1 files changed, 119 insertions, 0 deletions
diff --git a/gcell/lib/wrapper/gcp_fft_1d_r2.cc b/gcell/lib/wrapper/gcp_fft_1d_r2.cc
new file mode 100644
index 000000000..9e7e00f49
--- /dev/null
+++ b/gcell/lib/wrapper/gcp_fft_1d_r2.cc
@@ -0,0 +1,119 @@
+/* -*- 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 <gcell/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 shift,
+	std::complex<float> *out,
+	const std::complex<float> *in,
+	const std::complex<float> *twiddle,
+	const float *window)
+{
+  jd->proc_id = proc_id;
+  jd->input.nargs = 2;
+  jd->output.nargs = 0;
+  jd->eaa.nargs = 4;
+
+  jd->input.arg[0].u32 = log2_fft_length;
+  jd->input.arg[1].u32 = shift;
+  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>*>(twiddle));
+  jd->eaa.arg[2].direction = GCJD_DMA_GET;
+  jd->eaa.arg[2].get_size = sizeof(std::complex<float>) * fft_length / 4;
+
+  jd->eaa.arg[3].ea_addr = ptr_to_ea(const_cast<float*>(window));
+  jd->eaa.arg[3].direction = GCJD_DMA_GET;
+  if (window == 0)
+    jd->eaa.arg[3].get_size = 0;
+  else
+    jd->eaa.arg[3].get_size = sizeof(float) * fft_length;
+}
+
+  
+gc_job_desc_sptr
+gcp_fft_1d_r2_submit(gc_job_manager_sptr mgr,
+		     unsigned int log2_fft_length,
+		     bool forward,
+		     bool shift,
+		     std::complex<float> *out,
+		     const std::complex<float> *in,
+		     const std::complex<float> *twiddle,
+		     const float *window)
+{
+  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)twiddle & 0xf)
+    throw gc_bad_align("twiddle");
+  if ((intptr_t)window & 0xf)
+    throw gc_bad_align("window");
+
+  std::string proc_name;
+  if (forward)
+    proc_name = "fwd_fft_1d_r2";
+  else
+    proc_name = "inv_fft_1d_r2";
+
+  gc_proc_id_t fft_id = mgr->lookup_proc(proc_name);
+  gc_job_desc_sptr jd = gc_job_manager::alloc_job_desc(mgr);
+  init_jd(jd.get(), fft_id, log2_fft_length, shift, out, in, twiddle, window);
+  if (!mgr->submit_job(jd.get())){
+    gc_job_status_t s = jd->status;
+    throw gc_bad_submit(proc_name, s);
+  }
+  return jd;
+}
+
+void
+gcp_fft_1d_r2_twiddle(unsigned int log2_fft_length, std::complex<float> *twiddle)
+{
+  unsigned int n = 1 << log2_fft_length;
+
+  twiddle[0].real() = 1.0;
+  twiddle[0].imag() = 0.0;
+  for (unsigned i=1; i < n/4; i++){
+    twiddle[i].real() =  cos(i * 2*M_PI/n);
+    twiddle[n/4 - i].imag() = -twiddle[i].real();
+  }
+}