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/* -*- c++ -*- */
/*
* Copyright 2004,2010,2013 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 "check_lfsr_32k_s_impl.h"
#include <gnuradio/io_signature.h>
#include <stdlib.h>
#include <stdio.h>
namespace gr {
namespace blocks {
check_lfsr_32k_s::sptr
check_lfsr_32k_s::make()
{
return gnuradio::get_initial_sptr
(new check_lfsr_32k_s_impl());
}
check_lfsr_32k_s_impl::check_lfsr_32k_s_impl()
: sync_block("check_lfsr_32k",
io_signature::make(1, 1, sizeof(short)),
io_signature::make(0, 0, 0)),
d_state(SEARCHING), d_history(0), d_ntotal(0), d_nright(0),
d_runlength(0), d_index(0)
{
lfsr_32k lfsr;
for(int i = 0; i < BUFSIZE; i++)
d_buffer[i] = lfsr.next_short();
enter_SEARCHING();
}
check_lfsr_32k_s_impl::~check_lfsr_32k_s_impl()
{
}
int
check_lfsr_32k_s_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
unsigned short *in = (unsigned short*)input_items[0];
for(int i = 0; i < noutput_items; i++) {
unsigned short x = in[i];
unsigned short expected;
switch(d_state) {
case MATCH0:
if(x == d_buffer[0])
enter_MATCH1();
break;
case MATCH1:
if(x == d_buffer[1])
enter_MATCH2();
else
enter_MATCH0();
break;
case MATCH2:
if(x == d_buffer[2])
enter_LOCKED();
else
enter_MATCH0();
break;
case LOCKED:
expected = d_buffer[d_index];
d_index = d_index + 1;
if(d_index >= BUFSIZE)
d_index = 0;
if(x == expected)
right();
else {
wrong();
log_error(expected, x);
if(wrong_three_times())
enter_SEARCHING();
}
break;
default:
abort();
}
d_ntotal++;
}
return noutput_items;
}
void
check_lfsr_32k_s_impl::enter_SEARCHING()
{
d_state = SEARCHING;
wrong(); // reset history
wrong();
wrong();
d_runlength = 0;
d_index = 0; // reset LFSR to beginning
if(0)
fprintf(stdout, "check_lfsr_32k: enter_SEARCHING at offset %8ld (0x%08lx)\n",
d_ntotal, d_ntotal);
enter_MATCH0();
}
void
check_lfsr_32k_s_impl::enter_MATCH0()
{
d_state = MATCH0;
}
void
check_lfsr_32k_s_impl::enter_MATCH1()
{
d_state = MATCH1;
}
void
check_lfsr_32k_s_impl::enter_MATCH2()
{
d_state = MATCH2;
}
void
check_lfsr_32k_s_impl::enter_LOCKED()
{
d_state = LOCKED;
right(); // setup history
right();
right();
d_index = 3; // already matched first 3 items
if(0)
fprintf(stdout, "check_lfsr_32k: enter_LOCKED at offset %8ld (0x%08lx)\n",
d_ntotal, d_ntotal);
}
void
check_lfsr_32k_s_impl::log_error(unsigned short expected, unsigned short actual)
{
if(0)
fprintf(stdout,
"check_lfsr_32k: expected %5d (0x%04x) got %5d (0x%04x) offset %8ld (0x%08lx)\n",
expected, expected, actual, actual, d_ntotal, d_ntotal);
}
} /* namespace blocks */
} /* namespace gr */
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