290 lines
8.7 KiB
C++
290 lines
8.7 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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#include "Arduino.h"
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#include <Adafruit_Sensor.h>
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#include <Wire.h>
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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_STATUS = 0XF3,
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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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public:
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enum sensor_sampling {
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SAMPLING_NONE = 0b000,
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SAMPLING_X1 = 0b001,
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SAMPLING_X2 = 0b010,
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SAMPLING_X4 = 0b011,
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SAMPLING_X8 = 0b100,
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SAMPLING_X16 = 0b101
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};
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enum sensor_mode {
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MODE_SLEEP = 0b00,
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MODE_FORCED = 0b01,
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MODE_NORMAL = 0b11
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};
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enum sensor_filter {
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FILTER_OFF = 0b000,
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FILTER_X2 = 0b001,
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FILTER_X4 = 0b010,
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FILTER_X8 = 0b011,
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FILTER_X16 = 0b100
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};
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// standby durations in ms
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enum standby_duration {
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STANDBY_MS_0_5 = 0b000,
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STANDBY_MS_10 = 0b110,
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STANDBY_MS_20 = 0b111,
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STANDBY_MS_62_5 = 0b001,
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STANDBY_MS_125 = 0b010,
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STANDBY_MS_250 = 0b011,
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STANDBY_MS_500 = 0b100,
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STANDBY_MS_1000 = 0b101
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};
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// constructors
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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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void setSampling(sensor_mode mode = MODE_NORMAL,
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sensor_sampling tempSampling = SAMPLING_X16,
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sensor_sampling pressSampling = SAMPLING_X16,
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sensor_sampling humSampling = SAMPLING_X16,
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sensor_filter filter = FILTER_OFF,
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standby_duration duration = STANDBY_MS_0_5
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);
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void takeForcedMeasurement();
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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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float seaLevelForAltitude(float altitude, float pressure);
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private:
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void readCoefficients(void);
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bool isReadingCalibration(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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uint32_t read24(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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bme280_calib_data _bme280_calib;
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// The config register
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struct config {
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// inactive duration (standby time) in normal mode
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// 000 = 0.5 ms
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// 001 = 62.5 ms
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// 010 = 125 ms
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// 011 = 250 ms
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// 100 = 500 ms
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// 101 = 1000 ms
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// 110 = 10 ms
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// 111 = 20 ms
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unsigned int t_sb : 3;
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// filter settings
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// 000 = filter off
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// 001 = 2x filter
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// 010 = 4x filter
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// 011 = 8x filter
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// 100 and above = 16x filter
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unsigned int filter : 3;
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// unused - don't set
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unsigned int none : 1;
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unsigned int spi3w_en : 1;
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unsigned int get() {
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return (t_sb << 5) | (filter << 3) | spi3w_en;
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}
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};
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config _configReg;
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// The ctrl_meas register
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struct ctrl_meas {
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// temperature oversampling
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// 000 = skipped
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// 001 = x1
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// 010 = x2
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// 011 = x4
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// 100 = x8
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// 101 and above = x16
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unsigned int osrs_t : 3;
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// pressure oversampling
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// 000 = skipped
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// 001 = x1
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// 010 = x2
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// 011 = x4
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// 100 = x8
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// 101 and above = x16
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unsigned int osrs_p : 3;
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// device mode
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// 00 = sleep
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// 01 or 10 = forced
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// 11 = normal
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unsigned int mode : 2;
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unsigned int get() {
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return (osrs_t << 5) | (osrs_p << 3) | mode;
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}
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};
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ctrl_meas _measReg;
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// The ctrl_hum register
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struct ctrl_hum {
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// unused - don't set
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unsigned int none : 5;
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// pressure oversampling
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// 000 = skipped
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// 001 = x1
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// 010 = x2
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// 011 = x4
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// 100 = x8
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// 101 and above = x16
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unsigned int osrs_h : 3;
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unsigned int get() {
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return (osrs_h);
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}
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};
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ctrl_hum _humReg;
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};
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#endif
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