2D FFT and 2D IFFT

garnett garnett

Prodigy 40 points

Other Parts Discussed in Thread: FFTLIB

Hello, everyone

I want to implement 2D FFT and 2D IFFT on the C6657 dsp, but I don't known how to do.

I have already try below code, but get incorrect result.

ref : http://processors.wiki.ti.com/index.php/FFT/IFFT:_2D_Implementation

please help me, thanks.

garnett

over 9 years ago

0 Raja over 9 years ago

TI__Guru* 81335 points

Hi Garnett,

Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com). Please refer links below my signauture.

We will get back to you on above post.

0 one and zero over 9 years ago in reply to Raja

TI__Genius 17676 points

Hi Garnett,

you can find the DSPLib for c66x devices here:

http://software-dl.ti.com/sdoemb/sdoemb_public_sw/dsplib/latest/index_FDS.html

Kind regards,

one and zero

0 garnett garnett over 9 years ago in reply to one and zero

Prodigy 40 points

Sorry, I have already download DSPLib for c66x devices, but I don't known how to use 2D FFT and 2D IFFT.

Do you have 2D FFT and 2D IFFT sample code for C6657 ???

0 one and zero over 9 years ago in reply to garnett garnett

TI__Genius 17676 points

Hi Garnett,

The principle is the same as for 64x+. Just use the example you were already referring to and use it with DSPLib for c66x.

The linker command file needs to be adapted to C6657. I'd start a new CCS project using the sources you find in the .zip package and work it from there ...

Kind regards,

one and zero

0 Asheesh Bhardwaj over 9 years ago in reply to one and zero

TI__Expert 4680 points

The FFT library is available for running the 2D FFT on TI multicore DSPs.

http://www.ti.com/tool/FFTLIB

Regards,

Asheesh

0 Anders Klint over 9 years ago in reply to Asheesh Bhardwaj

Intellectual 620 points

Asheesh,

Like the OP I try to get started with fft, but I'm trying to use fftlib.

However, I struggle with getting a grip on the documentation (from /docs dir in install tree). When looking for examples the docs refer to units tests, but I don't find any - am I looking in the wrong place? Specifically, I would like to make a double, 1D, real-to-complex 512 point fft. How do I set this up? I assume with fft_dp_plan_1d_r2c(...) and fft_dp_1d_r2c(...), but what do I give to fft_plan...() ? Do I fill in the fft_callout_t passed to fft_plan, or is it filled in by the callee? An example would be greatly appreciated!

Regards /Anders

0 Asheesh Bhardwaj over 9 years ago in reply to Anders Klint

TI__Expert 4680 points

In FFTlib each kernel has a CCS project which serves as an example and it is mentioned in the document. The document is based of doxygen.

For example the path for fft_dp_1d_2c project is in below path which be imported into CCS workspace.

\fftlib_k2hx_2_0_0_2\packages\ti\fftlib\src\fft_dp_1d_c2c\k2h\fft_dp_1d_c2c_k2h_66_LE_ELF

Regards

Asheesh

Processors

Processors forum

2D FFT and 2D IFFT