2 * Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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16 * 3. Neither the name of the copyright holder nor the names of its
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17 * contributors may be used to endorse or promote products derived from
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18 * this software without specific prior written permission.
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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31 * POSSIBILITY OF SUCH DAMAGE.
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40 * @brief Sensor driver for BME280 sensor
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44 /**\name Internal macros */
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45 /* To identify osr settings selected by user */
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46 #define OVERSAMPLING_SETTINGS UINT8_C(0x07)
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48 /* To identify filter and standby settings selected by user */
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49 #define FILTER_STANDBY_SETTINGS UINT8_C(0x18)
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52 * @brief This internal API puts the device to sleep mode.
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54 * @param[in] dev : Structure instance of bme280_dev.
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56 * @return Result of API execution status.
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58 * @retval 0 -> Success.
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59 * @retval > 0 -> Warning.
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60 * @retval < 0 -> Fail.
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63 static int8_t put_device_to_sleep(struct bme280_dev *dev);
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66 * @brief This internal API writes the power mode in the sensor.
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68 * @param[in] dev : Structure instance of bme280_dev.
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69 * @param[in] sensor_mode : Variable which contains the power mode to be set.
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71 * @return Result of API execution status.
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73 * @retval 0 -> Success.
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74 * @retval > 0 -> Warning.
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75 * @retval < 0 -> Fail.
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78 static int8_t write_power_mode(uint8_t sensor_mode, struct bme280_dev *dev);
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81 * @brief This internal API is used to validate the device pointer for
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84 * @param[in] dev : Structure instance of bme280_dev.
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86 * @return Result of API execution status
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88 * @retval 0 -> Success.
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89 * @retval > 0 -> Warning.
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90 * @retval < 0 -> Fail.
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93 static int8_t null_ptr_check(const struct bme280_dev *dev);
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96 * @brief This internal API interleaves the register address between the
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97 * register data buffer for burst write operation.
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99 * @param[in] reg_addr : Contains the register address array.
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100 * @param[out] temp_buff : Contains the temporary buffer to store the
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101 * register data and register address.
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102 * @param[in] reg_data : Contains the register data to be written in the
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103 * temporary buffer.
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104 * @param[in] len : No of bytes of data to be written for burst write.
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107 static void interleave_reg_addr(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len);
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110 * @brief This internal API reads the calibration data from the sensor, parse
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111 * it and store in the device structure.
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113 * @param[in] dev : Structure instance of bme280_dev.
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115 * @return Result of API execution status
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117 * @retval 0 -> Success.
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118 * @retval > 0 -> Warning.
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119 * @retval < 0 -> Fail.
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122 static int8_t get_calib_data(struct bme280_dev *dev);
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125 * @brief This internal API is used to parse the temperature and
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126 * pressure calibration data and store it in the device structure.
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128 * @param[out] dev : Structure instance of bme280_dev to store the calib data.
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129 * @param[in] reg_data : Contains the calibration data to be parsed.
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132 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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135 * @brief This internal API is used to parse the humidity calibration data
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136 * and store it in device structure.
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138 * @param[out] dev : Structure instance of bme280_dev to store the calib data.
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139 * @param[in] reg_data : Contains calibration data to be parsed.
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142 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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144 #ifdef BME280_FLOAT_ENABLE
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147 * @brief This internal API is used to compensate the raw pressure data and
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148 * return the compensated pressure data in double data type.
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150 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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151 * @param[in] calib_data : Pointer to the calibration data structure.
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153 * @return Compensated pressure data in double.
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156 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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157 const struct bme280_calib_data *calib_data);
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160 * @brief This internal API is used to compensate the raw humidity data and
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161 * return the compensated humidity data in double data type.
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163 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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164 * @param[in] calib_data : Pointer to the calibration data structure.
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166 * @return Compensated humidity data in double.
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169 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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170 const struct bme280_calib_data *calib_data);
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173 * @brief This internal API is used to compensate the raw temperature data and
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174 * return the compensated temperature data in double data type.
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176 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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177 * @param[in] calib_data : Pointer to calibration data structure.
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179 * @return Compensated temperature data in double.
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182 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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183 struct bme280_calib_data *calib_data);
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188 * @brief This internal API is used to compensate the raw temperature data and
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189 * return the compensated temperature data in integer data type.
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191 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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192 * @param[in] calib_data : Pointer to calibration data structure.
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194 * @return Compensated temperature data in integer.
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197 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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198 struct bme280_calib_data *calib_data);
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201 * @brief This internal API is used to compensate the raw pressure data and
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202 * return the compensated pressure data in integer data type.
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204 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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205 * @param[in] calib_data : Pointer to the calibration data structure.
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207 * @return Compensated pressure data in integer.
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210 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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211 const struct bme280_calib_data *calib_data);
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214 * @brief This internal API is used to compensate the raw humidity data and
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215 * return the compensated humidity data in integer data type.
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217 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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218 * @param[in] calib_data : Pointer to the calibration data structure.
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220 * @return Compensated humidity data in integer.
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223 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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224 const struct bme280_calib_data *calib_data);
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229 * @brief This internal API is used to identify the settings which the user
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230 * wants to modify in the sensor.
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232 * @param[in] sub_settings : Contains the settings subset to identify particular
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233 * group of settings which the user is interested to change.
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234 * @param[in] desired_settings : Contains the user specified settings.
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236 * @return Indicates whether user is interested to modify the settings which
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237 * are related to sub_settings.
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238 * @return True -> User wants to modify this group of settings
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239 * @return False -> User does not want to modify this group of settings
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242 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings);
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245 * @brief This API sets the humidity over sampling settings of the sensor.
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247 * @param[in] dev : Structure instance of bme280_dev.
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248 * @param[in] settings : Pointer variable which contains the settings to
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249 * be set in the sensor.
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251 * @return Result of API execution status
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253 * @retval 0 -> Success.
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254 * @retval > 0 -> Warning.
