Re: [gphoto-devel] gp_camera_exit does not close or leave port on canon 400d

[Marcus M. <ma...@je...>]

On Mon, Feb 23, 2009 at 12:18:36PM +0100, Edgar Mueller wrote:
> Hi there,
> 
> this is the very first time I'm writing to a mailing list.
> The reason is that I got a problem dealing with gphoto2 and my canon
> 400d.
> I'm developing a program to control my astronomical equipment including
> timebase controlled exposure on the 400d.
> The exposure is done by sending signals from my computer to an atmel avr
> (microcontroler) which is executing the exposure in the requested time.
> That works fine.
> After searching the net how to download images from the dslr after
> exposure is done I found gphoto2 will perfectly meet my needs.
> Set the code up and try to download works fine too.
> The problem occurs when I combine exposure and downloading.
> Uaaah...sorry for my poor english.
> To simplify my problem:
> If I trigger once with remote control (could be any) and download the
> last image taken that works.
> After downloading no triggering is possible anymore. It might be that
> gphoto2 is not freeing the port of the 400d correctly.
> If i unplug the cable to the 400d and plug back again trigger once is
> possible again.
> 
> I tried to figure this out for days now and could not find any solution.
> I tried gtkam to be sure my installed gphoto libs are
> working...but...nearly with same result.
> First time showing all files works. Refreshing brings up an error "I/O
> camera in use" or something like this.

We had another report that exposure setting is only possible once, this
seems to be the same problem.

We reverse enginereed this protocol, and I am afraid some details are not
yet known to us.

Ciao, Marcus