rotary_encoder.h

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#pragma once
 
#include <array>
 
#include "esphome/core/component.h"
#include "esphome/core/hal.h"
#include "esphome/components/sensor/sensor.h"
 
namespace esphome::rotary_encoder {
 
enum RotaryEncoderRestoreMode {
  ROTARY_ENCODER_RESTORE_DEFAULT_ZERO,  
  ROTARY_ENCODER_ALWAYS_ZERO,           
};
 
enum RotaryEncoderResolution {
  ROTARY_ENCODER_1_PULSE_PER_CYCLE =
      0x4400,  
  ROTARY_ENCODER_2_PULSES_PER_CYCLE = 0x2200,  
  ROTARY_ENCODER_4_PULSES_PER_CYCLE = 0x1100,  
};
 
struct RotaryEncoderSensorStore {
  ISRInternalGPIOPin pin_a;
  ISRInternalGPIOPin pin_b;
 
  volatile int32_t counter{0};
  RotaryEncoderResolution resolution{ROTARY_ENCODER_1_PULSE_PER_CYCLE};
  int32_t min_value{INT32_MIN};
  int32_t max_value{INT32_MAX};
  int32_t last_read{0};
  uint8_t state{0};
  bool first_read{true};
 
  std::array<int8_t, 8> rotation_events{};
  bool rotation_events_overflow{false};
 
  static void gpio_intr(RotaryEncoderSensorStore *arg);
};
 
class RotaryEncoderSensor final : public sensor::Sensor, public Component {
 public:
  void set_pin_a(InternalGPIOPin *pin_a) { pin_a_ = pin_a; }
  void set_pin_b(InternalGPIOPin *pin_b) { pin_b_ = pin_b; }
 
  void set_restore_mode(RotaryEncoderRestoreMode restore_mode);
 
  void set_resolution(RotaryEncoderResolution mode);
 
  void set_value(int value) {
    this->store_.counter = value;
    this->loop();
  }
 
  void set_reset_pin(GPIOPin *pin_i) { this->pin_i_ = pin_i; }
  void set_min_value(int32_t min_value);
  void set_max_value(int32_t max_value);
  void set_publish_initial_value(bool publish_initial_value) { publish_initial_value_ = publish_initial_value; }
 
  // ========== INTERNAL METHODS ==========
  // (In most use cases you won't need these)
  void setup() override;
  void dump_config() override;
  void loop() override;
 
  template<typename F> void add_on_clockwise_callback(F &&callback) {
    this->on_clockwise_callback_.add(std::forward<F>(callback));
  }
 
  template<typename F> void add_on_anticlockwise_callback(F &&callback) {
    this->on_anticlockwise_callback_.add(std::forward<F>(callback));
  }
 
  template<typename F> void register_listener(F &&listener) { this->listeners_.add(std::forward<F>(listener)); }
 
 protected:
  InternalGPIOPin *pin_a_;
  InternalGPIOPin *pin_b_;
  GPIOPin *pin_i_{nullptr};  
  bool publish_initial_value_;
  ESPPreferenceObject rtc_;
  RotaryEncoderRestoreMode restore_mode_{ROTARY_ENCODER_RESTORE_DEFAULT_ZERO};
 
  RotaryEncoderSensorStore store_{};
 
  CallbackManager<void()> on_clockwise_callback_{};
  CallbackManager<void()> on_anticlockwise_callback_{};
  CallbackManager<void(int32_t)> listeners_{};
};
 
}  // namespace esphome::rotary_encoder