Manuel Caballero / BME280

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BME280.cpp@3:ab857b70346e, 2019-09-03 (annotated)

Committer:
mcm
Date:
Tue Sep 03 15:36:35 2019 +0000
Revision:
3:ab857b70346e
Parent:
2:853301624d95 
Some bugs were fixed in order to adapt the driver to mBed, it is ready for testing.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mcm 2:853301624d95 1 /**
mcm 2:853301624d95 2 * @brief BME280.cpp
mcm 2:853301624d95 3 * @details Combined humidity and pressure sensor.
mcm 2:853301624d95 4 * Function file.
mcm 2:853301624d95 5 *
mcm 2:853301624d95 6 *
mcm 2:853301624d95 7 * @return N/A
mcm 2:853301624d95 8 *
mcm 2:853301624d95 9 * @author Manuel Caballero
mcm 2:853301624d95 10 * @date 03/September/2019
mcm 2:853301624d95 11 * @version 03/September/2019 The ORIGIN
mcm 2:853301624d95 12 * @pre This is just a port from Bosh driver to mBed ( c++ )
mcm 2:853301624d95 13 * @warning N/A
mcm 2:853301624d95 14 * @pre This code belongs to AqueronteBlog ( http://unbarquero.blogspot.com ).
mcm 2:853301624d95 15 */
mcm 2:853301624d95 16 /**\mainpage
mcm 2:853301624d95 17 * Copyright (C) 2018 - 2019 Bosch Sensortec GmbH
mcm 2:853301624d95 18 *
mcm 2:853301624d95 19 * Redistribution and use in source and binary forms, with or without
mcm 2:853301624d95 20 * modification, are permitted provided that the following conditions are met:
mcm 2:853301624d95 21 *
mcm 2:853301624d95 22 * Redistributions of source code must retain the above copyright
mcm 2:853301624d95 23 * notice, this list of conditions and the following disclaimer.
mcm 2:853301624d95 24 *
mcm 2:853301624d95 25 * Redistributions in binary form must reproduce the above copyright
mcm 2:853301624d95 26 * notice, this list of conditions and the following disclaimer in the
mcm 2:853301624d95 27 * documentation and/or other materials provided with the distribution.
mcm 2:853301624d95 28 *
mcm 2:853301624d95 29 * Neither the name of the copyright holder nor the names of the
mcm 2:853301624d95 30 * contributors may be used to endorse or promote products derived from
mcm 2:853301624d95 31 * this software without specific prior written permission.
mcm 2:853301624d95 32 *
mcm 2:853301624d95 33 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
mcm 2:853301624d95 34 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
mcm 2:853301624d95 35 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
mcm 2:853301624d95 36 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mcm 2:853301624d95 37 * DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
mcm 2:853301624d95 38 * OR CONTRIBUTORS BE LIABLE FOR ANY
mcm 2:853301624d95 39 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
mcm 2:853301624d95 40 * OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
mcm 2:853301624d95 41 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
mcm 2:853301624d95 42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
mcm 2:853301624d95 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
mcm 2:853301624d95 44 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
mcm 2:853301624d95 45 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
mcm 2:853301624d95 46 * ANY WAY OUT OF THE USE OF THIS
mcm 2:853301624d95 47 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
mcm 2:853301624d95 48 *
mcm 2:853301624d95 49 * The information provided is believed to be accurate and reliable.
mcm 2:853301624d95 50 * The copyright holder assumes no responsibility
mcm 2:853301624d95 51 * for the consequences of use
mcm 2:853301624d95 52 * of such information nor for any infringement of patents or
mcm 2:853301624d95 53 * other rights of third parties which may result from its use.
mcm 2:853301624d95 54 * No license is granted by implication or otherwise under any patent or
mcm 2:853301624d95 55 * patent rights of the copyright holder.
mcm 2:853301624d95 56 *
mcm 2:853301624d95 57 * File bme280.c
mcm 2:853301624d95 58 * Date 08 Mar 2019
mcm 2:853301624d95 59 * Version 3.3.6
mcm 2:853301624d95 60 *
mcm 2:853301624d95 61 */
mcm 2:853301624d95 62
mcm 2:853301624d95 63 /*! @file bme280.c
mcm 2:853301624d95 64 * @brief Sensor driver for BME280 sensor
mcm 2:853301624d95 65 */
mcm 2:853301624d95 66 #include "BME280.h"
mcm 2:853301624d95 67
mcm 2:853301624d95 68 BME280::BME280 ( PinName sda, PinName scl, uint32_t freq )
mcm 2:853301624d95 69 : _i2c ( sda, scl )
mcm 2:853301624d95 70 {
mcm 2:853301624d95 71 _i2c.frequency ( freq );
mcm 2:853301624d95 72 }
mcm 2:853301624d95 73
mcm 2:853301624d95 74
mcm 2:853301624d95 75 BME280::~BME280()
mcm 2:853301624d95 76 {
mcm 2:853301624d95 77 }
mcm 2:853301624d95 78
mcm 2:853301624d95 79
mcm 2:853301624d95 80 /**\name Internal macros */
mcm 2:853301624d95 81 /* To identify osr settings selected by user */
mcm 2:853301624d95 82 #define OVERSAMPLING_SETTINGS UINT8_C(0x07)
mcm 2:853301624d95 83
mcm 2:853301624d95 84 /* To identify filter and standby settings selected by user */
mcm 2:853301624d95 85 #define FILTER_STANDBY_SETTINGS UINT8_C(0x18)
mcm 2:853301624d95 86
mcm 2:853301624d95 87
mcm 2:853301624d95 88
mcm 2:853301624d95 89 /****************** Global Function Definitions *******************************/
mcm 2:853301624d95 90
mcm 2:853301624d95 91 /*!
mcm 2:853301624d95 92 * @brief This API is the entry point.
mcm 2:853301624d95 93 * It reads the chip-id and calibration data from the sensor.
mcm 2:853301624d95 94 */
mcm 2:853301624d95 95 int8_t BME280::bme280_init(struct bme280_dev *dev)
mcm 2:853301624d95 96 {
mcm 2:853301624d95 97 int8_t rslt;
mcm 2:853301624d95 98
mcm 2:853301624d95 99 /* chip id read try count */
mcm 2:853301624d95 100 uint8_t try_count = 5;
mcm 2:853301624d95 101 uint8_t chip_id = 0;
mcm 2:853301624d95 102
mcm 2:853301624d95 103 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 104 rslt = null_ptr_check(dev);
mcm 2:853301624d95 105
mcm 2:853301624d95 106 /* Proceed if null check is fine */
mcm 2:853301624d95 107 if (rslt == BME280_OK) {
mcm 2:853301624d95 108 while (try_count) {
mcm 2:853301624d95 109 /* Read the chip-id of bme280 sensor */
mcm 2:853301624d95 110 rslt = bme280_get_regs(BME280_CHIP_ID_ADDR, &chip_id, 1, dev);
mcm 2:853301624d95 111
mcm 2:853301624d95 112 /* Check for chip id validity */
mcm 2:853301624d95 113 if ((rslt == BME280_OK) && (chip_id == BME280_CHIP_ID)) {
mcm 2:853301624d95 114 dev->chip_id = chip_id;
mcm 2:853301624d95 115
mcm 2:853301624d95 116 /* Reset the sensor */
mcm 2:853301624d95 117 rslt = bme280_soft_reset(dev);
mcm 2:853301624d95 118 if (rslt == BME280_OK) {
mcm 2:853301624d95 119 /* Read the calibration data */
mcm 2:853301624d95 120 rslt = get_calib_data(dev);
mcm 2:853301624d95 121 }
mcm 2:853301624d95 122 break;
mcm 2:853301624d95 123 }
mcm 2:853301624d95 124
mcm 2:853301624d95 125 /* Wait for 1 ms */
mcm 2:853301624d95 126 dev->delay_ms(1);
mcm 2:853301624d95 127 --try_count;
mcm 2:853301624d95 128 }
mcm 2:853301624d95 129
mcm 2:853301624d95 130 /* Chip id check failed */
mcm 2:853301624d95 131 if (!try_count) {
mcm 2:853301624d95 132 rslt = BME280_E_DEV_NOT_FOUND;
mcm 2:853301624d95 133 }
mcm 2:853301624d95 134 }
mcm 2:853301624d95 135
mcm 2:853301624d95 136 return rslt;
mcm 2:853301624d95 137 }
mcm 2:853301624d95 138
mcm 2:853301624d95 139 /*!
mcm 2:853301624d95 140 * @brief This API reads the data from the given register address of the sensor.
