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Re: wifistix issue

Steve Sakoman
Craig,

After many debugging hours I've managed to witness a field unit crashing twice right in front of my eyes, with serial port connected and logging console messages.

The good news is that both crashes were quite consistent.  The bad news is that there were no console messages in either case :-(

My device has a web UI.  In each case the crash was triggered by my loading the default web ui page.  I was watching the yellow wifi led in both cases as I launched the page request.  Same result both times -- after a moment the led went out and a few seconds later the gumstix rebooted.

My normal test routine previously involved 3 pc's continuously reloading the web UI page.  This runs successfully forever on the bench and for 10 - 20 hours in the field.  I was lucky to catch the above 2 cases when I was loading the page manually with a single pc.

Looking back through the logs of serial console output from previous runs for more clues, I found a single instance of an error message just before a crash.  It was from mwlan0 and it said that there was a transmit timeout error.

Is there a way to enable a verbose or debug mode for the wifi driver?  The main difference between bench and field seems to be wifi signal quality.  Power supply is good -- I have a logging meter on the gumstix supply and it is as clean as one could hope for before each crash.

Thanks,

Steve


On 5/10/07, Craig Hughes <[hidden email]> wrote:
On May 10, 2007, at 7:52 AM, Steve Sakoman wrote:

> Craig,
>
> I attached a laptop with serial connection to one of the units last
> night in the hopes of being able to use a terminal session to see
> what is going wrong.
>
> The unit did fail overnight, but the serial connection proved to be
> of no use -- the system was wedged, no serial io :-(  And of course
> the console message file disappeared into the ether upon reboot.
>
> The same bits have been running on another unit on my bench for
> more than two weeks without reboot, so I'm off to eliminate
> variables one by one.  I swapped the bench and field units after
> the failure last night.  The gods were with me and the swapped unit
> failed this morning in the same way, so that eliminates it being
> related to a particular unit and points to something in the
> environment (power supply, EMI, wifi signal strength,
> temperature,  . . .)
>
> These intermittent failures are lots of fun :-)

Hmm.  How about mounting /var/log from an MMC or CF or NFS location?
As an alternative, use the watchdog driver to just restart if the
system hangs.

C



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Re: wifistix issue

Craig Hughes
Steve,

yes there's some debugging I can turn on in the wifi driver -- which kernel revision are you building against, and do you have RT stuff enabled or not?  I'll build you a debug wifi driver against your kernel version and send it.

C

On May 14, 2007, at 11:50 AM, Steve Sakoman wrote:

Craig,

After many debugging hours I've managed to witness a field unit crashing twice right in front of my eyes, with serial port connected and logging console messages.

The good news is that both crashes were quite consistent.  The bad news is that there were no console messages in either case :-(

My device has a web UI.  In each case the crash was triggered by my loading the default web ui page.  I was watching the yellow wifi led in both cases as I launched the page request.  Same result both times -- after a moment the led went out and a few seconds later the gumstix rebooted.

My normal test routine previously involved 3 pc's continuously reloading the web UI page.  This runs successfully forever on the bench and for 10 - 20 hours in the field.  I was lucky to catch the above 2 cases when I was loading the page manually with a single pc.

Looking back through the logs of serial console output from previous runs for more clues, I found a single instance of an error message just before a crash.  It was from mwlan0 and it said that there was a transmit timeout error.

Is there a way to enable a verbose or debug mode for the wifi driver?  The main difference between bench and field seems to be wifi signal quality.  Power supply is good -- I have a logging meter on the gumstix supply and it is as clean as one could hope for before each crash.

Thanks,

Steve


On 5/10/07, Craig Hughes <[hidden email]> wrote:
On May 10, 2007, at 7:52 AM, Steve Sakoman wrote:

> Craig,
>
> I attached a laptop with serial connection to one of the units last
> night in the hopes of being able to use a terminal session to see
> what is going wrong.
>
> The unit did fail overnight, but the serial connection proved to be
> of no use -- the system was wedged, no serial io :-(  And of course
> the console message file disappeared into the ether upon reboot.
>
> The same bits have been running on another unit on my bench for
> more than two weeks without reboot, so I'm off to eliminate
> variables one by one.  I swapped the bench and field units after
> the failure last night.  The gods were with me and the swapped unit
> failed this morning in the same way, so that eliminates it being
> related to a particular unit and points to something in the
> environment (power supply, EMI, wifi signal strength,
> temperature,  . . .)
>
> These intermittent failures are lots of fun :-)

Hmm.  How about mounting /var/log from an MMC or CF or NFS location?
As an alternative, use the watchdog driver to just restart if the
system hangs.

C



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Re: wifistix issue

Dave Hylands
In reply to this post by Steve Sakoman
Hi Steve,

> After many debugging hours I've managed to witness a field unit crashing
> twice right in front of my eyes, with serial port connected and logging
> console messages.
>
> The good news is that both crashes were quite consistent.  The bad news is
> that there were no console messages in either case :-(
>
> My device has a web UI.  In each case the crash was triggered by my loading
> the default web ui page.  I was watching the yellow wifi led in both cases
> as I launched the page request.  Same result both times -- after a moment
> the led went out and a few seconds later the gumstix rebooted.

I've experienced similar problem with other products.

Wifi seems to draw ALOT of power.

Since it seems to be happening during a page reload, this is when
power consumption will be at its max (Tx and Rx occuring). What could
be happening is that some voltage regulator is going into shutdown
(either thermal or current limit).

How are you providing power to the board?

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Re: wifistix issue

Steve Sakoman
In reply to this post by Craig Hughes
Craig,

Thanks!  /etc/gumstix-release tells me I'm using 1176M.  I've never enabled the RT stuff.

Steve



On 5/14/07, Craig Hughes <[hidden email]> wrote:
Steve,

yes there's some debugging I can turn on in the wifi driver -- which kernel revision are you building against, and do you have RT stuff enabled or not?  I'll build you a debug wifi driver against your kernel version and send it.

C

On May 14, 2007, at 11:50 AM, Steve Sakoman wrote:

Craig,

After many debugging hours I've managed to witness a field unit crashing twice right in front of my eyes, with serial port connected and logging console messages.

The good news is that both crashes were quite consistent.  The bad news is that there were no console messages in either case :-(

My device has a web UI.  In each case the crash was triggered by my loading the default web ui page.  I was watching the yellow wifi led in both cases as I launched the page request.  Same result both times -- after a moment the led went out and a few seconds later the gumstix rebooted.

My normal test routine previously involved 3 pc's continuously reloading the web UI page.  This runs successfully forever on the bench and for 10 - 20 hours in the field.  I was lucky to catch the above 2 cases when I was loading the page manually with a single pc.

