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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57 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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59 static int8_t put_device_to_sleep(const struct bme280_dev *dev);
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62 * @brief This internal API writes the power mode in the sensor.
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64 * @param[in] dev : Structure instance of bme280_dev.
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65 * @param[in] sensor_mode : Variable which contains the power mode to be set.
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67 * @return Result of API execution status.
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68 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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70 static int8_t write_power_mode(uint8_t sensor_mode, const struct bme280_dev *dev);
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73 * @brief This internal API is used to validate the device pointer for
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76 * @param[in] dev : Structure instance of bme280_dev.
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78 * @return Result of API execution status
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79 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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81 static int8_t null_ptr_check(const struct bme280_dev *dev);
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84 * @brief This internal API interleaves the register address between the
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85 * register data buffer for burst write operation.
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87 * @param[in] reg_addr : Contains the register address array.
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88 * @param[out] temp_buff : Contains the temporary buffer to store the
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89 * register data and register address.
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90 * @param[in] reg_data : Contains the register data to be written in the
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92 * @param[in] len : No of bytes of data to be written for burst write.
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94 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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97 * @brief This internal API reads the calibration data from the sensor, parse
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98 * it and store in the device structure.
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100 * @param[in] dev : Structure instance of bme280_dev.
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102 * @return Result of API execution status
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103 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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105 static int8_t get_calib_data(struct bme280_dev *dev);
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108 * @brief This internal API is used to parse the temperature and
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109 * pressure calibration data and store it in the device structure.
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111 * @param[out] dev : Structure instance of bme280_dev to store the calib data.
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112 * @param[in] reg_data : Contains the calibration data to be parsed.
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114 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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117 * @brief This internal API is used to parse the humidity calibration data
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118 * and store it in 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 calibration data to be parsed.
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123 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev);
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125 #ifdef BME280_FLOAT_ENABLE
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128 * @brief This internal API is used to compensate the raw pressure data and
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129 * return the compensated pressure data in double data type.
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131 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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132 * @param[in] calib_data : Pointer to the calibration data structure.
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134 * @return Compensated pressure data.
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135 * @retval Compensated pressure data in double.
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137 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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138 const struct bme280_calib_data *calib_data);
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141 * @brief This internal API is used to compensate the raw humidity data and
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142 * return the compensated humidity data in double data type.
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144 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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145 * @param[in] calib_data : Pointer to the calibration data structure.
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147 * @return Compensated humidity data.
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148 * @retval Compensated humidity data in double.
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150 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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151 const struct bme280_calib_data *calib_data);
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154 * @brief This internal API is used to compensate the raw temperature data and
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155 * return the compensated temperature data in double data type.
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157 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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158 * @param[in] calib_data : Pointer to calibration data structure.
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160 * @return Compensated temperature data.
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161 * @retval Compensated temperature data in double.
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163 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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164 struct bme280_calib_data *calib_data);
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169 * @brief This internal API is used to compensate the raw temperature data and
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170 * return the compensated temperature data in integer data type.
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172 * @param[in] uncomp_data : Contains the uncompensated temperature data.
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173 * @param[in] calib_data : Pointer to calibration data structure.
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175 * @return Compensated temperature data.
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176 * @retval Compensated temperature data in integer.
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178 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
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179 struct bme280_calib_data *calib_data);
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182 * @brief This internal API is used to compensate the raw pressure data and
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183 * return the compensated pressure data in integer data type.
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185 * @param[in] uncomp_data : Contains the uncompensated pressure data.
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186 * @param[in] calib_data : Pointer to the calibration data structure.
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188 * @return Compensated pressure data.
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189 * @retval Compensated pressure data in integer.
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191 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
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192 const struct bme280_calib_data *calib_data);
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195 * @brief This internal API is used to compensate the raw humidity data and
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196 * return the compensated humidity data in integer data type.
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198 * @param[in] uncomp_data : Contains the uncompensated humidity data.
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199 * @param[in] calib_data : Pointer to the calibration data structure.
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201 * @return Compensated humidity data.
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202 * @retval Compensated humidity data in integer.
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204 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
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205 const struct bme280_calib_data *calib_data);
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210 * @brief This internal API is used to identify the settings which the user
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211 * wants to modify in the sensor.
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213 * @param[in] sub_settings : Contains the settings subset to identify particular
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214 * group of settings which the user is interested to change.
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215 * @param[in] desired_settings : Contains the user specified settings.
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217 * @return Indicates whether user is interested to modify the settings which
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218 * are related to sub_settings.
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219 * @retval True -> User wants to modify this group of settings
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220 * @retval False -> User does not want to modify this group of settings
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222 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings);
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225 * @brief This API sets the humidity oversampling settings of the sensor.
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227 * @param[in] dev : Structure instance of bme280_dev.
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229 * @return Result of API execution status
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230 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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232 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, const struct bme280_dev *dev);
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235 * @brief This internal API sets the oversampling settings for pressure,
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236 * temperature and humidity in the sensor.
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238 * @param[in] desired_settings : Variable used to select the settings which
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240 * @param[in] dev : Structure instance of bme280_dev.
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242 * @return Result of API execution status
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243 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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245 static int8_t set_osr_settings(uint8_t desired_settings,
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246 const struct bme280_settings *settings,
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247 const struct bme280_dev *dev);
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250 * @brief This API sets the pressure and/or temperature oversampling settings
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251 * in the sensor according to the settings selected by the user.
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253 * @param[in] dev : Structure instance of bme280_dev.
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254 * @param[in] desired_settings: variable to select the pressure and/or
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255 * temperature oversampling settings.
