[Elphel-support] stereo camera with BW CCD

[support-list]

Daniel

For FPS control I meant using TRIG=4 as described in http://wiki.elphel.com/index.php?title=Trigger
TRIG_CONDITION=0 means that the FPGA timer will generate trigger pulses, not the external connector

Did you try to change height after reducing width (and getting bad images)?

Do both sensors work correctly with reduced WOI if only one is used, not both?

Andrey



---- On Thu, 05 Sep 2013 14:19:01 -0700 drouan <daniel.rouan at obspm.fr> wrote ---- 


Thanks Andrey,
Le 5 sept. 2013 à 09:36, support-list <support-list at support.elphel.com> a écrit :

>In fact for my application, I had to buy (at some Chinese website)  longer cables and I just installed only one on one channel, keeping the original medium long on the other: is it a possible cause of the problem ?

Daniel, yes - it can cause problem - those that are visible on the first image. Do you see what I mean?




Yes I do: the purple streaks on the bottom image.
  
As for the original problem - I think it is very unlikely to be related.

As for the clock-to-data phase adjustment - it should be possible to adjust the phase for that particular sensor to fix it. What is the length of the new cable and what was the original one?




20 cm, but I bought two and my intention is to change both for the final application. 


Here is why this adjustment is needed:
In the camera we do not use the output clock from the sensor, because in some instances when it is "not happy" it stops the clock, and the FPGA depends on continuous sesnor-synchronous clock. So FPGA uses internal clock and adjusts the phase of the data strobe to latch the incoming data. and when the length of the cable changes, so does the phase of the incoming data.




It looks clear.  




Now coming back to the initial problem of scrambled images when WOI_WIDTH is < 2560 .  


I changed the first  SENSOR_RUN TO 1  and made a few tests  : when WOI_WIDTH = 2592 or 2576, the image is correct.  When it is 2560 or
below, I get a uniformly grey image even after several <refresh>.  I then asked for the actual frame_rate with a small php script :
echo elphel_get_P_value(51)/1000 ;and get  "normal" values between 2.4 and 5.3 fps. 



After the grey image, when I try to come back to a WOI_WIDTH = 2592, the image is still grey, until I restore SENSOR_RUN TO 2.
Are there other sensor registers that it would be useful to read during those tests ? 
 
  Daniel

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