航空研究会 / Mbed 2 deprecated AutoFlight2017_now_copy

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Dependencies:   HCSR04_2 MPU6050_2 mbed SDFileSystem3

Fork of AutoFlight2017_now_copy by Bot Furukawa

BMP280/BMP280.cpp@2:e7025f2cf0e1, 2018-09-08 (annotated)

Committer:
TUATBM
Date:
Sat Sep 08 09:21:46 2018 +0000
Revision:
2:e7025f2cf0e1
Parent:
0:92024886c0be 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
TUATBM 0:92024886c0be 1 /**
TUATBM 0:92024886c0be 2 * BMP280 Combined humidity and pressure sensor library
TUATBM 0:92024886c0be 3 *
TUATBM 0:92024886c0be 4 * @author Toyomasa Watarai
TUATBM 0:92024886c0be 5 * @version 1.0
TUATBM 0:92024886c0be 6 * @date 06-April-2015
TUATBM 0:92024886c0be 7 *
TUATBM 0:92024886c0be 8 * Library for "BMP280 temperature, humidity and pressure sensor module" from Switch Science
TUATBM 0:92024886c0be 9 * https://www.switch-science.com/catalog/2236/
TUATBM 0:92024886c0be 10 *
TUATBM 0:92024886c0be 11 * For more information about the BMP280:
TUATBM 0:92024886c0be 12 * http://ae-bst.resource.bosch.com/media/products/dokumente/BMP280/BST-BMP280_DS001-10.pdf
TUATBM 0:92024886c0be 13 */
TUATBM 0:92024886c0be 14
TUATBM 0:92024886c0be 15 #include "mbed.h"
TUATBM 0:92024886c0be 16 #include "BMP280.h"
TUATBM 0:92024886c0be 17
TUATBM 0:92024886c0be 18 BMP280::BMP280(PinName sda, PinName scl, char slave_adr)
TUATBM 0:92024886c0be 19 :
TUATBM 0:92024886c0be 20 i2c_p(new I2C(sda, scl)),
TUATBM 0:92024886c0be 21 i2c(*i2c_p),
TUATBM 0:92024886c0be 22 address(slave_adr),
TUATBM 0:92024886c0be 23 t_fine(0)
TUATBM 0:92024886c0be 24 {
TUATBM 0:92024886c0be 25 initialize();
TUATBM 0:92024886c0be 26 }
TUATBM 0:92024886c0be 27
TUATBM 0:92024886c0be 28 BMP280::BMP280(I2C &i2c_obj, char slave_adr)
TUATBM 0:92024886c0be 29 :
TUATBM 0:92024886c0be 30 i2c_p(NULL),
TUATBM 0:92024886c0be 31 i2c(i2c_obj),
TUATBM 0:92024886c0be 32 address(slave_adr),
TUATBM 0:92024886c0be 33 t_fine(0)
TUATBM 0:92024886c0be 34 {
TUATBM 0:92024886c0be 35 initialize();
TUATBM 0:92024886c0be 36 }
TUATBM 0:92024886c0be 37
TUATBM 0:92024886c0be 38 BMP280::~BMP280()
TUATBM 0:92024886c0be 39 {
TUATBM 0:92024886c0be 40 if (NULL != i2c_p)
TUATBM 0:92024886c0be 41 delete i2c_p;
TUATBM 0:92024886c0be 42 }
TUATBM 0:92024886c0be 43
TUATBM 0:92024886c0be 44 void BMP280::initialize()
TUATBM 0:92024886c0be 45 {
TUATBM 0:92024886c0be 46 char cmd[18];
TUATBM 0:92024886c0be 47
TUATBM 0:92024886c0be 48 cmd[0] = 0xf2; // ctrl_hum
TUATBM 0:92024886c0be 49 cmd[1] = 0x01; // Humidity oversampling x1
TUATBM 0:92024886c0be 50 i2c.write(address, cmd, 2);
TUATBM 0:92024886c0be 51
TUATBM 0:92024886c0be 52 cmd[0] = 0xf4; // ctrl_meas
TUATBM 0:92024886c0be 53 cmd[1] = 0x27; // Temparature oversampling x1, Pressure oversampling x1, Normal mode
TUATBM 0:92024886c0be 54 i2c.write(address, cmd, 2);
