diff --git a/examples/bme280/Makefile b/examples/bme280/Makefile
new file mode 100644
index 000000000..57796c958
--- /dev/null
+++ b/examples/bme280/Makefile
@@ -0,0 +1,14 @@
+# Makefile for user application
+
+# Specify this directory relative to the current application.
+TOCK_USERLAND_BASE_DIR = ../..
+
+# Which files to compile.
+C_SRCS := $(wildcard *.c)
+
+# Include userland master makefile. Contains rules and flags for actually
+# building the application.
+
+override CFLAGS += -DBME280_32BIT_ENABLE
+
+include $(TOCK_USERLAND_BASE_DIR)/AppMakefile.mk
\ No newline at end of file
diff --git a/examples/bme280/README.md b/examples/bme280/README.md
new file mode 100644
index 000000000..5beecf91c
--- /dev/null
+++ b/examples/bme280/README.md
@@ -0,0 +1,8 @@
+Blink App
+=========
+
+The canonical "blink" app for an embedded platform. This app will
+blink all of the LEDs that are registered with the kernel.
+
+To learn more, please see the
+[Blink an LED](https://book.tockos.org/tutorials/01_running_blink) tutorial.
diff --git a/examples/bme280/bme280.c b/examples/bme280/bme280.c
new file mode 100644
index 000000000..8d6af6dbd
--- /dev/null
+++ b/examples/bme280/bme280.c
@@ -0,0 +1,1422 @@
+/**
+ * Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
+ *
+ * BSD-3-Clause
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file bme280.c
+ * @date 2020-12-17
+ * @version v3.5.1
+ *
+ */
+
+/*! @file bme280.c
+ * @brief Sensor driver for BME280 sensor
+ */
+#include "bme280.h"
+
+/**\name Internal macros */
+/* To identify osr settings selected by user */
+#define OVERSAMPLING_SETTINGS UINT8_C(0x07)
+
+/* To identify filter and standby settings selected by user */
+#define FILTER_STANDBY_SETTINGS UINT8_C(0x18)
+
+/*!
+ * @brief This internal API puts the device to sleep mode.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t put_device_to_sleep(struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API writes the power mode in the sensor.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ * @param[in] sensor_mode : Variable which contains the power mode to be set.
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t write_power_mode(uint8_t sensor_mode, struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API is used to validate the device pointer for
+ * null conditions.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t null_ptr_check(const struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API interleaves the register address between the
+ * register data buffer for burst write operation.
+ *
+ * @param[in] reg_addr : Contains the register address array.
+ * @param[out] temp_buff : Contains the temporary buffer to store the
+ * register data and register address.
+ * @param[in] reg_data : Contains the register data to be written in the
+ * temporary buffer.
+ * @param[in] len : No of bytes of data to be written for burst write.
+ *
+ */
+static void interleave_reg_addr(const uint8_t* reg_addr, uint8_t* temp_buff, const uint8_t* reg_data, uint32_t len);
+
+/*!
+ * @brief This internal API reads the calibration data from the sensor, parse
+ * it and store in the device structure.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t get_calib_data(struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API is used to parse the temperature and
+ * pressure calibration data and store it in the device structure.
+ *
+ * @param[out] dev : Structure instance of bme280_dev to store the calib data.
+ * @param[in] reg_data : Contains the calibration data to be parsed.
+ *
+ */
+static void parse_temp_press_calib_data(const uint8_t* reg_data, struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API is used to parse the humidity calibration data
+ * and store it in device structure.
+ *
+ * @param[out] dev : Structure instance of bme280_dev to store the calib data.
+ * @param[in] reg_data : Contains calibration data to be parsed.
+ *
+ */
+static void parse_humidity_calib_data(const uint8_t* reg_data, struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API is used to identify the settings which the user
+ * wants to modify in the sensor.
+ *
+ * @param[in] sub_settings : Contains the settings subset to identify particular
+ * group of settings which the user is interested to change.
+ * @param[in] desired_settings : Contains the user specified settings.
+ *
+ * @return Indicates whether user is interested to modify the settings which
+ * are related to sub_settings.
+ * @return True -> User wants to modify this group of settings
+ * @return False -> User does not want to modify this group of settings
+ *
+ */
+static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings);
+
+/*!
+ * @brief This API sets the humidity over sampling settings of the sensor.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t set_osr_humidity_settings(const struct bme280_settings* settings, struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API sets the oversampling settings for pressure,
+ * temperature and humidity in the sensor.
+ *
+ * @param[in] desired_settings : Variable used to select the settings which
+ * are to be set.
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t set_osr_settings(uint8_t desired_settings, const struct bme280_settings* settings,
+ struct bme280_dev* dev);
+
+/*!
+ * @brief This API sets the pressure and/or temperature oversampling settings
+ * in the sensor according to the settings selected by the user.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ * @param[in] desired_settings: variable to select the pressure and/or
+ * temperature oversampling settings.
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
+ const struct bme280_settings* settings,
+ struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API fills the pressure oversampling settings provided by
+ * the user in the data buffer so as to write in the sensor.
+ *
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[out] reg_data : Variable which is filled according to the pressure
+ * oversampling data provided by the user.
+ *
+ */
+static void fill_osr_press_settings(uint8_t* reg_data, const struct bme280_settings* settings);
+
+/*!
+ * @brief This internal API fills the temperature oversampling settings provided
+ * by the user in the data buffer so as to write in the sensor.
+ *
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[out] reg_data : Variable which is filled according to the temperature
+ * oversampling data provided by the user.
+ *
+ */
+static void fill_osr_temp_settings(uint8_t* reg_data, const struct bme280_settings* settings);
+
+/*!
+ * @brief This internal API sets the filter and/or standby duration settings
+ * in the sensor according to the settings selected by the user.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[in] settings : Structure instance of bme280_settings.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t set_filter_standby_settings(uint8_t desired_settings,
+ const struct bme280_settings* settings,
+ struct bme280_dev* dev);
+
+/*!
+ * @brief This internal API fills the filter settings provided by the user
+ * in the data buffer so as to write in the sensor.
+ *
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[out] reg_data : Variable which is filled according to the filter
+ * settings data provided by the user.
+ *
+ */
+static void fill_filter_settings(uint8_t* reg_data, const struct bme280_settings* settings);
+
+/*!
+ * @brief This internal API fills the standby duration settings provided by the
+ * user in the data buffer so as to write in the sensor.
+ *
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ * @param[out] reg_data : Variable which is filled according to the standby
+ * settings data provided by the user.
+ *
+ */
+static void fill_standby_settings(uint8_t* reg_data, const struct bme280_settings* settings);
+
+/*!
+ * @brief This internal API parse the oversampling(pressure, temperature
+ * and humidity), filter and standby duration settings and store in the
+ * device structure.
+ *
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be get in the sensor.
+ * @param[in] reg_data : Register data to be parsed.
+ *
+ */
+static void parse_device_settings(const uint8_t* reg_data, struct bme280_settings* settings);
+
+/*!
+ * @brief This API is used to parse the pressure, temperature and
+ * humidity data and store it in the bme280_uncomp_data structure instance.
+ *
+ * @param[in] reg_data : Contains register data which needs to be parsed
+ * @param[out] uncomp_data : Contains the uncompensated pressure, temperature and humidity data
+ */
+static void parse_sensor_data(const uint8_t* reg_data, struct bme280_uncomp_data* uncomp_data);
+
+/*!
+ * @brief This internal API reloads the already existing device settings in the
+ * sensor after soft reset.
+ *
+ * @param[in] dev : Structure instance of bme280_dev.
