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ipod charging at 0ma or 100ma or 500ma

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rbhawaii:
I have had my ipod video 240gb with rockbox on it for years now.  I am so happy with it that I bought a bunch more to last me the rest of my life!   I had no clue my player was charging (in rockbox mode) at 100ma when it could have been charging at 500ma.  I (like very many people) dont read the manual until I REALLY need to figure something out.  So, I would like to make a respectful suggestion to make the SETTINGS/GENERAL SETTING/SYSTEM/BATTERY/CHARGE DURING USB CONNECTION menu look like this...

No 0ma
Yes 100ma
Force 500ma

instead of simply...
No
Yes
Force

Thank you kindly for your time and help!

torne:
No, because that is not what those settings mean. "No" doesn't draw no power; it only limits to 100mA, because otherwise it makes it tricky to recover an ipod whose battery has run down (we do know how to disable charging but haven't figured out a way to implement it that doesn't risk devices being stuck with no power). "Yes" draws 100mA or 500mA depending on whether it can determine that it's connected to something that can provide 500mA safely or not - if you plug it into a computer it will draw 500mA just fine in basically all situations. Unfortunately nobody has yet implemented Apple's AC charger detection scheme, so we can't currently draw 500mA from chargers, but this is possible (since Apple's firmware does it) and once it's been done it will work just fine.

"Force" overrides the detection, but only after some time has elapsed; it will draw 500mA from dumb wall chargers but when connected to an active host it should stick at 100mA until the host gives it permission to draw more power, to prevent it from overloading the host port. This setting is basically a workaround for us not having implemented positive charger detection yet; once we have, nobody should need to do this unless they have a crappy charger that doesn't actually identify itself as a charger (all Apple chargers identify themselves, and modern smartphone chargers do too).

So.. the reason it's not described like that is because that's absolutely not how it works :)

bertrik:
I have an ipod nano 1g. Perhaps I can work on apple charger detection.
I think we know now how to detect it (as far as I know we can tell that from some ADC reading).

torne:
I know part of what we need to work out to make this work; I will dig up my research this weekend if I can and post it so other people can work on it.

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