Support and General Use > Hardware
Sansа Clip Zip - Improve battery life
Mihail Zenkov:
As I mention before - zip consume to much for transferring PCM to DAC. I check DMA - we can use burst mode for better efficacy. Setting burst size to 16 save 1mA. It should be much batter for bigger size, but it don't work correctly for I2SO. Not sure why - I2SO have FIFO 128x36 bit, so bigger burst size should work. IMHO DMA transferring with burst size 16 consume 2mA - it still very much: decoding mp3 consume 2mA.
In any case we very close to 30 hours of mp3 ;)
Mihail Zenkov:
I think I found why we have problem with unboost after usb disconnected.
Mihail Zenkov:
Useful info about DMA:
https://lkml.org/lkml/diff/2010/7/21/498/1
http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka12660.html
http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka11898.html
music_lover001:
--- Quote from: saratoga on January 27, 2015, 10:17:14 PM ---Yes, that is committed.
--- End quote ---
It is very possible that I am unusually dense, but what what committed? I checked, but did not find anything mentioned in the change log.
Mihail Zenkov:
--- Quote from: music_lover001 on January 29, 2015, 06:55:21 PM ---It is very possible that I am unusually dense, but what what committed?
--- End quote ---
http://git.rockbox.org/?p=rockbox.git;a=commit;h=02414bf286e4ff6a08d19e951bff1e0905d330b4
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