From 9dbc8b75787e4a6d493251826c0436f9af167a6d Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Wed, 31 Oct 2012 15:06:23 -0400
Subject: analog: adding rail_ff block to gr-analog with QA and GRC.
---
gr-analog/lib/rail_ff_impl.cc | 91 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
create mode 100644 gr-analog/lib/rail_ff_impl.cc
(limited to 'gr-analog/lib/rail_ff_impl.cc')
diff --git a/gr-analog/lib/rail_ff_impl.cc b/gr-analog/lib/rail_ff_impl.cc
new file mode 100644
index 0000000000..106c6353ae
--- /dev/null
+++ b/gr-analog/lib/rail_ff_impl.cc
@@ -0,0 +1,91 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "rail_ff_impl.h"
+#include <gr_io_signature.h>
+#include <gr_math.h>
+
+namespace gr {
+ namespace analog {
+
+ rail_ff::sptr
+ rail_ff::make(float lo, float hi)
+ {
+ return gnuradio::get_initial_sptr
+ (new rail_ff_impl(lo, hi));
+ }
+
+ rail_ff_impl::rail_ff_impl(float lo, float hi)
+ : gr_sync_block("rail_ff",
+ gr_make_io_signature(1, 1, sizeof(float)),
+ gr_make_io_signature(1, 1, sizeof(float))),
+ d_lo(lo), d_hi(hi)
+ {
+ set_clipping();
+ }
+
+ rail_ff_impl::~rail_ff_impl()
+ {
+ }
+
+ void
+ rail_ff_impl::set_lo(float lo)
+ {
+ d_lo = lo;
+ set_clipping();
+ }
+
+ void
+ rail_ff_impl::set_hi(float hi)
+ {
+ d_hi = hi;
+ set_clipping();
+ }
+
+ void
+ rail_ff_impl::set_clipping()
+ {
+ d_mid = (d_lo + d_hi)/2;
+ d_clip = d_hi - d_mid;
+ }
+
+ int
+ rail_ff_impl::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const float *in = (const float*)input_items[0];
+ float *out = (float*)output_items[0];
+
+ for(int i = 0; i < noutput_items; i++) {
+ out[i] = d_mid + gr_branchless_clip(in[i] - d_mid, d_clip);
+ }
+
+ return noutput_items;
+ }
+
+ } /* namespace analog */
+} /* namespace gr */
--
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