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flash without shutter?

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Offline jls3512

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flash without shutter?
« on: 04 / August / 2013, 02:19:57 »
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Is there a way to fire either the built in flash, hot shoe flash, or both without taking a photo on a canon s5is?
how about setting the flash output power?
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Offline waterwingz

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Re: flash without shutter?
« Reply #1 on: 04 / August / 2013, 02:37:18 »
Quote from: jls3512 on 04 / August / 2013, 02:19:57
Is there a way to fire either the built in flash, hot shoe flash, or both without taking a photo on a canon s5is?
No.  Or I probably would have suggested it here : http://chdk.setepontos.com/index.php?topic=10486

Quote
how about setting the flash output power?
use this :
http://chdk.wikia.com/wiki/Script_commands#set_config_value
to set this :
http://chdk.wikia.com/wiki/CHDK_1.2.0_User_Manual#Manual_Flash_.2B_Power
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Offline reyalp

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Re: flash without shutter?
« Reply #2 on: 04 / August / 2013, 04:02:59 »
Quote from: waterwingz on 04 / August / 2013, 02:37:18
Quote from: jls3512 on 04 / August / 2013, 02:19:57
Is there a way to fire either the built in flash, hot shoe flash, or both without taking a photo on a canon s5is?
No.
Not directly with script commands, but it has been done see http://chdk.setepontos.com/index.php?topic=2655.0

The functions described by ewavr in http://chdk.setepontos.com/index.php?topic=2655.msg25065#msg25065 are available as eventprocs (registered by 'Capture.Create' on a540), through creating a struct requires some gymnastics with lua strings or AllocateMemory and poke.

You can also fire the flash by poking MMIOs on many cameras. On a540, poke(0xc0220074,0x46) does the trick. Many people have discovered this while searching for LEDs... However, I would give this a very strong "try at your own risk" warning. If it is possible to damage hardware using CHDK, messing with this is probably a good candidate.
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