Hey guys,
I just bought a solar USB Hub (with white LEDs as a torch) from Ebay and combined it with the OTG Cable to have a portable USB Hub.(no need for AC adapter except charging the hub from time to time) I had to do a little mod to prevent Evo draining the battery of the hub to charge itself. If you decide to do the same thing, when you cut the OTG cable and original hub cable, there are 4 wires, you only connect black, white and green, leave red disconnected. This way the hub doesn't provide power to the phone (otherwise you can use it only for 2 minutes or so). I then disabled automatic mounting of USB devices (despite unmounting it in terminal properly, unmounting always gave error: unexpected USB device disconnect) and used USB OTG helper v4.0 to mount and unmount. Everything is great now
ozkaya said:
Hey guys,
I just bought a solar USB Hub (with white LEDs as a torch) from Ebay and combined it with the OTG Cable to have a portable USB Hub.(no need for AC adapter except charging the hub from time to time) I had to do a little mod to prevent Evo draining the battery of the hub to charge itself. If you decide to do the same thing, when you cut the OTG cable and original hub cable, there are 4 wires, you only connect black, white and green, leave red disconnected. This way the hub doesn't provide power to the phone (otherwise you can use it only for 2 minutes or so). I then disabled automatic mounting of USB devices (despite unmounting it in terminal properly, unmounting always gave error: unexpected USB device disconnect) and used USB OTG helper v4.0 to mount and unmount. Everything is great now
Click to expand...
Click to collapse
WoW!
How You got Your Evo charging in OTG mode??
I have modified 2-port portable charger Bliss PowerBank u12000 and stock microusb<=>usb cable (NOT otg cable), and when I turn HOST mode on by running
PHP:
echo host > /sys/kernel/debug/msm_otg/mode
my Evo stop charging, but start detecting other USB devices plugged in another port of charger (I have connected same pins inside it and unsoldered all other resistors between them).
And, uhh... where can one buy this said solar powered usb hub? I haven't found anything on google
posedatull said:
And, uhh... where can one buy this said solar powered usb hub? I haven't found anything on google
Click to expand...
Click to collapse
Not the same model, but here's one on eBay. Also available on Amazon.
And here's the one from the OP of this thread. It even has a flashlight. Also available on Amazon or eBay.
ramjet73
S-trace said:
WoW!
How You got Your Evo charging in OTG mode??
I have modified 2-port portable charger Bliss PowerBank u12000 and stock microusb<=>usb cable (NOT otg cable), and when I turn HOST mode on by running
PHP:
echo host > /sys/kernel/debug/msm_otg/mode
my Evo stop charging, but start detecting other USB devices plugged in another port of charger (I have connected same pins inside it and unsoldered all other resistors between them).
Click to expand...
Click to collapse
are you saying that you use a usb charger to support OTG and charge when not used as OTG ?
that u12000 unit would be great if you did what i ask about..
i realize it does not support OTG + charging at the same time..
i have an HP Touchpad that i would like to apply the mods from this thread.
tahnx
I have some HP TP otg mods and a USB charger mod (others too) that you might, be interested in...
[MOD] Self Powered USB OTG on the HP Touchpad! (v2 Full Size) 11-30-12
Also check out: [Tips and Tricks] OTG (USB Host Support) - Requires kernel support
Edit: It looks like you found it.
Here's a similar one http://amzn.com/B0084JVMBU but I don't see a spec for the battery capacity & charge rate (might be 700mah).
mpgrimm2 said:
OK I see what he did with the charger. It uses an adapter (host) cable to go from the main hub port to the PC (mini-USB to full size USB-A).
It looks like he spliced the micro-USB OTG cable (pin 4&5 shorted) to a mini-USB cable, and made a custom OTG Host cable. He mentions he disconnected/broke the +5v wire to prevent it charging the phone due to the small battery in it (understandable). I wouldn't do that myself, but I'd also ideally want a 3000-4000mah Solar Hub to modify for OTG & keeping the phone/tablet charged.
Have a look at my OTG cable schematics in reference post 9 above, particularly cable 1.
Sent from my "Up all night, sleep all day" HP CM9 Touchpad
Click to expand...
Click to collapse
amkaos said:
are you saying that you use a usb charger to support OTG and charge when not used as OTG ?
that u12000 unit would be great if you did what i ask about..
i realize it does not support OTG + charging at the same time..
i have an HP Touchpad that i would like to apply the mods from this thread.
tahnx
Click to expand...
