crc_check.h
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/* -*- c++ -*- */
/*
* Copyright 2022 Daniel Estevez <daniel@destevez.net>
*
* This file is part of gr-satellites
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_SATELLITES_CRC_CHECK_H
#define INCLUDED_SATELLITES_CRC_CHECK_H
#include <gnuradio/block.h>
#include <satellites/api.h>
#include <stdint.h>
namespace gr {
namespace satellites {
/*!
* \brief Check the CRC at the end of a PDU
* \ingroup satellites
*
* \details
* The CRC append block receives a PDU containing a CRC at its end,
* and checks whether the CRC is correct. The PDU is sent over the ok
* or fail output ports according to the result of this check.
* It can support any CRC whose size is a multiple of 8 bits between
* 8 and 64 bits.
*/
class SATELLITES_API crc_check : virtual public gr::block
{
public:
typedef boost::shared_ptr<crc_check> sptr;
/*!
* \brief Build the CRC append block.
*
* \param num_bits CRC size in bits (must be a multiple of 8)
* \param poly CRC polynomial, in MSB-first notation
* \param initial_value Initial register value
* \param final_xor Final XOR value
* \param input_reflected true if the input is LSB-first, false if not
* \param result_reflected true if the output is LSB-first, false if not
* \param swap_endianness true if the CRC is stored as little-endian in the PDU,
false if not
* \param discard_crc If true, the CRC is removed from the PDU before sending
it to the output port. If false, the CRC is preserved in the outupt PDU.
* \param skip_header_bytes gives the number of header byte to skip in the CRC
calculation
*/
static sptr make(unsigned num_bits,
uint64_t poly,
uint64_t initial_value,
uint64_t final_xor,
bool input_reflected,
bool result_reflected,
bool swap_endianness,
bool discard_crc = false,
unsigned skip_header_bytes = 0);
};
} // namespace satellites
} // namespace gr
#endif /* INCLUDED_SATELLITES_CRC_CHECK_H */
api.h
SATELLITES_API
#define SATELLITES_API
Definition: api.h:31
gr::satellites::crc_check
Check the CRC at the end of a PDU.
Definition: crc_check.h:34
gr::satellites::crc_check::make
static sptr make(unsigned num_bits, uint64_t poly, uint64_t initial_value, uint64_t final_xor, bool input_reflected, bool result_reflected, bool swap_endianness, bool discard_crc=false, unsigned skip_header_bytes=0)
Build the CRC append block.
gr::satellites::crc_check::sptr
boost::shared_ptr< crc_check > sptr
Definition: crc_check.h:36
gr
Definition: ax100_decode.h:17