109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2010, 2011, 2012, 2013 KA1RBI
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "fsk4_slicer_fb_impl.h"
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#include <stdio.h>
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namespace gr {
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namespace op25_repeater {
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fsk4_slicer_fb::sptr
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fsk4_slicer_fb::make(const std::vector<float> &slice_levels)
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{
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return gnuradio::get_initial_sptr
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(new fsk4_slicer_fb_impl(slice_levels));
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}
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static const int MIN_IN = 1; // mininum number of input streams
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static const int MAX_IN = 1; // maximum number of input streams
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static const int MIN_OUT = 1; // minimum number of output streams
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static const int MAX_OUT = 1; // maximum number of output streams
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/*
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* The private constructor
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*/
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fsk4_slicer_fb_impl::fsk4_slicer_fb_impl(const std::vector<float> &slice_levels)
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: gr::sync_block("fsk4_slicer_fb",
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gr::io_signature::make (MIN_IN, MAX_IN, sizeof (float)),
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gr::io_signature::make (MIN_OUT, MAX_OUT, sizeof (unsigned char)))
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{
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d_slice_levels[0] = slice_levels[0];
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d_slice_levels[1] = slice_levels[1];
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d_slice_levels[2] = slice_levels[2];
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d_slice_levels[3] = slice_levels[3];
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}
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/*
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* Our virtual destructor.
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*/
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fsk4_slicer_fb_impl::~fsk4_slicer_fb_impl()
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{
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}
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int
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fsk4_slicer_fb_impl::work (int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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const float *in = (const float *) input_items[0];
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unsigned char *out = (unsigned char *) output_items[0];
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for (int i = 0; i < noutput_items; i++){
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#if 0
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if (in[i] < -2.0) {
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out[i] = 3;
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} else if (in[i] < 0.0) {
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out[i] = 2;
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} else if (in[i] < 2.0) {
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out[i] = 0;
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} else {
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out[i] = 1;
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}
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#endif
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uint8_t dibit;
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float sym = in[i];
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if (d_slice_levels[3] < 0) {
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dibit = 1;
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if (d_slice_levels[3] <= sym && sym < d_slice_levels[0])
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dibit = 3;
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} else {
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dibit = 3;
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if (d_slice_levels[2] <= sym && sym < d_slice_levels[3])
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dibit = 1;
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}
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if (d_slice_levels[0] <= sym && sym < d_slice_levels[1])
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dibit = 2;
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if (d_slice_levels[1] <= sym && sym < d_slice_levels[2])
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dibit = 0;
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out[i] = dibit;
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}
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// Tell runtime system how many output items we produced.
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return noutput_items;
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}
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} /* namespace op25_repeater */
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} /* namespace gr */
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