Error 1074388947 at CAN Open Object, Exceed resource limit

[lraynal]

Dear All,

Basically, I'm listening to 5 frames from NI-CAN, and I can't listen to the sixth...

To be more precise, I'm listening to STAT1, STAT2, EXT1, EXT2 and I'm sending commands to CMD.

When I try to add a "hearing" on the BITE frame, I obtain the error:

"1074388947 occured at NI-CAN Open Object (ncOpen.vi)

NI-CAN: Exceeded resource limit for queues in shared memory between firmware/driver. The ncReadmult function is not allowed. Solutions: Decrease queue lengths in objects; Set read queue length to at least 2; Decrease number of CAN Objects."

I can't see any significative parameter to change...

I'm doing a ncConfigCANNET + ncOpen + ncSetAttr, then for each frames: ncConfigCANObj + ncOpen + ncSetAttr + ncCreateOccur.

That's when I'm adding the sixth frame's part, I get the error at the output of the ncOpen.

Does someone knows what's happening ?

Thanks for any help you could give me, even if it's just a thought... Thanks in advance ! I'm quite desperate actually...

Laurent

[johan G.]

Hi,
This is a KB wich could help.
http://digital.ni.com/public.nsf/allkb/CC36BA1DD421EC23862569060054F6E2?OpenDocument

[lraynal]

Thanks Johan,
Your link helped me a lot !
My problem (theoricaly, because I can't test it right now...) comes from an overflow of memory in the CAN card.

Memory_used = (( Queue_length +1) x Entry_size) + 30
with Entry_size equal to 8 for command frames and 16 for reading frames.

All together was above 6600 which is the memory size available.
I just need to reduce the Queue_length, but now I know how many to reduce !!!!
Cheers,
Laurent