mcm 2:853301624d95 141 */
mcm 2:853301624d95 142 int8_t BME280::bme280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, const struct bme280_dev *dev)
mcm 2:853301624d95 143 {
mcm 2:853301624d95 144 int8_t rslt;
mcm 2:853301624d95 145
mcm 2:853301624d95 146 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 147 rslt = null_ptr_check(dev);
mcm 2:853301624d95 148
mcm 2:853301624d95 149 /* Proceed if null check is fine */
mcm 2:853301624d95 150 if (rslt == BME280_OK) {
mcm 2:853301624d95 151 /* If interface selected is SPI */
mcm 2:853301624d95 152 if (dev->intf != BME280_I2C_INTF) {
mcm 2:853301624d95 153 reg_addr = reg_addr | 0x80;
mcm 2:853301624d95 154 }
mcm 2:853301624d95 155
mcm 2:853301624d95 156 /* Read the data */
mcm 2:853301624d95 157 rslt = dev->read(dev->dev_id, reg_addr, reg_data, len);
mcm 2:853301624d95 158
mcm 2:853301624d95 159 /* Check for communication error */
mcm 2:853301624d95 160 if (rslt != BME280_OK) {
mcm 2:853301624d95 161 rslt = BME280_E_COMM_FAIL;
mcm 2:853301624d95 162 }
mcm 2:853301624d95 163 }
mcm 2:853301624d95 164
mcm 2:853301624d95 165 return rslt;
mcm 2:853301624d95 166 }
mcm 2:853301624d95 167
mcm 2:853301624d95 168 /*!
mcm 2:853301624d95 169 * @brief This API writes the given data to the register address
mcm 2:853301624d95 170 * of the sensor.
mcm 2:853301624d95 171 */
mcm 2:853301624d95 172 int8_t BME280::bme280_set_regs(uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, const struct bme280_dev *dev)
mcm 2:853301624d95 173 {
mcm 2:853301624d95 174 int8_t rslt;
mcm 2:853301624d95 175 uint8_t temp_buff[20]; /* Typically not to write more than 10 registers */
mcm 2:853301624d95 176
mcm 2:853301624d95 177 if (len > 10) {
mcm 2:853301624d95 178 len = 10;
mcm 2:853301624d95 179 }
mcm 2:853301624d95 180 uint16_t temp_len;
mcm 2:853301624d95 181 uint8_t reg_addr_cnt;
mcm 2:853301624d95 182
mcm 2:853301624d95 183 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 184 rslt = null_ptr_check(dev);
mcm 2:853301624d95 185
mcm 2:853301624d95 186 /* Check for arguments validity */
mcm 2:853301624d95 187 if ((rslt == BME280_OK) && (reg_addr != NULL) && (reg_data != NULL)) {
mcm 2:853301624d95 188 if (len != 0) {
mcm 2:853301624d95 189 temp_buff[0] = reg_data[0];
mcm 2:853301624d95 190
mcm 2:853301624d95 191 /* If interface selected is SPI */
mcm 2:853301624d95 192 if (dev->intf != BME280_I2C_INTF) {
mcm 2:853301624d95 193 for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++) {
mcm 2:853301624d95 194 reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
mcm 2:853301624d95 195 }
mcm 2:853301624d95 196 }
mcm 2:853301624d95 197
mcm 2:853301624d95 198 /* Burst write mode */
mcm 2:853301624d95 199 if (len > 1) {
mcm 2:853301624d95 200 /* Interleave register address w.r.t data for
mcm 2:853301624d95 201 * burst write
mcm 2:853301624d95 202 */
mcm 2:853301624d95 203 interleave_reg_addr(reg_addr, temp_buff, reg_data, len);
mcm 2:853301624d95 204 temp_len = ((len * 2) - 1);
mcm 2:853301624d95 205 } else {
mcm 2:853301624d95 206 temp_len = len;
mcm 2:853301624d95 207 }
mcm 2:853301624d95 208 rslt = dev->write(dev->dev_id, reg_addr[0], temp_buff, temp_len);
mcm 2:853301624d95 209
mcm 2:853301624d95 210 /* Check for communication error */
mcm 2:853301624d95 211 if (rslt != BME280_OK) {
mcm 2:853301624d95 212 rslt = BME280_E_COMM_FAIL;
mcm 2:853301624d95 213 }
mcm 2:853301624d95 214 } else {
mcm 2:853301624d95 215 rslt = BME280_E_INVALID_LEN;
mcm 2:853301624d95 216 }
mcm 2:853301624d95 217 } else {
mcm 2:853301624d95 218 rslt = BME280_E_NULL_PTR;
mcm 2:853301624d95 219 }
mcm 2:853301624d95 220
mcm 2:853301624d95 221 return rslt;
mcm 2:853301624d95 222 }
mcm 2:853301624d95 223
mcm 2:853301624d95 224 /*!
mcm 2:853301624d95 225 * @brief This API sets the oversampling, filter and standby duration
mcm 2:853301624d95 226 * (normal mode) settings in the sensor.
mcm 2:853301624d95 227 */
mcm 2:853301624d95 228 int8_t BME280::bme280_set_sensor_settings(uint8_t desired_settings, const struct bme280_dev *dev)
mcm 2:853301624d95 229 {
mcm 2:853301624d95 230 int8_t rslt;
mcm 2:853301624d95 231 uint8_t sensor_mode;
mcm 2:853301624d95 232
mcm 2:853301624d95 233 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 234 rslt = null_ptr_check(dev);
mcm 2:853301624d95 235
mcm 2:853301624d95 236 /* Proceed if null check is fine */
mcm 2:853301624d95 237 if (rslt == BME280_OK) {
mcm 2:853301624d95 238 rslt = bme280_get_sensor_mode(&sensor_mode, dev);
mcm 2:853301624d95 239 if ((rslt == BME280_OK) && (sensor_mode != BME280_SLEEP_MODE)) {
mcm 2:853301624d95 240 rslt = put_device_to_sleep(dev);
mcm 2:853301624d95 241 }
mcm 2:853301624d95 242 if (rslt == BME280_OK) {
mcm 2:853301624d95 243 /* Check if user wants to change oversampling
mcm 2:853301624d95 244 * settings
mcm 2:853301624d95 245 */
mcm 2:853301624d95 246 if (are_settings_changed(OVERSAMPLING_SETTINGS, desired_settings)) {
mcm 2:853301624d95 247 rslt = set_osr_settings(desired_settings, &dev->settings, dev);
mcm 2:853301624d95 248 }
mcm 2:853301624d95 249
mcm 2:853301624d95 250 /* Check if user wants to change filter and/or
mcm 2:853301624d95 251 * standby settings
mcm 2:853301624d95 252 */
mcm 2:853301624d95 253 if ((rslt == BME280_OK) && are_settings_changed(FILTER_STANDBY_SETTINGS, desired_settings)) {
mcm 2:853301624d95 254 rslt = set_filter_standby_settings(desired_settings, &dev->settings, dev);
mcm 2:853301624d95 255 }
mcm 2:853301624d95 256 }
mcm 2:853301624d95 257 }
mcm 2:853301624d95 258
mcm 2:853301624d95 259 return rslt;
mcm 2:853301624d95 260 }
mcm 2:853301624d95 261
mcm 2:853301624d95 262 /*!
mcm 2:853301624d95 263 * @brief This API gets the oversampling, filter and standby duration
mcm 2:853301624d95 264 * (normal mode) settings from the sensor.
mcm 2:853301624d95 265 */
mcm 2:853301624d95 266 int8_t BME280::bme280_get_sensor_settings(struct bme280_dev *dev)
mcm 2:853301624d95 267 {
mcm 2:853301624d95 268 int8_t rslt;
mcm 2:853301624d95 269 uint8_t reg_data[4];
mcm 2:853301624d95 270
mcm 2:853301624d95 271 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 272 rslt = null_ptr_check(dev);
mcm 2:853301624d95 273
mcm 2:853301624d95 274 /* Proceed if null check is fine */
mcm 2:853301624d95 275 if (rslt == BME280_OK) {
mcm 2:853301624d95 276 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
mcm 2:853301624d95 277 if (rslt == BME280_OK) {
mcm 2:853301624d95 278 parse_device_settings(reg_data, &dev->settings);
mcm 2:853301624d95 279 }
mcm 2:853301624d95 280 }
mcm 2:853301624d95 281
mcm 2:853301624d95 282 return rslt;
mcm 2:853301624d95 283 }
mcm 2:853301624d95 284
mcm 2:853301624d95 285 /*!
mcm 2:853301624d95 286 * @brief This API sets the power mode of the sensor.