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255 * @retval < 0 -> Fail.
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258 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, struct bme280_dev *dev);
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261 * @brief This internal API sets the oversampling settings for pressure,
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262 * temperature and humidity in the sensor.
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264 * @param[in] desired_settings : Variable used to select the settings which
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266 * @param[in] settings : Pointer variable which contains the settings to
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267 * be set in the sensor.
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268 * @param[in] dev : Structure instance of bme280_dev.
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270 * @return Result of API execution status
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272 * @retval 0 -> Success.
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273 * @retval > 0 -> Warning.
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274 * @retval < 0 -> Fail.
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277 static int8_t set_osr_settings(uint8_t desired_settings, const struct bme280_settings *settings,
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278 struct bme280_dev *dev);
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281 * @brief This API sets the pressure and/or temperature oversampling settings
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282 * in the sensor according to the settings selected by the user.
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284 * @param[in] dev : Structure instance of bme280_dev.
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285 * @param[in] desired_settings: variable to select the pressure and/or
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286 * temperature oversampling settings.
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287 * @param[in] settings : Pointer variable which contains the settings to
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288 * be set in the sensor.
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290 * @return Result of API execution status
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292 * @retval 0 -> Success.
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293 * @retval > 0 -> Warning.
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294 * @retval < 0 -> Fail.
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297 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
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298 const struct bme280_settings *settings,
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299 struct bme280_dev *dev);
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302 * @brief This internal API fills the pressure oversampling settings provided by
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303 * the user in the data buffer so as to write in the sensor.
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305 * @param[in] settings : Pointer variable which contains the settings to
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306 * be set in the sensor.
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307 * @param[out] reg_data : Variable which is filled according to the pressure
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308 * oversampling data provided by the user.
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311 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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314 * @brief This internal API fills the temperature oversampling settings provided
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315 * by the user in the data buffer so as to write in the sensor.
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317 * @param[in] settings : Pointer variable which contains the settings to
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318 * be set in the sensor.
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319 * @param[out] reg_data : Variable which is filled according to the temperature
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320 * oversampling data provided by the user.
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323 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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326 * @brief This internal API sets the filter and/or standby duration settings
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327 * in the sensor according to the settings selected by the user.
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329 * @param[in] dev : Structure instance of bme280_dev.
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330 * @param[in] settings : Pointer variable which contains the settings to
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331 * be set in the sensor.
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332 * @param[in] settings : Structure instance of bme280_settings.
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334 * @return Result of API execution status
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336 * @retval 0 -> Success.
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337 * @retval > 0 -> Warning.
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338 * @retval < 0 -> Fail.
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341 static int8_t set_filter_standby_settings(uint8_t desired_settings,
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342 const struct bme280_settings *settings,
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343 struct bme280_dev *dev);
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346 * @brief This internal API fills the filter settings provided by the user
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347 * in the data buffer so as to write in the sensor.
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349 * @param[in] settings : Pointer variable which contains the settings to
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350 * be set in the sensor.
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351 * @param[out] reg_data : Variable which is filled according to the filter
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352 * settings data provided by the user.
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355 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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358 * @brief This internal API fills the standby duration settings provided by the
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359 * user in the data buffer so as to write in the sensor.
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361 * @param[in] settings : Pointer variable which contains the settings to
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362 * be set in the sensor.
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363 * @param[out] reg_data : Variable which is filled according to the standby
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364 * settings data provided by the user.
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367 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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370 * @brief This internal API parse the oversampling(pressure, temperature
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371 * and humidity), filter and standby duration settings and store in the
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372 * device structure.
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374 * @param[in] settings : Pointer variable which contains the settings to
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375 * be get in the sensor.
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376 * @param[in] reg_data : Register data to be parsed.
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379 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings);
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382 * @brief This internal API reloads the already existing device settings in the
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383 * sensor after soft reset.
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385 * @param[in] dev : Structure instance of bme280_dev.
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386 * @param[in] settings : Pointer variable which contains the settings to
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387 * be set in the sensor.
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389 * @return Result of API execution status
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391 * @retval 0 -> Success.
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392 * @retval > 0 -> Warning.
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393 * @retval < 0 -> Fail.
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396 static int8_t reload_device_settings(const struct bme280_settings *settings, struct bme280_dev *dev);
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398 /****************** Global Function Definitions *******************************/
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401 * @brief This API is the entry point.
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402 * It reads the chip-id and calibration data from the sensor.
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404 int8_t bme280_init(struct bme280_dev *dev)
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408 /* chip id read try count */
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409 uint8_t try_count = 5;
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410 uint8_t chip_id = 0;
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412 /* Check for null pointer in the device structure*/
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413 rslt = null_ptr_check(dev);
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415 /* Proceed if null check is fine */
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416 if (rslt == BME280_OK)
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420 /* Read the chip-id of bme280 sensor */
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421 rslt = bme280_get_regs(BME280_CHIP_ID_ADDR, &chip_id, 1, dev);
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423 /* Check for chip id validity */
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424 if ((rslt == BME280_OK) && (chip_id == BME280_CHIP_ID))
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426 dev->chip_id = chip_id;
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428 /* Reset the sensor */
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429 rslt = bme280_soft_reset(dev);
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431 if (rslt == BME280_OK)
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433 /* Read the calibration data */
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434 rslt = get_calib_data(dev);
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440 /* Wait for 1 ms */
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441 dev->delay_us(1000, dev->intf_ptr);
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445 /* Chip id check failed */
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448 rslt = BME280_E_DEV_NOT_FOUND;
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456 * @brief This API reads the data from the given register address of the sensor.
