2 * Copyright (C) 2018 - 2019 Bosch Sensortec GmbH
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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7 * Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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10 * Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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14 * Neither the name of the copyright holder nor the names of the
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15 * contributors may be used to endorse or promote products derived from
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16 * this software without specific prior written permission.
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 * DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
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23 * OR CONTRIBUTORS BE LIABLE FOR ANY
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24 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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25 * OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
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26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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31 * ANY WAY OUT OF THE USE OF THIS
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32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
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34 * The information provided is believed to be accurate and reliable.
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35 * The copyright holder assumes no responsibility
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36 * for the consequences of use
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37 * of such information nor for any infringement of patents or
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38 * other rights of third parties which may result from its use.
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39 * No license is granted by implication or otherwise under any patent or
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40 * patent rights of the copyright holder.
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49 * @brief Sensor driver for BME280 sensor
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53 /**\name Internal macros */
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54 /* To identify osr settings selected by user */
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55 #define OVERSAMPLING_SETTINGS UINT8_C(0x07)
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57 /* To identify filter and standby settings selected by user */
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58 #define FILTER_STANDBY_SETTINGS UINT8_C(0x18)
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61 * @brief This internal API puts the device to sleep mode.
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63 * @param[in] dev : Structure instance of bme280_dev.
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65 * @return Result of API execution status.
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66 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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68 static int8_t put_device_to_sleep(const struct bme280_dev *dev);
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71 * @brief This internal API writes the power mode in the sensor.
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73 * @param[in] dev : Structure instance of bme280_dev.
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74 * @param[in] sensor_mode : Variable which contains the power mode to be set.
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76 * @return Result of API execution status.
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77 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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79 static int8_t write_power_mode(uint8_t sensor_mode, const struct bme280_dev *dev);
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82 * @brief This internal API is used to validate the device pointer for
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85 * @param[in] dev : Structure instance of bme280_dev.
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87 * @return Result of API execution status
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88 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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90 static int8_t null_ptr_check(const struct bme280_dev *dev);
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93 * @brief This internal API interleaves the register address between the
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94 * register data buffer for burst write operation.
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96 * @param[in] reg_addr : Contains the register address array.
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97 * @param[out] temp_buff : Contains the temporary buffer to store the
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98 * register data and register address.
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99 * @param[in] reg_data : Contains the register data to be written in the
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100 * temporary buffer.
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101 * @param[in] len : No of bytes of data to be written for burst write.
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103 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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106 * @brief This internal API reads the calibration data from the sensor, parse
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107 * it and store in the device structure.
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109 * @param[in] dev : Structure instance of bme280_dev.
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111 * @return Result of API execution status
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112 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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114 static int8_t get_calib_data(struct bme280_dev *dev);
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117 * @brief This internal API is used to parse the temperature and
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118 * pressure calibration data and store it in the device structure.
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120 * @param[out] dev : Structure instance of bme280_dev to store the calib data.
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121 * @param[in] reg_data : Contains the calibration data to be parsed.
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123 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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126 * @brief This internal API is used to parse the humidity calibration data
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127 * and store it in device structure.
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129 * @param[out] dev : Structure instance of bme280_dev to store the calib data.
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130 * @param[in] reg_data : Contains calibration data to be parsed.
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132 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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134 #ifdef BME280_FLOAT_ENABLE
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137 * @brief This internal API is used to compensate the raw pressure data and
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138 * return the compensated pressure data in double data type.
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140 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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141 * @param[in] calib_data : Pointer to the calibration data structure.
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143 * @return Compensated pressure data.
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144 * @retval Compensated pressure data in double.
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146 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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147 const struct bme280_calib_data *calib_data);
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150 * @brief This internal API is used to compensate the raw humidity data and
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151 * return the compensated humidity data in double data type.
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153 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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154 * @param[in] calib_data : Pointer to the calibration data structure.
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156 * @return Compensated humidity data.
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157 * @retval Compensated humidity data in double.
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159 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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160 const struct bme280_calib_data *calib_data);
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163 * @brief This internal API is used to compensate the raw temperature data and
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164 * return the compensated temperature data in double data type.
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166 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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167 * @param[in] calib_data : Pointer to calibration data structure.
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169 * @return Compensated temperature data.
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170 * @retval Compensated temperature data in double.
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172 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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173 struct bme280_calib_data *calib_data);
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178 * @brief This internal API is used to compensate the raw temperature data and
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179 * return the compensated temperature data in integer data type.
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181 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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182 * @param[in] calib_data : Pointer to calibration data structure.
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184 * @return Compensated temperature data.
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185 * @retval Compensated temperature data in integer.
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187 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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188 struct bme280_calib_data *calib_data);
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191 * @brief This internal API is used to compensate the raw pressure data and
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192 * return the compensated pressure data in integer data type.
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194 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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195 * @param[in] calib_data : Pointer to the calibration data structure.
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197 * @return Compensated pressure data.
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198 * @retval Compensated pressure data in integer.
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200 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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201 const struct bme280_calib_data *calib_data);
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204 * @brief This internal API is used to compensate the raw humidity data and
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205 * return the compensated humidity data in integer data type.
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207 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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208 * @param[in] calib_data : Pointer to the calibration data structure.
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210 * @return Compensated humidity data.
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211 * @retval Compensated humidity data in integer.
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213 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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214 const struct bme280_calib_data *calib_data);
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219 * @brief This internal API is used to identify the settings which the user
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220 * wants to modify in the sensor.
