[Elphel-support] Synchronizing with an external flash

[Eric Boudrand]

Hi Andrey,

Thanks for the help.

After calling "wget http://192.168.0.9:8081/trig/pointers" how can I
download the corresponding image frame ? 

Calling the page did not trigger the flash device. I should check the
voltage input. The voltage converter works because I saw several flash
lights once I plugged the cable (it must be a capacitor discharging). It
was not synchronized with the camera.

Is it possible to save the trigger settings in order to reload them
after reboot ?

Regards.

Éric Boudrand


Le mardi 24 juillet 2012 à 10:38 -0600, Andrey Filippov a écrit :
> Hello Eric,
> "TRIG_PERIOD = 1" means single trigger mode  (camera can not work at
> 96000000 fps - period is measured in pixel clock cycles, normally
> 96MHz), in this mode you may still trigger the camera with
> http://192.168.0.9:8081/trig/pointers (assuming 192.168.0.9)
> 
> The camvc program freezes, because it used all the php instances (by
> default - 3, that number can be increased at the expense of more
> memory used), and the php scrips (as camvc.php) are waiting for the
> camera to be triggered). You can unfreeze the camera over telnet with
> "killall -9 lighttpd" - the web server will be automatically restarted
> together with the php instances.
> Port 8081 (in http://192.168.0.9:8081/trig/pointers) is used by
> another server (imgsrv) that does not need php running.
> 
> Andrey
> 
> On Tue, Jul 24, 2012 at 10:15 AM, Eric Boudrand <dev at boudrand.net> wrote:
> > Hi,
> >
> > When I set :
> > TRIG = 4
> > TRIG_PERIOD = 1
> > TRIG_CONDITION = 0
> > TRIG_OUT = 0x800000
> > I lose http connection to the camvc.html. Ping is working. I can restart
> > the camera, but the settings are not kept. Any idea ?
> >
> > Regards.
> >
> > Éric Boudrand
> >
> >
> >
> > Le mardi 24 juillet 2012 à 12:12 +0200, Alexandre Poltorak a écrit :
> >> Hi Eric,
> >>
> >> TRIG_PERIOD - defines FPS (1/frame period; FPS = 96000000 / TRIG_PERIOD)
> >> Example: 3840000 [decimal] for 25FPS
> >>
> >> Best regards,
> >> Alexandre
> >>
> >> ----- Mail original -----
> >> | De: "Eric Boudrand" <dev at boudrand.net>
> >> | À: "Oleg" <support-list at support.elphel.com>
> >> | Envoyé: Mardi 24 Juillet 2012 11:05:10
> >> | Objet: Re: [Elphel-support] Synchronizing with an external flash
> >> |
> >> | Hi Oleg
> >> |
> >> | > You might have seen the schematics -
> >> | > http://wiki.elphel.com/images/9/9a/10369a.pdf
> >> | >
> >> | I haven't seen it. Thanks.
> >> |
> >> | > So, you get 5V only on the PIN 4 of J15. TRIG_OUT=0x800000.
> >> |
> >> | Ok. I'am using this now. I have resolder the cable and I got 5V on
> >> | the
> >> | output despite the fact I made a mistake in the configuration. I set
> >> | 0x800000 in decimal value of TRIG_OUT.
> >> |
> >> | > 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
> >> | >
> >> | I have read this page. But, it is not clear. I do not understand how
> >> | TRIG_OUT is computed. I will use the values from the page.
> >> |
> >> | Concerning TRIG_PERIOD, if I set 0x500, does this value means 1280
> >> | sec ?
> >> |
> >> | Regards.
> >> |
> >> | Éric Boudrand
> >> |
> >> |
> >> |
> >> | _______________________________________________
> >> | Support-list mailing list
> >> | Support-list at support.elphel.com
> >> | http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
> >> |
> >
> >
> > _______________________________________________
> > Support-list mailing list
> > Support-list at support.elphel.com
> > http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com