Re: [Platformx-sg2-devel] power measurements for SG2

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You can edit the /etc/modules file so that it does not load the pcmcia
drivers. The gpios that control the pcmcia are manages in one of those
drivers. From that file just remove
  pxa2xx_cs
  pcmcia
  ide-cs
  ide-disk
  hostap_cs

There are also module that drive the wired Ethernet chip, usb, and sd
(mmc) hardware in that file.

ed c.=20

-----Original Message-----
From: pla...@li...
[mailto:pla...@li...] On Behalf Of
ni...@cs...
Sent: Wednesday, October 04, 2006 10:25 AM
To: pla...@li...
Subject: Re: [Platformx-sg2-devel] power measurements for SG2

I tried it with a laptop. It does draw more power that I would expect
, around 150 mW, but nothing like 500 mW that it shows on the stargate.
However,
I can get around this problem by powering the mote separately rather
than the USB.

I want some help regarding the suspension/standby power of the stargate.
In a
mail, few weeks ago, you said you will help me debug why the stargate
was
pulling such a lot of power during suspension. From my experiments, I
could
figure out that the power supply to the CF card is not being cut off.
Will
just unloading the drivers cut the current supply *completely* to the
CF slot.

-Nilanjan

Quoting "Pering, Trevor" <tre...@in...>:

> Huh -- not really sure what to say.  Seems like the TelosB is doing
> something weird -- there is really nothing that the SG2 could/should
be
> able to do to cause this problem.  It's a very simple circuit, and the
> fact that it's fine with another USB device indicates that the HW is
ok.
>=20
> Have you measured the power of the TelosB platform with a different
USB
> master?  E.g., a laptop of some kind?
>=20
> Cheers,
> 	Trevor
>=20
>=20
> -----Original Message-----
> From: pla...@li...
> [mailto:pla...@li...] On Behalf
Of
> ni...@cs...
> Sent: Wednesday, September 27, 2006 3:14 PM
> To: pla...@li...
> Subject: Re: [Platformx-sg2-devel] power measurements for SG2
>=20
> Hi Trevor,
> Sorry for the late reply. I did what you asked. It seems like the
> problem only
> occurs with a tmote sky mote (and not with a SanDisk USB memory
stick).
> I have
> answered inline in detail using ---.
>=20
>=20
> Quoting "Pering, Trevor" <tre...@in...>:
>=20
> > Nilanjan, so -- you are saying that if the USBH interface *is*
powered
> > up, but that a USB dongle is NOT plugged in, that there is *no*
> leakage?
> > That is, under what conditions does the leakage occur?  When the
rail
> is
> > powered up?  When the USB dongle is plugged in? =20
>=20
> --- When the USBH *is* powered up but the TelosB is not plugged in,
> there
> is *no* leakage. The leakage only occurs with the mote is plugged in.
>=20
>=20
>=20
> > Also, can you try it with J12 removed -- this is the power for the
> > PCMCIA socket.  It just isolates it some, but I wouldn't expect it
to
> do
> > anything. =20
>=20
> -- Removing J12 doesnot help.
>=20
>=20
>=20
> > Oh, if you try the port with something else other than the TelosB,
> e.g.,
> > a memory stick -- do you see similar problems?  =20
>=20
>=20
> --- The problem doesnot occur with a memory stick. I used a 512 MB
> SanDisk
> USB memory stick in place of the TelosB and there was no leakage. The
> system
> drew around 350 mW of power (as expected).I tried different programs
on
> the=20
> TelosB , but the leakage still remained.
>=20
>=20
> > And, if you disable the software drivers (prevent the USB modules
from
> > being loaded), do you see the same effect?
>=20
>=20
> ---Unloading the  USB drivers didnot help.
>=20
>=20
> > Depending on what you find we might need/want to get Alex to poke at
> it
> > some, but we would need a very specific test case for him to
> isolate...
> >=20
> > Cheers,
> > 	Trevor
> >=20
>=20
>=20
>=20
>=20
>=20
>=20
> Thanks,
> Nilanjan
>=20
>=20
>=20
>=20
> > -----Original Message-----
> > From: Nilanjan Banerjee [mailto:ni...@cs...]=20
> > Sent: Wednesday, September 13, 2006 2:45 PM
> > To: Pering, Trevor
> > Cc: pla...@li...
> > Subject: RE: [Platformx-sg2-devel] power measurements for SG2
> >=20
> > I made a mistake in the last mail. It is actually the charge pump
mode
> > which has a larger leakage current. I got the pins 1 2 3 on J8 in
the=20
> > reverse direction. So my measurement on charge pump and "direct from
> > the battery" mode should be swapped.
> >=20
> > Indeed powering off the power by echo off > /proc/pmic/USBH makes
the
> > leakage goes away for the charge pump mode. I am using revision 2.2
> for=20
> > the mothercard.
> >=20
> > -Nilanjan
> >=20
> > On Wed, 13 Sep 2006, Pering, Trevor wrote:
> >=20
> > > Hmmm -- not sure where the power is going. You could try manually
> > > turning subsystems off one by one to see if it helps at all.  The
> > power
> > > rails are listed in /proc/pmic/VDD_* -- and if you do something
> like:
> > >
> > > echo off > /proc/pmic/VDD_CC2420
> > >
> > > it should turn power off to that rail.  There are some rails that
> you
> > > can't really turn off and still have a functional system.  E.g.,
> > VCC_IO.
> > > However, you can turn it off once and see how much it drops the
> power,
> > > but you'll need to power-cycle to get it working again.
> > >
> > > Also, if you turn the power off for the charge pump (USBH), does
the
> > > leakage go away?  This would be the obvious place and it would
> > indicate
> > > that there is some kind of leakage in that part of the system that
> we
> > > could look for... That power rail does go a few other places so it
> > > wouldn't be unreasonable.
> > >
> > > Just to verify, which version of the board do you have?  This
should
> > be
> > > something like 2.1 or 2.2, and would be written in the silk screen
> > > somewhere...
> > >
> > > Cheers,
> > > 	Trevor
> > >
> > >
> > > -----Original Message-----
> > > From: ni...@cs... [mailto:ni...@cs...]
> > > Sent: Wednesday, September 13, 2006 12:38 PM
> > > To: Pering, Trevor
> > > Cc: pla...@li...
> > > Subject: RE: [Platformx-sg2-devel] power measurements for SG2
> > >
> > > Hi,
> > > I was using the "direct from the battery" to power the USB.
> > > So I tried the charge pump too. So these are
> > > the power characteristics for the above two modes of
> > > powering the usb.
> > >
> > > 1. "direct from the battery" : Initially, for about 30
> > > seconds the power consumption rises to  1170 mW. It seems
> > > that for this period of time a process called "usb.agent" is
> > > using about 15% of the CPU. Once this process terminates
> > > the power consumption falls to about 780 mW. The mote
> > > alone from the usb draws 145 mW. (This is high but this
> > > is the amount that it draws independently from a laptop
> > > usb too. I will try to see why this is the case !!). So
> > > there is at least a leakage of about 360 mW somewhere else.
> > >
> > >
> > > 2. charge pump : Initially for about 30 seconds the
> > > power rises to 850 mW due to the process usb.agent, I guess.
> > > and then it falls to 490 mW. the mote again pulls around