+ * @param[in] settings : Pointer variable which contains the settings to
+ * be set in the sensor.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+static int8_t reload_device_settings(const struct bme280_settings* settings, struct bme280_dev* dev);
+
+#ifdef BME280_DOUBLE_ENABLE
+
+/*!
+ * @brief This internal API is used to compensate the raw pressure data and
+ * return the compensated pressure data in double data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated pressure data.
+ * @param[in] calib_data : Pointer to the calibration data structure.
+ *
+ * @return Compensated pressure data in double.
+ *
+ */
+static double compensate_pressure(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data);
+
+/*!
+ * @brief This internal API is used to compensate the raw humidity data and
+ * return the compensated humidity data in double data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated humidity data.
+ * @param[in] calib_data : Pointer to the calibration data structure.
+ *
+ * @return Compensated humidity data in double.
+ *
+ */
+static double compensate_humidity(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data);
+
+/*!
+ * @brief This internal API is used to compensate the raw temperature data and
+ * return the compensated temperature data in double data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated temperature data.
+ * @param[in] calib_data : Pointer to calibration data structure.
+ *
+ * @return Compensated temperature data in double.
+ *
+ */
+static double compensate_temperature(const struct bme280_uncomp_data* uncomp_data,
+ struct bme280_calib_data* calib_data);
+
+#else
+
+/*!
+ * @brief This internal API is used to compensate the raw temperature data and
+ * return the compensated temperature data in integer data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated temperature data.
+ * @param[in] calib_data : Pointer to calibration data structure.
+ *
+ * @return Compensated temperature data in integer.
+ *
+ */
+static int32_t compensate_temperature(const struct bme280_uncomp_data* uncomp_data,
+ struct bme280_calib_data* calib_data);
+
+/*!
+ * @brief This internal API is used to compensate the raw pressure data and
+ * return the compensated pressure data in integer data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated pressure data.
+ * @param[in] calib_data : Pointer to the calibration data structure.
+ *
+ * @return Compensated pressure data in integer.
+ *
+ */
+static uint32_t compensate_pressure(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data);
+
+/*!
+ * @brief This internal API is used to compensate the raw humidity data and
+ * return the compensated humidity data in integer data type.
+ *
+ * @param[in] uncomp_data : Contains the uncompensated humidity data.
+ * @param[in] calib_data : Pointer to the calibration data structure.
+ *
+ * @return Compensated humidity data in integer.
+ *
+ */
+static uint32_t compensate_humidity(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data);
+
+#endif
+
+/****************** Global Function Definitions *******************************/
+
+/*!
+ * @brief This API is the entry point.
+ * It reads the chip-id and calibration data from the sensor.
+ */
+int8_t bme280_init(struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t chip_id = 0;
+
+ /* Read the chip-id of bme280 sensor */
+ rslt = bme280_get_regs(BME280_REG_CHIP_ID, &chip_id, 1, dev);
+
+ /* Check for chip id validity */
+ if (rslt == BME280_OK) {
+ if (chip_id == BME280_CHIP_ID) {
+ dev->chip_id = chip_id;
+
+ /* Reset the sensor */
+ rslt = bme280_soft_reset(dev);
+
+ if (rslt == BME280_OK) {
+ /* Read the calibration data */
+ rslt = get_calib_data(dev);
+ }
+ } else {
+ rslt = BME280_E_DEV_NOT_FOUND;
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API reads the data from the given register address of the sensor.
+ */
+int8_t bme280_get_regs(uint8_t reg_addr, uint8_t* reg_data, uint32_t len, struct bme280_dev* dev) {
+ int8_t rslt;
+
+ /* Check for null pointer in the device structure */
+ rslt = null_ptr_check(dev);
+
+ if ((rslt == BME280_OK) && (reg_data != NULL)) {
+ /* If interface selected is SPI */
+ if (dev->intf != BME280_I2C_INTF) {
+ reg_addr = reg_addr | 0x80;
+ }
+
+ /* Read the data */
+ dev->intf_rslt = dev->read(reg_addr, reg_data, len, dev->intf_ptr);
+
+ /* Check for communication error */
+ if (dev->intf_rslt != BME280_INTF_RET_SUCCESS) {
+ rslt = BME280_E_COMM_FAIL;
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API writes the given data to the register address
+ * of the sensor.
+ */
+int8_t bme280_set_regs(uint8_t* reg_addr, const uint8_t* reg_data, uint32_t len, struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t temp_buff[20]; /* Typically not to write more than 10 registers */
+ uint32_t temp_len;
+ uint32_t reg_addr_cnt;
+
+ if (len > BME280_MAX_LEN) {
+ len = BME280_MAX_LEN;
+ }
+
+ /* Check for null pointer in the device structure */
+ rslt = null_ptr_check(dev);
+
+ /* Check for arguments validity */
+ if ((rslt == BME280_OK) && (reg_addr != NULL) && (reg_data != NULL)) {
+ if (len != 0) {
+ temp_buff[0] = reg_data[0];
+
+ /* If interface selected is SPI */
+ if (dev->intf != BME280_I2C_INTF) {
+ for (reg_addr_cnt = 0; reg_addr_cnt < len; reg_addr_cnt++) {
+ reg_addr[reg_addr_cnt] = reg_addr[reg_addr_cnt] & 0x7F;
+ }
+ }
+
+ /* Burst write mode */
+ if (len > 1) {
+ /* Interleave register address w.r.t data for
+ * burst write
+ */
+ interleave_reg_addr(reg_addr, temp_buff, reg_data, len);
+ temp_len = ((len * 2) - 1);
+ } else {
+ temp_len = len;
+ }
+
+ dev->intf_rslt = dev->write(reg_addr[0], temp_buff, temp_len, dev->intf_ptr);
+
+ /* Check for communication error */
+ if (dev->intf_rslt != BME280_INTF_RET_SUCCESS) {
+ rslt = BME280_E_COMM_FAIL;
+ }
+ } else {
+ rslt = BME280_E_INVALID_LEN;
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API sets the oversampling, filter and standby duration
+ * (normal mode) settings in the sensor.
+ */
+int8_t bme280_set_sensor_settings(uint8_t desired_settings,
+ const struct bme280_settings* settings,
+ struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t sensor_mode;
+
+ if (settings != NULL) {
+ rslt = bme280_get_sensor_mode(&sensor_mode, dev);
+
+ if ((rslt == BME280_OK) && (sensor_mode != BME280_POWERMODE_SLEEP)) {
+ rslt = put_device_to_sleep(dev);
+ }
+
+ if (rslt == BME280_OK) {
+ /* Check if user wants to change oversampling
+ * settings
+ */
+ if (are_settings_changed(OVERSAMPLING_SETTINGS, desired_settings)) {
+ rslt = set_osr_settings(desired_settings, settings, dev);
+ }
+
+ /* Check if user wants to change filter and/or
+ * standby settings
+ */
+ if ((rslt == BME280_OK) && are_settings_changed(FILTER_STANDBY_SETTINGS, desired_settings)) {
+ rslt = set_filter_standby_settings(desired_settings, settings, dev);
+ }
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API gets the oversampling, filter and standby duration
+ * (normal mode) settings from the sensor.
+ */
+int8_t bme280_get_sensor_settings(struct bme280_settings* settings, struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_data[4];
+
+ if (settings != NULL) {
+ rslt = bme280_get_regs(BME280_REG_CTRL_HUM, reg_data, 4, dev);
+
+ if (rslt == BME280_OK) {
+ parse_device_settings(reg_data, settings);
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API sets the power mode of the sensor.
