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Hello I got a USB gender change: A-Female to A-Female so that i could connect a self powered USB Hub to my Archos.
So far i have connected a self power Hard Disk directly into my Archos 70.
Didn't pick it up.
A mouse in the USB Hub.
Didn't pick it up.
A pen drive directly.
Didn't pick it up.
Is the Archos 70 locked down or does the USB Micro B connector they have on the Archos 70 work different?
I thought USB was a universal connector!
... one thing you have to realize is the device needs drivers to work those devices. you just cannot flip flop the connector and expect everything to work. tipically unless the device has a INPUT port which is a standard usb port not a micro or mini 5 or an old 1.1 usb connector it wont work.
Alot of those hongkong micro a to b converters are rubbish.
The nokia has been reported to work.
You need a USB "HOST" Cable, it contains a chip that puts your devices on "master" mode.
The Nokia and Archos one work, for the others don't expect them to work at all if they do not mention to be USB "HOST" cables !
BTW, the feedback is not very good, seems that it can deliver only 200mA, so if you want to plug an external disk drive, make sure you have a power supply on it before
Also some USB keys need more than 200mA so they won't mount at all :/
I found this: http://www.kjell.com/content/templa...9&path=97000000,119000000,149500000,151500000
Translation: Used by for example mobile phones with USB host (it's own built in USB controller).
Is the USB "HOST" Cable the same as this? http://en.wikipedia.org/wiki/USB_On-The-Go
foh1981 said:
I found this: http://www.kjell.com/content/templa...9&path=97000000,119000000,149500000,151500000
Click to expand...
Click to collapse
That cable doesn't look correct.
[correction - that cable at kjell looks correct for hooking two USB On-The-Go devices together. So if you wanted to hook your Archos to another Archos or to a blackberry.]
Look for a micro usb Nokia n810 host cable. Or "Micro USB Host OTG". They seem widely available in the us on eBay
Usually they have the micro USB male connector and a full size female connector on the other. Be careful because some are mini USB, you want micro USB
Look on the us eBay for a picture.
Here is a pretty good picture also - http://www.dealextreme.com/details.dx/sku.51045 several people have confirmed this one works.
Yeah, the connector is obviously wrong on that one. I was mostly curios about whether this USB HOST cable was the same as an OTG.
That's the only cable of OTG type that I've seen in any retail store in Sweden (although I haven't been looking for it until now), so I was thinking of maybe getting it in the store and then get an adapter for the connector. But since there's a special pinning on these cables (as I understand from the Wikipedia article) maybe that doesn't work?
I'll probably go for the Nokia cable anyway, just to be sure, should be able to find it in a retail store somewhere...
fzelle said:
Alot of those hongkong micro a to b converters are rubbish.
The nokia has been reported to work.
Click to expand...
Click to collapse
the nokia one doesn't work for me
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250770684805#ht_3877wt_798
by Seller info
business2828 ( 5107)
$5 now, I paid $8 (figures)
this works fine on my 32IT. I can use my microSD adapter, camera, powered hard drive, multi-card reader with SD cards and USB mouse. Other people have said they can't get USB host to work at all, even with this cable, but it works for me.
USB mouse works ok.
But it`s not enought power for 3G USB dongles.... Печалька.
Nokia ones works ok
http://www.dealextreme.com/p/genuine-nokia-ca-157-micro-usb-otg-to-usb-data-cable-14cm-length-51045
Seems to be a perfect fit for the ASUS 40 pin connector.
Now we have to decide WHAT to make. I was thinking about a few items, but your suggestions needed.
Wheeeeeeee....
Note: There may be other places to get it, but this is the first place I found it.
Mouser Part #: 571-2129276-1
Manufacturer Part #:
2129276-1
Manufacturer:
TE Connectivity
Description: I/O Connectors 40P CABLE MNT PLUG CHAMP DOCKING
Stock: 1,070 Can Ship Immediately
Pricing (USD)
1: $3.49
10: $3.14
25: $2.85
100: $2.71
PS: These are very small connection points, so you need to have special soldering equipment (sub-mm tips).
Well, maybe start with USB Host?
My suggestions:
- USB-Hub like Soundsurfer said
- Infrared adapter to control your home cinema (i saw that the new sony tablet s has it built in. maye we can port the software?)
- DVB-t
greetings
SoundSurfer said:
Well, maybe start with USB Host?
Click to expand...
Click to collapse
Great idea. I like it a lot.
I ordered a couple of these ACT4060 items:
ACT4060A SOP-8 ACT4060 Wide Input 2A Step Down
The idea is to take 15V from the tablet or charger and step down to 5V to power a USB hub, similar the the ASUS USB host device (same part).
I also thought to add a 5.5mm female barrel socket for charging with a 15V power supply, like these: Power Supply DC 15V
Note: Many other power supply are available from 12V-15V with 5.5mm barrel plug.
---------- Post added at 03:26 PM ---------- Previous post was at 03:22 PM ----------
w04g005 said:
My suggestions:
- USB-Hub like Soundsurfer said
- Infrared adapter to control your home cinema (i saw that the new sony tablet s has it built in. maye we can port the software?)
- DVB-t
greetings
Click to expand...
Click to collapse
Great, thanks!
I do not think the HDMI output is on the 40 pin cable, but I could be wrong. There is audio available, because it is on the TF101 Desktop Stand.
Any links to an infrared control?
Bob Smith42 said:
Any links to an infrared control?
Click to expand...
Click to collapse
Sorry,
i have no link for infrared control. I only have seen the video with infrared remote from the tablet s
http://www.youtube.com/watch?v=tbYzckPXJ2Q&feature=player_embedded
But we can try to combine a standard usb infrared adapter with the 40-pin connector. Maybe it doesn't work because of the lack of drivers (if they couldn't get extracted from the sony tablet). But i have to say that i'm neither a electronic technician nor a programmer. Only wanted to suggest my wishes ;-)
Maybe this can help:
http://www.irdroid.com/
greetings
Can you make a regular USB cable with this connector ?
question: do you have the pin out of the 40-pin connector?
w04g005 said:
- Infrared adapter to control your home cinema (i saw that the new sony tablet s has it built in. maye we can port the software?)
Click to expand...
Click to collapse
This would be a great idea - this sort of feature makes the Sony offering stand out in an otherwise fairly homogenous tablet market. Don't know anything about how to do this though, but will post back if I manage to find out anything useful...
fisha21 said:
This would be a great idea - this sort of feature makes the Sony offering stand out in an otherwise fairly homogenous tablet market. Don't know anything about how to do this though, but will post back if I manage to find out anything useful...
Click to expand...
Click to collapse
Ok, i assume 2 or 3 pins on the 40-pin connector are for audio signals because the dock has an audio out! we could connect some irda leds to the pins like shown in this project:
www.irdroid.com
But i have to say that i read today about a new logitech product called: logitech harmony link
www.logitech.com/en-us/remotes/universal-remotes/devices/harmony-link
i think i will buy these to replace my harmony one.
greetings
Matthias
how about a mini usb cord? So I could plug my DSLR camera into it and download the pictures on the fly?..or even a micro to plug the phone in...but if it was a USB hub, it would work as well..just a longer cord.
w04g005 said:
Ok, i assume 2 or 3 pins on the 40-pin connector are for audio signals because the dock has an audio out! we could connect some irda leds to the pins like shown in this project:
www.irdroid.com
Click to expand...
Click to collapse
Quick look on Google shows up this serial IR transceiver made by IguanaWorks. I'm afraid my electronics knowledge is very limited, but could the serial connector be replaced by these Asus-compatible adapters. I suspect the main problem might be the way the transceiver draws charge from the serial port to charge up the capacitor? According to the website, it uses LIRC so either the Irdroid or Androlirc apps might work (Androlirc requires an audio-IR device, so may need some tweaking, but is apparently open-source).
