state I need to put ANOTHER power source to the Touchpad.

Also, I have stickmount installed, doesn't help

:/
[TouchPad General] mpgrimm2:
MC,

I've seen differences in the way some OTG adapters/devices work from one Android device to another whether or not they have the same chipset/cpu (ie my Evo3d has the same 80x60 as the TP but the EVO3D kernel has better support/drivers for OTG)

You can see pictures of my hardware & working OTG setup with links in the OTG Tips & Tricks Thread. At the very least I think you should pick up the OTG Adapter with power $7. You may find that your hub will work through that cable. The applecable hub $7 works also.
[TouchPad General] spunker88:
The hub is powered, but the input to the hub meaning the cable going from the hub to the touchpad likely has no +5v on it and that may be causing the hub not to work. This +5v would usually be supplied by the computer and is used as a signal to turn on the hub since the hub supplies its own power to its host ports.

So for this setup you would want something like the picture I attached. You tap into the +5v from one of the powered ports and splice it to the main I/O usb cable that runs from the hub to the Touchpad. Or you could probably splice into the hubs external power cable since its likely supplying a regulated +5v.
[TouchPad General] dylansmith:
just curious - why would the TP not take OTG directly without a source of secondary power? talking about low-consumption devices like card readers/thumbdrives, rather than 3.5" hdds..
[TouchPad General] mpgrimm2:
While the Qualcomm host controller chip supports OTG functions, HP decided not to design/add in the supporting circuitry needed to implement it correctly (financial reasons likely).

Basically the TP doesn't have the needed voltage regulator to supply +5v backwards out of the microUSB port.

(It is possible to add a secondary powered port, see my signature)

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] questionesse:
Anyone found an active listing?

Can't come up with one...
[TouchPad General] mpgrimm2:
Have u tried the Otg Tips & Tricks Thread link 3 posts up.

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] questionesse:
Applecable has no listings currently and there's no link activitie for such a cable...
[TouchPad General] mpgrimm2:
Strange. Did not expect to see an absence of Applecable items. I see.similar items.suggested by eBay when clicking your link. Let me wee if the Applecable hub pulls up from the thread.

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] questionesse:
But no y cable with a full size male, or am I blind?
[TouchPad General] mpgrimm2:
[URL!=http://myworld.ebay.com/applecable?_trksid=p2047675.l2559]AppleCable's EBay Page[/URL] shows them away/not taking orders until Feb 12th. You can view their store link from the linked page also.

Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay)

Not working.

Link for Applecable's USB 2.0 3 Port Hub with data Sync Charger cable for $7 still works.

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] questionesse:
yeah I just expected others to sell such cables as well...

thx though
[TouchPad General] mpgrimm2:
Here is a similar one..http://www.ebay.com/itm/Micro-USB-H...568862?pt=PDA_Accessories&hash=item3a78030c5e

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] unmesh59:
I found an applecable listing! It is now $7.

http://www.ebay.com/itm/Micro-USB-Host-OTG-Cable-With-USB-power-fo-Samsung-S2-i9100-S3-i9300-i9220-i9250-/160913641259?pt=PDA_Accessories&hash=item2577334f2b

I'm hoping I can use it with a OBD2 car diagnostic port reader that has a USB port.
[TouchPad General] mpgrimm2:
You'd better check the OBD2 manufacturer's info to make sure they have driver/android app for it that supports USB OTG (you will also have to provide power to the OTG adapter) . My understanding (from friends & mechanics) is that most OBD2's with USB are for windows PC's and that the ones that work with Android/Apple devices are Bluetooth OBD2 adapters that work with a paid app from the market.
[TouchPad General] spunker88:
Torque Pro says it supports USB on Honeycomb or newer so there is a chance it will work. Let us know your results and I'll put it in the first post.
[TouchPad General] unmesh59:
I have a OBDlink SX over USB which works well with a PC but am hoping for the best with the separately-powered OTG approach and Android rather than buying a new one.

Torque Pro is indeed the app that I want to use. I will post on this thread if the combination works, else it will have merely been an investment for science :)
[TouchPad General] unmesh59:
Finally got around to trying it and it worked!
[TouchPad General] smke:
Has anyone gotten OTG to work with CM10 on the Touchpad yet? The USB Host Diagnostics app tells me there is no kernel support. Do I have to go back to CM9 or is there some other way?
[TouchPad General] spunker88:
What CM10 ROM are you on? Works fine for me on SGA's CM10 with -4mA sleep ROM.
[TouchPad General] mpgrimm2:
Also works on JcSullin's Cm10 experimental preview 3/4/13 release.

Keep in mind that you must have an externally powered otg adapter or hub for it to work. (I have received bad otg adapters from online stores before).

http://xdaforums.com/showthread.php?t=2147284

[ROM] [03/04] How to install jcsullins CM10 Unofficial Preview Builds Edited 3/19/13

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] smke:
Thanks, I'm on that same ROM. I tried it again with my monitor's USB hub. The Host Diagnostics app now says that there is support, but I can't get anything I plug into the hub to actually work (thumb drive with StickMount, wired mouse, wireless keyboard). Maybe the hub in the monitor isn't properly powered. I've got a powered OTG Y cable on the way from eBay so I'll try it again then.
[TouchPad General] smke:
I got the Y-cable and everything seems to be working fine when it's plugged directly into the charger. I have one of those external battery packs and I can't get any OTG working with that as the power source. Is there something I can do to the cable to make the external battery pack provide power to the usb devices?
[TouchPad General] mpgrimm2:
SMKE,

I don't recommend those USB "y" adapters because if it gets plugged into a typical usb charger with an OTG adapter it will kill data communication because most chargers have the "data" pins shorted together to enable "fast charge" (vs USB Charging under battery settings) . The OTG adapters with the 'power' pigtail are usually isolated from the power source to prevent this from happening.