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458 int8_t bme280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, struct bme280_dev *dev)
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462 /* Check for null pointer in the device structure*/
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463 rslt = null_ptr_check(dev);
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465 /* Proceed if null check is fine */
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466 if ((rslt == BME280_OK) && (reg_data != NULL))
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468 /* If interface selected is SPI */
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469 if (dev->intf != BME280_I2C_INTF)
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471 reg_addr = reg_addr | 0x80;
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474 /* Read the data */
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475 dev->intf_rslt = dev->read(reg_addr, reg_data, len, dev->intf_ptr);
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477 /* Check for communication error */
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478 if (dev->intf_rslt != BME280_INTF_RET_SUCCESS)
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480 rslt = BME280_E_COMM_FAIL;
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485 rslt = BME280_E_NULL_PTR;
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492 * @brief This API writes the given data to the register address
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495 int8_t bme280_set_regs(uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, struct bme280_dev *dev)
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498 uint8_t temp_buff[20]; /* Typically not to write more than 10 registers */
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506 uint8_t reg_addr_cnt;
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508 /* Check for null pointer in the device structure*/
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509 rslt = null_ptr_check(dev);
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511 /* Check for arguments validity */
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512 if ((rslt == BME280_OK) && (reg_addr != NULL) && (reg_data != NULL))
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516 temp_buff[0] = reg_data[0];
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518 /* If interface selected is SPI */
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519 if (dev->intf != BME280_I2C_INTF)
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521 for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++)
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523 reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
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527 /* Burst write mode */
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530 /* Interleave register address w.r.t data for
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533 interleave_reg_addr(reg_addr, temp_buff, reg_data, len);
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534 temp_len = ((len * 2) - 1);
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541 dev->intf_rslt = dev->write(reg_addr[0], temp_buff, temp_len, dev->intf_ptr);
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543 /* Check for communication error */
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544 if (dev->intf_rslt != BME280_INTF_RET_SUCCESS)
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546 rslt = BME280_E_COMM_FAIL;
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551 rslt = BME280_E_INVALID_LEN;
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556 rslt = BME280_E_NULL_PTR;
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563 * @brief This API sets the oversampling, filter and standby duration
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564 * (normal mode) settings in the sensor.
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566 int8_t bme280_set_sensor_settings(uint8_t desired_settings, struct bme280_dev *dev)
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569 uint8_t sensor_mode;
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571 /* Check for null pointer in the device structure*/
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572 rslt = null_ptr_check(dev);
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574 /* Proceed if null check is fine */
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575 if (rslt == BME280_OK)
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577 rslt = bme280_get_sensor_mode(&sensor_mode, dev);
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579 if ((rslt == BME280_OK) && (sensor_mode != BME280_SLEEP_MODE))
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581 rslt = put_device_to_sleep(dev);
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584 if (rslt == BME280_OK)
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586 /* Check if user wants to change oversampling
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589 if (are_settings_changed(OVERSAMPLING_SETTINGS, desired_settings))
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591 rslt = set_osr_settings(desired_settings, &dev->settings, dev);
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594 /* Check if user wants to change filter and/or
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597 if ((rslt == BME280_OK) && are_settings_changed(FILTER_STANDBY_SETTINGS, desired_settings))
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599 rslt = set_filter_standby_settings(desired_settings, &dev->settings, dev);
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608 * @brief This API gets the oversampling, filter and standby duration
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609 * (normal mode) settings from the sensor.
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611 int8_t bme280_get_sensor_settings(struct bme280_dev *dev)
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614 uint8_t reg_data[4];
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616 /* Check for null pointer in the device structure*/
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617 rslt = null_ptr_check(dev);
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619 /* Proceed if null check is fine */
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620 if (rslt == BME280_OK)
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622 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
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624 if (rslt == BME280_OK)
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626 parse_device_settings(reg_data, &dev->settings);
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634 * @brief This API sets the power mode of the sensor.
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636 int8_t bme280_set_sensor_mode(uint8_t sensor_mode, struct bme280_dev *dev)
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639 uint8_t last_set_mode;
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641 /* Check for null pointer in the device structure*/
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642 rslt = null_ptr_check(dev);
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644 if (rslt == BME280_OK)
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646 rslt = bme280_get_sensor_mode(&last_set_mode, dev);
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648 /* If the sensor is not in sleep mode put the device to sleep
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651 if ((rslt == BME280_OK) && (last_set_mode != BME280_SLEEP_MODE))
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653 rslt = put_device_to_sleep(dev);
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656 /* Set the power mode */
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657 if (rslt == BME280_OK)
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659 rslt = write_power_mode(sensor_mode, dev);
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667 * @brief This API gets the power mode of the sensor.
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669 int8_t bme280_get_sensor_mode(uint8_t *sensor_mode, struct bme280_dev *dev)
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673 /* Check for null pointer in the device structure*/
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674 rslt = null_ptr_check(dev);
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676 if ((rslt == BME280_OK) && (sensor_mode != NULL))
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678 /* Read the power mode register */
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679 rslt = bme280_get_regs(BME280_PWR_CTRL_ADDR, sensor_mode, 1, dev);
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681 /* Assign the power mode in the device structure */
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682 *sensor_mode = BME280_GET_BITS_POS_0(*sensor_mode, BME280_SENSOR_MODE);
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686 rslt = BME280_E_NULL_PTR;
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693 * @brief This API performs the soft reset of the sensor.
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695 int8_t bme280_soft_reset(struct bme280_dev *dev)
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698 uint8_t reg_addr = BME280_RESET_ADDR;
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699 uint8_t status_reg = 0;
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700 uint8_t try_run = 5;
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702 /* 0xB6 is the soft reset command */
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703 uint8_t soft_rst_cmd = BME280_SOFT_RESET_COMMAND;
\r
705 /* Check for null pointer in the device structure*/
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706 rslt = null_ptr_check(dev);
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708 /* Proceed if null check is fine */
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709 if (rslt == BME280_OK)
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711 /* Write the soft reset command in the sensor */
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712 rslt = bme280_set_regs(®_addr, &soft_rst_cmd, 1, dev);
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714 if (rslt == BME280_OK)
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716 /* If NVM not copied yet, Wait for NVM to copy */
\r
719 /* As per data sheet - Table 1, startup time is 2 ms. */
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720 dev->delay_us(2000, dev->intf_ptr);
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721 rslt = bme280_get_regs(BME280_STATUS_REG_ADDR, &status_reg, 1, dev);
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723 } while ((rslt == BME280_OK) && (try_run--) && (status_reg & BME280_STATUS_IM_UPDATE));
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725 if (status_reg & BME280_STATUS_IM_UPDATE)
\r
727 rslt = BME280_E_NVM_COPY_FAILED;
\r
736 * @brief This API reads the pressure, temperature and humidity data from the
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737 * sensor, compensates the data and store it in the bme280_data structure
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738 * instance passed by the user.