Click to collapse
Yes, I'm using u12000 exactly as You described, but asked here about OTG and charging at same time. Just open u12000 and unsolder 4 resistors between USB port pins and it will become perfect powered portable USB gender changer.
Yes, it looks like that our Evo's doesn't support OTG and charging at same time(
S-trace said:
Yes, I'm using u12000 exactly as You described, but asked here about OTG and charging at same time. Just open u12000 and unsolder 4 resistors between USB port pins and it will become perfect powered portable USB gender changer.
Yes, it looks like that our Evo's doesn't support OTG and charging at same time(
Click to expand...
Click to collapse
Where is the link to this "u12000"? I've clicked all the links in this thread and don't see anything that lists that item/model #.
Also, by removing the resistors (between D+ and D- lines), you've "likely" limited the output the phone will charge at to 500ma, where as shorted together (or small load b/w) it will usually allow the device to charge at it's max allowed rate. Hopefully you are already aware of this.
mpgrimm2 said:
Where is the link to this "u12000"? I've clicked all the links in this thread and don't see anything that lists that item/model #.
Also, by removing the resistors (between D+ and D- lines), you've "likely" limited the output the phone will charge at to 500ma, where as shorted together (or small load b/w) it will usually allow the device to charge at it's max allowed rate. Hopefully you are already aware of this.
Click to expand...
Click to collapse
Bliss Power Bank U12000 - just google it and find internet shop to buy it.
Yes, You are right, removing those resistors limited default charging current to 0.5A, but I'm using latest FastCharge kernel patch and in smart mode it using full 1A to charge, with no side effects. I just tested mine U12000 and found that it can produce 2.25A in short-circuit on USB, it rated as 2A => fully follow its specifications. It can charge stock Evo 3D's battery up to 3.5 times with fully charged U12000 battery.
mpgrimm2 said:
Where is the link to this "u12000"? I've clicked all the links in this thread and don't see anything that lists that item/model #.
Also, by removing the resistors (between D+ and D- lines), you've "likely" limited the output the phone will charge at to 500ma, where as shorted together (or small load b/w) it will usually allow the device to charge at it's max allowed rate. Hopefully you are already aware of this.
Click to expand...
Click to collapse
"Where is the link to this "u12000"?" .. i googled Bliss PowerBank u12000 and found it.. today i couldnt find english page..
i am still unclear if any charger is easily modded to provide OTG data transfer.. if so, would it still charge when not connected to a OTG cable?
amkaos said:
i am still unclear if any charger is easily modded to provide OTG data transfer.. if so, would it still charge when not connected to a OTG cable?
Click to expand...
Click to collapse
Yes, mine Bliss u12000 charging Evo 3D when Evo 3D is not in OTG mode (connected via STOCK cable, NOT via OTG or so). But when I turn on OTG mode on Evo it stop charging but start detecting other USB devices connected to another port of u12000.
I don't know if any charger can be easily modded, but I think if it has 2 USB ports one above another (like =) and NOT side by side (like - -)
- it can be modded (of course if You can disassemble it).
S-trace said:
But when I turn on OTG mode on Evo it stop charging but start detecting other USB devices connected to another port of u12000.
I don't know if any charger can be easily modded, but I think if it has 2 USB ports one above another (like =) and NOT side by side (like - -)
- it can be modded (of course if You can disassemble it).
Click to expand...
Click to collapse
i dont have evo phone so i ask :: do you enable OTG from the phone Or by just using the OTG cable.. or both actions?
also, i tried to find an English site . have you seen one ?
thanx
amkaos said:
i dont have evo phone so i ask :: do you enable OTG from the phone Or by just using the OTG cable.. or both actions?
also, i tried to find an English site . have you seen one ?
thanx
Click to expand...
Click to collapse
I'm enabling it on phone using terminal emulator (look behind in this thread and You will see exactly how).
No, I didn't seen English site, sorry. I'm from Russia.
mpgrimm2 said:
Where is the link to this "u12000"? I've clicked all the links in this thread and don't see anything that lists that item/model #.
Click to expand...
Click to collapse
amkaos said:
"Where is the link to this "u12000"?" .. i googled Bliss PowerBank u12000 and found it.. today i couldnt find english page..
Click to expand...
