kopia lustrzana https://github.com/pimoroni/pimoroni-pico
114 wiersze
3.9 KiB
C++
114 wiersze
3.9 KiB
C++
#pragma once
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#include "hardware/i2c.h"
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#include "hardware/gpio.h"
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#include "common/pimoroni_common.hpp"
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#include "common/pimoroni_i2c.hpp"
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// commands and constants
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#define SGP30_REQ_FEATURES 0x0020 // The required feature set
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#define SGP30_CRC_SEED 0x31 // CRC Seed
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#define SGP30_CRC_BASE 0xFF // Base value for calculating CRC
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namespace pimoroni {
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class SGP30 {
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//--------------------------------------------------
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// Constants
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//--------------------------------------------------
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public:
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static const uint8_t DEFAULT_I2C_ADDRESS = 0x58;
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private:
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/***** Private constants here *****/
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const uint16_t SOFT_RESET = 0x0006;
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const uint16_t INIT_AIR_QUALITY = 0x2003;
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const uint16_t MEASURE_AIR_QUALITY = 0x2008;
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const uint16_t GET_BASELINE = 0x2015;
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const uint16_t SET_BASELINE = 0x201e;
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const uint16_t SET_HUMIDITY = 0x2061;
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const uint16_t MEASURE_TEST = 0x2032;
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const uint16_t GET_FEATURE_SET_VERSION = 0x202f;
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const uint16_t MEASURE_RAW_SIGNALS = 0x2050;
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const uint16_t GET_SERIAL_ID = 0x3682;
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//--------------------------------------------------
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// Variables
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//--------------------------------------------------
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private:
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I2C *i2c;
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const int8_t address = DEFAULT_I2C_ADDRESS;
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//--------------------------------------------------
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// Constructors/Destructor
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//--------------------------------------------------
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public:
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SGP30() : SGP30(new I2C()) {};
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SGP30(I2C *i2c) : i2c(i2c) {}
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// TODO remove MicroPython-binding compatibility constructors
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SGP30(i2c_inst_t *i2c_inst, uint sda, uint scl) : i2c(new I2C(sda, scl)) { }
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//--------------------------------------------------
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// Methods
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//--------------------------------------------------
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public:
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bool init();
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// For print access in micropython
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i2c_inst_t* get_i2c() const;
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int get_sda() const;
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int get_scl() const;
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// uint8_t command(uint8_t command_name, uint8_t parameters/*=None*/);
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// Get the unique ID from the chip and store locally
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bool retrieve_unique_id();
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// Return the 48-bit unique ID to the caller
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uint64_t get_unique_id();
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bool start_measurement(bool wait_for_setup);
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bool get_air_quality(uint16_t * eCO2, uint16_t * TVOC);
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bool get_air_quality_raw(uint16_t * rawH2, uint16_t * rawEthanol);
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bool soft_reset();
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bool get_baseline(uint16_t *eco2, uint16_t *tvoc);
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void set_baseline(uint16_t eco2, uint16_t tvoc);
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bool set_humidity(uint32_t absolute_humidity);
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// The most recent Total Volatile Organic Compounds in ppb and equivalent CO2 in ppm
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// uint16_t TVOC;
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// uint16_t eCO2;
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// The raw TVOC and eCO2 values - only really for chip testing
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// uint16_t rawTVOC;
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// uint16_t rawEthanol;
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// The 48-bit unique serial number for this chip, retrieved on init
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uint16_t serial_number[3];
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private:
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/***** Private methods here *****/
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bool write_global(uint16_t reg, uint16_t delay_ms);
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bool write_reg(uint16_t reg, uint16_t delay_ms);
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bool write_reg_1_word(uint16_t reg, uint16_t delay_ms, uint16_t value);
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bool write_reg_2_words(uint16_t reg, uint16_t delay_ms, uint16_t value1, uint16_t value2);
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bool read_reg_1_word(uint16_t reg, uint16_t delay_ms, uint16_t *value);
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bool read_reg_2_words(uint16_t reg, uint16_t delay_ms, uint16_t *value1, uint16_t *value2);
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bool read_reg_3_words(uint16_t reg, uint16_t delay_ms, uint16_t *value1, uint16_t *value2, uint16_t *value3);
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// bool read_word_from_command(uint8_t command[], uint8_t commandLength,
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// uint16_t delay, uint16_t *readdata = NULL,
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// uint8_t readlen = 0);
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// uint8_t generate_crc(uint8_t data[], uint8_t datalen);
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//
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uint8_t calculate_crc(uint16_t value);
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uint8_t calculate_crc(uint8_t value1, uint8_t value2);
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};
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}
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