Re: Canon 7D locks up with "Full PC" when controlled from Pi1

Hi Marcus,
Thanks for the response!

I’m not using gphoto to shoot the picture at all; the actual shot is triggered from an Arduino connected to the exposure trigger. Image is recorded to the CF card as if I were manually pressing the exposure button. (Reason is, I require sub-5ms accuracy for controlling bulb mode. I’m doing bulb-ramped timelapses and gphoto’s part is to switch the ISO.)
The error occurs even before shooting the first picture. Reading the ISO (or anything else) too often in a short space of time is enough to put the 7D into the FullPC error state.

 two new data points:
- Raspberry Pi3 also triggers the behaviour
- got my hands on a 5D Mk IV. Can not reproduce the problem with that camera.

Re Mac - not sure I understand the question; I’m using gphoto2 so I’m implicitly using libgohoto2. But I haven’t built any own program just using libghoto2. But the Mac is just for the cross-check; since it works fine there, it demonstrates that the problem isn’t cross-platform.

Regards,
Dave

________________________________
From: Marcus Meissner <[email protected]>
Sent: Friday, August 24, 2018 8:59 AM
To: David Bell
Cc: [email protected]
Subject: Re: [Gphoto-user] Canon 7D locks up with "Full PC" when controlled from Pi1

Hi,

On Wed, Aug 22, 2018 at 10:36:53AM +0200, David Bell wrote:
> Hi,
> I'm seeing the problem that my 7D (Mark 1) locks up when I do too many
> consecutive gphoto2-calls in a short space of time. The message on the
> 7D-LCD-display is "Full PC". Once it's in that state, nothing works, and
> the error is usually only cleared by power cycling the camera.
>
> I'm only seeing the problem when the 7D is connected to a Raspberry. Tested
> on Pi 1 (running the Pi variant of Debian 8.0), and also on a Pi Zero W
> (running debian 9.4). Connected to a Mac, I can't replicate the problem.
>
> gphoto2 --summary doesn't cause the problem, get-config (for example
> gphoto2 --get-config iso) causes the problem. Calling gphoto in, say, less
> than 3 second intervals, is very likely to cause the problem; with
> intervals over 5s it happens much more seldom.
>
> Versions in all cases: gphoto-version 2.5.17, libgphoto2 2.5.19,
> libgphoto2_port 0.12.0
>
> Any idea as to possible causes?

Are you using libgphoto2 on the Mac?

Two things might be possible:

- You did not download all the SDRAM capture pictures. If some are left, the
SDRAM of the camera will fill up.

- The SDRAM capture mode is also weird a bit.
The library tells the EOS camera how much diskspace

is left and the camera uses this knowledge. We try to set a fixed high value, but
the camera might get confused.

First check if you download everything :)

Ciao, Marcus

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