Problem:
The X will not charge!
Situations:
1) My xbox 360 is plugged in, but off. The Droid X will not charge. Turn on the xbox & the X starts to charge. Turn off the xbox and the X continues to charge...
2) My computer is plugged in, but off. Plug the Droid X in and it will not charge. Turn the computer on, the X starts charging. Turning the computer back off, the X continues to charge...
Idea:
A powered usb port is not enough to charge the X and changing usb modes does nothing. It needs some sort of usb acknowledgment from a computer to start the charging. Thinking about some sort of Force Charge app, though I don't know where to start...
um......are you saying that when you plug your X into a usb port on your Computer or your Xbox, it won't charge when the Devices are turned off?
I don't know of any device that supplies power to a usb port when its off, i.e. power off means usb port off too....
Maybe I'm mising something, but if you were to plug anything like an external hardrive, into your devices they shouldn't recieve power while the device is off.
wesscoggin said:
um......are you saying that when you plug your X into a usb port on your Computer or your Xbox, it won't charge when the Devices are turned off?
I don't know of any device that supplies power to a usb port when its off, i.e. power off means usb port off too....
Maybe I'm mising something, but if you were to plug anything like an external hardrive, into your devices they shouldn't recieve power while the device is off.
Click to expand...
Click to collapse
Plenty of device supply power to ports when they are off. How else are you supposed to use the BIOS features that allow a computer to be turned on using a KB or mouse? Do a Google search for "PC off USB on" you'll find plenty of posts about people complaining there devices stay powered on when they turn there PC off.
Ok, maybe I can explain this a little better....
The xbox 360:
When the device is "off", yet still plugged in, it still draws some power (what they call it phantom power). The usb ports still have power to them, and other parts, such as the wireless radio receiver is still powered, so you can turn it "on" with a wireless controller.
Now if one plugs a Droid X into the 360 in its "off" state, the phone will not charge. Turn the xbox "on", meaning you can play games (or go to the xbox dashboard) and the phone starts to charge. Keeping the phone plugged in and turning the xbox "off", the phone continues to charge. This means that something must initiate a charge and just having a powered usb port, is not enough.
Why the stock charger works, I do not know? It certainly doesn't have a computer in it...
PC:
My pc does the same thing: if the computer is "off" (meaning the motherboard still has power), then the phone will not charge. Turning the pc "on" (which eventually starts windows) is enough to charge the phone. Specifically the phone starts charging as soon as the bios says something along the lines of: initiating usb connections. Then turning the computer back "off", the phone still charges...
Well, I guess that is a cool feature on some devices that I had never heard about.
Forgive my ignorance.
First of all, as techy as I am, I don't claim to know everything about computers; however, the only time I've ever seen a computer able to turn on from the keyboard is if it's hibernating or in standby, never off completely. I built dozens of my own machines and support hundreds within a business environment and have yet to see such a feature built in.
If this is in fact what you are referring to, then the usb power on the ports during this mode is in a low power state (on most machines). These days, some modern boards are now coming with the ability to have full usb power to charge devices while the machine is in standby/hibernate/off.
I just built a machine using a gigabyte board that just came out with this feature in April of this year (http://www.gigabyte.com/microsite/185/on-off-charge.htm), so if you don't have this feature (or similar), it probably won't charge when the machine is off.
SiXiam said:
Ok, maybe I can explain this a little better....
The xbox 360:
When the device is "off", yet still plugged in, it still draws some power (what they call it phantom power). The usb ports still have power to them, and other parts, such as the wireless radio receiver is still powered, so you can turn it "on" with a wireless controller.
Now if one plugs a Droid X into the 360 in its "off" state, the phone will not charge. Turn the xbox "on", meaning you can play games (or go to the xbox dashboard) and the phone starts to charge. Keeping the phone plugged in and turning the xbox "off", the phone continues to charge. This means that something must initiate a charge and just having a powered usb port, is not enough.