Looking back through the logs of serial console output from previous runs for more clues, I found a single instance of an error message just before a crash.  It was from mwlan0 and it said that there was a transmit timeout error.

Is there a way to enable a verbose or debug mode for the wifi driver?  The main difference between bench and field seems to be wifi signal quality.  Power supply is good -- I have a logging meter on the gumstix supply and it is as clean as one could hope for before each crash.

Thanks,

Steve


On 5/10/07, Craig Hughes <[hidden email]> wrote:
On May 10, 2007, at 7:52 AM, Steve Sakoman wrote:

> Craig,
>
> I attached a laptop with serial connection to one of the units last
> night in the hopes of being able to use a terminal session to see
> what is going wrong.
>
> The unit did fail overnight, but the serial connection proved to be
> of no use -- the system was wedged, no serial io :-(  And of course
> the console message file disappeared into the ether upon reboot.
>
> The same bits have been running on another unit on my bench for
> more than two weeks without reboot, so I'm off to eliminate
> variables one by one.  I swapped the bench and field units after
> the failure last night.  The gods were with me and the swapped unit
> failed this morning in the same way, so that eliminates it being
> related to a particular unit and points to something in the
> environment (power supply, EMI, wifi signal strength,
> temperature,  . . .)
>
> These intermittent failures are lots of fun :-)

Hmm.  How about mounting /var/log from an MMC or CF or NFS location?
As an alternative, use the watchdog driver to just restart if the
system hangs.

C



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Re: wifistix issue

Steve Sakoman
In reply to this post by Dave Hylands
>What could be happening is that some voltage regulator is going into shutdown
>(either thermal or current limit).

That was my initial theory too.

My device is an energy monitor for solar installations and is powered by the solar battery bank (2200 amp hours @ 24V nominal in this case).  Vbatt (5V) is generated from a switching supply off the battery.  I've tested the switcher with inputs up to 76V (and down to 8V) and temperatures up to 150F.  Solid as a rock.  The switcher can provide 1 amp continuous, my device uses about a quarter of that.

Nonetheless I still wanted to make sure that this wasn't the issue in the field installation.  I put my Fluke Scopemeter in logging mode and connected it to the Vbatt supply on the wifistix.  During the 24 hour period I monitored, the voltage only varied from 4.96V to 5.05V.

Temperatures at the installation site (also logged) have varied from 50F to 103F during the past week.  Crashes show no correlation with temperature.

The crashes also don't seem to correlate with network load.  The unit has handled non-stop hammering from 3 pc's for 20 hours and then failed on a single page load 2 minutes after a cold boot.

I suppose I could connect the field unit to a bench supply to totally rule out the supply as an issue . . .

Steve



On 5/14/07, Dave Hylands <[hidden email]> wrote:
Hi Steve,

> After many debugging hours I've managed to witness a field unit crashing
> twice right in front of my eyes, with serial port connected and logging
> console messages.
>
> The good news is that both crashes were quite consistent.  The bad news is
> that there were no console messages in either case :-(
>
> My device has a web UI.  In each case the crash was triggered by my loading
> the default web ui page.  I was watching the yellow wifi led in both cases
> as I launched the page request.  Same result both times -- after a moment
> the led went out and a few seconds later the gumstix rebooted.

I've experienced similar problem with other products.

Wifi seems to draw ALOT of power.

Since it seems to be happening during a page reload, this is when
power consumption will be at its max (Tx and Rx occuring). What could
be happening is that some voltage regulator is going into shutdown
(either thermal or current limit).

How are you providing power to the board?

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Re: wifistix issue

Dave Hylands
Hi Steve,

> I suppose I could connect the field unit to a bench supply to totally rule
> out the supply as an issue . . .

I think that would be wise. The particular product I was working with
was a DPAC Airborne wireless module, and while it only drew about 1/2
amp as measured by my multimeter, it could draw as much as 2A
instantaneous current. Trying to deal with the instantaneous current
supply was causing the DPAC unit to reset itself.

The DPAC unit would work flawlessly off my bench supply and I never
could get the switching regulators I had on hand to work with it.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Re: wifistix issue

Steve Sakoman
Dave,

All my bench testing has used the switcher.  The only difference is that the bench test uses a bench supply as the input to the switcher (25V @ 2A max) whereas the field units are connected to a battery bank (25V @ 2000A max :-)  So theoretically the switcher shouldn't be the issue.

Nonetheless, I now have the field unit powered by the same supply I used on the bench, same cable too :-)  One can't be too anal in removing variables when tracking these things down!

Steve


On 5/14/07, Dave Hylands <[hidden email]> wrote:
Hi Steve,

> I suppose I could connect the field unit to a bench supply to totally rule
> out the supply as an issue . . .

I think that would be wise. The particular product I was working with
was a DPAC Airborne wireless module, and while it only drew about 1/2
amp as measured by my multimeter, it could draw as much as 2A
instantaneous current. Trying to deal with the instantaneous current
supply was causing the DPAC unit to reset itself.

The DPAC unit would work flawlessly off my bench supply and I never
could get the switching regulators I had on hand to work with it.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Re: wifistix issue

Steve Sakoman
Wow, talk about luck (?)  I had an immediate failure on the first page load after rebooting with the bench supply (guess that removes that variable).

For a second time the serial port caught an error message:

NETDEV WATCHDOG: mwlan0: transmit timed out

Then the yellow led went out and the gumstix rebooted.

Perhaps that debug wifi driver might help catch more info.

Steve

On 5/14/07, Steve Sakoman <[hidden email]> wrote:
Dave,

All my bench testing has used the switcher.  The only difference is that the bench test uses a bench supply as the input to the switcher (25V @ 2A max) whereas the field units are connected to a battery bank (25V @ 2000A max :-)  So theoretically the switcher shouldn't be the issue.

Nonetheless, I now have the field unit powered by the same supply I used on the bench, same cable too :-)  One can't be too anal in removing variables when tracking these things down!

Steve


On 5/14/07, Dave Hylands <[hidden email]> wrote:
Hi Steve,

> I suppose I could connect the field unit to a bench supply to totally rule
> out the supply as an issue . . .

I think that would be wise. The particular product I was working with
was a DPAC Airborne wireless module, and while it only drew about 1/2
amp as measured by my multimeter, it could draw as much as 2A
instantaneous current. Trying to deal with the instantaneous current
supply was causing the DPAC unit to reset itself.

The DPAC unit would work flawlessly off my bench supply and I never
could get the switching regulators I had on hand to work with it.

--
Dave Hylands
Vancouver, BC, Canada
<a href="http://www.DaveHylands.com/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> http://www.DaveHylands.com/

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Re: wifistix issue

Drew Folta
In reply to this post by Steve Sakoman
Total shot-in-the-dark, and probably not worth trying unless it's
easy, but what about dewpoint?  Is condensation an issue?  (I don't
know much about environmental effects on electronics.)

