Develop Bugs

Any one played with JellyBean and usb DAC/AMP?

Hi,
I am planning to purchase a usb dac/amp if the USB Audio is confirmed to work for HOX with CM10/ some specific kernel. I failed to make the HOX acting as USB HOST without a external powered usb hub. But since it s said to be a feature of android 4.1, I wonder if anyone here have done that successfully? (ie. HOX ->USB OTG cable -> USB DAC/AMP -> speaker/ headphone)
Regards,
Kenneth

m2677086 said:
Hi,
I am planning to purchase a usb dac/amp if the USB Audio is confirmed to work for HOX with CM10/ some specific kernel. I failed to make the HOX acting as USB HOST without a external powered usb hub. But since it s said to be a feature of android 4.1, I wonder if anyone here have done that successfully? (ie. HOX ->USB OTG cable -> USB DAC/AMP -> speaker/ headphone)
Regards,
Kenneth
Click to expand...
Click to collapse
I haven't try but I plan to. What I have found is that Android 3 is the first version supporting USB host, but not all the kernel are built to support it (although I guess with CM you'r fine). Then there's the problem of the cable, but I guess that can be solved with few extra bucks.
That's actually a pretty new idea for an old project I have my mind! It would allow me to skip one of the most complicated part of my project: battery-powered amp with charge regulator etc. I found out that addressing this problem (power) would be much more expensive than I thought. If I can use USB host, the phone's/tablet's battery would power the amp and DAC and would not need an additional power source, not to mention the fact that device would stop working when the battery is too low, instead of dying slowly with an undervolted current.
The DAC part is not essential for me, but nice to have. The AMP part definitely yes!
(I want to build a sort of portable internet radio/media streamer with good speakers)

What USB DAC and how to use it in north-american S3?

I'm considering upgrading from my Galaxy S (with voodoo sound and wolfson chip) to Galaxy S3. I'm on Bell. I understand that north-american version does not have wolfson chip and audio is worse than original S with voodoo. I use it for relatively high-quality aftermarket car audio using analog out to audio aux-in.
What are my options for S3? What's the cheapest usb dac I can use with north-american s3 and where to get it in Canada or US online?
Is there any guide about how to set it up?
Thanks!
Note: I reposted it to Q&A where it's more appropriate, but can't find how to delete it here...

it doesn't have the same sound chip???!!? what the hell.. deal breaker! is this true?
Sent from my GT-I9300 using xda app-developers app

midirt said:
I understand that north-american version does not have wolfson chip and audio is worse than original S with voodoo.
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Click to collapse
No wolfson chip for NA version hopefully we get Voodoo kernel soon. Until then, some people have had success using a Fiio e7 plugged into their S3 using USB OTG. As for how they did it, I have no clue.

mtl171 said:
No wolfson chip for NA version hopefully we get Voodoo kernel soon. Until then, some people have had success using a Fiio e7 plugged into their S3 using USB OTG. As for how they did it, I have no clue.
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I did some research on this. Apparently it's possible to plug in a whole bunch of USB OTG devices, including many USB DACs. However as USB port is occupied - they suck power from the phone and phone itself cannot be charged at the same time. There are cables that you can inject USB power but in Galaxy S3 case - only to devices, the phone itself switches to "give power" mode when working in USB ORG mode and does not accept charge over USB. This is a bummer, as there is no way it can hold a battery for long while playing music and working as GPS in a car.
There is a guy on another forum who mentioned that it's possible to force S3 to accept charge with change in kernel (that means it won't power other USB devices, but they can be powered via injected power), but this is beyond my ability. We need somebody who knows how to do this to either build an app, or do a kernel version (semaphore?) or both, that have this module disabled on demand.
Here's what he said:
" However, I was able to modify this kernel to make it accept a charge while in OTG host mode. A Y-cable is connecting my phone to a powered USB hub. The hub has a USB-to-Ethernet dongle, connected to a router. The hub is also powering the Gnex via the other end of the Y-cable. The phone can now, say, act as a WiFi access point (wired + 3G!) and it's battery level will never drop below 100% or 99%. One disadvantage: in a real on-the-go situation, this kernel will not anymore power slave devices. One could fix this by allowing the user to switch between OTG host mode charge-out (default) vs. OTG host mode charge-in."
" On the Galaxy Nexus, removing the complete body of method tuna_set_vbus_drive() in arch/arm/mach-omap2/board-tuna-connector.c will disable charging of OTG slave devices and will allow the OTG host itself to be charged. The battery icon will not be updated by this modification alone."

