How to save data in 4-bit mode instead of U8

Question

Hi
I use LabVIEW to acquire and save data through the counter timer PCI6602.
My signals are really low so the data can be expressed in 4-bits (0-15).
I have used the conversion to U8 and write them using "Write Binary Files"
So this uses 1 byte for each data point but I would like to reduce it to 4bit (half byte) for each data point.
Can anyone help me with this?
I am attaching my program for reference 
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Attachments:
DAQ-longvector1.vi ‏64 KB

Answer 1

Here's some easy code how to do it.
Note that this code assumes that the data is 4bit (0..15). If any of the upper 4 bit are set, you've got problems, of course
See if this makes sense. Good luck.
This example uses a single 1D array. You would eliminate the decimate/interleave and just use the two arrays.
A small comment to your code. There are a few weird constructs, but the use of two "split array" operations to take a simple derivative seems overkill. This made a honorary mention in the Rube Goldberg Hall of Fame.
Message Edited by altenbach on 12-04-2008 05:18 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
8bitTo4bit.png ‏18 KB