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222 * @param[in] sub_settings : Contains the settings subset to identify particular
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223 * group of settings which the user is interested to change.
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224 * @param[in] desired_settings : Contains the user specified settings.
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226 * @return Indicates whether user is interested to modify the settings which
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227 * are related to sub_settings.
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228 * @retval True -> User wants to modify this group of settings
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229 * @retval False -> User does not want to modify this group of settings
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231 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings);
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234 * @brief This API sets the humidity oversampling settings of the sensor.
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236 * @param[in] dev : Structure instance of bme280_dev.
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238 * @return Result of API execution status
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239 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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241 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, const struct bme280_dev *dev);
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244 * @brief This internal API sets the oversampling settings for pressure,
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245 * temperature and humidity in the sensor.
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247 * @param[in] desired_settings : Variable used to select the settings which
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249 * @param[in] dev : Structure instance of bme280_dev.
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251 * @return Result of API execution status
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252 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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254 static int8_t set_osr_settings(uint8_t desired_settings,
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255 const struct bme280_settings *settings,
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256 const struct bme280_dev *dev);
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259 * @brief This API sets the pressure and/or temperature oversampling settings
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260 * in the sensor according to the settings selected by the user.
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262 * @param[in] dev : Structure instance of bme280_dev.
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263 * @param[in] desired_settings: variable to select the pressure and/or
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264 * temperature oversampling settings.
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266 * @return Result of API execution status
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267 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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269 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
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270 const struct bme280_settings *settings,
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271 const struct bme280_dev *dev);
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274 * @brief This internal API fills the pressure oversampling settings provided by
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275 * the user in the data buffer so as to write in the sensor.
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277 * @param[in] dev : Structure instance of bme280_dev.
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278 * @param[out] reg_data : Variable which is filled according to the pressure
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279 * oversampling data provided by the user.
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281 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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284 * @brief This internal API fills the temperature oversampling settings provided
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285 * by the user in the data buffer so as to write in the sensor.
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287 * @param[in] dev : Structure instance of bme280_dev.
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288 * @param[out] reg_data : Variable which is filled according to the temperature
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289 * oversampling data provided by the user.
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291 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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294 * @brief This internal API sets the filter and/or standby duration settings
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295 * in the sensor according to the settings selected by the user.
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297 * @param[in] dev : Structure instance of bme280_dev.
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298 * @param[in] desired_settings : variable to select the filter and/or
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299 * standby duration settings.
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301 * @return Result of API execution status
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302 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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304 static int8_t set_filter_standby_settings(uint8_t desired_settings,
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305 const struct bme280_settings *settings,
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306 const struct bme280_dev *dev);
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309 * @brief This internal API fills the filter settings provided by the user
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310 * in the data buffer so as to write in the sensor.
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312 * @param[in] dev : Structure instance of bme280_dev.
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313 * @param[out] reg_data : Variable which is filled according to the filter
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314 * settings data provided by the user.
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316 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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319 * @brief This internal API fills the standby duration settings provided by the
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320 * user in the data buffer so as to write in the sensor.
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322 * @param[in] dev : Structure instance of bme280_dev.
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323 * @param[out] reg_data : Variable which is filled according to the standby
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324 * settings data provided by the user.
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326 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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329 * @brief This internal API parse the oversampling(pressure, temperature
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330 * and humidity), filter and standby duration settings and store in the
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331 * device structure.
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333 * @param[out] dev : Structure instance of bme280_dev.
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334 * @param[in] reg_data : Register data to be parsed.
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336 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings);
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339 * @brief This internal API reloads the already existing device settings in the
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340 * sensor after soft reset.
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342 * @param[in] dev : Structure instance of bme280_dev.
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343 * @param[in] settings : Pointer variable which contains the settings to
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344 * be set in the sensor.
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346 * @return Result of API execution status
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347 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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349 static int8_t reload_device_settings(const struct bme280_settings *settings, const struct bme280_dev *dev);
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351 /****************** Global Function Definitions *******************************/
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354 * @brief This API is the entry point.
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355 * It reads the chip-id and calibration data from the sensor.
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357 int8_t bme280_init(struct bme280_dev *dev)
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361 /* chip id read try count */
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362 uint8_t try_count = 5;
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363 uint8_t chip_id = 0;
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365 /* Check for null pointer in the device structure*/
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366 rslt = null_ptr_check(dev);
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368 /* Proceed if null check is fine */
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369 if (rslt == BME280_OK)
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373 /* Read the chip-id of bme280 sensor */
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374 rslt = bme280_get_regs(BME280_CHIP_ID_ADDR, &chip_id, 1, dev);
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376 /* Check for chip id validity */
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377 if ((rslt == BME280_OK) && (chip_id == BME280_CHIP_ID))
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379 dev->chip_id = chip_id;
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381 /* Reset the sensor */
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382 rslt = bme280_soft_reset(dev);
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383 if (rslt == BME280_OK)
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385 /* Read the calibration data */
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386 rslt = get_calib_data(dev);
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391 /* Wait for 1 ms */
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396 /* Chip id check failed */
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399 rslt = BME280_E_DEV_NOT_FOUND;
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407 * @brief This API reads the data from the given register address of the sensor.
