[Elphel-support] camera triggering

[Alexandre Poltorak]

Hi Andrey,

I start to understand how it works and I have few more questions now.

If several cameras are synchronized together, and TRIG_DELAY is set to 0,
what front of the TRIG_BITLENGTH is used to trigger the sensors ? The
beginning or the end ?

Now what if I would like to use 10 cameras and film in FullHD @ 25 FPS with
each camera, but in triggered mode and delayed so that final result would be
250 FPS frames. As I understood TRIG_DELAY will force all slave cameras to
have the same delay.

I also noticed that while the camera is not triggering (during the boot
sequence) the LED attached to J15 connector of the master camera is always
on. As soon as the sensor is configured the led start to blink from trigger.
The question is can I use this port in free-running mode to power an
external 2,5" SATA hard drive ?

Best regards,
Alexandre Poltorak

On Tue, Jun 22, 2010 at 9:27 PM, Alexandre Poltorak <alexandre at elphel.com>wrote:

> Hi,
>
> I am experimenting with camera triggering. First I am trying internal
> triggered mode where the FPGA trigger the sensor once per second + an
> external flash (in my case just a LED).
>
> My settings are:
> 5MPix JPEG color images, 200ms exposure time
>
> TRIG 4
> TRIG_OUT 800000
> TRIG_PERIOD 96000000
> TRIG_BITLENGTH 255
> XMIT_TIMESTAMP 1
>
> First of all it seems TRIG 4 must be applied separately after the other
> parameters. If not the compressor stop after the first frame.
>
> I see my led blinking once per second. The problem is that I can not see my
> led on the image. I tried to play with TRIG_DELAY. If I set the delay to
> 50000000 pixel clocks I can see the LED on ~4/5 of the image, on the last
> part of the image the LED is already OFF.
>
> I do not understand where exactly the trigger is before the exposure is
> started.
>
> More tests coming soon..
>
> Best regards,
> Alexandre
>
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