[Elphel-support] Using the RJ14 port to trigger a camera flash?

[Andrey Filippov]

Peter,

that means that both trigger output and trigger input are operational. This
test (it is just a php script) turns the trigger output off, measures
trigger input, then turns output on and measures input again. If input was
"off" in the first measurement and "on" in the second the program concludes
that this is a "master" camera - the one that drives the synchronization
pair of wires. You may connect oscilloscope between them and see these
signals (the trigger input is opto-isolated, but the output is not, one of
the signals is connected to camera ground).

If you run the camera from the FPGA trigger (TRIG=4, TRIG_CONDITION=0) you
may make the output generate pulse before each frame by setting TRIG_OUT.

Andrey

On Mon, May 17, 2010 at 2:55 PM, Peter Rakhunov
<prakhunov at safespeedllc.com>wrote:

> Hello Andrey,
>
> Yes it says role is equal to master.
>
> Thanks,
>
> Peter
> On Wed, May 12, 2010 at 6:01 PM, Andrey Filippov <andrey at elphel.com>
> wrote:
> > Peter,
> >
> > that sequence is caused by a latency bug - camera driver relies on frame
> > sync interrupts and initially internal generator is stopped, so it seems
> > that switching (TRIG=4) happens before the generator gets programmed.
> >
> > Next step - test the connector (with external it would be a connector
> with 2
> > jumpers 1-3 and 2-4
> > http://wiki.elphel.com/index.php?title=10369#J15_-_SYNC_.28external.29
> >
> > Then open the page
> > http://camera_ip/sync.php?role=detect&channel=external
> >
> > it should tell "role=master", w/o connector "role=slave"
> >
> >
> >
> > (for internal connectors it would be
> > http://camera_ip/sync.php?role=detect&channel=internal)
> >
> > Andrey
> >
> > On Wed, May 12, 2010 at 4:23 PM, Peter Rakhunov <
> prakhunov at safespeedllc.com>
> > wrote:
> >>
> >> Andrey,
> >>
> >> Correct if I do just those settings it doesn't freeze.
> >>
> >> Peter
> >>
> >> On Wed, May 12, 2010 at 5:19 PM, Andrey Filippov <andrey at elphel.com>
> >> wrote:
> >> > Peter,
> >> >
> >> > Does the camera work  with internal trigger?
> >> >
> >> > 1) set TRIG_PERIOD= (124f800)
> >> >     and "apply" in parsedit.php (should be done before changing other
> >> > parameters TRIG=4)
> >> > 2)  TRIG=4
> >> >       EARLY_TIMESTAMP=1
> >> >      TRIG_CONDITION = 0x0
> >> >
> >> > Andrey
> >> >
> >> >
> >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://support.elphel.com/pipermail/support-list_support.elphel.com/attachments/20100517/ec7a0c2c/attachment-0002.html>