FTE-denshi / Mbed 2 deprecated FTE-06

東北大学学友会準加盟団体 From The Earth の高高度ロケットFTE-06（通称：海豚）にて使用したソフトウェアです．ご自由にお使いください．このプログラムによって生じた損害について当団体は一切責任を負いません．また，各モジュールのライブラリは当団体が作成したものではないので再配布は禁止します．

Dependencies:   mbed FATFileSystem

Fork of FTE-06 by Tetsushi Amano

BMP085/BMP085.cpp@57:d78497a079cf, 2017-08-25 (annotated)

Committer:
mizuki_akaike
Date:
Fri Aug 25 03:42:30 2017 +0000
Revision:
57:d78497a079cf
Parent:
23:9be034083282 
??????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mizuki_akaike 23:9be034083282 1 /*
mizuki_akaike 23:9be034083282 2 * mbed library to use a Bosch Sensortec BMP085/BMP180 sensor
mizuki_akaike 23:9be034083282 3 * Copyright (c) 2010 Hiroshi Suga
mizuki_akaike 23:9be034083282 4 * Released under the MIT License: http://mbed.org/license/mit
mizuki_akaike 23:9be034083282 5 */
mizuki_akaike 23:9be034083282 6
mizuki_akaike 23:9be034083282 7 /** @file BMP085.cpp
mizuki_akaike 23:9be034083282 8 * @brief mbed library to use a Bosch Sensortec BMP085/BMP180 sensor
mizuki_akaike 23:9be034083282 9 * barometric pressure sensor BMP085/BMP180 (Bosch Sensortec)
mizuki_akaike 23:9be034083282 10 * interface: I2C digital
mizuki_akaike 23:9be034083282 11 */
mizuki_akaike 23:9be034083282 12
mizuki_akaike 23:9be034083282 13 #include "mbed.h"
mizuki_akaike 23:9be034083282 14 #include "BMP085.h"
mizuki_akaike 23:9be034083282 15
mizuki_akaike 23:9be034083282 16 #define WEATHER_BMP085 0xee
mizuki_akaike 23:9be034083282 17 #define xpow(x, y) ((long)1 << y)
mizuki_akaike 23:9be034083282 18
mizuki_akaike 23:9be034083282 19 /**
mizuki_akaike 23:9be034083282 20 * @brief Initializes interface (private I2C)
mizuki_akaike 23:9be034083282 21 * @param p_sda port of I2C SDA
mizuki_akaike 23:9be034083282 22 * @param p_scl port of I2C SCL
mizuki_akaike 23:9be034083282 23 * @param p_oss parameter of OSS
mizuki_akaike 23:9be034083282 24 */
mizuki_akaike 23:9be034083282 25 BMP085::BMP085 (PinName p_sda, PinName p_scl, BMP085_oss p_oss) : i2c(p_sda, p_scl) {
mizuki_akaike 23:9be034083282 26 init(p_oss);
mizuki_akaike 23:9be034083282 27 }
mizuki_akaike 23:9be034083282 28
mizuki_akaike 23:9be034083282 29 /**
mizuki_akaike 23:9be034083282 30 * @brief Initializes interface (public I2C)
mizuki_akaike 23:9be034083282 31 * @param p_i2c instance of I2C class
mizuki_akaike 23:9be034083282 32 * @param p_oss parameter of OSS
mizuki_akaike 23:9be034083282 33 */
mizuki_akaike 23:9be034083282 34 BMP085::BMP085 (I2C& p_i2c, BMP085_oss p_oss) : i2c(p_i2c) {
mizuki_akaike 23:9be034083282 35 init(p_oss);
mizuki_akaike 23:9be034083282 36 }
mizuki_akaike 23:9be034083282 37
mizuki_akaike 23:9be034083282 38 /**
mizuki_akaike 23:9be034083282 39 * @brief Get temperature
mizuki_akaike 23:9be034083282 40 * @return temperature (`C)
mizuki_akaike 23:9be034083282 41 */
mizuki_akaike 23:9be034083282 42 float BMP085::get_temperature() {
mizuki_akaike 23:9be034083282 43 return temperature;
mizuki_akaike 23:9be034083282 44 }
mizuki_akaike 23:9be034083282 45
