Support and General Use > Hardware
Sansа Clip Zip - Improve battery life
saratoga:
21 hours 29 minutes.
Not bad.
Mihail Zenkov:
You can get slightly better result by accurate tuning CVDD1. Other voltage better leave as in my last patch - it show best result with RMAA.
saratoga:
I am slightly concerned about the lower cpu voltage when unboosted. I think we would need to get a fair amount of people to test that before we are sure its safe. I'm tempted to commit the frequency scaling first, and then follow up with voltage once we are sure its stable. I tend to think theres probably a wide distribution of voltages that are safe between devices.
saratoga:
http://pastebin.com/tTXpLSsj
Patch with cleaned up USB.
One question though, is the voltage reset in rolo.c even needed? The header for that function isn't included, so I'm not even sure if its linked.
Mihail Zenkov:
--- Quote from: saratoga on December 08, 2014, 05:16:54 PM ---I am slightly concerned about the lower cpu voltage when unboosted. I think we would need to get a fair amount of people to test that before we are sure its safe. I'm tempted to commit the frequency scaling first, and then follow up with voltage once we are sure its stable. I tend to think theres probably a wide distribution of voltages that are safe between devices.
--- End quote ---
Yes, you right. I mean for you personal record :) My two devices can stable work on slightly less voltages.
--- Quote ---One question though, is the voltage reset in rolo.c even needed? The header for that function isn't included, so I'm not even sure if its linked.
--- End quote ---
Yes, it linked and work. I just was lazy fix warning. Without it player freeze on booting another firmware though rolo. Also I think better disable frequency scaling if we build bootloader.
In my researches I see two strange behavior:
1. playing wav (16/44.1) consume mostly same power as low bitrate mp3 - is it expected?
2. in test_mem I have read speed much lower than write speed - is it normal?
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