ittraining_project_2016 / Nucleo_i2c_OLED_BME280_copy

testing

Dependencies:   ESP8266_Test_WIFI mbed-src

include/BME280.cpp@3:f0f39d7c1c16, 2016-06-28 (annotated)

Committer:
hank51017
Date:
Tue Jun 28 11:03:39 2016 +0000
Revision:
3:f0f39d7c1c16
Parent:
2:dcaf0bcf6df6 
for yotta;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hank51017 1:6f0b395c052d 1 /**
hank51017 1:6f0b395c052d 2 * BME280 Combined humidity and pressure sensor library
hank51017 1:6f0b395c052d 3 *
hank51017 1:6f0b395c052d 4 * @author Toyomasa Watarai
hank51017 1:6f0b395c052d 5 * @version 1.0
hank51017 1:6f0b395c052d 6 * @date 06-April-2015
hank51017 1:6f0b395c052d 7 *
hank51017 1:6f0b395c052d 8 * Library for "BME280 temperature, humidity and pressure sensor module" from Switch Science
hank51017 1:6f0b395c052d 9 * https://www.switch-science.com/catalog/2236/
hank51017 1:6f0b395c052d 10 *
hank51017 1:6f0b395c052d 11 * For more information about the BME280:
hank51017 1:6f0b395c052d 12 * http://ae-bst.resource.bosch.com/media/products/dokumente/bme280/BST-BME280_DS001-10.pdf
hank51017 1:6f0b395c052d 13 */
hank51017 1:6f0b395c052d 14
hank51017 1:6f0b395c052d 15 #include "mbed.h"
hank51017 1:6f0b395c052d 16 #include "BME280.h"
hank51017 1:6f0b395c052d 17
hank51017 1:6f0b395c052d 18 BME280::BME280(PinName sda, PinName scl, char slave_adr)
hank51017 1:6f0b395c052d 19 :
hank51017 1:6f0b395c052d 20 i2c_p(new I2C(sda, scl)),
hank51017 1:6f0b395c052d 21 i2c(*i2c_p),
hank51017 1:6f0b395c052d 22 address(slave_adr),
hank51017 1:6f0b395c052d 23 t_fine(0)
hank51017 1:6f0b395c052d 24 {
hank51017 1:6f0b395c052d 25 initialize();
hank51017 1:6f0b395c052d 26 }
hank51017 1:6f0b395c052d 27
hank51017 1:6f0b395c052d 28 BME280::BME280(I2C &i2c_obj, char slave_adr)
hank51017 1:6f0b395c052d 29 :
hank51017 1:6f0b395c052d 30 i2c_p(NULL),
hank51017 1:6f0b395c052d 31 i2c(i2c_obj),
hank51017 1:6f0b395c052d 32 address(slave_adr),
hank51017 1:6f0b395c052d 33 t_fine(0)
hank51017 1:6f0b395c052d 34 {
hank51017 1:6f0b395c052d 35 initialize();
hank51017 1:6f0b395c052d 36 }
hank51017 1:6f0b395c052d 37
hank51017 1:6f0b395c052d 38 BME280::~BME280()
hank51017 1:6f0b395c052d 39 {
hank51017 1:6f0b395c052d 40 if (NULL != i2c_p)
hank51017 1:6f0b395c052d 41 delete i2c_p;
hank51017 1:6f0b395c052d 42 }
hank51017 1:6f0b395c052d 43
hank51017 1:6f0b395c052d 44 void BME280::initialize()
hank51017 1:6f0b395c052d 45 {
hank51017 1:6f0b395c052d 46 char cmd[18];
hank51017 1:6f0b395c052d 47
hank51017 1:6f0b395c052d 48 cmd[0] = 0xf2; // ctrl_hum
hank51017 1:6f0b395c052d 49 cmd[1] = 0x01; // Humidity oversampling x1
hank51017 1:6f0b395c052d 50 i2c.write(address, cmd, 2);
hank51017 1:6f0b395c052d 51
