Re: Putting CM-X270 in power saving mode...
- From: Elias Radi <lelo@xxxxxxxxxx>
- Date: 31 May 2007 13:19:14 -0700
Gajanan,
The device is most probably going into Sleep Mode when no activity
exists. To take advanced on all the power modes on the PXA27x, the BSP
should support them. Below are the least to most power saving modes:
Idle Mode: The BSP is probably already putting the processor in Idle
Mode when no threads are running.
Deep Idle Mode: This is a bit more complicated than idle mode, since
some drivers will need adjusting when using a low freq clock, example:
LCD. Check with the BSP vendor if they have this implemented.
Standby Mode: Check if this is implemented with the BSP vendor, but I
have my doubts.
Sleep Mode: Is also called Suspend mode, this is probably when is
happening when no activity event is triggered
Deep Sleep: is the lowest power consumption mode, kinda like a
poweroff.
Depending on what is supported in the BSP, the Idle and Deep Idle
require no work from your end.
Sleep and Deep Sleep, will require a setting to the BSP or maybe a
change (depending on how the vendor has things setup) to wakeup the
device on a Keypad press or a ToughScreen press, or a CF card plug
in...etc. So the device might not be waking up because of this missing
"wakeup" on key press feature. Or it is hanging on the way into or out
of Sleep mode.
Elias
On May 31, 12:17 am, Gajanan.A...@xxxxxxxxx wrote:
Hi all,
We are developing a product with both h/w and s/w. Our h/w is based on
compulab's CM-X270 board with intel PXA-270 processor. Our application
is supposed to run 24x7 continuously. We are writing our software in
WINCE. In order to save power we are planning to write our application
power aware. If there is not thread activity then system should run in
low power mode. As per CMX documentation it say's PXA-27x has 5 power
states namely Idle Mode, deep idle Mode, standby Mode, sleep mode and
deep sleep mode.
My question is that how to achieve this? I mean I tried changing
activity timers value from control panel-power manger icon. As soon as
time set elapses the system directly goes in to standby mode and does
not even responds to key board. What may be the problem?
- Do we need to make changes in BSP?
- Or it is possible to achieve the low power functionality without
changing the BSP.
Please help.
Regards,
Gajanan
.
- References:
- Putting CM-X270 in power saving mode...
- From: Gajanan . Agre
- Putting CM-X270 in power saving mode...
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