scd30.h

#pragma once

// Credit: Adafruit SCD30 library

#include "i2c.h"
#include "scd30_defs.h"

struct SCD30: private I2C {
	bool begun = false;
	float carbonDioxide = 0.f;
	float temperature = 0.f;
	float relativeHumidity = 0.f;

	using I2C::I2C;
	SCD30();

	bool begin(int32_t sensor_id = 0);
	bool beginIfNecessary();

	void resetData();
	bool readData();

	/** Performs a software reset initializing registers to their power on state. */
	void resetSensor();

	/** Asks the sensor whether new data is ready to read. */
	bool dataReady();

	/** Set the amount of time between measurements in seconds. Must be from 2 to
	 *  1800 seconds. The default value set on sensor initialization is 2 seconds. */
	bool setMeasurementInterval(uint16_t interval);

	/** Reads the current amount of time between measurements in seconds. */
	uint16_t getMeasurementInterval();

	/** Gets the enabled status of the SCD30's self calibration routine. */
	bool selfCalibrationEnabled();

	/** Enable or disable the SCD30's self calibration routine. */
	bool selfCalibrationEnabled(bool enabled);

	/** @brief Tell the SCD30 to start taking measurements continuously
	 *  @param pressure an optional pressure offset to correct for in millibar (mBar)
	 *  @return true: success false: failure */
	bool startContinuousMeasurement(uint16_t pressure = 0);

	/** Read the current ambient pressure offset in millibar. */
	uint16_t getAmbientPressureOffset();

	/** Sets the altitude offset (in meters above sea level) that the SCD30 should correct for.
	 *  This value is saved to the SCD30's internal storage and is reloaded on sensor power up. */
	bool setAltitudeOffset(uint16_t altitude);

	/** Get the current altitude offset value in meters above sea level. */
	uint16_t getAltitudeOffset();

	/**
	 * @brief Set a temperature offset
	 *
	 * @param temp_offset The **positive** temperature offset to set in hundreths of
	 * a degree C ie:
	 *
	 * 1015 => 10.15 degrees C
	 * 31337 => 313.37 degrees C
	 *
	 * **Note:** This value is saved to the SCD30's internal storage and is reloaded
	 * on sensor power up.
	 * @return true: success false: failure
	 */
	bool setTemperatureOffset(uint16_t temp_offset);

	/** Gets the current temperature offset in hundreths of a degree C. */
	uint16_t getTemperatureOffset();

	/**
	 * @brief Force the SCD30 to recalibrate with a given reference value
	 *
	 * @param reference The calibration reference value in ppm from
	 * 400-2000 ppm.
	 *
	 * **Note:** This value is saved to the SCD30's internal storage and is reloaded
	 * on sensor power up.
	 *
	 * **Setting a reference value and forcing recalibration will override any
	 * previous automatic self-calibration.**
	 * @return true: success false: failure
	 */
	bool forceRecalibrationWithReference(uint16_t reference);

	/**
	 * @brief Get the current forced recalibration reference value
	 * @return uint16_t The current reference value in ppm
	 */
	uint16_t getForcedCalibrationReference();

	private:
		int8_t interfaceResult = SCD30_OK;
		uint8_t chipID = 0;
		uint16_t sensorIDHumidity = 0;
		uint16_t sensorIDTemp = 0;

		bool init(int32_t sensor_id);
		bool sendCommand(uint16_t command);
		bool sendCommand(uint16_t command, uint16_t argument);
		uint16_t readRegister(uint16_t reg_addr);
		uint32_t millis() const;
};