The other option might be the Newkinetix Re - whether it would be possible to replace the iThing connector with the ones you have located. Of course, the app is only for iOS, so yet another stumbling block.
I'm only feeding back the results of my digging, lack any of the required skills to make any of this work, so forgive if it all misses the mark completely.
w04g005 said:
But i have to say that i read today about a new logitech product called: logitech harmony link
www.logitech.com/en-us/remotes/universal-remotes/devices/harmony-link
Click to expand...
Click to collapse
Of course, this does also look pretty good, if you don't mind the IR extender "spiders" ... and the fact that the TV guide feature is only available for iPad (grr!)
I thought this thread would be more popular. If the plug didn't cost so much to ship to my country I'd be building a wall charger with a long lead and a car charger.
Sent from my u8800 using XDA App
That's a nice find! Now if only we knew some technical details about the connector pin-out.. I guess a good start would be looking at what both docks have inside and the connector routings, I doubt they use any external electronics, so should be quite easy to do cool things.
EDIT: at least now we'll be able to do another cable.. buy a standard USB 3.0, cut one end out and solder the new connector. A bit of cleaning everything up and ready to go.
PatrickVogeli said:
That's a nice find! Now if only we knew some technical details about the connector pin-out.. I guess a good start would be looking at what both docks have inside and the connector routings, I doubt they use any external electronics, so should be quite easy to do cool things.
EDIT: at least now we'll be able to do another cable.. buy a standard USB 3.0, cut one end out and solder the new connector. A bit of cleaning everything up and ready to go.
Click to expand...
Click to collapse
I finally got my USB Host Kit for the TF, so I can work on the connector pin out. The USB Kit did not work (for me) on the dock 40 pin socket, so apparently there are differences between the Dock and Tablet 40 pin sockets.
Can anyone can confirm the USB Kit does/does not work on the dock 40 pin socket?
Thanks
fisha21 said:
Quick look on Google shows up this serial IR transceiver made by IguanaWorks. I'm afraid my electronics knowledge is very limited, but could the serial connector be replaced by these Asus-compatible adapters. I suspect the main problem might be the way the transceiver draws charge from the serial port to charge up the capacitor? According to the website, it uses LIRC so either the Irdroid or Androlirc apps might work (Androlirc requires an audio-IR device, so may need some tweaking, but is apparently open-source).
The other option might be the Newkinetix Re - whether it would be possible to replace the iThing connector with the ones you have located. Of course, the app is only for iOS, so yet another stumbling block.
I'm only feeding back the results of my digging, lack any of the required skills to make any of this work, so forgive if it all misses the mark completely.
Of course, this does also look pretty good, if you don't mind the IR extender "spiders" ... and the fact that the TV guide feature is only available for iPad (grr!)
Click to expand...
Click to collapse
Seems many people like infra-red controls. Here is some pics of the I-Got-Control device for the iPod/iPad/iPhone.
There seems to be only a few lines connected to the Apple 30 pin connector. Does anyone have the pin-out for Apple 30 pin connectors?
I think this might be easily attached to the Asus USB Host or SD adapter.
Thanks!
a backpack style add-on for the TF would be neat...something that adds a battery/usb/etc at the cost of making it a bit fatter and maybe taller..
Sent from my Transformer TF101 using xda premium
Any updates on this?
Amazed at how hard it is to find a 30-pin connector pinout, seems Apple tweaked it a bit as new generations came along.
This is the kind of thread I love to see, on Android+TF!
Sent from my Nexus S using Tapatalk
If I were to solder every connector point through a wire, would connecting the dock from the side through the 40 pin connector to the bottom slot of the TF give the same communication as if the TF is docked? Been wanting to "dock" the tablet without actually having them together.
Yeah, it would work, but instead of soldering better find connectors and a cable. I'm thinking of doing it to my USB adaptor (which is very badly done, completely loose).
Bob Smith42 said:
Does anyone have the pin-out for Apple 30 pin connectors?
Click to expand...
Click to collapse
Isn't that available all over the net?
pinouts.ru /PortableDevices/ipod_pinout.shtml
Cheers!
-M
Xda member since 2007
I made a USB dongle that plugs into the USB port on the touchpad and provides a powered female USB-A port. It is basically a portable USB charger/battery with an OTG cable soldered to the USB port. Attached is a quick pdf showing the process. It's much smaller and more portable than using a y-cable and powered hub or battery pack.
The charger is $13 on Amazon with free prime shipping and OTG cables around $2 on ebay.
It's nice because it's small and I can secure it to the my case with a rubber band, providing a quick connection to a keyboard/mouse or usb flash drive. The particular charger charges via any powered USB port with a provided cable.
This is the battery pack I ordered, note the picture on the amazon page is not 100% accurate:
http://www.amazon.com/T-Mobile-Port..._1_1?s=wireless&ie=UTF8&qid=1325984238&sr=1-1
This is the cable I purchased, there are cheaper ones, but they ship from China:
http://www.ebay.com/itm/Micro-USB-O...ccessories&hash=item1e69fbb3c5#ht_1336wt_1398
Would that be powerful enough to power external portable hard drive like WD Passport?
gedas5 said:
Would that be powerful enough to power external portable hard drive like WD Passport?
Click to expand...
Click to collapse
Unfortunately, I don't have the power specs on the battery pack. If I come across a USB-powered hard drive, I'll test it.
scarletwahoo said:
I made a USB dongle that plugs into the USB port on the touchpad and provides a powered female USB-A port. It is basically a portable USB charger/battery with an OTG cable soldered to the USB port. Attached is a quick pdf showing the process. It's much smaller and more portable than using a y-cable and powered hub or battery pack.
The charger is $13 on Amazon with free prime shipping and OTG cables around $2 on ebay.
It's nice because it's small and I can secure it to the my case with a rubber band, providing a quick connection to a keyboard/mouse or usb flash drive. The particular charger charges via any powered USB port with a provided cable.
This is the battery pack I ordered, note the picture on the amazon page is not 100% accurate:
http://www.amazon.com/T-Mobile-Port..._1_1?s=wireless&ie=UTF8&qid=1325984238&sr=1-1
This is the cable I purchased, there are cheaper ones, but they ship from China:
http://www.ebay.com/itm/Micro-USB-O...ccessories&hash=item1e69fbb3c5#ht_1336wt_1398
Click to expand...
Click to collapse
that looks nice.. but you re saying that its plug and play?..
you dont have to mount/unmount?
why didnt you get one w/ more usb ports?
your pics are clear.
i wonder how easy it is to do the battery hub like yours but w/ 4 usb ports
Nicely done, very good solution and tutorial. again excellent!!!!
amkaos said:
that looks nice.. but you re saying that its plug and play?..
you dont have to mount/unmount?
why didnt you get one w/ more usb ports?
your pics are clear.
i wonder how easy it is to do the battery hub like yours but w/ 4 usb ports
Click to expand...
Click to collapse
http://www.amazon.com/Solar-Powered-Battery-Charger-Adapter/dp/B006DVMW92
This hub has 4 ports, a battery plus solar charging. That said, if I buy it I'll probably just plug it directly into the OTG cable rather than solder them together. Then again my soldering can be a little rough.
- Sent from a Prime terminal using a friends account
So can we only use the Micro Usb OTG host to connect to a USB drive/keyboard?
tpcm said:
So can we only use the Micro Usb OTG host to connect to a USB drive/keyboard?
Click to expand...
Click to collapse
yes plus 10char
Deserves sticky, love mods like this even if not always practical.
Cant believe they didnt give the touchpad a powered usb host. I guess they figured people would have issues with not enough power or drain the battery too quick with it.
So I think when I have some spare time I may mod your mod and show how to make a powered usb host that plugs into the wall charger so when your "docking" somewhere to charge you can hook up a keyboard and use it without restriction and even be charging the touchpad at the same time.
Probably don't even need to be too creative a proper Y cable may do the trick out the gate. Just to track one down.
