166 lines
4.9 KiB
C++
166 lines
4.9 KiB
C++
/***************************************************************************
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This is a library for the BME280 humidity, temperature & pressure sensor
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Designed specifically to work with the Adafruit BME280 Breakout
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----> http://www.adafruit.com/products/2650
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These sensors use I2C or SPI to communicate, 2 or 4 pins are required
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to interface.
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Adafruit invests time and resources providing this open source code,
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please support Adafruit andopen-source hardware by purchasing products
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from Adafruit!
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Written by Limor Fried & Kevin Townsend for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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***************************************************************************/
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#ifndef __BME280_H__
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#define __BME280_H__
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#if (ARDUINO >= 100)
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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#include <Adafruit_Sensor.h>
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#ifdef __AVR_ATtiny85__
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#include "TinyWireM.h"
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#define Wire TinyWireM
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#else
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#include <Wire.h>
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#endif
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/*=========================================================================
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I2C ADDRESS/BITS
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-----------------------------------------------------------------------*/
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#define BME280_ADDRESS (0x77)
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/*=========================================================================*/
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/*=========================================================================
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REGISTERS
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-----------------------------------------------------------------------*/
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enum
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{
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BME280_REGISTER_DIG_T1 = 0x88,
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BME280_REGISTER_DIG_T2 = 0x8A,
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BME280_REGISTER_DIG_T3 = 0x8C,
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BME280_REGISTER_DIG_P1 = 0x8E,
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BME280_REGISTER_DIG_P2 = 0x90,
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BME280_REGISTER_DIG_P3 = 0x92,
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BME280_REGISTER_DIG_P4 = 0x94,
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BME280_REGISTER_DIG_P5 = 0x96,
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BME280_REGISTER_DIG_P6 = 0x98,
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BME280_REGISTER_DIG_P7 = 0x9A,
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BME280_REGISTER_DIG_P8 = 0x9C,
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BME280_REGISTER_DIG_P9 = 0x9E,
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BME280_REGISTER_DIG_H1 = 0xA1,
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BME280_REGISTER_DIG_H2 = 0xE1,
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BME280_REGISTER_DIG_H3 = 0xE3,
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BME280_REGISTER_DIG_H4 = 0xE4,
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BME280_REGISTER_DIG_H5 = 0xE5,
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BME280_REGISTER_DIG_H6 = 0xE7,
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BME280_REGISTER_CHIPID = 0xD0,
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BME280_REGISTER_VERSION = 0xD1,
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BME280_REGISTER_SOFTRESET = 0xE0,
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BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
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BME280_REGISTER_CONTROLHUMID = 0xF2,
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BME280_REGISTER_CONTROL = 0xF4,
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BME280_REGISTER_CONFIG = 0xF5,
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BME280_REGISTER_PRESSUREDATA = 0xF7,
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BME280_REGISTER_TEMPDATA = 0xFA,
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BME280_REGISTER_HUMIDDATA = 0xFD,
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};
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/*=========================================================================*/
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/*=========================================================================
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CALIBRATION DATA
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-----------------------------------------------------------------------*/
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typedef struct
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{
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uint16_t dig_T1;
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int16_t dig_T2;
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int16_t dig_T3;
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uint16_t dig_P1;
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int16_t dig_P2;
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int16_t dig_P3;
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int16_t dig_P4;
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int16_t dig_P5;
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int16_t dig_P6;
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int16_t dig_P7;
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int16_t dig_P8;
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int16_t dig_P9;
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uint8_t dig_H1;
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int16_t dig_H2;
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uint8_t dig_H3;
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int16_t dig_H4;
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int16_t dig_H5;
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int8_t dig_H6;
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} bme280_calib_data;
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/*=========================================================================*/
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/*
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class Adafruit_BME280_Unified : public Adafruit_Sensor
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{
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public:
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Adafruit_BME280_Unified(int32_t sensorID = -1);
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bool begin(uint8_t addr = BME280_ADDRESS);
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void getTemperature(float *temp);
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void getPressure(float *pressure);
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float pressureToAltitude(float seaLevel, float atmospheric, float temp);
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float seaLevelForAltitude(float altitude, float atmospheric, float temp);
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void getEvent(sensors_event_t*);
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void getSensor(sensor_t*);
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private:
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uint8_t _i2c_addr;
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int32_t _sensorID;
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};
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*/
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class Adafruit_BME280
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{
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public:
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Adafruit_BME280(void);
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Adafruit_BME280(int8_t cspin);
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Adafruit_BME280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
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bool begin(uint8_t addr = BME280_ADDRESS);
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float readTemperature(void);
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float readPressure(void);
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float readHumidity(void);
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float readAltitude(float seaLevel);
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private:
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void readCoefficients(void);
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uint8_t spixfer(uint8_t x);
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void write8(byte reg, byte value);
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uint8_t read8(byte reg);
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uint16_t read16(byte reg);
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int16_t readS16(byte reg);
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uint16_t read16_LE(byte reg); // little endian
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int16_t readS16_LE(byte reg); // little endian
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uint8_t _i2caddr;
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int32_t _sensorID;
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int32_t t_fine;
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int8_t _cs, _mosi, _miso, _sck;
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};
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#endif
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