On Mon, Feb 16, 2009 at 12:19:41AM -0500, Richard A. Smith wrote:
qu...@laptop.org wrote:
(If one discharges an XO battery outside the XO using a home lighting
circuit, the displayed state of charge will be inconsistent. Persisting
in this practice results in increasing inconsistency.
In a discussion thread like this, it would good to have a source code link
for all to reference, now and in the future.
Thanks for all the contributions!
On Mon, Feb 16, 2009 at 3:36 AM, James Cameron qu...@laptop.org wrote:
On Mon, Feb 16, 2009 at 12:19:41AM -0500, Richard A. Smith wrote:
frederick wrote:
In a discussion thread like this, it would good to have a source code link
for all to reference, now and in the future.
Thanks for all the contributions!
unfortunately, the code in question (i.e., the EC firmware) is
one of the few small bodies of code on the XO which isn't
Richard A. Smith wrote:
The instrumented setup only has a current measurement resolution down to
about 1mA. So there's room for a lot of error in that measurement.
Looking at the schematics I see that there are quite a few other parts
that share the 3.3V rail with the EC so 1mA or so
I made http://wiki.laptop.org/go/XO_Troubleshooting_Battery#Tips but you
folks can do a much better edit.
In q2e32 I've pulled in some of my batman.fth stuff.
I noted this in the same page's batman.fth section.
--
=S
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S Page wrote:
I made http://wiki.laptop.org/go/XO_Troubleshooting_Battery#Tips but you
folks can do a much better edit.
In q2e32 I've pulled in some of my batman.fth stuff.
I noted this in the same page's batman.fth section.
I don't see it.
In q2e32 i've changed the names of some of the
On 15 Feb 2009, at 05:36, Mikus Grinbergs wrote:
My apologies for not being clear. I'll try again:
I want to feel that the battery that I just put into the XO I'm
walking out the door with is as charged up as it normally can be.
1) If that battery came from an XO that was plugged into the
On Sun, Feb 15, 2009 at 6:36 PM, Mikus Grinbergs mi...@bga.com wrote:
I was under the impression that when the battery charge went
somewhere below about 97%, the XO would charge it some more.
So I was surprised to have it stay at 94%. [If 94% being shown on
the pop-up is not low enough for
On Sun, Feb 15, 2009 at 12:36:36AM -0500, Mikus Grinbergs wrote:
My apologies for not being clear. I'll try again:
I want to feel that the battery that I just put into the XO I'm
walking out the door with is as charged up as it normally can be.
1) If that battery came from an XO that
qu...@laptop.org wrote:
3) If that battery had been sitting on the shelf (not in an XO) for
a month -- what did I need to do to make it topped off ?
Discharge it to 90% capacity, then charge it.
q2e32 can help you out. In q2e32 I've pulled in some of my batman.fth
stuff.
As James
Chris Ball and Paul Fox responded:
I take this to mean that *something* was draining some power for
the two days the XO was sitting in its shut down state.
The embedded controller was. Something needs to be watching for a power
button press in order to know when to turn on.
Thank you. I
On Fri, Feb 13, 2009 at 8:38 PM, Chris Ball c...@laptop.org wrote:
Hi,
by default the wireless card remains alive to participate in a
potential mesh network, disabling wireless should give you a lot
more time.
You're thinking of sleep mode, not the full shutdown that Mikus is
da...@lang.hm wrote:
The embedded controller was. Something needs to be watching for a
power button press in order to know when to turn on.
by default the wireless card remains alive to participate in a
potential mesh network, disabling wireless should give you a lot more
time.
In power
Richard A. Smith wrote:
going into STOP mode the EC is only going into IDEL mode. In IDEL the
instruction fetch is turned off but the clocks and timers still run. 4mA
is listed as the nominal draw in that mode.
/s/IDEL/IDLE
--
Richard Smith rich...@laptop.org
One Laptop Per Child
Richard A. Smith wrote:
into STOP mode but its power draw suggests otherwise. I'll have to
study it deeper.
After deeper study I have verified that the EC is going into stop mode.
I have also found the (biggest) source of the additional power draw I
measured.
The tinder box XO has the
On Sat, Feb 14, 2009 at 01:56:22PM -0500, Mikus Grinbergs wrote:
I have found the XO-1 batteries (mfg by BYD Company Ltd) to be very
stingy with energy loss. When I put one back in after a month out
of the case, the XO software told me it was still 94% charged.
The displayed state of charge
This gets more and more bizarre !!
James wrote:
The displayed state of charge is stored in the chip in the battery, and
is maintained by the EC. The battery does not change it's own state of
charge value.
and
(If one discharges an XO battery outside the XO using a home lighting
On Sat, Feb 14, 2009 at 08:26:13PM -0500, Mikus Grinbergs wrote:
This gets more and more bizarre !!
No, it's just physics and chemistry, constrained by engineering.
Please, if you think it is bizarre, explain why you think so, and I'll
happily explain the physics that I know.
What I am now
My apologies for not being clear. I'll try again:
I want to feel that the battery that I just put into the XO I'm
walking out the door with is as charged up as it normally can be.
1) If that battery came from an XO that was plugged into the AC
24/7 for the past week -- I *think* it is
As far as I can tell, the battery in the XO-1 retains its charge
quite well when taken out of the case. But in my experience, when I
specify 'Shutdown' to the software, and close the XO lid after all
its lights (including 'power') are extinguished -- then when two
days later I insert the AC
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Mikus Grinbergs wrote:
I take this to mean that *something* was draining some
power for the two days the XO was sitting in its shut down state.
All rechargeable batteries lose stored energy over time. The phenomenon
is called self-discharge. It
Hi,
I take this to mean that *something* was draining some power for
the two days the XO was sitting in its shut down state.
The embedded controller was. Something needs to be watching for a power
button press in order to know when to turn on.
- Chris.
--
Chris Ball c...@laptop.org
On Fri, 13 Feb 2009, Chris Ball wrote:
Hi,
I take this to mean that *something* was draining some power for
the two days the XO was sitting in its shut down state.
The embedded controller was. Something needs to be watching for a power
button press in order to know when to turn on.
Long ago I did some early measurements of the EC and it was consuming
current while operating.
The operating current has varied slightly according to the firmware
version. There have been improvements, but I've not measured it
recently.
The symptom you describe is quite normal ... the battery
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