Probably a stupid question, but it wouldn't be my first one...
Could you simply use a USB male-to-male cable to go between the battery pack and the OTG cable? Eliminate the soldering that way?
Or am I missing something?
I found a cable that I think will work perfectly for my idea of doing this from the charger instead of from battery: http://www.dealextreme.com/p/usb-fe...gb-tf-card-card-reader-kit-for-xtc-clip-82289
You can do it much cheaper with adapters and a regular y adapter though, and you may want to do so, so that you can have a longer cable from the charger to the y split, but yeah I will try this out sometime soon and let you know how it works.
The charger probably gives enough power to easily run things like a external HDD and such while the battery pack may not.
@Vicious ... couldn't that possibly put too much power to a USB device? Just saying since it is probably meant to be hooked up to a regular USB 5v port and (I don't know the specifics but) the touchpad USB power adapter has a high AMP output (might be talking sht here).
Nothing to worry about a device only "pulls" the amperage it needs so you can have extra with no harm to the device. It is the voltage that needs to match and usb is standard 5v.
Having too little amperage can actually cause a device harm due to malfunction, like a head crashing on a 2.5" hdd during use or a thumb drive failing to flash properly corrupting a sector.
I feel anybody that uses the touchpad in a docked setting that wants to use a keyboard may very well make use of my idea, that I of course got from the OP's idea.
I'll part it out for the cheapest way to make it without any cutting/soldering and test it soon enough.
mountaindewmi said:
@Vicious ... couldn't that possibly put too much power to a USB device? Just saying since it is probably meant to be hooked up to a regular USB 5v port and (I don't know the specifics but) the touchpad USB power adapter has a high AMP output (might be talking sht here).
Click to expand...
Click to collapse
That cable will work fine. I wasn't doing anything special, only eliminating the y-cable. I mainly wanted a small form factor way of adding a USB port to my case for portability. Now I can put a movie on a usb drive and watch it on the go.
You generally don't have to worry about using a supply that is to powerful. As long as the voltage output is 5 V, the device will only draw a certain current and consume the corresponding amount of power. The rating on a constant voltage supply is simply the maximum current it can provide, the amount it provides depends on the properties of the device.
Say you have a device, it states it operates at 5 V and draws 100 mA of current. That means the impedance of the device is R = V / I = 50 ohms. So if you use a 5 V supply rated to at least 100 mA, the device will only draw 100 mA. The supply can be rated for 100 mA or 1000 amps, it does not matter. (Although you wouldn't want to use 1000 A source as if something breaks or shorts it can draw a higher current)
Wikipedia "ohms law" if you are not familiar.
I tried to do this but can't get it to work, the touchpad shows the charging battery icon only it's not charging, and running dmesg it say source=charger mA=100 and usb otg exited low power mode and then right after says it entered low power mode... Not sure what the issue is...
edit: I'm thinking it may be my soldering work, gonna give it another pass...
joenathane said:
I tried to do this but can't get it to work, the touchpad shows the charging battery icon only it's not charging, and running dmesg it say source=charger mA=100 and usb otg exited low power mode and then right after says it entered low power mode... Not sure what the issue is...
edit: I'm thinking it may be my soldering work, gonna give it another pass...
Click to expand...
Click to collapse
You may have the two data pins shorted together. To the best of my knowledge, this tells the touchpad to go into charging mode. The touchpad charger does this, because in order to charge, it must draw more power than USB ports are designed to provide.
You need to remove the two resistors circled in the PDF. These keep the data pins shorted together as well.
This is a really great idea I think I might try it and your tut is very well explained thanks for taking the time out to put it all together
Thanks
Mouse works fine, keyboard hasn't been tried yet. How do you access a flash drive through this? What are the steps?
If you just cut out the resistors in the battery hub, could you just use the TP's regular cable to plug into one of the ports on the hub?
tpcm said:
Mouse works fine, keyboard hasn't been tried yet. How do you access a flash drive through this? What are the steps?
Click to expand...
Click to collapse
Stick mount works great
Sent from my CM9 TouchPad
Some kernels for the Evo 3D on XDA now have On-The-Go (OTG) USB host support built-in so it's very easy to support USB peripherals such as keyboards, mice, flash drives and portable hard drives from your phone regardless of the ROM installed. If you would like more information about OTG, here's a very good thread in the XDA Sensation forum that covers it pretty well.
The commands to mount and unmount USB storage devices manually are covered in that thread, but I've found the easiest way to mount and dismount my flash drive is to use an app called [root]StickMount from Chainfire, the developer of SuperSU. Depending on the ROM installed, it may not be considered compatible and won't show in the Play Store, so I've attached the .apk in case that happens.
I haven't used devices other than flash drives so far on my phone, but other users have indicated that keyboards, mice and other USB devices also work. If you are using OTG to attach any type of USB devices, please share your experiences and any tips you might have. Also, please use this thread for any questions you might have about OTG support and devices, even if you haven't gotten around to trying it yourself yet.
Other XDA threads about OTG related stuff:
Solar powered USB hub (kinda cool)
usb otg cradle
Nitty gritty OTG hardware discussion
Post with diagram of OTG connections
Thanks to mpgrimm2 for suggesting that we share this information from another site (there's actually more over there ).
ramjet73
I want to thank Markmx6 for his guide on another site that was easy for me to follow to make my own OTG cable and Ramjet73 for digging up and posting his links here. Maybe Markmx6 will add his info over here now too since all this works with the Buttered Toast Kernel (bigwillyg).
I got to looking around and wondering with the parts I have if I am setup for OTG and just need to plug everything together without hacking up a power supply which I'd prefer not to do.
Here's what I have on hand:
I ohmed out the " CrazyOnDigital 2 port charger's" data pins:
Port1-pin3 & port2-pin3 = 0.1 ohms (and about 30k to gnd/shld)
Port1-pin2 & port2-pin2 = 0.1 ohms (and about 30k to gnd/shld)
(I also reversed the leads in case I was reading through a diode)
So it looks like the data pins on this aren't shorted together and that it will function as a Powered USB "y" cable/pass through between ports 1 & 2.
Part 2
I realize that my purchased USB OTG cable won't plug in between the charger & my phone so I may use a USB extension Cable and USB A to A adapter that I have (not pictured) or I may just hack a spare USB A to Micro USB (5pin) cable that I have into another OTG Cable.
Q: My understanding is that an OTG cable has the ID pin (pin 4 of the 5pin Micro) tied to Gnd, like Markmx6 did in his original cable; correct? So, that's why the micro USB end gets cut open a bit.
A: Yes.
----------------------------------------------------------------
My Additional References:
Zoom [DIY] MicroUSB Host Cable
So in a normal micro/mini USB cable, there are 4 wires, 5 pins.
1. Red - V+
2. White - Data -
3. Green - Data +
4. Empty
5. Black - Ground
That micro male to mini female cable above has the 4th (5th?) wire, brown. This is the ID wire. Shorted to ground, it makes the cable a host cable.
Click to expand...
Click to collapse
Wikipedia's: USB On-The-Go page
The OTG cable has a micro-A plug on one side, and a micro-B plug on the other (it cannot have two plugs of the same type). OTG adds a fifth pin to the standard USB connector, called the ID-pin; the micro-A plug has the ID pin grounded, while the ID in the micro-B plug is floating. The device that has a micro-A plugged in becomes an OTG A-device, and the one that has micro-B plugged becomes a B-device. The type of the plug inserted is detected by the state of the pin ID .
Three additional ID pin states are defined[4] at the nominal resistance values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin. These permit the device to work with a USB Accessory Charger Adapter which allows the OTG device to be attached to both a charger and another device simultaneously.[6]
These three states are used in the cases of:
- A charger and either no device or an A-device that is not asserting VBUS (not providing power) are attached. The OTG device is allowed to charge and initiate SRP but not connect.[6]
- A charger and an A-device that is asserting VBUS (is providing power) are attached. The OTG device is allowed to charge and connect but not initiate SRP.[6]
- A charger and a B-device are attached. The OTG device is allowed to charge and enter host mode.[6]
Click to expand...
