Reply by Torgeir Jakobsen●February 5, 20022002-02-05
Hi
I have checked the size of the sintab table. The complete size is 1517 words
or
3034 bytes.
Best regards
Torgeir Jakobsen
Senior Engineer, Technology Department
Aanderaa Instruments AS
e-mail:
web: www.aanderaa.com
phone; +47 55 10 99 00
direct: +47 55 10 99 77
fax: +47 55 10 99 10
----- Original Message -----
From: "Mikhail Fridberg" <>
To: <>
Sent: Monday, February 04, 2002 7:39 PM
Subject: Re: [c54x] size of FFT code from DSPLIB
> I don't know for sure, but it seems to be
highly unlikely that sin table
> would occupy over 4kbytes (2kwords) of space. I'd expect it to be
in order > of 256-512 bytes or less.
>
> Mike.
>
> On 2/4/02 11:22 AM, "Torgeir Jakobsen" <> wrote: >
> > Hi
> >
> > It is probably the .sintab section. If you look in your .map file,
you will > > see that
> > a .sintab section is included if you use the cfft. If you look at
the cfft > > source code,
> > you will see that it includes a sintab.q15 file which is used for
the FFT. > >
> >
> > Best regards
> > Torgeir Jakobsen
> > Senior Engineer, Technology Department
> > Aanderaa Instruments AS
> > e-mail:
> > web: www.aanderaa.com
> > phone; +47 55 10 99 00
> > direct: +47 55 10 99 77
> > fax: +47 55 10 99 10
>
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Reply by Jeff Brower●February 4, 20022002-02-04
Wei Wen Dai-
>I am using the cfft and rfft functions from the
TI's DSPLIB.
>It is mentioned in TI's App Notes (SPRU518) that the code size of
>both functions is about 370 words (plus anoth 360 words for the
>sintab). However, my output code size increases by nearly 5K if I use
>once either of these two functions.
>
>Does anyone know the reason behind this ?
Is it possible that including the cfft and rfft functions in turn cause some
additional functions from rts.lib, rts_ext.lib, or other C5000 library files
to
be included in your build?
Jeff Brower
DSP sw/hw engineer
Signalogic
Reply by Mikhail Fridberg●February 4, 20022002-02-04
I don't know for sure, but it seems to be highly unlikely that sin
table
would occupy over 4kbytes (2kwords) of space. I'd expect it to be in
order
of 256-512 bytes or less.
Mike.
On 2/4/02 11:22 AM, "Torgeir Jakobsen" <> wrote:
> Hi
>
> It is probably the .sintab section. If you look in your .map file, you
will
> see that
> a .sintab section is included if you use the cfft. If you look at the
cfft
> source code,
> you will see that it includes a sintab.q15 file which is used for the FFT.
> Best regards
> Torgeir Jakobsen
> Senior Engineer, Technology Department
> Aanderaa Instruments AS
> e-mail:
> web: www.aanderaa.com
> phone; +47 55 10 99 00
> direct: +47 55 10 99 77
> fax: +47 55 10 99 10
Reply by Torgeir Jakobsen●February 4, 20022002-02-04
Hi
It is probably the .sintab section. If you look in your .map file, you will
see that
a .sintab section is included if you use the cfft. If you look at the cfft
source code,
you will see that it includes a sintab.q15 file which is used for the FFT.
Best regards
Torgeir Jakobsen
Senior Engineer, Technology Department
Aanderaa Instruments AS
e-mail:
web: www.aanderaa.com
phone; +47 55 10 99 00
direct: +47 55 10 99 77
fax: +47 55 10 99 10
----- Original Message -----
From: "wei_wen_dai" <>
To: <>
Sent: Saturday, February 02, 2002 6:13 AM
Subject: [c54x] size of FFT code from DSPLIB
> Hi all,
>
> I am using the cfft and rfft functions from the TI's DSPLIB.
> It is mentioned in TI's App Notes (SPRU518) that the code size of
> both functions is about 370 words (plus anoth 360 words for the
> sintab). However, my output code size increases by nearly 5K if I use
> once either of these two functions.
>
> Does anyone know the reason behind this ?
>
> Thank you very much.
>
> Dww
> Knowles Electronics Inc.
>
> _____________________________________
> Note: If you do a simple "reply" with your email client, only the
author of this message will receive your answer. You need to do a "reply
all" if
you want your answer to be distributed to the entire group. >
> _____________________________________
> About this discussion group:
>
> To Join: Send an email to
>
> To Post: Send an email to
>
> To Leave: Send an email to
>
> Archives: http://www.yahoogroups.com/group/c54x
>
> Other Groups: http://www.dsprelated.com
> ">http://docs.yahoo.com/info/terms/
Reply by wei_wen_dai●February 2, 20022002-02-02
Hi all,
I am using the cfft and rfft functions from the TI's DSPLIB.
It is mentioned in TI's App Notes (SPRU518) that the code size of
both functions is about 370 words (plus anoth 360 words for the
sintab). However, my output code size increases by nearly 5K if I use
once either of these two functions.