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looking for help about PTP on A710

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looking for help about PTP on A710
« on: 19 / February / 2011, 18:30:21 »
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Hi everyone,

I am pretty new here, and I am looking for the advises on how to get PTP to work with my camera (A710). I am a university student, and try to make use of the PTP to remotely control the camera which is mounted in the plane that we build.

I looked at that PTP interface thread and still did not figure out how to get the basic thing to work. The status that I am in right now is that I built the lasted CHDKDE and put it onto the SD card. Then I tried to connect the camera with the PC and ran ptpcam (by using the cammand "ptpcam.exe --chdk" or "ptpcam.exe -l"), but it seems that the USB connection cannot be established with following msg: "Could not find any device matching given bus/dev numbers, retrying in 1 s...."

My question would be do I actually need to go to either CHDK source code or ptpcam one to modify any file in order to make the PTP to work? I saw some people successfully make the PTP to work but I am not sure what are the steps to do so.

Thanks in advance. Any help is greatly appreciated.

JL

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Offline reyalp

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Re: looking for help about PTP on A710
« Reply #1 on: 19 / February / 2011, 18:37:00 »
You need the libusb driver (edit to add: configured for your camera), and you need to not have anything else trying to access the camera over PTP.

On my D10, using XP, browsing the camera in explorer prevents ptpcam from connecting. Other auto-actions on camera connect also seem to have this effect.

With CHDKDE, you should not need to modify the CHDK or ptpcam source.
Don't forget what the H stands for.

Re: looking for help about PTP on A710
« Reply #2 on: 19 / February / 2011, 19:44:46 »
Thank you very much for your reply.

My understanding would be right now I will need to have a suitable libusb driver in order to use PTP, however, by any chance do you know how I could get that or I have to write my own libusb driver?

Also another follow up question would be do I need to enable USB-remote control in the chdk menu in order to properly use the ptpcam? Because I think if I disable the usb-remote control function in the chdk menu, my computer (window 7) will automatically treat the camera as a usb device (i.e. access picture from it).

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Offline reyalp

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Re: looking for help about PTP on A710
« Reply #3 on: 19 / February / 2011, 22:54:22 »
My understanding would be right now I will need to have a suitable libusb driver in order to use PTP, however, by any chance do you know how I could get that or I have to write my own libusb driver?
You need libusb-win32. This is discussed in the ptp thread.

The CHDK ptp wiki page may also be useful, although it's a bit out of date http://chdk.wikia.com/wiki/PTP_Extension
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Also another follow up question would be do I need to enable USB-remote control in the chdk menu in order to properly use the ptpcam?
No, USB remote must be OFF in order to have any USB communication (ptpcam or regular PTP file transfer) with the camera.

"USB remote" is for a USB shutter release which detects only the USB power signal, and hides this signal from the rest of the camera. See http://chdk.wikia.com/wiki/USB_Remote_Cable

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, my computer (window 7) will automatically treat the camera as a usb device (i.e. access picture from it).
You should be able to configure what windows does when the camera is plugged in, but I've never used this on win7 so I don't know the specifics.
Don't forget what the H stands for.


 

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