From 502eeffa9f5ebeec092be1954efeab4992ef9796 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Mon, 22 Oct 2012 20:33:05 -0400
Subject: analog: adding dpll_bb to gr-analog.
---
gr-analog/lib/dpll_bb_impl.cc | 98 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 gr-analog/lib/dpll_bb_impl.cc
(limited to 'gr-analog/lib/dpll_bb_impl.cc')
diff --git a/gr-analog/lib/dpll_bb_impl.cc b/gr-analog/lib/dpll_bb_impl.cc
new file mode 100644
index 0000000000..a199b66b4e
--- /dev/null
+++ b/gr-analog/lib/dpll_bb_impl.cc
@@ -0,0 +1,98 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2009,2010 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 "dpll_bb_impl.h"
+#include <gr_io_signature.h>
+#include <cstdio>
+
+namespace gr {
+ namespace analog {
+
+ dpll_bb::sptr
+ dpll_bb::make(float period, float gain)
+ {
+ return gnuradio::get_initial_sptr
+ (new dpll_bb_impl(period, gain));
+ }
+
+ dpll_bb_impl::dpll_bb_impl(float period, float gain)
+ : gr_sync_block("dpll_bb",
+ gr_make_io_signature(1, 1, sizeof(char)),
+ gr_make_io_signature(1, 1, sizeof(char))),
+ d_restart(0), d_pulse_phase(0)
+ {
+ d_pulse_frequency = 1.0/period;
+ d_gain = gain;
+ d_decision_threshold = 1.0 - 0.5*d_pulse_frequency;
+#if 0
+ fprintf(stderr,"frequency = %f period = %f gain = %f threshold = %f\n",
+ d_pulse_frequency,
+ period,
+ d_gain,
+ d_decision_threshold);
+#endif
+ }
+
+ dpll_bb_impl::~dpll_bb_impl()
+ {
+ }
+
+ int
+ dpll_bb_impl::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const char *iptr = (const char*)input_items[0];
+ char *optr = (char*)output_items[0];
+
+ for(int i = 0; i < noutput_items; i++) {
+ optr[i]= 0;
+ if(iptr[i] == 1) {
+ if(d_restart == 0) {
+ d_pulse_phase = 1;
+ }
+ else {
+ if(d_pulse_phase > 0.5)
+ d_pulse_phase += d_gain*(1.0-d_pulse_phase);
+ else
+ d_pulse_phase -= d_gain*d_pulse_phase;
+ }
+ d_restart = 3;
+ }
+ if(d_pulse_phase > d_decision_threshold) {
+ d_pulse_phase -= 1.0;
+ if(d_restart > 0) {
+ d_restart -= 1;
+ optr[i] = 1;
+ }
+ }
+ d_pulse_phase += d_pulse_frequency;
+ }
+ return noutput_items;
+ }
+
+ } /* namespace analog */
+} /* namespace gr */
--
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