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409 int8_t bme280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, const struct bme280_dev *dev)
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413 /* Check for null pointer in the device structure*/
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414 rslt = null_ptr_check(dev);
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416 /* Proceed if null check is fine */
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417 if (rslt == BME280_OK)
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419 /* If interface selected is SPI */
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420 if (dev->intf != BME280_I2C_INTF)
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422 reg_addr = reg_addr | 0x80;
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425 /* Read the data */
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426 rslt = dev->read(dev->dev_id, reg_addr, reg_data, len);
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428 /* Check for communication error */
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429 if (rslt != BME280_OK)
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431 rslt = BME280_E_COMM_FAIL;
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439 * @brief This API writes the given data to the register address
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442 int8_t bme280_set_regs(uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, const struct bme280_dev *dev)
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445 uint8_t temp_buff[20]; /* Typically not to write more than 10 registers */
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452 uint8_t reg_addr_cnt;
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454 /* Check for null pointer in the device structure*/
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455 rslt = null_ptr_check(dev);
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457 /* Check for arguments validity */
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458 if ((rslt == BME280_OK) && (reg_addr != NULL) && (reg_data != NULL))
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462 temp_buff[0] = reg_data[0];
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464 /* If interface selected is SPI */
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465 if (dev->intf != BME280_I2C_INTF)
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467 for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++)
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469 reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
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473 /* Burst write mode */
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476 /* Interleave register address w.r.t data for
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479 interleave_reg_addr(reg_addr, temp_buff, reg_data, len);
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480 temp_len = ((len * 2) - 1);
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486 rslt = dev->write(dev->dev_id, reg_addr[0], temp_buff, temp_len);
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488 /* Check for communication error */
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489 if (rslt != BME280_OK)
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491 rslt = BME280_E_COMM_FAIL;
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496 rslt = BME280_E_INVALID_LEN;
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501 rslt = BME280_E_NULL_PTR;
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508 * @brief This API sets the oversampling, filter and standby duration
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509 * (normal mode) settings in the sensor.
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511 int8_t bme280_set_sensor_settings(uint8_t desired_settings, const struct bme280_dev *dev)
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514 uint8_t sensor_mode;
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516 /* Check for null pointer in the device structure*/
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517 rslt = null_ptr_check(dev);
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519 /* Proceed if null check is fine */
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520 if (rslt == BME280_OK)
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522 rslt = bme280_get_sensor_mode(&sensor_mode, dev);
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523 if ((rslt == BME280_OK) && (sensor_mode != BME280_SLEEP_MODE))
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525 rslt = put_device_to_sleep(dev);
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527 if (rslt == BME280_OK)
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529 /* Check if user wants to change oversampling
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532 if (are_settings_changed(OVERSAMPLING_SETTINGS, desired_settings))
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534 rslt = set_osr_settings(desired_settings, &dev->settings, dev);
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537 /* Check if user wants to change filter and/or
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540 if ((rslt == BME280_OK) && are_settings_changed(FILTER_STANDBY_SETTINGS, desired_settings))
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542 rslt = set_filter_standby_settings(desired_settings, &dev->settings, dev);
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551 * @brief This API gets the oversampling, filter and standby duration
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552 * (normal mode) settings from the sensor.
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554 int8_t bme280_get_sensor_settings(struct bme280_dev *dev)
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557 uint8_t reg_data[4];
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559 /* Check for null pointer in the device structure*/
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560 rslt = null_ptr_check(dev);
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562 /* Proceed if null check is fine */
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563 if (rslt == BME280_OK)
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565 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
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566 if (rslt == BME280_OK)
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568 parse_device_settings(reg_data, &dev->settings);
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576 * @brief This API sets the power mode of the sensor.
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578 int8_t bme280_set_sensor_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
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581 uint8_t last_set_mode;
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583 /* Check for null pointer in the device structure*/
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584 rslt = null_ptr_check(dev);
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585 if (rslt == BME280_OK)
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587 rslt = bme280_get_sensor_mode(&last_set_mode, dev);
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589 /* If the sensor is not in sleep mode put the device to sleep
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592 if ((rslt == BME280_OK) && (last_set_mode != BME280_SLEEP_MODE))
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594 rslt = put_device_to_sleep(dev);
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597 /* Set the power mode */
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598 if (rslt == BME280_OK)
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600 rslt = write_power_mode(sensor_mode, dev);
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608 * @brief This API gets the power mode of the sensor.
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610 int8_t bme280_get_sensor_mode(uint8_t *sensor_mode, const struct bme280_dev *dev)
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614 /* Check for null pointer in the device structure*/
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615 rslt = null_ptr_check(dev);
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616 if (rslt == BME280_OK)
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618 /* Read the power mode register */
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619 rslt = bme280_get_regs(BME280_PWR_CTRL_ADDR, sensor_mode, 1, dev);
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621 /* Assign the power mode in the device structure */
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622 *sensor_mode = BME280_GET_BITS_POS_0(*sensor_mode, BME280_SENSOR_MODE);
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629 * @brief This API performs the soft reset of the sensor.
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631 int8_t bme280_soft_reset(const struct bme280_dev *dev)
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634 uint8_t reg_addr = BME280_RESET_ADDR;
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635 uint8_t status_reg = 0;
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636 uint8_t try_run = 5;
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638 /* 0xB6 is the soft reset command */
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639 uint8_t soft_rst_cmd = BME280_SOFT_RESET_COMMAND;
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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 /* Proceed if null check is fine */
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645 if (rslt == BME280_OK)
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647 /* Write the soft reset command in the sensor */
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648 rslt = bme280_set_regs(®_addr, &soft_rst_cmd, 1, dev);
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650 if (rslt == BME280_OK)
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652 /* If NVM not copied yet, Wait for NVM to copy */
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655 /* As per data sheet - Table 1, startup time is 2 ms. */
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657 rslt = bme280_get_regs(BME280_STATUS_REG_ADDR, &status_reg, 1, dev);
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658 } while ((rslt == BME280_OK) && (try_run--) && (status_reg & BME280_STATUS_IM_UPDATE));
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660 if (status_reg & BME280_STATUS_IM_UPDATE)
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662 rslt = BME280_E_NVM_COPY_FAILED;
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672 * @brief This API reads the pressure, temperature and humidity data from the
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673 * sensor, compensates the data and store it in the bme280_data structure
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674 * instance passed by the user.