hank51017 1:6f0b395c052d 52 cmd[0] = 0xf4; // ctrl_meas
hank51017 3:f0f39d7c1c16 53 cmd[1] = 0xab; // Temparature oversampling x2, Pressure oversampling x16, Normal mode
hank51017 1:6f0b395c052d 54 i2c.write(address, cmd, 2);
hank51017 1:6f0b395c052d 55
hank51017 1:6f0b395c052d 56 cmd[0] = 0xf5; // config
hank51017 3:f0f39d7c1c16 57 cmd[1] = 0x10; // Standby 0.5ms, Filter 16
hank51017 1:6f0b395c052d 58 i2c.write(address, cmd, 2);
hank51017 1:6f0b395c052d 59
hank51017 1:6f0b395c052d 60 cmd[0] = 0x88; // read dig_T regs
hank51017 1:6f0b395c052d 61 i2c.write(address, cmd, 1);
hank51017 1:6f0b395c052d 62 i2c.read(address, cmd, 6);
hank51017 1:6f0b395c052d 63
hank51017 1:6f0b395c052d 64 dig_T1 = (cmd[1] << 8) | cmd[0];
hank51017 1:6f0b395c052d 65 dig_T2 = (cmd[3] << 8) | cmd[2];
hank51017 1:6f0b395c052d 66 dig_T3 = (cmd[5] << 8) | cmd[4];
hank51017 1:6f0b395c052d 67
hank51017 1:6f0b395c052d 68 DEBUG_PRINT("dig_T = 0x%x, 0x%x, 0x%x\n", dig_T1, dig_T2, dig_T3);
hank51017 1:6f0b395c052d 69
hank51017 1:6f0b395c052d 70 cmd[0] = 0x8E; // read dig_P regs
hank51017 1:6f0b395c052d 71 i2c.write(address, cmd, 1);
hank51017 1:6f0b395c052d 72 i2c.read(address, cmd, 18);
hank51017 1:6f0b395c052d 73
hank51017 1:6f0b395c052d 74 dig_P1 = (cmd[ 1] << 8) | cmd[ 0];
hank51017 1:6f0b395c052d 75 dig_P2 = (cmd[ 3] << 8) | cmd[ 2];
hank51017 1:6f0b395c052d 76 dig_P3 = (cmd[ 5] << 8) | cmd[ 4];
hank51017 1:6f0b395c052d 77 dig_P4 = (cmd[ 7] << 8) | cmd[ 6];
hank51017 1:6f0b395c052d 78 dig_P5 = (cmd[ 9] << 8) | cmd[ 8];
hank51017 1:6f0b395c052d 79 dig_P6 = (cmd[11] << 8) | cmd[10];
hank51017 1:6f0b395c052d 80 dig_P7 = (cmd[13] << 8) | cmd[12];
hank51017 1:6f0b395c052d 81 dig_P8 = (cmd[15] << 8) | cmd[14];
hank51017 1:6f0b395c052d 82 dig_P9 = (cmd[17] << 8) | cmd[16];
hank51017 1:6f0b395c052d 83
hank51017 1:6f0b395c052d 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);
hank51017 1:6f0b395c052d 85
hank51017 1:6f0b395c052d 86 cmd[0] = 0xA1; // read dig_H regs
hank51017 1:6f0b395c052d 87 i2c.write(address, cmd, 1);
hank51017 1:6f0b395c052d 88 i2c.read(address, cmd, 1);
hank51017 1:6f0b395c052d 89 cmd[1] = 0xE1; // read dig_H regs
hank51017 1:6f0b395c052d 90 i2c.write(address, &cmd[1], 1);
hank51017 1:6f0b395c052d 91 i2c.read(address, &cmd[1], 7);
hank51017 1:6f0b395c052d 92
hank51017 1:6f0b395c052d 93 dig_H1 = cmd[0];
hank51017 1:6f0b395c052d 94 dig_H2 = (cmd[2] << 8) | cmd[1];
hank51017 1:6f0b395c052d 95 dig_H3 = cmd[3];
hank51017 1:6f0b395c052d 96 dig_H4 = (cmd[4] << 4) | (cmd[5] & 0x0f);
hank51017 1:6f0b395c052d 97 dig_H5 = (cmd[6] << 4) | ((cmd[5]>>4) & 0x0f);
hank51017 1:6f0b395c052d 98 dig_H6 = cmd[7];
hank51017 1:6f0b395c052d 99