Drew


On 5/14/07, Steve Sakoman <[hidden email]> wrote:
>
> Temperatures at the installation site (also logged) have varied from 50F to
> 103F during the past week.  Crashes show no correlation with temperature.
>

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Re: wifistix issue

Steve Sakoman
Drew,

Good thought, but the weather has been bone dry.  Today it's 100F in the equipment area with a RH of about 10%.  I'm in shorts & t-shirt and the sweat is evaporating as fast as it comes out :-)

I am beginning to suspect thermal shutdown on a linear regulator.  As the temperature has climbed I am seeing the problem with greater regularity.  I need to get back to my office to look at the gumstix schematics to find places to probe the 3.3V supplies.

Thanks for helping with the brainstorming!

Steve


On 5/14/07, Drew Folta <[hidden email]> wrote:
Total shot-in-the-dark, and probably not worth trying unless it's
easy, but what about dewpoint?  Is condensation an issue?  (I don't
know much about environmental effects on electronics.)

Drew


On 5/14/07, Steve Sakoman <[hidden email]> wrote:
>
> Temperatures at the installation site (also logged) have varied from 50F to
> 103F during the past week.  Crashes show no correlation with temperature.
>

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Re: wifistix issue

Craig Hughes
On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:

> Drew,
>
> Good thought, but the weather has been bone dry.  Today it's 100F  
> in the equipment area with a RH of about 10%.  I'm in shorts & t-
> shirt and the sweat is evaporating as fast as it comes out :-)
>
> I am beginning to suspect thermal shutdown on a linear regulator.  
> As the temperature has climbed I am seeing the problem with greater  
> regularity.  I need to get back to my office to look at the gumstix  
> schematics to find places to probe the 3.3V supplies.
>
> Thanks for helping with the brainstorming!

If the on-gumstix regulator(s) are shutting down, try lowering the  
v_batt supply to 4V if you can from 5V.

C




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Re: wifistix issue

Steve Sakoman
>If the on-gumstix regulator(s) are shutting down, try lowering the
>v_batt supply to 4V if you can from 5V.

I scoped the wifistix 3.3V output.  It was a steady 3.3V before during and after the crash/reboot.  Same transmit timeout error again this time.

I measured the case temp of the regulator on the wifistix (U$5).  It was 119F.  If I recall correctly,  this is in spec for that part.

I also measured the case temp of the wifi module.  It was 140F.  Is this in spec for the module?

The ambient temp is 103F, which should be in spec for all of the gumstix components, right?

Steve

On 5/14/07, Craig Hughes <[hidden email]> wrote:
On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:

> Drew,
>
> Good thought, but the weather has been bone dry.  Today it's 100F
> in the equipment area with a RH of about 10%.  I'm in shorts & t-
> shirt and the sweat is evaporating as fast as it comes out :-)
>
> I am beginning to suspect thermal shutdown on a linear regulator.
> As the temperature has climbed I am seeing the problem with greater
> regularity.  I need to get back to my office to look at the gumstix
> schematics to find places to probe the 3.3V supplies.
>
> Thanks for helping with the brainstorming!

If the on-gumstix regulator(s) are shutting down, try lowering the
v_batt supply to 4V if you can from 5V.

C




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Re: wifistix issue

Jeff Sadowski
3.3V is low maybe you should up it a little.

On 5/14/07, Steve Sakoman <[hidden email]> wrote:

> >If the on-gumstix regulator(s) are shutting down, try lowering the
> >v_batt supply to 4V if you can from 5V.
>
> I scoped the wifistix 3.3V output.  It was a steady 3.3V before during and
> after the crash/reboot.  Same transmit timeout error again this time.
>
> I measured the case temp of the regulator on the wifistix (U$5).  It was
> 119F.  If I recall correctly,  this is in spec for that part.
>
> I also measured the case temp of the wifi module.  It was 140F.  Is this in
> spec for the module?
>
> The ambient temp is 103F, which should be in spec for all of the gumstix
> components, right?
>
> Steve
>
>
> On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> >
> > > Drew,
> > >
> > > Good thought, but the weather has been bone dry.  Today it's 100F
> > > in the equipment area with a RH of about 10%.  I'm in shorts & t-
> > > shirt and the sweat is evaporating as fast as it comes out :-)
> > >
> > > I am beginning to suspect thermal shutdown on a linear regulator.
> > > As the temperature has climbed I am seeing the problem with greater
> > > regularity.  I need to get back to my office to look at the gumstix
> > > schematics to find places to probe the 3.3V supplies.
> > >
> > > Thanks for helping with the brainstorming!
> >
> > If the on-gumstix regulator(s) are shutting down, try lowering the
> > v_batt supply to 4V if you can from 5V.
> >
> > C
> >
> >
> >
> >
> >
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> > control of your XML. No limits. Just data. Click to get it now.
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> >
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> >
>
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Re: wifistix issue

Steve Sakoman
Jeff,

>3.3V is low maybe you should up it a little.

Perhaps it's the heat, but I'm confused by your comment!

The wifistix has a 3.3V fixed linear regulator on board.  I was measuring the output of this regulator in order to make sure the thermal shutdown feature of the linear regulator was not kicking in and causing the issues I am experiencing.   A 3.3V reading is expected on the output of this regulator, and anything significantly different would be cause for concern.  I was happy to see that the regulator was not going into thermal shutdown.  Also, since this is a fixed voltage regulator it is not possible to change the output voltage from 3.3V.

If I am misunderstanding your suggestion, please let me know where I'm going wrong!

Steve

On 5/14/07, Jeff Sadowski <[hidden email]> wrote:
3.3V is low maybe you should up it a little.