+ */
+int8_t bme280_set_sensor_mode(uint8_t sensor_mode, struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t last_set_mode;
+
+ rslt = bme280_get_sensor_mode(&last_set_mode, dev);
+
+ /* If the sensor is not in sleep mode put the device to sleep
+ * mode
+ */
+ if ((rslt == BME280_OK) && (last_set_mode != BME280_POWERMODE_SLEEP)) {
+ rslt = put_device_to_sleep(dev);
+ }
+
+ /* Set the power mode */
+ if (rslt == BME280_OK) {
+ rslt = write_power_mode(sensor_mode, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API gets the power mode of the sensor.
+ */
+int8_t bme280_get_sensor_mode(uint8_t* sensor_mode, struct bme280_dev* dev) {
+ int8_t rslt;
+
+ if (sensor_mode != NULL) {
+ /* Read the power mode register */
+ rslt = bme280_get_regs(BME280_REG_PWR_CTRL, sensor_mode, 1, dev);
+
+ /* Assign the power mode to variable */
+ *sensor_mode = BME280_GET_BITS_POS_0(*sensor_mode, BME280_SENSOR_MODE);
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API performs the soft reset of the sensor.
+ */
+int8_t bme280_soft_reset(struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_addr = BME280_REG_RESET;
+ uint8_t status_reg = 0;
+ uint8_t try_run = 5;
+
+ /* 0xB6 is the soft reset command */
+ uint8_t soft_rst_cmd = BME280_SOFT_RESET_COMMAND;
+
+ /* Write the soft reset command in the sensor */
+ rslt = bme280_set_regs(®_addr, &soft_rst_cmd, 1, dev);
+
+ if (rslt == BME280_OK) {
+ /* If NVM not copied yet, Wait for NVM to copy */
+ do
+ {
+ /* As per data sheet - Table 1, startup time is 2 ms. */
+ dev->delay_us(BME280_STARTUP_DELAY, dev->intf_ptr);
+ rslt = bme280_get_regs(BME280_REG_STATUS, &status_reg, 1, dev);
+ } while ((rslt == BME280_OK) && (try_run--) && (status_reg & BME280_STATUS_IM_UPDATE));
+
+ if (status_reg & BME280_STATUS_IM_UPDATE) {
+ rslt = BME280_E_NVM_COPY_FAILED;
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API reads the pressure, temperature and humidity data from the
+ * sensor, compensates the data and store it in the bme280_data structure
+ * instance passed by the user.
+ */
+int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data* comp_data, struct bme280_dev* dev) {
+ int8_t rslt;
+
+ /* Array to store the pressure, temperature and humidity data read from
+ * the sensor
+ */
+ uint8_t reg_data[BME280_LEN_P_T_H_DATA] = { 0 };
+ struct bme280_uncomp_data uncomp_data = { 0 };
+
+ if (comp_data != NULL) {
+ /* Read the pressure and temperature data from the sensor */
+ rslt = bme280_get_regs(BME280_REG_DATA, reg_data, BME280_LEN_P_T_H_DATA, dev);
+
+ if (rslt == BME280_OK) {
+ /* Parse the read data from the sensor */
+ parse_sensor_data(reg_data, &uncomp_data);
+
+ /* Compensate the pressure and/or temperature and/or
+ * humidity data from the sensor
+ */
+ rslt = bme280_compensate_data(sensor_comp, &uncomp_data, comp_data, &dev->calib_data);
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to compensate the pressure and/or
+ * temperature and/or humidity data according to the component selected
+ * by the user.
+ */
+int8_t bme280_compensate_data(uint8_t sensor_comp,
+ const struct bme280_uncomp_data* uncomp_data,
+ struct bme280_data* comp_data,
+ struct bme280_calib_data* calib_data) {
+ int8_t rslt = BME280_OK;
+
+ if ((uncomp_data != NULL) && (comp_data != NULL) && (calib_data != NULL)) {
+ /* Initialize to zero */
+ comp_data->temperature = 0;
+ comp_data->pressure = 0;
+ comp_data->humidity = 0;
+
+ /* If pressure or temperature component is selected */
+ if (sensor_comp & (BME280_PRESS | BME280_TEMP | BME280_HUM)) {
+ /* Compensate the temperature data */
+ comp_data->temperature = compensate_temperature(uncomp_data, calib_data);
+ }
+
+ if (sensor_comp & BME280_PRESS) {
+ /* Compensate the pressure data */
+ comp_data->pressure = compensate_pressure(uncomp_data, calib_data);
+ }
+
+ if (sensor_comp & BME280_HUM) {
+ /* Compensate the humidity data */
+ comp_data->humidity = compensate_humidity(uncomp_data, calib_data);
+ }
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to calculate the maximum delay in milliseconds required for the
+ * temperature/pressure/humidity(whichever are enabled) measurement to complete.
+ */
+int8_t bme280_cal_meas_delay(uint32_t* max_delay, const struct bme280_settings* settings) {
+ int8_t rslt = BME280_OK;
+ uint8_t temp_osr;
+ uint8_t pres_osr;
+ uint8_t hum_osr;
+
+ /* Array to map OSR config register value to actual OSR */
+ uint8_t osr_sett_to_act_osr[] = { 0, 1, 2, 4, 8, 16 };
+
+ if ((settings != NULL) && (max_delay != NULL)) {
+ /* Mapping osr settings to the actual osr values e.g. 0b101 -> osr X16 */
+ if (settings->osr_t <= BME280_OVERSAMPLING_16X) {
+ temp_osr = osr_sett_to_act_osr[settings->osr_t];
+ } else {
+ temp_osr = BME280_OVERSAMPLING_MAX;
+ }
+
+ if (settings->osr_p <= BME280_OVERSAMPLING_16X) {
+ pres_osr = osr_sett_to_act_osr[settings->osr_p];
+ } else {
+ pres_osr = BME280_OVERSAMPLING_MAX;
+ }
+
+ if (settings->osr_h <= BME280_OVERSAMPLING_16X) {
+ hum_osr = osr_sett_to_act_osr[settings->osr_h];
+ } else {
+ hum_osr = BME280_OVERSAMPLING_MAX;
+ }
+
+ (*max_delay) =
+ (uint32_t)((BME280_MEAS_OFFSET + (BME280_MEAS_DUR * temp_osr) +
+ ((BME280_MEAS_DUR * pres_osr) + BME280_PRES_HUM_MEAS_OFFSET) +
+ ((BME280_MEAS_DUR * hum_osr) + BME280_PRES_HUM_MEAS_OFFSET)));
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/****************************************************************************/
+/**\name INTERNAL APIs */
+
+/*!
+ * @brief This internal API sets the oversampling settings for pressure,
+ * temperature and humidity in the sensor.
+ */
+static int8_t set_osr_settings(uint8_t desired_settings, const struct bme280_settings* settings,
+ struct bme280_dev* dev) {
+ int8_t rslt = BME280_W_INVALID_OSR_MACRO;
+
+ if (desired_settings & BME280_SEL_OSR_HUM) {
+ rslt = set_osr_humidity_settings(settings, dev);
+ }
+
+ if (desired_settings & (BME280_SEL_OSR_PRESS | BME280_SEL_OSR_TEMP)) {
+ rslt = set_osr_press_temp_settings(desired_settings, settings, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API sets the humidity oversampling settings of the sensor.
+ */
+static int8_t set_osr_humidity_settings(const struct bme280_settings* settings, struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t ctrl_hum;
+ uint8_t ctrl_meas;
+ uint8_t reg_addr = BME280_REG_CTRL_HUM;
+
+ ctrl_hum = settings->osr_h & BME280_CTRL_HUM_MSK;
+
+ /* Write the humidity control value in the register */
+ rslt = bme280_set_regs(®_addr, &ctrl_hum, 1, dev);
+
+ /* Humidity related changes will be only effective after a
+ * write operation to ctrl_meas register
+ */
+ if (rslt == BME280_OK) {
+ reg_addr = BME280_REG_CTRL_MEAS;
+ rslt = bme280_get_regs(reg_addr, &ctrl_meas, 1, dev);
+
+ if (rslt == BME280_OK) {
+ rslt = bme280_set_regs(®_addr, &ctrl_meas, 1, dev);
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API sets the pressure and/or temperature oversampling settings
+ * in the sensor according to the settings selected by the user.
