adapter_gpio.hpp

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/*
 * SPDX-FileCopyrightText: 2025 M5Stack Technology CO LTD
 *
 * SPDX-License-Identifier: MIT
 */
#ifndef M5_UNIT_COMPONENT_ADAPTER_GPIO_HPP
#define M5_UNIT_COMPONENT_ADAPTER_GPIO_HPP
 
#include "identify_functions.hpp"
#include "types.hpp"
#include "adapter_base.hpp"
 
// GPIO / RMT are ESP platform features
#if defined(ESP_PLATFORM)
namespace m5 {
namespace unit {
namespace gpio {
 
uint8_t calculate_rmt_clk_div(const uint32_t apb_freq_hz, const uint32_t tick_ns);
 
uint32_t calculate_rmt_resolution_hz(const uint32_t apb_freq_hz, const uint32_t tick_ns);
 
int8_t gpio_to_adc_channel(const int8_t pin);
 
bool apply_rx_pull(const gpio_num_t pin, const RxPull pull);
 
}  // namespace gpio
 
// Base class for AdapterGPIO
class AdapterGPIOBase : public Adapter {
public:
    class GPIOImpl : public Adapter::Impl {
    public:
        GPIOImpl() = default;
        GPIOImpl(const int8_t rx_pin, const int8_t tx_pin) : _rx_pin{(gpio_num_t)rx_pin}, _tx_pin{(gpio_num_t)tx_pin}
        {
        }
        virtual ~GPIOImpl() override;
 
        inline gpio_num_t rx_pin() const
        {
            return _rx_pin;
        }
        inline gpio_num_t tx_pin() const
        {
            return _tx_pin;
        }
        inline gpio::adapter_config_t adapter_config() const
        {
            return _adapter_cfg;
        }
 
        inline virtual bool begin(const gpio::adapter_config_t& cfg)
        {
            return false;
        }
 
        virtual int rmtTxChannel() const
        {
            return -1;
        }
        virtual int rmtRxChannel() const
        {
            return -1;
        }
        virtual void* rmtTxHandle() const
        {
            return nullptr;
        }
        virtual void* rmtRxHandle() const
        {
            return nullptr;
        }
 
        //
        inline virtual m5::hal::error::error_t pinModeRX(const gpio::Mode m) override
        {
            return pin_mode(rx_pin(), m);
        }
        inline virtual m5::hal::error::error_t writeDigitalRX(const bool high) override
        {
            return write_digital(rx_pin(), high);
        }
        inline virtual m5::hal::error::error_t readDigitalRX(bool& high) override
        {
            return read_digital(rx_pin(), high);
        }
        inline virtual m5::hal::error::error_t writeAnalogRX(const uint16_t v) override
        {
            return write_analog(rx_pin(), v);
        }
        inline virtual m5::hal::error::error_t readAnalogRX(uint16_t& v) override
        {
            return read_analog(v, rx_pin());
        }
        inline virtual m5::hal::error::error_t readAnalogMilliVoltsRX(uint32_t& mv) override
        {
            return read_analog_millivolts(mv, rx_pin());
        }
 
        inline virtual m5::hal::error::error_t pulseInRX(uint32_t& duration, const int state,
                                                         const uint32_t timeout_us = 30000) override
        {
            return pulse_in(duration, rx_pin(), state, timeout_us);
        }
 
        //
        inline virtual m5::hal::error::error_t pinModeTX(const gpio::Mode m) override
        {
            return pin_mode(tx_pin(), m);
        }
        inline virtual m5::hal::error::error_t writeDigitalTX(const bool high) override
        {
            return write_digital(tx_pin(), high);
        }
        inline virtual m5::hal::error::error_t readDigitalTX(bool& high) override
        {
            return read_digital(tx_pin(), high);
        }
        inline virtual m5::hal::error::error_t writeAnalogTX(const uint16_t v) override
        {
            return write_analog(tx_pin(), v);
        }
        inline virtual m5::hal::error::error_t readAnalogTX(uint16_t& v) override
        {
            return read_analog(v, tx_pin());
        }
        inline virtual m5::hal::error::error_t readAnalogMilliVoltsTX(uint32_t& mv) override
        {
            return read_analog_millivolts(mv, tx_pin());
        }
        inline virtual m5::hal::error::error_t pulseInTX(uint32_t& duration, const int state,
                                                         const uint32_t timeout_us = 30000) override
        {
            return pulse_in(duration, tx_pin(), state, timeout_us);
        }
 
    protected:
        m5::hal::error::error_t pin_mode(const gpio_num_t pin, const gpio::Mode m);
        m5::hal::error::error_t write_digital(const gpio_num_t pin, const bool high);
        m5::hal::error::error_t read_digital(const gpio_num_t pin, bool& high);
        m5::hal::error::error_t write_analog(const gpio_num_t pin, const uint16_t value);
        m5::hal::error::error_t read_analog(uint16_t& value, const gpio_num_t pin);
        m5::hal::error::error_t read_analog_millivolts(uint32_t& millivolts, const gpio_num_t pin);
        m5::hal::error::error_t pulse_in(uint32_t& duration, const gpio_num_t pin, const int state,
                                         const uint32_t timeout_us);
 
    protected:
        m5::hal::error::error_t ensure_adc_handle(const gpio_num_t pin);
        void release_adc_resources();
 
        gpio_num_t _rx_pin{(gpio_num_t)-1}, _tx_pin{(gpio_num_t)-1};
        gpio::adapter_config_t _adapter_cfg{};
 
#if defined(M5_UNIT_UNIFIED_USING_ADC_ONESHOT)
        void* _adc_handle{};              // adc_oneshot_unit_handle_t
        void* _cali_handle{};             // adc_cali_handle_t
        int8_t _cached_adc_unit{-1};      // 0=ADC1, 1=ADC2, -1=uninitialized
        int8_t _cached_cali_channel{-1};  // cached calibration channel, -1=uninitialized
#endif
    };
    //
    explicit AdapterGPIOBase(GPIOImpl* impl);
 
    inline GPIOImpl* impl()
    {
        return static_cast<GPIOImpl*>(_impl.get());
    }
    inline const GPIOImpl* impl() const
    {
        return static_cast<GPIOImpl*>(_impl.get());
    }
    inline gpio_num_t rx_pin() const
    {
        return impl()->rx_pin();
    }
    inline gpio_num_t tx_pin() const
    {
        return impl()->tx_pin();
    }
    inline bool begin(const gpio::adapter_config_t& cfg)
    {
        return impl()->begin(cfg);
    }
};
 
}  // namespace unit
}  // namespace m5
#endif  // ESP_PLATFORM
 
#endif