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Sansа Clip Zip - Improve battery life

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saratoga:
Committed fuze delays and usb boost. 

Mihail Zenkov:

--- Quote from: saratoga on January 18, 2016, 05:12:06 PM ---One question, any idea why such a long udelay is needed with frequency scaling? I'm surprised that button read out should be so dependant on CPU frequency.

--- End quote ---

Not sure. Probably delay by udelay depends not only from CPU freq but also from PCLK. Or we need much more delay when GPIO work on boosted clock.

saratoga:
Test builds with frequency scaling enabled but not voltage scaling:

http://mit.edu/mgg6/www/rockbox-clipv2_frequency_test.7z
http://mit.edu/mgg6/www/rockbox-fuzev2_frequency_test.7z
http://mit.edu/mgg6/www/rockbox-clip+_frequency_test.7z
http://mit.edu/mgg6/www/rockbox-clipzip_frequency_test.7z

Source for just this change:

http://gerrit.rockbox.org/r/#/c/1242/

Edit:  Updated builds.

Mihail Zenkov:

--- Quote from: saratoga on January 18, 2016, 06:26:26 PM ---Source for just this change:

http://gerrit.rockbox.org/r/#/c/1242/

--- End quote ---

It not critical, but I think we should change CPU_FREQ to 192000000. Also we should add changes for config/sansafuzev2.h.

saratoga:
Thanks, overlooked both of those.

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