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740 int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev)
\r
744 /* Array to store the pressure, temperature and humidity data read from
\r
747 uint8_t reg_data[BME280_P_T_H_DATA_LEN] = { 0 };
\r
748 struct bme280_uncomp_data uncomp_data = { 0 };
\r
750 /* Check for null pointer in the device structure*/
\r
751 rslt = null_ptr_check(dev);
\r
753 if ((rslt == BME280_OK) && (comp_data != NULL))
\r
755 /* Read the pressure and temperature data from the sensor */
\r
756 rslt = bme280_get_regs(BME280_DATA_ADDR, reg_data, BME280_P_T_H_DATA_LEN, dev);
\r
758 if (rslt == BME280_OK)
\r
760 /* Parse the read data from the sensor */
\r
761 bme280_parse_sensor_data(reg_data, &uncomp_data);
\r
763 /* Compensate the pressure and/or temperature and/or
\r
764 * humidity data from the sensor
\r
766 rslt = bme280_compensate_data(sensor_comp, &uncomp_data, comp_data, &dev->calib_data);
\r
771 rslt = BME280_E_NULL_PTR;
\r
778 * @brief This API is used to parse the pressure, temperature and
\r
779 * humidity data and store it in the bme280_uncomp_data structure instance.
\r
781 void bme280_parse_sensor_data(const uint8_t *reg_data, struct bme280_uncomp_data *uncomp_data)
\r
783 /* Variables to store the sensor data */
\r
784 uint32_t data_xlsb;
\r
788 /* Store the parsed register values for pressure data */
\r
789 data_msb = (uint32_t)reg_data[0] << 12;
\r
790 data_lsb = (uint32_t)reg_data[1] << 4;
\r
791 data_xlsb = (uint32_t)reg_data[2] >> 4;
\r
792 uncomp_data->pressure = data_msb | data_lsb | data_xlsb;
\r
794 /* Store the parsed register values for temperature data */
\r
795 data_msb = (uint32_t)reg_data[3] << 12;
\r
796 data_lsb = (uint32_t)reg_data[4] << 4;
\r
797 data_xlsb = (uint32_t)reg_data[5] >> 4;
\r
798 uncomp_data->temperature = data_msb | data_lsb | data_xlsb;
\r
800 /* Store the parsed register values for humidity data */
\r
801 data_msb = (uint32_t)reg_data[6] << 8;
\r
802 data_lsb = (uint32_t)reg_data[7];
\r
803 uncomp_data->humidity = data_msb | data_lsb;
\r
807 * @brief This API is used to compensate the pressure and/or
\r
808 * temperature and/or humidity data according to the component selected
\r
811 int8_t bme280_compensate_data(uint8_t sensor_comp,
\r
812 const struct bme280_uncomp_data *uncomp_data,
\r
813 struct bme280_data *comp_data,
\r
814 struct bme280_calib_data *calib_data)
\r
816 int8_t rslt = BME280_OK;
\r
818 if ((uncomp_data != NULL) && (comp_data != NULL) && (calib_data != NULL))
\r
820 /* Initialize to zero */
\r
821 comp_data->temperature = 0;
\r
822 comp_data->pressure = 0;
\r
823 comp_data->humidity = 0;
\r
825 /* If pressure or temperature component is selected */
\r
826 if (sensor_comp & (BME280_PRESS | BME280_TEMP | BME280_HUM))
\r
828 /* Compensate the temperature data */
\r
829 comp_data->temperature = compensate_temperature(uncomp_data, calib_data);
\r
832 if (sensor_comp & BME280_PRESS)
\r
834 /* Compensate the pressure data */
\r
835 comp_data->pressure = compensate_pressure(uncomp_data, calib_data);
\r
838 if (sensor_comp & BME280_HUM)
\r
840 /* Compensate the humidity data */
\r
841 comp_data->humidity = compensate_humidity(uncomp_data, calib_data);
\r
846 rslt = BME280_E_NULL_PTR;
\r
853 * @brief This API is used to calculate the maximum delay in milliseconds required for the
\r
854 * temperature/pressure/humidity(which ever at enabled) measurement to complete.
\r
856 uint32_t bme280_cal_meas_delay(const struct bme280_settings *settings)
\r
858 uint32_t max_delay;
\r
863 /*Array to map OSR config register value to actual OSR */
\r
864 uint8_t osr_sett_to_act_osr[] = { 0, 1, 2, 4, 8, 16 };
\r
866 /* Mapping osr settings to the actual osr values e.g. 0b101 -> osr X16 */
\r
867 if (settings->osr_t <= 5)
\r
869 temp_osr = osr_sett_to_act_osr[settings->osr_t];
\r
876 if (settings->osr_p <= 5)
\r
878 pres_osr = osr_sett_to_act_osr[settings->osr_p];
\r
885 if (settings->osr_h <= 5)
\r
887 hum_osr = osr_sett_to_act_osr[settings->osr_h];
\r
895 (uint32_t)((BME280_MEAS_OFFSET + (BME280_MEAS_DUR * temp_osr) +
\r
896 ((BME280_MEAS_DUR * pres_osr) + BME280_PRES_HUM_MEAS_OFFSET) +
\r
897 ((BME280_MEAS_DUR * hum_osr) + BME280_PRES_HUM_MEAS_OFFSET)) / BME280_MEAS_SCALING_FACTOR);
\r
903 * @brief This internal API sets the oversampling settings for pressure,
\r
904 * temperature and humidity in the sensor.
