Taking pictures from the playback mode - General Discussion and Assistance - CHDK Forum
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Taking pictures from the playback mode

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Offline RaduP

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Taking pictures from the playback mode
« on: 18 / April / 2009, 20:35:55 »
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I was wondering, is it possible to tell the camera take a picture from the playback mode, with the lens retracted? I mean, just take the picture, not try to extend the lenses, focus, etc.
Or will the camera complain about the lenses not being ready?
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Offline fudgey

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Re: Taking pictures from the playback mode
« Reply #1 on: 25 / April / 2009, 11:11:01 »
The sensor is powered off in play mode... (You are trying to work around lens errors?)
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Offline RaduP

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Re: Taking pictures from the playback mode
« Reply #2 on: 25 / April / 2009, 13:42:23 »
Yep, that's what I would like to do.
Is there a function to power on/off the sensor, or is it part of some bigger function that does the whole thing, including the lenses?
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Offline fudgey

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Re: Taking pictures from the playback mode
« Reply #3 on: 26 / April / 2009, 18:13:47 »
Sorry, don't know about that...take a dive in the disassembly and find out  :P
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Offline reyalp

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Re: Taking pictures from the playback mode
« Reply #4 on: 26 / April / 2009, 18:41:56 »
Quote from: RaduP on 25 / April / 2009, 13:42:23
Yep, that's what I would like to do.
Is there a function to power on/off the sensor, or is it part of some bigger function that does the whole thing, including the lenses?
There are several tasks devoted to shooting and controlling the sensor. Convincing them to run in the wrong state, or replicating their functionality would be a huge amount of work.
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Offline RaduP

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Re: Taking pictures from the playback mode
« Reply #5 on: 26 / April / 2009, 19:18:19 »
Hmm, then maybe tricking the camera to think the lens is already extended? I guess it saves that state somwhere and then check if it is already extended or not. So setting the right variable MIGHT work.
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Offline reyalp

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Re: Taking pictures from the playback mode
« Reply #6 on: 26 / April / 2009, 19:56:12 »
Quote from: RaduP on 26 / April / 2009, 19:18:19
Hmm, then maybe tricking the camera to think the lens is already extended? I guess it saves that state somwhere and then check if it is already extended or not. So setting the right variable MIGHT work.
It will not be a single variable. A large amount of state is changed when switching modes. Tasks are created or woken up, propcases change, variable change, hardware is initialized.

The only way to accomplish what you want will be extensive analysis of the factory firmware. If you want to actually accomplish something, that where you need to start, rather than idle speculation.

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Offline RaduP

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Re: Taking pictures from the playback mode
« Reply #7 on: 26 / April / 2009, 21:40:01 »
Quote from: reyalp on 26 / April / 2009, 19:56:12
It will not be a single variable. A large amount of state is changed when switching modes. Tasks are created or woken up, propcases change, variable change, hardware is initialized.
I was talking about a variable to make the camera not exend the lens, I was not talking about one variable that changes the whole state..

Quote
If you want to actually accomplish something, that where you need to start, rather than idle speculation.
No, first you need to determine if it is possible, and then you do an extensive analysis of the firmware.
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