Why the stock charger works, I do not know? It certainly doesn't have a computer in it...
PC:
My pc does the same thing: if the computer is "off" (meaning the motherboard still has power), then the phone will not charge. Turning the pc "on" (which eventually starts windows) is enough to charge the phone. Specifically the phone starts charging as soon as the bios says something along the lines of: initiating usb connections. Then turning the computer back "off", the phone still charges...
Click to expand...
Click to collapse
I think you need to check the usb ports on the Xbox with a voltmeter to see if there is 5V there when the xbox is "off". Do the same with your PC. I personally dont think there's output voltage on the usb ports when those devices are off. At least I know the PS3 usb ports are definitely not putting out 5V when its off, same with my PC that has a ASUS mobo.
Some newer motherboards support this feature, as dvation191 pointed out about the Gigabyte board. But even they mention, depending on the device, the system might have to be on first. I'm sure things will get better in the near future too, as in become a part of the standard.
HostileJava said:
Plenty of device supply power to ports when they are off. How else are you supposed to use the BIOS features that allow a computer to be turned on using a KB or mouse?
Click to expand...
Click to collapse
It's the other way around, the port is supplying the power to the device.
When a computer is off, the motherboard still has power, and it basically recognizes that something is plugged in to the port. But it doesn't always mean that there is enough power fed to the USB port to charge a device.
To turn the system on with k/b or mouse, it's basically just looking for a signal that only requires use of minimum voltage, which is being fed to the k/b or mouse from the USB port, it recognizes a specific interruption and system powers on.
This feature has existed even before USB.
Like derek4484 said, checking the USB port with a voltmeter is the way to find out if your not sure if your PC or console supports full USB power when system is in the off state.
The Omnia was like this. If you look at the USB cable where it plugs into the droid x, I will bet it will have different pins than the wall wart...
Maybe you guys are just not understanding what I'm saying, or I am very bad at explaining it.
The ports on my xbox and my pc have enough power to charge the Droid X, even in an "off" state. I don't need a voltmeter because I know it charges the phone. What is wrong is it won't initialize a charge when the device is off. Meaning the device has to be "on" for it to start charging. Then you can turn it "off" and it will continue to charge. Something in the Droid X is not allowing it to charge, without some sort of initializing.
Hi folks.
I am looking into installing my Nexus 7 permanently in the car, needing the use of being able to charge it, and use an USB DAC at the same time.
This page promises to have an ROM that is able to do that, but I have been unable to get that to work at all. I do not want to upgrade to 4.2.x due to the known bugs, so it's 4.1.2 for me at the moment.
http://goo.gl/fQ2LL
Using a stock ROM i am able to start/stop playback with Tasker registering "AC charge" - How do i go about this when using an OTG-Charge ROM ?
I do not want to charge the tablet when i'm not driving the car, what happens to the USB DAC when the power is cut, does it lose sync with the Nexus 7, and requires a reboot to function again?
So in short this is what I had in mind:
Ignition on -> Tasker registering AC power, starts playing music.
Ignition off -> Tasker registering power is off, pauses music, tablet go to sleep after at set amount of time.
I am realising that this may not even be possible, I can't see how the USB connection should survive, when the power is being cut, but maybe some of you more experienced guys can chime in on this subject.
I would rather not make any modifications to the tablet, but if this is neccessary to make it work, i'll have to do it (e.g. feed power directly to the battery with Li-Ion charging circuit.
Any other ideas of letting Tasker know that the car is started ? I have a bluetooth handsfree in the car, but that is connected to my iPhone, so I cannot use that as a wakeup function when that connects as Tasker do not have any "Blutooth Near" functions...
I've tried to connect 5V to the POGO pins on the side, but it won't charge the battery this way (it's enabled in the 4,2,x ROM afaik)
I've wired up my USB OTG cable like this: http://goo.gl/vqc3F
Any ideas is very welcome, as I cannot see how to do this.
Regards,
// Per.