\r
906 static int8_t set_osr_settings(uint8_t desired_settings, const struct bme280_settings *settings, struct bme280_dev *dev)
\r
908 int8_t rslt = BME280_W_INVALID_OSR_MACRO;
\r
910 if (desired_settings & BME280_OSR_HUM_SEL)
\r
912 rslt = set_osr_humidity_settings(settings, dev);
\r
915 if (desired_settings & (BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL))
\r
917 rslt = set_osr_press_temp_settings(desired_settings, settings, dev);
\r
924 * @brief This API sets the humidity oversampling settings of the sensor.
\r
926 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, struct bme280_dev *dev)
\r
931 uint8_t reg_addr = BME280_CTRL_HUM_ADDR;
\r
933 ctrl_hum = settings->osr_h & BME280_CTRL_HUM_MSK;
\r
935 /* Write the humidity control value in the register */
\r
936 rslt = bme280_set_regs(®_addr, &ctrl_hum, 1, dev);
\r
938 /* Humidity related changes will be only effective after a
\r
939 * write operation to ctrl_meas register
\r
941 if (rslt == BME280_OK)
\r
943 reg_addr = BME280_CTRL_MEAS_ADDR;
\r
944 rslt = bme280_get_regs(reg_addr, &ctrl_meas, 1, dev);
\r
946 if (rslt == BME280_OK)
\r
948 rslt = bme280_set_regs(®_addr, &ctrl_meas, 1, dev);
\r
956 * @brief This API sets the pressure and/or temperature oversampling settings
\r
957 * in the sensor according to the settings selected by the user.
\r
959 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
\r
960 const struct bme280_settings *settings,
\r
961 struct bme280_dev *dev)
\r
964 uint8_t reg_addr = BME280_CTRL_MEAS_ADDR;
\r
967 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
969 if (rslt == BME280_OK)
\r
971 if (desired_settings & BME280_OSR_PRESS_SEL)
\r
973 fill_osr_press_settings(®_data, settings);
\r
976 if (desired_settings & BME280_OSR_TEMP_SEL)
\r
978 fill_osr_temp_settings(®_data, settings);
\r
981 /* Write the oversampling settings in the register */
\r
982 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
989 * @brief This internal API sets the filter and/or standby duration settings
\r
990 * in the sensor according to the settings selected by the user.
\r
992 static int8_t set_filter_standby_settings(uint8_t desired_settings,
\r
993 const struct bme280_settings *settings,
\r
994 struct bme280_dev *dev)
\r
997 uint8_t reg_addr = BME280_CONFIG_ADDR;
\r
1000 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
1002 if (rslt == BME280_OK)
\r
1004 if (desired_settings & BME280_FILTER_SEL)
\r
1006 fill_filter_settings(®_data, settings);
\r
1009 if (desired_settings & BME280_STANDBY_SEL)
\r
1011 fill_standby_settings(®_data, settings);
\r
1014 /* Write the oversampling settings in the register */
\r
1015 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
1022 * @brief This internal API fills the filter settings provided by the user
\r
1023 * in the data buffer so as to write in the sensor.
\r
1025 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
1027 *reg_data = BME280_SET_BITS(*reg_data, BME280_FILTER, settings->filter);
\r
1031 * @brief This internal API fills the standby duration settings provided by
\r
1032 * the user in the data buffer so as to write in the sensor.
\r
1034 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
1036 *reg_data = BME280_SET_BITS(*reg_data, BME280_STANDBY, settings->standby_time);
\r
1040 * @brief This internal API fills the pressure oversampling settings provided by
\r
1041 * the user in the data buffer so as to write in the sensor.
\r
1043 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
1045 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_PRESS, settings->osr_p);
\r
1049 * @brief This internal API fills the temperature oversampling settings
\r
1050 * provided by the user in the data buffer so as to write in the sensor.
\r
1052 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
1054 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_TEMP, settings->osr_t);
\r
1058 * @brief This internal API parse the oversampling(pressure, temperature
\r
1059 * and humidity), filter and standby duration settings and store in the
\r
1060 * device structure.
\r
1062 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings)
\r
1064 settings->osr_h = BME280_GET_BITS_POS_0(reg_data[0], BME280_CTRL_HUM);
\r
1065 settings->osr_p = BME280_GET_BITS(reg_data[2], BME280_CTRL_PRESS);
\r
1066 settings->osr_t = BME280_GET_BITS(reg_data[2], BME280_CTRL_TEMP);
\r
1067 settings->filter = BME280_GET_BITS(reg_data[3], BME280_FILTER);
\r
1068 settings->standby_time = BME280_GET_BITS(reg_data[3], BME280_STANDBY);
\r
1072 * @brief This internal API writes the power mode in the sensor.
\r
1074 static int8_t write_power_mode(uint8_t sensor_mode, struct bme280_dev *dev)
\r
1077 uint8_t reg_addr = BME280_PWR_CTRL_ADDR;
\r
1079 /* Variable to store the value read from power mode register */
\r
1080 uint8_t sensor_mode_reg_val;
\r
1082 /* Read the power mode register */
\r
1083 rslt = bme280_get_regs(reg_addr, &sensor_mode_reg_val, 1, dev);
\r
1085 /* Set the power mode */
\r
1086 if (rslt == BME280_OK)
\r
1088 sensor_mode_reg_val = BME280_SET_BITS_POS_0(sensor_mode_reg_val, BME280_SENSOR_MODE, sensor_mode);
\r
1090 /* Write the power mode in the register */
\r
1091 rslt = bme280_set_regs(®_addr, &sensor_mode_reg_val, 1, dev);
\r
1098 * @brief This internal API puts the device to sleep mode.
