unit_SIT3088.hpp

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/*
 * SPDX-FileCopyrightText: 2026 M5Stack Technology CO LTD
 *
 * SPDX-License-Identifier: MIT
 */
#ifndef M5_UNIT_RS485_UNIT_SIT3088_HPP
#define M5_UNIT_RS485_UNIT_SIT3088_HPP
 
#include "rs485_component.hpp"
 
namespace m5 {
namespace unit {
 
class UnitSIT3088 : public RS485Component {
    M5_UNIT_COMPONENT_HPP_BUILDER(UnitSIT3088, 0x00 /*UART*/);
 
public:
    struct config_t : public RS485Component::config_t {
        int8_t dir_pin{-1};  
    };
 
    UnitSIT3088();
    virtual ~UnitSIT3088() = default;
 
    virtual bool begin() override;
 
 
    inline config_t config()
    {
        return _sit_cfg;
    }
    inline void config(const config_t &cfg)
    {
        _sit_cfg = cfg;
        // Sync inherited fields (flushRX) to the parent's storage so RS485Component::begin() sees them.
        RS485Component::config(cfg);
    }
 
protected:
    virtual void configure_dir_pin(const int8_t pin);
    virtual void set_transmit(const bool tx_enable);
    // Install a direction-pin-controlled ISerial decorator around the raw HardwareSerial.
    virtual std::unique_ptr<ISerial> make_serial(AdapterUART *ad) override;
 
    inline int8_t configured_dir_pin() const
    {
        return _configured_dir_pin;
    }
 
private:
    config_t _sit_cfg{};
    int8_t _configured_dir_pin{-1};  // captured during begin(); immune to post-begin config changes
 
#if defined(ARDUINO)
    friend struct DirControlledSerial;  // internal decorator needs set_transmit() access
#endif
};
 
}  // namespace unit
}  // namespace m5
#endif