TL;DR: 10kOhm between ID and GND
Hi,
I just posted a Kidigi car dock fixed, and also investigated how car mode is enabled.
On previous devices I had, car mode was enabled by a small magnet in the dock, which triggered car dock (Motorola devices use this).
On HOX, this is enabled by puttin a 10kOhm resistor between GND and ID pins (they are adjacent).
Somebody could investigate what other resistances do - there will be at least a dock mode as well (I only tried that it is not activated by shorting those pins).
So if you want to make your car cradle activate car mode, you can mod your cable and get the full functionality of the original overpriced HTC @#$%.
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I have bought myself a car mount for my phone, but what I would like to know is, What actually activates car dock mode on this phone? Some people said their should by a small magnet in the holder that activates a mag switch in the phone? Is that true or should I go into car dock mode manually every time?
it's true "their should by a small magnet..."
According to this page it is the USB cord that activates the car dock mode. It probably has some resistors from a pin to another pin, so that your device knows when to change to dock mode.
The fifth pin is grounded in the charger (actually this is the wiring in type A micro USB plugs, but with the form factor of type B micro USB). The better alternative is to use Google's car panel - you can set it to open itself when connected to your bluetooth handfree, you can have any navigation software launched by it and best of all - it works in landscape (a huge oversight on HTC's part).
tkolev said:
The fifth pin is grounded in the charger (actually this is the wiring in type A micro USB plugs, but with the form factor of type B micro USB). The better alternative is to use Google's car panel - you can set it to open itself when connected to your bluetooth handfree, you can have any navigation software launched by it and best of all - it works in landscape (a huge oversight on HTC's part).
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nice to know
I have an existing car dock (just a holder) and usb cable. How can I trick my evo into thinking it is plugged into a car dock? Is it magnet based?
I don't think it's magnet based, but I think there's a circuit board in the bottom of the official car dock that tells the EVO when it's plugged into that, it's in THE offical car dock (I have one)
The Seidio car dock triggers Car Mode as well. I thought someone posted about it being magnet-based, but I could be wrong.
I think it's done through pins 4 and 5.
I asked this question on the AOKP thread, but I think it'd be better suited here.
So the GalaxyS2 is very similar to the GNex. They share many of the same chips. Specifically, they share the fsa9480 USB switching chip. This is the chip that enables UART mode, and download mode. In the GS2, it can also enable "Car Dock" mode and "Home Dock" mode. I built a car dock cable for my old GS2. Build log is here:
https://plus.google.com/u/0/11396136...ts/5yrxdcYRf59
It allows for analog audio output over the D+ and D- lines on the microUSB port when you apply a resistor of a specific Ohm rating (619K for car dock mode) across pins 4 and 5 in the microUSB male connector. I was hoping that this same cable would work for the GNex as well. However, the phone refuses to charge, and the dock does not output audio. Remember, this has nothing to do with the PogoPins. I ran an adb kmsg when I plugged and unplugged the car audio dock cable. I shared my observations with Adam Outler. You can see that in this post:
https://plus.google.com/u/0/11396136...ts/9bhvFNPhqSa
Is there a way a dev can do more checking to see if car audio dock mode is possible? It was on CM9 on the GS2. I'm willing to do whatever testing is necessary. I'm also going to ask Entropy512 where the code is for the car dock audio for the I777 (or I9100) in CM9. Any thoughts on this? Thanks!
Supposedly Jellybean supports USB Audio Out now and presumably this covers the Gnex as well.
http://www.head-fi.org/t/616507/wow-the-google-jelly-bean-supports-usb-audio-out
Yes, however that is not the functionality I'm referring to. JB's USB audio actually puts makes the phone an "accessory" to a USB device. An example would be those iPhone speaker docks that control/display playlists etc on the dock. What I'm asking for is very different. I think there's a way that this phone will output straight analog audio from the USB port. I might have to ask one of the kernel devs.
Has anyone found/want to recommend a car charger with integrated charger connection (like the official S2 one) which works in landscape mode. Specifically one which doesn't need a wire plugged into the USB port?
Quite disappointed that there doesn't seem to be much that addresses this need.
Hey guys,
i just bought a passiv car cradle for my GN. I need the car mode and doesn't finde anything about the resistor value between the micro pin 4 and 5.
While searching for it, i just had that value for the galaxy s i900. But the 620kΩ resistor doesn't work for the GN.
Am I wrong with the resistor? Is there another method to get into the car mode?
rgl
Download a car home app and run the app.
There is no microusb car dock for the nexus, only a pogo pin car dock.