Ángel, J15 pin 1: GND pin 2: camera input, GPIO[10], +5V pin 3: camera input, to GND pin 4: camera output, GPIO[11], +5V
You can begin with connecting 1-3 & 2-4, setting correct parameters and testing with oscilloscope how it works. The circuit diagram can be found on our wiki - the link is right under the 10369 functional diagram. Oleg On 2 February 2010 14:12, Ángel <[email protected]> wrote: > 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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