+ */
+static int8_t set_osr_press_temp_settings(uint8_t desired_settings,
+ const struct bme280_settings* settings,
+ struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_addr = BME280_REG_CTRL_MEAS;
+ uint8_t reg_data;
+
+ rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
+
+ if (rslt == BME280_OK) {
+ if (desired_settings & BME280_SEL_OSR_PRESS) {
+ fill_osr_press_settings(®_data, settings);
+ }
+
+ if (desired_settings & BME280_SEL_OSR_TEMP) {
+ fill_osr_temp_settings(®_data, settings);
+ }
+
+ /* Write the oversampling settings in the register */
+ rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API sets the filter and/or standby duration settings
+ * in the sensor according to the settings selected by the user.
+ */
+static int8_t set_filter_standby_settings(uint8_t desired_settings,
+ const struct bme280_settings* settings,
+ struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_addr = BME280_REG_CONFIG;
+ uint8_t reg_data;
+
+ rslt = bme280_get_regs(reg_addr, ®_data, 1, dev);
+
+ if (rslt == BME280_OK) {
+ if (desired_settings & BME280_SEL_FILTER) {
+ fill_filter_settings(®_data, settings);
+ }
+
+ if (desired_settings & BME280_SEL_STANDBY) {
+ fill_standby_settings(®_data, settings);
+ }
+
+ /* Write the oversampling settings in the register */
+ rslt = bme280_set_regs(®_addr, ®_data, 1, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API fills the filter settings provided by the user
+ * in the data buffer so as to write in the sensor.
+ */
+static void fill_filter_settings(uint8_t* reg_data, const struct bme280_settings* settings) {
+ *reg_data = BME280_SET_BITS(*reg_data, BME280_FILTER, settings->filter);
+}
+
+/*!
+ * @brief This internal API fills the standby duration settings provided by
+ * the user in the data buffer so as to write in the sensor.
+ */
+static void fill_standby_settings(uint8_t* reg_data, const struct bme280_settings* settings) {
+ *reg_data = BME280_SET_BITS(*reg_data, BME280_STANDBY, settings->standby_time);
+}
+
+/*!
+ * @brief This internal API fills the pressure oversampling settings provided by
+ * the user in the data buffer so as to write in the sensor.
+ */
+static void fill_osr_press_settings(uint8_t* reg_data, const struct bme280_settings* settings) {
+ *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_PRESS, settings->osr_p);
+}
+
+/*!
+ * @brief This internal API fills the temperature oversampling settings
+ * provided by the user in the data buffer so as to write in the sensor.
+ */
+static void fill_osr_temp_settings(uint8_t* reg_data, const struct bme280_settings* settings) {
+ *reg_data = BME280_SET_BITS(*reg_data, BME280_CTRL_TEMP, settings->osr_t);
+}
+
+/*!
+ * @brief This internal API parse the oversampling(pressure, temperature
+ * and humidity), filter and standby duration settings and store in the
+ * bme280_settings structure.
+ */
+static void parse_device_settings(const uint8_t* reg_data, struct bme280_settings* settings) {
+ settings->osr_h = BME280_GET_BITS_POS_0(reg_data[0], BME280_CTRL_HUM);
+ settings->osr_p = BME280_GET_BITS(reg_data[2], BME280_CTRL_PRESS);
+ settings->osr_t = BME280_GET_BITS(reg_data[2], BME280_CTRL_TEMP);
+ settings->filter = BME280_GET_BITS(reg_data[3], BME280_FILTER);
+ settings->standby_time = BME280_GET_BITS(reg_data[3], BME280_STANDBY);
+}
+
+/*!
+ * @brief This API is used to parse the pressure, temperature and
+ * humidity data and store it in the bme280_uncomp_data structure instance.
+ */
+static void parse_sensor_data(const uint8_t* reg_data, struct bme280_uncomp_data* uncomp_data) {
+ /* Variables to store the sensor data */
+ uint32_t data_xlsb;
+ uint32_t data_lsb;
+ uint32_t data_msb;
+
+ /* Store the parsed register values for pressure data */
+ data_msb = (uint32_t)reg_data[0] << BME280_12_BIT_SHIFT;
+ data_lsb = (uint32_t)reg_data[1] << BME280_4_BIT_SHIFT;
+ data_xlsb = (uint32_t)reg_data[2] >> BME280_4_BIT_SHIFT;
+ uncomp_data->pressure = data_msb | data_lsb | data_xlsb;
+
+ /* Store the parsed register values for temperature data */
+ data_msb = (uint32_t)reg_data[3] << BME280_12_BIT_SHIFT;
+ data_lsb = (uint32_t)reg_data[4] << BME280_4_BIT_SHIFT;
+ data_xlsb = (uint32_t)reg_data[5] >> BME280_4_BIT_SHIFT;
+ uncomp_data->temperature = data_msb | data_lsb | data_xlsb;
+
+ /* Store the parsed register values for humidity data */
+ data_msb = (uint32_t)reg_data[6] << BME280_8_BIT_SHIFT;
+ data_lsb = (uint32_t)reg_data[7];
+ uncomp_data->humidity = data_msb | data_lsb;
+}
+
+/*!
+ * @brief This internal API writes the power mode in the sensor.
+ */
+static int8_t write_power_mode(uint8_t sensor_mode, struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_addr = BME280_REG_PWR_CTRL;
+
+ /* Variable to store the value read from power mode register */
+ uint8_t sensor_mode_reg_val;
+
+ /* Read the power mode register */
+ rslt = bme280_get_regs(reg_addr, &sensor_mode_reg_val, 1, dev);
+
+ /* Set the power mode */
+ if (rslt == BME280_OK) {
+ sensor_mode_reg_val = BME280_SET_BITS_POS_0(sensor_mode_reg_val, BME280_SENSOR_MODE, sensor_mode);
+
+ /* Write the power mode in the register */
+ rslt = bme280_set_regs(®_addr, &sensor_mode_reg_val, 1, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API puts the device to sleep mode.
+ */
+static int8_t put_device_to_sleep(struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_data[4];
+ struct bme280_settings settings;
+
+ rslt = bme280_get_regs(BME280_REG_CTRL_HUM, reg_data, 4, dev);
+
+ if (rslt == BME280_OK) {
+ parse_device_settings(reg_data, &settings);
+ rslt = bme280_soft_reset(dev);
+
+ if (rslt == BME280_OK) {
+ rslt = reload_device_settings(&settings, dev);
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API reloads the already existing device settings in
+ * the sensor after soft reset.
+ */
+static int8_t reload_device_settings(const struct bme280_settings* settings, struct bme280_dev* dev) {
+ int8_t rslt;
+
+ rslt = set_osr_settings(BME280_SEL_ALL_SETTINGS, settings, dev);
+
+ if (rslt == BME280_OK) {
+ rslt = set_filter_standby_settings(BME280_SEL_ALL_SETTINGS, settings, dev);
+ }
+
+ return rslt;
+}
+
+#ifdef BME280_DOUBLE_ENABLE
+
+/*!
+ * @brief This internal API is used to compensate the raw temperature data and
+ * return the compensated temperature data in double data type.