On 5/14/07, Steve Sakoman <[hidden email]> wrote:

> >If the on-gumstix regulator(s) are shutting down, try lowering the
> >v_batt supply to 4V if you can from 5V.
>
> I scoped the wifistix 3.3V output.  It was a steady 3.3V before during and
> after the crash/reboot.  Same transmit timeout error again this time.
>
> I measured the case temp of the regulator on the wifistix (U$5).  It was
> 119F.  If I recall correctly,  this is in spec for that part.
>
> I also measured the case temp of the wifi module.  It was 140F.  Is this in
> spec for the module?
>
> The ambient temp is 103F, which should be in spec for all of the gumstix
> components, right?
>
> Steve
>
>
> On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> >
> > > Drew,
> > >
> > > Good thought, but the weather has been bone dry.  Today it's 100F
> > > in the equipment area with a RH of about 10%.  I'm in shorts & t-
> > > shirt and the sweat is evaporating as fast as it comes out :-)
> > >
> > > I am beginning to suspect thermal shutdown on a linear regulator.
> > > As the temperature has climbed I am seeing the problem with greater
> > > regularity.  I need to get back to my office to look at the gumstix
> > > schematics to find places to probe the 3.3V supplies.
> > >
> > > Thanks for helping with the brainstorming!
> >
> > If the on-gumstix regulator(s) are shutting down, try lowering the
> > v_batt supply to 4V if you can from 5V.
> >
> > C
> >
> >
> >
> >
> >
> -------------------------------------------------------------------------
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> > Download DB2 Express C - the FREE version of DB2 express and take
> > control of your XML. No limits. Just data. Click to get it now.
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> >
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> >
>
>
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>

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Re: wifistix issue

yauh-gumstix
In reply to this post by Steve Sakoman
Not sure if this helps, but another datapoint is I have seen
this behavior with a CFstix and Linksys CF11 WiFicard. It would
workfine for low traffic but as soon as I do anything like stream
audio, the gumstix would crash/reset in a very similar manner. The
regulator did not feel warm and I have tried bringing down the
voltage.

-- Hunyue

>
> Jeff,
>
> >3.3V is low maybe you should up it a little.
>
> Perhaps it's the heat, but I'm confused by your comment!
>
> The wifistix has a 3.3V fixed linear regulator on board.  I was measuring
> the output of this regulator in order to make sure the thermal shutdown
> feature of the linear regulator was not kicking in and causing the issues I
> am experiencing.   A 3.3V reading is expected on the output of this
> regulator, and anything significantly different would be cause for concern.
> I was happy to see that the regulator was not going into thermal shutdown.
> Also, since this is a fixed voltage regulator it is not possible to change
> the output voltage from 3.3V.
>
> If I am misunderstanding your suggestion, please let me know where I'm going
> wrong!
>
> Steve
>
> On 5/14/07, Jeff Sadowski <[hidden email]> wrote:
> >
> > 3.3V is low maybe you should up it a little.
> >
> > On 5/14/07, Steve Sakoman <[hidden email]> wrote:
> > > >If the on-gumstix regulator(s) are shutting down, try lowering the
> > > >v_batt supply to 4V if you can from 5V.
> > >
> > > I scoped the wifistix 3.3V output.  It was a steady 3.3V before during
> > and
> > > after the crash/reboot.  Same transmit timeout error again this time.
> > >
> > > I measured the case temp of the regulator on the wifistix (U$5).  It was
> > > 119F.  If I recall correctly,  this is in spec for that part.
> > >
> > > I also measured the case temp of the wifi module.  It was 140F.  Is this
> > in
> > > spec for the module?
> > >
> > > The ambient temp is 103F, which should be in spec for all of the gumstix
> > > components, right?
> > >
> > > Steve
> > >
> > >
> > > On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > > > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> > > >
> > > > > Drew,
> > > > >
> > > > > Good thought, but the weather has been bone dry.  Today it's 100F
> > > > > in the equipment area with a RH of about 10%.  I'm in shorts & t-
> > > > > shirt and the sweat is evaporating as fast as it comes out :-)
> > > > >
> > > > > I am beginning to suspect thermal shutdown on a linear regulator.
> > > > > As the temperature has climbed I am seeing the problem with greater
> > > > > regularity.  I need to get back to my office to look at the gumstix
> > > > > schematics to find places to probe the 3.3V supplies.
> > > > >
> > > > > Thanks for helping with the brainstorming!
> > > >
> > > > If the on-gumstix regulator(s) are shutting down, try lowering the
> > > > v_batt supply to 4V if you can from 5V.
> > > >
> > > > C
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > -------------------------------------------------------------------------
> > > > This SF.net email is sponsored by DB2 Express
> > > > Download DB2 Express C - the FREE version of DB2 express and take
> > > > control of your XML. No limits. Just data. Click to get it now.
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> > > > gumstix-users mailing list
> > > > [hidden email]
> > > >
> > > https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > >
> > >
> > >
> > >
> > -------------------------------------------------------------------------
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> > >
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> >
>
