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/*!
* @file Adafruit_BME280.h
*
* Designed specifically to work with the Adafruit BME280 Breakout
* ----> http://www.adafruit.com/products/2650
*
* These sensors use I2C or SPI to communicate, 2 or 4 pins are required
* to interface.
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit and open-source hardware by purchasing
* products from Adafruit!
*
* Written by Kevin "KTOWN" Townsend for Adafruit Industries.
*
* BSD license, all text here must be included in any redistribution.
* See the LICENSE file for details.
*
*/
#ifndef __BME280_H__
#define __BME280_H__
#include "Arduino.h"
#include <Adafruit_Sensor.h>
#include <SPI.h>
#include <Wire.h>
/*!
* @brief default I2C address
*/
#define BME280_ADDRESS (0x77) // Primary I2C Address
/*!
* @brief alternate I2C address
*/
#define BME280_ADDRESS_ALTERNATE (0x76) // Alternate Address
/*!
* @brief Register addresses
*/
enum {
BME280_REGISTER_DIG_T1 = 0x88,
BME280_REGISTER_DIG_T2 = 0x8A,
BME280_REGISTER_DIG_T3 = 0x8C,
BME280_REGISTER_DIG_P1 = 0x8E,
BME280_REGISTER_DIG_P2 = 0x90,
BME280_REGISTER_DIG_P3 = 0x92,
BME280_REGISTER_DIG_P4 = 0x94,
BME280_REGISTER_DIG_P5 = 0x96,
BME280_REGISTER_DIG_P6 = 0x98,
BME280_REGISTER_DIG_P7 = 0x9A,
BME280_REGISTER_DIG_P8 = 0x9C,
BME280_REGISTER_DIG_P9 = 0x9E,
BME280_REGISTER_DIG_H1 = 0xA1,
BME280_REGISTER_DIG_H2 = 0xE1,
BME280_REGISTER_DIG_H3 = 0xE3,
BME280_REGISTER_DIG_H4 = 0xE4,
BME280_REGISTER_DIG_H5 = 0xE5,
BME280_REGISTER_DIG_H6 = 0xE7,
BME280_REGISTER_CHIPID = 0xD0,
BME280_REGISTER_VERSION = 0xD1,
BME280_REGISTER_SOFTRESET = 0xE0,
BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
BME280_REGISTER_CONTROLHUMID = 0xF2,
BME280_REGISTER_STATUS = 0XF3,
BME280_REGISTER_CONTROL = 0xF4,
BME280_REGISTER_CONFIG = 0xF5,
BME280_REGISTER_PRESSUREDATA = 0xF7,
BME280_REGISTER_TEMPDATA = 0xFA,
BME280_REGISTER_HUMIDDATA = 0xFD
};
/**************************************************************************/
/*!
@brief calibration data
*/
/**************************************************************************/
typedef struct {
uint16_t dig_T1; ///< temperature compensation value
int16_t dig_T2; ///< temperature compensation value
int16_t dig_T3; ///< temperature compensation value
uint16_t dig_P1; ///< pressure compensation value
int16_t dig_P2; ///< pressure compensation value
int16_t dig_P3; ///< pressure compensation value
int16_t dig_P4; ///< pressure compensation value
int16_t dig_P5; ///< pressure compensation value
int16_t dig_P6; ///< pressure compensation value
int16_t dig_P7; ///< pressure compensation value
int16_t dig_P8; ///< pressure compensation value
int16_t dig_P9; ///< pressure compensation value
uint8_t dig_H1; ///< humidity compensation value
int16_t dig_H2; ///< humidity compensation value
uint8_t dig_H3; ///< humidity compensation value
int16_t dig_H4; ///< humidity compensation value
int16_t dig_H5; ///< humidity compensation value
int8_t dig_H6; ///< humidity compensation value
} bme280_calib_data;
/*=========================================================================*/
class Adafruit_BME280;
/** Adafruit Unified Sensor interface for temperature component of BME280 */
class Adafruit_BME280_Temp : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the temp sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Temp(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/** Adafruit Unified Sensor interface for pressure component of BME280 */
class Adafruit_BME280_Pressure : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the pressure sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Pressure(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/** Adafruit Unified Sensor interface for humidity component of BME280 */
class Adafruit_BME280_Humidity : public Adafruit_Sensor {
public:
/** @brief Create an Adafruit_Sensor compatible object for the humidity sensor
@param parent A pointer to the BME280 class */
Adafruit_BME280_Humidity(Adafruit_BME280 *parent) { _theBME280 = parent; }
bool getEvent(sensors_event_t *);
void getSensor(sensor_t *);
private:
int _sensorID = 280;
Adafruit_BME280 *_theBME280 = NULL;
};
/**************************************************************************/
/*!
@brief Class that stores state and functions for interacting with BME280 IC
*/
/**************************************************************************/
class Adafruit_BME280 {
public:
/**************************************************************************/
/*!
@brief sampling rates
*/
/**************************************************************************/
enum sensor_sampling {
SAMPLING_NONE = 0b000,
SAMPLING_X1 = 0b001,
SAMPLING_X2 = 0b010,
SAMPLING_X4 = 0b011,
SAMPLING_X8 = 0b100,
SAMPLING_X16 = 0b101
};
/**************************************************************************/
/*!
