John Smith wrote:
I am just wondering if it is possible to turn on and
off the capture on the fly without loading and
unloadng modules (laugh as you may but that is only
way I can think of now). The reason for doing this is
to reduce the heat in my M1K box so the cpu can run at
lower speed thus less noise. I have PVR150 MCE version
which is working great. Thanks for the good work.
What I think you're asking is if you can put the card to a low power
mode, since the card isn't always capturing. In theory, you should be
able to shut down a lot of the subsystems and put the card in sleep.
However, when it comes back from sleep any settings may or may not be
retained.
As a quick test I did this:
cx25840ctl -s < sleep
And the card did cease to work properly. I'm not sure if it is
using less power and generating less heat in this mode. You'll have to
let us know.
Before capture you'll need to wake the card back up
cx25840ctl -s < wakeup
As well as set your options on it again using ivtvctl (capture width
and height are not preserved, I'm sure there's more).
<< sleep
PWR_DN_CH3=1
PWR_DN_CH2=1
PWR_DN_CH1=1
PWR_DN_ADC2=1
PWR_DN_ADC1=1
PWR_DN_DLL2=1
PWR_DN_DLL1=1
PWR_DN_TUNING=1
SLEEP=1
<< wakeup
PWR_DN_CH3=0
PWR_DN_CH2=0
PWR_DN_CH1=0
PWR_DN_ADC2=0
PWR_DN_ADC1=0
PWR_DN_DLL2=0
PWR_DN_DLL1=0
PWR_DN_TUNING=0
SLEEP=0
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