While I don't need this now, I will file it away because I just know I'll
need it someday. Many thanks for posting the results of your search.
Norm
----- Original Message -----
From: Miguel Saiz Arnedo <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 10, 2002 6:27 AM
Subject: Re: [rtl] FFT functions in RTLinux
> Hello.
>
> I respond myself to say that with Mr.Hofrats help I've found a pckage of
fft
> functions that will work in rt_threads.
>
> The link is ftp://ftp.fsmlabs.at:/pub/rtlinux/math/fft.tar.bz2
>
> It contains various files including a readme which is a good starting
point. The
> fft functions are in fft_mayer.c. Here you can find:
> fft(n,real,imag),ifft(n,real,imag) which calculates the complex direct
and
> inverse fft transform over the complex vector real+j*imag of n elements.
It
> returns results in the same vectors. It must be noted that ifft gives an
> unnormalized result so that the execution of ifft(fft(v)) will return
same
> vector v multiplied by the number of points.
> I haven't used the rest of the functions defined but I guess they work in
a
> similar way.
> Note that fft_mayer.c includes the header file trigtbl.h (which comes in
the
> package) so make sure you have it in hand when compiling.
> For copyright info see in fft_mayer.c.
>
> Missatge citat per: Miguel Saiz Arnedo <[EMAIL PROTECTED]>:
>
> > Hello.
> >
> > I need to call fft (fast fourier transform) functions in my rtthreads.
I
> > found
> > in the internet a packet of fft functions called FFTW which I've been
> > using in
> > normal linux without any problems. FFTW uses math functions so you must
> > be link
> > your programs with -lm, in addition to -lfftw.
> > But when I try to call FFTW from rtthreads I get some problems. In
> > inserting the
> > module y get some unresolved symbols in functions like malloc, fflush,
> > free,
> > exit, stderr, stdout, fprintf, sprintf. Does this mean that FFTW can't
> > be used
> > in RTLinux?
> > Anyway, I can get rid of those unresolved symbols by linking in de C
> > library
> > -lc. But I get some new unresolved symbols in --udivdi3, --umoddi3 and
> > --moddi3
> > (this last one isn't new). How can I get rid of those?
> > If the final conclusion is that I can't use FFTW in rtlinux, does
anyone
> > know
> > about some pack of fft functions which will work?
> >
> > Thanks in advance and best regards.
> >
> > Miguel.
> > -- [rtl] ---
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> >
> >
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