> > > 145 mW. So there is a leakage of about 75 mW.
> > >
> > >
> > > What does this process usb.agent actually do ? It runs for a long
> > > time (30 seconds) and energy consumption during this time
> > > is high ? Can it be brought down ?
> > >
> > >
> > > For the suspension number of 98mW, I didnot use the daughter
> > > card, the usb , the CF or SD slot. However, I experimented
> > > today by attaching a mote to the USB and the Wifi card in
> > > the CF slot. None of the these subsystems are being
> > > turned off on suspension, and consequently on suspension, with the
> CF
> > > card and the mote attached the power consumption is around
> > > a watt.
> > >
> > >
> > > -Nilanjan
> > >
> > >
> > >
> > > Quoting "Pering, Trevor" <tre...@in...>:
> > >
> > >> Nilanjan, thanks for you questions.
> > >>
> > >> 1) short answer is I don't know, but you're right that it's very
> > >> strange. How are you powering the USB interface?  There are two
> > > options:
> > >> direct from the battery (high current, but lower voltage) or from
> the
> > >> on-board charge pump (5V, but limited current).  This is
controlled
> > by
> > >> jumper J8 on the board (which should be fairly near the USBH
> > > connector).
> > >>
> > >> You can try turning off the power, either by removing the jumper,
> or
> > > if
> > >> it's using the charge-pump by doing "echo off > /proc/pmic/USBH"
or
> > >> something like that -- just to see what's going on.
> > >>
> > >> Also, if nothing else comes up, it would be good/interesting to
> > > measure
> > >> the power consumption of the mote with a similar
resistor-in-series
> > >> trick just to see if that's indeed where the power is going...
> > >>
> > >> Maybe it's a software issue -- when you plug the telosB mote in,
is
> > >> there any process that's consuming a lot of CPU?  Does ps show
any
> > CPU
> > >> usage? Uptime?  I think there are/were some issues with the udev
> > >> filesystem that would cause it to consume a lot of CPU for a
short
> > > time.
> > >> How long does it run at 830mW for...?  Is it still like that 20
> > > minutes
> > >> later?  Actually, now that I think of it I think there is
something
> > to
> > >> this line, so maybe check it first.
> > >>
> > >> 2) Yah, I think your correct again in that I don't think we've
done
> > >> anything really to reduce the power consumption in sleep mode, so
> > > there
> > >> are probably a lot of peripherals that are still on.  Is this
with
> > the
> > >> DC plugged in?  I think the Ethernet interface probably consumes
a
> > lot
> > >> if so.  Otherwise, probably need to go through each subsystem and
> > > think
> > >> about what kind of low-power state they might be in...  Let me
know
> > > how
> > >> you want to proceed on this -- I could help you make a list of
all
> > the
> > >> subsystems and then we could discuss what might need to be done
for
> > > each
> > >> of them...
> > >>
> > >> Cheers,
> > >> 	Trevor
> > >>
> > >>
> > >> -----Original Message-----
> > >> From: pla...@li...
> > >> [mailto:pla...@li...] On
> Behalf
> > > Of
> > >> ni...@cs...
> > >> Sent: Tuesday, September 12, 2006 11:47 AM
> > >> To: pla...@li...
> > >> Subject: [Platformx-sg2-devel] power measurements for SG2
> > >>
> > >> Hi,
> > >> I did some power measurements for the stargate 2 platform.
> > >> I just used the mothercard for the measurements (no daughter
> > >> card). I attached a 1 ohm resistance in series with the mini usb
> > cable
> > >
> > >> and used a NI-DAQ to measure the voltage across the resistor
> > >> and subsequently the current and the power consumed by
> > >> the stargate.
> > >>
> > >> I have the following two questions in this regard.
> > >>
> > >> 1. The idle power of the platform (without any
> > >> CF or SD card ) is around 270 mW, which
> > >> seems reasonable. However, as soon as I plug in a Telosb
> > >> using the USB on the mothercard, the power consumption
> > >> rises to 830 mW. This seems like an odd jump, as the mote
> > >> alone doesnot draw more than 50 mW of power. I am using
> > >> the ftdi_sio driver and the stargate recognises the Telosb
> > >> correctly and is able to communicate with it.
> > >>
> > >>
> > >> 2. The standby/suspension power of the platform is around
> > >> 98 mW which is also kind of high, since I remember that
> > >> Stargate 1 with the daughter card removed pulled around
> > >> 35 mW of power. However, in this case, it might be a
> > >> possible software problem, like maybe unloading the proper
> > >> device drivers before suspension ?
> > >>
> > >>
> > >>
> > >>
> > >> -Nilanjan
> > >>
> > >>
> > >>
> > >> -------------------------------------------------
> > >> This mail sent through IMP: http://horde.org/imp/
> > >>
> > >>
> > >
> >
>
------------------------------------------------------------------------
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> > >> Using Tomcat but need to do more? Need to support web services,
> > >> security?
> > >> Get stuff done quickly with pre-integrated technology to make
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> > job
> > >> easier
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> > >> Geronimo
> > >>
> > >
> >
>
http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D=
121642
> > >> _______________________________________________
> > >> Platformx-sg2-devel mailing list
> > >> Pla...@li...
> > >> https://lists.sourceforge.net/lists/listinfo/platformx-sg2-devel
> > >>
> > >
> > >
> > >
> > >
> > > -------------------------------------------------
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> >=20
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