TUATBM 0:92024886c0be 55
TUATBM 0:92024886c0be 56 cmd[0] = 0xf5; // config
TUATBM 0:92024886c0be 57 cmd[1] = 0xa0; // Standby 1000ms, Filter off
TUATBM 0:92024886c0be 58 i2c.write(address, cmd, 2);
TUATBM 0:92024886c0be 59
TUATBM 0:92024886c0be 60 cmd[0] = 0x88; // read dig_T regs
TUATBM 0:92024886c0be 61 i2c.write(address, cmd, 1);
TUATBM 0:92024886c0be 62 i2c.read(address, cmd, 6);
TUATBM 0:92024886c0be 63
TUATBM 0:92024886c0be 64 dig_T1 = (cmd[1] << 8) | cmd[0];
TUATBM 0:92024886c0be 65 dig_T2 = (cmd[3] << 8) | cmd[2];
TUATBM 0:92024886c0be 66 dig_T3 = (cmd[5] << 8) | cmd[4];
TUATBM 0:92024886c0be 67
TUATBM 0:92024886c0be 68 DEBUG_PRINT("dig_T = 0x%x, 0x%x, 0x%x\n", dig_T1, dig_T2, dig_T3);
TUATBM 0:92024886c0be 69
TUATBM 0:92024886c0be 70 cmd[0] = 0x8E; // read dig_P regs
TUATBM 0:92024886c0be 71 i2c.write(address, cmd, 1);
TUATBM 0:92024886c0be 72 i2c.read(address, cmd, 18);
TUATBM 0:92024886c0be 73
TUATBM 0:92024886c0be 74 dig_P1 = (cmd[ 1] << 8) | cmd[ 0];
TUATBM 0:92024886c0be 75 dig_P2 = (cmd[ 3] << 8) | cmd[ 2];
TUATBM 0:92024886c0be 76 dig_P3 = (cmd[ 5] << 8) | cmd[ 4];
TUATBM 0:92024886c0be 77 dig_P4 = (cmd[ 7] << 8) | cmd[ 6];
TUATBM 0:92024886c0be 78 dig_P5 = (cmd[ 9] << 8) | cmd[ 8];
TUATBM 0:92024886c0be 79 dig_P6 = (cmd[11] << 8) | cmd[10];
TUATBM 0:92024886c0be 80 dig_P7 = (cmd[13] << 8) | cmd[12];
TUATBM 0:92024886c0be 81 dig_P8 = (cmd[15] << 8) | cmd[14];
TUATBM 0:92024886c0be 82 dig_P9 = (cmd[17] << 8) | cmd[16];
TUATBM 0:92024886c0be 83
TUATBM 0:92024886c0be 84 DEBUG_PRINT("dig_P = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_P1, dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9);
TUATBM 0:92024886c0be 85
TUATBM 0:92024886c0be 86 /* cmd[0] = 0xA1; // read dig_H regs
TUATBM 0:92024886c0be 87 i2c.write(address, cmd, 1);
TUATBM 0:92024886c0be 88 i2c.read(address, cmd, 1);
TUATBM 0:92024886c0be 89 cmd[1] = 0xE1; // read dig_H regs
TUATBM 0:92024886c0be 90 i2c.write(address, &cmd[1], 1);
TUATBM 0:92024886c0be 91 i2c.read(address, &cmd[1], 7);
TUATBM 0:92024886c0be 92
TUATBM 0:92024886c0be 93 dig_H1 = cmd[0];
TUATBM 0:92024886c0be 94 dig_H2 = (cmd[2] << 8) | cmd[1];
TUATBM 0:92024886c0be 95 dig_H3 = cmd[3];
TUATBM 0:92024886c0be 96 dig_H4 = (cmd[4] << 4) | (cmd[5] & 0x0f);
TUATBM 0:92024886c0be 97 dig_H5 = (cmd[6] << 4) | ((cmd[5]>>4) & 0x0f);
TUATBM 0:92024886c0be 98 dig_H6 = cmd[7];
TUATBM 0:92024886c0be 99
TUATBM 0:92024886c0be 100 DEBUG_PRINT("dig_H = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_H1, dig_H2, dig_H3, dig_H4, dig_H5, dig_H6);
TUATBM 0:92024886c0be 101 */
TUATBM 0:92024886c0be 102 }
TUATBM 0:92024886c0be 103
TUATBM 0:92024886c0be 104 float BMP280::getTemperature()
TUATBM 0:92024886c0be 105 {
TUATBM 0:92024886c0be 106 uint32_t temp_raw;
TUATBM 0:92024886c0be 107 float tempf;
TUATBM 0:92024886c0be 108 char cmd[4];
