nec_codec.hpp

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/*
 * SPDX-FileCopyrightText: 2026 M5Stack Technology CO LTD
 *
 * SPDX-License-Identifier: MIT
 */
#ifndef M5_UNIT_INFRARED_IR_NEC_CODEC_HPP
#define M5_UNIT_INFRARED_IR_NEC_CODEC_HPP
 
#include "ir_codec.hpp"
 
namespace m5 {
namespace unit {
namespace ir {
 
class NecCodec : public IRCodec {
public:
    NecCodec() : IRCodec(CodecType::NEC)
    {
    }
 
    item_container_type encode(uint16_t address, uint16_t command, bool repeat) override;
    bool decode(const gpio::m5_rmt_item_t* items, uint32_t num, DecodeResult& result) override;
 
    uint32_t carrierFrequencyHz() const override
    {
        return 38000;
    }
 
    item_container_type encodeRaw(uint32_t data);
 
    item_container_type encodeRepeat();
 
private:
    // Timing constants in microseconds (RMT tick = 1 us)
    static constexpr uint16_t LEADER_MARK{9000};
    static constexpr uint16_t LEADER_SPACE{4500};
    static constexpr uint16_t BIT_MARK{560};
    static constexpr uint16_t ONE_SPACE{1690};
    static constexpr uint16_t ZERO_SPACE{560};
    static constexpr uint16_t REPEAT_SPACE{2250};
    static constexpr uint16_t TOLERANCE{200};
};
 
}  // namespace ir
}  // namespace unit
}  // namespace m5
#endif