+ */
+static double compensate_temperature(const struct bme280_uncomp_data* uncomp_data,
+ struct bme280_calib_data* calib_data) {
+ double var1;
+ double var2;
+ double temperature;
+ double temperature_min = -40;
+ double temperature_max = 85;
+
+ var1 = (((double)uncomp_data->temperature) / 16384.0 - ((double)calib_data->dig_t1) / 1024.0);
+ var1 = var1 * ((double)calib_data->dig_t2);
+ var2 = (((double)uncomp_data->temperature) / 131072.0 - ((double)calib_data->dig_t1) / 8192.0);
+ var2 = (var2 * var2) * ((double)calib_data->dig_t3);
+ calib_data->t_fine = (int32_t)(var1 + var2);
+ temperature = (var1 + var2) / 5120.0;
+
+ if (temperature < temperature_min) {
+ temperature = temperature_min;
+ } else if (temperature > temperature_max) {
+ temperature = temperature_max;
+ }
+
+ return temperature;
+}
+
+/*!
+ * @brief This internal API is used to compensate the raw pressure data and
+ * return the compensated pressure data in double data type.
+ */
+static double compensate_pressure(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data) {
+ double var1;
+ double var2;
+ double var3;
+ double pressure;
+ double pressure_min = 30000.0;
+ double pressure_max = 110000.0;
+
+ var1 = ((double)calib_data->t_fine / 2.0) - 64000.0;
+ var2 = var1 * var1 * ((double)calib_data->dig_p6) / 32768.0;
+ var2 = var2 + var1 * ((double)calib_data->dig_p5) * 2.0;
+ var2 = (var2 / 4.0) + (((double)calib_data->dig_p4) * 65536.0);
+ var3 = ((double)calib_data->dig_p3) * var1 * var1 / 524288.0;
+ var1 = (var3 + ((double)calib_data->dig_p2) * var1) / 524288.0;
+ var1 = (1.0 + var1 / 32768.0) * ((double)calib_data->dig_p1);
+
+ /* Avoid exception caused by division by zero */
+ if (var1 > (0.0)) {
+ pressure = 1048576.0 - (double) uncomp_data->pressure;
+ pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1;
+ var1 = ((double)calib_data->dig_p9) * pressure * pressure / 2147483648.0;
+ var2 = pressure * ((double)calib_data->dig_p8) / 32768.0;
+ pressure = pressure + (var1 + var2 + ((double)calib_data->dig_p7)) / 16.0;
+
+ if (pressure < pressure_min) {
+ pressure = pressure_min;
+ } else if (pressure > pressure_max) {
+ pressure = pressure_max;
+ }
+ } else { /* Invalid case */
+ pressure = pressure_min;
+ }
+
+ return pressure;
+}
+
+/*!
+ * @brief This internal API is used to compensate the raw humidity data and
+ * return the compensated humidity data in double data type.
+ */
+static double compensate_humidity(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data) {
+ double humidity;
+ double humidity_min = 0.0;
+ double humidity_max = 100.0;
+ double var1;
+ double var2;
+ double var3;
+ double var4;
+ double var5;
+ double var6;
+
+ var1 = ((double)calib_data->t_fine) - 76800.0;
+ var2 = (((double)calib_data->dig_h4) * 64.0 + (((double)calib_data->dig_h5) / 16384.0) * var1);
+ var3 = uncomp_data->humidity - var2;
+ var4 = ((double)calib_data->dig_h2) / 65536.0;
+ var5 = (1.0 + (((double)calib_data->dig_h3) / 67108864.0) * var1);
+ var6 = 1.0 + (((double)calib_data->dig_h6) / 67108864.0) * var1 * var5;
+ var6 = var3 * var4 * (var5 * var6);
+ humidity = var6 * (1.0 - ((double)calib_data->dig_h1) * var6 / 524288.0);
+
+ if (humidity > humidity_max) {
+ humidity = humidity_max;
+ } else if (humidity < humidity_min) {
+ humidity = humidity_min;
+ }
+
+ return humidity;
+}
+
+#else
+
+/*!
+ * @brief This internal API is used to compensate the raw temperature data and
+ * return the compensated temperature data in integer data type.
+ */
+static int32_t compensate_temperature(const struct bme280_uncomp_data* uncomp_data,
+ struct bme280_calib_data* calib_data) {
+ int32_t var1;
+ int32_t var2;
+ int32_t temperature;
+ int32_t temperature_min = -4000;
+ int32_t temperature_max = 8500;
+
+ var1 = (int32_t)((uncomp_data->temperature / 8) - ((int32_t)calib_data->dig_t1 * 2));
+ var1 = (var1 * ((int32_t)calib_data->dig_t2)) / 2048;
+ var2 = (int32_t)((uncomp_data->temperature / 16) - ((int32_t)calib_data->dig_t1));
+ var2 = (((var2 * var2) / 4096) * ((int32_t)calib_data->dig_t3)) / 16384;
+ calib_data->t_fine = var1 + var2;
+ temperature = (calib_data->t_fine * 5 + 128) / 256;
+
+ if (temperature < temperature_min) {
+ temperature = temperature_min;
+ } else if (temperature > temperature_max) {
+ temperature = temperature_max;
+ }
+
+ return temperature;
+}
+
+#ifndef BME280_32BIT_ENABLE /* 64 bit compensation for pressure data */
+
+/*!
+ * @brief This internal API is used to compensate the raw pressure data and
+ * return the compensated pressure data in integer data type with higher
+ * accuracy.
+ */
+static uint32_t compensate_pressure(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data) {
+ int64_t var1;
+ int64_t var2;
+ int64_t var3;
+ int64_t var4;
+ uint32_t pressure;
+ uint32_t pressure_min = 3000000;
+ uint32_t pressure_max = 11000000;
+
+ var1 = ((int64_t)calib_data->t_fine) - 128000;
+ var2 = var1 * var1 * (int64_t)calib_data->dig_p6;
+ var2 = var2 + ((var1 * (int64_t)calib_data->dig_p5) * 131072);
+ var2 = var2 + (((int64_t)calib_data->dig_p4) * 34359738368);
+ var1 = ((var1 * var1 * (int64_t)calib_data->dig_p3) / 256) + ((var1 * ((int64_t)calib_data->dig_p2) * 4096));
+ var3 = ((int64_t)1) * 140737488355328;
+ var1 = (var3 + var1) * ((int64_t)calib_data->dig_p1) / 8589934592;
+
+ /* To avoid divide by zero exception */
+ if (var1 != 0) {
+ var4 = 1048576 - uncomp_data->pressure;
+ var4 = (((var4 * INT64_C(2147483648)) - var2) * 3125) / var1;
+ var1 = (((int64_t)calib_data->dig_p9) * (var4 / 8192) * (var4 / 8192)) / 33554432;
+ var2 = (((int64_t)calib_data->dig_p8) * var4) / 524288;
+ var4 = ((var4 + var1 + var2) / 256) + (((int64_t)calib_data->dig_p7) * 16);
+ pressure = (uint32_t)(((var4 / 2) * 100) / 128);
+
+ if (pressure < pressure_min) {
+ pressure = pressure_min;
+ } else if (pressure > pressure_max) {
+ pressure = pressure_max;
+ }
+ } else {
+ pressure = pressure_min;
+ }
+
+ return pressure;
+}
+
+#else /* 32 bit compensation for pressure data */
+
+/*!
+ * @brief This internal API is used to compensate the raw pressure data and
+ * return the compensated pressure data in integer data type.
