shoot_full to shoot_half

barberofcivil

268

« on: 07 / December / 2007, 14:52:01 »

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As has been pointed out elsewhere, when in continuous shooting mode, you can keep the shutter release halfway down between indvidual shots to control the number of shots instead of hold it all the way down continuously or releasing completely and resetting your bracketing. It seems that this can't be emulated in scripting, it seems that once the "shoot_full" command is engaged, the current press "shoot_half" gets cancelled, so the camera returns to the unpressed state. Would ther be a way in the code to add this as a feature, a command that releases a shoot_full only to shoot_half? This would enable making scripts which utilise the continuous mode and bracketing, but with a set number of frames.

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barberofcivil

268

Re: shoot_full to shoot_half

« Reply #1 on: 07 / December / 2007, 15:11:13 »

Quote from: Barney Fife on 07 / December / 2007, 15:01:27

Did you try it in all the various flavors?

click "shoot_half"
press "shoot_half"
release "shoot_half"

click "shoot_full"
press "shoot_full"
release "shoot_full"

I've not tried it yet (busy doing so many other things right now) but some combo and sleep sequence might work.

Maybe a press "shoot_half", click "shoot_full", sleep 500, (do some counter), release "shoot_half".

When first writing scripts I found out how touchy some delays needed to be and when the proper order of events had to take place.

Code: [Select]
press "shoot_half" sleep 500 for x=1 to 10 click "shoot_full" sleep 500 next x sleep 500 release "shoot_half"
Is how I might approach it, for starters.

I tried different variations, but the shoot_half gets released or overidden when the shoot_full is activated whether by press, click, release.

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GrAnd

916
[A610, S3IS]

Re: shoot_full to shoot_half

« Reply #2 on: 07 / December / 2007, 15:31:31 »

It seems impossible right now. I can explain.

The shutter button has three states and corresponding keyboard bit-mask:
* released - 00
* half-pressed - 01
* full-pressed - 11
As you can see, if the shutter is full-pressed, it's still half-pressed.

Then, the commands:
"press" - sets a bit(s) using bit-mask
"release" - clears a bit(s)
"click" - just executes "press" and then "release"

So, it's impossible to get half-press mask if full-press mask was applied.
Just the example:

Code: [Select]

Initial state:  0 0
    Action             State
press   "half_shoot"    0 1
release "half_shoot"    0 0

press   "full_shoot"    1 1
release "full_shoot"    0 0 

press   "half_shoot"    0 1
press   "full_shoot"    1 1
release "full_shoot"    0 0

press   "half_shoot"    0 1
press   "full_shoot"    1 1
release "half_shoot"    1 0    <- incorrect combination (how it can be - the button state jumps over half-pressed direct to full-pressed?); camera ignores it
release "full_shoot"    0 0

press   "full_shoot"    1 1
release "??????????"    0 1    <- you need this state, but no button/mask for this command
release "full_shoot"    0 0

If you try to execute the following sequence:

Code: [Select]

press   "full_shoot"    1 1
release "full_shoot"    0 0
press   "half_shoot"    0 1

, the camera do not miss 'release "full_shoot"' and will process it accordingly.

« Last Edit: 07 / December / 2007, 15:33:09 by GrAnd »

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CHDK Developer.

barberofcivil

268

Re: shoot_full to shoot_half

« Reply #3 on: 07 / December / 2007, 15:54:27 »

Quote from: GrAnd on 07 / December / 2007, 15:31:31

It seems impossible right now. I can explain.

I understand why it doesn't work in the scripting, but do you mean it's also impossible in the firmware code because of this?
Somehow the camera is able to transition from half to full and back again without resetting to the full release state.

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