[Elphel-support] camera triggering

[Alexandre Poltorak]

Andrey,

I made a test, please see attached image. The LED is triggered just before
all the sensor was erased and the exposure time is limited to 10ms.
Everything work as expected, but:

If I try to flip the image the blue band stay at the same place and not
moving to the top of the image as I would expect. Could you explain this
behavior please ?

Best regards,
Alexandre

On Thu, Jul 1, 2010 at 1:25 AM, Alexandre Poltorak <alexandre at elphel.com>wrote:

> 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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