portapack-mayhem/firmware/baseband/symbol_coding.hpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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 2, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __SYMBOL_CODING_H__
#define __SYMBOL_CODING_H__
#include <cstdint>
#include <cstddef>
namespace symbol_coding {
class NRZIDecoder {
public:
uint_fast8_t operator()(const uint_fast8_t symbol) {
const auto out = (~(symbol ^ last)) & 1;
last = symbol;
return out;
}
private:
uint_fast8_t last{0};
};
class ACARSDecoder {
public:
uint_fast8_t operator()(const uint_fast8_t symbol) {
last ^= (~symbol & 1);
return last;
}
private:
uint_fast8_t last{0};
};
} /* namespace symbol_coding */
#endif /*__SYMBOL_CODING_H__*/