Click to collapse
Here's the link to the Bliss PowerBank U12000. I translated that page to English in Chrome and the specs are attached, but I don't think Bliss ships outside Russia.
There are many battery based USB chargers available from other sources, including this 12000mAh solar model from usb.brando.com, the same website that has the solar 4-port hub in the OP of this thread. They are Hong Kong based and ship world wide, and their website is available in many languages, including Russian.
If you search for "usb charger" or "usb solar charger' on their site you will find many more models with varying capacities, most of which are probably available on eBay as well.
ramjet73
Related
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
Thanks to a recent video by reverendkjr on Youtube, we now have a confirmed USB OTG method for CM9.
http://www.youtube.com/watch?v=Nc7tlPwFQpg
This has lots of potential and since I did not see much talk about it here, I decided to create a thread with what you need to buy listed in reverendkjr's video and what works. I would recommend only buying from Amazon Fulfilled sellers as they are backed by Amazon's return policy. All 3 items only cost a little over $10.
OTG Cable:
http://www.amazon.com/gp/product/B005QX7KYU
USB Y Cable:
http://www.amazon.com/gp/product/B0041CFFBM
2AA Battery Powered Portable USB Power Supply:
http://www.amazon.com/gp/product/B003M9Z5F6
(Added September 7th)
OTG Cable With Female MicroUSB (Allows you to use any microUSB charger as the power supply)
http://www.ebay.com/itm/130740524313?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
OTG Cable With Male Full Size USB (Allows you to use any power supply with regular USB port)
http://www.ebay.com/itm/Micro-USB-H...i9100-S3-i9300-i9220-i9250-XOOM-/140825132367
You can use whatever source of USB power you want including a wall charger, but I bought the 2AA battery powered supply above and can confirm it works.
Compatibility List:
-Multiple USB devices will work if you use a USB hub. A non-powered one works fine for me since you will already have a separate power source.
-USB keyboards and mice work fine including all basic functions like scroll wheel on the mouse, num and caps lock on the keyboard.
-FAT32 formatted flash drives will mount by default under "/mnt/usbdisk".
(Added September 7th)
-If you want to mount NTFS drives or multiple flash drives, download Drive Mount. This software will mount drives under "/mnt/sda1", "/mnt/sdb1", etc. I can confirm it works for multiple drives and NTFS/FAT32. It was removed from Google Play so the apk has been posted. If anybody has had success with other NTFS mounting software please post your results.
(Added April 6th)
-I tried a Rosewill USB SATA/IDE externally powered hard drive reader and was able to mount a 400GB SATA 3.5" HDD using Drive Mount. Just to see what would happen I tried a SATA DVD drive but Android doesn't recognize it and probably doesn't even support the CD/DVD file system.
(Added April 7th)
-USB card readers will work, but I've had mixed results.
USB Device Info:
If you want to diagnose items and see some info about what the Touchpad is detecting, download USB Device Info free from Google Play. Everything shows up under the Linux tab. This shows some useful info about devices including current draw, device identification, etc. I tested it with a USB hub and a few flash drives and it successfully showed entries for the hub and the flash drives. It wont tell you if Android has drivers for the device, but merely IDs the device(s) confirming the connection if working.
(Added Dec 9th)
A plugged in USB OTG adapter will show up as "Qualcomm On-Chip EHCI Host Controller" under the Linux tab regardless of whether or not power is present. This is a good way to see if you have a working OTG adapter.
Flash Drive Unmounting Issues:
Flash drives are called an SD Card when mounted. There is no option to unmount a flash drive unless you use Drive Mount, so if you notice SD card removal error messages they are referring to your flash drive and not the Touchpad's internal memory partition that is mounted as /sdcard.
When a flash drive is removed or powered off without being unmounted, its common to get a "android.process.media" force close, just tap OK.
Charging:
You will not be able to charge via micro USB while using OTG even if your power source has enough current. You can charge via the Touchstone just fine. Knowing this, you can set up a really nice docking station by using the Touchstone as a stand/charger and then using the microUSB slot for peripherals like a USB keyboard and mouse connected to a hub with spare ports for flash drives, etc.
(Added September 7th)
Insufficient Available Bus Power Fix:
If you get this error, I haven't yet, some users have had success using this app posted on Rootzwiki.
I didn't feel like buying anything and already had some things laying around so I modified an Adafruit MintyBoost to accept a device via usb, add power, and continue on down the line...