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257 * @return Result of API execution status
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258 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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260 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
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261 const struct bme280_settings *settings,
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262 const struct bme280_dev *dev);
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265 * @brief This internal API fills the pressure oversampling settings provided by
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266 * the user in the data buffer so as to write in the sensor.
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268 * @param[in] dev : Structure instance of bme280_dev.
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269 * @param[out] reg_data : Variable which is filled according to the pressure
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270 * oversampling data provided by the user.
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272 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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275 * @brief This internal API fills the temperature oversampling settings provided
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276 * by the user in the data buffer so as to write in the sensor.
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278 * @param[in] dev : Structure instance of bme280_dev.
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279 * @param[out] reg_data : Variable which is filled according to the temperature
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280 * oversampling data provided by the user.
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282 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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285 * @brief This internal API sets the filter and/or standby duration settings
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286 * in the sensor according to the settings selected by the user.
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288 * @param[in] dev : Structure instance of bme280_dev.
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289 * @param[in] desired_settings : variable to select the filter and/or
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290 * standby duration settings.
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292 * @return Result of API execution status
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293 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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295 static int8_t set_filter_standby_settings(uint8_t desired_settings,
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296 const struct bme280_settings *settings,
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297 const struct bme280_dev *dev);
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300 * @brief This internal API fills the filter settings provided by the user
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301 * in the data buffer so as to write in the sensor.
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303 * @param[in] dev : Structure instance of bme280_dev.
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304 * @param[out] reg_data : Variable which is filled according to the filter
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305 * settings data provided by the user.
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307 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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310 * @brief This internal API fills the standby duration settings provided by the
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311 * user in the data buffer so as to write in the sensor.
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313 * @param[in] dev : Structure instance of bme280_dev.
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314 * @param[out] reg_data : Variable which is filled according to the standby
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315 * settings data provided by the user.
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317 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings);
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320 * @brief This internal API parse the oversampling(pressure, temperature
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321 * and humidity), filter and standby duration settings and store in the
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322 * device structure.
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324 * @param[out] dev : Structure instance of bme280_dev.
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325 * @param[in] reg_data : Register data to be parsed.
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327 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings);
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330 * @brief This internal API reloads the already existing device settings in the
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331 * sensor after soft reset.
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333 * @param[in] dev : Structure instance of bme280_dev.
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334 * @param[in] settings : Pointer variable which contains the settings to
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335 * be set in the sensor.
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337 * @return Result of API execution status
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338 * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
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340 static int8_t reload_device_settings(const struct bme280_settings *settings, const struct bme280_dev *dev);
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342 /****************** Global Function Definitions *******************************/
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345 * @brief This API is the entry point.
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346 * It reads the chip-id and calibration data from the sensor.
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348 int8_t bme280_init(struct bme280_dev *dev)
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352 /* chip id read try count */
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353 uint8_t try_count = 5;
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354 uint8_t chip_id = 0;
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356 /* Check for null pointer in the device structure*/
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357 rslt = null_ptr_check(dev);
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359 /* Proceed if null check is fine */
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360 if (rslt == BME280_OK)
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364 /* Read the chip-id of bme280 sensor */
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365 rslt = bme280_get_regs(BME280_CHIP_ID_ADDR, &chip_id, 1, dev);
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367 /* Check for chip id validity */
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368 if ((rslt == BME280_OK) && (chip_id == BME280_CHIP_ID))
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370 dev->chip_id = chip_id;
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372 /* Reset the sensor */
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373 rslt = bme280_soft_reset(dev);
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374 if (rslt == BME280_OK)
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376 /* Read the calibration data */
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377 rslt = get_calib_data(dev);
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382 /* Wait for 1 ms */
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387 /* Chip id check failed */
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390 rslt = BME280_E_DEV_NOT_FOUND;
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398 * @brief This API reads the data from the given register address of the sensor.
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400 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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404 /* Check for null pointer in the device structure*/
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405 rslt = null_ptr_check(dev);
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407 /* Proceed if null check is fine */
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408 if (rslt == BME280_OK)
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410 /* If interface selected is SPI */
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411 if (dev->intf != BME280_I2C_INTF)
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413 reg_addr = reg_addr | 0x80;
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416 /* Read the data */
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417 rslt = dev->read(dev->dev_id, reg_addr, reg_data, len);
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419 /* Check for communication error */
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420 if (rslt != BME280_OK)
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422 rslt = BME280_E_COMM_FAIL;
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430 * @brief This API writes the given data to the register address
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433 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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436 uint8_t temp_buff[20]; /* Typically not to write more than 10 registers */
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443 uint8_t reg_addr_cnt;
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445 /* Check for null pointer in the device structure*/
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446 rslt = null_ptr_check(dev);
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448 /* Check for arguments validity */
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449 if ((rslt == BME280_OK) && (reg_addr != NULL) && (reg_data != NULL))
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453 temp_buff[0] = reg_data[0];
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455 /* If interface selected is SPI */
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456 if (dev->intf != BME280_I2C_INTF)
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458 for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++)
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460 reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
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464 /* Burst write mode */
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467 /* Interleave register address w.r.t data for
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470 interleave_reg_addr(reg_addr, temp_buff, reg_data, len);
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471 temp_len = ((len * 2) - 1);
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477 rslt = dev->write(dev->dev_id, reg_addr[0], temp_buff, temp_len);
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479 /* Check for communication error */
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480 if (rslt != BME280_OK)
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482 rslt = BME280_E_COMM_FAIL;
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487 rslt = BME280_E_INVALID_LEN;
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492 rslt = BME280_E_NULL_PTR;
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499 * @brief This API sets the oversampling, filter and standby duration
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500 * (normal mode) settings in the sensor.
