Dave Williams | DitroniX | G8PUO
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
#pragma once
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#include "esphome/components/gpio_expander/cached_gpio.h"
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#include "esphome/components/i2c/i2c.h"
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#include "esphome/core/component.h"
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#include "esphome/core/hal.h"
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namespace esphome {
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namespace tca6408 {
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/**
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* TCA6408 8-bit I²C I/O Expander Component
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*
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* Features:
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* - 8 bidirectional GPIO pins (0-7)
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* - Hardware polarity inversion (for inputs)
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* - Interrupt support (active-low open-drain INT pin)
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* - Cached GPIO access for efficiency
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* - Works with ESP32 (including C5), ESP8266, etc.
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*/
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class TCA6408Component : public Component,
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public i2c::I2CDevice,
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public gpio_expander::CachedGpioExpander<uint8_t, 8> {
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public:
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void setup() override;
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void loop() override;
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void dump_config() override;
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float get_setup_priority() const override { return setup_priority::IO; }
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/** Set I²C address (default 0x20) */
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void set_address(uint8_t address) { this->address_ = address; }
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/** Set ESP GPIO connected to TCA6408 INT pin (recommended) */
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void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
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/** Set hardware polarity inversion for a specific pin (used internally) */
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void set_polarity_inversion(uint8_t pin, bool inverted);
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protected:
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/** Interrupt Service Routine - lightweight, runs in ISR context */
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static void IRAM_ATTR gpio_intr(TCA6408Component *arg);
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// GPIO Expander overrides
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bool digital_read_hw(uint8_t pin) override;
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bool digital_read_cache(uint8_t pin) override;
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void digital_write_hw(uint8_t pin, bool value) override;
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void pin_mode(uint8_t pin, gpio::Flags flags) override;
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uint8_t mode_mask_{0xFF}; // 1 = input, 0 = output (Config Register 0x03)
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uint8_t output_mask_{0x00}; // Output Port Register 0x01
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uint8_t input_mask_{0x00}; // Input Port Register 0x00
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uint8_t polarity_mask_{0x00}; // Polarity Inversion Register 0x02 (1 = inverted)
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InternalGPIOPin *interrupt_pin_{nullptr}; // ESP pin connected to TCA6408 INT
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bool interrupt_triggered_{false}; // Flag set by ISR
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private:
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bool read_gpio_outputs_();
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};
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class TCA6408GPIOPin : public gpio::GPIOPin, public Parented<TCA6408Component> {
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public:
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void setup() override;
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void pin_mode(gpio::Flags flags) override;
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bool digital_read() override;
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void digital_write(bool value) override;
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size_t dump_summary(char *buffer, size_t len) const override;
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void set_pin(uint8_t pin) { pin_ = pin; }
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void set_inverted(bool inverted);
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void set_flags(gpio::Flags flags) { flags_ = flags; }
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gpio::Flags get_flags() const override { return flags_; }
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protected:
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uint8_t pin_{0};
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bool inverted_{false};
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gpio::Flags flags_{0};
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};
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} // namespace tca6408
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} // namespace esphome
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