[Elphel-support] Synchronizing with an external flash

[Oleg]

Hi Eric,

You might have seen the schematics -
http://wiki.elphel.com/images/9/9a/10369a.pdf

So, you get 5V only on the PIN 4 of J15. TRIG_OUT=0x800000.

PINs 2 & 3 need an external power source. They are galvanically decoupled
with the camera's circuitry. GPIO[10] controls a diod.
So if you would like to use PIN2 you should connect: V+=>PIN3,
PIN2=>FLASH=>GND.

TRIG_OUT should be 0x200000. Each GPIO has 2 bits in this register. You
probably saw this page as well -
http://wiki.elphel.com/index.php?title=Trigger

Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124
Elphel, Inc.

On 21 July 2012 09:29, Eric Boudrand <dev at boudrand.net> wrote:

> Hello
>
> > Of course it only works if the camera is in triggered mode.
> > http://wiki.elphel.com/index.php?title=Trigger
>
> Some questions are raising while reading the documentation pages.
> http://wiki.elphel.com/index.php?title=Synchronizing_353
>
> I have plugged a 4P4C connector with a 4-wires cable to J15. Is this
> connector GPIO[11] ? I have chosen to use PIN 2 on that connector.
>
> I am using between the J15 connector and the external flash a LD117 with
> an adjustable output voltage (using a potentiometer). I must be cautious
> because I can damage my flash in case of incorrect voltage...
>
> Should my Elphel settings be the following ones ?
> TRIG = 4
> TRIG_CONDITION = 0
> TRIG_OUT = 0x400000 (I'm using bit 22)
> TRIG_PERIOD = 1
> TRIG_BITLENGTH = 31
> EXTERN_TIMESTAMP = 0
> XMIT_TIMESTAMP = 0
> Thanks in advance for your help. I am not sure of TRIG_OUT value.
>
> Regards.
>
> Éric Boudrand
>
>
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>
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