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502 int8_t bme280_set_sensor_settings(uint8_t desired_settings, const struct bme280_dev *dev)
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505 uint8_t sensor_mode;
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507 /* Check for null pointer in the device structure*/
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508 rslt = null_ptr_check(dev);
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510 /* Proceed if null check is fine */
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511 if (rslt == BME280_OK)
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513 rslt = bme280_get_sensor_mode(&sensor_mode, dev);
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514 if ((rslt == BME280_OK) && (sensor_mode != BME280_SLEEP_MODE))
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516 rslt = put_device_to_sleep(dev);
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518 if (rslt == BME280_OK)
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520 /* Check if user wants to change oversampling
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523 if (are_settings_changed(OVERSAMPLING_SETTINGS, desired_settings))
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525 rslt = set_osr_settings(desired_settings, &dev->settings, dev);
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528 /* Check if user wants to change filter and/or
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531 if ((rslt == BME280_OK) && are_settings_changed(FILTER_STANDBY_SETTINGS, desired_settings))
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533 rslt = set_filter_standby_settings(desired_settings, &dev->settings, dev);
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542 * @brief This API gets the oversampling, filter and standby duration
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543 * (normal mode) settings from the sensor.
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545 int8_t bme280_get_sensor_settings(struct bme280_dev *dev)
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548 uint8_t reg_data[4];
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550 /* Check for null pointer in the device structure*/
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551 rslt = null_ptr_check(dev);
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553 /* Proceed if null check is fine */
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554 if (rslt == BME280_OK)
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556 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
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557 if (rslt == BME280_OK)
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559 parse_device_settings(reg_data, &dev->settings);
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567 * @brief This API sets the power mode of the sensor.
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569 int8_t bme280_set_sensor_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
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572 uint8_t last_set_mode;
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574 /* Check for null pointer in the device structure*/
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575 rslt = null_ptr_check(dev);
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576 if (rslt == BME280_OK)
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578 rslt = bme280_get_sensor_mode(&last_set_mode, dev);
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580 /* If the sensor is not in sleep mode put the device to sleep
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583 if ((rslt == BME280_OK) && (last_set_mode != BME280_SLEEP_MODE))
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585 rslt = put_device_to_sleep(dev);
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588 /* Set the power mode */
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589 if (rslt == BME280_OK)
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591 rslt = write_power_mode(sensor_mode, dev);
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599 * @brief This API gets the power mode of the sensor.
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601 int8_t bme280_get_sensor_mode(uint8_t *sensor_mode, const struct bme280_dev *dev)
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605 /* Check for null pointer in the device structure*/
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606 rslt = null_ptr_check(dev);
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607 if (rslt == BME280_OK)
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609 /* Read the power mode register */
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610 rslt = bme280_get_regs(BME280_PWR_CTRL_ADDR, sensor_mode, 1, dev);
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612 /* Assign the power mode in the device structure */
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613 *sensor_mode = BME280_GET_BITS_POS_0(*sensor_mode, BME280_SENSOR_MODE);
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620 * @brief This API performs the soft reset of the sensor.
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622 int8_t bme280_soft_reset(const struct bme280_dev *dev)
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625 uint8_t reg_addr = BME280_RESET_ADDR;
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626 uint8_t status_reg = 0;
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627 uint8_t try_run = 5;
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629 /* 0xB6 is the soft reset command */
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630 uint8_t soft_rst_cmd = BME280_SOFT_RESET_COMMAND;
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632 /* Check for null pointer in the device structure*/
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633 rslt = null_ptr_check(dev);
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635 /* Proceed if null check is fine */
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636 if (rslt == BME280_OK)
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638 /* Write the soft reset command in the sensor */
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639 rslt = bme280_set_regs(®_addr, &soft_rst_cmd, 1, dev);
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641 if (rslt == BME280_OK)
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643 /* If NVM not copied yet, Wait for NVM to copy */
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646 /* As per data sheet - Table 1, startup time is 2 ms. */
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648 rslt = bme280_get_regs(BME280_STATUS_REG_ADDR, &status_reg, 1, dev);
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649 } while ((rslt == BME280_OK) && (try_run--) && (status_reg & BME280_STATUS_IM_UPDATE));
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651 if (status_reg & BME280_STATUS_IM_UPDATE)
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653 rslt = BME280_E_NVM_COPY_FAILED;
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663 * @brief This API reads the pressure, temperature and humidity data from the
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664 * sensor, compensates the data and store it in the bme280_data structure
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665 * instance passed by the user.
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667 int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev)
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671 /* Array to store the pressure, temperature and humidity data read from
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674 uint8_t reg_data[BME280_P_T_H_DATA_LEN] = { 0 };
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675 struct bme280_uncomp_data uncomp_data = { 0 };
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677 /* Check for null pointer in the device structure*/
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678 rslt = null_ptr_check(dev);
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679 if ((rslt == BME280_OK) && (comp_data != NULL))
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681 /* Read the pressure and temperature data from the sensor */
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682 rslt = bme280_get_regs(BME280_DATA_ADDR, reg_data, BME280_P_T_H_DATA_LEN, dev);
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683 if (rslt == BME280_OK)
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685 /* Parse the read data from the sensor */
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686 bme280_parse_sensor_data(reg_data, &uncomp_data);
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688 /* Compensate the pressure and/or temperature and/or
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689 * humidity data from the sensor
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691 rslt = bme280_compensate_data(sensor_comp, &uncomp_data, comp_data, &dev->calib_data);
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696 rslt = BME280_E_NULL_PTR;
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703 * @brief This API is used to parse the pressure, temperature and
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704 * humidity data and store it in the bme280_uncomp_data structure instance.