Really all I did was solder a usb cable onto the female USB port on the MintyBoost, drill a hole on the other side of the tin and feed it out. The card reader conveniently fits inside of the mint tin so it's a pretty compact package.
The only down side I've noticed is that it also charges the TouchPad (the batteries will die quicker) and continues to send power to the card reader after the OTG cable has been unplugged from the TouchPad.
Excuse the crappy pic. I really don't feel like taking a better one.
I could never get the OTG cable to charge the Touchpad, I always thought when the Touchpad sensed OTG (grounding on pin 4) it refused to take power. You can disconnect the +5v Vcc to the Touchpad (red wire) on your OTG cable and OTG devices will still work.
spunker88 said:
I could never get the OTG cable to charge the Touchpad, I always thought when the Touchpad sensed OTG (grounding on pin 4) it refused to take power. You can disconnect the +5v Vcc to the Touchpad (red wire) on your OTG cable and OTG devices will still work.
Click to expand...
Click to collapse
I came to the same conclusion some days ago ,touch pad can't be charged using org cable,needs a regular micro USB cable and the barrel AC charger.I did many tests but having otg devices working and really charge at the same time its not possible,it seems like charging but its not.
Today I accidentally found this http://direct.sanwa.co.jp/ItemPage/400-GADR002W that by first look it could be awesome...
Edit:a mini review in english http://www.gadget.pdamu.com/2012/03...r-dock-station-for-android-smartphone-tablet/
says that it can be also powered be micro usb charger....
Bummer. Tried linking my phone evo3d, but no luck.
Sent from my PG86100 using XDA
wolfgr said:
Today I accidentally found this http://direct.sanwa.co.jp/ItemPage/400-GADR002W that by first look it could be awesome...
Edit:a mini review in english http://www.gadget.pdamu.com/2012/03...r-dock-station-for-android-smartphone-tablet/
says that it can be also powered be micro usb charger....
Click to expand...
Click to collapse
If its provides its own 5v power it would likely work, but I don't really see anywhere for an external power connection and it looks too small to house a battery.
spunker88 said:
You can disconnect the +5v Vcc to the Touchpad (red wire) on your OTG cable and OTG devices will still work.
Click to expand...
Click to collapse
For whatever reason, when I tried that the card reader wouldn't initialize. Once I connected the +5v from the OTG it'd light right up...
After it lit up I could disconnect the +5v and it'd stop the "charging" notification on the touchpad and keep working.
spunker88 said:
If its provides its own 5v power it would likely work, but I don't really see anywhere for an external power connection and it looks too small to house a battery.
Click to expand...
Click to collapse
it has the regular usb port to connect otg device plus a micro usb female to connect. our ac charger
wolfgr said:
it has the regular usb port to connect otg device plus a micro usb female to connect. our ac charger
Click to expand...
Click to collapse
Then it should work fine as the Touchpad uses a standard OTG pinout, it just doesn't provide power so if it has a way to provide power to devices than I see no reason why it wouldn't work.
quick question that i didn't see answered above :S can i use the otg cable adapter without another power source (like can touchpad power it?)? Saw it asked above but didn't see anyone saying that the power source is required :S
kind of want to plug a usb flash drive into touchpad so I can type documents when I'm on the go and switch to computer. don't want to carry another power source either :S
eyeb said:
quick question that i didn't see answered above :S can i use the otg cable adapter without another power source (like can touchpad power it?)? Saw it asked above but didn't see anyone saying that the power source is required :S
kind of want to plug a usb flash drive into touchpad so I can type documents when I'm on the go and switch to computer. don't want to carry another power source either :S
Click to expand...
Click to collapse
No, the Touchpad doesn't provide any power for OTG devices which is why you need to supply it power. The cheap USB charger I linked to in the original post will work fine for a portable power supply if you don't want to build something yourself.
And it also appears you can't just plug the other USB into the wall?
Sent from my PG86100 using XDA
can someone get a group buy going for these???
spunker88 said:
If its provides its own 5v power it would likely work, but I don't really see anywhere for an external power connection and it looks too small to house a battery.
Click to expand...
Click to collapse
This would be fantastic... but i dont speak Japanese!!
mrtomaso said:
And it also appears you can't just plug the other USB into the wall?
Sent from my PG86100 using XDA
Click to expand...
Click to collapse
So, we can't just plug it into a wall for power? I have to buy a battery powered unit or use a powered hub?