mcm 2:853301624d95 287 */
mcm 2:853301624d95 288 int8_t BME280::bme280_set_sensor_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
mcm 2:853301624d95 289 {
mcm 2:853301624d95 290 int8_t rslt;
mcm 2:853301624d95 291 uint8_t last_set_mode;
mcm 2:853301624d95 292
mcm 2:853301624d95 293 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 294 rslt = null_ptr_check(dev);
mcm 2:853301624d95 295 if (rslt == BME280_OK) {
mcm 2:853301624d95 296 rslt = bme280_get_sensor_mode(&last_set_mode, dev);
mcm 2:853301624d95 297
mcm 2:853301624d95 298 /* If the sensor is not in sleep mode put the device to sleep
mcm 2:853301624d95 299 * mode
mcm 2:853301624d95 300 */
mcm 2:853301624d95 301 if ((rslt == BME280_OK) && (last_set_mode != BME280_SLEEP_MODE)) {
mcm 2:853301624d95 302 rslt = put_device_to_sleep(dev);
mcm 2:853301624d95 303 }
mcm 2:853301624d95 304
mcm 2:853301624d95 305 /* Set the power mode */
mcm 2:853301624d95 306 if (rslt == BME280_OK) {
mcm 2:853301624d95 307 rslt = write_power_mode(sensor_mode, dev);
mcm 2:853301624d95 308 }
mcm 2:853301624d95 309 }
mcm 2:853301624d95 310
mcm 2:853301624d95 311 return rslt;
mcm 2:853301624d95 312 }
mcm 2:853301624d95 313
mcm 2:853301624d95 314 /*!
mcm 2:853301624d95 315 * @brief This API gets the power mode of the sensor.
mcm 2:853301624d95 316 */
mcm 2:853301624d95 317 int8_t BME280::bme280_get_sensor_mode(uint8_t *sensor_mode, const struct bme280_dev *dev)
mcm 2:853301624d95 318 {
mcm 2:853301624d95 319 int8_t rslt;
mcm 2:853301624d95 320
mcm 2:853301624d95 321 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 322 rslt = null_ptr_check(dev);
mcm 2:853301624d95 323 if (rslt == BME280_OK) {
mcm 2:853301624d95 324 /* Read the power mode register */
mcm 2:853301624d95 325 rslt = bme280_get_regs(BME280_PWR_CTRL_ADDR, sensor_mode, 1, dev);
mcm 2:853301624d95 326
mcm 2:853301624d95 327 /* Assign the power mode in the device structure */
mcm 2:853301624d95 328 *sensor_mode = BME280_GET_BITS_POS_0(*sensor_mode, BME280_SENSOR_MODE);
mcm 2:853301624d95 329 }
mcm 2:853301624d95 330
mcm 2:853301624d95 331 return rslt;
mcm 2:853301624d95 332 }
mcm 2:853301624d95 333
mcm 2:853301624d95 334 /*!
mcm 2:853301624d95 335 * @brief This API performs the soft reset of the sensor.
mcm 2:853301624d95 336 */
mcm 2:853301624d95 337 int8_t BME280::bme280_soft_reset(const struct bme280_dev *dev)
mcm 2:853301624d95 338 {
mcm 2:853301624d95 339 int8_t rslt;
mcm 2:853301624d95 340 uint8_t reg_addr = BME280_RESET_ADDR;
mcm 2:853301624d95 341
mcm 2:853301624d95 342 /* 0xB6 is the soft reset command */
mcm 2:853301624d95 343 uint8_t soft_rst_cmd = 0xB6;
mcm 2:853301624d95 344
mcm 2:853301624d95 345 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 346 rslt = null_ptr_check(dev);
mcm 2:853301624d95 347
mcm 2:853301624d95 348 /* Proceed if null check is fine */
mcm 2:853301624d95 349 if (rslt == BME280_OK) {
mcm 2:853301624d95 350 /* Write the soft reset command in the sensor */
mcm 2:853301624d95 351 rslt = bme280_set_regs(&reg_addr, &soft_rst_cmd, 1, dev);
mcm 2:853301624d95 352
mcm 2:853301624d95 353 /* As per data sheet, startup time is 2 ms. */
mcm 2:853301624d95 354 dev->delay_ms(2);
mcm 2:853301624d95 355 }
mcm 2:853301624d95 356
mcm 2:853301624d95 357 return rslt;
mcm 2:853301624d95 358 }
mcm 2:853301624d95 359
mcm 2:853301624d95 360 /*!
mcm 2:853301624d95 361 * @brief This API reads the pressure, temperature and humidity data from the
mcm 2:853301624d95 362 * sensor, compensates the data and store it in the bme280_data structure
mcm 2:853301624d95 363 * instance passed by the user.
mcm 2:853301624d95 364 */
mcm 2:853301624d95 365 int8_t BME280::bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev)
mcm 2:853301624d95 366 {
mcm 2:853301624d95 367 int8_t rslt;
mcm 2:853301624d95 368
mcm 2:853301624d95 369 /* Array to store the pressure, temperature and humidity data read from
mcm 2:853301624d95 370 * the sensor
mcm 2:853301624d95 371 */
mcm 2:853301624d95 372 uint8_t reg_data[BME280_P_T_H_DATA_LEN] = { 0 };
mcm 2:853301624d95 373 struct bme280_uncomp_data uncomp_data = { 0 };
mcm 2:853301624d95 374
mcm 2:853301624d95 375 /* Check for null pointer in the device structure*/
mcm 2:853301624d95 376 rslt = null_ptr_check(dev);
mcm 2:853301624d95 377 if ((rslt == BME280_OK) && (comp_data != NULL)) {
mcm 2:853301624d95 378 /* Read the pressure and temperature data from the sensor */
mcm 2:853301624d95 379 rslt = bme280_get_regs(BME280_DATA_ADDR, reg_data, BME280_P_T_H_DATA_LEN, dev);
mcm 2:853301624d95 380 if (rslt == BME280_OK) {
mcm 2:853301624d95 381 /* Parse the read data from the sensor */
mcm 2:853301624d95 382 bme280_parse_sensor_data(reg_data, &uncomp_data);
mcm 2:853301624d95 383
mcm 2:853301624d95 384 /* Compensate the pressure and/or temperature and/or
mcm 2:853301624d95 385 * humidity data from the sensor
mcm 2:853301624d95 386 */
mcm 2:853301624d95 387 rslt = bme280_compensate_data(sensor_comp, &uncomp_data, comp_data, &dev->calib_data);
mcm 2:853301624d95 388 }
mcm 2:853301624d95 389 } else {
mcm 2:853301624d95 390 rslt = BME280_E_NULL_PTR;
mcm 2:853301624d95 391 }
mcm 2:853301624d95 392
mcm 2:853301624d95 393 return rslt;
mcm 2:853301624d95 394 }
mcm 2:853301624d95 395
mcm 2:853301624d95 396 /*!
mcm 2:853301624d95 397 * @brief This API is used to parse the pressure, temperature and
mcm 2:853301624d95 398 * humidity data and store it in the bme280_uncomp_data structure instance.
mcm 2:853301624d95 399 */
mcm 2:853301624d95 400 void BME280::bme280_parse_sensor_data(const uint8_t *reg_data, struct bme280_uncomp_data *uncomp_data)
mcm 2:853301624d95 401 {
mcm 2:853301624d95 402 /* Variables to store the sensor data */
mcm 2:853301624d95 403 uint32_t data_xlsb;
mcm 2:853301624d95 404 uint32_t data_lsb;
mcm 2:853301624d95 405 uint32_t data_msb;
mcm 2:853301624d95 406
mcm 2:853301624d95 407 /* Store the parsed register values for pressure data */
mcm 2:853301624d95 408 data_msb = (uint32_t)reg_data[0] << 12;
mcm 2:853301624d95 409 data_lsb = (uint32_t)reg_data[1] << 4;
mcm 2:853301624d95 410 data_xlsb = (uint32_t)reg_data[2] >> 4;
mcm 2:853301624d95 411 uncomp_data->pressure = data_msb | data_lsb | data_xlsb;
mcm 2:853301624d95 412
mcm 2:853301624d95 413 /* Store the parsed register values for temperature data */
mcm 2:853301624d95 414 data_msb = (uint32_t)reg_data[3] << 12;
mcm 2:853301624d95 415 data_lsb = (uint32_t)reg_data[4] << 4;
mcm 2:853301624d95 416 data_xlsb = (uint32_t)reg_data[5] >> 4;
mcm 2:853301624d95 417 uncomp_data->temperature = data_msb | data_lsb | data_xlsb;
mcm 2:853301624d95 418
mcm 2:853301624d95 419 /* Store the parsed register values for temperature data */
mcm 2:853301624d95 420 data_lsb = (uint32_t)reg_data[6] << 8;
mcm 2:853301624d95 421 data_msb = (uint32_t)reg_data[7];
mcm 2:853301624d95 422 uncomp_data->humidity = data_msb | data_lsb;
mcm 2:853301624d95 423 }
mcm 2:853301624d95 424
mcm 2:853301624d95 425 /*!
mcm 2:853301624d95 426 * @brief This API is used to compensate the pressure and/or
mcm 2:853301624d95 427 * temperature and/or humidity data according to the component selected
mcm 2:853301624d95 428 * by the user.