mizuki_akaike 23:9be034083282 46 /**
mizuki_akaike 23:9be034083282 47 * @brief Get pressure
mizuki_akaike 23:9be034083282 48 * @return pressure (hPa)
mizuki_akaike 23:9be034083282 49 */
mizuki_akaike 23:9be034083282 50 float BMP085::get_pressure() {
mizuki_akaike 23:9be034083282 51 return pressure;
mizuki_akaike 23:9be034083282 52 }
mizuki_akaike 23:9be034083282 53
mizuki_akaike 23:9be034083282 54 /**
mizuki_akaike 23:9be034083282 55 * @brief Update results
mizuki_akaike 23:9be034083282 56 */
mizuki_akaike 23:9be034083282 57 void BMP085::update () {
mizuki_akaike 23:9be034083282 58 long t, p, ut, up, x1, x2, x3, b3, b5, b6;
mizuki_akaike 23:9be034083282 59 unsigned long b4, b7;
mizuki_akaike 23:9be034083282 60
mizuki_akaike 23:9be034083282 61 twi_writechar(WEATHER_BMP085, 0xf4, 0x2e);
mizuki_akaike 23:9be034083282 62 wait(0.01);
mizuki_akaike 23:9be034083282 63 ut = twi_readshort(WEATHER_BMP085, 0xf6);
mizuki_akaike 23:9be034083282 64
mizuki_akaike 23:9be034083282 65 twi_writechar(WEATHER_BMP085, 0xf4, 0x34 | (oss << 6));
mizuki_akaike 23:9be034083282 66 wait(0.05);
mizuki_akaike 23:9be034083282 67 up = twi_readlong(WEATHER_BMP085, 0xf6) >> (8 - oss);
mizuki_akaike 23:9be034083282 68
mizuki_akaike 23:9be034083282 69 x1 = (ut - ac6) * ac5 / xpow(2, 15);
mizuki_akaike 23:9be034083282 70 x2 = (long)mc * xpow(2, 11) / (x1 + md);
mizuki_akaike 23:9be034083282 71 b5 = x1 + x2;
mizuki_akaike 23:9be034083282 72 t = (b5 + 8) / xpow(2, 4);
mizuki_akaike 23:9be034083282 73 temperature = (float)t / 10.0;
mizuki_akaike 23:9be034083282 74
mizuki_akaike 23:9be034083282 75 b6 = b5 - 4000;
mizuki_akaike 23:9be034083282 76 x1 = (b2 * (b6 * b6 / xpow(2, 12))) / xpow(2, 11);
mizuki_akaike 23:9be034083282 77 x2 = ac2 * b6 / xpow(2, 11);
mizuki_akaike 23:9be034083282 78 x3 = x1 + x2;
mizuki_akaike 23:9be034083282 79 b3 = ((((unsigned long)ac1 * 4 + x3) << oss) + 2) / 4;
mizuki_akaike 23:9be034083282 80 x1 = ac3 * b6 / xpow(2, 13);
mizuki_akaike 23:9be034083282 81 x2 = (b1 * (b6 * b6 / xpow(2, 12))) / xpow(2, 16);
mizuki_akaike 23:9be034083282 82 x3 = ((x1 + x2) + 2) / xpow(2, 2);
mizuki_akaike 23:9be034083282 83 b4 = ac4 * (unsigned long)(x3 + 32768) / xpow(2, 15);
mizuki_akaike 23:9be034083282 84 b7 = ((unsigned long)up - b3) * (50000 >> oss);
mizuki_akaike 23:9be034083282 85 if (b7 < (unsigned long)0x80000000) {
mizuki_akaike 23:9be034083282 86 p = (b7 * 2) / b4;
mizuki_akaike 23:9be034083282 87 } else {
mizuki_akaike 23:9be034083282 88 p = (b7 / b4) * 2;
mizuki_akaike 23:9be034083282 89 }
mizuki_akaike 23:9be034083282 90 x1 = (p / xpow(2, 8)) * (p / xpow(2, 8));
mizuki_akaike 23:9be034083282 91 x1 = (x1 * 3038) / xpow(2, 16);
mizuki_akaike 23:9be034083282 92 x2 = (-7357 * p) / xpow(2, 16);
mizuki_akaike 23:9be034083282 93 p = p + (x1 + x2 + 3791) / xpow(2, 4);
mizuki_akaike 23:9be034083282 94 pressure = (float)p / 100.0;
mizuki_akaike 23:9be034083282 95 }
mizuki_akaike 23:9be034083282 96
mizuki_akaike 23:9be034083282 97 void BMP085::init (BMP085_oss p_oss) {