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676 int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev)
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680 /* Array to store the pressure, temperature and humidity data read from
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683 uint8_t reg_data[BME280_P_T_H_DATA_LEN] = { 0 };
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684 struct bme280_uncomp_data uncomp_data = { 0 };
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686 /* Check for null pointer in the device structure*/
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687 rslt = null_ptr_check(dev);
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688 if ((rslt == BME280_OK) && (comp_data != NULL))
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690 /* Read the pressure and temperature data from the sensor */
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691 rslt = bme280_get_regs(BME280_DATA_ADDR, reg_data, BME280_P_T_H_DATA_LEN, dev);
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692 if (rslt == BME280_OK)
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694 /* Parse the read data from the sensor */
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695 bme280_parse_sensor_data(reg_data, &uncomp_data);
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697 /* Compensate the pressure and/or temperature and/or
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698 * humidity data from the sensor
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700 rslt = bme280_compensate_data(sensor_comp, &uncomp_data, comp_data, &dev->calib_data);
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705 rslt = BME280_E_NULL_PTR;
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712 * @brief This API is used to parse the pressure, temperature and
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713 * humidity data and store it in the bme280_uncomp_data structure instance.
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715 void bme280_parse_sensor_data(const uint8_t *reg_data, struct bme280_uncomp_data *uncomp_data)
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717 /* Variables to store the sensor data */
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718 uint32_t data_xlsb;
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722 /* Store the parsed register values for pressure data */
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723 data_msb = (uint32_t)reg_data[0] << 12;
\r
724 data_lsb = (uint32_t)reg_data[1] << 4;
\r
725 data_xlsb = (uint32_t)reg_data[2] >> 4;
\r
726 uncomp_data->pressure = data_msb | data_lsb | data_xlsb;
\r
728 /* Store the parsed register values for temperature data */
\r
729 data_msb = (uint32_t)reg_data[3] << 12;
\r
730 data_lsb = (uint32_t)reg_data[4] << 4;
\r
731 data_xlsb = (uint32_t)reg_data[5] >> 4;
\r
732 uncomp_data->temperature = data_msb | data_lsb | data_xlsb;
\r
734 /* Store the parsed register values for temperature data */
\r
735 data_lsb = (uint32_t)reg_data[6] << 8;
\r
736 data_msb = (uint32_t)reg_data[7];
\r
737 uncomp_data->humidity = data_msb | data_lsb;
\r
741 * @brief This API is used to compensate the pressure and/or
\r
742 * temperature and/or humidity data according to the component selected
\r
745 int8_t bme280_compensate_data(uint8_t sensor_comp,
\r
746 const struct bme280_uncomp_data *uncomp_data,
\r
747 struct bme280_data *comp_data,
\r
748 struct bme280_calib_data *calib_data)
\r
750 int8_t rslt = BME280_OK;
\r
752 if ((uncomp_data != NULL) && (comp_data != NULL) && (calib_data != NULL))
\r
754 /* Initialize to zero */
\r
755 comp_data->temperature = 0;
\r
756 comp_data->pressure = 0;
\r
757 comp_data->humidity = 0;
\r
759 /* If pressure or temperature component is selected */
\r
760 if (sensor_comp & (BME280_PRESS | BME280_TEMP | BME280_HUM))
\r
762 /* Compensate the temperature data */
\r
763 comp_data->temperature = compensate_temperature(uncomp_data, calib_data);
\r
765 if (sensor_comp & BME280_PRESS)
\r
767 /* Compensate the pressure data */
\r
768 comp_data->pressure = compensate_pressure(uncomp_data, calib_data);
\r
770 if (sensor_comp & BME280_HUM)
\r
772 /* Compensate the humidity data */
\r
773 comp_data->humidity = compensate_humidity(uncomp_data, calib_data);
\r
778 rslt = BME280_E_NULL_PTR;
\r
785 * @brief This internal API sets the oversampling settings for pressure,
\r
786 * temperature and humidity in the sensor.
\r
788 static int8_t set_osr_settings(uint8_t desired_settings,
\r
789 const struct bme280_settings *settings,
\r
790 const struct bme280_dev *dev)
\r
792 int8_t rslt = BME280_W_INVALID_OSR_MACRO;
\r
794 if (desired_settings & BME280_OSR_HUM_SEL)
\r
796 rslt = set_osr_humidity_settings(settings, dev);
\r
798 if (desired_settings & (BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL))
\r
800 rslt = set_osr_press_temp_settings(desired_settings, settings, dev);
\r
807 * @brief This API sets the humidity oversampling settings of the sensor.