mcm 2:853301624d95 429 */
mcm 2:853301624d95 430 int8_t BME280::bme280_compensate_data(uint8_t sensor_comp,
mcm 2:853301624d95 431 const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 432 struct bme280_data *comp_data,
mcm 2:853301624d95 433 struct bme280_calib_data *calib_data)
mcm 2:853301624d95 434 {
mcm 2:853301624d95 435 int8_t rslt = BME280_OK;
mcm 2:853301624d95 436
mcm 2:853301624d95 437 if ((uncomp_data != NULL) && (comp_data != NULL) && (calib_data != NULL)) {
mcm 2:853301624d95 438 /* Initialize to zero */
mcm 2:853301624d95 439 comp_data->temperature = 0;
mcm 2:853301624d95 440 comp_data->pressure = 0;
mcm 2:853301624d95 441 comp_data->humidity = 0;
mcm 2:853301624d95 442
mcm 2:853301624d95 443 /* If pressure or temperature component is selected */
mcm 2:853301624d95 444 if (sensor_comp & (BME280_PRESS | BME280_TEMP | BME280_HUM)) {
mcm 2:853301624d95 445 /* Compensate the temperature data */
mcm 2:853301624d95 446 comp_data->temperature = compensate_temperature(uncomp_data, calib_data);
mcm 2:853301624d95 447 }
mcm 2:853301624d95 448 if (sensor_comp & BME280_PRESS) {
mcm 2:853301624d95 449 /* Compensate the pressure data */
mcm 2:853301624d95 450 comp_data->pressure = compensate_pressure(uncomp_data, calib_data);
mcm 2:853301624d95 451 }
mcm 2:853301624d95 452 if (sensor_comp & BME280_HUM) {
mcm 2:853301624d95 453 /* Compensate the humidity data */
mcm 2:853301624d95 454 comp_data->humidity = compensate_humidity(uncomp_data, calib_data);
mcm 2:853301624d95 455 }
mcm 2:853301624d95 456 } else {
mcm 2:853301624d95 457 rslt = BME280_E_NULL_PTR;
mcm 2:853301624d95 458 }
mcm 2:853301624d95 459
mcm 2:853301624d95 460 return rslt;
mcm 2:853301624d95 461 }
mcm 2:853301624d95 462
mcm 2:853301624d95 463 /*!
mcm 2:853301624d95 464 * @brief This internal API sets the oversampling settings for pressure,
mcm 2:853301624d95 465 * temperature and humidity in the sensor.
mcm 2:853301624d95 466 */
mcm 3:ab857b70346e 467 int8_t BME280::set_osr_settings(uint8_t desired_settings,
mcm 2:853301624d95 468 const struct bme280_settings *settings,
mcm 2:853301624d95 469 const struct bme280_dev *dev)
mcm 2:853301624d95 470 {
mcm 2:853301624d95 471 int8_t rslt = BME280_W_INVALID_OSR_MACRO;
mcm 2:853301624d95 472
mcm 2:853301624d95 473 if (desired_settings & BME280_OSR_HUM_SEL) {
mcm 2:853301624d95 474 rslt = set_osr_humidity_settings(settings, dev);
mcm 2:853301624d95 475 }
mcm 2:853301624d95 476 if (desired_settings & (BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL)) {
mcm 2:853301624d95 477 rslt = set_osr_press_temp_settings(desired_settings, settings, dev);
mcm 2:853301624d95 478 }
mcm 2:853301624d95 479
mcm 2:853301624d95 480 return rslt;
mcm 2:853301624d95 481 }
mcm 2:853301624d95 482
mcm 2:853301624d95 483 /*!
mcm 2:853301624d95 484 * @brief This API sets the humidity oversampling settings of the sensor.
mcm 2:853301624d95 485 */
mcm 3:ab857b70346e 486 int8_t BME280::set_osr_humidity_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
mcm 2:853301624d95 487 {
mcm 2:853301624d95 488 int8_t rslt;
mcm 2:853301624d95 489 uint8_t ctrl_hum;
mcm 2:853301624d95 490 uint8_t ctrl_meas;
mcm 2:853301624d95 491 uint8_t reg_addr = BME280_CTRL_HUM_ADDR;
mcm 2:853301624d95 492
mcm 2:853301624d95 493 ctrl_hum = settings->osr_h & BME280_CTRL_HUM_MSK;
mcm 2:853301624d95 494
mcm 2:853301624d95 495 /* Write the humidity control value in the register */
mcm 2:853301624d95 496 rslt = bme280_set_regs(&reg_addr, &ctrl_hum, 1, dev);
mcm 2:853301624d95 497
mcm 2:853301624d95 498 /* Humidity related changes will be only effective after a
mcm 2:853301624d95 499 * write operation to ctrl_meas register
mcm 2:853301624d95 500 */
mcm 2:853301624d95 501 if (rslt == BME280_OK) {
mcm 2:853301624d95 502 reg_addr = BME280_CTRL_MEAS_ADDR;
mcm 2:853301624d95 503 rslt = bme280_get_regs(reg_addr, &ctrl_meas, 1, dev);
mcm 2:853301624d95 504 if (rslt == BME280_OK) {
mcm 2:853301624d95 505 rslt = bme280_set_regs(&reg_addr, &ctrl_meas, 1, dev);
mcm 2:853301624d95 506 }
mcm 2:853301624d95 507 }
mcm 2:853301624d95 508
mcm 2:853301624d95 509 return rslt;
mcm 2:853301624d95 510 }
mcm 2:853301624d95 511
mcm 2:853301624d95 512 /*!
mcm 2:853301624d95 513 * @brief This API sets the pressure and/or temperature oversampling settings
mcm 2:853301624d95 514 * in the sensor according to the settings selected by the user.
mcm 2:853301624d95 515 */
mcm 3:ab857b70346e 516 int8_t BME280::set_osr_press_temp_settings(uint8_t desired_settings,
mcm 2:853301624d95 517 const struct bme280_settings *settings,
mcm 2:853301624d95 518 const struct bme280_dev *dev)
mcm 2:853301624d95 519 {
mcm 2:853301624d95 520 int8_t rslt;
mcm 2:853301624d95 521 uint8_t reg_addr = BME280_CTRL_MEAS_ADDR;
mcm 2:853301624d95 522 uint8_t reg_data;
mcm 2:853301624d95 523
mcm 2:853301624d95 524 rslt = bme280_get_regs(reg_addr, &reg_data, 1, dev);
mcm 2:853301624d95 525 if (rslt == BME280_OK) {
mcm 2:853301624d95 526 if (desired_settings & BME280_OSR_PRESS_SEL) {
mcm 2:853301624d95 527 fill_osr_press_settings(&reg_data, settings);
mcm 2:853301624d95 528 }
mcm 2:853301624d95 529 if (desired_settings & BME280_OSR_TEMP_SEL) {
mcm 2:853301624d95 530 fill_osr_temp_settings(&reg_data, settings);
mcm 2:853301624d95 531 }
mcm 2:853301624d95 532
mcm 2:853301624d95 533 /* Write the oversampling settings in the register */
mcm 2:853301624d95 534 rslt = bme280_set_regs(&reg_addr, &reg_data, 1, dev);
mcm 2:853301624d95 535 }
mcm 2:853301624d95 536
mcm 2:853301624d95 537 return rslt;
mcm 2:853301624d95 538 }
mcm 2:853301624d95 539
mcm 2:853301624d95 540 /*!
mcm 2:853301624d95 541 * @brief This internal API sets the filter and/or standby duration settings
mcm 2:853301624d95 542 * in the sensor according to the settings selected by the user.
mcm 2:853301624d95 543 */
mcm 3:ab857b70346e 544 int8_t BME280::set_filter_standby_settings(uint8_t desired_settings,
mcm 2:853301624d95 545 const struct bme280_settings *settings,
mcm 2:853301624d95 546 const struct bme280_dev *dev)
mcm 2:853301624d95 547 {
mcm 2:853301624d95 548 int8_t rslt;
mcm 2:853301624d95 549 uint8_t reg_addr = BME280_CONFIG_ADDR;
mcm 2:853301624d95 550 uint8_t reg_data;
mcm 2:853301624d95 551
mcm 2:853301624d95 552 rslt = bme280_get_regs(reg_addr, &reg_data, 1, dev);
mcm 2:853301624d95 553 if (rslt == BME280_OK) {
mcm 2:853301624d95 554 if (desired_settings & BME280_FILTER_SEL) {
mcm 2:853301624d95 555 fill_filter_settings(&reg_data, settings);
mcm 2:853301624d95 556 }
mcm 2:853301624d95 557 if (desired_settings & BME280_STANDBY_SEL) {
mcm 2:853301624d95 558 fill_standby_settings(&reg_data, settings);
mcm 2:853301624d95 559 }
mcm 2:853301624d95 560
mcm 2:853301624d95 561 /* Write the oversampling settings in the register */
mcm 2:853301624d95 562 rslt = bme280_set_regs(&reg_addr, &reg_data, 1, dev);
mcm 2:853301624d95 563 }
mcm 2:853301624d95 564
mcm 2:853301624d95 565 return rslt;
mcm 2:853301624d95 566 }
mcm 2:853301624d95 567
mcm 2:853301624d95 568 /*!
mcm 2:853301624d95 569 * @brief This internal API fills the filter settings provided by the user
mcm 2:853301624d95 570 * in the data buffer so as to write in the sensor.