I'm looking at doing the same thing but also a USB flash drive and also a Joycon EX Steering Wheel Control PC Interface via USB.
What I'm debating on doing is instead of hooking the charger to the ignition to turn on n off with he car I'm thinking about using constant power and hooking up an input on the joy on to the ignition 12V and setting the screen to come on n off with the car.
Unfortunately this means the tablet will be on the charger 24/7 but not sure how else to make sure everything reconnects as it should.
Anyone else have any ideas?
Sent from my Nexus 7 using xda app-developers app
I'm planning on doing a car install with all the bells and whistles also:
Joycon Ex
USB DAC (E10 or Behringer?)
USB Hard drive
Powered USB Hub
From what I've read of other threads, some people have trouble getting the DAC to reconnect after power changes, and some don't. In general, the rule of thumb is as long as the N7 is booted with the DAC attached, you should be able to unplug (or stop powering it), and then start again. There seem to be some behavioral exceptions with this (e.g. if you don't stop audio playback before putting the tablet to sleep with tasker, when it wakes up, you may need to fiddle with it before it starts working again).
It's a long thread, but I'd recommend reading this:
rootzwiki.com/topic/30615-can-you-charge-usb-host-mode-simultaneously/page__st__140
Timur has provided multiple patches that are trying to satisfy everyone's exceptions in trying to get this working.
Before the post, I'd like to know if the wireless charger works in power off mode?
If yes, then possibility unlike to solve in below way.
As suffering, when touch screen unresponsive (while the wireless charger light will blink), previously way is to cycle reboot and keep the pad vertical. In most of cases it will work.
And my idea is to turn off the wireless charging function from kernel.
Nexus 7 2013 uses TI BQ51051B as the wireless charger and it controlled by PM8921 chip.
So possible to disable wireless charger config in flo? But I saw no CONFIG_WIRELESS_CHARGER in flo setting, why?
I don't have a wireless adapter to test, anyone available to recompile the kernel to try to disable it?
CONFIG_BATTERY_ASUS_BQ27541=y
this is the acture config to disable for the wireless charger
You can just remove back cover
As i remember from other phone, all the Qi charger things just connected to micro-usb port.
I have USB Host Mode working on my NST Glowlight with Renate NST's UsbMode.apk 1.7, but after enabling host mode my battery drains in about a day, even after disconnecting the keyboard and disabling host mode.
This is a problem Renate NST noted a few months ago in this long thread,. Has any progress been made on the issue?
Sorry, no.
I have to work on debugging the driver.
Okay, good to know. Thanks for all your hard work anyway!
Could you clarify how the "Off/100mA/500mA/Auto" buttons are supposed to work? Can these be used to limit power drawn while in USB host mode?
The selection of charger current can be used a few ways.
The main purpose is to set it to zero when you are using host mode and powering an isolated device.
If you didn't do that the Nook would try to charge itself using the current that it is supplying to the USB device.
That would be a bit unproductive!
For fast charging you can hit the 1.5A button.
The default position should be Auto when you are done.
I use the 7inch Galaxy A6 (SM-T280) in a few applications that need USB communication. Unfortunately the electronics that the device is plugged into cannot also tell it to draw more current at the moment. When it is connected like this there is a red cross over the battery symbol and it loses charge over time.
For the time being I have used a modified USB cable with the data lines shorted together and communicated over Bluetooth, but that is also presenting issues. This makes the tablet charge properly, but I'd like to remove the reliance on Bluetooth.
What I want is for the tablet to know that it is capable of drawing more current (the power to the USB ports on the electronics are rated for over 2A). The tablets are already rooted to enable boot on charge which was done by modifying the lpm file in system/bin to start the boot sequence once power is applied to the USB port. I was hoping there was another file or line I could modify to enable the tablet to always fast charge. I'm not concerned about this "breaking the rules" on USB devices, so even if it means this happens all the time, then I'm ok with that.
Thanks!