Click to collapse
Micro-USB connector pinout
-----------------------------------------------------
Part3: SUCCESS! (with Otg Enabled kernel)
I went ahead and modified a spare USB A to Micro B cable for OTG without power. Plugged everything up with my Logitech Wireless USB mouse and it works! Cool as can be! See new pics. (Yellow wire is the Jumper).
Still have a few questions:
Q: Would the "purchased" OTG Cable already have pin 4 & 5 Shorted?
A: YES it should, but one of the cables I bought was defective.
Q: Does your OTG setup from the op charge the phone at the same time (and/or keep it charged)?
A: Yes
Edit: Apparently I broke the +5v wire during reassembling the cable. See next post.
(SEE UPDATED POSTS FARTHER DOWN)
EDIT:
In Relation to my Following Posts, I have patched together the following cable schematics as a reference to the cables I have either made or purchased.
If you have the ability & willingness to find out what the ID pin resistance is in your "Accessory" device as mentioned below please let me know. I am trying to correlate the info from the Wikipedia/USB OTG reference to all the available ID pin states.
Mpgrimm2; I have a small update from some of my testing regarding the USB OTG 4 ID pin states (pin 4 to pin 5 "gnd" ).
Ininity (Open) = Standard USB data/charge
0 Ω (shorted) = USB OTG host
36.5K Ω = desktop cradle/dock
(my seidio actually has a 47k Ω resistor said:
Anyone want to open their car dock and check the resistor?
Anyone want to open their MHL adapter & check the resistor on that too?[/COLOR]
Wikipedia's: USB On-The-Go page
Click to expand...
Click to collapse
Here's what I've found out or verified:
- I'm still not sure about the 3 different USB OTG ID modes that were mentioned. In the test rig (pictured) for different values of resistance between pin 4 (ID) and pin 5 (gnd):
0 ohm (Short) = USB OTG host
36.5k ohm (47k in use) = Dock Mode
68K ohm (74k in use) = Dock Mode
124k Ohm (127k in use) = No discernible effect
I also determined that my first homemade USB OTG cable wouldn't allow the phone to charge because of a broken +5v wire during reassembly (new one works correctly, but so far I preferred the simplicity of the original setup & charger over the new cable I made, but time will tell.
Here's the Ebay link to the OTG cable RamJet73 recommended (same as the last one I made b/c I didn't want to wait) so that I can keep it linked in one place.
Here are the pictures of the 2nd cable that I made that is "very similar" to the one Ramjet73 mentioned at eBay but 2ft longer (See Schematic #4 in later post).
Keep in mind that the OTG function will be disabled if an OTG cable is plugged into a USB charger that has the data pins shorted internally (AC charging), but this doesn't appear to happen with a powered hub (isolated)
Markmx6's "Homemade Powered OTG Cable" Part 1
I got permission from Markmx6 to repost this here:
Markmx6; said:
First off, I am not responsible for you screwing up your phone, shorting your house out, frying your SD card, burning down your home, or anything else that may or may not occur from you building this...
Tools you will need: Razor blade, Soldering iron, Solder, Super glue.
Optional tools: Dremel with cut-off wheel.
I started with components I imagine you will all have, since they came with the phone. The HTC charging cable and outlet adapter.
First, cut around the base of the outlet adapter. This is around 3/16" thick, and the cut is better off to be made on the "shiny" plastic than the "dull" portion. I used a Dremel, but any type of blade will do, it just may take more time.
Make a cut along the white line on the board (Shown in red here) Otherwise this will not work. On typical chargers they short out the Data+ and the Data- connections (mpg2 edit: it forces "AC Charging" mode). Not sure why... Digging a razor blade across this several times should do the trick, but if you want to make sure with a continuity tester that will always give piece of mind.
Now you need to cut your cable, I recommend leaving around 2" or more from the standard usb side. (A little of this wire will come in handy for later in this project)
Cut and then strip your wires, there will be a braided shielding wire just under the insulation. Then it will be helpful to "Tin" the ends of your wires.
The shielding can be completely removed, or you can ground it out, but I haven't found this to be needed.
You will now need to solder the wires to the circuit board. This will obviously need to be in the correct order.
From the top will be:
RED = 5V+
WHITE = Data +
GREEN = Data -
BLACK = 5V-
Now you can re-assemble the Outlet adapter if you choose.
Now you need to cut up the other (phone) end of your cable to enable the OTG function.
Post 2 will outline this.
Click to expand...
Click to collapse
Markmx6's "Homemade Powered OTG Cable" Part 2
Markmx6; said:
Carefully cut down the sides of the connector, if you can do this in one clean cut it will be helpful when you re-attach then after your modifications.
Carefully cut away the plastic, and what looks like hot glue. You need to expose the side that has a blank terminal. and the one on the other side that has a black wire.
Pins 4 and 5 need to be attached, so a small piece of wire (from the leftover ends of the cable comes in handy) works really well.
It doesn't really show up in the pictures though
Now re-glue the pieces from the end of the cable back onto the connector
That is all.
I am using 3.2.8otg for a kernel and negalite2.9 and otg helper and everything works as it should.
http://forum.xda-developers.com/showthread.php?t=1588979
For usb storage you need to have all of the cables hooked up before you insert the SD card.
Click to expand...
Click to collapse
NOTE: Bigwillig's [Kernel] ButteredToasT ICS RLS 04 | Linux 3.0.46 | linaro 4.7 -o3 | otg | HTC beats also supports OTG with any rom that will boot the kernel.
Sent from my "Up all night, Sleep all day" EVO3D!
Ebay/Applecable Purchased OTG Cable & USB Hub
I just verified that if you get the Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay) that Ramjet73 mentioned (or this one), it will work with any standard USB charger (ie the 1 Amp HTC or 2 Amp HP Touchpad Charger) because the USB Power Connector is Isolated. I also picked up Applecable's USB 2.0 3 Port Hub with data Sync Charger cable for $7
(I may try to modify it to be a USB OTG powered hub with this OTG Adapter and this USB to 3.5mm/1.3mm Adapter to power the hub directly from "ANY" USB charger.
EDIT: It works fine, but modified it anyway).
Here's some updated AppleCable Ebay Store links (4-18-14):
Micro USB Host OTG Cable With USB power
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
^^^
been looking for something like this!! post back on your progress
mpgrimm2 said:
I just verified that if you get the Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay) that Ramjet73 mentioned (or this one), it will work with any standard USB charger (ie the 1 Amp HTC or 2 Amp HP Touchpad Charger) because the USB Power Connector is Isolated. I also picked up Applecable's USB 2.0 3 Port Hub with data Sync Charger cable for $7 (I may try to modify it to be a USB OTG powered hub with this).
Click to expand...
Click to collapse
I just found out that the version of the OTG cable with the female microUSB connector doesn't charge the phone when power is applied to that connector. The eBay listing at your link above doesn't say one way or the other, but this link was posted on another site and that listing specifically says it doesn't. I'm not sure why that is, but it looks like the same brand (Chen Yang) in both listings.
The version with the male USB A connector for power can definitely charge the phone when in use. I've tested that myself.
ramjet73
Now that I've made a few on my own and bought the one you recommended, I can say it likely has to do with the way that it's wired up. I would bet that the Applecable one with the M & F microUSB allows charging.
Note: I also updated my previous post with a new USB to 3.5mm adapter for the hub. I ordered both adapters (so I don't have to cut/solder mods to the hub) and will report back once I get it. (also picked up a 2nd 3d for my son's b-day coming up so I don't waste an upgrade just yet).