Sent from my cm_tenderloin using XDA
Nice and cheap and the best part it works.
USB Hub works...sort of.
I tried this with a cheap USB hub I bought. I had bought it for my laptop and made sure it had it's own power supply to keep the load off my laptop, so I thought it would be perfect for this. Nice try though.
Turns out it needs 5V from the host to activate as well as the additional external power supply. Just fired it up with my TouchPad connected via a Y-Cable and my Laptop providing the 5V to fire it up. Works like a charm.
As yet to find out if it works with my travel charger providing the 5V and no external power supply plugged in, and how many devices I can hook up. It's got 7 ports so I suppose the supply might be useful then, but do I really need to hook up that many devices? Otherwise...pointless. Back to the drawing board I go.
wolfgr said:
Today I accidentally found this http://direct.sanwa.co.jp/ItemPage/400-GADR002W that by first look it could be awesome...
Edit:a mini review in english http://www.gadget.pdamu.com/2012/03...r-dock-station-for-android-smartphone-tablet/
says that it can be also powered be micro usb charger....
Click to expand...
Click to collapse
This would be really handy and it's a much more elegant solution than a y cable and external power source.
Too bad it seems like we won't be able to get one easily.
Am i missing something here or can i use my 3.5" external HDD (with a power supply) to provide power to my External so i dont have to plug the cable into a USB hub?
mafu6 said:
Am i missing something here or can i use my 3.5" external HDD (with a power supply) to provide power to my External so i dont have to plug the cable into a USB hub?
Click to expand...
Click to collapse
You should, I did this on my Touchpad running CM7. Haven't tried since going to CM9.
Sent from my Nexus S using xda premium
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
First:
Major Credit to SDX's FTEN for being first with his very original idea and micro Usb version of this hardware mod. If it weren't for him, I would not have dared to do this.
See his original thread: Self Powered USB Host on the HP Touchpad! and at RootzWiki
SDX Version of this thread
Rootzwiki Version of this thread
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 you're doing FIRST is the best bet. I take no credit for the original idea, just ran a bit farther out on the branch before it broke.
Afterwards be sure to check out:
[Tips and Tricks] OTG (USB Host Support) - Requires kernel support
and
My 2 Port 2 Amp OTG Charger & Mod post further down.
This is a difficult modification that requires you to completely disassemble Touchpad (correct tools a plus), cut and dremel out excess material from the back cover (risk of permanent damage) and display frame. You also need to have some soldering equipment plus skill with very small circuit boards/traces (if you want more than a full size power port) and loads of patience (this took several hours over 4-6 separate days).
Still interested? Have a look:
Parts:
- USB-A Female Connector from a USB Extension cable (and it's spare wire)
(or optional microUSB breakout as FTEN used in his original version)
- Small, thin, SPDT switch (single pole double throw) from a Dollar Store toy, ie "DollarTree"
- VPack PRT-08290 (5v Regulator) and it's PDF Reference file
- micro USB (M) connector from a cable or OTG Adapter (if you can't get the Enable switch landed you'll need this cut up into a plug with the ID pin shorted)
( or maybe AppleCable's Powered OTG Cable )
Tools:
- Spudger Tool set (or similar for cracking open the TP)
- Variable Speed Dremel with "Rotary File" bit
- Decent Soldering Iron (ie: Weller WES51) with small conical tip, and small electrical solder (LeadFree compatible recommended)
- Hobby knife Set (ie X-Acto with various blades and handles)
- Hot Glue Gun and sticks
Basic Disassembly/Reassembly: iFixit's HP Touchpad Battery Removal Guide
(You should be confident with the above. Be prepared to break a few of the 7 clips; superglue helps).
The Finished Product:
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Part 0 - Parts, Planning, & Schematics:
My Original sketch of the wiring schematic for the mod
The 3.7v to 5vdc Step-Up Regulator board
My wife's Simon Toy supplied the OTG Enable Switch (she wasn't thrilled)
Here's another option for the switch from my local "DollarTree" store
Here's the Full Size USB-A Extension Cable before and after modifiying
Lesson Learned: Go ahead and strip the Potting Material off the USB-A (F) connector to expose the 4 solder points and remove the wires (or at least the 2 DATA lines). I think you will have better success if you "land" the Data wires and OTG Enable Switch wire to the TP's USB Controller Board first and then connect the leads to the USB-A Connector and Enable Switch since those solder points are more durable.
