Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 15 Mar 2011 10:35:18 -0600

Hi Graham,

On Tuesday 15 March 2011 11:07:22 [email protected] wrote:
> Should it not be the case that I can store the number of sample allocated
> in MALM?  Otherwise I will be allocating memory which I will never be
> using, in this case double the amount required in subArray 2 as MALM must
> equal (INDX + NELM) rather than simply NELM.
>
> Clearly I can get the system operating by setting MALM sufficiently high in
> subArray 2, but it seems that MALM isn't quite doing what it would be
> expected to do?

Unfortunately the API that the subArray device support uses to fetch the data 
from the waveform record does not include an offset parameter, so the code has 
to fetch the whole array and then dump the first INDX elements.  This is a 
limitation of the current dbGetLink() routine.  I could see ways to get around 
it, but nobody has tried writing the necessary code yet, so currently you will 
have to set your subArray 2's NELM field to the size of the waveform record.

HTH,

- Andrew
-- 
An error is only a mistake if you don't learn from it.
When you learn something from it, it becomes a lesson.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System