hank51017 1:6f0b395c052d 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);
hank51017 1:6f0b395c052d 101 }
hank51017 1:6f0b395c052d 102
hank51017 1:6f0b395c052d 103 float BME280::getTemperature()
hank51017 1:6f0b395c052d 104 {
hank51017 3:f0f39d7c1c16 105 int32_t temp_raw;
hank51017 3:f0f39d7c1c16 106 //double tempf;
hank51017 1:6f0b395c052d 107 char cmd[4];
hank51017 1:6f0b395c052d 108
hank51017 1:6f0b395c052d 109 cmd[0] = 0xfa; // temp_msb
hank51017 1:6f0b395c052d 110 i2c.write(address, cmd, 1);
hank51017 1:6f0b395c052d 111 i2c.read(address, &cmd[1], 3);
hank51017 1:6f0b395c052d 112
hank51017 1:6f0b395c052d 113 temp_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
hank51017 3:f0f39d7c1c16 114
hank51017 3:f0f39d7c1c16 115
hank51017 3:f0f39d7c1c16 116 double var1, var2, T;
hank51017 3:f0f39d7c1c16 117
hank51017 3:f0f39d7c1c16 118 var1 = (((double)temp_raw)/16384.0 - ((double)dig_T1)/1024.0) * ((double)dig_T2);
hank51017 3:f0f39d7c1c16 119 var2 = ((((double)temp_raw)/131072.0 - ((double)dig_T1)/8192.0) *
hank51017 3:f0f39d7c1c16 120 (((double)temp_raw)/131072.0 - ((double) dig_T1)/8192.0)) * ((double)dig_T3);
hank51017 3:f0f39d7c1c16 121 t_fine = (uint32_t)(var1 + var2);
hank51017 3:f0f39d7c1c16 122 T = (var1 + var2) / 5120.0;
hank51017 3:f0f39d7c1c16 123 return T;
hank51017 1:6f0b395c052d 124
hank51017 3:f0f39d7c1c16 125 /* int32_t temp; //wrong formula
hank51017 1:6f0b395c052d 126
hank51017 1:6f0b395c052d 127 temp =
hank51017 1:6f0b395c052d 128 (((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11) +
hank51017 3:f0f39d7c1c16 129 ((((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - (int32_t)dig_T1)) >> 12) * (int32_t)dig_T3) >> 14);
hank51017 1:6f0b395c052d 130
hank51017 1:6f0b395c052d 131 t_fine = temp;
hank51017 1:6f0b395c052d 132 temp = (temp * 5 + 128) >> 8;
hank51017 3:f0f39d7c1c16 133 tempf = (double)temp;
hank51017 1:6f0b395c052d 134
hank51017 3:f0f39d7c1c16 135 return (tempf/100.0f);*/
hank51017 1:6f0b395c052d 136 }
hank51017 1:6f0b395c052d 137
hank51017 1:6f0b395c052d 138 float BME280::getPressure()
hank51017 1:6f0b395c052d 139 {
hank51017 3:f0f39d7c1c16 140 int32_t press_raw;
hank51017 3:f0f39d7c1c16 141 //float pressf;
hank51017 1:6f0b395c052d 142 char cmd[4];
hank51017 3:f0f39d7c1c16 143 //int i;
hank51017 1:6f0b395c052d 144
hank51017 1:6f0b395c052d 145 cmd[0] = 0xf7; // press_msb
hank51017 1:6f0b395c052d 146 i2c.write(address, cmd, 1);
hank51017 1:6f0b395c052d 147 i2c.read(address, &cmd[1], 3);
hank51017 2:dcaf0bcf6df6 148
hank51017 1:6f0b395c052d 149
hank51017 1:6f0b395c052d 150 press_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
hank51017 3:f0f39d7c1c16 151 double var1, var2, p;
hank51017 3:f0f39d7c1c16 152