> ------=_Part_73904_450632.1179185473500
> Content-Type: text/html; charset=ISO-8859-1
> Content-Transfer-Encoding: 7bit
> Content-Disposition: inline
>
> Jeff,<br><br>&gt;3.3V is low maybe you should up it a little.<br><br>Perhaps it&#39;s the heat, but I&#39;m confused by your comment!<br><br>The wifistix has a 3.3V fixed linear regulator on board.&nbsp; I was measuring the output of this regulator in order to make sure the thermal shutdown feature of the linear regulator was not kicking in and causing the issues I am experiencing.&nbsp;&nbsp; A
> 3.3V reading is expected on the output of this regulator, and anything significantly different would be cause for concern.&nbsp; I was happy to see that the regulator was not going into thermal shutdown.&nbsp; Also, since this is a fixed voltage regulator it is not possible to change the output voltage from
> 3.3V.<br><br>If I am misunderstanding your suggestion, please let me know where I&#39;m going wrong!<br><br>Steve<br><br><div><span class="gmail_quote">On 5/14/07, <b class="gmail_sendername">Jeff Sadowski</b> &lt;<a href="mailto:[hidden email]">
> [hidden email]</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">3.3V is low maybe you should up it a little.<br>
> <br>On 5/14/07, Steve Sakoman &lt;<a href="mailto:[hidden email]">[hidden email]</a>&gt; wrote:<br>&gt; &gt;If the on-gumstix regulator(s) are shutting down, try lowering the<br>&gt; &gt;v_batt supply to 4V if you can from 5V.
> <br>&gt;<br>&gt; I scoped the wifistix 3.3V output.&nbsp;&nbsp;It was a steady 3.3V before during and<br>&gt; after the crash/reboot.&nbsp;&nbsp;Same transmit timeout error again this time.<br>&gt;<br>&gt; I measured the case temp of the regulator on the wifistix (U$5).&nbsp;&nbsp;It was
> <br>&gt; 119F.&nbsp;&nbsp;If I recall correctly,&nbsp;&nbsp;this is in spec for that part.<br>&gt;<br>&gt; I also measured the case temp of the wifi module.&nbsp;&nbsp;It was 140F.&nbsp;&nbsp;Is this in<br>&gt; spec for the module?<br>&gt;<br>&gt; The ambient temp is 103F, which should be in spec for all of the gumstix
> <br>&gt; components, right?<br>&gt;<br>&gt; Steve<br>&gt;<br>&gt;<br>&gt; On 5/14/07, Craig Hughes &lt; <a href="mailto:[hidden email]">[hidden email]</a>&gt; wrote:<br>&gt; &gt; On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> <br>&gt; &gt;<br>&gt; &gt; &gt; Drew,<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; Good thought, but the weather has been bone dry.&nbsp;&nbsp;Today it&#39;s 100F<br>&gt; &gt; &gt; in the equipment area with a RH of about 10%.&nbsp;&nbsp;I&#39;m in shorts &amp; t-
> <br>&gt; &gt; &gt; shirt and the sweat is evaporating as fast as it comes out :-)<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; I am beginning to suspect thermal shutdown on a linear regulator.<br>&gt; &gt; &gt; As the temperature has climbed I am seeing the problem with greater
> <br>&gt; &gt; &gt; regularity.&nbsp;&nbsp;I need to get back to my office to look at the gumstix<br>&gt; &gt; &gt; schematics to find places to probe the 3.3V supplies.<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; Thanks for helping with the brainstorming!
> <br>&gt; &gt;<br>&gt; &gt; If the on-gumstix regulator(s) are shutting down, try lowering the<br>&gt; &gt; v_batt supply to 4V if you can from 5V.<br>&gt; &gt;<br>&gt; &gt; C<br>&gt; &gt;<br>&gt; &gt;<br>&gt; &gt;<br>&gt; &gt;
> <br>&gt; &gt;<br>&gt; -------------------------------------------------------------------------<br>&gt; &gt; This SF.net email is sponsored by DB2 Express<br>&gt; &gt; Download DB2 Express C - the FREE version of DB2 express and take
> <br>&gt; &gt; control of your XML. No limits. Just data. Click to get it now.<br>&gt; &gt; <a href="http://sourceforge.net/powerbar/db2/">http://sourceforge.net/powerbar/db2/</a><br>&gt; &gt; _______________________________________________
> <br>&gt; &gt; gumstix-users mailing list<br>&gt; &gt; <a href="mailto:[hidden email]">[hidden email]</a><br>&gt; &gt;<br>&gt; <a href="https://lists.sourceforge.net/lists/listinfo/gumstix-users">
> https://lists.sourceforge.net/lists/listinfo/gumstix-users</a><br>&gt; &gt;<br>&gt;<br>&gt;<br>&gt; -------------------------------------------------------------------------<br>&gt; This SF.net email is sponsored by DB2 Express
> <br>&gt; Download DB2 Express C - the FREE version of DB2 express and take<br>&gt; control of your XML. No limits. Just data. Click to get it now.<br>&gt; <a href="http://sourceforge.net/powerbar/db2/">http://sourceforge.net/powerbar/db2/
> </a><br>&gt; _______________________________________________<br>&gt; gumstix-users mailing list<br>&gt; <a href="mailto:[hidden email]">[hidden email]</a><br>&gt; <a href="https://lists.sourceforge.net/lists/listinfo/gumstix-users">
> https://lists.sourceforge.net/lists/listinfo/gumstix-users</a><br>&gt;<br>&gt;<br><br>-------------------------------------------------------------------------<br>This SF.net email is sponsored by DB2 Express<br>Download DB2 Express C - the FREE version of DB2 express and take
> <br>control of your XML. No limits. Just data. Click to get it now.<br><a href="http://sourceforge.net/powerbar/db2/">http://sourceforge.net/powerbar/db2/</a><br>_______________________________________________<br>gumstix-users mailing list
> <br><a href="mailto:[hidden email]">[hidden email]</a><br><a href="https://lists.sourceforge.net/lists/listinfo/gumstix-users">https://lists.sourceforge.net/lists/listinfo/gumstix-users
> </a><br></blockquote></div><br>
>
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>
>
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Re: wifistix issue

