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From: Eric.Thayer@cs.cmu.edu (Eric H. Thayer)
Newsgroups: comp.sys.next
Subject: Re: Re: Help Needed about DSP C functions...
Message-ID: <1990Nov15.184711.336@cs.cmu.edu>
Date: 15 Nov 90 18:47:11 GMT
References: <26@homer.cs.mcgill.ca>
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Organization: Carnegie Mellon School of Comp. Sci.
Lines: 25


In article <26@homer.cs.mcgill.ca> philwzo@quiche.cs.mcgill.ca (Philippe 
WIECZOREK) writes:
> I did not manage to write a float number greater than 1.0 on the
>         DSP... I think it is a problem of representation between C and
>         DSP. If so, what is the DSP float format ?

Get the 56k User's Manual.  You may find that you will be at a 
disadvantage if you don't get the DSP56000 UM/AD (User's Manual).   
Another helpful document from Motorola is:

     APR3/D "Fractional and Integer Arithmetic Using the DSP56000 Family 
of  General-Purpose Digital Signal Processors"


This explains the "mystery" of the way the 56k represents numbers.  It 
also gives some helpful algorithms for implementing other representations 
given the 56k's primitive representation.




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