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Sansа Clip Zip - Improve battery life

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Mihail Zenkov:
Sorry, I mean change PLLA and have FCLK 180 / PCLK 90.

saratoga:
Maybe just seeing if FLCK switching from 240 to 24 at constant PCLK works would be best?

Mihail Zenkov:

--- Quote from: saratoga on October 05, 2014, 03:53:20 PM ---Edit:  Unfortunately the tracker is down so I can't check fs#11297, but as I recall, funman added quite a lot of additional code to the frequency switching functions to try and make them more stable.  Perhaps something there is needed?

--- End quote ---
My patch V3 based on this code, but it not totally stable as was mention in tracker.

Mihail Zenkov:

--- Quote from: saratoga on October 05, 2014, 03:58:49 PM ---Maybe just seeing if FLCK switching from 240 to 24 at constant PCLK works would be best?

--- End quote ---
We can't set PLCK constant, datasheet say we should switch PLCK to master clock, but we can't do this in AMSv2.

saratoga:

--- Quote from: Mihail Zenkov on October 05, 2014, 04:02:25 PM ---
--- Quote from: saratoga on October 05, 2014, 03:58:49 PM ---Maybe just seeing if FLCK switching from 240 to 24 at constant PCLK works would be best?

--- End quote ---
We can't set PLCK constant, datasheet say we should switch PLCK to master clock, but we can't do this in AMSv2.

--- End quote ---

Didn't funman's old code set the PCLK to 24MHz and just change the multiplier? 

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