163 lines
4.1 KiB
C++
163 lines
4.1 KiB
C++
/* -*- c++ -*- */
|
|
/*
|
|
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
|
|
*
|
|
* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
|
|
*
|
|
* This program 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 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <gnuradio/io_signature.h>
|
|
#include "upsat_fsk_frame_acquisition_impl.h"
|
|
#include <satnogs/log.h>
|
|
|
|
namespace gr
|
|
{
|
|
namespace satnogs
|
|
{
|
|
|
|
upsat_fsk_frame_acquisition::sptr
|
|
upsat_fsk_frame_acquisition::make (const std::vector<uint8_t> &preamble,
|
|
const std::vector<uint8_t> &sync_word,
|
|
bool whitening, bool manchester)
|
|
{
|
|
return gnuradio::get_initial_sptr (
|
|
new upsat_fsk_frame_acquisition_impl (preamble, sync_word, whitening,
|
|
manchester));
|
|
}
|
|
|
|
/*
|
|
* The private constructor
|
|
*/
|
|
upsat_fsk_frame_acquisition_impl::upsat_fsk_frame_acquisition_impl (
|
|
const std::vector<uint8_t> &preamble,
|
|
const std::vector<uint8_t> &sync_word, bool whitening, bool manchester) :
|
|
gr::sync_block ("upsat_fsk_frame_acquisition",
|
|
gr::io_signature::make (1, 1, sizeof(float)),
|
|
gr::io_signature::make (0, 0, 0)),
|
|
d_preamble (preamble),
|
|
d_preamble_len (preamble.size ()),
|
|
d_sync_word (sync_word),
|
|
d_sync_word_len (sync_word.size ()),
|
|
d_state (SEARCHING),
|
|
d_shifting_byte (0x0),
|
|
d_decoded_bytes (0),
|
|
d_frame_len (0)
|
|
{
|
|
message_port_register_out (pmt::mp ("pdu"));
|
|
if (d_preamble_len < 2) {
|
|
throw std::invalid_argument ("Preamble must be at least 2 bytes long");
|
|
}
|
|
|
|
if (d_sync_word_len < 1) {
|
|
throw std::invalid_argument (
|
|
"Synchronization word must be at least 1 byte long");
|
|
}
|
|
|
|
d_pdu = new uint8_t[UPSAT_MAX_FRAME_LEN];
|
|
}
|
|
|
|
/*
|
|
* Our virtual destructor.
|
|
*/
|
|
upsat_fsk_frame_acquisition_impl::~upsat_fsk_frame_acquisition_impl ()
|
|
{
|
|
delete[] d_pdu;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::slice_and_shift (float in)
|
|
{
|
|
uint8_t tmp;
|
|
/* Slice the input into 0 and 1 bits */
|
|
tmp = in > 0 ? 1 : 0;
|
|
d_shifting_byte = d_shifting_byte << 1;
|
|
d_shifting_byte |= tmp;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::reset_state ()
|
|
{
|
|
d_state = SEARCHING;
|
|
d_decoded_bytes = 0;
|
|
d_shifting_byte = 0;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::have_preamble ()
|
|
{
|
|
d_state = HAVE_PREAMBLE;
|
|
d_decoded_bytes = 1;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::have_sync ()
|
|
{
|
|
d_state = HAVE_SYNC_WORD;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::have_frame_len ()
|
|
{
|
|
d_state = HAVE_FRAME_LEN;
|
|
}
|
|
|
|
inline void
|
|
upsat_fsk_frame_acquisition_impl::have_payload ()
|
|
{
|
|
d_state = HAVE_PAYLOAD;
|
|
}
|
|
|
|
int
|
|
upsat_fsk_frame_acquisition_impl::work (
|
|
int noutput_items, gr_vector_const_void_star &input_items,
|
|
gr_vector_void_star &output_items)
|
|
{
|
|
int i;
|
|
const float *in = (const float *) input_items[0];
|
|
for (i = 0; i < noutput_items; i++) {
|
|
slice_and_shift (in[i]);
|
|
switch (d_state)
|
|
{
|
|
case SEARCHING:
|
|
if (d_shifting_byte == d_preamble[0]) {
|
|
have_preamble ();
|
|
}
|
|
break;
|
|
case HAVE_PREAMBLE:
|
|
break;
|
|
case HAVE_SYNC_WORD:
|
|
break;
|
|
case HAVE_PAYLOAD:
|
|
if (d_decoded_bytes == d_frame_len) {
|
|
message_port_pub (pmt::mp ("pdu"),
|
|
pmt::make_blob (d_pdu, d_frame_len));
|
|
}
|
|
break;
|
|
default:
|
|
LOG_WARN("Unknown decoding state");
|
|
}
|
|
}
|
|
|
|
return noutput_items;
|
|
}
|
|
|
|
} /* namespace satnogs */
|
|
} /* namespace gr */
|
|
|