Peter raises some interesting possibilities:
>What happens if one of the remote devices wants to send some data to
the PDA ??=20
>Or can you make sure that this will not happen ?? If it can happen you
need some=20
>sort of wakeup on your host. If the host can wake up on serial line
activity this=20
>is fine, but as far as I remember this is not possible with an X-scale.
- suppose the master has suspended and its BT radio is still awake
maintaining=20
the network integrity. If another new device does something as simple as
hci scan,=20
how will the BT device of the suspended processor behave? I suspect that
the BT=20
device will be unable to handle this and will probably do something
ugly.
>If you are sure that the above will not cause you problems you could
put=20
>all active connections into park mode, which will allow the BT chip to
save=20
>a lot of power. However, you have to remember the state of each active=20
>connection to unpark it once your host wakes up. Because you have to
remeber=20
>te connections states a bluetooth stop / start is not an option. You
have to=20
>add (I don't know if there already is something, but from Marcels
answer I=20
>think it is not) power management at least to the HCI layer which parks
the=20
>slaves if you enter low power state and unparks them when you come
back.
Your idea to park the connections is worth pursuing. My applications can
park/un-park during the X-scale suspend/wakeup sequence. All of my
applications=20
"know" about that a system-wide suspend is taking place, so they can do
what's=20
necessary. I'm not sure that this is what I would ultimately want to do,
but
Its worth hacking something together to see if it works at all.
I'm not sure if my peripheral devices support park mode, but that's=20
worth looking into.
Thanks for the idea.
Rich
----------------------------
Richard B. Williams
Vitronics, Inc.
An MTC Technologies Company
3 Corbett Way
Eatontown, NJ 07724-2262
732-389-0244 x29
[email protected]
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Hi Richard,
On Thu, 10 Feb 2005, Williams, Richard wrote:
> - suppose the master has suspended and its BT radio is still awake
> maintaining
> the network integrity. If another new device does something as simple as
> hci scan,
> how will the BT device of the suspended processor behave? I suspect that
> the BT
> device will be unable to handle this and will probably do something
> ugly.
It may also be a good idea to disable page / inquiry scan on the local
radio.
Ciao,
Peter
| Peter Wippich Voice: +49 30 46776411 |
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