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Rockbox on sansa consumes more power

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Llorean:
Please, random guesses aren't going to solve this. As I said, it affects ALL PortalPlayer devices, and not other Rockbox devices, which strongly suggests it's something on the PortalPlayer chip, and not how Rockbox handles other things.

As well, the original Sansa Firmware does the same thing with the LCD.

X86:
Llorean all the portalplayer chips have the same trouble,ohh... god,ok then is a common problem,ok and I'm going to analyze and think what's making that

cvitullo:
by the way, i think that when the original firmware turns off the screen it pauses everything but the audio, the play time is always behind when you press a button and the screen turns back on. as far as i know, rockbox doesn't do this. forgive me if i'm wrong, i'm just a noob.   :(

Toni:
I did some current measurements a few days ago with the Sansa:

Deactivating:
 - the lcd-device (when backlight off)
 - the ata-controller (if no read/write in progress)
Setting/resetting the correspondent bits in the DEV_EN register did the job.
In addition the usb device can be switched off (and on if needed).
I could reduce the current from 55mA to 41mA during mp3 playback.
The cpu frequency affects by ~1mA/4MHz.
Sleeping both cop and cpu has no effect. So a better solution might be to reduce the cpu/cop frequency if both cpu/cop are idling.

As a first step, frequency scaling should be enabled for the sansa.

JdGordon:
what current is the OF pulling during mp3 playback?

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