+ */
+static uint32_t compensate_pressure(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data) {
+ int32_t var1;
+ int32_t var2;
+ int32_t var3;
+ int32_t var4;
+ uint32_t var5;
+ uint32_t pressure;
+ uint32_t pressure_min = 30000;
+ uint32_t pressure_max = 110000;
+
+ var1 = (((int32_t)calib_data->t_fine) / 2) - (int32_t)64000;
+ var2 = (((var1 / 4) * (var1 / 4)) / 2048) * ((int32_t)calib_data->dig_p6);
+ var2 = var2 + ((var1 * ((int32_t)calib_data->dig_p5)) * 2);
+ var2 = (var2 / 4) + (((int32_t)calib_data->dig_p4) * 65536);
+ var3 = (calib_data->dig_p3 * (((var1 / 4) * (var1 / 4)) / 8192)) / 8;
+ var4 = (((int32_t)calib_data->dig_p2) * var1) / 2;
+ var1 = (var3 + var4) / 262144;
+ var1 = (((32768 + var1)) * ((int32_t)calib_data->dig_p1)) / 32768;
+
+ /* Avoid exception caused by division by zero */
+ if (var1) {
+ var5 = (uint32_t)((uint32_t)1048576) - uncomp_data->pressure;
+ pressure = ((uint32_t)(var5 - (uint32_t)(var2 / 4096))) * 3125;
+
+ if (pressure < 0x80000000) {
+ pressure = (pressure << 1) / ((uint32_t)var1);
+ } else {
+ pressure = (pressure / (uint32_t)var1) * 2;
+ }
+
+ var1 = (((int32_t)calib_data->dig_p9) * ((int32_t)(((pressure / 8) * (pressure / 8)) / 8192))) / 4096;
+ var2 = (((int32_t)(pressure / 4)) * ((int32_t)calib_data->dig_p8)) / 8192;
+ pressure = (uint32_t)((int32_t)pressure + ((var1 + var2 + calib_data->dig_p7) / 16));
+
+ if (pressure < pressure_min) {
+ pressure = pressure_min;
+ } else if (pressure > pressure_max) {
+ pressure = pressure_max;
+ }
+ } else {
+ pressure = pressure_min;
+ }
+
+ return pressure;
+}
+
+#endif
+
+/*!
+ * @brief This internal API is used to compensate the raw humidity data and
+ * return the compensated humidity data in integer data type.
+ */
+static uint32_t compensate_humidity(const struct bme280_uncomp_data* uncomp_data,
+ const struct bme280_calib_data* calib_data) {
+ int32_t var1;
+ int32_t var2;
+ int32_t var3;
+ int32_t var4;
+ int32_t var5;
+ uint32_t humidity;
+ uint32_t humidity_max = 102400;
+
+ var1 = calib_data->t_fine - ((int32_t)76800);
+ var2 = (int32_t)(uncomp_data->humidity * 16384);
+ var3 = (int32_t)(((int32_t)calib_data->dig_h4) * 1048576);
+ var4 = ((int32_t)calib_data->dig_h5) * var1;
+ var5 = (((var2 - var3) - var4) + (int32_t)16384) / 32768;
+ var2 = (var1 * ((int32_t)calib_data->dig_h6)) / 1024;
+ var3 = (var1 * ((int32_t)calib_data->dig_h3)) / 2048;
+ var4 = ((var2 * (var3 + (int32_t)32768)) / 1024) + (int32_t)2097152;
+ var2 = ((var4 * ((int32_t)calib_data->dig_h2)) + 8192) / 16384;
+ var3 = var5 * var2;
+ var4 = ((var3 / 32768) * (var3 / 32768)) / 128;
+ var5 = var3 - ((var4 * ((int32_t)calib_data->dig_h1)) / 16);
+ var5 = (var5 < 0 ? 0 : var5);
+ var5 = (var5 > 419430400 ? 419430400 : var5);
+ humidity = (uint32_t)(var5 / 4096);
+
+ if (humidity > humidity_max) {
+ humidity = humidity_max;
+ }
+
+ return humidity;
+}
+
+#endif
+
+/*!
+ * @brief This internal API reads the calibration data from the sensor, parse
+ * it and store in the device structure.
+ */
+static int8_t get_calib_data(struct bme280_dev* dev) {
+ int8_t rslt;
+ uint8_t reg_addr = BME280_REG_TEMP_PRESS_CALIB_DATA;
+
+ /* Array to store calibration data */
+ uint8_t calib_data[BME280_LEN_TEMP_PRESS_CALIB_DATA] = { 0 };
+
+ /* Read the calibration data from the sensor */
+ rslt = bme280_get_regs(reg_addr, calib_data, BME280_LEN_TEMP_PRESS_CALIB_DATA, dev);
+
+ if (rslt == BME280_OK) {
+ /* Parse temperature and pressure calibration data and store
+ * it in device structure
+ */
+ parse_temp_press_calib_data(calib_data, dev);
+ reg_addr = BME280_REG_HUMIDITY_CALIB_DATA;
+
+ /* Read the humidity calibration data from the sensor */
+ rslt = bme280_get_regs(reg_addr, calib_data, BME280_LEN_HUMIDITY_CALIB_DATA, dev);
+
+ if (rslt == BME280_OK) {
+ /* Parse humidity calibration data and store it in
+ * device structure
+ */
+ parse_humidity_calib_data(calib_data, dev);
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API interleaves the register address between the
+ * register data buffer for burst write operation.
+ */
+static void interleave_reg_addr(const uint8_t* reg_addr, uint8_t* temp_buff, const uint8_t* reg_data, uint32_t len) {
+ uint32_t index;
+
+ for (index = 1; index < len; index++) {
+ temp_buff[(index * 2) - 1] = reg_addr[index];
+ temp_buff[index * 2] = reg_data[index];
+ }
+}
+
+/*!
+ * @brief This internal API is used to parse the temperature and
+ * pressure calibration data and store it in device structure.
+ */
+static void parse_temp_press_calib_data(const uint8_t* reg_data, struct bme280_dev* dev) {
+ struct bme280_calib_data* calib_data = &dev->calib_data;
+
+ calib_data->dig_t1 = BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
+ calib_data->dig_t2 = (int16_t)BME280_CONCAT_BYTES(reg_data[3], reg_data[2]);
+ calib_data->dig_t3 = (int16_t)BME280_CONCAT_BYTES(reg_data[5], reg_data[4]);
+ calib_data->dig_p1 = BME280_CONCAT_BYTES(reg_data[7], reg_data[6]);
+ calib_data->dig_p2 = (int16_t)BME280_CONCAT_BYTES(reg_data[9], reg_data[8]);
+ calib_data->dig_p3 = (int16_t)BME280_CONCAT_BYTES(reg_data[11], reg_data[10]);
+ calib_data->dig_p4 = (int16_t)BME280_CONCAT_BYTES(reg_data[13], reg_data[12]);
+ calib_data->dig_p5 = (int16_t)BME280_CONCAT_BYTES(reg_data[15], reg_data[14]);
+ calib_data->dig_p6 = (int16_t)BME280_CONCAT_BYTES(reg_data[17], reg_data[16]);
+ calib_data->dig_p7 = (int16_t)BME280_CONCAT_BYTES(reg_data[19], reg_data[18]);
+ calib_data->dig_p8 = (int16_t)BME280_CONCAT_BYTES(reg_data[21], reg_data[20]);
+ calib_data->dig_p9 = (int16_t)BME280_CONCAT_BYTES(reg_data[23], reg_data[22]);
+ calib_data->dig_h1 = reg_data[25];
+}
+
+/*!
+ * @brief This internal API is used to parse the humidity calibration data
+ * and store it in device structure.
