mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 03:34:35 +00:00
140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __PACKET_BUILDER_H__
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#define __PACKET_BUILDER_H__
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#include <cstdint>
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#include <cstddef>
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#include <bitset>
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#include <functional>
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#include "bit_pattern.hpp"
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#include "baseband_packet.hpp"
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struct NeverMatch {
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bool operator()(const BitHistory&, const size_t) const {
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return false;
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}
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};
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struct FixedLength {
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bool operator()(const BitHistory&, const size_t symbols_received) const {
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return symbols_received >= length;
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}
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const size_t length;
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};
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template<typename PreambleMatcher, typename UnstuffMatcher, typename EndMatcher>
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class PacketBuilder {
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public:
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using PayloadHandlerFunc = std::function<void(const baseband::Packet& packet)>;
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PacketBuilder(
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const PreambleMatcher preamble_matcher,
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const UnstuffMatcher unstuff_matcher,
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const EndMatcher end_matcher,
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PayloadHandlerFunc payload_handler
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) : payload_handler { std::move(payload_handler) },
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preamble(preamble_matcher),
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unstuff(unstuff_matcher),
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end(end_matcher)
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{
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}
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void configure(
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const PreambleMatcher preamble_matcher,
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const UnstuffMatcher unstuff_matcher
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) {
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preamble = preamble_matcher;
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unstuff = unstuff_matcher;
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reset_state();
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}
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void execute(
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const uint_fast8_t symbol
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) {
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bit_history.add(symbol);
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switch(state) {
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case State::Preamble:
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if( preamble(bit_history, packet.size()) ) {
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state = State::Payload;
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}
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break;
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case State::Payload:
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if( !unstuff(bit_history, packet.size()) ) {
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packet.add(symbol);
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}
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if( end(bit_history, packet.size()) ) {
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// NOTE: This check is to avoid std::function nullptr check, which
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// brings in "_ZSt25__throw_bad_function_callv" and a lot of extra code.
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// TODO: Make payload_handler known at compile time.
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if( payload_handler ) {
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packet.set_timestamp(Timestamp::now());
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payload_handler(packet);
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}
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reset_state();
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} else {
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if( packet_truncated() ) {
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reset_state();
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}
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}
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break;
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default:
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reset_state();
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break;
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}
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}
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private:
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enum State {
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Preamble,
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Payload,
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};
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bool packet_truncated() const {
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return packet.size() >= packet.capacity();
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}
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const PayloadHandlerFunc payload_handler;
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BitHistory bit_history { };
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PreambleMatcher preamble { };
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UnstuffMatcher unstuff { };
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EndMatcher end { };
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State state { State::Preamble };
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baseband::Packet packet { };
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void reset_state() {
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packet.clear();
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state = State::Preamble;
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}
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};
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#endif/*__PACKET_BUILDER_H__*/
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