Touch sleeps

hello all,

when I do not touch my touch panel for some time (about 10 minutes) it does
not accept the first touch. Then it works without problems.

System: WinCE 5.0, XScale PXA 270

Any ideas ?

Kind regards

Bruce
Thu Apr 24 07:17:31 PDT 2008

Could be that the system has timed out the backlight, but that you backlight
control doesn't know about it so the backlight is still on. Then when you
press the touch, it is eaten to turn the backlight on.

--
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT EuroTech DOT com

EuroTech Inc.
www.EuroTech.com

"frax" <frax@discussions.microsoft.com> wrote in message
news:49ED6498-DE14-4D7F-A6EF-33DE339323D1@microsoft.com...
> hello all,
>
> when I do not touch my touch panel for some time (about 10 minutes) it
> does
> not accept the first touch. Then it works without problems.
>
> System: WinCE 5.0, XScale PXA 270
>
> Any ideas ?
>
> Kind regards
>

Dean
Thu Apr 24 08:06:26 PDT 2008

Or you are missing/mishandling the pendown interrupt for some reason...

--
Dean Ramsier - eMVP
BSQUARE Corporation


"Bruce Eitman [eMVP]" <beitman.nospam@applieddata.net.nospam> wrote in
message news:unRcwXhpIHA.1420@TK2MSFTNGP03.phx.gbl...
> Could be that the system has timed out the backlight, but that you
> backlight control doesn't know about it so the backlight is still on.
> Then when you press the touch, it is eaten to turn the backlight on.
>
> --
> Bruce Eitman (eMVP)
> Senior Engineer
> Bruce.Eitman AT EuroTech DOT com
>
> EuroTech Inc.
> www.EuroTech.com
>
> "frax" <frax@discussions.microsoft.com> wrote in message
> news:49ED6498-DE14-4D7F-A6EF-33DE339323D1@microsoft.com...
>> hello all,
>>
>> when I do not touch my touch panel for some time (about 10 minutes) it
>> does
>> not accept the first touch. Then it works without problems.
>>
>> System: WinCE 5.0, XScale PXA 270
>>
>> Any ideas ?
>>
>> Kind regards
>>
>
>

K
Thu Apr 24 10:27:55 PDT 2008

And sometime it might because the Vref of the AC '97 codec is discharged ( I
assume you are using a codec with Touch panel controller) for some reason,
the first ADC sample may not be accurate so that it was dropped by the
driver.

"Dean Ramsier" <ramsiernospam@nospam.com> wrote in message
news:%232rO2yhpIHA.4620@TK2MSFTNGP06.phx.gbl...
> Or you are missing/mishandling the pendown interrupt for some reason...
>
> --
> Dean Ramsier - eMVP
> BSQUARE Corporation
>
>
> "Bruce Eitman [eMVP]" <beitman.nospam@applieddata.net.nospam> wrote in
> message news:unRcwXhpIHA.1420@TK2MSFTNGP03.phx.gbl...
>> Could be that the system has timed out the backlight, but that you
>> backlight control doesn't know about it so the backlight is still on.
>> Then when you press the touch, it is eaten to turn the backlight on.
>>
>> --
>> Bruce Eitman (eMVP)
>> Senior Engineer
>> Bruce.Eitman AT EuroTech DOT com
>>
>> EuroTech Inc.
>> www.EuroTech.com
>>
>> "frax" <frax@discussions.microsoft.com> wrote in message
>> news:49ED6498-DE14-4D7F-A6EF-33DE339323D1@microsoft.com...
>>> hello all,
>>>
>>> when I do not touch my touch panel for some time (about 10 minutes) it
>>> does
>>> not accept the first touch. Then it works without problems.
>>>
>>> System: WinCE 5.0, XScale PXA 270
>>>
>>> Any ideas ?
>>>
>>> Kind regards
>>>
>>
>>
>
>

frax
Fri Apr 25 01:18:08 PDT 2008

It seems that you are right.

The settings for backlight are in
HKEY_CURRENT_USER\ControlPanel\BackLight

Strangewise setting SwitchOffEnable to 0 did not help.

But the problem got solved by setting ACTimeout to 0 (I am always connected
to AC).

The backlight is always on so I did not look in this direction.

Thank you for your help.


"Bruce Eitman [eMVP]" wrote:

> Could be that the system has timed out the backlight, but that you backlight
> control doesn't know about it so the backlight is still on. Then when you
> press the touch, it is eaten to turn the backlight on.
>
> --
> Bruce Eitman (eMVP)
> Senior Engineer
> Bruce.Eitman AT EuroTech DOT com
>
> EuroTech Inc.
> www.EuroTech.com
>
> "frax" <frax@discussions.microsoft.com> wrote in message
> news:49ED6498-DE14-4D7F-A6EF-33DE339323D1@microsoft.com...
> > hello all,
> >
> > when I do not touch my touch panel for some time (about 10 minutes) it
> > does
> > not accept the first touch. Then it works without problems.
> >
> > System: WinCE 5.0, XScale PXA 270
> >
> > Any ideas ?
> >
> > Kind regards
> >
>
>
>