Rockbox General > Rockbox General Discussion

iPod Nano 50% less play time.

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the_winch:
I did some tests using a 4.5v power supply.

Idle after booting
apple
~15.6 mA
~60.5 mA with Back Light

rockbox
~25.8 mA
~71.7 mA with BL
~34.7 mA cpu boosted no BL
during playback. My multi meter is a bit slow so these are estimates.
~29mA
~41mA boosted.

Doesn't look like reducing the amount of time the cpu is boosted will help that much.

EDIT
Tests done on a nano.

saratoga:
the_winch:  Which iPod?  I assume it has frequency scaling enabled?

Assuming Apple uses the same idle frequency as Rockbox, that would certainly imply theres some hardware running in Rockbox that should be disabled.

the_winch:

--- Quote from: saratoga on February 18, 2007, 02:18:28 PM ---the_winch:  Which iPod?  I assume it has frequency scaling enabled?
--- End quote ---

Nano

soap:
These numbers are very interesting.
The only question I have is, did you account for battery charging in any way?
I think the most valid way of doing this would be to unplug the battery, and wire in the external power supply directly, not using the dock connector at all.

saratoga:
I think he did use a 4.5 V power supply, though maybe that was just to measure power use?

Still, this reinforces my suspicions that getting that Sansa emulator working so we can read off all the registers and I2C traffic the retail PP firmwares use is going to be absolutely critical to getting the PP ports working as well as retail.

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