[Elphel-support] Global Reset Release

[Elphel Support]

Asa,

I added control of the GRR mode to the camera general parameters - before you had to set sensor register for that - only two modes were possible in "TRIG" parameter 0 - free running ERS and 4 - ERS snapshot. I added 5 - for GRR snapshot, and tried it in the cocotb simulation. We'll try it with an LED and the actual camera, make sure it is recorded on all the sensor.

Andrey

---- On Wed, 21 Sep 2016 22:37:05 -0700 Elphel Support<support-list at support.elphel.com> wrote ---- 

Asa,

Readout time of ~1/15 s is for full size/full resolution of the sensor. Smaller the WOI - shorter the time, sensor datasheets have formulai for the readout time. What kind of flash (and the flash duration) do you plan to use? And what resolution/frame rate?

I'm just working on inter-camera synchronization, same output can be used to fire a flash with programmable delay. Sensor strobe output is not used, the output pulse is generated in the FPGA (so it does not depend on particular sensor type) it is a 5V pulse available (when programmed so) on the 2.5mm audio connector on the camera (marked "sync" here http://wiki.elphel.com/images/0/0f/NC393-CS_marked_ports.jpeg )

Andrey


---- On Wed, 21 Sep 2016 22:06:46 -0700 Asa Hammond<asa at prenav.com> wrote ---- 

I understand the difference between global shutter and GRR. Interested to use with a flash.  Is the readout always 1/15s? No matter what the exposure setup?We can try it with the 5mp for now.

On Wed, Sep 21, 2016 at 6:53 PM, Elphel Support <support-list at support.elphel.com> wrote:
Hello Asa,

How do you plan to use global reset release? It is not a global shutter (all pixels erased at once, but read out of the full frame still takes ~1/15 s) Do you plan to connect a flash light source? Otherwise the pixel exposure will be proportional to row number.

It is possible to use such mode with 5MPix and the software that I described in the last blog article, we did not yet made a compatible driver for the 14 MPix, but it will be soon (~month) ready.

Andrey






 

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