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Subject: Re: Use SLEEP instruction for longer (?) runtime
From: Andrew Jamieson (ajamiesn_at_optusnet.com.au)
Date: 2003-01-23


OK. From my multimeter at home (I think the one at work need some
calibration :)

                CPU Sleep off CPU Sleep on

Idle 111mA 99mA
Playing 113mA 101mA

Files played were 192kbs CBR.

Now, not having a recorder, I'm not entirely sure what you mean by the F2
screen; however, I assumed from your question that you were asking if
scrolling text on the LCD increased the current consumption noticibly, yes?
Well, setting scroll to 10Hz and measuring between screens that scrolled and
ones that didnt, resulted in no difference in the current consumption. This
held true for idle and playing states.

So, this is a little over 10% saving in current, or just a little less than
going from 1800mAh batts to 2000mAh batts. Not bad.

----- Original Message -----
From: "Simon ElÚn" <simel346_at_student.liu.se>
To: <rockbox_at_cool.haxx.se>
Sent: Thursday, January 23, 2003 8:41 PM
Subject: Re: Use SLEEP instruction for longer (?) runtime

> Andrew Jamieson wrote:
> > It still looks like about 10mA (the multi-meter I have at work makes
> > it difficult to get good readings at low current), so it looks like
> > the LED wasn't contributing that much. I'll get more precise
> > measurements at home tonight.
>
> Could you check if there is any visible difference in power consumption
> between for example the F2 screen and the WPS scrolling text at 10 Hz?
>
> --
> Simon ElÚn
>
>



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