Ipod Accessory Detect

[MitchJS]

Accessory Detect/Identify:
a) A simple resistor to ground allows the iPod to determine what has been
plugged into Omni connector. There is an internal pullup on Accessory Identify.
b) Two pins required (Accessory Identify & Accessory Detect)
c) Reference Schematic Diagram below:


Resistor Table

[Gart]

I have been trying the accessory detect with a 515k resistor. From you table it looks like it won't work. Is this true?

Gart

[kabturek]

do you know anything about battery pack ?
ie : voltage etc ? i see that Belkins uses 4 AAA batteries ...
is there a resistor used by the wall/usb/firewwire charger ?
what about the car charger ? how is it diffrent from the firewire charger ?

[MitchJS]

i dont know the answer to any of those questions

BUT

with 1m ohm resistor, when power is removed (aka key off)
the ipod will go into pause

oddly enough the UART seems to be enabled without any resitors

but without the resistor, the disconnect, if in lingo 4, it wont return to normal

mitch

[ridax]

oddly enough the UART seems to be enabled without any resitors
but without the resistor, the disconnect, if in lingo 4, it wont return to normal

This behaviour is very different between different versions of the iPod. The 3rd gen iPod won't recognize UART commands inless the resistor is there, while newer iPods will. If I recall correctly, different Ipods behaved differently when disconnecting as well, but I don't remember exactly which one did what...

[MitchJS]

well... i dont have much experience with theses IPODS

i dont really even use mine!


i have a 5G Ipod Photo 60g


Q: how in the hell do u put pictures on it? (if any)
PS.. there is NO way in hell im installing ITunes!!!!

mitch

[Guest]

Hey, what happened to the resistor table? I see your post cuts off right where that starts. Has apple legal been mucking around here?

[MitchJS]

its here, you cant be a guest to see images!

mitch

[der-flo]

Hi guys,

is there an accessory type which enables the UART and allows simultanously charging an iPod Nano? I tried the 500k resistor, but as soon as I connect the iPod to the firewire power supply, it does not react anymore on UART commands. Oddly, if I first send a command, and THEN connect the power supply, it works. But for me it seems, that this is not an appropriate behaviour.

What do you think?

Thx, Flo

[MitchJS]

that seems like a backwards connection scheme

power should be applied to ipod at the same time as the accessory dectect is gnd...

in any case i use 1meg ohm for my stuff...

also connecting and disconnecting power has no effect on my uart

which is UART enabled and auto pause on power disconnect

mitch

[udecker]

power should be applied to ipod at the same time as the accessory dectect is gnd...

in any case i use 1meg ohm for my stuff...

Mitch, something I was thinking about. When you connect an iPod Hi-Fi to the iPod, you get a "Speakers" menu item on the screen, and are able to control additional settings from there.

Do you, or anyone else on the board, know how the iPod Hi-Fi is identifying itself, (what resistance it's using) as well as what commands it's sending (and then receiving, from the menu).

I'm asking because this is one example of the iPod reacting to a dock-connection. I'm sure there are others, and I'd imagine that it would queue up a different set of commands. (Picture importer, voice recorder, etc.)

-Craig

[kabturek]

Mitch, something I was thinking about. When you connect an iPod Hi-Fi to the iPod, you get a "Speakers" menu item on the screen, and are able to control additional settings from there.

Do you, or anyone else on the board, know how the iPod Hi-Fi is identifying itself, (what resistance it's using) as well as what commands it's sending (and then receiving, from the menu).

I'm asking because this is one example of the iPod reacting to a dock-connection. I'm sure there are others, and I'd imagine that it would queue up a different set of commands. (Picture importer, voice recorder, etc.)

-Craig

yeah it's very interesting. i also though of that. Especially the interaction between ipod and the radio on the wired remote control. When you connect the radio you can choose stations on the ipod screen. it whould be great to know how can it be done.

greets

[udecker]

yeah it's very interesting. i also though of that. Especially the interaction between ipod and the radio on the wired remote control. When you connect the radio you can choose stations on the ipod screen. it whould be great to know how can it be done.
greets

We should compile a list of devices that cause this to happen.
We know for a fact:
Radio Transmitter
iPod Hi-Fi
iPod+Nike

Any others? Does anyone have these devices, and can intercept the commands?

How about we create a second cable/PCB, one that connects to the accessory, identifies the resistance, and passes the pins to computer, and then we use Mitch's cable on a second serial port to connect to the actual iPod and pass whatever information between them, with the computer in between?

Ideas?

[MitchJS]

The speakers is part of the new accessory ID lingo, which is encrypted!!!
to keep us and more likey UN LICENSED accessory manufacturers

without alot of loging, and some good crypto analysis..

at this point, till someone cracks it, NOT going to happen... new accessories and lingos
are prob out of our reach

mitch

[spingk]

What resistor should I use to get the ipod to go into voice memo mode?