\r
809 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
\r
814 uint8_t reg_addr = BME280_CTRL_HUM_ADDR;
\r
816 ctrl_hum = settings->osr_h & BME280_CTRL_HUM_MSK;
\r
818 /* Write the humidity control value in the register */
\r
819 rslt = bme280_set_regs(®_addr, &ctrl_hum, 1, dev);
\r
821 /* Humidity related changes will be only effective after a
\r
822 * write operation to ctrl_meas register
\r
824 if (rslt == BME280_OK)
\r
826 reg_addr = BME280_CTRL_MEAS_ADDR;
\r
827 rslt = bme280_get_regs(reg_addr, &ctrl_meas, 1, dev);
\r
828 if (rslt == BME280_OK)
\r
830 rslt = bme280_set_regs(®_addr, &ctrl_meas, 1, dev);
\r
838 * @brief This API sets the pressure and/or temperature oversampling settings
\r
839 * in the sensor according to the settings selected by the user.
\r
841 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
\r
842 const struct bme280_settings *settings,
\r
843 const struct bme280_dev *dev)
\r
846 uint8_t reg_addr = BME280_CTRL_MEAS_ADDR;
\r
849 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
850 if (rslt == BME280_OK)
\r
852 if (desired_settings & BME280_OSR_PRESS_SEL)
\r
854 fill_osr_press_settings(®_data, settings);
\r
856 if (desired_settings & BME280_OSR_TEMP_SEL)
\r
858 fill_osr_temp_settings(®_data, settings);
\r
861 /* Write the oversampling settings in the register */
\r
862 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
869 * @brief This internal API sets the filter and/or standby duration settings
\r
870 * in the sensor according to the settings selected by the user.
\r
872 static int8_t set_filter_standby_settings(uint8_t desired_settings,
\r
873 const struct bme280_settings *settings,
\r
874 const struct bme280_dev *dev)
\r
877 uint8_t reg_addr = BME280_CONFIG_ADDR;
\r
880 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
881 if (rslt == BME280_OK)
\r
883 if (desired_settings & BME280_FILTER_SEL)
\r
885 fill_filter_settings(®_data, settings);
\r
887 if (desired_settings & BME280_STANDBY_SEL)
\r
889 fill_standby_settings(®_data, settings);
\r
892 /* Write the oversampling settings in the register */
\r
893 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
900 * @brief This internal API fills the filter settings provided by the user
\r
901 * in the data buffer so as to write in the sensor.
\r
903 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
905 *reg_data = BME280_SET_BITS(*reg_data, BME280_FILTER, settings->filter);
\r
909 * @brief This internal API fills the standby duration settings provided by
\r
910 * the user in the data buffer so as to write in the sensor.
\r
912 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
914 *reg_data = BME280_SET_BITS(*reg_data, BME280_STANDBY, settings->standby_time);
\r
918 * @brief This internal API fills the pressure oversampling settings provided by
\r
919 * the user in the data buffer so as to write in the sensor.
\r
921 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
923 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_PRESS, settings->osr_p);
\r
927 * @brief This internal API fills the temperature oversampling settings
\r
928 * provided by the user in the data buffer so as to write in the sensor.
\r
930 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
932 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_TEMP, settings->osr_t);
\r
936 * @brief This internal API parse the oversampling(pressure, temperature
\r
937 * and humidity), filter and standby duration settings and store in the
\r
938 * device structure.
\r
940 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings)
\r
942 settings->osr_h = BME280_GET_BITS_POS_0(reg_data[0], BME280_CTRL_HUM);
\r
943 settings->osr_p = BME280_GET_BITS(reg_data[2], BME280_CTRL_PRESS);
\r
944 settings->osr_t = BME280_GET_BITS(reg_data[2], BME280_CTRL_TEMP);
\r
945 settings->filter = BME280_GET_BITS(reg_data[3], BME280_FILTER);
\r
946 settings->standby_time = BME280_GET_BITS(reg_data[3], BME280_STANDBY);
\r
950 * @brief This internal API writes the power mode in the sensor.
\r
952 static int8_t write_power_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
\r
955 uint8_t reg_addr = BME280_PWR_CTRL_ADDR;
\r
957 /* Variable to store the value read from power mode register */
\r
958 uint8_t sensor_mode_reg_val;
\r
960 /* Read the power mode register */
\r
961 rslt = bme280_get_regs(reg_addr, &sensor_mode_reg_val, 1, dev);
\r
963 /* Set the power mode */
\r
964 if (rslt == BME280_OK)
\r
966 sensor_mode_reg_val = BME280_SET_BITS_POS_0(sensor_mode_reg_val, BME280_SENSOR_MODE, sensor_mode);
\r
968 /* Write the power mode in the register */
\r
969 rslt = bme280_set_regs(®_addr, &sensor_mode_reg_val, 1, dev);
\r
976 * @brief This internal API puts the device to sleep mode.
\r
978 static int8_t put_device_to_sleep(const struct bme280_dev *dev)
\r
981 uint8_t reg_data[4];
\r
982 struct bme280_settings settings;
\r
984 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
\r
985 if (rslt == BME280_OK)
\r
987 parse_device_settings(reg_data, &settings);
\r
988 rslt = bme280_soft_reset(dev);
\r
989 if (rslt == BME280_OK)
\r
991 rslt = reload_device_settings(&settings, dev);
\r
999 * @brief This internal API reloads the already existing device settings in
\r
1000 * the sensor after soft reset.
\r
1002 static int8_t reload_device_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
\r
1006 rslt = set_osr_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1007 if (rslt == BME280_OK)
\r
1009 rslt = set_filter_standby_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1015 #ifdef BME280_FLOAT_ENABLE
\r
1018 * @brief This internal API is used to compensate the raw temperature data and
\r
1019 * return the compensated temperature data in double data type.