Edited
I just don't get it... Found many usb hubs with internal rechargeable batteries, but all are old posts, not available for sell anymore . Why is it so complicated for Evo 3D to connect usb to it? I really want to connect my Razer Banshees to it, but all this running around to find a usb hub with internal battery is killing me, and having one that works on charger is ilogical, from my point of view. If i want to do this, I want it to be portable, otherwise I'd just connect it to my pc/laptop. I connected them to a Galaxy S3 and they worked instantly. I use Coolexe's ROM and Kernel (v4.0), and it says that it has usb support and usb headset support
posedatull said:
I just don't get it... Found many usb hubs with internal rechargeable batteries, but all are old posts, not available for sell anymore . Why is it so complicated for Evo 3D to connect usb to it? I really want to connect my Razer Banshees to it, but all this running around to find a usb hub with internal battery is killing me, and having one that works on charger is ilogical, from my point of view. If i want to do this, I want it to be portable, otherwise I'd just connect it to my pc/laptop. I connected them to a Galaxy S3 and they worked instantly. I use Coolexe's ROM and Kernel (v4.0), and it says that it has usb support and usb headset support
Click to expand...
Click to collapse
Unlike Samsung, HTC hasn't officially supported OTG so we are lucky to have some ROM's and kernels that do support it. Even the utilities like stickmount don't download from the Play Store because the Evo 3D is not considered a compatible device.
USB mice and keyboards can work without external power, but many other devices need power and would drain the phone battery very quickly even if they could use it. I have no experience with USB headphones on a phone, but it would make more sense to me to have batteries in the headphones and not depend on the phone for power. Another possibilty may be to use an external battery like this one connected to an OTG adapter that includes a connector for external power, but I haven't test that.
I use rechargeable stereo bluetooth headphones so I don't have to mess with cables at all, but if you prefer the USB headphones the options may be more limited with the Evo 3D than the SGS3.
ramjet73
Between the items Ramjet73 and I have mentioned in previous posts (edited below), you should be able to piece together the functionality you are looking for, but still not ideal as far as portability. Markmx6 has mentioned making his own "D" battery powered usb hub (I think) that he may post here sometime. Hope this helps.
mpgrimm2 said:
I also picked up
this USB 2.0 3 Port Hub with data Sync Charger cable for $7
this OTG Adapter
this USB to 3.5mm/1.3mm Adapter to power the hub directly from a USB port/charger).
Click to expand...
Click to collapse
ramjet73 said:
Another possibilty may be to use an external battery
like Rechargeable USB Universal Battery connected to an OTG adapter that includes a connector for external power, but I haven't tested that.
Click to expand...
Click to collapse
Good find Ramjet73! Got me thinking about options again, just waiting on my parts to get here. Mind if I paste this into the other sites thread?
Saw this app posted in the Buttered Toast thread and may give it a try for NTFS support:
mnomaanw said:
You can mount NTFS drives with this App ----> https://play.google.com/store/apps/details?id=com.paragon.mounter&hl=en
I think it can mount exFAT also.
Click to expand...
Click to collapse
posedatull said:
I just don't get it... Found many usb hubs with internal rechargeable batteries, but all are old posts, not available for sell anymore . Why is it so complicated for Evo 3D to connect usb to it? I really want to connect my Razer Banshees to it, but all this running around to find a usb hub with internal battery is killing me, and having one that works on charger is ilogical, from my point of view. If i want to do this, I want it to be portable, otherwise I'd just connect it to my pc/laptop. I connected them to a Galaxy S3 and they worked instantly. I use Coolexe's ROM and Kernel (v4.0), and it says that it has usb support and usb headset support
Click to expand...
Click to collapse
I built a 4 port charger using four "D" batteries for a trip I took to Disney world (five kids on a six hour flight.... required someway to recharge Nooks, cell phones, and etc)
To break it down simply I used a four battery holder. (Apparently I don't have enough posts to post links, pull up radioshacks website and search for "D" battery holder)
You don't need "D" batteries as these are bulky, I used them because size wasn't really a factor. "AA" or "AAA" batteries should be fine. Remember Alkaline batteries provide 1.5 volts each NiCad (Older rechargeable) 1.2 volts There are newer voltages to my knowledge...
I used four batteries because it produces 6 volts in series. MAY POSSIBLY DAMAGE YOUR PHONE
Ideally you would provide 5 volts which is what USB provides, I find 6 volts worked fine for me.
For my charger I shorted the DATA +/- terminals together to fool the phone into believing it was using AC power for a faster charge.
All you really need to do to continue to use the hub as a Data transfer device would be to solder the red and black wires to their respective terminals on the hub, it shouldn't matter which port you use as they should all be linked, other hubs may vary.
You may also be able to just wire a female USB port onto the battery holder and use a hub plugged into that...
My CrazyOnDigital 2 port charger doesn't have the data pins shorted (D+ and D-) like the stock HTC unit. This causes any "Android" phone to charge at the lower 500ma Max "Charging USB" rate vs "AC Charging" (explains my slow charging when travelling), but a bonus is that it allows me to pass data b/w the 2 ports like a simple hub.
- If the D+ and D- pins are shorted when an OTG USB cable is plugged in, the phone will go into "AC Charging" mode, but not allow OTG devices to work, but if the phone is still connected and the data pins opened back up, you retain "AC Charging" mode and have USB OTG functions.
(I'm thinking that a simple on/off switch installed across the data pins of my charger will give me a dual mode charger).
---------------------------------------------------------
AC CHARGING / USB CHARGING (Data Pass Through) MOD 12-1-12
- I got tired of having a 2 port 2 Amp charger that only allowed 500ma "USB Charging" with Android & OTG. See pix:
mpgrimm2 said:
I just verified that if you get the Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay) that Ramjet73 mentioned (or this one), it will work with any standard USB charger (ie the 1 Amp HTC or 2 Amp HP Touchpad Charger) because the USB Power Connector is Isolated. I also picked up Applecable's USB 2.0 3 Port Hub with data Sync Charger cable for $7
(I may try to modify it to be a USB OTG powered hub with this OTG Adapter and this USB to 3.5mm/1.3mm Adapter to power the hub directly from "ANY" USB charger).
Click to expand...
Click to collapse
And here is my new OTG setup with the modified charger (no need to modify the charger with this) and modified hub:
Also works well with [MOD] Self Powered USB OTG on the HP Touchpad! (v2 Full Size) 11-30-12
Just out of curiousity, will a sixaxis controller be supported by otg? Could anybody confirm this for me.
Jsparta26 said:
Just out of curiousity, will a sixaxis controller be supported by otg? Could anybody confirm this for me.
Click to expand...
Click to collapse
I saw someone taking about it in the HP Touchpad CM9 thread, I will see if I can find the post & report back.
update: post was here
-------------------------------------------
Separately, I saw this (couldn't find the u12000 solar hub mentioned previously)
Opteka BP-SC4000 Ultra Thin Solar Powered High Capacity (4000mAh) Backup Battery and Charger
I know some have mentioned an interest in an all in one OTG enabled solar powered charger with battery backup. Sounds easy enough with the correct parts.
Sent from my "Up all night, sleep all day" HP CM9 Touchpad
[INFO] HP TP USB OTG Notes, Tips, & Tricks
DISCLAIMER: I'm not a dev, nor do I play one on t.v. Use the information and links at your own risk. READ and UNDERSTAND what your doing before flashing is the best bet. I take no responsibility or credit for the information.
This is a work in progress... Still gathering my notes for the thread.
Major Credit to @ramjet73 for working with me on the Evo3d OTG Tips & Tricks thread and allowing me to reuse the info here:
-----------------------------------------------------------------------------------------------------------------------------------
Other XDA USB OTG related threads:
Spunker88's HP Touchpad USB OTG Compatibility List
Solar powered USB hub (kinda cool)
Nitty gritty OTG hardware discussion
Mpgrimm2's [MOD] Self Powered USB OTG on the HP Touchpad! (v2 Full Size)
ramjet73 said:
For kernels that have On-The-Go (OTG) USB host support built-in, it's very easy to support USB peripherals such as keyboards, mice, flash drives and portable hard drives from your phone regardless of the ROM installed. If you would like more information about OTG, here's a very good thread in the XDA Sensation forum that covers it pretty well.