mcm 2:853301624d95 571 */
mcm 3:ab857b70346e 572 void BME280::fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings)
mcm 2:853301624d95 573 {
mcm 2:853301624d95 574 *reg_data = BME280_SET_BITS(*reg_data, BME280_FILTER, settings->filter);
mcm 2:853301624d95 575 }
mcm 2:853301624d95 576
mcm 2:853301624d95 577 /*!
mcm 2:853301624d95 578 * @brief This internal API fills the standby duration settings provided by
mcm 2:853301624d95 579 * the user in the data buffer so as to write in the sensor.
mcm 2:853301624d95 580 */
mcm 3:ab857b70346e 581 void BME280::fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings)
mcm 2:853301624d95 582 {
mcm 2:853301624d95 583 *reg_data = BME280_SET_BITS(*reg_data, BME280_STANDBY, settings->standby_time);
mcm 2:853301624d95 584 }
mcm 2:853301624d95 585
mcm 2:853301624d95 586 /*!
mcm 2:853301624d95 587 * @brief This internal API fills the pressure oversampling settings provided by
mcm 2:853301624d95 588 * the user in the data buffer so as to write in the sensor.
mcm 2:853301624d95 589 */
mcm 3:ab857b70346e 590 void BME280::fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings)
mcm 2:853301624d95 591 {
mcm 2:853301624d95 592 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_PRESS, settings->osr_p);
mcm 2:853301624d95 593 }
mcm 2:853301624d95 594
mcm 2:853301624d95 595 /*!
mcm 2:853301624d95 596 * @brief This internal API fills the temperature oversampling settings
mcm 2:853301624d95 597 * provided by the user in the data buffer so as to write in the sensor.
mcm 2:853301624d95 598 */
mcm 3:ab857b70346e 599 void BME280::fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings)
mcm 2:853301624d95 600 {
mcm 2:853301624d95 601 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_TEMP, settings->osr_t);
mcm 2:853301624d95 602 }
mcm 2:853301624d95 603
mcm 2:853301624d95 604 /*!
mcm 2:853301624d95 605 * @brief This internal API parse the oversampling(pressure, temperature
mcm 2:853301624d95 606 * and humidity), filter and standby duration settings and store in the
mcm 2:853301624d95 607 * device structure.
mcm 2:853301624d95 608 */
mcm 3:ab857b70346e 609 void BME280::parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings)
mcm 2:853301624d95 610 {
mcm 2:853301624d95 611 settings->osr_h = BME280_GET_BITS_POS_0(reg_data[0], BME280_CTRL_HUM);
mcm 2:853301624d95 612 settings->osr_p = BME280_GET_BITS(reg_data[2], BME280_CTRL_PRESS);
mcm 2:853301624d95 613 settings->osr_t = BME280_GET_BITS(reg_data[2], BME280_CTRL_TEMP);
mcm 2:853301624d95 614 settings->filter = BME280_GET_BITS(reg_data[3], BME280_FILTER);
mcm 2:853301624d95 615 settings->standby_time = BME280_GET_BITS(reg_data[3], BME280_STANDBY);
mcm 2:853301624d95 616 }
mcm 2:853301624d95 617
mcm 2:853301624d95 618 /*!
mcm 2:853301624d95 619 * @brief This internal API writes the power mode in the sensor.
mcm 2:853301624d95 620 */
mcm 3:ab857b70346e 621 int8_t BME280::write_power_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
mcm 2:853301624d95 622 {
mcm 2:853301624d95 623 int8_t rslt;
mcm 2:853301624d95 624 uint8_t reg_addr = BME280_PWR_CTRL_ADDR;
mcm 2:853301624d95 625
mcm 2:853301624d95 626 /* Variable to store the value read from power mode register */
mcm 2:853301624d95 627 uint8_t sensor_mode_reg_val;
mcm 2:853301624d95 628
mcm 2:853301624d95 629 /* Read the power mode register */
mcm 2:853301624d95 630 rslt = bme280_get_regs(reg_addr, &sensor_mode_reg_val, 1, dev);
mcm 2:853301624d95 631
mcm 2:853301624d95 632 /* Set the power mode */
mcm 2:853301624d95 633 if (rslt == BME280_OK) {
mcm 2:853301624d95 634 sensor_mode_reg_val = BME280_SET_BITS_POS_0(sensor_mode_reg_val, BME280_SENSOR_MODE, sensor_mode);
mcm 2:853301624d95 635
mcm 2:853301624d95 636 /* Write the power mode in the register */
mcm 2:853301624d95 637 rslt = bme280_set_regs(&reg_addr, &sensor_mode_reg_val, 1, dev);
mcm 2:853301624d95 638 }
mcm 2:853301624d95 639
mcm 2:853301624d95 640 return rslt;
mcm 2:853301624d95 641 }
mcm 2:853301624d95 642
mcm 2:853301624d95 643 /*!
mcm 2:853301624d95 644 * @brief This internal API puts the device to sleep mode.
mcm 2:853301624d95 645 */
mcm 3:ab857b70346e 646 int8_t BME280::put_device_to_sleep(const struct bme280_dev *dev)
mcm 2:853301624d95 647 {
mcm 2:853301624d95 648 int8_t rslt;
mcm 2:853301624d95 649 uint8_t reg_data[4];
mcm 2:853301624d95 650 struct bme280_settings settings;
mcm 2:853301624d95 651
mcm 2:853301624d95 652 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
mcm 2:853301624d95 653 if (rslt == BME280_OK) {
mcm 2:853301624d95 654 parse_device_settings(reg_data, &settings);
mcm 2:853301624d95 655 rslt = bme280_soft_reset(dev);
mcm 2:853301624d95 656 if (rslt == BME280_OK) {
mcm 2:853301624d95 657 rslt = reload_device_settings(&settings, dev);
mcm 2:853301624d95 658 }
mcm 2:853301624d95 659 }
mcm 2:853301624d95 660
mcm 2:853301624d95 661 return rslt;
mcm 2:853301624d95 662 }
mcm 2:853301624d95 663
mcm 2:853301624d95 664 /*!
mcm 2:853301624d95 665 * @brief This internal API reloads the already existing device settings in
mcm 2:853301624d95 666 * the sensor after soft reset.
mcm 2:853301624d95 667 */
mcm 3:ab857b70346e 668 int8_t BME280::reload_device_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
mcm 2:853301624d95 669 {
mcm 2:853301624d95 670 int8_t rslt;
mcm 2:853301624d95 671
mcm 2:853301624d95 672 rslt = set_osr_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
mcm 2:853301624d95 673 if (rslt == BME280_OK) {
mcm 2:853301624d95 674 rslt = set_filter_standby_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
mcm 2:853301624d95 675 }
mcm 2:853301624d95 676
mcm 2:853301624d95 677 return rslt;
mcm 2:853301624d95 678 }
mcm 2:853301624d95 679
mcm 2:853301624d95 680 #ifdef BME280_FLOAT_ENABLE
mcm 2:853301624d95 681
mcm 2:853301624d95 682 /*!
mcm 2:853301624d95 683 * @brief This internal API is used to compensate the raw temperature data and
mcm 2:853301624d95 684 * return the compensated temperature data in double data type.
mcm 2:853301624d95 685 */
mcm 3:ab857b70346e 686 double BME280::compensate_temperature(const struct bme280_uncomp_data *uncomp_data, struct bme280_calib_data *calib_data)
mcm 2:853301624d95 687 {
mcm 2:853301624d95 688 double var1;
mcm 2:853301624d95 689 double var2;
mcm 2:853301624d95 690 double temperature;
mcm 2:853301624d95 691 double temperature_min = -40;
mcm 2:853301624d95 692 double temperature_max = 85;
mcm 2:853301624d95 693
mcm 2:853301624d95 694 var1 = ((double)uncomp_data->temperature) / 16384.0 - ((double)calib_data->dig_T1) / 1024.0;
mcm 2:853301624d95 695 var1 = var1 * ((double)calib_data->dig_T2);
mcm 2:853301624d95 696 var2 = (((double)uncomp_data->temperature) / 131072.0 - ((double)calib_data->dig_T1) / 8192.0);
mcm 2:853301624d95 697 var2 = (var2 * var2) * ((double)calib_data->dig_T3);
mcm 2:853301624d95 698 calib_data->t_fine = (int32_t)(var1 + var2);
mcm 2:853301624d95 699 temperature = (var1 + var2) / 5120.0;
mcm 2:853301624d95 700 if (temperature < temperature_min) {
mcm 2:853301624d95 701 temperature = temperature_min;
mcm 2:853301624d95 702 } else if (temperature > temperature_max) {
mcm 2:853301624d95 703 temperature = temperature_max;
mcm 2:853301624d95 704 }
mcm 2:853301624d95 705
mcm 2:853301624d95 706 return temperature;
mcm 2:853301624d95 707 }
mcm 2:853301624d95 708
mcm 2:853301624d95 709 /*!