\r
1021 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data, struct bme280_calib_data *calib_data)
\r
1025 double temperature;
\r
1026 double temperature_min = -40;
\r
1027 double temperature_max = 85;
\r
1029 var1 = ((double)uncomp_data->temperature) / 16384.0 - ((double)calib_data->dig_T1) / 1024.0;
\r
1030 var1 = var1 * ((double)calib_data->dig_T2);
\r
1031 var2 = (((double)uncomp_data->temperature) / 131072.0 - ((double)calib_data->dig_T1) / 8192.0);
\r
1032 var2 = (var2 * var2) * ((double)calib_data->dig_T3);
\r
1033 calib_data->t_fine = (int32_t)(var1 + var2);
\r
1034 temperature = (var1 + var2) / 5120.0;
\r
1035 if (temperature < temperature_min)
\r
1037 temperature = temperature_min;
\r
1039 else if (temperature > temperature_max)
\r
1041 temperature = temperature_max;
\r
1044 return temperature;
\r
1048 * @brief This internal API is used to compensate the raw pressure data and
\r
1049 * return the compensated pressure data in double data type.
\r
1051 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1052 const struct bme280_calib_data *calib_data)
\r
1058 double pressure_min = 30000.0;
\r
1059 double pressure_max = 110000.0;
\r
1061 var1 = ((double)calib_data->t_fine / 2.0) - 64000.0;
\r
1062 var2 = var1 * var1 * ((double)calib_data->dig_P6) / 32768.0;
\r
1063 var2 = var2 + var1 * ((double)calib_data->dig_P5) * 2.0;
\r
1064 var2 = (var2 / 4.0) + (((double)calib_data->dig_P4) * 65536.0);
\r
1065 var3 = ((double)calib_data->dig_P3) * var1 * var1 / 524288.0;
\r
1066 var1 = (var3 + ((double)calib_data->dig_P2) * var1) / 524288.0;
\r
1067 var1 = (1.0 + var1 / 32768.0) * ((double)calib_data->dig_P1);
\r
1069 /* avoid exception caused by division by zero */
\r
1072 pressure = 1048576.0 - (double) uncomp_data->pressure;
\r
1073 pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1;
\r
1074 var1 = ((double)calib_data->dig_P9) * pressure * pressure / 2147483648.0;
\r
1075 var2 = pressure * ((double)calib_data->dig_P8) / 32768.0;
\r
1076 pressure = pressure + (var1 + var2 + ((double)calib_data->dig_P7)) / 16.0;
\r
1077 if (pressure < pressure_min)
\r
1079 pressure = pressure_min;
\r
1081 else if (pressure > pressure_max)
\r
1083 pressure = pressure_max;
\r
1086 else /* Invalid case */
\r
1088 pressure = pressure_min;
\r
1095 * @brief This internal API is used to compensate the raw humidity data and
\r
1096 * return the compensated humidity data in double data type.
\r
1098 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1099 const struct bme280_calib_data *calib_data)
\r
1102 double humidity_min = 0.0;
\r
1103 double humidity_max = 100.0;
\r
1111 var1 = ((double)calib_data->t_fine) - 76800.0;
\r
1112 var2 = (((double)calib_data->dig_H4) * 64.0 + (((double)calib_data->dig_H5) / 16384.0) * var1);
\r
1113 var3 = uncomp_data->humidity - var2;
\r
1114 var4 = ((double)calib_data->dig_H2) / 65536.0;
\r
1115 var5 = (1.0 + (((double)calib_data->dig_H3) / 67108864.0) * var1);
\r
1116 var6 = 1.0 + (((double)calib_data->dig_H6) / 67108864.0) * var1 * var5;
\r
1117 var6 = var3 * var4 * (var5 * var6);
\r
1118 humidity = var6 * (1.0 - ((double)calib_data->dig_H1) * var6 / 524288.0);
\r
1119 if (humidity > humidity_max)
\r
1121 humidity = humidity_max;
\r
1123 else if (humidity < humidity_min)
\r
1125 humidity = humidity_min;
\r
1134 * @brief This internal API is used to compensate the raw temperature data and
\r
1135 * return the compensated temperature data in integer data type.