The commands to mount and unmount USB storage devices manually are covered in that thread, but I've found the easiest way to mount and dismount my flash drive is to use an app called [root]StickMount from Chainfire, the developer of SuperSU. Depending on the ROM installed, it may not be considered compatible and won't show in the Play Store, let me know if that happens and I will post the apk.
If you are using OTG to attach any type of USB devices, please share your experiences and any tips you might have. Also, please use this thread for any questions you might have about OTG support and devices, even if you haven't gotten around to trying it yourself yet.
Click to expand...
Click to collapse
A couple of quick FYI's about using USB OTG with the Touchpad:
- USB OTG has been possible on the HP TP since CM9 (or earlier?)
- To enable OTG on any android device, Pin 4 (I.D. Pin) needs to be shorted to Pin 5 (DC Return) on the host device. This is the function of "OTG" cables. Note that I have purchased OTG cables that didn't work because Pins 4 & 5 were not shorted/manufactured correctly. On some devices with 3.x Kernels, it is possible to enable USB OTG via a sysfs command (not the TP yet).
- The HP Touchpad is not capable of supplying 5v power out the microUSB port for OTG functions so a standard OTG cable WILL NOT WORK. You must use either an OTG Cable with Isolated External Power Plug, an externally powered USB Hub, or a modified USB Charger/Cable.
- Even though external power is required for OTG, earlier support for USB OTG on the TP would only allow a device that draws/reports 100ma or less (ie USB mouse, small thumbdrives, etc) to be active when directly attached to the primary msm_otg port of the TP (Not Sure if this still applies). This limit can be "bypassed" for larger draw devices (ie portable hard drives) by using an externally powered USB Hub in between the TP's OTG Cable and the device. The hub's "Host" end will report 100ma or less to the TP and allow up to 480ma devices to be plugged into the hub. Good. (Credit to AndroidLover at RootzWiki for this info)
- It is possible to make your own USB OTG Cable with Power, or modify some USB Chargers for OTG functionality if you have some basic soldering skills and equipment.
- Most "dedicated" android USB Chargers have the "Data" pins sorted to tell an android device to use "AC Charging" ("fast charge") instead of "USB Charging". This "prevents data communication and only allows charging. Without a correctly "isolated" OTG Power Cable, OTG will not work with most chargers. Some chargers will either have shorted data pins (i.e. HTC), a low resistance across the pins (i.e. HP) or an "Open" (nothing) across the pins (i.e. aftermarket "Apple" chargers).
- Recommended minimum apps to use with USB OTG:
StickMount, USB Device Info, USB Host Diagnostics, ES File Explorer (or Similar)
Purchase Links for USB OTG items I Use with my TP
I just verified that if you get the Micro USB Host OTG Cable With USB power ($6 from AppleCable on Ebay) that Ramjet73 mentioned (or this one), it will work with any standard USB charger (ie the 1 Amp HTC or 2 Amp HP Touchpad Charger) because the USB Power Connector is Isolated. I also picked up Applecable's USB 2.0 3 Port Hub with data Sync Charger cable for $7
(I may try to modify it to be a USB OTG powered hub with this OTG Adapter and this USB to 3.5mm/1.3mm Adapter to power the hub directly from "ANY" USB charger.
EDIT: It works fine, but modified it anyway).
Here's some updated AppleCable Ebay Store links (4-18-14):
Micro USB Host OTG Cable With USB power
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
USB OTG Cable Schematics. HP TP Needs Cable 2 or Cable 3
If you are able and want to make your own OTG cable, use the schematic for cable 2 (or cable 3) as needed for the TP.
Here are some pictures of an earlier version I made (Cable 4, not recommended) as an example.
Markmx6's HTC USB Charger/Powered OTG Cable Mod Part 1 of 2 : (Reposted here with permission)
Markmx6; said:
First off, I am not responsible for you screwing up your phone, shorting your house out, frying your SD card, burning down your home, or anything else that may or may not occur from you building this...
Tools you will need: Razor blade, Soldering iron, Solder, Super glue.
Optional tools: Dremel with cut-off wheel.
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I started with components I imagine you will all have, since they came with the phone. The HTC charging cable and outlet adapter.
First, cut around the base of the outlet adapter. This is around 3/16" thick, and the cut is better off to be made on the "shiny" plastic than the "dull" portion. I used a Dremel, but any type of blade will do, it just may take more time.
Make a cut along the white line on the board (Shown in red here) Otherwise this will not work. On typical chargers they short out the Data+ and the Data- connections (mpg2 edit: it forces "AC Charging" mode). Not sure why... Digging a razor blade across this several times should do the trick, but if you want to make sure with a continuity tester that will always give piece of mind.
Now you need to cut your cable, I recommend leaving around 2" or more from the standard usb side. (A little of this wire will come in handy for later in this project)
Cut and then strip your wires, there will be a braided shielding wire just under the insulation. Then it will be helpful to "Tin" the ends of your wires.
The shielding can be completely removed, or you can ground it out, but I haven't found this to be needed.
You will now need to solder the wires to the circuit board. This will obviously need to be in the correct order.
From the top will be:
RED = 5V+
WHITE = Data +
GREEN = Data -
BLACK = 5V-
Now you can re-assemble the Outlet adapter if you choose.
Now you need to cut up the other (phone) end of your cable to enable the OTG function.
Post 2 will outline this.
Click to expand...
Click to collapse
Markmx6's HTC USB Charger/Powered OTG Cable Mod Part 2 of 2 : (Reposted here with permission)
Markmx6; said:
Carefully cut down the sides of the connector, if you can do this in one clean cut it will be helpful when you re-attach then after your modifications.
Carefully cut away the plastic, and what looks like hot glue. You need to expose the side that has a blank terminal. and the one on the other side that has a black wire.
Pins 4 and 5 need to be attached, so a small piece of wire (from the leftover ends of the cable comes in handy) works really well.
It doesn't really show up in the pictures though
Now re-glue the pieces from the end of the cable back onto the connector
That is all.
For usb storage you need to have all of the cables hooked up before you insert the SD card.
Click to expand...
Click to collapse
Sent from my "Up all night, Sleep all day" EVO3D!
I got to looking around and wondering with the parts I have if I am setup for OTG and just need to plug everything together without hacking up a power supply which I'd prefer not to do.
Here's what I have on hand:
I ohmed out the " CrazyOnDigital 2 port charger's" data pins:
Port1-pin3 & port2-pin3 = 0.1 ohms (and about 30k to gnd/shld)
Port1-pin2 & port2-pin2 = 0.1 ohms (and about 30k to gnd/shld)
(I also reversed the leads in case I was reading through a diode)
So it looks like the data pins on this aren't shorted together and that it will function as a Powered USB "y" cable/pass through between ports 1 & 2.
Part 2
I realize that my purchased USB OTG cable won't plug in between the charger & my phone (Schematic #1) so I may use a USB extension Cable and USB A to A adapter that I have (not pictured) or I may just hack a spare USB A to Micro USB (5pin) cable that I have into another OTG Cable.
Q: My understanding is that an OTG cable has the ID pin (pin 4 of the 5pin Micro) tied to Gnd, like Markmx6 did in his original cable; correct? So, that's why the micro USB end gets cut open a bit.
A: Yes.
----------------------------------------------------------------
My Additional References:
Zoom [DIY] MicroUSB Host Cable
So in a normal micro/mini USB cable, there are 4 wires, 5 pins.
1. Red - V+
2. White - Data -
3. Green - Data +
4. Empty
5. Black - Ground
That micro male to mini female cable above has the 4th (5th?) wire, brown. This is the ID wire. Shorted to ground, it makes the cable a host cable.