hank51017 3:f0f39d7c1c16 153 var1 = ((double)t_fine/2.0) - 64000.0;
hank51017 3:f0f39d7c1c16 154 var2 = var1 * var1 * ((double)dig_P6) / 32768.0;
hank51017 3:f0f39d7c1c16 155 var2 = var2 + var1 * ((double)dig_P5) * 2.0;
hank51017 3:f0f39d7c1c16 156 var2 = (var2/4.0)+(((double)dig_P4) * 65536.0);
hank51017 3:f0f39d7c1c16 157 var1 = (((double)dig_P3) * var1 * var1 / 524288.0 + ((double)dig_P2) * var1) / 524288.0;
hank51017 3:f0f39d7c1c16 158 var1 = (1.0 + var1 / 32768.0)*((double)dig_P1);
hank51017 3:f0f39d7c1c16 159 if (var1 == 0.0) {
hank51017 3:f0f39d7c1c16 160 return 0; // avoid exception caused by division by zero
hank51017 3:f0f39d7c1c16 161 }
hank51017 3:f0f39d7c1c16 162 p = 1048576.0 - (double)press_raw;
hank51017 3:f0f39d7c1c16 163 p = (p - (var2 / 4096.0)) * 6250.0 / var1;
hank51017 3:f0f39d7c1c16 164 var1 = ((double)dig_P9) * p * p / 2147483648.0;
hank51017 3:f0f39d7c1c16 165 var2 = p * ((double)dig_P8) / 32768.0;
hank51017 3:f0f39d7c1c16 166 p = p + (var1 + var2 + ((double)dig_P7)) / 16.0;
hank51017 3:f0f39d7c1c16 167 return (p/100.0f);
hank51017 1:6f0b395c052d 168
hank51017 3:f0f39d7c1c16 169 /* int32_t var1, var2;
hank51017 1:6f0b395c052d 170 uint32_t press;
hank51017 1:6f0b395c052d 171
hank51017 1:6f0b395c052d 172 var1 = (t_fine >> 1) - 64000;
hank51017 1:6f0b395c052d 173 var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
hank51017 1:6f0b395c052d 174 var2 = var2 + ((var1 * dig_P5) << 1);
hank51017 1:6f0b395c052d 175 var2 = (var2 >> 2) + (dig_P4 << 16);
hank51017 1:6f0b395c052d 176 var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
hank51017 1:6f0b395c052d 177 var1 = ((32768 + var1) * dig_P1) >> 15;
hank51017 1:6f0b395c052d 178 if (var1 == 0) {
hank51017 1:6f0b395c052d 179 return 0;
hank51017 1:6f0b395c052d 180 }
hank51017 1:6f0b395c052d 181 press = (((1048576 - press_raw) - (var2 >> 12))) * 3125;
hank51017 1:6f0b395c052d 182 if(press < 0x80000000) {
hank51017 1:6f0b395c052d 183 press = (press << 1) / var1;
hank51017 1:6f0b395c052d 184 } else {
hank51017 1:6f0b395c052d 185 press = (press / var1) * 2;
hank51017 1:6f0b395c052d 186 }
hank51017 1:6f0b395c052d 187 var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
hank51017 1:6f0b395c052d 188 var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
hank51017 1:6f0b395c052d 189 press = (press + ((var1 + var2 + dig_P7) >> 4));
hank51017 1:6f0b395c052d 190
hank51017 1:6f0b395c052d 191 pressf = (float)press;
hank51017 3:f0f39d7c1c16 192 return (pressf/100.0f);*/
hank51017 1:6f0b395c052d 193 }
hank51017 1:6f0b395c052d 194
hank51017 1:6f0b395c052d 195 float BME280::getHumidity()
hank51017 1:6f0b395c052d 196 {
hank51017 3:f0f39d7c1c16 197 int32_t hum_raw;
