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

[Andrey Filippov]

On Fri, May 7, 2010 at 4:09 PM, Peter Rakhunov
<prakhunov at safespeedllc.com>wrote:

> Hello Andrey,
>
> It seems that having it always take a picture is not a requirement  ,
> but I've been looking through the elphel website and I can't really
> find the documentation on the following steps.
>
> So basically when it takes a picture we just want it to flash.
>
> If I understand correctly if I set TRIG to 0x4 in parsedit.php it will
> be in trigger mode.
>
> I couldn't find much documentation on this part is how do I trigger
> the camera internally? We can always make a circuit that we control
> that will trigger the external trigger but we would prefer to do this
> over the network because it will simplify what we are trying to
> accomplish.
>
> Again if I'm understanding this correctly if we can get it to trigger
> internally and if I set TRIG_OUT to 0x800000 I think it will make it
> send out a pulse on GPIO[11], which will be connected to a circuit
> that will set off the flash.
>
> Now I think TRIG_CONDITION should be left at 0 because the mouse over
> says 0 is internal but again I couldn't find any documentation on how
> to trigger this internally.
>
> If you can help with that, that would be great!
>
> Thank You,
>
> Peter Rakhunov
>
>
> Peter,
>
> Yes, you can do it that way with the settings as you wrote. Here is my
> previous post on how to set camera into internal trigger mode:
> http://www.mail-archive.com/support-list@support.elphel.com/msg00005.html
> Does it work for you?
>
> Using the camera in that way (w/o FPGA modification) is possible, just the
> maximal frame rate will be 1/2 of what the sensor can do, because you still
> need exposure time >= frame readout time, and readout may start only afte
> the full frame is exposed (and at thet time you need to fire flash).
>
> Another note - if you run camera full frame in JPEG or JP46 (not JP4) mode,
> FPGA will be slightly slower than the sensor. In free running mode drive
> takes care of that by adding  vertical blankig when needed (limiting full
> frame FPS to about 10.5 fps). In triggered mode there is no such check, so
> you have to take care of the frame rate (not a problem in the flash mode, of
> course).
>
> Andrey
>
>
>
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