77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
#pragma once
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#include "esphome/core/component.h"
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#include "esphome/core/hal.h"
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#include "esphome/components/i2c/i2c.h"
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#include "esphome/components/gpio_expander/cached_gpio.h"
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namespace esphome {
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namespace pcf8574 {
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// PCF8574(8 pins)/PCF8575(16 pins) always read/write all pins in a single I2C transaction
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// so we use uint16_t as bank type to ensure all pins are in one bank and cached together
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class PCF8574Component : public Component,
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public i2c::I2CDevice,
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public gpio_expander::CachedGpioExpander<uint16_t, 16> {
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public:
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PCF8574Component() = default;
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void set_pcf8575(bool pcf8575) { pcf8575_ = pcf8575; }
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void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
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/// Check i2c availability and setup masks
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void setup() override;
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void loop() override;
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/// Helper function to set the pin mode of a pin.
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void pin_mode(uint8_t pin, gpio::Flags flags);
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float get_setup_priority() const override;
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void dump_config() override;
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protected:
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static void IRAM_ATTR gpio_intr(PCF8574Component *arg);
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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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bool read_gpio_();
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bool write_gpio_();
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/// Mask for the pin mode - 1 means output, 0 means input
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uint16_t mode_mask_{0x00};
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/// The mask to write as output state - 1 means HIGH, 0 means LOW
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uint16_t output_mask_{0x00};
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/// The state read in read_gpio_ - 1 means HIGH, 0 means LOW
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uint16_t input_mask_{0x00};
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bool pcf8575_; ///< TRUE->16-channel PCF8575, FALSE->8-channel PCF8574
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InternalGPIOPin *interrupt_pin_{nullptr};
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};
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/// Helper class to expose a PCF8574 pin as an internal input GPIO pin.
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class PCF8574GPIOPin : public GPIOPin {
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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_parent(PCF8574Component *parent) { parent_ = parent; }
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void set_pin(uint8_t pin) { pin_ = pin; }
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void set_inverted(bool inverted) { inverted_ = inverted; }
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void set_flags(gpio::Flags flags) { flags_ = flags; }
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gpio::Flags get_flags() const override { return this->flags_; }
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protected:
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PCF8574Component *parent_;
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uint8_t pin_;
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bool inverted_;
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gpio::Flags flags_;
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};
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} // namespace pcf8574
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} // namespace esphome
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