hank51017 3:f0f39d7c1c16 198 //float humf;
hank51017 3:f0f39d7c1c16 199 char cmd[4];
hank51017 3:f0f39d7c1c16 200
hank51017 2:dcaf0bcf6df6 201
hank51017 3:f0f39d7c1c16 202
hank51017 2:dcaf0bcf6df6 203
hank51017 1:6f0b395c052d 204 cmd[0] = 0xfd; // hum_msb
hank51017 1:6f0b395c052d 205 i2c.write(address, cmd, 1);
hank51017 3:f0f39d7c1c16 206 i2c.read(address, cmd, 4);
hank51017 2:dcaf0bcf6df6 207
hank51017 2:dcaf0bcf6df6 208
hank51017 2:dcaf0bcf6df6 209
hank51017 3:f0f39d7c1c16 210
hank51017 3:f0f39d7c1c16 211 hum_raw = (cmd[3] << 8) | cmd[2];
hank51017 3:f0f39d7c1c16 212
hank51017 3:f0f39d7c1c16 213
hank51017 3:f0f39d7c1c16 214 double var_H;
hank51017 1:6f0b395c052d 215
hank51017 3:f0f39d7c1c16 216 var_H = (((double)t_fine) - 76800.0);
hank51017 3:f0f39d7c1c16 217 var_H = (hum_raw - (((double)dig_H4) * 64.0 + ((double)dig_H5) / 16384.0 * var_H)) *
hank51017 3:f0f39d7c1c16 218 (((double)dig_H2) / 65536.0 * (1.0 + ((double)dig_H6) / 67108864.0 * var_H *
hank51017 3:f0f39d7c1c16 219 (1.0 + ((double)dig_H3) / 67108864.0 * var_H)));
hank51017 3:f0f39d7c1c16 220 var_H = var_H * (1.0 - ((double)dig_H1) * var_H / 524288.0);
hank51017 3:f0f39d7c1c16 221 if (var_H > 100.0) {
hank51017 3:f0f39d7c1c16 222 var_H = 100.0;
hank51017 3:f0f39d7c1c16 223 } else if (var_H < 0.0) {
hank51017 3:f0f39d7c1c16 224 var_H = 0.0;
hank51017 3:f0f39d7c1c16 225 }
hank51017 3:f0f39d7c1c16 226 return var_H;
hank51017 2:dcaf0bcf6df6 227
hank51017 3:f0f39d7c1c16 228 /* int32_t v_x1;
hank51017 1:6f0b395c052d 229
hank51017 1:6f0b395c052d 230 v_x1 = t_fine - 76800;
hank51017 2:dcaf0bcf6df6 231
hank51017 1:6f0b395c052d 232 v_x1 = (((((hum_raw << 14) -(((int32_t)dig_H4) << 20) - (((int32_t)dig_H5) * v_x1)) +
hank51017 1:6f0b395c052d 233 ((int32_t)16384)) >> 15) * (((((((v_x1 * (int32_t)dig_H6) >> 10) *
hank51017 2:dcaf0bcf6df6 234 (((v_x1 * ((int32_t)dig_H3)) >> 11) + 32768)) >> 10) + (int32_t)2097152) *
hank51017 1:6f0b395c052d 235 (int32_t)dig_H2 + 8192) >> 14));
hank51017 2:dcaf0bcf6df6 236
hank51017 2:dcaf0bcf6df6 237 v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * (int32_t)dig_H1) >> 4));
hank51017 2:dcaf0bcf6df6 238 printf("v_x2 = %d\r\n", v_x1);
hank51017 1:6f0b395c052d 239 v_x1 = (v_x1 < 0 ? 0 : v_x1);
hank51017 2:dcaf0bcf6df6 240 printf("v_x2 = %d\r\n", v_x1);
hank51017 1:6f0b395c052d 241 v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1);
hank51017 2:dcaf0bcf6df6 242
hank51017 2:dcaf0bcf6df6 243
hank51017 2:dcaf0bcf6df6 244
hank51017 2:dcaf0bcf6df6 245 humf = (int32_t)(v_x1 >> 12);
hank51017 1:6f0b395c052d 246
hank51017 3:f0f39d7c1c16 247 return (humf/1024.0f);*/
hank51017 2:dcaf0bcf6df6 248
hank51017 1:6f0b395c052d 249 }