130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
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/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
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*
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* This program 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 of the License, or
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* (at your option) any later version.
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*
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* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
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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 "upsat_fsk_frame_encoder_impl.h"
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#include <satnogs/log.h>
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namespace gr
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{
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namespace satnogs
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{
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upsat_fsk_frame_encoder::sptr
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upsat_fsk_frame_encoder::make (const std::vector<uint8_t>& preamble,
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const std::vector<uint8_t>& sync_word,
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bool append_crc, bool whitening,
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bool manchester)
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{
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return gnuradio::get_initial_sptr (
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new upsat_fsk_frame_encoder_impl (preamble, sync_word, append_crc,
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whitening, manchester));
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}
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/*
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* The private constructor
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*/
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upsat_fsk_frame_encoder_impl::upsat_fsk_frame_encoder_impl (
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const std::vector<uint8_t>& preamble,
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const std::vector<uint8_t>& sync_word, bool append_crc, bool whitening,
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bool manchester) :
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gr::sync_block ("upsat_fsk_frame_encoder",
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gr::io_signature::make (0, 0, 0),
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gr::io_signature::make (1, 1, sizeof(float))),
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d_preamble (preamble),
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d_preamble_len (preamble.size ()),
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d_sync_word (sync_word),
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d_sync_word_len (sync_word.size ()),
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d_append_crc(append_crc),
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d_whitening(whitening),
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d_manchester(manchester),
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d_encoded(0),
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d_pdu_len(0)
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{
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message_port_register_in (pmt::mp ("pdu"));
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/*
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* Allocate memory for the maximum possible frame WITH all headers and
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* tail fields
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* +-------------+----------+--------+--------------------------+------+
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* | Preamble | SFD | LENGTH | PDU | CRC |
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* +-------------+----------+--------+--------------------------+------+
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* User def. User def. 1B 1-255 B 2 B
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*/
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d_pdu = new uint8_t[d_preamble_len + d_sync_word_len + sizeof(uint8_t)
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+ UPSAT_MAX_FRAME_LEN + sizeof(uint16_t)];
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/* Copy the preamble at the start of the pdu */
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memcpy(d_pdu, d_preamble.data(), d_preamble_len);
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memcpy(d_pdu + d_preamble_len, d_sync_word.data(), d_sync_word_len);
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}
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/*
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* Our virtual destructor.
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*/
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upsat_fsk_frame_encoder_impl::~upsat_fsk_frame_encoder_impl ()
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{
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delete [] d_pdu;
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}
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int
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upsat_fsk_frame_encoder_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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pmt::pmt_t pdu;
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float *out = (float *) output_items[0];
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/*
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* If the whole previous frame has been successfully sent, block waiting
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* for a new one
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*/
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if(d_encoded == 0){
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pdu = delete_head_blocking(pmt::mp("pdu"));
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d_pdu_len = pmt::blob_length (pdu);
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if(d_pdu_len > UPSAT_MAX_FRAME_LEN){
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LOG_ERROR("PDU is greater than the supported. Dropping the PDU");
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return 0;
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}
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/* Set the frame length at the corresponding field */
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d_pdu[d_preamble_len + d_sync_word_len] = (uint8_t) d_pdu_len;
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/* Append the variable length PDU */
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memcpy (d_pdu + d_preamble_len + d_sync_word_len + sizeof(uint8_t),
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pmt::blob_data (pdu),
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d_pdu_len * sizeof(uint8_t));
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d_pdu_len += d_preamble_len + d_sync_word_len + sizeof(uint8_t);
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/* If it is necessary calculate and append the CRC */
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if(d_append_crc) {
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/* TODO: Calc CRC */
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d_pdu_len += sizeof(uint16_t);
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}
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}
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return noutput_items;
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}
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} /* namespace satnogs */
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} /* namespace gr */
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