mcm 2:853301624d95 710 * @brief This internal API is used to compensate the raw pressure data and
mcm 2:853301624d95 711 * return the compensated pressure data in double data type.
mcm 2:853301624d95 712 */
mcm 3:ab857b70346e 713 double BME280::compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 714 const struct bme280_calib_data *calib_data)
mcm 2:853301624d95 715 {
mcm 2:853301624d95 716 double var1;
mcm 2:853301624d95 717 double var2;
mcm 2:853301624d95 718 double var3;
mcm 2:853301624d95 719 double pressure;
mcm 2:853301624d95 720 double pressure_min = 30000.0;
mcm 2:853301624d95 721 double pressure_max = 110000.0;
mcm 2:853301624d95 722
mcm 2:853301624d95 723 var1 = ((double)calib_data->t_fine / 2.0) - 64000.0;
mcm 2:853301624d95 724 var2 = var1 * var1 * ((double)calib_data->dig_P6) / 32768.0;
mcm 2:853301624d95 725 var2 = var2 + var1 * ((double)calib_data->dig_P5) * 2.0;
mcm 2:853301624d95 726 var2 = (var2 / 4.0) + (((double)calib_data->dig_P4) * 65536.0);
mcm 2:853301624d95 727 var3 = ((double)calib_data->dig_P3) * var1 * var1 / 524288.0;
mcm 2:853301624d95 728 var1 = (var3 + ((double)calib_data->dig_P2) * var1) / 524288.0;
mcm 2:853301624d95 729 var1 = (1.0 + var1 / 32768.0) * ((double)calib_data->dig_P1);
mcm 2:853301624d95 730
mcm 2:853301624d95 731 /* avoid exception caused by division by zero */
mcm 2:853301624d95 732 if (var1) {
mcm 2:853301624d95 733 pressure = 1048576.0 - (double) uncomp_data->pressure;
mcm 2:853301624d95 734 pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1;
mcm 2:853301624d95 735 var1 = ((double)calib_data->dig_P9) * pressure * pressure / 2147483648.0;
mcm 2:853301624d95 736 var2 = pressure * ((double)calib_data->dig_P8) / 32768.0;
mcm 2:853301624d95 737 pressure = pressure + (var1 + var2 + ((double)calib_data->dig_P7)) / 16.0;
mcm 2:853301624d95 738 if (pressure < pressure_min) {
mcm 2:853301624d95 739 pressure = pressure_min;
mcm 2:853301624d95 740 } else if (pressure > pressure_max) {
mcm 2:853301624d95 741 pressure = pressure_max;
mcm 2:853301624d95 742 }
mcm 2:853301624d95 743 } else { /* Invalid case */
mcm 2:853301624d95 744 pressure = pressure_min;
mcm 2:853301624d95 745 }
mcm 2:853301624d95 746
mcm 2:853301624d95 747 return pressure;
mcm 2:853301624d95 748 }
mcm 2:853301624d95 749
mcm 2:853301624d95 750 /*!
mcm 2:853301624d95 751 * @brief This internal API is used to compensate the raw humidity data and
mcm 2:853301624d95 752 * return the compensated humidity data in double data type.
mcm 2:853301624d95 753 */
mcm 3:ab857b70346e 754 double BME280::compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 755 const struct bme280_calib_data *calib_data)
mcm 2:853301624d95 756 {
mcm 2:853301624d95 757 double humidity;
mcm 2:853301624d95 758 double humidity_min = 0.0;
mcm 2:853301624d95 759 double humidity_max = 100.0;
mcm 2:853301624d95 760 double var1;
mcm 2:853301624d95 761 double var2;
mcm 2:853301624d95 762 double var3;
mcm 2:853301624d95 763 double var4;
mcm 2:853301624d95 764 double var5;
mcm 2:853301624d95 765 double var6;
mcm 2:853301624d95 766
mcm 2:853301624d95 767 var1 = ((double)calib_data->t_fine) - 76800.0;
mcm 2:853301624d95 768 var2 = (((double)calib_data->dig_H4) * 64.0 + (((double)calib_data->dig_H5) / 16384.0) * var1);
mcm 2:853301624d95 769 var3 = uncomp_data->humidity - var2;
mcm 2:853301624d95 770 var4 = ((double)calib_data->dig_H2) / 65536.0;
mcm 2:853301624d95 771 var5 = (1.0 + (((double)calib_data->dig_H3) / 67108864.0) * var1);
mcm 2:853301624d95 772 var6 = 1.0 + (((double)calib_data->dig_H6) / 67108864.0) * var1 * var5;
mcm 2:853301624d95 773 var6 = var3 * var4 * (var5 * var6);
mcm 2:853301624d95 774 humidity = var6 * (1.0 - ((double)calib_data->dig_H1) * var6 / 524288.0);
mcm 2:853301624d95 775 if (humidity > humidity_max) {
mcm 2:853301624d95 776 humidity = humidity_max;
mcm 2:853301624d95 777 } else if (humidity < humidity_min) {
mcm 2:853301624d95 778 humidity = humidity_min;
mcm 2:853301624d95 779 }
mcm 2:853301624d95 780
mcm 2:853301624d95 781 return humidity;
mcm 2:853301624d95 782 }
mcm 2:853301624d95 783
mcm 2:853301624d95 784 #else
mcm 2:853301624d95 785
mcm 2:853301624d95 786 /*!
mcm 2:853301624d95 787 * @brief This internal API is used to compensate the raw temperature data and
mcm 2:853301624d95 788 * return the compensated temperature data in integer data type.
mcm 2:853301624d95 789 */
mcm 3:ab857b70346e 790 int32_t BME280::compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 791 struct bme280_calib_data *calib_data)
mcm 2:853301624d95 792 {
mcm 2:853301624d95 793 int32_t var1;
mcm 2:853301624d95 794 int32_t var2;
mcm 2:853301624d95 795 int32_t temperature;
mcm 2:853301624d95 796 int32_t temperature_min = -4000;
mcm 2:853301624d95 797 int32_t temperature_max = 8500;
mcm 2:853301624d95 798
mcm 2:853301624d95 799 var1 = (int32_t)((uncomp_data->temperature / 8) - ((int32_t)calib_data->dig_T1 * 2));
mcm 2:853301624d95 800 var1 = (var1 * ((int32_t)calib_data->dig_T2)) / 2048;
mcm 2:853301624d95 801 var2 = (int32_t)((uncomp_data->temperature / 16) - ((int32_t)calib_data->dig_T1));
mcm 2:853301624d95 802 var2 = (((var2 * var2) / 4096) * ((int32_t)calib_data->dig_T3)) / 16384;
mcm 2:853301624d95 803 calib_data->t_fine = var1 + var2;
mcm 2:853301624d95 804 temperature = (calib_data->t_fine * 5 + 128) / 256;
mcm 2:853301624d95 805 if (temperature < temperature_min) {
mcm 2:853301624d95 806 temperature = temperature_min;
mcm 2:853301624d95 807 } else if (temperature > temperature_max) {
mcm 2:853301624d95 808 temperature = temperature_max;
mcm 2:853301624d95 809 }
mcm 2:853301624d95 810
mcm 2:853301624d95 811 return temperature;
mcm 2:853301624d95 812 }
mcm 2:853301624d95 813 #ifdef BME280_64BIT_ENABLE
mcm 2:853301624d95 814
mcm 2:853301624d95 815 /*!
mcm 2:853301624d95 816 * @brief This internal API is used to compensate the raw pressure data and
mcm 2:853301624d95 817 * return the compensated pressure data in integer data type with higher
mcm 2:853301624d95 818 * accuracy.