\r
1137 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
\r
1138 struct bme280_calib_data *calib_data)
\r
1142 int32_t temperature;
\r
1143 int32_t temperature_min = -4000;
\r
1144 int32_t temperature_max = 8500;
\r
1146 var1 = (int32_t)((uncomp_data->temperature / 8) - ((int32_t)calib_data->dig_T1 * 2));
\r
1147 var1 = (var1 * ((int32_t)calib_data->dig_T2)) / 2048;
\r
1148 var2 = (int32_t)((uncomp_data->temperature / 16) - ((int32_t)calib_data->dig_T1));
\r
1149 var2 = (((var2 * var2) / 4096) * ((int32_t)calib_data->dig_T3)) / 16384;
\r
1150 calib_data->t_fine = var1 + var2;
\r
1151 temperature = (calib_data->t_fine * 5 + 128) / 256;
\r
1152 if (temperature < temperature_min)
\r
1154 temperature = temperature_min;
\r
1156 else if (temperature > temperature_max)
\r
1158 temperature = temperature_max;
\r
1161 return temperature;
\r
1163 #ifdef BME280_64BIT_ENABLE
\r
1166 * @brief This internal API is used to compensate the raw pressure data and
\r
1167 * return the compensated pressure data in integer data type with higher
\r
1170 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1171 const struct bme280_calib_data *calib_data)
\r
1177 uint32_t pressure;
\r
1178 uint32_t pressure_min = 3000000;
\r
1179 uint32_t pressure_max = 11000000;
\r
1181 var1 = ((int64_t)calib_data->t_fine) - 128000;
\r
1182 var2 = var1 * var1 * (int64_t)calib_data->dig_P6;
\r
1183 var2 = var2 + ((var1 * (int64_t)calib_data->dig_P5) * 131072);
\r
1184 var2 = var2 + (((int64_t)calib_data->dig_P4) * 34359738368);
\r
1185 var1 = ((var1 * var1 * (int64_t)calib_data->dig_P3) / 256) + ((var1 * ((int64_t)calib_data->dig_P2) * 4096));
\r
1186 var3 = ((int64_t)1) * 140737488355328;
\r
1187 var1 = (var3 + var1) * ((int64_t)calib_data->dig_P1) / 8589934592;
\r
1189 /* To avoid divide by zero exception */
\r
1192 var4 = 1048576 - uncomp_data->pressure;
\r
1193 var4 = (((var4 * INT64_C(2147483648)) - var2) * 3125) / var1;
\r
1194 var1 = (((int64_t)calib_data->dig_P9) * (var4 / 8192) * (var4 / 8192)) / 33554432;
\r
1195 var2 = (((int64_t)calib_data->dig_P8) * var4) / 524288;
\r
1196 var4 = ((var4 + var1 + var2) / 256) + (((int64_t)calib_data->dig_P7) * 16);
\r
1197 pressure = (uint32_t)(((var4 / 2) * 100) / 128);
\r
1198 if (pressure < pressure_min)
\r
1200 pressure = pressure_min;
\r
1202 else if (pressure > pressure_max)
\r
1204 pressure = pressure_max;
\r
1209 pressure = pressure_min;
\r
1217 * @brief This internal API is used to compensate the raw pressure data and
\r
1218 * return the compensated pressure data in integer data type.
\r
1220 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1221 const struct bme280_calib_data *calib_data)
\r
1228 uint32_t pressure;
\r
1229 uint32_t pressure_min = 30000;
\r
1230 uint32_t pressure_max = 110000;
\r
1232 var1 = (((int32_t)calib_data->t_fine) / 2) - (int32_t)64000;
\r
1233 var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t)calib_data->dig_P6);
\r
1234 var2 = var2 + ((var1 * ((int32_t)calib_data->dig_P5)) * 2);
\r
1235 var2 = (var2 / 4) + (((int32_t)calib_data->dig_P4) * 65536);
\r
1236 var3 = (calib_data->dig_P3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8;
\r
1237 var4 = (((int32_t)calib_data->dig_P2) * var1) / 2;
\r
1238 var1 = (var3 + var4) / 262144;
\r
1239 var1 = (((32768 + var1)) * ((int32_t)calib_data->dig_P1)) / 32768;
\r
1241 /* avoid exception caused by division by zero */
\r
1244 var5 = (uint32_t)((uint32_t)1048576) - uncomp_data->pressure;
\r
1245 pressure = ((uint32_t)(var5 - (uint32_t)(var2 / 4096))) * 3125;
\r
1246 if (pressure < 0x80000000)
\r
1248 pressure = (pressure << 1) / ((uint32_t)var1);
\r
1252 pressure = (pressure / (uint32_t)var1) * 2;
\r
1254 var1 = (((int32_t)calib_data->dig_P9) * ((int32_t)(((pressure / 8) * (pressure / 8)) / 8192))) / 4096;
\r
1255 var2 = (((int32_t)(pressure / 4)) * ((int32_t)calib_data->dig_P8)) / 8192;
\r
1256 pressure = (uint32_t)((int32_t)pressure + ((var1 + var2 + calib_data->dig_P7) / 16));
\r
1257 if (pressure < pressure_min)
\r
1259 pressure = pressure_min;
\r
1261 else if (pressure > pressure_max)
\r
1263 pressure = pressure_max;
\r
1268 pressure = pressure_min;
\r
1276 * @brief This internal API is used to compensate the raw humidity data and
\r
1277 * return the compensated humidity data in integer data type.
\r
1279 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1280 const struct bme280_calib_data *calib_data)
\r
1287 uint32_t humidity;
\r
1288 uint32_t humidity_max = 102400;
\r
1290 var1 = calib_data->t_fine - ((int32_t)76800);
\r
1291 var2 = (int32_t)(uncomp_data->humidity * 16384);
\r
1292 var3 = (int32_t)(((int32_t)calib_data->dig_H4) * 1048576);
\r
1293 var4 = ((int32_t)calib_data->dig_H5) * var1;
\r
1294 var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
\r
1295 var2 = (var1 * ((int32_t)calib_data->dig_H6)) / 1024;
\r
1296 var3 = (var1 * ((int32_t)calib_data->dig_H3)) / 2048;
\r
1297 var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
\r
1298 var2 = ((var4 * ((int32_t)calib_data->dig_H2)) + 8192) / 16384;
\r
1299 var3 = var5 * var2;
\r
1300 var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
\r
1301 var5 = var3 - ((var4 * ((int32_t)calib_data->dig_H1)) / 16);
\r
1302 var5 = (var5 < 0 ? 0 : var5);
\r
1303 var5 = (var5 > 419430400 ? 419430400 : var5);
\r
1304 humidity = (uint32_t)(var5 / 4096);
\r
1305 if (humidity > humidity_max)
\r
1307 humidity = humidity_max;
\r
1315 * @brief This internal API reads the calibration data from the sensor, parse
\r
1316 * it and store in the device structure.
