Rockbox

This is working fine on the Sansa e200 w/ r16890. Is it specific to the iPod 4G or out of date?

I’m pretty sure this bug can be closed. I grabbed the build for this model on March 23, 2009, version r20492-090323, and can confirm that there is an icon between the battery and volume indicators in the status bar when the USB cable is plugged in. I’m unsure whether the icon is supposed to do beside show up when the device is connected to the computer, but it’s there.

In power_input_status() in power-ipod.c, the 4G iPod detects FireWire power, but not USB power. The status bar shows the plug because the same pin is detected in usb-fw-pp502x.c, and that is reported via usb_connected() returning true. Right now I’m not sure if there are any consequences from not detecting USB in power_input_status().

I think there might be at least one consequence from not detecting USB power in power_input_status(): Connect USB while holding MENU, so you don’t go into the USB screen. Then try to turn off the iPod. It may attempt to turn off. Then after Rockbox shuts down, the iPod would probably start up again because USB is connected.

The attached patch adds this detection. If the iPod tried to turn off in the earlier test, try again with the patch.

   4G_photo_mini_usb_power.patch (0.5 KiB)

Tried this on mini2g and it seems to work fine:
- a connected usb charger gets reported both in the battery debug screen and the Rockbox Info menu
- if a usb power-only connection was established the Ipod doesn’t shut down when holding Play
- on a charger connection the Ipod doesn’t shut down.

bluebrother, did you try those things with or without the 4G_photo_mini_usb_power.patch?

I’m confused by what you said about the battery debug screen. Only Nano and 5G iPods have the battery debug screen section which reports if a USB charger is present. When the Rockbox Info screen says “Charging” that is different. It detects charging rather than the presence of USB power. When the battery is full, it shouldn’t say “Charging” anymore.

I tried with the patch. In my case the battery wasn’t charged completely. In detail:

a. stock Rockbox svn, no patches applied.

1. Connect usb with Menu held. A power-only connection is made. The Debug / View Battery screen shows "Charger: absent". The System / Rockbox Info screen shows "Batt: Charging".
2. Connect a usb wall charger. Same as in 1.

b. stock Rockbox svn with your patch applied.

1. Connect usb with Menu held. Power-only connection is made. Debug / View Battery shows "Charger: present", System / Rockbox Info shows "Batt: Charging".
2. Try to shutdown the player by holding Play. Nothing happens (i.e. Rockbox doesn't shut down as expected).
3. Connect a usb wall charger. Same as 1. again.
4. Try to shutdown again. Same as 2.

Hope this clears this up :)

Thanks bluebrother :)