Hello,
my name is Jan Blazicek. I am currently working on a high speed stereo 3D
algorithm using an array of Elphel NC353L-369 cameras in a near-linescan mode.
We’ve had pretty good success with them on my previous projects so we chose not
to reinvent the wheel and used them again. Before I go any further - thanks for
a great product. They may have their issues, but they are a real workhorse
product.
Anyway, the problem I am currently facing has to do with triggering. I am
apparently having trouble understanding your documentation on the matter,
because the cameras simply refuse to operate in a Master-Slave mode. I’ll
describe the setup I came up with this far:
I have soldered together a RJ14 4p4c cable according to your schematics, here’s
my interpretation of those:
http://blazicekj.s3.amazonaws.com/Elphel/trigger_cable.png
Camera 1 is connected to the left end, camera 2 to the right end.
Camera 1 settings:
TRIG_PERIOD=2533201
TRIG_OUT=0x800000 (Which should output the FPGA signal to the RJ14)
TRIG_CONDITION=0x0
TRIG=0x4 (Set after all the others)
Now if everything has been properly set up (Like the exposure being set really
low and the resolution is 320x240 so that the camera can actually run at higher
fps than the FPGA signal frequency) this seems to work. It limits the camera to
around 38 fps. It is a bit hit and miss to set it up, but it does work in the
end. I don’t have access to an oscilloscope at the moment, but I have checked
it with a LED and it seems to output the signal to the trigger cable.
The second camera however freezes no matter what I do, here’s the best set of
settings I could muster up:
TRIG_OUT=0x0
TRIG_CONDITION=0x200000
TRIG=0x4 (Set last, as soon as I do this, no matter what the other settings
are, the camera stops responding.)
Here are most of the settings of both cameras:
http://blazicekj.s3.amazonaws.com/Elphel/cam1_params.xml
http://blazicekj.s3.amazonaws.com/Elphel/cam2_params.xml
In the second case TRIG is still 0, because as soon as I set that it stops
responding.
Hopefully, there’s something obvious I am missing. It’s hard enough to
calibrate two cameras without triggering and it would be even worse for more
than 2. If you need anything else like logs from the camera, let me know. I
haven’t found any interesting log files myself this far.
Oh and here are the firmware versions etc.:
Currently Installed Firmware Version: Elphel (R) Model 353 Camera release 8.2.16
Camera Serial Number: 00:0E:64:08:1E:15
FPGA Release Number: 353402b
Currently Installed Firmware Version: Elphel (R) Model 353 Camera release 8.2.16
Camera Serial Number: 00:0E:64:08:1E:23
FPGA Release Number: 353402b
Thank you very much for any help you can provide and have a great day,
Jan Blazicek.
_______________________________________________
Support-list mailing list
Support-list@support.elphel.com
http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