Click to expand...
Click to collapse
Wikipedia's: USB On-The-Go page
The OTG cable has a micro-A plug on one side, and a micro-B plug on the other (it cannot have two plugs of the same type). OTG adds a fifth pin to the standard USB connector, called the ID-pin; the micro-A plug has the ID pin grounded, while the ID in the micro-B plug is floating. The device that has a micro-A plugged in becomes an OTG A-device, and the one that has micro-B plugged becomes a B-device. The type of the plug inserted is detected by the state of the pin ID .
Three additional ID pin states are defined[4] at the nominal resistance values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin. These permit the device to work with a USB Accessory Charger Adapter which allows the OTG device to be attached to both a charger and another device simultaneously.[6]
These three states are used in the cases of:
- A charger and either no device or an A-device that is not asserting VBUS (not providing power) are attached. The OTG device is allowed to charge and initiate SRP but not connect.[6]
- A charger and an A-device that is asserting VBUS (is providing power) are attached. The OTG device is allowed to charge and connect but not initiate SRP.[6]
- A charger and a B-device are attached. The OTG device is allowed to charge and enter host mode.[6]
Click to expand...
Click to collapse
Micro-USB connector pinout
-----------------------------------------------------
Part3: SUCCESS! (with Otg Enabled kernel)
I went ahead and modified a spare USB A to Micro B cable for OTG without power. Plugged everything up with my Logitech Wireless USB mouse and it works! Cool as can be! See new pics. (Yellow wire is the Jumper).
Still have a few questions:
Q: Would the "purchased" OTG Cable already have pin 4 & 5 Shorted?
A: YES it should, but one of the cables I bought was defective.
Q: Does your OTG setup from the op charge the phone at the same time (and/or keep it charged)?
A: Yes (Not Likely on the HP TP)
Edit: Apparently I broke the +5v wire during reassembling the cable. See pictures.
My CrazyOnDigital 2 port charger doesn't have the data pins shorted (D+ and D-) like the stock HTC unit. This causes any "Android" device to charge at the lower 500ma Max "Charging USB" rate vs "AC Charging" (explains my slow charging when travelling), but a bonus is that it allows me to pass data b/w the 2 ports like a simple hub.
- If the D+ and D- pins are shorted when an OTG USB cable is plugged in, the phone will go into "AC Charging" mode, but not allow OTG devices to work, but if the phone is still connected and the data pins opened back up, you retain "AC Charging" mode and have USB OTG functions.
(I'm thinking that a simple on/off switch installed across the data pins of my charger will give me a dual mode charger).
---------------------------------------------------------
AC CHARGING / USB CHARGING (Data Pass Through) MOD 12-1-12I am not responsible for you screwing up your device, shorting your house out, frying your SD card, burning down your home, or anything else that may or may not occur from you building this...
- I got tired of having a 2 port 2 Amp charger that only allowed 500ma "USB Charging" with Android & OTG. See pix:
Post 8 for me.
Originally Posted: 2/23/13
Q: Does anyone know for certain if it's possible on the touchpad to echo the OTG "mode" command (ie host vs none) ?
On the evo3d there is a sysfs command that can be "echoed" to enable OTG with any standard cable and I was able to get the Kernel Tuner dev to add a toggle in his app for it.
If I can find someone who knows & can verify the sysfs command for our CM touchpad's I can have him add it into the app easily (Apr2014 Edit: KT not currently in development).
Note: I haven't found it yet by digging around with EsFileExplorer and activating OTG with a cable.
Mpgrimm2 said:
Didn't know OTG could be activated (on the Evo3D) using a standard cable with a sysfs command like:
Code:
echo host > /sys/kernel/debug/msm_otg/mode
Options are "host" or "none" (maybe this command can get added to "kernel Tuner" app! ). Wonder if it's the same for the Touchpad.
Fyi, don't know how different it would be on each device (ie GS3 vs. Evo3d & HP Touchpad), but it looks like for the Touchpad on CM9 it's
Code:
/sys/kernel/debug/otg/mode
Click to expand...
Click to collapse
I realize some may say "why bother, just use an OTG cable", but if you look through my OTG mod thread, you will realize that it's one less wire to solder to a circuit board and will also allow any user to avoid buying the cable.
Note: I also posted this in my [MOD] Self Powered USB OTG on the HP Touchpad! (v2 Full Size) 11-30-12 thread.
Dorregaray said:
In kernels 2.6.39 and newer the sysfs entry is named msm_otg. We're using the 2.6.35 kernel where the entry is named otg. The available options are: none, peripheral and host.
It seems that the:
Code:
echo host > /sys/kernel/debug/otg/mode
command should work.
Click to expand...
Click to collapse
Mpgrimm2 said:
Thank you for the feedback.
Code:
/sys/kernel/debug/otg/mode
That's what I was thinking too, but I can't seem to see any change of state at that location when activating it with a shorted ID pin and the developer for Kernel Tuner indicated that he added the code for it which doesn't seem to work either.
When I check the mode file there isn't anything there (blank). I have also tried settings permissions for rwx-rwx-rwx and manually typing "host" and saving the file. It goes immediately back to a blank file.
Admittedly I'm an amateur and was trying to echo it with an /init.d script at one point (edited with EsFileExplorer), shouldn't that work? I will fiddle with it some more.
Click to expand...
Click to collapse
Dorregaray said:
First of all try to echo from a terminal app on running system and check if it works, check also the dmesg if there's no error there. If it will be working then you can add an entry to init.d script
Click to expand...
Click to collapse
Last one for me. Feel free to comment.
Trouble with OTG/Touchpad/DS4 controller
I hope someone can help me. I am trying to connect my Dual Shock 4 PS4 controller to my Touchpad via OTG, so I can use Remote Play for my games. I am rooted, using PAC MAN ROM 4.4.4RC-1. Through trial and error (and this forum), I discovered that a normal OTG cable will not work. So, I ordered and received my powered OTG cable in the mail from China (I found the link in this thread a couple of weeks ago). Unfortunately, the HP Touchpad still doesn't seem to recognize the DS4, so I want to make sure I am doing this correctly. Pictures of the cable are attached, along with my setup. The only thing missing from the pix is the connection of the male USB side of the cable to the iPhone wall charger (the cable is very short to get all in one picture). I lost the official Barrel charger 2 years ago, but the iPhone wall charger DOES charge my Touchpad when in Android mode, so not sure why it won't work for OTG connectivity.
1. I connect the DS4 to the micro-USB controller cable that came with the PS4.
2. I then connect the male USB side of that cable to the female USB of the powered OTG cable.
3. I then connect the micro-USB of the powered cable to the HP Touchpad.
4. I then connect the male USB side to the female iPhone wall charger (I lost the TP Barrel charger a couple of years ago).
And I get nothing. The DS4 seems to have no connectivity with the HP Touchpad using this method.
FYI: Again, I am rooted and running Pac Man Rom 4.4.4RC-1
The strange thing is that when I connect the Touchpad to the iPhone wall charger when it's on Android, it charges! So I don't understand why it's not working when connected to the DS4. Is the official Barrel charger the only one that will work? Do I need to install some app or software to get the DS4 to be recognized via OTG?
Any help you can provide would be greatly appreciated!
Thank you!
ConfusedTouchpad said:
I hope someone can help me. I am trying to connect my Dual Shock 4 PS4 controller to my Touchpad via OTG, so I can use Remote Play for my games. I am rooted, using PAC MAN ROM 4.4.4RC-1. Through trial and error (and this forum), I discovered that a normal OTG cable will not work. So, I ordered and received my powered OTG cable in the mail from China (I found the link in this thread a couple of weeks ago). Unfortunately, the HP Touchpad still doesn't seem to recognize the DS4, so I want to make sure I am doing this correctly. Pictures of the cable are attached, along with my setup. The only thing missing from the pix is the connection of the male USB side of the cable to the iPhone wall charger (the cable is very short to get all in one picture). I lost the official Barrel charger 2 years ago, but the iPhone wall charger DOES charge my Touchpad when in Android mode, so not sure why it won't work for OTG connectivity.
