kopia lustrzana https://github.com/mobilinkd/tnc3-firmware
79 wiersze
1.8 KiB
C++
79 wiersze
1.8 KiB
C++
// Copyright 2015-2020 Mobilinkd LLC <rob@mobilinkd.com>
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// All rights reserved.
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#pragma once
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#include "HdlcFrame.hpp"
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#include <cstdint>
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namespace mobilinkd { namespace tnc { namespace hdlc {
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struct NewDecoder
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{
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enum class State {IDLE, SYNC, RECEIVE};
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using frame_type = IoFrame;
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using result_type = std::tuple<frame_type*, uint8_t>;
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using optional_result_type = frame_type*;
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static constexpr uint8_t STATUS_OK{0x01};
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static constexpr uint8_t STATUS_USER_CANCEL{0x02};
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static constexpr uint8_t STATUS_FRAME_ABORT{0x04};
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static constexpr uint8_t STATUS_FRAME_ERROR{0x08};
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static constexpr uint8_t STATUS_NO_CARRIER{0x10};
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static constexpr uint8_t STATUS_CRC_ERROR{0x20};
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static constexpr uint16_t VALID_CRC = 0xf0b8;
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State state{State::IDLE};
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uint8_t buffer{0};
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uint8_t bits{0};
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uint8_t report_bits{0};
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uint8_t ones{0};
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bool flag{0};
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bool had_dcd{false};
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/**
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* Tell the demodulator to return all "passable" HDLC frames. These
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* are frames which consist of an even multiple of eight bits and are
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* up to 330 bytes, but which do not have a valid checksum.
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*/
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bool passall{false};
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enum class DCD { ON, PARTIAL, OFF };
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DCD dcd{DCD::PARTIAL};
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frame_type* packet{nullptr};
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NewDecoder(bool pass_all=false)
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: passall(pass_all)
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{}
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bool can_pass(uint8_t status) const
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{
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return status == STATUS_OK or (passall and status == STATUS_CRC_ERROR);
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}
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optional_result_type operator()(bool input, bool pll_lock);
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uint8_t process(bool input, bool pll_lock);
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void setPassall(bool enabled)
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{
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passall = enabled;
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}
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void setDCD(DCD config)
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{
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dcd = config;
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}
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bool active() const
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{
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return state != State::IDLE;
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}
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};
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}}} // mobilinkd::tnc::hdlc
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