78 lines
2.3 KiB
C++
78 lines
2.3 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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namespace esphome {
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namespace pca9554 {
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class PCA9554Component : public Component, public i2c::I2CDevice {
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public:
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PCA9554Component() = default;
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/// Check i2c availability and setup masks
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void setup() override;
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/// Poll for input changes periodically
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void loop() override;
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/// Helper function to read the value of a pin.
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bool digital_read(uint8_t pin);
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/// Helper function to write the value of a pin.
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void digital_write(uint8_t pin, bool value);
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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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float get_loop_priority() const override;
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void dump_config() override;
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void set_pin_count(size_t pin_count) { this->pin_count_ = pin_count; }
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protected:
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bool read_inputs_();
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bool write_register_(uint8_t reg, uint16_t value);
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/// number of bits the expander has
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size_t pin_count_{8};
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/// width of registers
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size_t reg_width_{1};
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/// Mask for the pin config - 1 means OUTPUT, 0 means INPUT
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uint16_t config_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 of the actual input pin states - 1 means HIGH, 0 means LOW
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uint16_t input_mask_{0x00};
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/// Flags to check if read previously during this loop
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uint16_t was_previously_read_ = {0x00};
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/// Storage for last I2C error seen
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esphome::i2c::ErrorCode last_error_;
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};
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/// Helper class to expose a PCA9554 pin as an internal input GPIO pin.
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class PCA9554GPIOPin : 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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std::string dump_summary() const override;
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void set_parent(PCA9554Component *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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PCA9554Component *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 pca9554
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} // namespace esphome
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