24-bit histogramming (memory issues)

Hi all

I'm trying to create a histogram 24 bits of code for a 24-bit ADC. For further processing of these data, I need all of the bins to be stored, i.e. I found that the histogram in the functions palette VI will not work for 24 bits of data, I'm LV 2010 but on 32-bit Windows XP, (with ~ 4 of RAM)

The histogram vi meets memory problems with my data.

Even at a more basic level if I try init an empty array with 2 ^ 24 U32 elements (and therefore 16 M elements in the table) each index of the array represents a code adc and is incremented each time it is acquired. When I initialize and start using such a table I get "out of memory". I would have thought that 16 M elements was not a huge group of data and it is not difficult to find of 16 MB of memory contiguous with allocation of 2G of the application by the operating system.

I was wondering if anyone had a proper of the present explanation or she might suggest a way around this problem.

Thank you

dsone1

I would change one or two things:

  1. As the shift register is not initialized, the memory usage will be low until the first time that the VI is run in the init mode, date to be allocated to run the memory. It is preferable to assign at compile time as in my modification.
  2. I would recommend an initialized overall feedback node, eliminating the while loop. It also provides an initialized array if the user forgets first run init. (the implementation of the same with a shift register would need also the ' premiere' primitive?).
  3. I move the code init before the code of the histogram, which allows to init and calculate a new histogram at the same time.

Here's a rough draft

Tags: NI Software

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