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706 void bme280_parse_sensor_data(const uint8_t *reg_data, struct bme280_uncomp_data *uncomp_data)
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708 /* Variables to store the sensor data */
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709 uint32_t data_xlsb;
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713 /* Store the parsed register values for pressure data */
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714 data_msb = (uint32_t)reg_data[0] << 12;
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715 data_lsb = (uint32_t)reg_data[1] << 4;
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716 data_xlsb = (uint32_t)reg_data[2] >> 4;
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717 uncomp_data->pressure = data_msb | data_lsb | data_xlsb;
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719 /* Store the parsed register values for temperature data */
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720 data_msb = (uint32_t)reg_data[3] << 12;
\r
721 data_lsb = (uint32_t)reg_data[4] << 4;
\r
722 data_xlsb = (uint32_t)reg_data[5] >> 4;
\r
723 uncomp_data->temperature = data_msb | data_lsb | data_xlsb;
\r
725 /* Store the parsed register values for humidity data */
\r
726 data_msb = (uint32_t)reg_data[6] << 8;
\r
727 data_lsb = (uint32_t)reg_data[7];
\r
728 uncomp_data->humidity = data_msb | data_lsb;
\r
732 * @brief This API is used to compensate the pressure and/or
\r
733 * temperature and/or humidity data according to the component selected
\r
736 int8_t bme280_compensate_data(uint8_t sensor_comp,
\r
737 const struct bme280_uncomp_data *uncomp_data,
\r
738 struct bme280_data *comp_data,
\r
739 struct bme280_calib_data *calib_data)
\r
741 int8_t rslt = BME280_OK;
\r
743 if ((uncomp_data != NULL) && (comp_data != NULL) && (calib_data != NULL))
\r
745 /* Initialize to zero */
\r
746 comp_data->temperature = 0;
\r
747 comp_data->pressure = 0;
\r
748 comp_data->humidity = 0;
\r
750 /* If pressure or temperature component is selected */
\r
751 if (sensor_comp & (BME280_PRESS | BME280_TEMP | BME280_HUM))
\r
753 /* Compensate the temperature data */
\r
754 comp_data->temperature = compensate_temperature(uncomp_data, calib_data);
\r
756 if (sensor_comp & BME280_PRESS)
\r
758 /* Compensate the pressure data */
\r
759 comp_data->pressure = compensate_pressure(uncomp_data, calib_data);
\r
761 if (sensor_comp & BME280_HUM)
\r
763 /* Compensate the humidity data */
\r
764 comp_data->humidity = compensate_humidity(uncomp_data, calib_data);
\r
769 rslt = BME280_E_NULL_PTR;
\r
776 * @brief This API is used to calculate the maximum delay in milliseconds required for the
\r
777 * temperature/pressure/humidity(which ever at enabled) measurement to complete.
\r
779 uint32_t bme280_cal_meas_delay(const struct bme280_settings *settings)
\r
781 uint32_t max_delay;
\r
786 /*Array to map OSR config register value to actual OSR */
\r
787 uint8_t osr_sett_to_act_osr[] = { 0, 1, 2, 4, 8, 16 };
\r
789 /* Mapping osr settings to the actual osr values e.g. 0b101 -> osr X16 */
\r
790 if (settings->osr_t <= 5)
\r
792 temp_osr = osr_sett_to_act_osr[settings->osr_t];
\r
799 if (settings->osr_p <= 5)
\r
801 pres_osr = osr_sett_to_act_osr[settings->osr_p];
\r
808 if (settings->osr_h <= 5)
\r
810 hum_osr = osr_sett_to_act_osr[settings->osr_h];
\r
818 (uint32_t)((BME280_MEAS_OFFSET + (BME280_MEAS_DUR * temp_osr) +
\r
819 ((BME280_MEAS_DUR * pres_osr) + BME280_PRES_HUM_MEAS_OFFSET) +
\r
820 ((BME280_MEAS_DUR * hum_osr) + BME280_PRES_HUM_MEAS_OFFSET)) / BME280_MEAS_SCALING_FACTOR);
\r
826 * @brief This internal API sets the oversampling settings for pressure,
\r
827 * temperature and humidity in the sensor.
\r
829 static int8_t set_osr_settings(uint8_t desired_settings,
\r
830 const struct bme280_settings *settings,
\r
831 const struct bme280_dev *dev)
\r
833 int8_t rslt = BME280_W_INVALID_OSR_MACRO;
\r
835 if (desired_settings & BME280_OSR_HUM_SEL)
\r
837 rslt = set_osr_humidity_settings(settings, dev);
\r
839 if (desired_settings & (BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL))
\r
841 rslt = set_osr_press_temp_settings(desired_settings, settings, dev);
\r
848 * @brief This API sets the humidity oversampling settings of the sensor.
\r
850 static int8_t set_osr_humidity_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
\r
855 uint8_t reg_addr = BME280_CTRL_HUM_ADDR;
\r
857 ctrl_hum = settings->osr_h & BME280_CTRL_HUM_MSK;
\r
859 /* Write the humidity control value in the register */
\r
860 rslt = bme280_set_regs(®_addr, &ctrl_hum, 1, dev);
\r
862 /* Humidity related changes will be only effective after a
\r
863 * write operation to ctrl_meas register
\r
865 if (rslt == BME280_OK)
\r
867 reg_addr = BME280_CTRL_MEAS_ADDR;
\r
868 rslt = bme280_get_regs(reg_addr, &ctrl_meas, 1, dev);
\r
869 if (rslt == BME280_OK)
\r
871 rslt = bme280_set_regs(®_addr, &ctrl_meas, 1, dev);
\r
879 * @brief This API sets the pressure and/or temperature oversampling settings
\r
880 * in the sensor according to the settings selected by the user.