mcm 2:853301624d95 819 */
mcm 3:ab857b70346e 820 uint32_t BME280::compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 821 const struct bme280_calib_data *calib_data)
mcm 2:853301624d95 822 {
mcm 2:853301624d95 823 int64_t var1;
mcm 2:853301624d95 824 int64_t var2;
mcm 2:853301624d95 825 int64_t var3;
mcm 2:853301624d95 826 int64_t var4;
mcm 2:853301624d95 827 uint32_t pressure;
mcm 2:853301624d95 828 uint32_t pressure_min = 3000000;
mcm 2:853301624d95 829 uint32_t pressure_max = 11000000;
mcm 2:853301624d95 830
mcm 2:853301624d95 831 var1 = ((int64_t)calib_data->t_fine) - 128000;
mcm 2:853301624d95 832 var2 = var1 * var1 * (int64_t)calib_data->dig_P6;
mcm 2:853301624d95 833 var2 = var2 + ((var1 * (int64_t)calib_data->dig_P5) * 131072);
mcm 2:853301624d95 834 var2 = var2 + (((int64_t)calib_data->dig_P4) * 34359738368);
mcm 2:853301624d95 835 var1 = ((var1 * var1 * (int64_t)calib_data->dig_P3) / 256) + ((var1 * ((int64_t)calib_data->dig_P2) * 4096));
mcm 2:853301624d95 836 var3 = ((int64_t)1) * 140737488355328;
mcm 2:853301624d95 837 var1 = (var3 + var1) * ((int64_t)calib_data->dig_P1) / 8589934592;
mcm 2:853301624d95 838
mcm 2:853301624d95 839 /* To avoid divide by zero exception */
mcm 2:853301624d95 840 if (var1 != 0) {
mcm 2:853301624d95 841 var4 = 1048576 - uncomp_data->pressure;
mcm 2:853301624d95 842 var4 = (((var4 * INT64_C(2147483648)) - var2) * 3125) / var1;
mcm 2:853301624d95 843 var1 = (((int64_t)calib_data->dig_P9) * (var4 / 8192) * (var4 / 8192)) / 33554432;
mcm 2:853301624d95 844 var2 = (((int64_t)calib_data->dig_P8) * var4) / 524288;
mcm 2:853301624d95 845 var4 = ((var4 + var1 + var2) / 256) + (((int64_t)calib_data->dig_P7) * 16);
mcm 2:853301624d95 846 pressure = (uint32_t)(((var4 / 2) * 100) / 128);
mcm 2:853301624d95 847 if (pressure < pressure_min) {
mcm 2:853301624d95 848 pressure = pressure_min;
mcm 2:853301624d95 849 } else if (pressure > pressure_max) {
mcm 2:853301624d95 850 pressure = pressure_max;
mcm 2:853301624d95 851 }
mcm 2:853301624d95 852 } else {
mcm 2:853301624d95 853 pressure = pressure_min;
mcm 2:853301624d95 854 }
mcm 2:853301624d95 855
mcm 2:853301624d95 856 return pressure;
mcm 2:853301624d95 857 }
mcm 2:853301624d95 858 #else
mcm 2:853301624d95 859
mcm 2:853301624d95 860 /*!
mcm 2:853301624d95 861 * @brief This internal API is used to compensate the raw pressure data and
mcm 2:853301624d95 862 * return the compensated pressure data in integer data type.
mcm 2:853301624d95 863 */
mcm 3:ab857b70346e 864 uint32_t BME280::compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 865 const struct bme280_calib_data *calib_data)
mcm 2:853301624d95 866 {
mcm 2:853301624d95 867 int32_t var1;
mcm 2:853301624d95 868 int32_t var2;
mcm 2:853301624d95 869 int32_t var3;
mcm 2:853301624d95 870 int32_t var4;
mcm 2:853301624d95 871 uint32_t var5;
mcm 2:853301624d95 872 uint32_t pressure;
mcm 2:853301624d95 873 uint32_t pressure_min = 30000;
mcm 2:853301624d95 874 uint32_t pressure_max = 110000;
mcm 2:853301624d95 875
mcm 2:853301624d95 876 var1 = (((int32_t)calib_data->t_fine) / 2) - (int32_t)64000;
mcm 2:853301624d95 877 var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t)calib_data->dig_P6);
mcm 2:853301624d95 878 var2 = var2 + ((var1 * ((int32_t)calib_data->dig_P5)) * 2);
mcm 2:853301624d95 879 var2 = (var2 / 4) + (((int32_t)calib_data->dig_P4) * 65536);
mcm 2:853301624d95 880 var3 = (calib_data->dig_P3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8;
mcm 2:853301624d95 881 var4 = (((int32_t)calib_data->dig_P2) * var1) / 2;
mcm 2:853301624d95 882 var1 = (var3 + var4) / 262144;
mcm 2:853301624d95 883 var1 = (((32768 + var1)) * ((int32_t)calib_data->dig_P1)) / 32768;
mcm 2:853301624d95 884
mcm 2:853301624d95 885 /* avoid exception caused by division by zero */
mcm 2:853301624d95 886 if (var1) {
mcm 2:853301624d95 887 var5 = (uint32_t)((uint32_t)1048576) - uncomp_data->pressure;
mcm 2:853301624d95 888 pressure = ((uint32_t)(var5 - (uint32_t)(var2 / 4096))) * 3125;
mcm 2:853301624d95 889 if (pressure < 0x80000000) {
mcm 2:853301624d95 890 pressure = (pressure << 1) / ((uint32_t)var1);
mcm 2:853301624d95 891 } else {
mcm 2:853301624d95 892 pressure = (pressure / (uint32_t)var1) * 2;
mcm 2:853301624d95 893 }
mcm 2:853301624d95 894 var1 = (((int32_t)calib_data->dig_P9) * ((int32_t)(((pressure / 8) * (pressure / 8)) / 8192))) / 4096;
mcm 2:853301624d95 895 var2 = (((int32_t)(pressure / 4)) * ((int32_t)calib_data->dig_P8)) / 8192;
mcm 2:853301624d95 896 pressure = (uint32_t)((int32_t)pressure + ((var1 + var2 + calib_data->dig_P7) / 16));
mcm 2:853301624d95 897 if (pressure < pressure_min) {
mcm 2:853301624d95 898 pressure = pressure_min;
mcm 2:853301624d95 899 } else if (pressure > pressure_max) {
mcm 2:853301624d95 900 pressure = pressure_max;
mcm 2:853301624d95 901 }
mcm 2:853301624d95 902 } else {
mcm 2:853301624d95 903 pressure = pressure_min;
mcm 2:853301624d95 904 }
mcm 2:853301624d95 905
mcm 2:853301624d95 906 return pressure;
mcm 2:853301624d95 907 }
mcm 2:853301624d95 908 #endif
mcm 2:853301624d95 909
mcm 2:853301624d95 910 /*!
mcm 2:853301624d95 911 * @brief This internal API is used to compensate the raw humidity data and
mcm 2:853301624d95 912 * return the compensated humidity data in integer data type.
mcm 2:853301624d95 913 */
mcm 3:ab857b70346e 914 uint32_t BME280::compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
mcm 2:853301624d95 915 const struct bme280_calib_data *calib_data)
mcm 2:853301624d95 916 {
mcm 2:853301624d95 917 int32_t var1;
mcm 2:853301624d95 918 int32_t var2;
mcm 2:853301624d95 919 int32_t var3;
mcm 2:853301624d95 920 int32_t var4;
mcm 2:853301624d95 921 int32_t var5;
mcm 2:853301624d95 922 uint32_t humidity;
mcm 2:853301624d95 923 uint32_t humidity_max = 102400;
mcm 2:853301624d95 924
mcm 2:853301624d95 925 var1 = calib_data->t_fine - ((int32_t)76800);
mcm 2:853301624d95 926 var2 = (int32_t)(uncomp_data->humidity * 16384);
mcm 2:853301624d95 927 var3 = (int32_t)(((int32_t)calib_data->dig_H4) * 1048576);
mcm 2:853301624d95 928 var4 = ((int32_t)calib_data->dig_H5) * var1;
mcm 2:853301624d95 929 var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
mcm 2:853301624d95 930 var2 = (var1 * ((int32_t)calib_data->dig_H6)) / 1024;
mcm 2:853301624d95 931 var3 = (var1 * ((int32_t)calib_data->dig_H3)) / 2048;
mcm 2:853301624d95 932 var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
mcm 2:853301624d95 933 var2 = ((var4 * ((int32_t)calib_data->dig_H2)) + 8192) / 16384;
mcm 2:853301624d95 934 var3 = var5 * var2;
mcm 2:853301624d95 935 var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
mcm 2:853301624d95 936 var5 = var3 - ((var4 * ((int32_t)calib_data->dig_H1)) / 16);
mcm 2:853301624d95 937 var5 = (var5 < 0 ? 0 : var5);
mcm 2:853301624d95 938 var5 = (var5 > 419430400 ? 419430400 : var5);
mcm 2:853301624d95 939 humidity = (uint32_t)(var5 / 4096);
mcm 2:853301624d95 940 if (humidity > humidity_max) {
mcm 2:853301624d95 941 humidity = humidity_max;
mcm 2:853301624d95 942 }
mcm 2:853301624d95 943
mcm 2:853301624d95 944 return humidity;
mcm 2:853301624d95 945 }
mcm 2:853301624d95 946 #endif
mcm 2:853301624d95 947
mcm 2:853301624d95 948 /*!
mcm 2:853301624d95 949 * @brief This internal API reads the calibration data from the sensor, parse
mcm 2:853301624d95 950 * it and store in the device structure.