** Make sure that the cable wiring is "Copper Colored" not silver, etc. The copper wire will solder more easily without damage to the USB Controller Board later on **
Part 1 Pictures (MB Power Leads and Routing):
Part 1 pictures (Sim Slot Modification & Test Fitting):
When it's all mounted up (Later) the connector will stick out the back like this:
Part 1 Pictures (Regulator/Connector Placement and Wiring)
Soldering the Battery leads to the Regulator input (take time to get the length & routing correct)
* See Previous note about soldering Data and OTG Switch wire to USB Controller Board First *
Here the 5vdc to the USB connector is soldered to the Regulator Output & a DC Rtn from the regulator is soldered to the switch's "common".
Part 2 Pictures (Sim Slot/Display frame notching)
Part 3 Pictures (USB Controller Board info)
Part 3 Pictures (USB Controller Board info)
Note: You can skip this step if you just want a full size USB-A power port and don't care about it having working "data" communication and OTG Enable Switch (I screwed up the enable switch solder pad).
Please read the notes in the pictures for this section, they will help avoid my mistakes.
Part 4 Pictures (finished)
Updated: 12-3-12
Additional Reference Info
Here'a an OTG Cable reference schematic that I made to help people make their own OTG cables and OTG shorting plugs. It works as a good reference to figure out how a purchased cable is wired up (some are different).
And here's a picture of the micro-USB breakout board (4pins only) from Sparkfun.com that Ften used in his original mod mentioned at the top of the OP. If you prefer, you can squeeze this into the sim slot without dremeling the back cover to a "paper thinness" and hook up your data and pwr to it, but you will have to make or purchase a male microUSB to USB-A adapter (an OTG one would work since there isn't an ID pin hooked up). I avoided this option because I don't want someone hooking it up to a USB wall charger by accident and possibly killing the regulator
2 Port 2Amp USB OTG Charger & Mod
Here's an update...
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/device 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:
Since breaking my power button and not knowing where to find a replacement part, I am very interested in what you are doing here.
I was considering finding a way to install an SDHC card in the same spot you've done your USB port. Do you imagine that there would be any additional complications?
I'd also like to add a power switch via the battery.
Sent from my SAMSUNG-SGH-T989 using xda premium
-SGA- said:
Since breaking my power button and not knowing where to find a replacement part, I am very interested in what you are doing here.
I was considering finding a way to install an SDHC card in the same spot you've done your USB port. Do you imagine that there would be any additional complications?
I'd also like to add a power switch via the battery.
Sent from my SAMSUNG-SGH-T989 using xda premium
Click to expand...
Click to collapse
In case you not aware there is an app called Button Saviour that can mimic all your hardware buttons including power.
Edit which I have just realised is of no help whatsoever if your Tablet is off . Best of luck.
-SGA- said:
Since breaking my power button and not knowing where to find a replacement part, I am very interested in what you are doing here.
I was considering finding a way to install an SDHC card in the same spot you've done your USB port. Do you imagine that there would be any additional complications?
I'd also like to add a power switch via the battery.
Click to expand...
Click to collapse
My suggestion for the power switch would be to get another TP off Ebay to rob for the switch (probably the only way I will get another USB board to finish my OTG mod 100%). I saw the guts of a 16gb (no screen assy) go for $41 the other day.
As for an SDHC card, don't know. You'd probably have to connect it the same way as the OTG connector (pwr & Data). You'd still need the switch or OTG plug to get the TP to check the bus, the 5v step up to pwr it, some sort of micro-Sd "socket (so there's room for the switch) and an app like "StickMount" to mount it for use. Ultimately, it'd still be OTG but without the option to connect anything else. I'd recommend the OTG port instead.
Edit: I updated Part 4 pictures with a fillet around the port and added a link to the OTG Tips & Tricks Thread (Evo3D)
i saw the orig post you referred to in your OP..
altho i like it very much and admire your work, i will never
be qualified to attempt it..
i just wonder why the cable still has to run outside from your new usb port to the micro usb port.
is it stupid to ask why it could not permanently connect from the inside and use a switch for charging / data transfer ?
again, i will never be able to do this so you could ignore this post..
also, from your evo 3d thread, i see that someone uses a 4 port 12000mah
battery charger for data... is this correct?..
i use a solar powered 4 port hub but would like to see a battery charger modded to charger / data transfer w/ a switch..
the solar hub of mine doesnt last so long
thanx foryour reply..
amkaos said:
i just wonder why the cable still has to run outside from your new usb port to the micro usb port.
is it stupid to ask why it could not permanently connect from the inside and use a switch for charging / data transfer?