\r
1100 static int8_t put_device_to_sleep(struct bme280_dev *dev)
\r
1103 uint8_t reg_data[4];
\r
1104 struct bme280_settings settings;
\r
1106 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
\r
1108 if (rslt == BME280_OK)
\r
1110 parse_device_settings(reg_data, &settings);
\r
1111 rslt = bme280_soft_reset(dev);
\r
1113 if (rslt == BME280_OK)
\r
1115 rslt = reload_device_settings(&settings, dev);
\r
1123 * @brief This internal API reloads the already existing device settings in
\r
1124 * the sensor after soft reset.
\r
1126 static int8_t reload_device_settings(const struct bme280_settings *settings, struct bme280_dev *dev)
\r
1130 rslt = set_osr_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1132 if (rslt == BME280_OK)
\r
1134 rslt = set_filter_standby_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1140 #ifdef BME280_FLOAT_ENABLE
\r
1143 * @brief This internal API is used to compensate the raw temperature data and
\r
1144 * return the compensated temperature data in double data type.
\r
1146 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data, struct bme280_calib_data *calib_data)
\r
1150 double temperature;
\r
1151 double temperature_min = -40;
\r
1152 double temperature_max = 85;
\r
1154 var1 = ((double)uncomp_data->temperature) / 16384.0 - ((double)calib_data->dig_t1) / 1024.0;
\r
1155 var1 = var1 * ((double)calib_data->dig_t2);
\r
1156 var2 = (((double)uncomp_data->temperature) / 131072.0 - ((double)calib_data->dig_t1) / 8192.0);
\r
1157 var2 = (var2 * var2) * ((double)calib_data->dig_t3);
\r
1158 calib_data->t_fine = (int32_t)(var1 + var2);
\r
1159 temperature = (var1 + var2) / 5120.0;
\r
1161 if (temperature < temperature_min)
\r
1163 temperature = temperature_min;
\r
1165 else if (temperature > temperature_max)
\r
1167 temperature = temperature_max;
\r
1170 return temperature;
\r
1174 * @brief This internal API is used to compensate the raw pressure data and
\r
1175 * return the compensated pressure data in double data type.
\r
1177 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1178 const struct bme280_calib_data *calib_data)
\r
1184 double pressure_min = 30000.0;
\r
1185 double pressure_max = 110000.0;
\r
1187 var1 = ((double)calib_data->t_fine / 2.0) - 64000.0;
\r
1188 var2 = var1 * var1 * ((double)calib_data->dig_p6) / 32768.0;
\r
1189 var2 = var2 + var1 * ((double)calib_data->dig_p5) * 2.0;
\r
1190 var2 = (var2 / 4.0) + (((double)calib_data->dig_p4) * 65536.0);
\r
1191 var3 = ((double)calib_data->dig_p3) * var1 * var1 / 524288.0;
\r
1192 var1 = (var3 + ((double)calib_data->dig_p2) * var1) / 524288.0;
\r
1193 var1 = (1.0 + var1 / 32768.0) * ((double)calib_data->dig_p1);
\r
1195 /* avoid exception caused by division by zero */
\r
1198 pressure = 1048576.0 - (double) uncomp_data->pressure;
\r
1199 pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1;
\r
1200 var1 = ((double)calib_data->dig_p9) * pressure * pressure / 2147483648.0;
\r
1201 var2 = pressure * ((double)calib_data->dig_p8) / 32768.0;
\r
1202 pressure = pressure + (var1 + var2 + ((double)calib_data->dig_p7)) / 16.0;
\r
1204 if (pressure < pressure_min)
\r
1206 pressure = pressure_min;
\r
1208 else if (pressure > pressure_max)
\r
1210 pressure = pressure_max;
\r
1213 else /* Invalid case */
\r
1215 pressure = pressure_min;
\r
1222 * @brief This internal API is used to compensate the raw humidity data and
\r
1223 * return the compensated humidity data in double data type.
\r
1225 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1226 const struct bme280_calib_data *calib_data)
\r
1229 double humidity_min = 0.0;
\r
1230 double humidity_max = 100.0;
\r
1238 var1 = ((double)calib_data->t_fine) - 76800.0;
\r
1239 var2 = (((double)calib_data->dig_h4) * 64.0 + (((double)calib_data->dig_h5) / 16384.0) * var1);
\r
1240 var3 = uncomp_data->humidity - var2;
\r
1241 var4 = ((double)calib_data->dig_h2) / 65536.0;
\r
1242 var5 = (1.0 + (((double)calib_data->dig_h3) / 67108864.0) * var1);
\r
1243 var6 = 1.0 + (((double)calib_data->dig_h6) / 67108864.0) * var1 * var5;
\r
1244 var6 = var3 * var4 * (var5 * var6);
\r
1245 humidity = var6 * (1.0 - ((double)calib_data->dig_h1) * var6 / 524288.0);
\r
1247 if (humidity > humidity_max)
\r
1249 humidity = humidity_max;
\r
1251 else if (humidity < humidity_min)
\r
1253 humidity = humidity_min;
\r
1262 * @brief This internal API is used to compensate the raw temperature data and
\r
1263 * return the compensated temperature data in integer data type.
