st-anything/lib/Adafruit_BMP280_Library/Adafruit_BMP280.h

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2023-03-11 14:11:03 +00:00
/*!
* @file Adafruit_BMP280.h
*
* This is a library for the Adafruit BMP280 Breakout.
*
* Designed specifically to work with the Adafruit BMP280 Breakout.
*
* Pick one up today in the adafruit shop!
* ------> https://www.adafruit.com/product/2651
*
* These sensors use I2C to communicate, 2 pins are required to interface.
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit andopen-source hardware by purchasing products
* from Adafruit!
*
* K.Townsend (Adafruit Industries)
*
* BSD license, all text above must be included in any redistribution
*/
#ifndef __BMP280_H__
#define __BMP280_H__
#include "Arduino.h"
#include <Wire.h>
#include <SPI.h>
/*!
* I2C ADDRESS/BITS/SETTINGS
*/
#define BMP280_ADDRESS (0x77) /**< The default I2C address for the sensor. */
#define BMP280_ADDRESS_ALT \
(0x76) /**< Alternative I2C address for the sensor. */
#define BMP280_CHIPID (0x58) /**< Default chip ID. */
/*!
* Registers available on the sensor.
*/
enum {
BMP280_REGISTER_DIG_T1 = 0x88,
BMP280_REGISTER_DIG_T2 = 0x8A,
BMP280_REGISTER_DIG_T3 = 0x8C,
BMP280_REGISTER_DIG_P1 = 0x8E,
BMP280_REGISTER_DIG_P2 = 0x90,
BMP280_REGISTER_DIG_P3 = 0x92,
BMP280_REGISTER_DIG_P4 = 0x94,
BMP280_REGISTER_DIG_P5 = 0x96,
BMP280_REGISTER_DIG_P6 = 0x98,
BMP280_REGISTER_DIG_P7 = 0x9A,
BMP280_REGISTER_DIG_P8 = 0x9C,
BMP280_REGISTER_DIG_P9 = 0x9E,
BMP280_REGISTER_CHIPID = 0xD0,
BMP280_REGISTER_VERSION = 0xD1,
BMP280_REGISTER_SOFTRESET = 0xE0,
BMP280_REGISTER_CAL26 = 0xE1, /**< R calibration = 0xE1-0xF0 */
BMP280_REGISTER_CONTROL = 0xF4,
BMP280_REGISTER_CONFIG = 0xF5,
BMP280_REGISTER_PRESSUREDATA = 0xF7,
BMP280_REGISTER_TEMPDATA = 0xFA,
};
/*!
* Struct to hold calibration data.
*/
typedef struct {
uint16_t dig_T1; /**< dig_T1 cal register. */
int16_t dig_T2; /**< dig_T2 cal register. */
int16_t dig_T3; /**< dig_T3 cal register. */
uint16_t dig_P1; /**< dig_P1 cal register. */
int16_t dig_P2; /**< dig_P2 cal register. */
int16_t dig_P3; /**< dig_P3 cal register. */
int16_t dig_P4; /**< dig_P4 cal register. */
int16_t dig_P5; /**< dig_P5 cal register. */
int16_t dig_P6; /**< dig_P6 cal register. */
int16_t dig_P7; /**< dig_P7 cal register. */
int16_t dig_P8; /**< dig_P8 cal register. */
int16_t dig_P9; /**< dig_P9 cal register. */
uint8_t dig_H1; /**< dig_H1 cal register. */
int16_t dig_H2; /**< dig_H2 cal register. */
uint8_t dig_H3; /**< dig_H3 cal register. */
int16_t dig_H4; /**< dig_H4 cal register. */
int16_t dig_H5; /**< dig_H5 cal register. */
int8_t dig_H6; /**< dig_H6 cal register. */
} bmp280_calib_data;
/**
* Driver for the Adafruit BMP280 barometric pressure sensor.