Jeff Sadowski
In reply to this post by Steve Sakoman
Misunderstanding I thought you where measuring the input voltage.

On 5/14/07, Steve Sakoman <[hidden email]> wrote:

> Jeff,
>
> >3.3V is low maybe you should up it a little.
>
> Perhaps it's the heat, but I'm confused by your comment!
>
> The wifistix has a 3.3V fixed linear regulator on board.  I was measuring
> the output of this regulator in order to make sure the thermal shutdown
> feature of the linear regulator was not kicking in and causing the issues I
> am experiencing.   A 3.3V reading is expected on the output of this
> regulator, and anything significantly different would be cause for concern.
> I was happy to see that the regulator was not going into thermal shutdown.
> Also, since this is a fixed voltage regulator it is not possible to change
> the output voltage from 3.3V.
>
> If I am misunderstanding your suggestion, please let me know where I'm going
> wrong!
>
> Steve
>
>
> On 5/14/07, Jeff Sadowski < [hidden email]> wrote:
> > 3.3V is low maybe you should up it a little.
> >
> > On 5/14/07, Steve Sakoman <[hidden email]> wrote:
> > > >If the on-gumstix regulator(s) are shutting down, try lowering the
> > > >v_batt supply to 4V if you can from 5V.
> > >
> > > I scoped the wifistix 3.3V output.  It was a steady 3.3V before during
> and
> > > after the crash/reboot.  Same transmit timeout error again this time.
> > >
> > > I measured the case temp of the regulator on the wifistix (U$5).  It was
> > > 119F.  If I recall correctly,  this is in spec for that part.
> > >
> > > I also measured the case temp of the wifi module.  It was 140F.  Is this
> in
> > > spec for the module?
> > >
> > > The ambient temp is 103F, which should be in spec for all of the gumstix
> > > components, right?
> > >
> > > Steve
> > >
> > >
> > > On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > > > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> > > >
> > > > > Drew,
> > > > >
> > > > > Good thought, but the weather has been bone dry.  Today it's 100F
> > > > > in the equipment area with a RH of about 10%.  I'm in shorts & t-
> > > > > shirt and the sweat is evaporating as fast as it comes out :-)
> > > > >
> > > > > I am beginning to suspect thermal shutdown on a linear regulator.
> > > > > As the temperature has climbed I am seeing the problem with greater
> > > > > regularity.  I need to get back to my office to look at the gumstix
> > > > > schematics to find places to probe the 3.3V supplies.
> > > > >
> > > > > Thanks for helping with the brainstorming!
> > > >
> > > > If the on-gumstix regulator(s) are shutting down, try lowering the
> > > > v_batt supply to 4V if you can from 5V.
> > > >
> > > > C
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> -------------------------------------------------------------------------
> > > > This SF.net email is sponsored by DB2 Express
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> > > > control of your XML. No limits. Just data. Click to get it now.
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> > > > [hidden email]
> > > >
> > >
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > >
> > >
> > >
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Re: wifistix issue

Steve Sakoman
In reply to this post by yauh-gumstix
Hunyue,

I'm fairly convinced that this is a temperature related problem.  I brought a second unit out to the field that was operating continuously on my bench without problem for the last couple of weeks.  I ran it off the same bench supply and cables that I used on the bench.  It failed within a half hour, and then repeatedly within seconds after a reboot after that first failure.  The ambient temperature was over 100F.