\r
1265 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
\r
1266 struct bme280_calib_data *calib_data)
\r
1270 int32_t temperature;
\r
1271 int32_t temperature_min = -4000;
\r
1272 int32_t temperature_max = 8500;
\r
1274 var1 = (int32_t)((uncomp_data->temperature / 8) - ((int32_t)calib_data->dig_t1 * 2));
\r
1275 var1 = (var1 * ((int32_t)calib_data->dig_t2)) / 2048;
\r
1276 var2 = (int32_t)((uncomp_data->temperature / 16) - ((int32_t)calib_data->dig_t1));
\r
1277 var2 = (((var2 * var2) / 4096) * ((int32_t)calib_data->dig_t3)) / 16384;
\r
1278 calib_data->t_fine = var1 + var2;
\r
1279 temperature = (calib_data->t_fine * 5 + 128) / 256;
\r
1281 if (temperature < temperature_min)
\r
1283 temperature = temperature_min;
\r
1285 else if (temperature > temperature_max)
\r
1287 temperature = temperature_max;
\r
1290 return temperature;
\r
1292 #ifndef BME280_32BIT_ENABLE /* 64 bit compensation for pressure data */
\r
1295 * @brief This internal API is used to compensate the raw pressure data and
\r
1296 * return the compensated pressure data in integer data type with higher
\r
1299 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1300 const struct bme280_calib_data *calib_data)
\r
1306 uint32_t pressure;
\r
1307 uint32_t pressure_min = 3000000;
\r
1308 uint32_t pressure_max = 11000000;
\r
1310 var1 = ((int64_t)calib_data->t_fine) - 128000;
\r
1311 var2 = var1 * var1 * (int64_t)calib_data->dig_p6;
\r
1312 var2 = var2 + ((var1 * (int64_t)calib_data->dig_p5) * 131072);
\r
1313 var2 = var2 + (((int64_t)calib_data->dig_p4) * 34359738368);
\r
1314 var1 = ((var1 * var1 * (int64_t)calib_data->dig_p3) / 256) + ((var1 * ((int64_t)calib_data->dig_p2) * 4096));
\r
1315 var3 = ((int64_t)1) * 140737488355328;
\r
1316 var1 = (var3 + var1) * ((int64_t)calib_data->dig_p1) / 8589934592;
\r
1318 /* To avoid divide by zero exception */
\r
1321 var4 = 1048576 - uncomp_data->pressure;
\r
1322 var4 = (((var4 * INT64_C(2147483648)) - var2) * 3125) / var1;
\r
1323 var1 = (((int64_t)calib_data->dig_p9) * (var4 / 8192) * (var4 / 8192)) / 33554432;
\r
1324 var2 = (((int64_t)calib_data->dig_p8) * var4) / 524288;
\r
1325 var4 = ((var4 + var1 + var2) / 256) + (((int64_t)calib_data->dig_p7) * 16);
\r
1326 pressure = (uint32_t)(((var4 / 2) * 100) / 128);
\r
1328 if (pressure < pressure_min)
\r
1330 pressure = pressure_min;
\r
1332 else if (pressure > pressure_max)
\r
1334 pressure = pressure_max;
\r
1339 pressure = pressure_min;
\r
1344 #else /* 32 bit compensation for pressure data */
\r
1347 * @brief This internal API is used to compensate the raw pressure data and
\r
1348 * return the compensated pressure data in integer data type.
\r
1350 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1351 const struct bme280_calib_data *calib_data)
\r
1358 uint32_t pressure;
\r
1359 uint32_t pressure_min = 30000;
\r
1360 uint32_t pressure_max = 110000;
\r
1362 var1 = (((int32_t)calib_data->t_fine) / 2) - (int32_t)64000;
\r
1363 var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t)calib_data->dig_p6);
\r
1364 var2 = var2 + ((var1 * ((int32_t)calib_data->dig_p5)) * 2);
\r
1365 var2 = (var2 / 4) + (((int32_t)calib_data->dig_p4) * 65536);
\r
1366 var3 = (calib_data->dig_p3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8;
\r
1367 var4 = (((int32_t)calib_data->dig_p2) * var1) / 2;
\r
1368 var1 = (var3 + var4) / 262144;
\r
1369 var1 = (((32768 + var1)) * ((int32_t)calib_data->dig_p1)) / 32768;
\r
1371 /* avoid exception caused by division by zero */
\r
1374 var5 = (uint32_t)((uint32_t)1048576) - uncomp_data->pressure;
\r
1375 pressure = ((uint32_t)(var5 - (uint32_t)(var2 / 4096))) * 3125;
\r
1377 if (pressure < 0x80000000)
\r
1379 pressure = (pressure << 1) / ((uint32_t)var1);
\r
1383 pressure = (pressure / (uint32_t)var1) * 2;
\r
1386 var1 = (((int32_t)calib_data->dig_p9) * ((int32_t)(((pressure / 8) * (pressure / 8)) / 8192))) / 4096;
\r
1387 var2 = (((int32_t)(pressure / 4)) * ((int32_t)calib_data->dig_p8)) / 8192;
\r
1388 pressure = (uint32_t)((int32_t)pressure + ((var1 + var2 + calib_data->dig_p7) / 16));
\r
1390 if (pressure < pressure_min)
\r
1392 pressure = pressure_min;
\r
1394 else if (pressure > pressure_max)
\r
1396 pressure = pressure_max;
\r
1401 pressure = pressure_min;
\r
1409 * @brief This internal API is used to compensate the raw humidity data and
\r
1410 * return the compensated humidity data in integer data type.
\r
1412 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1413 const struct bme280_calib_data *calib_data)
\r
1420 uint32_t humidity;
\r
1421 uint32_t humidity_max = 102400;
\r
1423 var1 = calib_data->t_fine - ((int32_t)76800);
\r
1424 var2 = (int32_t)(uncomp_data->humidity * 16384);
\r
1425 var3 = (int32_t)(((int32_t)calib_data->dig_h4) * 1048576);
\r
1426 var4 = ((int32_t)calib_data->dig_h5) * var1;
\r
1427 var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
\r
1428 var2 = (var1 * ((int32_t)calib_data->dig_h6)) / 1024;
\r
1429 var3 = (var1 * ((int32_t)calib_data->dig_h3)) / 2048;
\r
1430 var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
\r
1431 var2 = ((var4 * ((int32_t)calib_data->dig_h2)) + 8192) / 16384;
\r
1432 var3 = var5 * var2;
\r
1433 var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
\r
1434 var5 = var3 - ((var4 * ((int32_t)calib_data->dig_h1)) / 16);
\r
1435 var5 = (var5 < 0 ? 0 : var5);
\r
1436 var5 = (var5 > 419430400 ? 419430400 : var5);
\r
1437 humidity = (uint32_t)(var5 / 4096);
\r
1439 if (humidity > humidity_max)
\r
1441 humidity = humidity_max;
\r
1449 * @brief This internal API reads the calibration data from the sensor, parse
\r
1450 * it and store in the device structure.
