Nexus 7 2013 Timur's Kernel USB OTG + Charging is here

[ChocoboX]

Mod edit: Op removed, see the last post of the thread.

 

[TabletNoob]

Guys, its really great ROM for car, its better (and cheaper) than any double din on market!

The new nexus 7 has better performance and screenn so its should be Significant upgrade.

Please, feel free to supports this campaign

 

[kingston73]

I read the links and I guess I'm just slow. Could you explain what this is exactly?

 

[flar2]

Timur's ROM USB OTG + Charging, allows USB devices to be connected while charging the tablet at the same time. Basically, his rom is meant for Nexus 7 in-car installation. It manages USB devices, deep sleep, etc.
http://mehrvarz.github.io/nexus-7-usbrom/

Timur has started an Indiegogo campaign to raise funds to start working on his rom for Nexus 7 2013 model

If anyone would like to pledge their support to create the ROM please use the following link:
http://www.indiegogo.com/projects/usb-rom-nexus-7-2013

I'll hold off buying the new Nexus 7 till I see USB OTG + Charging done. If not I may just go ahead and get 2012.

You can do OTG + charging with version 1.6 of ElementalX kernel: http://forum.xda-developers.com/showthread.php?t=2389022

 

[ChocoboX]

You can do OTG + charging with version 1.6 of ElementalX kernel: http://forum.xda-developers.com/showthread.php?t=2389022

Good news! But the ROM can keep connections to USB devices after the tablet goes to deep sleep so when the tablet comes back from deep sleep there are no problem with USB devices plugged-in. Do you happen to know if that's supported?

 

[flar2]

Good news! But the ROM can keep connections to USB devices after the tablet goes to deep sleep so when the tablet comes back from deep sleep there are no problem with USB devices plugged-in. Do you happen to know if that's supported?

I saw this app posted, I haven't tried it myself
http://forum.xda-developers.com/showthread.php?t=2461267

 

[tni.andro]

I saw this app posted, I haven't tried it myself
http://forum.xda-developers.com/showthread.php?t=2461267

That app doesn't really fix the problem. It just acquires a wakelock (PARTIAL_WAKE_LOCK) and prevents deep sleep.

 

[hagensieker]

I use this the USBROM and Timur Kernel on two Nexus 7 2012's. It is fantastic (for me) as I use my tablets hooked to a DAC and charge at the same time.

The latest Cyanogen Mods for Nexus 7 2013 support the installation of a USB Dac however you can't charge. I solved the problem by using the Qi wireless charging system and bought a Nexus 4 wireless charging orb. Works perfect for the Nexus 7.

I'm a big fan of this guys work. Looking forward to it.

John

 

[flar2]

Good news! But the ROM can keep connections to USB devices after the tablet goes to deep sleep so when the tablet comes back from deep sleep there are no problem with USB devices plugged-in. Do you happen to know if that's supported?

So I take it the problem is that power is removed from the usb peripheral when it goes to sleep and the state is lost when it wakes up?

I tested with stock and that's what happens.

When it's in usb host charge mode, the usb peripheral will resume normally as long as power is maintained. So, if I connect a power source and a usb stick to a y-cable, then plug it into the tablet with the OTG adapter, charging starts and the usb stick is automatically mounted by Stickmount. I start a movie that's on the usb stick, then I press power to put the tablet to sleep. Wait for a minute. It's still charging, so not in deep sleep. Turn it back on and the movie starts back up no problem. But like with stock, if power is removed, the usb stick no longer works.

I'll have to take a look at this with debugging turned on.

From what I remember, the shorted 4-5 pin on the OTG cable triggers host mode, then the otg driver uses vbus to sense when another usb device is connected. As soon as it senses 5V, it tries to connect with the peripheral device. I'm guessing when the 5V is taken away, it disconnects the device immediately and it loses state.

I might be able to do something about this.

 

[hagensieker]

You can do OTG + charging with version 1.6 of ElementalX kernel: http://forum.xda-developers.com/showthread.php?t=2389022

That is great news. I'm a guy who would use that feature. Just tried to install ElementalX on top of CM10.2 latest nightly and it doesn't work but I can confirm this works on top of AOKP ROM

In his directions it must be manually enabled though. But it works like a champ!

 

[FauxDreams]

So I take it the problem is that power is removed from the usb peripheral when it goes to sleep and the state is lost when it wakes up?

I tested with stock and that's what happens.

When it's in usb host charge mode, the usb peripheral will resume normally as long as power is maintained. So, if I connect a power source and a usb stick to a y-cable, then plug it into the tablet with the OTG adapter, charging starts and the usb stick is automatically mounted by Stickmount. I start a movie that's on the usb stick, then I press power to put the tablet to sleep. Wait for a minute. It's still charging, so not in deep sleep. Turn it back on and the movie starts back up no problem. But like with stock, if power is removed, the usb stick no longer works.

