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Subject: Re: Use SLEEP instruction for longer (?) runtime
From: Andrew Jamieson (andrew.jamieson_at_projectlab.net)
Date: 2003-01-23


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.

I would say a saving of 10mA makes this change worthwhile (its very nearly
10%).

This is on an older player (4.53 FW in ROM).

Andrew Jamieson
----- Original Message -----
From: "Simon ElÚn" <simel346_at_student.liu.se>
To: <rockbox_at_cool.haxx.se>
Sent: Thursday, January 23, 2003 8:16 AM
Subject: Re: Use SLEEP instruction for longer (?) runtime

> Andrew Jamieson wrote:
> > Yep. About 10mA on the nose, and this difference is true both whilst
> > playing music and idle. I'd be interested to see what the difference
> > was without the busy LED.
>
> For a theoretical saving of max 20 mA and the simplest possible
> implementation, that's still quite good. What Archos model are you testing
> on?
>
> I've posted new firmware at http://www.cyd.liu.se/~simel346/ that doesn't
> fiddle with the LED. I assumed it would be insignificant in comparison to
> the CPU:s power consumption, but now I see figures like 5 mA being
mentioned
> in other threads...
>
> --
> Simon ElÚn
>
>



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