\r
1318 static int8_t get_calib_data(struct bme280_dev *dev)
\r
1321 uint8_t reg_addr = BME280_TEMP_PRESS_CALIB_DATA_ADDR;
\r
1323 /* Array to store calibration data */
\r
1324 uint8_t calib_data[BME280_TEMP_PRESS_CALIB_DATA_LEN] = { 0 };
\r
1326 /* Read the calibration data from the sensor */
\r
1327 rslt = bme280_get_regs(reg_addr, calib_data, BME280_TEMP_PRESS_CALIB_DATA_LEN, dev);
\r
1328 if (rslt == BME280_OK)
\r
1330 /* Parse temperature and pressure calibration data and store
\r
1331 * it in device structure
\r
1333 parse_temp_press_calib_data(calib_data, dev);
\r
1334 reg_addr = BME280_HUMIDITY_CALIB_DATA_ADDR;
\r
1336 /* Read the humidity calibration data from the sensor */
\r
1337 rslt = bme280_get_regs(reg_addr, calib_data, BME280_HUMIDITY_CALIB_DATA_LEN, dev);
\r
1338 if (rslt == BME280_OK)
\r
1340 /* Parse humidity calibration data and store it in
\r
1341 * device structure
\r
1343 parse_humidity_calib_data(calib_data, dev);
\r
1351 * @brief This internal API interleaves the register address between the
\r
1352 * register data buffer for burst write operation.
\r
1354 static void interleave_reg_addr(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len)
\r
1358 for (index = 1; index < len; index++)
\r
1360 temp_buff[(index * 2) - 1] = reg_addr[index];
\r
1361 temp_buff[index * 2] = reg_data[index];
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1366 * @brief This internal API is used to parse the temperature and
\r
1367 * pressure calibration data and store it in device structure.
\r
1369 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1371 struct bme280_calib_data *calib_data = &dev->calib_data;
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1373 calib_data->dig_T1 = BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1374 calib_data->dig_T2 = (int16_t)BME280_CONCAT_BYTES(reg_data[3], reg_data[2]);
\r
1375 calib_data->dig_T3 = (int16_t)BME280_CONCAT_BYTES(reg_data[5], reg_data[4]);
\r
1376 calib_data->dig_P1 = BME280_CONCAT_BYTES(reg_data[7], reg_data[6]);
\r
1377 calib_data->dig_P2 = (int16_t)BME280_CONCAT_BYTES(reg_data[9], reg_data[8]);
\r
1378 calib_data->dig_P3 = (int16_t)BME280_CONCAT_BYTES(reg_data[11], reg_data[10]);
\r
1379 calib_data->dig_P4 = (int16_t)BME280_CONCAT_BYTES(reg_data[13], reg_data[12]);
\r
1380 calib_data->dig_P5 = (int16_t)BME280_CONCAT_BYTES(reg_data[15], reg_data[14]);
\r
1381 calib_data->dig_P6 = (int16_t)BME280_CONCAT_BYTES(reg_data[17], reg_data[16]);
\r
1382 calib_data->dig_P7 = (int16_t)BME280_CONCAT_BYTES(reg_data[19], reg_data[18]);
\r
1383 calib_data->dig_P8 = (int16_t)BME280_CONCAT_BYTES(reg_data[21], reg_data[20]);
\r
1384 calib_data->dig_P9 = (int16_t)BME280_CONCAT_BYTES(reg_data[23], reg_data[22]);
\r
1385 calib_data->dig_H1 = reg_data[25];
\r
1389 * @brief This internal API is used to parse the humidity calibration data
\r
1390 * and store it in device structure.
\r
1392 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1394 struct bme280_calib_data *calib_data = &dev->calib_data;
\r
1395 int16_t dig_H4_lsb;
\r
1396 int16_t dig_H4_msb;
\r
1397 int16_t dig_H5_lsb;
\r
1398 int16_t dig_H5_msb;
\r
1400 calib_data->dig_H2 = (int16_t)BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1401 calib_data->dig_H3 = reg_data[2];
\r
1402 dig_H4_msb = (int16_t)(int8_t)reg_data[3] * 16;
\r
1403 dig_H4_lsb = (int16_t)(reg_data[4] & 0x0F);
\r
1404 calib_data->dig_H4 = dig_H4_msb | dig_H4_lsb;
\r
1405 dig_H5_msb = (int16_t)(int8_t)reg_data[5] * 16;
\r
1406 dig_H5_lsb = (int16_t)(reg_data[4] >> 4);
\r
1407 calib_data->dig_H5 = dig_H5_msb | dig_H5_lsb;
\r
1408 calib_data->dig_H6 = (int8_t)reg_data[6];
\r
1412 * @brief This internal API is used to identify the settings which the user
\r
1413 * wants to modify in the sensor.
\r
1415 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings)
\r
1417 uint8_t settings_changed = FALSE;
\r
1419 if (sub_settings & desired_settings)
\r
1421 /* User wants to modify this particular settings */
\r
1422 settings_changed = TRUE;
\r
1426 /* User don't want to modify this particular settings */
\r
1427 settings_changed = FALSE;
\r
1430 return settings_changed;
\r
1434 * @brief This internal API is used to validate the device structure pointer for
\r
1435 * null conditions.
\r
1437 static int8_t null_ptr_check(const struct bme280_dev *dev)
\r
1441 if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL))
\r
1443 /* Device structure pointer is not valid */
\r
1444 rslt = BME280_E_NULL_PTR;
\r
1448 /* Device structure is fine */
\r