source: rtos_arduino/trunk/arduino_lib/libraries/LuckyShield/src/lib/BME280.h@ 175

Last change on this file since 175 was 175, checked in by ertl-honda, 8 years ago

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1/***************************************************************************
2 This is a library for the BME280 humidity, temperature & pressure sensor
3
4 Designed specifically to work with the Adafruit BME280 Breakout
5 ----> http://www.adafruit.com/products/2650
6
7 These sensors use I2C or SPI to communicate, 2 or 4 pins are required
8 to interface.
9
10 Adafruit invests time and resources providing this open source code,
11 please support Adafruit andopen-source hardware by purchasing products
12 from Adafruit!
13
14 Written by Limor Fried & Kevin Townsend for Adafruit Industries.
15 BSD license, all text above must be included in any redistribution
16
17
18 ***************************************************************************/
19#ifndef __BME280_H__
20#define __BME280_H__
21
22#if (ARDUINO >= 100)
23 #include "Arduino.h"
24#else
25 #include "WProgram.h"
26#endif
27
28#include <Wire.h>
29
30/*=========================================================================
31 I2C ADDRESS/BITS
32 -----------------------------------------------------------------------*/
33 #define BME280_ADDRESS (0x77)
34/*=========================================================================*/
35
36/*=========================================================================
37 REGISTERS
38 -----------------------------------------------------------------------*/
39 enum
40 {
41 BME280_REGISTER_DIG_T1 = 0x88,
42 BME280_REGISTER_DIG_T2 = 0x8A,
43 BME280_REGISTER_DIG_T3 = 0x8C,
44
45 BME280_REGISTER_DIG_P1 = 0x8E,
46 BME280_REGISTER_DIG_P2 = 0x90,
47 BME280_REGISTER_DIG_P3 = 0x92,
48 BME280_REGISTER_DIG_P4 = 0x94,
49 BME280_REGISTER_DIG_P5 = 0x96,
50 BME280_REGISTER_DIG_P6 = 0x98,
51 BME280_REGISTER_DIG_P7 = 0x9A,
52 BME280_REGISTER_DIG_P8 = 0x9C,
53 BME280_REGISTER_DIG_P9 = 0x9E,
54
55 BME280_REGISTER_DIG_H1 = 0xA1,
56 BME280_REGISTER_DIG_H2 = 0xE1,
57 BME280_REGISTER_DIG_H3 = 0xE3,
58 BME280_REGISTER_DIG_H4 = 0xE4,
59 BME280_REGISTER_DIG_H5 = 0xE5,
60 BME280_REGISTER_DIG_H6 = 0xE7,
61
62 BME280_REGISTER_CHIPID = 0xD0,
63 BME280_REGISTER_VERSION = 0xD1,
64 BME280_REGISTER_SOFTRESET = 0xE0,
65
66 BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
67
68 BME280_REGISTER_CONTROLHUMID = 0xF2,
69 BME280_REGISTER_CONTROL = 0xF4,
70 BME280_REGISTER_CONFIG = 0xF5,
71 BME280_REGISTER_PRESSUREDATA = 0xF7,
72 BME280_REGISTER_TEMPDATA = 0xFA,
73 BME280_REGISTER_HUMIDDATA = 0xFD,
74 };
75
76/*=========================================================================*/
77
78/*=========================================================================
79 CALIBRATION DATA
80 -----------------------------------------------------------------------*/
81 typedef struct
82 {
83 uint16_t dig_T1;
84 int16_t dig_T2;
85 int16_t dig_T3;
86
87 uint16_t dig_P1;
88 int16_t dig_P2;
89 int16_t dig_P3;
90 int16_t dig_P4;
91 int16_t dig_P5;
92 int16_t dig_P6;
93 int16_t dig_P7;
94 int16_t dig_P8;
95 int16_t dig_P9;
96
97 uint8_t dig_H1;
98 int16_t dig_H2;
99 uint8_t dig_H3;
100 int16_t dig_H4;
101 int16_t dig_H5;
102 int8_t dig_H6;
103 } bme280_calib_data;
104/*=========================================================================*/
105
106
107
108class BME280
109{
110 public:
111
112 bool begin(uint8_t addr = BME280_ADDRESS);
113 float temperature(void);
114 float pressure(void);
115 float humidity(void);
116 float altitude(float seaLevel);
117
118 private:
119
120 void readCoefficients(void);
121
122 void write8(byte reg, byte value);
123 uint8_t read8(byte reg);
124 uint16_t read16(byte reg);
125 uint32_t read24(byte reg);
126 int16_t readS16(byte reg);
127 uint16_t read16_LE(byte reg); // little endian
128 int16_t readS16_LE(byte reg); // little endian
129
130 uint8_t _i2caddr;
131 int32_t _sensorID;
132 int32_t t_fine;
133
134 bme280_calib_data _bme280_calib;
135
136};
137
138extern BME280 bme280;
139
140#endif
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