Click to expand...
Click to collapse
Look closer at the USB Board post pictures. If the OTG switch wire is connected to the board internally, then no external setup is needed. I damaged the board just enough that I couldn't finish it until I can locate another board.
Others may not be willing to attempt the board soldering and choose only a full size power port (or microUSB) that needs the external cable that provides power back to the otg device plugged into the original port.
Sent from my "Up all night, Sleep all day" EVO3D!
mpgrimm2 said:
Look closer at the USB Board post pictures. If the OTG switch wire is connected to the board internally, then no external setup is needed. I damaged the board just enough that I couldn't finish it until I can locate another board.
Others may not be willing to attempt the board soldering and choose only a full size power port that needs the external cable that provides power back to the otg device plugged into the original port.
Sent from my "Up all night, Sleep all day" EVO3D!
Click to expand...
Click to collapse
thanx for the explanation.. i get it now..that makes so much sense
do you know what i was speaking of relating to the mod to a battery charger to switch between charge / otg ?
if possible to do , i could attempt that mod
amkaos said:
also, from your evo 3d thread, i see that someone uses a 4 port 12000mah
battery charger for data... is this correct?..
i use a solar powered 4 port hub but would like to see a battery charger modded to charger / data transfer w/ a switch..
the solar hub of mine doesnt last so long
Click to expand...
Click to collapse
I'm not sure what u mean by this. Post some links or quote the post and I will see if I can figure it out.
Sent from my "Up all night, sleep all day" HP CM9 Touchpad
shoot... sorry i thought i did link...
http://forum.xda-developers.com/showthread.php?t=1916638
to me , this is interesting because the OP shows a modded OTG cable to connect the mini port on his solar hub to the micro port of his evo3d..
this eliminates one cable:: from hub mini port to OTG usb..
he does say how it works but i dont know if the mod would be exactly the same for our HPTP..
i have that same self powered hub and it works fine.. just not much run time.. maybe 700mah.. iirc
secondly post #2 in that thread speaks of his 12000mah charger. it seems to me like he modded it to do OTG..
this would be good because of how much run time it would have..
could be great if he put on the charger a switch for charge / data transfer if it would need a switch to use like that..
anyway your current mod is soo ambitious but i saw you modded a wall charger ..
thanx again
OK I see what he did with the charger. It uses an adapter (host) cable to go from the main hub port to the PC (mini-USB to full size USB-A).
It looks like he spliced the micro-USB OTG cable (pin 4&5 shorted) to a mini-USB cable, and made a custom OTG Host cable. He mentions he disconnected/broke the +5v wire to prevent it charging the phone due to the small battery in it. I wouldn't do that myself, but I'd also ideally want a 3000-4000mah Solar Hub to modify for OTG & keeping the phone/tablet charged.
Have a look at my OTG cable schematics in reference post 9 above, particularly cable 1.
Sent from my "Up all night, sleep all day" HP CM9 Touchpad
mpgrimm2 said:
OK I see what he did with the charger. It uses an adapter (host) cable to go from the main hub port to the PC (mini-USB to full size USB-A).
It looks like he spliced the micro-USB OTG cable (pin 4&5 shorted) to a mini-USB cable, and made a custom OTG Host cable. He mentions he disconnected/broke the +5v wire to prevent it charging the phone due to the small battery in it. I wouldn't do that myself, but I'd also ideally want a 3000-4000mah Solar Hub to modify for OTG & keeping the phone/tablet charged.
Have a look at my OTG cable schematics in reference post 9 above, particularly cable 1.
Sent from my "Up all night, sleep all day" HP CM9 Touchpad
Click to expand...
Click to collapse
hi
so his phone supports data / charging at the same time?
but to mod an OTG cable for hptp and the mini usb port Hub, we just need to replace the usb end?
and leave pins 4 and 5 as they are?
How else would you make it instead..
I looked everywhere for a better self powered hub whether replaceable battery or not and would have liked to find something better.
thanx.. maybe I can try to make one
[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
Sent from my LG G4 on Tapatalk.
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
Sent from my LG G4 on Tapatalk.
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.
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.
Sent from my LG G4 on Tapatalk.
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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