\r
882 static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
\r
883 const struct bme280_settings *settings,
\r
884 const struct bme280_dev *dev)
\r
887 uint8_t reg_addr = BME280_CTRL_MEAS_ADDR;
\r
890 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
891 if (rslt == BME280_OK)
\r
893 if (desired_settings & BME280_OSR_PRESS_SEL)
\r
895 fill_osr_press_settings(®_data, settings);
\r
897 if (desired_settings & BME280_OSR_TEMP_SEL)
\r
899 fill_osr_temp_settings(®_data, settings);
\r
902 /* Write the oversampling settings in the register */
\r
903 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
910 * @brief This internal API sets the filter and/or standby duration settings
\r
911 * in the sensor according to the settings selected by the user.
\r
913 static int8_t set_filter_standby_settings(uint8_t desired_settings,
\r
914 const struct bme280_settings *settings,
\r
915 const struct bme280_dev *dev)
\r
918 uint8_t reg_addr = BME280_CONFIG_ADDR;
\r
921 rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
\r
922 if (rslt == BME280_OK)
\r
924 if (desired_settings & BME280_FILTER_SEL)
\r
926 fill_filter_settings(®_data, settings);
\r
928 if (desired_settings & BME280_STANDBY_SEL)
\r
930 fill_standby_settings(®_data, settings);
\r
933 /* Write the oversampling settings in the register */
\r
934 rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
\r
941 * @brief This internal API fills the filter settings provided by the user
\r
942 * in the data buffer so as to write in the sensor.
\r
944 static void fill_filter_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
946 *reg_data = BME280_SET_BITS(*reg_data, BME280_FILTER, settings->filter);
\r
950 * @brief This internal API fills the standby duration settings provided by
\r
951 * the user in the data buffer so as to write in the sensor.
\r
953 static void fill_standby_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
955 *reg_data = BME280_SET_BITS(*reg_data, BME280_STANDBY, settings->standby_time);
\r
959 * @brief This internal API fills the pressure oversampling settings provided by
\r
960 * the user in the data buffer so as to write in the sensor.
\r
962 static void fill_osr_press_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
964 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_PRESS, settings->osr_p);
\r
968 * @brief This internal API fills the temperature oversampling settings
\r
969 * provided by the user in the data buffer so as to write in the sensor.
\r
971 static void fill_osr_temp_settings(uint8_t *reg_data, const struct bme280_settings *settings)
\r
973 *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_TEMP, settings->osr_t);
\r
977 * @brief This internal API parse the oversampling(pressure, temperature
\r
978 * and humidity), filter and standby duration settings and store in the
\r
979 * device structure.
\r
981 static void parse_device_settings(const uint8_t *reg_data, struct bme280_settings *settings)
\r
983 settings->osr_h = BME280_GET_BITS_POS_0(reg_data[0], BME280_CTRL_HUM);
\r
984 settings->osr_p = BME280_GET_BITS(reg_data[2], BME280_CTRL_PRESS);
\r
985 settings->osr_t = BME280_GET_BITS(reg_data[2], BME280_CTRL_TEMP);
\r
986 settings->filter = BME280_GET_BITS(reg_data[3], BME280_FILTER);
\r
987 settings->standby_time = BME280_GET_BITS(reg_data[3], BME280_STANDBY);
\r
991 * @brief This internal API writes the power mode in the sensor.
\r
993 static int8_t write_power_mode(uint8_t sensor_mode, const struct bme280_dev *dev)
\r
996 uint8_t reg_addr = BME280_PWR_CTRL_ADDR;
\r
998 /* Variable to store the value read from power mode register */
\r
999 uint8_t sensor_mode_reg_val;
\r
1001 /* Read the power mode register */
\r
1002 rslt = bme280_get_regs(reg_addr, &sensor_mode_reg_val, 1, dev);
\r
1004 /* Set the power mode */
\r
1005 if (rslt == BME280_OK)
\r
1007 sensor_mode_reg_val = BME280_SET_BITS_POS_0(sensor_mode_reg_val, BME280_SENSOR_MODE, sensor_mode);
\r
1009 /* Write the power mode in the register */
\r
1010 rslt = bme280_set_regs(®_addr, &sensor_mode_reg_val, 1, dev);
\r
1017 * @brief This internal API puts the device to sleep mode.
\r
1019 static int8_t put_device_to_sleep(const struct bme280_dev *dev)
\r
1022 uint8_t reg_data[4];
\r
1023 struct bme280_settings settings;
\r
1025 rslt = bme280_get_regs(BME280_CTRL_HUM_ADDR, reg_data, 4, dev);
\r
1026 if (rslt == BME280_OK)
\r
1028 parse_device_settings(reg_data, &settings);
\r
1029 rslt = bme280_soft_reset(dev);
\r
1030 if (rslt == BME280_OK)
\r
1032 rslt = reload_device_settings(&settings, dev);
\r
1040 * @brief This internal API reloads the already existing device settings in
\r
1041 * the sensor after soft reset.
\r
1043 static int8_t reload_device_settings(const struct bme280_settings *settings, const struct bme280_dev *dev)
\r
1047 rslt = set_osr_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1048 if (rslt == BME280_OK)
\r
1050 rslt = set_filter_standby_settings(BME280_ALL_SETTINGS_SEL, settings, dev);
\r
1056 #ifdef BME280_FLOAT_ENABLE
\r
1059 * @brief This internal API is used to compensate the raw temperature data and
\r
1060 * return the compensated temperature data in double data type.
