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56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
#pragma once
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#include "esphome/core/component.h"
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#include "esphome/components/sensor/sensor.h"
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#include "esphome/components/i2c/i2c.h"
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namespace esphome::bh1750 {
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enum BH1750Mode : uint8_t {
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BH1750_MODE_L,
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BH1750_MODE_H,
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BH1750_MODE_H2,
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};
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/// This class implements support for the i2c-based BH1750 ambient light sensor.
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class BH1750Sensor : public sensor::Sensor, public PollingComponent, public i2c::I2CDevice {
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public:
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// ========== INTERNAL METHODS ==========
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// (In most use cases you won't need these)
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void setup() override;
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void dump_config() override;
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void update() override;
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void loop() override;
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float get_setup_priority() const override;
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protected:
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// State machine states
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enum State : uint8_t {
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IDLE,
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WAITING_COARSE_MEASUREMENT,
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READING_COARSE_RESULT,
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WAITING_FINE_MEASUREMENT,
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READING_FINE_RESULT,
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};
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// 4-byte aligned members
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uint32_t measurement_start_time_{0};
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uint32_t measurement_duration_{0};
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// 1-byte members grouped together to minimize padding
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State state_{IDLE};
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BH1750Mode current_mode_{BH1750_MODE_L};
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uint8_t current_mtreg_{31};
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BH1750Mode fine_mode_{BH1750_MODE_H2};
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uint8_t fine_mtreg_{254};
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uint8_t active_mtreg_{0};
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// Helper methods
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bool start_measurement_(BH1750Mode mode, uint8_t mtreg, uint32_t now);
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bool read_measurement_(float &lx_out);
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void process_coarse_result_(float lx);
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void fail_and_reset_();
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};
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} // namespace esphome::bh1750
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