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/* -*- c++ -*- */
/*
* Copyright 2008 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gcp_fft_1d_r2.h>
#include <stdint.h>
#include <stdexcept>
#include <math.h>
static void
init_jd(gc_job_desc *jd,
gc_proc_id_t proc_id,
unsigned log2_fft_length,
bool forward,
std::complex<float> *out,
const std::complex<float> *in,
const std::complex<float> *W)
{
jd->proc_id = proc_id;
jd->input.nargs = 2;
jd->output.nargs = 0;
jd->eaa.nargs = 3;
jd->input.arg[0].u32 = log2_fft_length;
jd->input.arg[1].u32 = forward;
unsigned int fft_length = 1 << log2_fft_length;
jd->eaa.arg[0].ea_addr = ptr_to_ea(out);
jd->eaa.arg[0].direction = GCJD_DMA_PUT;
jd->eaa.arg[0].put_size = sizeof(std::complex<float>) * fft_length;
jd->eaa.arg[1].ea_addr = ptr_to_ea(const_cast<std::complex<float>*>(in));
jd->eaa.arg[1].direction = GCJD_DMA_GET;
jd->eaa.arg[1].get_size = sizeof(std::complex<float>) * fft_length;
jd->eaa.arg[2].ea_addr = ptr_to_ea(const_cast<std::complex<float>*>(W));
jd->eaa.arg[2].direction = GCJD_DMA_GET;
jd->eaa.arg[2].get_size = sizeof(std::complex<float>) * fft_length / 4;
}
gc_job_desc *
gcp_fft_1d_r2_submit(gc_job_manager_sptr mgr,
unsigned int log2_fft_length,
bool forward,
std::complex<float> *out,
const std::complex<float> *in,
const std::complex<float> *W)
{
unsigned int fft_length = 1 << log2_fft_length;
if (fft_length > 4096)
throw std::invalid_argument("fft_length > 4096");
if ((intptr_t)out & 0xf)
throw gc_bad_align("out");
if ((intptr_t)in & 0xf)
throw gc_bad_align("in");
if ((intptr_t)W & 0xf)
throw gc_bad_align("W");
gc_proc_id_t fft_id = mgr->lookup_proc("fft_1d_r2");
gc_job_desc *jd = mgr->alloc_job_desc();
init_jd(jd, fft_id, log2_fft_length, forward, out, in, W);
if (!mgr->submit_job(jd)){
gc_job_status_t s = jd->status;
mgr->free_job_desc(jd);
throw gc_bad_submit("fft_1d_r2", s);
}
return jd;
}
void
gcp_fft_1d_r2_twiddle(unsigned int log2_fft_length, std::complex<float> *W)
{
unsigned int n = 1 << log2_fft_length;
W[0].real() = 1.0;
W[0].imag() = 0.0;
for (unsigned i=1; i < n/4; i++){
W[i].real() = cos(i * 2*M_PI/n);
W[n/4 - i].imag() = -W[i].real();
}
}
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