LED notification
Andy Green
andy at openmoko.com
Sat Oct 11 13:20:46 CEST 2008
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Sam Kuper wrote:
> 2008/10/9 Andy Green <andy at openmoko.com <mailto:andy at openmoko.com>>
>
> Robert Norton wrote:
> > 2008/10/9 Robin Paulson <robin.paulson at gmail.com
> <mailto:robin.paulson at gmail.com>>:
> >> the main cpu is suspended, like in the neo, but the power
> management unit is not
> > I'm sure I recently read a datasheet for a PMU which supported various
> > flash patterns for LEDs even during suspend. Unfortunately I can't
> Not really a PMU but an i2c device for just doing that. We might be
> using one or another in future products
>
>
> To me, having the phone able to perform basic notification functions
> (LED blink, vibrate, make a sound) on certain events, even when the
> phone is on standby, seems like a very desirable - not to say obvious -
> feature.
Well you can simply wake and do "event" type actions like vibrate and
flash LEDs then, the stimulus you are responding to like incoming call
will be a CPU wake event so that lot will work.
What can't be done (because of a completely Linux-centric POV in the
design) is anything while the CPU is off in suspend. We can leave a LED
on during suspend, but there is no intelligence to flash it or whatever.
So overall it's not quite as bad as it sounded I hope.
- -Andy
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