+ */
+static void parse_humidity_calib_data(const uint8_t* reg_data, struct bme280_dev* dev) {
+ struct bme280_calib_data* calib_data = &dev->calib_data;
+ int16_t dig_h4_lsb;
+ int16_t dig_h4_msb;
+ int16_t dig_h5_lsb;
+ int16_t dig_h5_msb;
+
+ calib_data->dig_h2 = (int16_t)BME280_CONCAT_BYTES(reg_data[1], reg_data[0]);
+ calib_data->dig_h3 = reg_data[2];
+ dig_h4_msb = (int16_t)(int8_t)reg_data[3] * 16;
+ dig_h4_lsb = (int16_t)(reg_data[4] & 0x0F);
+ calib_data->dig_h4 = dig_h4_msb | dig_h4_lsb;
+ dig_h5_msb = (int16_t)(int8_t)reg_data[5] * 16;
+ dig_h5_lsb = (int16_t)(reg_data[4] >> 4);
+ calib_data->dig_h5 = dig_h5_msb | dig_h5_lsb;
+ calib_data->dig_h6 = (int8_t)reg_data[6];
+}
+
+/*!
+ * @brief This internal API is used to identify the settings which the user
+ * wants to modify in the sensor.
+ */
+static uint8_t are_settings_changed(uint8_t sub_settings, uint8_t desired_settings) {
+ uint8_t settings_changed = FALSE;
+
+ if (sub_settings & desired_settings) {
+ /* User wants to modify this particular settings */
+ settings_changed = TRUE;
+ } else {
+ /* User don't want to modify this particular settings */
+ settings_changed = FALSE;
+ }
+
+ return settings_changed;
+}
+
+/*!
+ * @brief This internal API is used to validate the device structure pointer for
+ * null conditions.
+ */
+static int8_t null_ptr_check(const struct bme280_dev* dev) {
+ int8_t rslt;
+
+ if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_us == NULL)) {
+ /* Device structure pointer is not valid */
+ rslt = BME280_E_NULL_PTR;
+ } else {
+ /* Device structure is fine */
+ rslt = BME280_OK;
+ }
+
+ return rslt;
+}
diff --git a/examples/bme280/bme280.h b/examples/bme280/bme280.h
new file mode 100644
index 000000000..8b47c303b
--- /dev/null
+++ b/examples/bme280/bme280.h
@@ -0,0 +1,398 @@
+/**
+* Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
+*
+* BSD-3-Clause
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*
+* 2. Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in the
+* documentation and/or other materials provided with the distribution.
+*
+* 3. Neither the name of the copyright holder nor the names of its
+* contributors may be used to endorse or promote products derived from
+* this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
+*
+* @file bme280.h
+* @date 2020-12-17
+* @version v3.5.1
+*
+*/
+
+/*! @file bme280.h
+ * @brief Sensor driver for BME280 sensor
+ */
+
+/*!
+ * @ingroup stm32
+ * @defgroup bme280 BME280
+ * @brief Product Overview
+ * and Sensor API Source Code
+ */
+
+#ifndef _BME280_H
+#define _BME280_H
+
+/*! CPP guard */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Header includes */
+#include "bme280_defs.h"
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiInit Initialization
+ * @brief Initialize the sensor and device structure
+ */
+
+/*!
+ * \ingroup bme280ApiInit
+ * \page bme280_api_bme280_init bme280_init
+ * \code
+ * int8_t bme280_init(struct bme280_dev *dev);
+ * \endcode
+ * @details This API reads the chip-id of the sensor which is the first step to
+ * verify the sensor and also calibrates the sensor
+ * As this API is the entry point, call this API before using other APIs.
+ *
+ * @param[in,out] dev : Structure instance of bme280_dev
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_init(struct bme280_dev *dev);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiRegister Registers
+ * @brief Generic API for accessing sensor registers
+ */
+
+/*!
+ * \ingroup bme280ApiRegister
+ * \page bme280_api_bme280_set_regs bme280_set_regs
+ * \code
+ * int8_t bme280_set_regs(const uint8_t reg_addr, const uint8_t *reg_data, uint32_t len, struct bme280_dev *dev);
+ * \endcode
+ * @details This API writes the given data to the register address of the sensor
+ *
+ * @param[in] reg_addr : Register addresses to where the data is to be written
+ * @param[in] reg_data : Pointer to data buffer which is to be written
+ * in the reg_addr of sensor.
+ * @param[in] len : No of bytes of data to write
+ * @param[in,out] dev : Structure instance of bme280_dev
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_set_regs(uint8_t *reg_addr, const uint8_t *reg_data, uint32_t len, struct bme280_dev *dev);
+
+/*!
+ * \ingroup bme280ApiRegister
+ * \page bme280_api_bme280_get_regs bme280_get_regs
+ * \code
+ * int8_t bme280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, struct bme280_dev *dev);
+ * \endcode
+ * @details This API reads the data from the given register address of sensor.
+ *
+ * @param[in] reg_addr : Register address from where the data to be read
+ * @param[out] reg_data : Pointer to data buffer to store the read data.
+ * @param[in] len : No of bytes of data to be read.
+ * @param[in,out] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, struct bme280_dev *dev);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiSensorSettings Sensor Settings
+ * @brief Generic API for accessing sensor settings
+ */
+
+/*!
+ * \ingroup bme280ApiSensorSettings
+ * \page bme280_api_bme280_set_sensor_settings bme280_set_sensor_settings
+ * \code
+ * int8_t bme280_set_sensor_settings(uint8_t desired_settings, const struct bme280_settings *settings, struct bme280_dev *dev);
+ * \endcode
+ * @details This API sets the oversampling, filter and standby duration
+ * (normal mode) settings in the sensor.
+ *
+ * @param[in] desired_settings : Variable used to select the settings which
+ * are to be set in the sensor.
+ * @param[in] settings : Structure instance of bme280_settings.
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @note : Below are the macros to be used by the user for selecting the
+ * desired settings. User can do OR operation of these macros for configuring
+ * multiple settings.
+ *
+ *@verbatim
+ * Macros | Functionality
+ * -----------------------|----------------------------------------------
+ * BME280_SEL_OSR_PRESS | To set pressure oversampling.
+ * BME280_SEL_OSR_TEMP | To set temperature oversampling.
+ * BME280_SEL_OSR_HUM | To set humidity oversampling.
+ * BME280_SEL_FILTER | To set filter setting.
+ * BME280_SEL_STANDBY | To set standby duration setting.
+ *@endverbatim
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_set_sensor_settings(uint8_t desired_settings,
+ const struct bme280_settings *settings,
+ struct bme280_dev *dev);
+
+/*!
+ * \ingroup bme280ApiSensorSettings
+ * \page bme280_api_bme280_get_sensor_settings bme280_get_sensor_settings
+ * \code
+ * int8_t bme280_get_sensor_settings(struct bme280_settings *settings, struct bme280_dev *dev);
+ * \endcode
+ * @details This API gets the oversampling, filter and standby duration
+ * (normal mode) settings from the sensor.
+ *
+ * @param[in] settings : Structure instance of bme280_settings.
+ * @param[in,out] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_get_sensor_settings(struct bme280_settings *settings, struct bme280_dev *dev);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiSensorMode Sensor Mode
+ * @brief Generic API for configuring sensor power mode
+ */
+
+/*!
+ * \ingroup bme280ApiSensorMode
+ * \page bme280_api_bme280_set_sensor_mode bme280_set_sensor_mode
+ * \code
+ * int8_t bme280_set_sensor_mode(uint8_t sensor_mode, const struct bme280_dev *dev);
+ * \endcode
+ * @details This API sets the power mode of the sensor.
+ *
+ * @param[in] sensor_mode : Variable which contains the power mode to be set.
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ *@verbatim
+ * sensor_mode | Macros
+ * ---------------------|-------------------------
+ * 0 | BME280_POWERMODE_SLEEP
+ * 1 | BME280_POWERMODE_FORCED
+ * 3 | BME280_POWERMODE_NORMAL
+ *@endverbatim
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_set_sensor_mode(uint8_t sensor_mode, struct bme280_dev *dev);
+
+/*!