Some iPad compatible chargers do not have the pins directly shorted. It's likely that your Battery Pack does. 2 options. Crack open the pack and figure out a way to cut/isolate the pins at the port or make/find an adapter cable to isolate power from the data lines on the cable from the pack.

You may find this info helpful..

I've used this OTG Cable setup with both CM9 Nightly & CM10 preview. I typically stay on the latest CM9 Nightly for the solid adobe flash support.

The OTG cable from the "other" seller should work, all of them come from china anyway.

If interested, read through that [Tips and Tricks] OTG (USB Host Support) thread for various ways to make homemade OTG cables to isolate power from the TP/OTG device. In post 2 you will see some USB OTG schematics (look at #2 & #3) . All OTG adapters/cables will require pins 4&5 shorted together to signal the phone/tablet that a device is being plugged in for OTG use (sometimes the purchased OTG cables don't work b/c this "jumper" is missing/defective).

Here's some updated AppleCable Ebay Store links:

USB 2.0 3 Port Hub with data Sync Charger cable (not OTG, but a cheap hub that works. can be modified for OTG)

Micro USB Host OTG Cable w/micro USB power

Left Angled Micro USB Host OTG Cable w/USB power

Right Angled Micro USB Host OTG Cable w/USB power

Sent from my "Up all night, Sleep all day" EVO3D!
[TouchPad General] dylansmith:
has anyone had success with 1 external 2.5" hdd + 1 card reader yet?

my scenario is as follows :

CM9 latest nightly

USB OTG connected to USB hub and AC supply (TP)

1 x 2.5" USB HDD + 1 x CF card reader connected

drivemount installed

only the card reader shows up, hdd won't even spin (but shows green light)

i tried three thumbdrives + 1 card reader simultaneously = works

the only way my hdd can work is to plug only the hdd in, without the usb hub.

is there any workaround for this? it shouldn't be a power problem since there's 2.1A coming from the AC.
[TouchPad General] spunker88:
My 2.5" USB powered drive refuses to fully spin up when connected to my Touchpad even though there is more than enough current available. Its possibly a communication issue where the HDD thinks it can only draw 100mA. Externally powered hard drives will work fine, but they aren't very portable.
[TouchPad General] Ivie:
trouble with a usb stick

Hey, i haven't seen anyone post about this...

I have a lexar 8gb secure 2 flash drive, it works fine on several computers, the lexar lights up red to indicate its working,

well, i have used a couple usb devices on my touchpad now and i've definately got the otg working and powered, but this flash drive will not mount, i have stickmount and usb otg helper installed to mount the drive and esfile explorer does not find it... also the red light is not on when plugged in the touchpad. help please!

Just popped the same drive over to my samsung galaxy s3. Guess what it works... Now I just don't know... it flashed the red light intermittently. i also installed drive mount... it didn't help...
[TouchPad General] Nathanation:
Are you using a Y cable and power supply? You can't just plug a USB device into the Touchpad without adding a power source, the 1st post in this thread explains this. :)
[TouchPad General] mpgrimm2:
As NathanNation mentioned, you can't just plug it in without the correct setup. See my info a few posts up for links and pictures that will help you out...HERE
[TouchPad General] Ivie:
Ya, as i said i have other devices working on it just fine. i have a y cable and it is powered. which is how i got a mouse and keyboard working. the only thing that doesnt work is this flash drive.
[TouchPad General] mpgrimm2:
Have you tried running it off a powered USB Hub yet?

The otg controller in the TP limits "directly" connected devices to 100ma, but devices after a Hub should be able to get the full 500ma USB 2.0 Limit set by the hub. ( Touchpad -> OTG adapter -> Powered Hub -> KB/Mouse/Hard Drive ). This may not be the issue, but if that particular Flash Drive is requesting more than 100ma from the usb port, then it will have to go through a hub. Have you tried a different flash drive (my 16gb Corsair Drive works fine after the hub).
[TouchPad General] Ivie:
Great idea, i will look into this, don't have a hub but ill pick one up. dont have another flash drive to test but i can borrow one, thanks for you help man!
[TouchPad General] Nathanation:
Milaq has now implemented OTG into the latest cm10.1 nightly. I will be testing tonight to see if it works and will report back here.
[TouchPad General] imeem:
I assume we can use USB DACs by doing this?
[TouchPad General] Nathanation:
Well otg did work but not as it did on cm9. In cm9 I got a system notification saying "SD card detected" in cm10.1 I was able to read files from my external SD card but only when mounted by the app stickmount
[TouchPad General] lllGurulll:
So basically, I need to buy the OTG cable AND a external power source just to attach a thumbdrive?

This is why it annoys me so much that some tablet makers refuse to put expandable storage via SDcard slot.
[TouchPad General] mpgrimm2:
Agreed. With the correct OTG 'Y' Cable, you can use your TP's charger to run the OTG setup for low current devices (under 100ma, ie most Mice/Kb's & thumbdrives). If you need to plug in something that requires/requests more (like a HDD & some thumbdrives), you need to pass through a powered hub (some can be powered with an adapter via the USB wall charger). See prior post HERE.
[TouchPad General] shard76:
OTG Kernal support

I am using CM 9-20130714 and trying to get OTG to work without any success.

Is there a specific kernal/rom i need to flash to get this to work?:confused:
[TouchPad General] mpgrimm2:
I can verify it works on CM9 20130714. You need to use the correct OTG adapter with an external power supply/charger. I have bought OTG adapters that were defective. Go back a page or two and I am sure you will see one of my posts with pictures of my setup as well as links to the correct hardware on ebay/amazon.

See post here.. http://xdaforums.com/showthread.php?p=40416348