@brief power modes
*/
/**************************************************************************/
enum sensor_mode {
MODE_SLEEP = 0b00,
MODE_FORCED = 0b01,
MODE_NORMAL = 0b11
};
/**************************************************************************/
/*!
@brief filter values
*/
/**************************************************************************/
enum sensor_filter {
FILTER_OFF = 0b000,
FILTER_X2 = 0b001,
FILTER_X4 = 0b010,
FILTER_X8 = 0b011,
FILTER_X16 = 0b100
};
/**************************************************************************/
/*!
@brief standby duration in ms
*/
/**************************************************************************/
enum standby_duration {
STANDBY_MS_0_5 = 0b000,
STANDBY_MS_10 = 0b110,
STANDBY_MS_20 = 0b111,
STANDBY_MS_62_5 = 0b001,
STANDBY_MS_125 = 0b010,
STANDBY_MS_250 = 0b011,
STANDBY_MS_500 = 0b100,
STANDBY_MS_1000 = 0b101
};
// constructors
Adafruit_BME280();
Adafruit_BME280(int8_t cspin, SPIClass *theSPI = &SPI);
Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
~Adafruit_BME280(void);
bool begin(uint8_t addr = BME280_ADDRESS, TwoWire *theWire = &Wire);
bool init();
void setSampling(sensor_mode mode = MODE_NORMAL,
sensor_sampling tempSampling = SAMPLING_X16,
sensor_sampling pressSampling = SAMPLING_X16,
sensor_sampling humSampling = SAMPLING_X16,
sensor_filter filter = FILTER_OFF,
standby_duration duration = STANDBY_MS_0_5);
void takeForcedMeasurement();
float readTemperature(void);
float readPressure(void);
float readHumidity(void);
float readAltitude(float seaLevel);
float seaLevelForAltitude(float altitude, float pressure);
uint32_t sensorID(void);
Adafruit_Sensor *getTemperatureSensor(void);
Adafruit_Sensor *getPressureSensor(void);
Adafruit_Sensor *getHumiditySensor(void);
protected:
TwoWire *_wire; //!< pointer to a TwoWire object
SPIClass *_spi; //!< pointer to SPI object
Adafruit_BME280_Temp *temp_sensor = NULL;
//!< Adafruit_Sensor compat temperature sensor component
Adafruit_BME280_Pressure *pressure_sensor = NULL;
//!< Adafruit_Sensor compat pressure sensor component
Adafruit_BME280_Humidity *humidity_sensor = NULL;
//!< Adafruit_Sensor compat humidity sensor component
void readCoefficients(void);
bool isReadingCalibration(void);
uint8_t spixfer(uint8_t x);
void write8(byte reg, byte value);
uint8_t read8(byte reg);
uint16_t read16(byte reg);
uint32_t read24(byte reg);
int16_t readS16(byte reg);
uint16_t read16_LE(byte reg); // little endian
int16_t readS16_LE(byte reg); // little endian
uint8_t _i2caddr; //!< I2C addr for the TwoWire interface
int32_t _sensorID; //!< ID of the BME Sensor
int32_t t_fine; //!< temperature with high resolution, stored as an attribute
//!< as this is used for temperature compensation reading
//!< humidity and pressure
int8_t _cs; //!< for the SPI interface
int8_t _mosi; //!< for the SPI interface
int8_t _miso; //!< for the SPI interface
int8_t _sck; //!< for the SPI interface
bme280_calib_data _bme280_calib; //!< here calibration data is stored
/**************************************************************************/
/*!
@brief config register
*/
/**************************************************************************/
struct config {
// inactive duration (standby time) in normal mode
// 000 = 0.5 ms
// 001 = 62.5 ms
// 010 = 125 ms
// 011 = 250 ms
// 100 = 500 ms
// 101 = 1000 ms
// 110 = 10 ms
// 111 = 20 ms
unsigned int t_sb : 3; ///< inactive duration (standby time) in normal mode
// filter settings
// 000 = filter off
// 001 = 2x filter
// 010 = 4x filter
// 011 = 8x filter
// 100 and above = 16x filter
unsigned int filter : 3; ///< filter settings
// unused - don't set
unsigned int none : 1; ///< unused - don't set
unsigned int spi3w_en : 1; ///< unused - don't set
/// @return combined config register
unsigned int get() { return (t_sb << 5) | (filter << 2) | spi3w_en; }
};
config _configReg; //!< config register object
/**************************************************************************/
/*!
@brief ctrl_meas register
*/
/**************************************************************************/
struct ctrl_meas {
// temperature oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_t : 3; ///< temperature oversampling
// pressure oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_p : 3; ///< pressure oversampling
// device mode
// 00 = sleep
// 01 or 10 = forced
// 11 = normal
unsigned int mode : 2; ///< device mode
/// @return combined ctrl register
unsigned int get() { return (osrs_t << 5) | (osrs_p << 2) | mode; }
};
ctrl_meas _measReg; //!< measurement register object
/**************************************************************************/
/*!
@brief ctrl_hum register
*/
/**************************************************************************/
struct ctrl_hum {
/// unused - don't set
unsigned int none : 5;
// pressure oversampling
// 000 = skipped
// 001 = x1
// 010 = x2
// 011 = x4
// 100 = x8
// 101 and above = x16
unsigned int osrs_h : 3; ///< pressure oversampling
/// @return combined ctrl hum register
unsigned int get() { return (osrs_h); }
};
ctrl_hum _humReg; //!< hum register object
};
#endif
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