Discussion in "ARM Development" started by    DaniVivek    Oct 21, 2013.
Mon Oct 21 2013, 11:32 pm
#1
Hi

I am having a LPC3250 embedded artists developer's kit. I need to implement fast fourier transform for audio samples to get frequency spectrum. As I searched in Internet, it seems LPC3250 has Vector Floating Point Coprocessor. Will it be able to support my requirement in real time ? As I am new to ARM board implementation provide me ideas for the same. Any DSP examples on LPC3250 will be very useful.

Regards
Dani Vivek
Tue Oct 22 2013, 01:21 pm
#2
which toolchain are you using? are you using linux? There are many fft libraries are available.
check this:
http://www.fftw.org/
http://www.lartmaker.nl/projects/fft-arm/
http://www.embeddedsignals.com/ARM.htm
Tue Oct 22 2013, 10:32 pm
#3
Hi Ajay

Thank you for your reply.
I have not yet started working on the project. I have worked little on IAR and KEIL environment. I am learning few tutorials to work on these tool chains. I am having a doubt, kindly clarify me, if I am directly using these C files, will it use the vector floating point coprocessor in lpc3250 ? All ARM processors do not have floating point coprocessor, so does that mean even without dedicated floating point coprocessor ARM processor can be used for FFT like DSP algorithms ??

My algorithm has sample rate of audio signal is 44.1 kHz, 2 channel and 16 bits per channel. The board clocking speed is 13 MHz. Will I be able to process audio in real time doing those fft in the input data ?

Thanks in advance.

Regards
Dani Vivek
Wed Oct 23 2013, 01:12 pm
#4
when you have VFP co-processor you need to provide a switch in toolchain telling that VFP is available. thats it. rest everything will be taken are automatically. with no VFP core, processor uses soft float libraries to do all floating calculations.
I think you should not have any problem doing FFT. But you need to try it to know it.

Read this document for configuring Keil, IAR and gcc for VFP support.
Wed Oct 23 2013, 11:09 pm
#5
Hi Ajay

Thank you very much for your valuable information.

Regards
Dani Vivek
Thu Oct 24 2013, 02:51 pm
#6
You're welcome

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