Thank you very much, Oleg & Andrey. I'm in the process of understanding the camera. Since I have access to a digital sampling oscilloscope I would like to play a little with triggering.
So, what pins of J15 must I connect the signal and ground wires of the function generator output to? Thank you, again. Ángel. 2010/2/2 Andrey Filippov <[email protected]> > Ángel, > > Couple more notes about external triggering. > > This is a "Electronic Rolling Shutter" sensor, so there are some natural > limitations on what you can do with external triggering. If you want just to > synchronize two cameras - it is easy, but you can not trigger the camera > that way from a flash (there are some other ways how to do that). External > trigger on the sensor level work in the following way: > 1 - sensor waits for the trigger to occur, to data and sync signals are > output > 2 - after the trigger sensor skips 8 scan lines (for some internal reasons) > 3 - sensor _starts_ to erase scan line - one by one - the it will take > about 1/15 seconds to clear the full 5 MPix frame > 4 - after waiting specified exposure time from start of the erasing process > (sensor does not need to wait the full frame to be erased!) sensor starts > readout - line by line, at the same pace the erase process (initiated at > step 3). > The process of readout (and so exposure of the last line in the frame) will > ens in 8*scan_line_time + exposure time + frame_readout_time. > > If you want to catch some instantaneous event (i.e. flash) you'll need to > set exposure time to > frame readout time and initiate that event after the > full frame is erased but before the first line is read out. > > Second note is related to the camera driver - because of pipeline operation > (described in > http://www.linuxfordevices.com/c/a/Linux-For-Devices-Articles/Elphel-camera-under-the-hood-from-Verilog-to-PHP/) > it heavily depends on the frame sync pulses from the sensor. So if the > sensor is stopped so is the driver that among others handle all the > parameter changes. If the camera is set to external trigger mode and there > is no trigger coming - the driver will effectively get stuck. > > Andrey > -- Elphel NC353L-369 (12-36 VDC) + Computar H2Z0414C-MP
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