SUCCESS!!! I can confirm that this USB OTG cable (http://ebayitem.com/190710044655) DOES CHARGE MY GALAXY S3! I plugged in USB cardreader with SD card into the phone through this cable (it lit up and card is fully readable), then plugged USB cable end into PC and phone showed a charging icon! Moreover, after waiting for 5 min. with screen off (cardreader still glowing blue and working) battery has gone up from %72 to %75 (and while I was writing this, to 78%), so it is indeed charging! Yay! It probably won't get up in the car, where just phone alone is "not discharging" at best from the car adapter, but at least it should allow me to listen to music with quality DAC and use navigation without (or with minimal) discharging.
I have not tested it with USB DAC that I intend to use for my car (Behringer UCA222), because I have to go out and buy it. Hopefully it works. Anyway, this cable definitely works with simultaneously charging my north-american Samsung Galaxy S3 (from Bell Canada) while powering USB cardreader!
Somebody else has mentioned that another cable (http://ebayitem.com/120980364117) also worked in his Galaxy S2.

SUCCESS!!! I can confirm that this USB OTG cable (http://ebayitem.com/190710044655) DOES CHARGE MY GALAXY S3! I plugged in USB cardreader with SD card into the phone through this cable (it lit up and card is fully readable), then plugged USB cable end into PC and phone showed a charging icon! Moreover, after waiting for 5 min. with screen off (cardreader still glowing blue and working) battery has gone up from %72 to %75 (and while I was writing this, to 78%), so it is indeed charging! Yay! It probably won't get up in the car, where just phone alone is "not discharging" at best from the car adapter, but at least it should allow me to listen to music with quality DAC and use navigation without (or with minimal) discharging.
I have not tested it with USB DAC that I intend to use for my car (Behringer UCA222), because I have to go out and buy it. Hopefully it works. Anyway, this cable definitely works with simultaneously charging my north-american Samsung Galaxy S3 (from Bell Canada) while powering USB cardreader!
Somebody else has mentioned that another cable (http://ebayitem.com/120980364117) also worked in his Galaxy S2.
Sorry for double post, I posted it by mistake and can't delete the post. Button says "edit/delete" but there is no delete option, just edit...

I bought Behringer UCA222 USB DAC and tested it in my car with the USB OTG cable with power that I mentioned. It works great! And the phone is indicating a charge. Sometimes when first playing music after plugging the device it sounds like fast forward for a few seconds (I guess clock rate mismatch or something similar), but after the presumably clock is locked it plays perfectly fine.

There is a big list of working DACs in the official sound quality thread, along with a lot of other good information.

midirt,
I am working on a car setup like this and would like to ask a question. Somewhere I read that you had to plug microUSB into phone before plugging into DAC in order for it to work. Is this true for you? It would be a pain to have to unplug everything each time you get in car.

BaronInkjet said:
midirt,
I am working on a car setup like this and would like to ask a question. Somewhere I read that you had to plug microUSB into phone before plugging into DAC in order for it to work. Is this true for you? It would be a pain to have to unplug everything each time you get in car.
Click to expand...
Click to collapse
Usually I just plug entire setup into the phone and it works fine. Sometimes when I shut off the engine and start it up (there is power interruption) I have to re-plug the DAC.

midirt said:
Usually I just plug entire setup into the phone and it works fine. Sometimes when I shut off the engine and start it up (there is power interruption) I have to re-plug the DAC.
Click to expand...
Click to collapse
Thanks! Are you happy with the Behringer unit?