TUATBM 0:92024886c0be 109
TUATBM 0:92024886c0be 110 cmd[0] = 0xfa; // temp_msb
TUATBM 0:92024886c0be 111 i2c.write(address, cmd, 1);
TUATBM 0:92024886c0be 112 i2c.read(address, &cmd[1], 3);
TUATBM 0:92024886c0be 113
TUATBM 0:92024886c0be 114 temp_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
TUATBM 0:92024886c0be 115
TUATBM 0:92024886c0be 116 int32_t temp;
TUATBM 0:92024886c0be 117
TUATBM 0:92024886c0be 118 temp =
TUATBM 0:92024886c0be 119 (((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11) +
TUATBM 0:92024886c0be 120 ((((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - dig_T1)) >> 12) * dig_T3) >> 14);
TUATBM 0:92024886c0be 121
TUATBM 0:92024886c0be 122 t_fine = temp;
TUATBM 0:92024886c0be 123 temp = (temp * 5 + 128) >> 8;
TUATBM 0:92024886c0be 124 tempf = (float)temp;
TUATBM 0:92024886c0be 125
TUATBM 0:92024886c0be 126 return (tempf/100.0f);
TUATBM 0:92024886c0be 127 }
TUATBM 0:92024886c0be 128
TUATBM 0:92024886c0be 129 float BMP280::getPressure()
TUATBM 0:92024886c0be 130 {
TUATBM 0:92024886c0be 131 uint32_t press_raw;
TUATBM 0:92024886c0be 132 float pressf;
TUATBM 0:92024886c0be 133 char cmd[4];
TUATBM 0:92024886c0be 134
TUATBM 0:92024886c0be 135 cmd[0] = 0xf7; // press_msb
TUATBM 0:92024886c0be 136 i2c.write(address, cmd, 1);
TUATBM 0:92024886c0be 137 i2c.read(address, &cmd[1], 3);
TUATBM 0:92024886c0be 138
TUATBM 0:92024886c0be 139 press_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
TUATBM 0:92024886c0be 140
TUATBM 0:92024886c0be 141 int32_t var1, var2;
TUATBM 0:92024886c0be 142 uint32_t press;
TUATBM 0:92024886c0be 143
TUATBM 0:92024886c0be 144 var1 = (t_fine >> 1) - 64000;
TUATBM 0:92024886c0be 145 var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
TUATBM 0:92024886c0be 146 var2 = var2 + ((var1 * dig_P5) << 1);
TUATBM 0:92024886c0be 147 var2 = (var2 >> 2) + (dig_P4 << 16);
TUATBM 0:92024886c0be 148 var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
TUATBM 0:92024886c0be 149 var1 = ((32768 + var1) * dig_P1) >> 15;
TUATBM 0:92024886c0be 150 if (var1 == 0) {
TUATBM 0:92024886c0be 151 return 0;
TUATBM 0:92024886c0be 152 }
TUATBM 0:92024886c0be 153 press = (((1048576 - press_raw) - (var2 >> 12))) * 3125;
TUATBM 0:92024886c0be 154 if(press < 0x80000000) {
TUATBM 0:92024886c0be 155 press = (press << 1) / var1;
TUATBM 0:92024886c0be 156 } else {
TUATBM 0:92024886c0be 157 press = (press / var1) * 2;
TUATBM 0:92024886c0be 158 }
TUATBM 0:92024886c0be 159 var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
TUATBM 0:92024886c0be 160 var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
TUATBM 0:92024886c0be 161 press = (press + ((var1 + var2 + dig_P7) >> 4));
TUATBM 0:92024886c0be 162
TUATBM 0:92024886c0be 163 pressf = (float)press;
TUATBM 0:92024886c0be 164 return (pressf/100.0f);
TUATBM 0:92024886c0be 165 }