\r
1452 static int8_t get_calib_data(struct bme280_dev *dev)
\r
1455 uint8_t reg_addr = BME280_TEMP_PRESS_CALIB_DATA_ADDR;
\r
1457 /* Array to store calibration data */
\r
1458 uint8_t calib_data[BME280_TEMP_PRESS_CALIB_DATA_LEN] = { 0 };
\r
1460 /* Read the calibration data from the sensor */
\r
1461 rslt = bme280_get_regs(reg_addr, calib_data, BME280_TEMP_PRESS_CALIB_DATA_LEN, dev);
\r
1463 if (rslt == BME280_OK)
\r
1465 /* Parse temperature and pressure calibration data and store
\r
1466 * it in device structure
\r
1468 parse_temp_press_calib_data(calib_data, dev);
\r
1469 reg_addr = BME280_HUMIDITY_CALIB_DATA_ADDR;
\r
1471 /* Read the humidity calibration data from the sensor */
\r
1472 rslt = bme280_get_regs(reg_addr, calib_data, BME280_HUMIDITY_CALIB_DATA_LEN, dev);
\r
1474 if (rslt == BME280_OK)
\r
1476 /* Parse humidity calibration data and store it in
\r
1477 * device structure
\r
1479 parse_humidity_calib_data(calib_data, dev);
\r
1487 * @brief This internal API interleaves the register address between the
\r
1488 * register data buffer for burst write operation.
\r
1490 static void interleave_reg_addr(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len)
\r
1494 for (index = 1; index < len; index++)
\r
1496 temp_buff[(index * 2) - 1] = reg_addr[index];
\r
1497 temp_buff[index * 2] = reg_data[index];
\r
1502 * @brief This internal API is used to parse the temperature and
\r
1503 * pressure calibration data and store it in device structure.
\r
1505 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1507 struct bme280_calib_data *calib_data = &dev->calib_data;
\r
1509 calib_data->dig_t1 = BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1510 calib_data->dig_t2 = (int16_t)BME280_CONCAT_BYTES(reg_data[3], reg_data[2]);
\r
1511 calib_data->dig_t3 = (int16_t)BME280_CONCAT_BYTES(reg_data[5], reg_data[4]);
\r
1512 calib_data->dig_p1 = BME280_CONCAT_BYTES(reg_data[7], reg_data[6]);
\r
1513 calib_data->dig_p2 = (int16_t)BME280_CONCAT_BYTES(reg_data[9], reg_data[8]);
\r
1514 calib_data->dig_p3 = (int16_t)BME280_CONCAT_BYTES(reg_data[11], reg_data[10]);
\r
1515 calib_data->dig_p4 = (int16_t)BME280_CONCAT_BYTES(reg_data[13], reg_data[12]);
\r
1516 calib_data->dig_p5 = (int16_t)BME280_CONCAT_BYTES(reg_data[15], reg_data[14]);
\r
1517 calib_data->dig_p6 = (int16_t)BME280_CONCAT_BYTES(reg_data[17], reg_data[16]);
\r
1518 calib_data->dig_p7 = (int16_t)BME280_CONCAT_BYTES(reg_data[19], reg_data[18]);
\r
1519 calib_data->dig_p8 = (int16_t)BME280_CONCAT_BYTES(reg_data[21], reg_data[20]);
\r
1520 calib_data->dig_p9 = (int16_t)BME280_CONCAT_BYTES(reg_data[23], reg_data[22]);
\r
1521 calib_data->dig_h1 = reg_data[25];
\r
1525 * @brief This internal API is used to parse the humidity calibration data
\r
1526 * and store it in device structure.
\r
1528 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1530 struct bme280_calib_data *calib_data = &dev->calib_data;
\r
1531 int16_t dig_h4_lsb;
\r
1532 int16_t dig_h4_msb;
\r
1533 int16_t dig_h5_lsb;
\r
1534 int16_t dig_h5_msb;
\r
1536 calib_data->dig_h2 = (int16_t)BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1537 calib_data->dig_h3 = reg_data[2];
\r
1538 dig_h4_msb = (int16_t)(int8_t)reg_data[3] * 16;
\r
1539 dig_h4_lsb = (int16_t)(reg_data[4] & 0x0F);
\r
1540 calib_data->dig_h4 = dig_h4_msb | dig_h4_lsb;
\r
1541 dig_h5_msb = (int16_t)(int8_t)reg_data[5] * 16;
\r
1542 dig_h5_lsb = (int16_t)(reg_data[4] >> 4);
\r
1543 calib_data->dig_h5 = dig_h5_msb | dig_h5_lsb;
\r
1544 calib_data->dig_h6 = (int8_t)reg_data[6];
\r
1548 * @brief This internal API is used to identify the settings which the user
\r
1549 * wants to modify in the sensor.
\r
1551 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings)
\r
1553 uint8_t settings_changed = FALSE;
\r
1555 if (sub_settings & desired_settings)
\r
1557 /* User wants to modify this particular settings */
\r
1558 settings_changed = TRUE;
\r
1562 /* User don't want to modify this particular settings */
\r
1563 settings_changed = FALSE;
\r
1566 return settings_changed;
\r
1570 * @brief This internal API is used to validate the device structure pointer for
\r
1571 * null conditions.
\r
1573 static int8_t null_ptr_check(const struct bme280_dev *dev)
\r
1577 if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_us == NULL))
\r
1579 /* Device structure pointer is not valid */
\r
1580 rslt = BME280_E_NULL_PTR;
\r
1584 /* Device structure is fine */
\r