BaronInkjet said:
Thanks! Are you happy with the Behringer unit?
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Click to collapse
Yes. Very good DAC, sounds great, and cheap. It's not perfect though: there is definitely a "dirty ground" noise when power is connected - it may not be its fault, I'm using a weird aux-in adapter and all other solutions I tried had the same problem, even phone itself, when connected to power supply. Disconnecting power supply there is no noise. It' not usually noticeable in the car, but it's there and I don't like it. If your car doesn't have noise when phone is connected directly to aux-in and plugged into power, this unit won't have that noise. I just wish they would separate ground or cleaned the power or did something to isolate noisy USB power, but it's too cheap to have that. Nor sure expensive ones can do this either. Ground-lifting transformer from ebay removes the noise, but also reduces quality so I'm not using it.
Another issue is sometimes in the beginning the sound just accelerated and is played fast-forward for a few seconds, then it catches up and plays normal. After that it works OK until restarted. Very weird and a bit annoying but not a deal killer.

USB OTG cable with charging - is that possible?

While researching ability to use USB DAC while charging the phone in the car I found this video. The guy clearly says that tablet is charging while accessing all those accessories via USB OTG. Similar cables are found on ebay, called "USB OTG with power".
The big question is: would the Galaxy S3 actually charge while using USB DAC at the same time? It should be possible, but I don't have the phone yet (still considering it), nor do I have the cable, nor a USB DAC In theory it should be the same with any accessory - can someone actually confirm either way, whether phone can or can't charge in USB OTG mode with similar cable? This video shows similar setup on Galaxy S (only it's normal OTG cable, USB hub, usb Y-cable and card reader) and it's definitely charging while mounting USB devices! Will S3 do the same?
I fear that upgrading from Galaxy S with voodoo control of Wolfson chip to north-American S3 with worse audio path might not suit me if there's no way to power the phone and use external DAC at the same time in the car... I hope there is a way... I appreciate any advice and opinions.

It's a first time I see such cable...All I read was people saying it's impossible in the first place. Well, hopefully in 2 weeks I'll be able answer your question

midirt said:
While researching ability to use USB DAC while charging the phone in the car I found this video. The guy clearly says that tablet is charging while accessing all those accessories via USB OTG. Similar cables are found on ebay, called "USB OTG with power".
The big question is: would the Galaxy S3 actually charge while using USB DAC at the same time? It should be possible, but I don't have the phone yet (still considering it), nor do I have the cable, nor a USB DAC In theory it should be the same with any accessory - can someone actually confirm either way, whether phone can or can't charge in USB OTG mode with similar cable? This video shows similar setup on Galaxy S (only it's normal OTG cable, USB hub, usb Y-cable and card reader) and it's definitely charging while mounting USB devices! Will S3 do the same?
I fear that upgrading from Galaxy S with voodoo control of Wolfson chip to north-American S3 with worse audio path might not suit me if there's no way to power the phone and use external DAC at the same time in the car... I hope there is a way... I appreciate any advice and opinions.
Click to expand...
Click to collapse
HI. I Got it working on SONY XPERIA S now i will play with GALAXY SII AND SIII , check my siganture and website --> follow me i hope i can help

sonic_boom said:
HI. I Got it working on SONY XPERIA S now i will play with GALAXY SII AND SIII , check my siganture and website --> follow me i hope i can help
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Click to collapse
Looks like it's possible on some devices, but not with Galaxy and Nexus family... But it would be great if you can confirm that, so let me know if you can try it. Thanks.

