[ros-users] call for testing: camera1394 in C-turtle

[Eric Perko]

Jack,

Would it at least be possible for the driver to detect whether a
setting was accepted or not?

If we can, perhaps the driver should try to set the values, ask the
camera what values it has and then warn the user if they are
different. This wouldn't solve the problem of cameras claiming to
support things they don't, but would at least let the user know that
there is a problem as opposed to trying to change settings and not
seeing anything happen.

- Eric

On Wed, Jun 16, 2010 at 11:05 AM, Jack O'Quin <jack.oquin at gmail.com> wrote:
> On Wed, Jun 16, 2010 at 10:00 AM, Patrick Beeson <beeson.p at gmail.com> wrote:
>> Furthermore, setting auto_shutter: 3 and shutter: 0.006 doesn't work.
>> Setting shutter: 257, which I expected to work after my last email, didn't
>> work.  It seems no values sent to shutter are working. I do not know if it
>> is making it into manual mode or not.
>>
>>
>> On 06/16/2010 09:54 AM, Patrick Beeson wrote:
>>>
>>> Jack,
>>>
>>> Manual control of shutter does not work right in dynamic configuration.
>>> For the Sony Firewire cameras that you have on Marvin, the manual slider
>>> in the gui goes from 0 to 1. Auto shows (for my lighting) a number of
>>> 0.006. However, I was noticing that no calues between 0 and 16 were
>>> making a difference. Running, Coriander, I see that I can go from 3 to
>>> 1150 on the slider which equate to a shutter speed of 0.00001 to 16.0
>>> seconds. So, the values you send to set the shutter are not floats in
>>> seconds, but integers (0-16; should be 3-1150 for my camera).
>
> I think what's happing is that the camera lies and says it accepts
> "absolute" (i.e. float) values. The driver, seeing "absolute_capable
> == true", tries to set the values using
> dc1394_feature_set_absolute_value() instead of
> dc1394_feature_set_value().
>
> Not sure how to handle this in a portable fashion that works for all cameras.
> --
>  joq
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