manual trigger in IEEE1394 image sequence acquisition - vision

[fink]

Hello

I'd like to run an image acquisition under IEEE1394 with about 2000 buffers continuously and then "tag" the acquisition with a manual trigger (mouse click or whatever).

The idea is to run continuous acquisition in the 2000 buffers, allowing rewriting the buffer if not interesting ("barrel-like" buffers)

When the "manual event" arises, I want to record N images before the manual trigger and the rest of the buffers after the trigger.

Any idea on how doing this or existing code would be fine...

Best regards to all

Finksteet

[TiTou]

Hi,

Have you had a look at the Low Level IMAQ Triggered examples ?
Combining then you should be able to do this.

I'll have a look if there is an example that does exactly this.

[TiTou]

A quick try... I didn't test this VI because I don't have a framegrabber and a camera here at the moment, but it shouldn't be far from working as you described.

The "configure list" configures a "rotating buffer" so that only the last 100 images acquired are in the extractable buffer.
When you click "start from now, it gets the current frame index and stops after acquiring the 100 images.
If you want to take N image before you clicked, you merely have to substract "N" to the "when to stop" index.

Hope this helps and is not to "buggy"

Good luck

[fink]

I was talking about "Manual trigger" and not external or RTSI triggering the IEEE1394 driver

I keep on checking it..

[fink]

Ok I will try this vi; your answer and my remark just come together on the forum,

thanks

[TiTou]

Hooops... sorry, I just realized you asked it in IEEE1394... not even a chance my VI works with your hardware..

But using the same concept, and replacing all the IMAQ functions I used with IMAQ 1394 functions (unfortunately they are not exactly the same) it should work as well.

Good luck and sorry about that mistake... I went too fast

[fink]

Hi there,

...not a chance in IEEE1394. The function "Extract buffer" s not implemented and then if you "Get Image 1394" after 'pre and post trig' selection, it is too late, the buffers are overwritten. IMAQ do the job , but not IMAQ1394 vers.2.0.1. Even if you stop acquisition after buffer selection, then "Get Image 1394" says" No acquisition under progress" ...

Just for memory allocation (large number of buffers, near to RAM maximum) we have to wait for the Upgrade.

Hey NI engineers, is it done in the last IEEE1394 drivers ??? Would be fun doinit

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