Finally got the cable.
The result - nope, doesn't charge

Maybe the "Allshare hub" could do what your asking for?

sonic_boom said:
HI. I Got it working on SONY XPERIA S now i will play with GALAXY SII AND SIII , check my siganture and website --> follow me i hope i can help
Click to expand...
Click to collapse
Sonic, any luck with your friends phone? Really looking foward to your results :fingers-crossed:
Do you have part #s for the variable resistors in your samsung post or at least where you got them from? I would be willing to try some things out if I could find the right pieces. What I really want to get my hands on is the MHL adapter that was shown off with that spider laptop at IFA a couple weeks ago..

SUCCESS!!! I can confirm that this USB OTG cable (http://ebayitem.com/190710044655) DOES CHARGE MY GALAXY S3! I plugged in USB cardreader with SD card into the phone through this cable (it lit up and card is fully readable), then plugged USB cable end into PC and phone showed a charging icon! Moreover, after waiting for 5 min. with screen off (cardreader still glowing blue and working) battery has gone up from %72 to %75 (and while I was writing this, to 78%), so it is indeed charging! Yay! It probably won't get up in the car, where just phone alone is "not discharging" at best from the car adapter, but at least it should allow me to listen to music with quality DAC and use navigation without (or with minimal) discharging.
I have not tested it with USB DAC that I intend to use for my car (Behringer UCA222), because I have to go out and buy it. Hopefully it works. Anyway, this cable definitely works with simultaneously charging my north-american Samsung Galaxy S3 (from Bell Canada) while powering USB cardreader!
Somebody else has mentioned that another cable (http://ebayitem.com/120980364117) also worked in his Galaxy S2.

I bought Behringer UCA222 USB DAC and tested it in my car with the USB OTG cable with power that I mentioned. It works great! And the phone is indicating a charge. Sometimes when first playing music after plugging the device it sounds like fast forward for a few seconds (I guess clock rate mismatch or something similar), but after the presumably clock is locked it plays perfectly fine.

midirt said:
SUCCESS!!! ...
Click to expand...
Click to collapse
That is outstanding..gonna order one of these guys right now.
Here is a better link for all the ebay listings. Be aware of the differences, MicroUSB adapters would allow you to use your existing charge cable to plug into it while the standard USB would require you to be very close to the charger or have a USB A-A cable to attach to a power source.
http://www.ebay.com/sch/i.html?_trk...Host+OTG+Cable+++USB+power&_sacat=0&_from=R40

Jeremy.Stewart85 said:
That is outstanding..gonna order one of these guys right now.
Here is a better link for all the ebay listings. Be aware of the differences, MicroUSB adapters would allow you to use your existing charge cable to plug into it while the standard USB would require you to be very close to the charger or have a USB A-A cable to attach to a power source.
http://www.ebay.com/sch/i.html?_trk...Host+OTG+Cable+++USB+power&_sacat=0&_from=R40
Click to expand...
Click to collapse
The problem is that apparently not all of those cable work in terms of charging the phone. People say mostly that it doesn't work. The only guy mentioned success is with the cable I bought, but he then confirmed it with another, more convenient cable. I have the one that needs a USB extension cable to reach the charger, but it's about a buck on ebay, so no problem there. But not all cables work this way: most reportedly will allow you to power USB accessories but not charge the phone.

I found that this configuration works for charging while in USB HOST mode:
S3 -> standard otg cable -> Powered USB2.0 HUB -> devices (keyboard, usb dac, usb hdd...)
The only catch is that the hub must be powered before you plug in the phone or the phone will try to power the hub and will never enter charging mode. I'm using this setup in my car and it works perfectly. As long as I start the car before plugging the phone, we are good to go.
I only confirmed this works with AOKP JB builds. No idea about other roms/kernels. Hopefully this helps someone.

midirt said:
The problem is that apparently not all of those cable work in terms of charging the phone. People say mostly that it doesn't work. The only guy mentioned success is with the cable I bought, but he then confirmed it with another, more convenient cable. I have the one that needs a USB extension cable to reach the charger, but it's about a buck on ebay, so no problem there. But not all cables work this way: most reportedly will allow you to power USB accessories but not charge the phone.
Click to expand...
Click to collapse
I got mine in the mail today (ordered 10/16) and tried it out as soon as I could. I can confirm it charges and allows for OTG at the same time. This is the auction I bought from: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251127542280&ssPageName=ADME:L:eek:U:US:3160

Hello y'all. I'd like to ask your attention to this thread, especially but not limited to sonicboom and others, I really could use some help.