\r
1062 static double compensate_temperature(const struct bme280_uncomp_data *uncomp_data, struct bme280_calib_data *calib_data)
\r
1066 double temperature;
\r
1067 double temperature_min = -40;
\r
1068 double temperature_max = 85;
\r
1070 var1 = ((double)uncomp_data->temperature) / 16384.0 - ((double)calib_data->dig_t1) / 1024.0;
\r
1071 var1 = var1 * ((double)calib_data->dig_t2);
\r
1072 var2 = (((double)uncomp_data->temperature) / 131072.0 - ((double)calib_data->dig_t1) / 8192.0);
\r
1073 var2 = (var2 * var2) * ((double)calib_data->dig_t3);
\r
1074 calib_data->t_fine = (int32_t)(var1 + var2);
\r
1075 temperature = (var1 + var2) / 5120.0;
\r
1076 if (temperature < temperature_min)
\r
1078 temperature = temperature_min;
\r
1080 else if (temperature > temperature_max)
\r
1082 temperature = temperature_max;
\r
1085 return temperature;
\r
1089 * @brief This internal API is used to compensate the raw pressure data and
\r
1090 * return the compensated pressure data in double data type.
\r
1092 static double compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1093 const struct bme280_calib_data *calib_data)
\r
1099 double pressure_min = 30000.0;
\r
1100 double pressure_max = 110000.0;
\r
1102 var1 = ((double)calib_data->t_fine / 2.0) - 64000.0;
\r
1103 var2 = var1 * var1 * ((double)calib_data->dig_p6) / 32768.0;
\r
1104 var2 = var2 + var1 * ((double)calib_data->dig_p5) * 2.0;
\r
1105 var2 = (var2 / 4.0) + (((double)calib_data->dig_p4) * 65536.0);
\r
1106 var3 = ((double)calib_data->dig_p3) * var1 * var1 / 524288.0;
\r
1107 var1 = (var3 + ((double)calib_data->dig_p2) * var1) / 524288.0;
\r
1108 var1 = (1.0 + var1 / 32768.0) * ((double)calib_data->dig_p1);
\r
1110 /* avoid exception caused by division by zero */
\r
1113 pressure = 1048576.0 - (double) uncomp_data->pressure;
\r
1114 pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1;
\r
1115 var1 = ((double)calib_data->dig_p9) * pressure * pressure / 2147483648.0;
\r
1116 var2 = pressure * ((double)calib_data->dig_p8) / 32768.0;
\r
1117 pressure = pressure + (var1 + var2 + ((double)calib_data->dig_p7)) / 16.0;
\r
1118 if (pressure < pressure_min)
\r
1120 pressure = pressure_min;
\r
1122 else if (pressure > pressure_max)
\r
1124 pressure = pressure_max;
\r
1127 else /* Invalid case */
\r
1129 pressure = pressure_min;
\r
1136 * @brief This internal API is used to compensate the raw humidity data and
\r
1137 * return the compensated humidity data in double data type.
\r
1139 static double compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1140 const struct bme280_calib_data *calib_data)
\r
1143 double humidity_min = 0.0;
\r
1144 double humidity_max = 100.0;
\r
1152 var1 = ((double)calib_data->t_fine) - 76800.0;
\r
1153 var2 = (((double)calib_data->dig_h4) * 64.0 + (((double)calib_data->dig_h5) / 16384.0) * var1);
\r
1154 var3 = uncomp_data->humidity - var2;
\r
1155 var4 = ((double)calib_data->dig_h2) / 65536.0;
\r
1156 var5 = (1.0 + (((double)calib_data->dig_h3) / 67108864.0) * var1);
\r
1157 var6 = 1.0 + (((double)calib_data->dig_h6) / 67108864.0) * var1 * var5;
\r
1158 var6 = var3 * var4 * (var5 * var6);
\r
1159 humidity = var6 * (1.0 - ((double)calib_data->dig_h1) * var6 / 524288.0);
\r
1161 if (humidity > humidity_max)
\r
1163 humidity = humidity_max;
\r
1165 else if (humidity < humidity_min)
\r
1167 humidity = humidity_min;
\r
1176 * @brief This internal API is used to compensate the raw temperature data and
\r
1177 * return the compensated temperature data in integer data type.
