Ramote Control and USB - DryOS Development - CHDK Forum
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Ramote Control and USB

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Offline alvm

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Ramote Control and USB
« on: 27 / February / 2013, 13:47:30 »
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Hi,

I see in kbd.c that for remote control chdk clear USB bit (for a800 for example) so a cam always think that USB cable is not connected. But how does USB part of canon f/w  work in this case?

Thanks,
Alex.
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Offline waterwingz

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Re: Ramote Control and USB
« Reply #1 on: 27 / February / 2013, 14:38:03 »
Quote from: alvm on 27 / February / 2013, 13:47:30
I see in kbd.c that for remote control chdk clear USB bit (for a800 for example) so a cam always think that USB cable is not connected. But how does USB part of canon f/w  work in this case?
It only does that in <ALT> mode.  When that happens, Canon USB firmware is essentially disabled.
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Offline alvm

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Re: Ramote Control and USB
« Reply #2 on: 27 / February / 2013, 14:47:00 »
Quote from: waterwingz on 27 / February / 2013, 14:38:03
It only does that in <ALT> mode.  When that happens, Canon USB firmware is essentially disabled.

Yes, but how does work Remote Control (as I understand it uses USB) and ptp client?
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Offline waterwingz

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Re: Ramote Control and USB
« Reply #3 on: 27 / February / 2013, 15:02:59 »
Quote from: alvm on 27 / February / 2013, 14:47:00
Yes, but how does work Remote Control (as I understand it uses USB) and ptp client?
I guess the question is what do you mean by "remote control"?

The USB bit you are seeing in kbd.c is used to determine if there is +5V present on the USB power pin.   CHDK uses the presence or absence of that voltage as a "remote" signal to indicate something should happen  (like take a photograph).

PTP functionality is accomplished by communications over the two data lines on the USB conneector.

The two "remote controls" are completely different things.


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Offline alvm

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Re: Ramote Control and USB
« Reply #4 on: 27 / February / 2013, 15:15:17 »
I mean remote control using USB transport like ptp client but as I inderstood from your words chdk's remote control uses USB power line for control. So when USB bit is cleared by chdk USB doesn't work and ptp can't be used, right?
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Offline waterwingz

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Re: Ramote Control and USB
« Reply #5 on: 27 / February / 2013, 15:30:15 »
Quote from: alvm on 27 / February / 2013, 15:15:17
So when USB bit is cleared by chdk USB doesn't work and ptp can't be used, right?
No.   PTP works fine unless you enable USB Remote in the CHDK menus.

http://chdk.wikia.com/wiki/USB_Remote#Enabling_USB_Remote_operation

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Offline alvm

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Re: Ramote Control and USB
« Reply #6 on: 27 / February / 2013, 15:36:35 »
Quote from: waterwingz on 27 / February / 2013, 15:30:15
No.   PTP works fine unless you enable USB Remote in the CHDK menus.

http://chdk.wikia.com/wiki/USB_Remote#Enabling_USB_Remote_operation



Thanks, Waterwingz!
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Offline LILIAKU

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Re: Ramote Control and USB
« Reply #7 on: 18 / July / 2013, 17:53:26 »
Whoops, wrong thread...
« Last Edit: 18 / July / 2013, 18:03:38 by LILIAKU »
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