Help with Otg

Hello i installed a nexus 7 in my car not i really dont want to take out my center console because its a huge Pita. But i realise that i now need an otg. I was runninh sound via bluetooth to my radio but the lag os crazy. I have acces to the the end of my charging cable. I was wondering would adding a usb to usb adapter and a usb hub. Would that be consider a usb otg cable. Would i be able to purchase a usb dac and use it. Also could i charge at the same time. I have absolutely no room to fit a audio jack on my tablet. So usb dac is my only option.

egren58 said:
Hello i installed a nexus 7 in my car not i really dont want to take out my center console because its a huge Pita. But i realise that i now need an otg. I was runninh sound via bluetooth to my radio but the lag os crazy. I have acces to the the end of my charging cable. I was wondering would adding a usb to usb adapter and a usb hub. Would that be consider a usb otg cable. Would i be able to purchase a usb dac and use it. Also could i charge at the same time. I have absolutely no room to fit a audio jack on my tablet. So usb dac is my only option.
Click to expand...
Click to collapse
You generally need a kernel installing to do as you have said eg elemental x or timurs. Yes, you can then use a usb otg cable to power and host the usb dac.

[Q] Simultaneous Wireless (Qi) Charging and OTG?

Has anyone got both Wireless (Qi) Charging and OTG working at the same time with any combination of ROM/Kernal etc? I've tried all the settings on ElementalX but like others reported, it seems to be one or the other.
Thanks
Nathan
note: OTG + Power is fine, but I'd prefer to use my wireless dock with a DAC as I get ground loop feedback using the same power source

jmone said:
Has anyone got both Wireless (Qi) Charging and OTG working at the same time with any combination of ROM/Kernal etc? I've tried all the settings on ElementalX but like others reported, it seems to be one or the other.
Thanks
Nathan
note: OTG + Power is fine, but I'd prefer to use my wireless dock with a DAC as I get ground loop feedback using the same power source
Click to expand...
Click to collapse
I haven't been able to... idk if it was from me transferring the daughterboard from an older one previously, but I tried!

Great question! I just ordered a DAC for my Nexus 7 (2013). I'm running Lollipop. I have my tablet installed in my car and have been using Bluetooth audio to my DSP, but am upgrading to a DAC for better sound quality via optical output.
While we continue searching for a wireless charging solution, which Lollipop kernels work for USB charging and DAC at the same time? Thanks!

I have not problem with using the ElementalX kernel and USB charging + DAC but... the killer I've found is is your amp is also on the same DC circuit you end up getting a ground loop distortion, which is why I was hopping for a Wireless Charging as it may help with isolation.

jmone said:
I have not problem with using the ElementalX kernel and USB charging + DAC but... the killer I've found is is your amp is also on the same DC circuit you end up getting a ground loop distortion, which is why I was hopping for a Wireless Charging as it may help with isolation.
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Hey bud, can you link me to the Elemental Kernel? How do you connect your cables to get DAC via OTG while also charging the tablet? Thanks so much for your help!

pieces of cake said:
Hey bud, can you link me to the Elemental Kernel? How do you connect your cables to get DAC via OTG while also charging the tablet? Thanks so much for your help!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2389022

Did you ever figure out if you can simultaneously wireless charger with OTG connected to DAC?
I really want to do this.
Tried Elementalx with CM 11 12 and 13, but none seem to do this?