[Elphel-support] Flash on a two camera system

[Andrey Filippov]

Andreas,

Why do you need  pulse _before_ trigger? With this senor exposure of the
first line start 8 scan lines after the trigger, last line exposure starts
1/15 sec later. So if you want to use a flash, you need to set the exposure
time >1/15 sec and trigger flash 1/15 after the trigger.
The FPGA has delay timer, when the camera is triggered externally, this
programmable delay is between the arrival of the sync pulse and the sensor
triggering. When the camera is set to trigger directly from the FPGA
(trigger condition =0), the delay sensor is triggered immediately, and the
output sync is delayed by the programmed value - you may use it for the
flash. Unfortunately it is for a single camera only.
If you still need pulse before the sensor trigger - you may just reverse the
trigger source - use external pulse, apply it to multiple cameras in
parallel - each camera can  be individually delayed by programming
TRIG_DELAY parameter.

Andrey
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