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

[Andrey Filippov]

Peter,

Earlier you confirmed that the following sequence

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

does not freeze the camera:
> Correct if I do just those settings it doesn't freeze.

So does it freeze if you add just one setting (you may set it after the
previous ones) ?

3)  TRIG_OUT=0x800000

Andrey







On Mon, May 17, 2010 at 3:43 PM, Peter Rakhunov
<prakhunov at safespeedllc.com>wrote:

> Hello,
>
> Okay so my question is how do i get around this bug? Because no matter
> when I set TRIG=4 it just keeps on freezing even if I set everything
> else first, then hit apply again without setting TRIG, then I hit
> apply with TRIG=4 and not changing anything else it still freezes.
>
> Thanks,
>
> Peter
>
> On Mon, May 17, 2010 at 4:14 PM, Andrey Filippov <andrey at elphel.com>
> wrote:
> > 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
> >> >> >
> >> >> >
> >> >
> >> >
> >
> >
>
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