mcm 2:853301624d95 951 */
mcm 3:ab857b70346e 952 int8_t BME280::get_calib_data(struct bme280_dev *dev)
mcm 2:853301624d95 953 {
mcm 2:853301624d95 954 int8_t rslt;
mcm 2:853301624d95 955 uint8_t reg_addr = BME280_TEMP_PRESS_CALIB_DATA_ADDR;
mcm 2:853301624d95 956
mcm 2:853301624d95 957 /* Array to store calibration data */
mcm 2:853301624d95 958 uint8_t calib_data[BME280_TEMP_PRESS_CALIB_DATA_LEN] = { 0 };
mcm 2:853301624d95 959
mcm 2:853301624d95 960 /* Read the calibration data from the sensor */
mcm 2:853301624d95 961 rslt = bme280_get_regs(reg_addr, calib_data, BME280_TEMP_PRESS_CALIB_DATA_LEN, dev);
mcm 2:853301624d95 962 if (rslt == BME280_OK) {
mcm 2:853301624d95 963 /* Parse temperature and pressure calibration data and store
mcm 2:853301624d95 964 * it in device structure
mcm 2:853301624d95 965 */
mcm 2:853301624d95 966 parse_temp_press_calib_data(calib_data, dev);
mcm 2:853301624d95 967 reg_addr = BME280_HUMIDITY_CALIB_DATA_ADDR;
mcm 2:853301624d95 968
mcm 2:853301624d95 969 /* Read the humidity calibration data from the sensor */
mcm 2:853301624d95 970 rslt = bme280_get_regs(reg_addr, calib_data, BME280_HUMIDITY_CALIB_DATA_LEN, dev);
mcm 2:853301624d95 971 if (rslt == BME280_OK) {
mcm 2:853301624d95 972 /* Parse humidity calibration data and store it in
mcm 2:853301624d95 973 * device structure
mcm 2:853301624d95 974 */
mcm 2:853301624d95 975 parse_humidity_calib_data(calib_data, dev);
mcm 2:853301624d95 976 }
mcm 2:853301624d95 977 }
mcm 2:853301624d95 978
mcm 2:853301624d95 979 return rslt;
mcm 2:853301624d95 980 }
mcm 2:853301624d95 981
mcm 2:853301624d95 982 /*!
mcm 2:853301624d95 983 * @brief This internal API interleaves the register address between the
mcm 2:853301624d95 984 * register data buffer for burst write operation.
mcm 2:853301624d95 985 */
mcm 3:ab857b70346e 986 void BME280::interleave_reg_addr(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len)
mcm 2:853301624d95 987 {
mcm 2:853301624d95 988 uint8_t index;
mcm 2:853301624d95 989
mcm 2:853301624d95 990 for (index = 1; index < len; index++) {
mcm 2:853301624d95 991 temp_buff[(index * 2) - 1] = reg_addr[index];
mcm 2:853301624d95 992 temp_buff[index * 2] = reg_data[index];
mcm 2:853301624d95 993 }
mcm 2:853301624d95 994 }
mcm 2:853301624d95 995
mcm 2:853301624d95 996 /*!
mcm 2:853301624d95 997 * @brief This internal API is used to parse the temperature and
mcm 2:853301624d95 998 * pressure calibration data and store it in device structure.
mcm 2:853301624d95 999 */
mcm 3:ab857b70346e 1000 void BME280::parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
mcm 2:853301624d95 1001 {
mcm 2:853301624d95 1002 struct bme280_calib_data *calib_data = &dev->calib_data;
mcm 2:853301624d95 1003
mcm 2:853301624d95 1004 calib_data->dig_T1 = BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
mcm 2:853301624d95 1005 calib_data->dig_T2 = (int16_t)BME280_CONCAT_BYTES(reg_data[3], reg_data[2]);
mcm 2:853301624d95 1006 calib_data->dig_T3 = (int16_t)BME280_CONCAT_BYTES(reg_data[5], reg_data[4]);
mcm 2:853301624d95 1007 calib_data->dig_P1 = BME280_CONCAT_BYTES(reg_data[7], reg_data[6]);
mcm 2:853301624d95 1008 calib_data->dig_P2 = (int16_t)BME280_CONCAT_BYTES(reg_data[9], reg_data[8]);
mcm 2:853301624d95 1009 calib_data->dig_P3 = (int16_t)BME280_CONCAT_BYTES(reg_data[11], reg_data[10]);
mcm 2:853301624d95 1010 calib_data->dig_P4 = (int16_t)BME280_CONCAT_BYTES(reg_data[13], reg_data[12]);
mcm 2:853301624d95 1011 calib_data->dig_P5 = (int16_t)BME280_CONCAT_BYTES(reg_data[15], reg_data[14]);
mcm 2:853301624d95 1012 calib_data->dig_P6 = (int16_t)BME280_CONCAT_BYTES(reg_data[17], reg_data[16]);
mcm 2:853301624d95 1013 calib_data->dig_P7 = (int16_t)BME280_CONCAT_BYTES(reg_data[19], reg_data[18]);
mcm 2:853301624d95 1014 calib_data->dig_P8 = (int16_t)BME280_CONCAT_BYTES(reg_data[21], reg_data[20]);
mcm 2:853301624d95 1015 calib_data->dig_P9 = (int16_t)BME280_CONCAT_BYTES(reg_data[23], reg_data[22]);
mcm 2:853301624d95 1016 calib_data->dig_H1 = reg_data[25];
mcm 2:853301624d95 1017 }
mcm 2:853301624d95 1018
mcm 2:853301624d95 1019 /*!
mcm 2:853301624d95 1020 * @brief This internal API is used to parse the humidity calibration data
mcm 2:853301624d95 1021 * and store it in device structure.
mcm 2:853301624d95 1022 */
mcm 3:ab857b70346e 1023 void BME280::parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
mcm 2:853301624d95 1024 {
mcm 2:853301624d95 1025 struct bme280_calib_data *calib_data = &dev->calib_data;
mcm 2:853301624d95 1026 int16_t dig_H4_lsb;
mcm 2:853301624d95 1027 int16_t dig_H4_msb;
mcm 2:853301624d95 1028 int16_t dig_H5_lsb;
mcm 2:853301624d95 1029 int16_t dig_H5_msb;
mcm 2:853301624d95 1030
mcm 2:853301624d95 1031 calib_data->dig_H2 = (int16_t)BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
mcm 2:853301624d95 1032 calib_data->dig_H3 = reg_data[2];
mcm 2:853301624d95 1033 dig_H4_msb = (int16_t)(int8_t)reg_data[3] * 16;
mcm 2:853301624d95 1034 dig_H4_lsb = (int16_t)(reg_data[4] & 0x0F);
mcm 2:853301624d95 1035 calib_data->dig_H4 = dig_H4_msb | dig_H4_lsb;
mcm 2:853301624d95 1036 dig_H5_msb = (int16_t)(int8_t)reg_data[5] * 16;
mcm 2:853301624d95 1037 dig_H5_lsb = (int16_t)(reg_data[4] >> 4);
mcm 2:853301624d95 1038 calib_data->dig_H5 = dig_H5_msb | dig_H5_lsb;
mcm 2:853301624d95 1039 calib_data->dig_H6 = (int8_t)reg_data[6];
mcm 2:853301624d95 1040 }
mcm 2:853301624d95 1041
mcm 2:853301624d95 1042 /*!
mcm 2:853301624d95 1043 * @brief This internal API is used to identify the settings which the user
mcm 2:853301624d95 1044 * wants to modify in the sensor.
mcm 2:853301624d95 1045 */
mcm 3:ab857b70346e 1046 uint8_t BME280::are_settings_changed(uint8_t sub_settings, uint8_t desired_settings)
mcm 2:853301624d95 1047 {
mcm 2:853301624d95 1048 uint8_t settings_changed = FALSE;
mcm 2:853301624d95 1049
mcm 2:853301624d95 1050 if (sub_settings & desired_settings) {
mcm 2:853301624d95 1051 /* User wants to modify this particular settings */
mcm 2:853301624d95 1052 settings_changed = TRUE;
mcm 2:853301624d95 1053 } else {
mcm 2:853301624d95 1054 /* User don't want to modify this particular settings */
mcm 2:853301624d95 1055 settings_changed = FALSE;
mcm 2:853301624d95 1056 }
mcm 2:853301624d95 1057
mcm 2:853301624d95 1058 return settings_changed;
mcm 2:853301624d95 1059 }
mcm 2:853301624d95 1060
mcm 2:853301624d95 1061 /*!
mcm 2:853301624d95 1062 * @brief This internal API is used to validate the device structure pointer for
mcm 2:853301624d95 1063 * null conditions.
mcm 2:853301624d95 1064 */
mcm 3:ab857b70346e 1065 int8_t BME280::null_ptr_check(const struct bme280_dev *dev)
mcm 2:853301624d95 1066 {
mcm 2:853301624d95 1067 int8_t rslt;
mcm 2:853301624d95 1068
mcm 2:853301624d95 1069 if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL)) {
mcm 2:853301624d95 1070 /* Device structure pointer is not valid */
mcm 2:853301624d95 1071 rslt = BME280_E_NULL_PTR;
mcm 2:853301624d95 1072 } else {
mcm 2:853301624d95 1073 /* Device structure is fine */
mcm 2:853301624d95 1074 rslt = BME280_OK;
mcm 2:853301624d95 1075 }
mcm 2:853301624d95 1076
mcm 2:853301624d95 1077 return rslt;
mcm 2:853301624d95 1078 }