I returned the unit & power supply to my bench (72F ambient) and it has been working without problem for the past hour.  Not proof yet, but time will tell.

Steve

On 5/14/07, [hidden email] <[hidden email]> wrote:
Not sure if this helps, but another datapoint is I have seen
this behavior with a CFstix and Linksys CF11 WiFicard. It would
workfine for low traffic but as soon as I do anything like stream
audio, the gumstix would crash/reset in a very similar manner. The
regulator did not feel warm and I have tried bringing down the
voltage.

-- Hunyue

>
> Jeff,
>
> >3.3V is low maybe you should up it a little.
>
> Perhaps it's the heat, but I'm confused by your comment!
>
> The wifistix has a 3.3V fixed linear regulator on board.  I was measuring
> the output of this regulator in order to make sure the thermal shutdown
> feature of the linear regulator was not kicking in and causing the issues I
> am experiencing.   A 3.3V reading is expected on the output of this
> regulator, and anything significantly different would be cause for concern.
> I was happy to see that the regulator was not going into thermal shutdown.
> Also, since this is a fixed voltage regulator it is not possible to change
> the output voltage from 3.3V.
>
> If I am misunderstanding your suggestion, please let me know where I'm going
> wrong!

>
> Steve
>
> On 5/14/07, Jeff Sadowski <[hidden email]> wrote:
> >
> > 3.3V is low maybe you should up it a little.
> >
> > On 5/14/07, Steve Sakoman <[hidden email]> wrote:
> > > >If the on-gumstix regulator(s) are shutting down, try lowering the
> > > >v_batt supply to 4V if you can from 5V.
> > >
> > > I scoped the wifistix 3.3V output.  It was a steady 3.3V before during
> > and
> > > after the crash/reboot.  Same transmit timeout error again this time.
> > >
> > > I measured the case temp of the regulator on the wifistix (U$5).  It was
> > > 119F.  If I recall correctly,  this is in spec for that part.
> > >
> > > I also measured the case temp of the wifi module.  It was 140F.  Is this
> > in
> > > spec for the module?
> > >
> > > The ambient temp is 103F, which should be in spec for all of the gumstix
> > > components, right?
> > >
> > > Steve

> > >
> > >
> > > On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > > > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> > > >
> > > > > Drew,
> > > > >
> > > > > Good thought, but the weather has been bone dry.  Today it's 100F
> > > > > in the equipment area with a RH of about 10%.  I'm in shorts & t-
> > > > > shirt and the sweat is evaporating as fast as it comes out :-)
> > > > >
> > > > > I am beginning to suspect thermal shutdown on a linear regulator.
> > > > > As the temperature has climbed I am seeing the problem with greater
> > > > > regularity.  I need to get back to my office to look at the gumstix
> > > > > schematics to find places to probe the 3.3V supplies.
> > > > >
> > > > > Thanks for helping with the brainstorming!
> > > >
> > > > If the on-gumstix regulator(s) are shutting down, try lowering the
> > > > v_batt supply to 4V if you can from 5V.
> > > >
> > > > C
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > -------------------------------------------------------------------------
> > > > This SF.net email is sponsored by DB2 Express

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> > > > control of your XML. No limits. Just data. Click to get it now.
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> > > > gumstix-users mailing list
> > > > [hidden email]
> > > >
> > > https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > >
> > >
> > >
> > >
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> >
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>
> Jeff,<br><br>&gt;3.3V is low maybe you should up it a little.<br><br>Perhaps it&#39;s the heat, but I&#39;m confused by your comment!<br><br>The wifistix has a 3.3V fixed linear regulator on board.&nbsp; I was measuring the output of this regulator in order to make sure the thermal shutdown feature of the linear regulator was not kicking in and causing the issues I am experiencing.&nbsp;&nbsp; A
> 3.3V reading is expected on the output of this regulator, and anything significantly different would be cause for concern.&nbsp; I was happy to see that the regulator was not going into thermal shutdown.&nbsp; Also, since this is a fixed voltage regulator it is not possible to change the output voltage from
> 3.3V.<br><br>If I am misunderstanding your suggestion, please let me know where I&#39;m going wrong!<br><br>Steve<br><br><div><span class="gmail_quote">On 5/14/07, <b class="gmail_sendername">Jeff Sadowski</b> &lt;<a href="mailto: [hidden email]">
> [hidden email]</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">3.3V is low maybe you should up it a little.<br>
> <br>On 5/14/07, Steve Sakoman &lt;<a href="mailto:[hidden email] ">[hidden email]</a>&gt; wrote:<br>&gt; &gt;If the on-gumstix regulator(s) are shutting down, try lowering the<br>&gt; &gt;v_batt supply to 4V if you can from 5V.
> <br>&gt;<br>&gt; I scoped the wifistix 3.3V output.&nbsp;&nbsp;It was a steady 3.3V before during and<br>&gt; after the crash/reboot.&nbsp;&nbsp;Same transmit timeout error again this time.<br>&gt;<br>&gt; I measured the case temp of the regulator on the wifistix (U$5).&nbsp;&nbsp;It was
> <br>&gt; 119F.&nbsp;&nbsp;If I recall correctly,&nbsp;&nbsp;this is in spec for that part.<br>&gt;<br>&gt; I also measured the case temp of the wifi module.&nbsp;&nbsp;It was 140F.&nbsp;&nbsp;Is this in<br>&gt; spec for the module?<br>&gt;<br>&gt; The ambient temp is 103F, which should be in spec for all of the gumstix
> <br>&gt; components, right?<br>&gt;<br>&gt; Steve<br>&gt;<br>&gt;<br>&gt; On 5/14/07, Craig Hughes &lt; <a href="mailto:[hidden email]">[hidden email]</a>&gt; wrote:<br>&gt; &gt; On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> <br>&gt; &gt;<br>&gt; &gt; &gt; Drew,<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; Good thought, but the weather has been bone dry.&nbsp;&nbsp;Today it&#39;s 100F<br>&gt; &gt; &gt; in the equipment area with a RH of about 10%.&nbsp;&nbsp;I&#39;m in shorts &amp; t-
> <br>&gt; &gt; &gt; shirt and the sweat is evaporating as fast as it comes out :-)<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; I am beginning to suspect thermal shutdown on a linear regulator.<br>&gt; &gt; &gt; As the temperature has climbed I am seeing the problem with greater
> <br>&gt; &gt; &gt; regularity.&nbsp;&nbsp;I need to get back to my office to look at the gumstix<br>&gt; &gt; &gt; schematics to find places to probe the 3.3V supplies.<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; Thanks for helping with the brainstorming!
> <br>&gt; &gt;<br>&gt; &gt; If the on-gumstix regulator(s) are shutting down, try lowering the<br>&gt; &gt; v_batt supply to 4V if you can from 5V.<br>&gt; &gt;<br>&gt; &gt; C<br>&gt; &gt;<br>&gt; &gt;<br>&gt; &gt;<br>&gt; &gt;
> <br>&gt; &gt;<br>&gt; -------------------------------------------------------------------------<br>&gt; &gt; This SF.net email is sponsored by DB2 Express<br>&gt; &gt; Download DB2 Express C - the FREE version of DB2 express and take
> <br>&gt; &gt; control of your XML. No limits. Just data. Click to get it now.<br>&gt; &gt; <a href="http://sourceforge.net/powerbar/db2/ ">http://sourceforge.net/powerbar/db2/</a><br>&gt; &gt; _______________________________________________
> <br>&gt; &gt; gumstix-users mailing list<br>&gt; &gt; <a href="mailto: [hidden email]">[hidden email]</a><br>&gt; &gt;<br>&gt; <a href=" https://lists.sourceforge.net/lists/listinfo/gumstix-users">
> https://lists.sourceforge.net/lists/listinfo/gumstix-users </a><br>&gt; &gt;<br>&gt;<br>&gt;<br>&gt; -------------------------------------------------------------------------<br>&gt; This SF.net email is sponsored by DB2 Express
> <br>&gt; Download DB2 Express C - the FREE version of DB2 express and take<br>&gt; control of your XML. No limits. Just data. Click to get it now.<br>&gt; <a href=" http://sourceforge.net/powerbar/db2/">http://sourceforge.net/powerbar/db2/
> </a><br>&gt; _______________________________________________<br>&gt; gumstix-users mailing list<br>&gt; <a href="mailto: [hidden email]">[hidden email]</a><br>&gt; <a href=" https://lists.sourceforge.net/lists/listinfo/gumstix-users">
> https://lists.sourceforge.net/lists/listinfo/gumstix-users </a><br>&gt;<br>&gt;<br><br>-------------------------------------------------------------------------<br>This SF.net email is sponsored by DB2 Express<br>Download DB2 Express C - the FREE version of DB2 express and take
> <br>control of your XML. No limits. Just data. Click to get it now.<br><a href="http://sourceforge.net/powerbar/db2/"> http://sourceforge.net/powerbar/db2/</a><br>_______________________________________________<br>gumstix-users mailing list
> <br><a href="mailto:[hidden email]">[hidden email]</a><br><a href=" https://lists.sourceforge.net/lists/listinfo/gumstix-users">https://lists.sourceforge.net/lists/listinfo/gumstix-users
> </a><br></blockquote></div><br>
>
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Re: wifistix issue

