pcf8574.h

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#pragma once
 
#include "esphome/core/component.h"
#include "esphome/core/hal.h"
#include "esphome/components/i2c/i2c.h"
#include "esphome/components/gpio_expander/cached_gpio.h"
 
namespace esphome {
namespace pcf8574 {
 
// PCF8574(8 pins)/PCF8575(16 pins) always read/write all pins in a single I2C transaction
// so we use uint16_t as bank type to ensure all pins are in one bank and cached together
class PCF8574Component : public Component,
                         public i2c::I2CDevice,
                         public gpio_expander::CachedGpioExpander<uint16_t, 16> {
 public:
  PCF8574Component() = default;
 
  void set_pcf8575(bool pcf8575) { pcf8575_ = pcf8575; }
  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
 
  void setup() override;
  void loop() override;
  void pin_mode(uint8_t pin, gpio::Flags flags);
 
  float get_setup_priority() const override;
 
  void dump_config() override;
 
 protected:
  static void IRAM_ATTR gpio_intr(PCF8574Component *arg);
 
  bool digital_read_hw(uint8_t pin) override;
  bool digital_read_cache(uint8_t pin) override;
  void digital_write_hw(uint8_t pin, bool value) override;
 
  bool read_gpio_();
  bool write_gpio_();
 
  uint16_t mode_mask_{0x00};
  uint16_t output_mask_{0x00};
  uint16_t input_mask_{0x00};
  bool pcf8575_;  
  InternalGPIOPin *interrupt_pin_{nullptr};
};
 
class PCF8574GPIOPin : public GPIOPin {
 public:
  void setup() override;
  void pin_mode(gpio::Flags flags) override;
  bool digital_read() override;
  void digital_write(bool value) override;
  size_t dump_summary(char *buffer, size_t len) const override;
 
  void set_parent(PCF8574Component *parent) { parent_ = parent; }
  void set_pin(uint8_t pin) { pin_ = pin; }
  void set_inverted(bool inverted) { inverted_ = inverted; }
  void set_flags(gpio::Flags flags) { flags_ = flags; }
 
  gpio::Flags get_flags() const override { return this->flags_; }
 
 protected:
  PCF8574Component *parent_;
  uint8_t pin_;
  bool inverted_;
  gpio::Flags flags_;
};
 
}  // namespace pcf8574
}  // namespace esphome