mizuki_akaike 23:9be034083282 98 ac1 = twi_readshort(WEATHER_BMP085, 0xaa);
mizuki_akaike 23:9be034083282 99 ac2 = twi_readshort(WEATHER_BMP085, 0xac);
mizuki_akaike 23:9be034083282 100 ac3 = twi_readshort(WEATHER_BMP085, 0xae);
mizuki_akaike 23:9be034083282 101 ac4 = twi_readshort(WEATHER_BMP085, 0xb0);
mizuki_akaike 23:9be034083282 102 ac5 = twi_readshort(WEATHER_BMP085, 0xb2);
mizuki_akaike 23:9be034083282 103 ac6 = twi_readshort(WEATHER_BMP085, 0xb4);
mizuki_akaike 23:9be034083282 104 b1 = twi_readshort(WEATHER_BMP085, 0xb6);
mizuki_akaike 23:9be034083282 105 b2 = twi_readshort(WEATHER_BMP085, 0xb8);
mizuki_akaike 23:9be034083282 106 mb = twi_readshort(WEATHER_BMP085, 0xba);
mizuki_akaike 23:9be034083282 107 mc = twi_readshort(WEATHER_BMP085, 0xbc);
mizuki_akaike 23:9be034083282 108 md = twi_readshort(WEATHER_BMP085, 0xbe);
mizuki_akaike 23:9be034083282 109 oss = p_oss;
mizuki_akaike 23:9be034083282 110 }
mizuki_akaike 23:9be034083282 111
mizuki_akaike 23:9be034083282 112 unsigned short BMP085::twi_readshort (int id, int addr) {
mizuki_akaike 23:9be034083282 113 unsigned short i;
mizuki_akaike 23:9be034083282 114
mizuki_akaike 23:9be034083282 115 i2c.start();
mizuki_akaike 23:9be034083282 116 i2c.write(id);
mizuki_akaike 23:9be034083282 117 i2c.write(addr);
mizuki_akaike 23:9be034083282 118
mizuki_akaike 23:9be034083282 119 i2c.start();
mizuki_akaike 23:9be034083282 120 i2c.write(id | 1);
mizuki_akaike 23:9be034083282 121 i = i2c.read(1) << 8;
mizuki_akaike 23:9be034083282 122 i |= i2c.read(0);
mizuki_akaike 23:9be034083282 123 i2c.stop();
mizuki_akaike 23:9be034083282 124
mizuki_akaike 23:9be034083282 125 return i;
mizuki_akaike 23:9be034083282 126 }
mizuki_akaike 23:9be034083282 127
mizuki_akaike 23:9be034083282 128 unsigned long BMP085::twi_readlong (int id, int addr) {
mizuki_akaike 23:9be034083282 129 unsigned long i;
mizuki_akaike 23:9be034083282 130
mizuki_akaike 23:9be034083282 131 i2c.start();
mizuki_akaike 23:9be034083282 132 i2c.write(id);
mizuki_akaike 23:9be034083282 133 i2c.write(addr);
mizuki_akaike 23:9be034083282 134
mizuki_akaike 23:9be034083282 135 i2c.start();
mizuki_akaike 23:9be034083282 136 i2c.write(id | 1);
mizuki_akaike 23:9be034083282 137 i = i2c.read(1) << 16;
mizuki_akaike 23:9be034083282 138 i |= i2c.read(1) << 8;
mizuki_akaike 23:9be034083282 139 i |= i2c.read(0);
mizuki_akaike 23:9be034083282 140 i2c.stop();
mizuki_akaike 23:9be034083282 141
mizuki_akaike 23:9be034083282 142 return i;
mizuki_akaike 23:9be034083282 143 }
mizuki_akaike 23:9be034083282 144
mizuki_akaike 23:9be034083282 145 void BMP085::twi_writechar (int id, int addr, int dat) {
mizuki_akaike 23:9be034083282 146
mizuki_akaike 23:9be034083282 147 i2c.start();
mizuki_akaike 23:9be034083282 148 i2c.write(id);
mizuki_akaike 23:9be034083282 149 i2c.write(addr);
mizuki_akaike 23:9be034083282 150 i2c.write(dat);
mizuki_akaike 23:9be034083282 151 i2c.stop();
mizuki_akaike 23:9be034083282 152 }