Rockbox mail archive
Subject: Re: games/demos cost on play buffer?
From: BoD (BoD_at_JRAF.org)
wowow wake up in the morning with your favourite mp3 :) too good :)
this feature would be great. It could be coupled with another one: sleep
timer, where the box plays mp3 till a specified time, and with the volume
going decrescendo (and in the end the box turns off). The volume for Wakup
could also go crescendo (for beeing waken up "smoothly").
There's a winamp plugin that does just that, but sometimes the PC noise is
enough to get you awake;)
"Daniel Stenberg" <daniel_at_haxx.se> a écrit dans le message de news:
On Fri, 13 Dec 2002, George Michaelson wrote:
> Extrapolating from this, I infer that the in-memory cost of games and
> has to be marginal as well, ie if one imagined building a version of the
> code without them, the increased memory would give <5% extended battery
> life if the memory saved was measured as 1Mb (unlikely?). for a 10hr
> battery life, thats 30min extra play. For me, thats on the cusp of being
> worth it. But since I expect the SH3 codesize is dense, and so the saved
> memory will be smaller, the net increase in battery life begins to look
> marginal (this is only theory: until I make my build env with a gcc-sh3, I
> can't say what the cost is)
It is an SH1, SH7034. And I'd guess that the size of all games together is
more like in the area 30-50 KB or so. It would be easy to check.
> What other things tend to improving battery life? The backlight costs and
> LCD update also look to be marginal savings at this time.
Not much more can be done, AFAIK. We can verify that we're using the best
possible ATA code that keeps the power consuption at its lowest. We can work
on using the CPU SLEEP mode to reduce power even more, but it requires some
Björn and I were talking the other day about adding a mode where we shut
all external circuits and go to SLEEP. That would bring us down to almost
40mA power consumption and thus we could get a "wake up" function that could
survive ~40 hours on 1600mAh batteries.
It could for example be used as an alarm clock, or to make it survive a
in the car until you start it again next morning and charges your Archos
Of course we have no code for this at this point. We were only dreaming of
new and better worlds! ;-)
Daniel "Bagder" Stenberg -- http://rockbox.haxx.se/
Page was last modified "Jan 10 2012" The Rockbox Crew