Re: Libusb-win32 code to control Ricoh Theta

Hello, Ekkehard,

I had the same thought about using a USB 'sniffer' to see how PTP requests
should be formed, but unfortunately Ricoh's PC software does not control
the camera.  It mostly updates firmware -- and here is the log I recorded
while updating firmware using USBTrace (similar to USBSnoop):
www.insightdigital.org/Ricoh_Theta_Device_Log_USBTrace.html

The connection statistics with the device are here:
www.insightdigital.org/Theta_log.html

I also tried the various permutations of buffer string length you
suggested, to no avail.

Thanks again,

-Kevin


On Mon, Jul 21, 2014 at 12:24 AM, Ekkehard <[email protected]>
wrote:

> Hi,
> the trailing 0x00 was just a guess since often text strings are "zero
> terminated". I dont have any closer information about what you are doing,
> sorry.
> If you have a sample program that can trigger the capture, you may try to
> use "UsbSnoop" to see the data transmitted.
>
> http://sourceforge.net/projects/usbsnoop/
>
> Best regards
> Ekkehard
>
>
> Kevin Cain wrote
> > Thank you for your suggestions, Ekkehard,
> >
> > The 'memset(buffer, 0, 64)' command I send should fill the buffer with
> '0'
> > values, unless I'm making a fundamental error.  I will try your variants.
> >  Your suggestion that the camera may require a trailing '0' is
> interesting
> > -- I will try that as well, is there any reference to support that?
> >
> > I suspect my problem is in correctly deducing the parameters required to
> > send messages to the Theta via libusb, e.g.:
> >
> > *int usb_control_msg(usb_dev_handle *dev, int requesttype, int request,
> > int
> > value, int index, char *bytes, int size, int timeout);*
> >
> > I used USBTrace to detect the Ricoh-provided driver and uploaded the
> > results here:
> > www.insightdigital.org/Ricoh_Theta_Device_Log_USBTrace.html
> >
> > However, I don't yet see how to find the request details for the camera
> in
> > question.  I assume this comes up each time a programmer wishes to
> control
> > a new device with libusb -- are there any resources that might help me?
> >
> > Any help divining the correct syntax and message protocol parameters
> would
> > be wonderful.
> >
> > Thanks,
> >
> > -Kevin
> >
> >
> > On Sun, Jul 20, 2014 at 3:25 AM, Ekkehard &lt;
>
> > edomning@
>
> > &gt;
> > wrote:
> >
> >> Hi,
> >> I have'nt done anything with the camara matter. From the programmers
> >> view,
> >> there is one thing I dont understand.
> >> The used bytes the buffer are only  15 = "trigger-capture", but you are
> >> sending 64 bytes. If the command detection algo in the camera validating
> >> the
> >> length of the buffer first, than the command will not be recognised.
> >> So maybe you can try
> >> int result = usb_control_msg(devHandle, 0x21, 9, 0x2, 0x0,
> (char*)buffer,
> >> 15, 100); if (result == 15) cout << "Successfully sent all bytes to
> >> camera"
> >> << endl;
> >> or, if the camera may expect one zero at the end of the command
> >> int result = usb_control_msg(devHandle, 0x21, 9, 0x2, 0x0,
> (char*)buffer,
> >> 16, 100); if (result == 16) cout << "Successfully sent all bytes to
> >> camera"
> >> << endl;
> >>
> >> A minor thing, as far as I know there is no need to claim the interface
> >> since the control mesaages are not related to any interface.
> >>
> >> Best regards
> >> Ekkehard
> >>
> >>
> >>
> >>
> >> --
> >> View this message in context:
> >>
> http://libusb.6.n5.nabble.com/Libusb-win32-code-to-control-Ricoh-Theta-tp5713450p5713451.html
> >> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
> >>
> >>
> >>
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> >>
> >
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>
> --
> View this message in context:
> http://libusb.6.n5.nabble.com/Libusb-win32-code-to-control-Ricoh-Theta-tp5713450p5713455.html
> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
>
>
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