1. I connect the DS4 to the micro-USB controller cable that came with the PS4.
2. I then connect the male USB side of that cable to the female USB of the powered OTG cable.
3. I then connect the micro-USB of the powered cable to the HP Touchpad.
4. I then connect the male USB side to the female iPhone wall charger (I lost the TP Barrel charger a couple of years ago).
And I get nothing. The DS4 seems to have no connectivity with the HP Touchpad using this method.
FYI: Again, I am rooted and running Pac Man Rom 4.4.4RC-1
The strange thing is that when I connect the Touchpad to the iPhone wall charger when it's on Android, it charges! So I don't understand why it's not working when connected to the DS4. Is the official Barrel charger the only one that will work? Do I need to install some app or software to get the DS4 to be recognized via OTG?
Any help you can provide would be greatly appreciated!
Thank you!
Click to expand...
Click to collapse
I will hopefully touch base with you shortly. PM sent.
Small update. Spoke over the phone briefly and he was able to get USB OTG working with a USB mouse (had to unplug/replug OTG cable from TP to have it initialize each time) so it looks like he has the basics for a working OTG setup and an OTG enabled ROM.
Might be the version of ps4 controller he is using or the apk/driver that enables it to work.
Hopefully more to come. Anyone else try this setup before? Chime in.
He is on
[ROM][OFFICIAL][KitKat 4.4.4][TENDERLOIN] PAC-man KK RELEASE [WEEKLY]http://forum.xda-developers.com/showthread.php?t=2779954
[NEW][ALL][PORT][4.0+] PS4 Remote Play for Android (New Thread)
http://forum.xda-developers.com/showthread.php?t=3068225
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An confused update
ConfusedTouchpad said:
Hi ....just an update following my email earlier:
1. I went to a local PC Repair place and they let me use a 5.3V wall charger, to see if some added juice might be enough to get the DS4 recognized by the TP over the OTG cable. Unfortunately, nothing.
2. I went to Gamestop and they let me connect their DS4 to the Touchpad, to see if it would work (using the iPhone wall charger I brought along). Again, nothing.
3. I don't know how this happened, but at one point during the process, the Touchpad turned completely blue and would not respond to anything. I was able to reboot by holding the Vol button down, plus the other 2 buttons. Freaky.
Maybe this info + my earlier email might help you know what's going on? It doesn't seem like this is going to work for me, but you never know.
Thanks!
Click to expand...
Click to collapse
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Another thought on the matter,
Last time I dug into OTG TP setup, there was an issue with either the kernel or the msm chipset that prevented it from using any device directly connected to the OTG cable/port that was asking for more than 100ma or so (ie USB portable drives, CDROM's, etc). You would think this doesn't matter since we are providing power externally separate from the TP but it didn't know that.
The work around was to connect a powered USB hub between the touchpad and the device so that the Touchpad sees the low power Hub on its port, and the hub acts as the middle man supplying the full 500ma out to the device, ie the DualShock4 controller.
Got a powered USB hub handy?
See post 2 for a picture of my hub setup.
(I see I mentioned this in post 1 also)
If u want to see the details, you can get USB port and current draw info from the USB Device Info app or USB Host Diagnostics app linked at the bottom of post 1
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Mr. Grimm....as always, thanks for the info. Other than your responses, it's pretty much crickets in here, eh? (Think everyone else abandoned this thread a long time ago).
I am a little confused about your post below. I did see posts #1 and #2, where it was stated that regular OTG cables wouldn't work for the TP, that you need a powered USB one. That's why I bought and tried a powered cable....in fact, there was a link to it in post #2: "Micro USB Host OTG Cable With USB power".
So if I understand your post below correctly, you're now saying I need something ADDITIONAL (power or an additional cable) on top of the one I just purchased? I'm not sure I understand....I thought I had done what I was supposed to. I connected the USB male part of the cable to the iPhone charger, and also a 5.3V wall charger I tried at a PC Repair store and neither would work. The only thing I've gotten to work, occasionally, is the USB mouse connected to the cable. DS4 not working.
Any help would be appreciated....thanks!
mpgrimm2 said:
Another thought on the matter,
Last time I dug into OTG TP setup, there was an issue with either the kernel or the msm chipset that prevented it from using any device directly connected to the OTG cable/port that was asking for more than 100ma or so (ie USB portable drives, CDROM's, etc). You would think this doesn't matter since we are providing power externally separate from the TP but it didn't know that.
The work around was to connect a powered USB hub between the touchpad and the device so that the Touchpad sees the low power Hub on its port, and the hub acts as the middle man supplying the full 500ma out to the device, ie the DualShock4 controller.
Got a powered USB hub handy?
See post 2 for a picture of my hub setup.
(I see I mentioned this in post 1 also)
If u want to see the details, you can get USB port and current draw info from the USB Device Info app or USB Host Diagnostics app linked at the bottom of post 1
Sent from my LG G4 on Tapatalk.
Click to expand...
Click to collapse
You MAY need the hub if the Ps4 controller indicates it needs more than 100ma on the USB port. Perhaps you can pick one up at Walmart and return it later if it doesn't work.
- Yeah, I don't think many people actually use or have tried OTG with their Touchpad. So there may not be a lot of traffic here.
Most of my OTG info actually originated from my Evo3D threads because it had the same chipset and processor as the Touchpad.
Sent from my LG G4 on Tapatalk.
Thanks. Is 100ma more than the stock TP barrel charger provides? Maybe I should just order one of those off Ebay, if that will provide the power needed, since I need one anyway after losing it. Is the USB hub more powerful than the barrel charger?
Also, adding all these things makes for a really clunky setup and sadly reduces the convenience of OTG connection. I guess I will have to decide if it's worth it.
mpgrimm2 said:
You MAY need the hub if the Ps4 controller indicates it needs more than 100ma on the USB port. Perhaps you can pick one up at Walmart and return it later if it doesn't work.
- Yeah, I don't think many people actually use or have tried OTG with their Touchpad. So there may not be a lot of traffic here.
Most of my OTG info actually originated from my Evo3D threads because it had the same chipset and processor as the Touchpad.
Sent from my LG G4 on Tapatalk.
Click to expand...
Click to collapse
ConfusedTouchpad said:
Thanks. Is 100ma more than the stock TP barrel charger provides? Maybe I should just order one of those off Ebay, if that will provide the power needed, since I need one anyway after losing it. Is the USB hub more powerful than the barrel charger?
Also, adding all these things makes for a really clunky setup and sadly reduces the convenience of OTG connection. I guess I will have to decide if it's worth it.
Click to expand...
Click to collapse
That is not exactly the issue, but you should be using a 2 Amp (2000ma) charger with your Touchpad. 1.8A may work fine though. (Stock is 2.0 or 2.1 Amp I believe)
Regardless of getting 'enough' actual power from a charger to the devices, here is the deal/conversation between the TP's chipset (Host device) and the DS4 controller's usb chipset...
DS4: knock knock. Hi, I'm a device that needs 480ma from your USB port, can you let me in.
TP: From behind the closed door... Sorry, only 100ma or less here.
DS4: But I have my own USB power. [email protected]#%
(TP lets hot little 30ma thumbdrive through, followed but 35ma mouse)
Later... Ds4 comes back with its cute little 75ma Hub friend...
Hub: knock knock. Hi, I'm a device that needs 75ma from your USB port, can you let me and my friends in?
TP: From behind the closed door... Uh, sure you all look like only 100ma or less.
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I don't know many people where I moved to recently but if I can get my hands on a ps4 controller, I can see how thing work on my setup.
Please install those 2 USB info apps I mentioned before, they will help identify what the TP sees on its port:
USB Device Info
USB Host Diagnostics
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