I'll have to take a look at this with debugging turned on.

From what I remember, the shorted 4-5 pin on the OTG cable triggers host mode, then the otg driver uses vbus to sense when another usb device is connected. As soon as it senses 5V, it tries to connect with the peripheral device. I'm guessing when the 5V is taken away, it disconnects the device immediately and it loses state.

I might be able to do something about this.

Does your Kernel support a USB DAC/AUdio?
If so, It means this weekend I can finally put my N7 2013 into my car.
I've been holding off as I've been waiting for USB DAC + OTG Charging so it can be permanently mounted in the car.

Cheers
Mat

 

[TabletNoob]

Does your Kernel support a USB DAC/AUdio?
If so, It means this weekend I can finally put my N7 2013 into my car.
I've been holding off as I've been waiting for USB DAC + OTG Charging so it can be permanently mounted in the car.

Cheers
Mat

Hi,
USBROM has powerevent manager that "care" to disconnect\reconnect the devices when no voltage on usb line,
i think you will have to restart the device each drive.

in addition, take a look at N7 2012 rom features.
the most of features are really necessary for car install.

 

[flar2]

Does your Kernel support a USB DAC/AUdio?
If so, It means this weekend I can finally put my N7 2013 into my car.
I've been holding off as I've been waiting for USB DAC + OTG Charging so it can be permanently mounted in the car.

Cheers
Mat

If it's not eenabled in stock, then no. But I can add support in the next version.

 

[goofball2k]

That is great news. I'm a guy who would use that feature. Just tried to install ElementalX on top of CM10.2 latest nightly and it doesn't work but I can confirm this works on top of AOKP ROM

In his directions it must be manually enabled though. But it works like a champ!

flar2 (another ottawan! hi!) has stated in his thread that with the latest CM nightlies, his kernel no longer works

Note: as of October 2, ROMs based on Cyanogenmod nightlies are broken and no longer work with this kernel.

Using his kernel with carbon rom and it rocks. I haven't acquired a USB OTG + charging cable but now i'm on the hunt!

 

[jo0b4k4]

How come I see "project has been canceled" when I go on indiegogoindie gogo.

 

[TabletNoob]

yep, bad news...

 

[flar2]

Does your Kernel support a USB DAC/AUdio?
If so, It means this weekend I can finally put my N7 2013 into my car.
I've been holding off as I've been waiting for USB DAC + OTG Charging so it can be permanently mounted in the car.

Cheers
Mat

Actually, it might be enabled on 1.6. I check my config and I think everything necessary is enabled.

Please let me know if it works, I don't have any usb audio stuff to test with.

flar2 (another ottawan! hi!) has stated in his thread that with the latest CM nightlies, his kernel no longer works



Using his kernel with carbon rom and it rocks. I haven't acquired a USB OTG + charging cable but now i'm on the hunt!

Good luck finding any of that stuff in Ottawa I had to order my otg adapter and y cable on ebay

@TabletNoob
I will try to get most of this stuff working on the kernel side, thanks for the PM.

 

[FauxDreams]

son fartcw

Actually, it might be enabled on 1.6. I check my config and I think everything necessary is enabled.

Please let me know if it works, I don't have any usb audio stuff to test with.
.

Ok, I noticed in sys/modules there is a "snd_usb_audio"

I have OTG charging enabled, that works. But I can't get a USB DAC to work like it did with my CM10.2

Currently running stock rom + elementalX 1.6

First time I installed elementalX 1.6 I had the CM10.2 ROM and had major graphical issues lol Whoops

thanks

 

[hagensieker]

Actually, it might be enabled on 1.6. I check my config and I think everything necessary is enabled.

Please let me know if it works, I don't have any usb audio stuff to test with.




Good luck finding any of that stuff in Ottawa I had to order my otg adapter and y cable on ebay


@TabletNoob
I will try to get most of this stuff working on the kernel side, thanks for the PM.

I can confirm that an older AOKP build with the OTG charging works with a Nuforce UDAC USB Dac with elementalx 1.6 installed.

I tried to flash the latest AOKP over the top and then reinstalled elementalx and all I got was a blue pixelated screen. Same thing that happens over new CM 10.2 nightlies after Oct 2 (as stated).

John

 

[FauxDreams]

Ok, So now running Cleanrom & ElementalX.

OTG charging working but USB DAC still not working unlike with Cyanogenmod10.2 Nightly.



I am using a Muse-Audio USB DAC

Thanks