Jeff Sadowski
there are other conditions that could effect it.
Humidity is one. EMF(Is there a transformer near by?, Any electrical
equiptment?)
Vibrations?(do you have the platic screws and separators?


On 5/14/07, Steve Sakoman <[hidden email]> wrote:

> Hunyue,
>
> I'm fairly convinced that this is a temperature related problem.  I brought
> a second unit out to the field that was operating continuously on my bench
> without problem for the last couple of weeks.  I ran it off the same bench
> supply and cables that I used on the bench.  It failed within a half hour,
> and then repeatedly within seconds after a reboot after that first failure.
> The ambient temperature was over 100F.
>
> I returned the unit & power supply to my bench (72F ambient) and it has been
> working without problem for the past hour.  Not proof yet, but time will
> tell.
>
> Steve
>
>
> On 5/14/07, [hidden email] <[hidden email]> wrote:
> > Not sure if this helps, but another datapoint is I have seen
> > this behavior with a CFstix and Linksys CF11 WiFicard. It would
> > workfine for low traffic but as soon as I do anything like stream
> > audio, the gumstix would crash/reset in a very similar manner. The
> > regulator did not feel warm and I have tried bringing down the
> > voltage.
> >
> > -- Hunyue
> >
> > >
> > > Jeff,
> > >
> > > >3.3V is low maybe you should up it a little.
> > >
> > > Perhaps it's the heat, but I'm confused by your comment!
> > >
> > > The wifistix has a 3.3V fixed linear regulator on board.  I was
> measuring
> > > the output of this regulator in order to make sure the thermal shutdown
> > > feature of the linear regulator was not kicking in and causing the
> issues I
> > > am experiencing.   A 3.3V reading is expected on the output of this
> > > regulator, and anything significantly different would be cause for
> concern.
> > > I was happy to see that the regulator was not going into thermal
> shutdown.
> > > Also, since this is a fixed voltage regulator it is not possible to
> change
> > > the output voltage from 3.3V.
> > >
> > > If I am misunderstanding your suggestion, please let me know where I'm
> going
> > > wrong!
> > >
> > > Steve
> > >
> > > On 5/14/07, Jeff Sadowski <[hidden email]> wrote:
> > > >
> > > > 3.3V is low maybe you should up it a little.
> > > >
> > > > On 5/14/07, Steve Sakoman <[hidden email]> wrote:
> > > > > >If the on-gumstix regulator(s) are shutting down, try lowering the
> > > > > >v_batt supply to 4V if you can from 5V.
> > > > >
> > > > > I scoped the wifistix 3.3V output.  It was a steady 3.3V before
> during
> > > > and
> > > > > after the crash/reboot.  Same transmit timeout error again this
> time.
> > > > >
> > > > > I measured the case temp of the regulator on the wifistix (U$5).  It
> was
> > > > > 119F.  If I recall correctly,  this is in spec for that part.
> > > > >
> > > > > I also measured the case temp of the wifi module.  It was 140F.  Is
> this
> > > > in
> > > > > spec for the module?
> > > > >
> > > > > The ambient temp is 103F, which should be in spec for all of the
> gumstix
> > > > > components, right?
> > > > >
> > > > > Steve
> > > > >
> > > > >
> > > > > On 5/14/07, Craig Hughes < [hidden email]> wrote:
> > > > > > On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:
> > > > > >
> > > > > > > Drew,
> > > > > > >
> > > > > > > Good thought, but the weather has been bone dry.  Today it's
> 100F
> > > > > > > in the equipment area with a RH of about 10%.  I'm in shorts &
> t-
> > > > > > > shirt and the sweat is evaporating as fast as it comes out :-)
> > > > > > >
> > > > > > > I am beginning to suspect thermal shutdown on a linear
> regulator.
> > > > > > > As the temperature has climbed I am seeing the problem with
> greater
> > > > > > > regularity.  I need to get back to my office to look at the
> gumstix
> > > > > > > schematics to find places to probe the 3.3V supplies.
> > > > > > >
> > > > > > > Thanks for helping with the brainstorming!
> > > > > >
> > > > > > If the on-gumstix regulator(s) are shutting down, try lowering the
> > > > > > v_batt supply to 4V if you can from 5V.
> > > > > >
> > > > > > C
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> -------------------------------------------------------------------------
> > > > > > This SF.net email is sponsored by DB2 Express
> > > > > > Download DB2 Express C - the FREE version of DB2 express and take
> > > > > > control of your XML. No limits. Just data. Click to get it now.
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> > > > > > _______________________________________________
> > > > > > gumstix-users mailing list
> > > > > > [hidden email]
> > > > > >
> > > > >
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> -------------------------------------------------------------------------
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> > > > >
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > > >
> > > > >
> > > >
> > > >
> -------------------------------------------------------------------------
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> > > > control of your XML. No limits. Just data. Click to get it now.
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> > > > _______________________________________________
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> > > >
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> > > >
> > >
> > > ------=_Part_73904_450632.1179185473500
> > > Content-Type: text/html; charset=ISO-8859-1
> > > Content-Transfer-Encoding: 7bit
> > > Content-Disposition: inline
> > >
> > > Jeff,<br><br>&gt;3.3V is low maybe you should up it a
> little.<br><br>Perhaps it&#39;s the heat, but I&#39;m confused by your
> comment!<br><br>The wifistix has a 3.3V fixed linear regulator on
> board.&nbsp; I was measuring the output of this regulator in order to make
> sure the thermal shutdown feature of the linear regulator was not kicking in
> and causing the issues I am experiencing.&nbsp;&nbsp; A
> > > 3.3V reading is expected on the output of this regulator, and anything
> significantly different would be cause for concern.&nbsp; I was happy to see
> that the regulator was not going into thermal shutdown.&nbsp; Also, since
> this is a fixed voltage regulator it is not possible to change the output
> voltage from
> > > 3.3V.<br><br>If I am misunderstanding your suggestion, please let me
> know where I&#39;m going
> wrong!<br><br>Steve<br><br><div><span
> class="gmail_quote">On 5/14/07, <b class="gmail_sendername">Jeff
> Sadowski</b> &lt;<a href="mailto: [hidden email]">
> > > [hidden email]</a>&gt; wrote:</span><blockquote
> class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204);
> margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">3.3V is low maybe you should
> up it a little.<br>
> > > <br>On 5/14/07, Steve Sakoman &lt;<a href="mailto:[hidden email]
> ">[hidden email]</a>&gt; wrote:<br>&gt; &gt;If the on-gumstix
> regulator(s) are shutting down, try lowering the<br>&gt; &gt;v_batt supply
> to 4V if you can from 5V.
> > > <br>&gt;<br>&gt; I scoped the wifistix 3.3V output.&nbsp;&nbsp;It was a
> steady 3.3V before during and<br>&gt; after the
> crash/reboot.&nbsp;&nbsp;Same transmit timeout error again this
> time.<br>&gt;<br>&gt; I measured the case temp of the regulator on the
> wifistix (U$5).&nbsp;&nbsp;It was
> > > <br>&gt; 119F.&nbsp;&nbsp;If I recall correctly,&nbsp;&nbsp;this is in
> spec for that part.<br>&gt;<br>&gt; I also measured the case temp of the
> wifi module.&nbsp;&nbsp;It was 140F.&nbsp;&nbsp;Is this in<br>&gt; spec for
> the module?<br>&gt;<br>&gt; The ambient temp is 103F, which should be in
> spec for all of the gumstix
> > > <br>&gt; components, right?<br>&gt;<br>&gt;
> Steve<br>&gt;<br>&gt;<br>&gt; On 5/14/07, Craig Hughes &lt; <a href="mailto:
> [hidden email]">[hidden email]</a>&gt; wrote:<br>&gt; &gt; On May 14,
> 2007, at 2:37 PM, Steve Sakoman wrote:
> > > <br>&gt; &gt;<br>&gt; &gt; &gt; Drew,<br>&gt; &gt; &gt;<br>&gt; &gt;
> &gt; Good thought, but the weather has been bone dry.&nbsp;&nbsp;Today
> it&#39;s 100F<br>&gt; &gt; &gt; in the equipment area with a RH of about
> 10%.&nbsp;&nbsp;I&#39;m in shorts &amp; t-
> > > <br>&gt; &gt; &gt; shirt and the sweat is evaporating as fast as it
> comes out :-)<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; I am beginning to suspect
> thermal shutdown on a linear regulator.<br>&gt; &gt; &gt; As the temperature
> has climbed I am seeing the problem with greater
> > > <br>&gt; &gt; &gt; regularity.&nbsp;&nbsp;I need to get back to my
> office to look at the gumstix<br>&gt; &gt; &gt; schematics to find places to
> probe the 3.3V supplies.<br>&gt; &gt; &gt;<br>&gt; &gt; &gt; Thanks for
> helping with the brainstorming!
> > > <br>&gt; &gt;<br>&gt; &gt; If the on-gumstix regulator(s) are shutting
> down, try lowering the<br>&gt; &gt; v_batt supply to 4V if you can from
> 5V.<br>&gt; &gt;<br>&gt; &gt; C<br>&gt; &gt;<br>&gt; &gt;<br>&gt;
> &gt;<br>&gt; &gt;
> > > <br>&gt; &gt;<br>&gt;
> -------------------------------------------------------------------------<br>&gt;
> &gt; This SF.net email is sponsored by DB2 Express<br>&gt; &gt; Download DB2
> Express C - the FREE version of DB2 express and take
> > > <br>&gt; &gt; control of your XML. No limits. Just data. Click to get it
> now.<br>&gt; &gt; <a
> href="http://sourceforge.net/powerbar/db2/
> ">http://sourceforge.net/powerbar/db2/</a><br>&gt; &gt;
> _______________________________________________
> > > <br>&gt; &gt; gumstix-users mailing list<br>&gt; &gt; <a href="mailto:
> [hidden email]">[hidden email]</a><br>&gt;
> &gt;<br>&gt; <a href="
> https://lists.sourceforge.net/lists/listinfo/gumstix-users">
> > >
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> </a><br>&gt; &gt;<br>&gt;<br>&gt;<br>&gt;
> -------------------------------------------------------------------------<br>&gt;
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> > > </a><br>&gt;
> _______________________________________________<br>&gt;
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> [hidden email]">[hidden email]</a><br>&gt;
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> > >
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> mailing list
> > > <br><a href="mailto:
> [hidden email]">[hidden email]</a><br><a
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