*/
class Adafruit_BMP280 {
public:
/** Oversampling rate for the sensor. */
enum sensor_sampling {
/** No over-sampling. */
SAMPLING_NONE = 0x00,
/** 1x over-sampling. */
SAMPLING_X1 = 0x01,
/** 2x over-sampling. */
SAMPLING_X2 = 0x02,
/** 4x over-sampling. */
SAMPLING_X4 = 0x03,
/** 8x over-sampling. */
SAMPLING_X8 = 0x04,
/** 16x over-sampling. */
SAMPLING_X16 = 0x05
};
/** Operating mode for the sensor. */
enum sensor_mode {
/** Sleep mode. */
MODE_SLEEP = 0x00,
/** Forced mode. */
MODE_FORCED = 0x01,
/** Normal mode. */
MODE_NORMAL = 0x03,
/** Software reset. */
MODE_SOFT_RESET_CODE = 0xB6
};
/** Filtering level for sensor data. */
enum sensor_filter {
/** No filtering. */
FILTER_OFF = 0x00,
/** 2x filtering. */
FILTER_X2 = 0x01,
/** 4x filtering. */
FILTER_X4 = 0x02,
/** 8x filtering. */
FILTER_X8 = 0x03,
/** 16x filtering. */
FILTER_X16 = 0x04
};
/** Standby duration in ms */
enum standby_duration {
/** 1 ms standby. */
STANDBY_MS_1 = 0x00,
/** 63 ms standby. */
STANDBY_MS_63 = 0x01,
/** 125 ms standby. */
STANDBY_MS_125 = 0x02,
/** 250 ms standby. */
STANDBY_MS_250 = 0x03,
/** 500 ms standby. */
STANDBY_MS_500 = 0x04,
/** 1000 ms standby. */
STANDBY_MS_1000 = 0x05,
/** 2000 ms standby. */
STANDBY_MS_2000 = 0x06,
/** 4000 ms standby. */
STANDBY_MS_4000 = 0x07
};
Adafruit_BMP280(TwoWire *theWire = &Wire);
Adafruit_BMP280(int8_t cspin, SPIClass *theSPI = &SPI);
Adafruit_BMP280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
bool begin(uint8_t addr = BMP280_ADDRESS, uint8_t chipid = BMP280_CHIPID);
float readTemperature();
float readPressure(void);
float readAltitude(float seaLevelhPa = 1013.25);
// void takeForcedMeasurement();
void setSampling(sensor_mode mode = MODE_NORMAL,
sensor_sampling tempSampling = SAMPLING_X16,
sensor_sampling pressSampling = SAMPLING_X16,
sensor_filter filter = FILTER_OFF,
standby_duration duration = STANDBY_MS_1);
TwoWire *_wire; /**< Wire object */
SPIClass *_spi; /**< SPI object */
private:
/** Encapsulates the config register */
struct config {
/** Inactive duration (standby time) in normal mode */
unsigned int t_sb : 3;
/** Filter settings */
unsigned int filter : 3;
/** Unused - don't set */
unsigned int none : 1;
/** Enables 3-wire SPI */
unsigned int spi3w_en : 1;
/** Used to retrieve the assembled config register's byte value. */
unsigned int get() { return (t_sb << 5) | (filter << 2) | spi3w_en; }
};
/** Encapsulates trhe ctrl_meas register */
struct ctrl_meas {
/** Temperature oversampling. */
unsigned int osrs_t : 3;
/** Pressure oversampling. */
unsigned int osrs_p : 3;
/** Device mode */
unsigned int mode : 2;
/** Used to retrieve the assembled ctrl_meas register's byte value. */
unsigned int get() { return (osrs_t << 5) | (osrs_p << 2) | mode; }
};
void readCoefficients(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);
int16_t readS16_LE(byte reg);
uint8_t _i2caddr;
int32_t _sensorID;
int32_t t_fine;
int8_t _cs, _mosi, _miso, _sck;
bmp280_calib_data _bmp280_calib;
config _configReg;
ctrl_meas _measReg;
};
#endif