\r
1179 static int32_t compensate_temperature(const struct bme280_uncomp_data *uncomp_data,
\r
1180 struct bme280_calib_data *calib_data)
\r
1184 int32_t temperature;
\r
1185 int32_t temperature_min = -4000;
\r
1186 int32_t temperature_max = 8500;
\r
1188 var1 = (int32_t)((uncomp_data->temperature / 8) - ((int32_t)calib_data->dig_t1 * 2));
\r
1189 var1 = (var1 * ((int32_t)calib_data->dig_t2)) / 2048;
\r
1190 var2 = (int32_t)((uncomp_data->temperature / 16) - ((int32_t)calib_data->dig_t1));
\r
1191 var2 = (((var2 * var2) / 4096) * ((int32_t)calib_data->dig_t3)) / 16384;
\r
1192 calib_data->t_fine = var1 + var2;
\r
1193 temperature = (calib_data->t_fine * 5 + 128) / 256;
\r
1195 if (temperature < temperature_min)
\r
1197 temperature = temperature_min;
\r
1199 else if (temperature > temperature_max)
\r
1201 temperature = temperature_max;
\r
1204 return temperature;
\r
1206 #ifdef BME280_64BIT_ENABLE
\r
1209 * @brief This internal API is used to compensate the raw pressure data and
\r
1210 * return the compensated pressure data in integer data type with higher
\r
1213 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1214 const struct bme280_calib_data *calib_data)
\r
1220 uint32_t pressure;
\r
1221 uint32_t pressure_min = 3000000;
\r
1222 uint32_t pressure_max = 11000000;
\r
1224 var1 = ((int64_t)calib_data->t_fine) - 128000;
\r
1225 var2 = var1 * var1 * (int64_t)calib_data->dig_p6;
\r
1226 var2 = var2 + ((var1 * (int64_t)calib_data->dig_p5) * 131072);
\r
1227 var2 = var2 + (((int64_t)calib_data->dig_p4) * 34359738368);
\r
1228 var1 = ((var1 * var1 * (int64_t)calib_data->dig_p3) / 256) + ((var1 * ((int64_t)calib_data->dig_p2) * 4096));
\r
1229 var3 = ((int64_t)1) * 140737488355328;
\r
1230 var1 = (var3 + var1) * ((int64_t)calib_data->dig_p1) / 8589934592;
\r
1232 /* To avoid divide by zero exception */
\r
1235 var4 = 1048576 - uncomp_data->pressure;
\r
1236 var4 = (((var4 * INT64_C(2147483648)) - var2) * 3125) / var1;
\r
1237 var1 = (((int64_t)calib_data->dig_p9) * (var4 / 8192) * (var4 / 8192)) / 33554432;
\r
1238 var2 = (((int64_t)calib_data->dig_p8) * var4) / 524288;
\r
1239 var4 = ((var4 + var1 + var2) / 256) + (((int64_t)calib_data->dig_p7) * 16);
\r
1240 pressure = (uint32_t)(((var4 / 2) * 100) / 128);
\r
1241 if (pressure < pressure_min)
\r
1243 pressure = pressure_min;
\r
1245 else if (pressure > pressure_max)
\r
1247 pressure = pressure_max;
\r
1252 pressure = pressure_min;
\r
1260 * @brief This internal API is used to compensate the raw pressure data and
\r
1261 * return the compensated pressure data in integer data type.
\r
1263 static uint32_t compensate_pressure(const struct bme280_uncomp_data *uncomp_data,
\r
1264 const struct bme280_calib_data *calib_data)
\r
1271 uint32_t pressure;
\r
1272 uint32_t pressure_min = 30000;
\r
1273 uint32_t pressure_max = 110000;
\r
1275 var1 = (((int32_t)calib_data->t_fine) / 2) - (int32_t)64000;
\r
1276 var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t)calib_data->dig_p6);
\r
1277 var2 = var2 + ((var1 * ((int32_t)calib_data->dig_p5)) * 2);
\r
1278 var2 = (var2 / 4) + (((int32_t)calib_data->dig_p4) * 65536);
\r
1279 var3 = (calib_data->dig_p3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8;
\r
1280 var4 = (((int32_t)calib_data->dig_p2) * var1) / 2;
\r
1281 var1 = (var3 + var4) / 262144;
\r
1282 var1 = (((32768 + var1)) * ((int32_t)calib_data->dig_p1)) / 32768;
\r
1284 /* avoid exception caused by division by zero */
\r
1287 var5 = (uint32_t)((uint32_t)1048576) - uncomp_data->pressure;
\r
1288 pressure = ((uint32_t)(var5 - (uint32_t)(var2 / 4096))) * 3125;
\r
1289 if (pressure < 0x80000000)
\r
1291 pressure = (pressure << 1) / ((uint32_t)var1);
\r
1295 pressure = (pressure / (uint32_t)var1) * 2;
\r
1297 var1 = (((int32_t)calib_data->dig_p9) * ((int32_t)(((pressure / 8) * (pressure / 8)) / 8192))) / 4096;
\r
1298 var2 = (((int32_t)(pressure / 4)) * ((int32_t)calib_data->dig_p8)) / 8192;
\r
1299 pressure = (uint32_t)((int32_t)pressure + ((var1 + var2 + calib_data->dig_p7) / 16));
\r
1300 if (pressure < pressure_min)
\r
1302 pressure = pressure_min;
\r
1304 else if (pressure > pressure_max)
\r
1306 pressure = pressure_max;
\r
1311 pressure = pressure_min;
\r
1319 * @brief This internal API is used to compensate the raw humidity data and
\r
1320 * return the compensated humidity data in integer data type.
\r
1322 static uint32_t compensate_humidity(const struct bme280_uncomp_data *uncomp_data,
\r
1323 const struct bme280_calib_data *calib_data)
\r
1330 uint32_t humidity;
\r
1331 uint32_t humidity_max = 102400;
\r
1333 var1 = calib_data->t_fine - ((int32_t)76800);
\r
1334 var2 = (int32_t)(uncomp_data->humidity * 16384);
\r
1335 var3 = (int32_t)(((int32_t)calib_data->dig_h4) * 1048576);
\r
1336 var4 = ((int32_t)calib_data->dig_h5) * var1;
\r
1337 var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
\r
1338 var2 = (var1 * ((int32_t)calib_data->dig_h6)) / 1024;
\r
1339 var3 = (var1 * ((int32_t)calib_data->dig_h3)) / 2048;
\r
1340 var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
\r
1341 var2 = ((var4 * ((int32_t)calib_data->dig_h2)) + 8192) / 16384;
\r
1342 var3 = var5 * var2;
\r
1343 var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
\r
1344 var5 = var3 - ((var4 * ((int32_t)calib_data->dig_h1)) / 16);
\r
1345 var5 = (var5 < 0 ? 0 : var5);
\r
1346 var5 = (var5 > 419430400 ? 419430400 : var5);
\r
1347 humidity = (uint32_t)(var5 / 4096);
\r
1348 if (humidity > humidity_max)
\r
1350 humidity = humidity_max;
\r
1358 * @brief This internal API reads the calibration data from the sensor, parse
\r
1359 * it and store in the device structure.
