PAG7936: exposure/strobe output on P10?

OpenMV Boards
1

Hi :slight_smile:

I’m adding a strobed 850 nm illuminator to an N6 and need the LED on only
during the sensor’s integration window.

The N6 pin reference says P10 is wired to “the camera sensor’s trigger /
exposure pin”, and notes that “some sensors can use the same pin as a
trigger input or an exposure output”. That output is what I’m after.

I know about IOCTL_SET_TRIGGERED_MODE, but it roughly halves
the frame rate and I need every fps I can get.

  1. Can the PAG7936 drive an exposure/strobe output on P10, or is that pin
    a trigger input only?
  2. If it can, how can I reach it?

Thank you very much in advance.

2

Hi, give me until Wednesday to send a PR for this. I have to add a new trigger mode to support what you’d like to do.

3

Thanks, that’s more than I hoped for. I really appreciate you doing this.

4

Haven’t forgotten about this, will get to it.

5

See here for binaries: Add PAG7936 Trigger Output · Issue #3193 · openmv/openmv · GitHub

PR is out: drivers/sensors: Add PAG7936 strobe mode support. by kwagyeman · Pull Request #3237 · openmv/openmv · GitHub

6

Thanks for adding this so quickly, much appreciated!

And regarding the new video about the “Hardware-in-the-Loop Server Rack”:

  • Am I correct in assuming that the ST VL53L9CX is being integrated? That would be great.
  • Is it possible to roughly estimate how long it takes to send a frame using an MM8108 on the N6? Of course, this depends heavily on the content, but just as a rough guide.

Thank you very much!

7
  1. Yes, I have a dual camera and VL53L9CX that I am working on. However, work on it is behind other tasks right now.
  2. The bitrates were published. You can stream 1080p video after H.264 compression. It’s on a completely different level of performance than LoRa.