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/* -*- c++ -*- */
/*
* Copyright 2021 Cesar Martinez.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "crc16_async_bb_impl.h"
#include <gnuradio/io_signature.h>
#include <volk/volk.h>
namespace gr {
namespace digital {
crc16_async_bb::sptr crc16_async_bb::make(bool check)
{
return gnuradio::make_block_sptr<crc16_async_bb_impl>(check);
}
crc16_async_bb_impl::crc16_async_bb_impl(bool check)
: block("crc16_async_bb", io_signature::make(0, 0, 0), io_signature::make(0, 0, 0)),
d_npass(0),
d_nfail(0)
{
d_in_port = pmt::mp("in");
d_out_port = pmt::mp("out");
message_port_register_in(d_in_port);
message_port_register_out(d_out_port);
if (check)
set_msg_handler(d_in_port, [this](pmt::pmt_t msg) { this->check(msg); });
else
set_msg_handler(d_in_port, [this](pmt::pmt_t msg) { this->calc(msg); });
}
crc16_async_bb_impl::~crc16_async_bb_impl() {}
void crc16_async_bb_impl::calc(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
unsigned int crc;
size_t pkt_len(0);
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, pkt_len);
std::vector<uint8_t> bytes_out(2 + pkt_len);
crc = process_crc(bytes_in, pkt_len);
memcpy((void*)bytes_out.data(), (const void*)bytes_in, pkt_len);
memcpy((void*)(bytes_out.data() + pkt_len), &crc, 2);
pmt::pmt_t output = pmt::init_u8vector(
pkt_len + 2,
bytes_out.data()); // this copies the values from bytes_out into the u8vector
pmt::pmt_t msg_pair = pmt::cons(meta, output);
message_port_pub(d_out_port, msg_pair);
}
unsigned int crc16_async_bb_impl::process_crc(const uint8_t* bytes_in,
size_t n_bytes_prcss)
{
unsigned int result;
d_crc_ccitt_impl.reset();
d_crc_ccitt_impl.process_bytes(bytes_in, n_bytes_prcss);
result = d_crc_ccitt_impl();
return result;
}
void crc16_async_bb_impl::check(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
unsigned int crc;
size_t pkt_len(0);
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, pkt_len);
crc = process_crc(bytes_in, pkt_len - 2);
if (crc != *(unsigned int*)(bytes_in + pkt_len - 2)) { // Drop package
d_nfail++;
return;
}
d_npass++;
pmt::pmt_t output = pmt::init_u8vector(pkt_len - 2, bytes_in);
pmt::pmt_t msg_pair = pmt::cons(meta, output);
message_port_pub(d_out_port, msg_pair);
}
int crc16_async_bb_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
return noutput_items;
}
} /* namespace digital */
} /* namespace gr */
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