\r
1361 static int8_t get_calib_data(struct bme280_dev *dev)
\r
1364 uint8_t reg_addr = BME280_TEMP_PRESS_CALIB_DATA_ADDR;
\r
1366 /* Array to store calibration data */
\r
1367 uint8_t calib_data[BME280_TEMP_PRESS_CALIB_DATA_LEN] = { 0 };
\r
1369 /* Read the calibration data from the sensor */
\r
1370 rslt = bme280_get_regs(reg_addr, calib_data, BME280_TEMP_PRESS_CALIB_DATA_LEN, dev);
\r
1371 if (rslt == BME280_OK)
\r
1373 /* Parse temperature and pressure calibration data and store
\r
1374 * it in device structure
\r
1376 parse_temp_press_calib_data(calib_data, dev);
\r
1377 reg_addr = BME280_HUMIDITY_CALIB_DATA_ADDR;
\r
1379 /* Read the humidity calibration data from the sensor */
\r
1380 rslt = bme280_get_regs(reg_addr, calib_data, BME280_HUMIDITY_CALIB_DATA_LEN, dev);
\r
1381 if (rslt == BME280_OK)
\r
1383 /* Parse humidity calibration data and store it in
\r
1384 * device structure
\r
1386 parse_humidity_calib_data(calib_data, dev);
\r
1394 * @brief This internal API interleaves the register address between the
\r
1395 * register data buffer for burst write operation.
\r
1397 static void interleave_reg_addr(const uint8_t *reg_addr, uint8_t *temp_buff, const uint8_t *reg_data, uint8_t len)
\r
1401 for (index = 1; index < len; index++)
\r
1403 temp_buff[(index * 2) - 1] = reg_addr[index];
\r
1404 temp_buff[index * 2] = reg_data[index];
\r
1409 * @brief This internal API is used to parse the temperature and
\r
1410 * pressure calibration data and store it in device structure.
\r
1412 static void parse_temp_press_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1414 struct bme280_calib_data *calib_data = &dev->calib_data;
\r
1416 calib_data->dig_t1 = BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1417 calib_data->dig_t2 = (int16_t)BME280_CONCAT_BYTES(reg_data[3], reg_data[2]);
\r
1418 calib_data->dig_t3 = (int16_t)BME280_CONCAT_BYTES(reg_data[5], reg_data[4]);
\r
1419 calib_data->dig_p1 = BME280_CONCAT_BYTES(reg_data[7], reg_data[6]);
\r
1420 calib_data->dig_p2 = (int16_t)BME280_CONCAT_BYTES(reg_data[9], reg_data[8]);
\r
1421 calib_data->dig_p3 = (int16_t)BME280_CONCAT_BYTES(reg_data[11], reg_data[10]);
\r
1422 calib_data->dig_p4 = (int16_t)BME280_CONCAT_BYTES(reg_data[13], reg_data[12]);
\r
1423 calib_data->dig_p5 = (int16_t)BME280_CONCAT_BYTES(reg_data[15], reg_data[14]);
\r
1424 calib_data->dig_p6 = (int16_t)BME280_CONCAT_BYTES(reg_data[17], reg_data[16]);
\r
1425 calib_data->dig_p7 = (int16_t)BME280_CONCAT_BYTES(reg_data[19], reg_data[18]);
\r
1426 calib_data->dig_p8 = (int16_t)BME280_CONCAT_BYTES(reg_data[21], reg_data[20]);
\r
1427 calib_data->dig_p9 = (int16_t)BME280_CONCAT_BYTES(reg_data[23], reg_data[22]);
\r
1428 calib_data->dig_h1 = reg_data[25];
\r
1432 * @brief This internal API is used to parse the humidity calibration data
\r
1433 * and store it in device structure.
\r
1435 static void parse_humidity_calib_data(const uint8_t *reg_data, struct bme280_dev *dev)
\r
1437 struct bme280_calib_data *calib_data = &dev->calib_data;
\r
1438 int16_t dig_h4_lsb;
\r
1439 int16_t dig_h4_msb;
\r
1440 int16_t dig_h5_lsb;
\r
1441 int16_t dig_h5_msb;
\r
1443 calib_data->dig_h2 = (int16_t)BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
\r
1444 calib_data->dig_h3 = reg_data[2];
\r
1445 dig_h4_msb = (int16_t)(int8_t)reg_data[3] * 16;
\r
1446 dig_h4_lsb = (int16_t)(reg_data[4] & 0x0F);
\r
1447 calib_data->dig_h4 = dig_h4_msb | dig_h4_lsb;
\r
1448 dig_h5_msb = (int16_t)(int8_t)reg_data[5] * 16;
\r
1449 dig_h5_lsb = (int16_t)(reg_data[4] >> 4);
\r
1450 calib_data->dig_h5 = dig_h5_msb | dig_h5_lsb;
\r
1451 calib_data->dig_h6 = (int8_t)reg_data[6];
\r
1455 * @brief This internal API is used to identify the settings which the user
\r
1456 * wants to modify in the sensor.
\r
1458 static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings)
\r
1460 uint8_t settings_changed = FALSE;
\r
1462 if (sub_settings & desired_settings)
\r
1464 /* User wants to modify this particular settings */
\r
1465 settings_changed = TRUE;
\r
1469 /* User don't want to modify this particular settings */
\r
1470 settings_changed = FALSE;
\r
1473 return settings_changed;
\r
1477 * @brief This internal API is used to validate the device structure pointer for
\r
1478 * null conditions.
\r
1480 static int8_t null_ptr_check(const struct bme280_dev *dev)
\r
1484 if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL))
\r
1486 /* Device structure pointer is not valid */
\r
1487 rslt = BME280_E_NULL_PTR;
\r
1491 /* Device structure is fine */
\r