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Touchpad USB OTG Compatibility List

OP spunker88

5th April 2012, 04:20 AM   |  #1  
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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...84.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-Ho...-/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.
Attached Files
File Type: apk au.dach.drivemount.apk - [Click for QR Code] (1.74 MB, 832 views)
Last edited by spunker88; 9th December 2012 at 06:19 AM.
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24th April 2012, 08:25 PM   |  #2  
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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.
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24th April 2012, 11:43 PM   |  #3  
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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.
25th April 2012, 01:54 AM   |  #4  
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Quote:
Originally Posted by spunker88

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.

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.
25th April 2012, 06:59 PM   |  #5  
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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/...tphone-tablet/

says that it can be also powered be micro usb charger....
Last edited by wolfgr; 25th April 2012 at 07:14 PM.
25th April 2012, 08:09 PM   |  #6  
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Bummer. Tried linking my phone evo3d, but no luck.

Sent from my PG86100 using XDA
25th April 2012, 09:51 PM   |  #7  
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Quote:
Originally Posted by wolfgr

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/...tphone-tablet/

says that it can be also powered be micro usb charger....

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.
25th April 2012, 10:51 PM   |  #8  
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Quote:
Originally Posted by spunker88

You can disconnect the +5v Vcc to the Touchpad (red wire) on your OTG cable and OTG devices will still work.

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.
25th April 2012, 11:42 PM   |  #9  
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Quote:
Originally Posted by spunker88

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.

it has the regular usb port to connect otg device plus a micro usb female to connect. our ac charger :)
26th April 2012, 01:45 AM   |  #10  
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Quote:
Originally Posted by wolfgr

it has the regular usb port to connect otg device plus a micro usb female to connect. our ac charger :)

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.

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