Rockbox

This is the bug/patch tracker for Rockbox. Click here for more information.

Quick links: Bugs · Patches · Rockbox frontpage

Tasklist

FS#8802 - iPod does not charge via an AC -> USB adapter

Attached to Project: Rockbox
Opened by Jason Trible (JasonT) - Tuesday, 25 March 2008, 20:48 GMT+2
Last edited by Marc Guay (Marc_Guay) - Tuesday, 08 July 2008, 06:39 GMT+2
Task Type Bugs
Category Battery/Charging
Status Unconfirmed
Assigned To No-one
Player type iPod 5G
Severity Low
Priority Normal
Reported Version current build
Due in Version Version 3.0
Due Date Undecided
Percent Complete 0%
Private No

Details

Problem:
Can no longer charge my 30Gig iPod Video device with a connector that plugs directly into the wall

Additional Information:
-If I boot into emergency disc mode (hold down select and play on reboot), the device will still charge so I do not think it is an issue with my hardware, or with my AC adapter
-This has worked in Rockbox before, but I don't typically charge this way so I don't know when this broke.
-Originally there was a patch I needed to apply to make this type of charging work. At some point, it started working in Rockbox proper. Then, apparently, it broke again.
-I can go back to older builds if someone needs help narrowing down when this broke
-Charging via a USB port appears to work fine.
This task depends upon

Comment by Jason Trible (JasonT) - Tuesday, 25 March 2008, 20:50 GMT+2
Sorry, didn't include version - last tried this with r16690-080318
Comment by ferdinand sitko (sitko) - Wednesday, 26 March 2008, 09:39 GMT+2
I have the same behaviour with my iPod 20 GB Color/Photo.
Last working release by me was r15845-071129.
Than I tried r16290-080212 and bug was already included.
Comment by christian (kiese) - Wednesday, 26 March 2008, 11:49 GMT+2
i have the same problem with my ipod nano. it could not charge in ipod software also. usb works.
Comment by Boris Gjenero (dreamlayers) - Thursday, 27 March 2008, 05:25 GMT+2
I hooked measured USB charging current on a 5th generation 30 gig iPod. Only the ground and +5V lines were connected. When running Rockbox r16819, charging current was just under 100mA. When running the original firmware, version 1.3 (latest) the iPod drew 0.42A.

I also felt that USB charging from my computer was too slow in Rockbox when I plugged in USB while holding MENU so Rockbox stays running normally. I didn't measure the current but based on charge rate I'm willing to bet it's limited to 100mA. In Device Manager in Windows Vista, the power tab for that particular USB hub on the motherboard showed that the iPod had requested 500mA, but that doesn't control how much it uses.

Various iPods use the LTC4066 chip for charging and USB power management. For info about the chip, see:
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,C1078,C1088,P12292
Pin 13 (HPWR) of that chip is an input which selects between 100mA and 500mA charging. Perhaps that corresponds to a GPIO bit which Rockbox needs to manipulate.

The current limiting part of the LTC4066 doesn't apply to Firewire charging, and charging from Firewire in Rockbox is fast.
Comment by bob (bobbozzo) - Monday, 21 April 2008, 06:00 GMT+2
Same problem here, with firmware downloaded today.
Tried both the Apple wall charger, and a car usb charger.
iPod 30GB Color/Photo
Comment by bob (bobbozzo) - Monday, 21 April 2008, 06:03 GMT+2
To be more specific, I'm running firmware r17194.
Thanks

Loading...