wake up ppc to start Alarm

[sahoopes]

I have just run some tests. My device is one of those that does not support Hardware.ScreenOn. I tried to wake up device with BackLightOn and KeepAlive. These actually seem to work once the device is "awake."

However, in another related thread, Erel said:

You can't run any code while the device is suspended (OS design).

Herein lies my problem from this thread, and probably the same problem with the alarm clock app in this thread. Once the device is suspended no code will run. That is, you can trigger your app through RunAppAtEvent and RunAppAtTime events but the app will not actually run. It is waiting to run.

Placing any of the "wake up" functions even at the very beginning of your app will not help since the app will not even load until after the device wakes up. This also means CableGuy's suggestion of simulating a keypress wouldn't work either.

If applications cannot load and no code will run while the device is suspended, then how does my device wake up for:
alarms?
appointments?
phone calls?

And even Sprite Backup faithfully starts on schedule while the device is asleep.

[sahoopes]

Will this work SetSystemPowerState?

[Erel]

No.
As written in msdn:

System power states define maximum device power levels for all power-manageable devices in the system. If a device is already at or below the maximum power level mandated by the new system power state, the device power state will not be updated.

[agraham]

Originally Posted by sahoopes

then how does my device wake up for

I believe it is done by the Real Time Clock hardware on the device that runs to keep the correct(!) time even when the device is "off". It has a register within it that is set to the required wakeup time and when the time matches the register contents the hardware switches the device on.

[sahoopes]

Originally Posted by agraham

I believe it is done by the Real Time Clock hardware on the device that runs to keep the correct(!) time even when the device is "off". It has a register within it that is set to the required wakeup time and when the time matches the register contents the hardware switches the device on.

How would an application, that cannot run while device is suspended, tell the RTC to wake up the device?

I'm betting the answer is it can't.

[agraham]

Originally Posted by sahoopes

How would an application, that cannot run while device is suspended, tell the RTC to wake up the device?

By setting the register in the RTC that holds the wakeup time before turning the device off. This is how your alarms, appointments and backups start on time. A phone call also wakes the device by hardware. In this case the phone hardware turns the device on when a phone call comes in.

I have looked but haven't so far been able to find the low-level API that the apps use to set a wake-up time. Something must be available as alarms etc. appear to work on your device while you say RunAppAtTime doesn't.

[Mr_Gee]

When using g-alarm the application on first use states that my PPC has some bug,
because of this the alarm might not work correctly.
next you have the option of fixing it.

I think this has to do with the issue described above, but apparently there is a workaround/fix.

I'll send him a PM, maybe he's willing to help

-= edit=-
he replied with this:
AGEye.de: Home of G-Alarm, G-Watch, G-Light, G-Invaders and Caver
But I'm not sure if this would/could solve the issue...

[chanppc]

I came across this article, at System Power States section, it mention that when system state is "Resuming", the following happen:

When a device wakes up from sleeping, it is in this mode. The backlight and the screen are still off (this is where we can call the Hardware1.BackLightOn to turn on the screen), and programs have a 15 second window to switch the device to another power state before the device automatically goes back to the suspended state.

During testing, after my device wake up from CeRunApAtTime, it goes back to suspended state exactly after 15 second, to overcome this issue, I call the .net "PowerPolicyNotify" to "unattended power mode" & it work! (togather with Hardware1.BackLightOn & hardware1.KeepAlive)

I hope this will help the rest

[ashrafidkaidek]

chanppc,

can you please post a code example, to show how your code overcome this issue.

Thank you

[Discorez]

How to do display backlight on, if HardWare.ScreenON not supported on my device? With PowerNotify library (PowerNotify.BacklightOn) too does not work...
Other ways of solution exist?

My device - Samsung i8000 (Omnia II)