+ * \ingroup bme280ApiSensorMode
+ * \page bme280_api_bme280_get_sensor_mode bme280_get_sensor_mode
+ * \code
+ * int8_t bme280_get_sensor_mode(uint8_t *sensor_mode, struct bme280_dev *dev);
+ * \endcode
+ * @details This API gets the power mode of the sensor.
+ *
+ * @param[out] sensor_mode : Pointer variable to store the power mode.
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ *@verbatim
+ * sensor_mode | Macros
+ * ---------------------|-------------------------
+ * 0 | BME280_POWERMODE_SLEEP
+ * 1 | BME280_POWERMODE_FORCED
+ * 3 | BME280_POWERMODE_NORMAL
+ *@endverbatim
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_get_sensor_mode(uint8_t *sensor_mode, struct bme280_dev *dev);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiSystem System
+ * @brief API that performs system-level operations
+ */
+
+/*!
+ * \ingroup bme280ApiSystem
+ * \page bme280_api_bme280_soft_reset bme280_soft_reset
+ * \code
+ * int8_t bme280_soft_reset(struct bme280_dev *dev);
+ * \endcode
+ * @details This API soft-resets the sensor.
+ *
+ * @param[in,out] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_soft_reset(struct bme280_dev *dev);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiSensorData Sensor Data
+ * @brief Data processing of sensor
+ */
+
+/*!
+ * \ingroup bme280ApiSensorData
+ * \page bme280_api_bme280_get_sensor_data bme280_get_sensor_data
+ * \code
+ * int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev);
+ * \endcode
+ * @details This API reads the pressure, temperature and humidity data from the
+ * sensor, compensates the data and store it in the bme280_data structure
+ * instance passed by the user.
+ *
+ * @param[in] sensor_comp : Variable which selects which data to be read from
+ * the sensor.
+ *
+ *@verbatim
+ * sensor_comp | Macros
+ * ------------|-------------------
+ * 1 | BME280_PRESS
+ * 2 | BME280_TEMP
+ * 4 | BME280_HUM
+ * 7 | BME280_ALL
+ *@endverbatim
+ *
+ * @param[out] comp_data : Structure instance of bme280_data.
+ * @param[in] dev : Structure instance of bme280_dev.
+ *
+ * @return Result of API execution status
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_get_sensor_data(uint8_t sensor_comp, struct bme280_data *comp_data, struct bme280_dev *dev);
+
+/*!
+ * \ingroup bme280ApiSensorData
+ * \page bme280_api_bme280_compensate_data bme280_compensate_data
+ * \code
+ * int8_t bme280_compensate_data(uint8_t sensor_comp,
+ * const struct bme280_uncomp_data *uncomp_data,
+ * struct bme280_data *comp_data,
+ * struct bme280_calib_data *calib_data);
+ * \endcode
+ * @details This API is used to compensate the pressure and/or
+ * temperature and/or humidity data according to the component selected by the
+ * user.
+ *
+ * @param[in] sensor_comp : Used to select pressure and/or temperature and/or
+ * humidity.
+ * @param[in] uncomp_data : Contains the uncompensated pressure, temperature and
+ * humidity data.
+ * @param[out] comp_data : Contains the compensated pressure and/or temperature
+ * and/or humidity data.
+ * @param[in] calib_data : Pointer to bme280_calib_data
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_compensate_data(uint8_t sensor_comp,
+ const struct bme280_uncomp_data *uncomp_data,
+ struct bme280_data *comp_data,
+ struct bme280_calib_data *calib_data);
+
+/**
+ * \ingroup bme280
+ * \defgroup bme280ApiSensorDelay Sensor Delay
+ * @brief Generic API for measuring sensor delay
+ */
+
+/*!
+ * \ingroup bme280ApiSensorDelay
+ * \page bme280_api_bme280_cal_meas_delay bme280_cal_meas_delay
+ * \code
+ * uint32_t bme280_cal_meas_delay(uint32_t *max_delay, const struct bme280_settings *settings);
+ * \endcode
+ *
+ * @details This API is used to calculate the maximum delay in microseconds required for the
+ * temperature/pressure/humidity(whichever are enabled) measurement to complete.
+ * The delay depends upon the number of sensors enabled and their oversampling configuration.
+ *
+ * @param[out] max_delay : Delay required in microseconds.
+ * @param[in] settings : Contains the oversampling configurations.
+ *
+ * @return Result of API execution status.
+ *
+ * @retval 0 -> Success.
+ * @retval > 0 -> Warning.
+ * @retval < 0 -> Fail.
+ *
+ */
+int8_t bme280_cal_meas_delay(uint32_t *max_delay, const struct bme280_settings *settings);
+
+#ifdef __cplusplus
+}
+#endif /* End of CPP guard */
+#endif /* _BME280_H */
+/** @}*/
\ No newline at end of file
diff --git a/examples/bme280/bme280_common.c b/examples/bme280/bme280_common.c
new file mode 100644
index 000000000..7f12f60c3
--- /dev/null
+++ b/examples/bme280/bme280_common.c
@@ -0,0 +1,164 @@
+/**
+ * Copyright (C) 2020 Bosch Sensortec GmbH. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include
+#include
+#include
+
+#include
+#include
+
+#include "bme280.h"
+#include "bme280_common.h"
+
+/******************************************************************************/
+/*! Macros */
+
+
+/******************************************************************************/
+/*! Static variable definition */
+
+/*! Variable that holds the I2C device address or SPI chip selection */
+static uint8_t dev_addr;
+
+/**
+ * @brief Timeout for I2C calls
+ */
+
+/******************************************************************************/
+/*! User interface functions */
+
+/*!
+ * I2C read function map to COINES platform
+ */
+BME280_INTF_RET_TYPE bme280_i2c_read(uint8_t reg_addr, uint8_t* reg_data, uint32_t length, void* intf_ptr) {
+ dev_addr = *(uint8_t*)intf_ptr;
+ reg_data[0] = reg_addr;
+
+ // printf("read sync before\n");
+ // int status = i2c_master_write_read_sync(dev_addr << 1, reg_data, 1, length);
+ int status = i2c_master_write_sync(dev_addr << 1, ®_addr, 1);
+ status = i2c_master_read_sync(dev_addr << 1, reg_data, length);
+ // printf("read sync after\n");
+ for (uint32_t i = 0; i < length; i++) {
+ printf("%d", reg_data[i]);
+ }
+ printf("\n");
+
+ if (status != 0) {
+ return BME280_E_COMM_FAIL;
+ }
+
+ return BME280_OK;
+}
+
+/*!
+ * I2C write function map to COINES platform
+ */
+
+BME280_INTF_RET_TYPE bme280_i2c_write(uint8_t reg_addr, const uint8_t* reg_data, uint32_t length, void* intf_ptr) {
+ // printf("I2C write\n");
+ dev_addr = *(uint8_t*)intf_ptr;
+
+ int status = i2c_master_write_sync(dev_addr << 1, ®_addr, 1);
+ // printf("i2C write done\n");
+ if (status != 0) {
+ return BME280_E_COMM_FAIL;
+ }
+
+ status = i2c_master_write_sync(dev_addr << 1, (uint8_t*) reg_data, length);
+
+ if (status != 0) {
+ return BME280_E_COMM_FAIL;
+ }
+
+ return BME280_OK;
+}
+
+
+/*!
+ * Delay function map to COINES platform
+ */
+void bme280_delay_us(uint32_t period, void* intf_ptr) {
+
+ (void)intf_ptr;
+ // calculate us to ms
+ uint32_t period_ms = period / 1000;
+
+ // if no period then set to 1 to ensure delay
+ if (period_ms == 0) {
+ period_ms = 1;
+ }
+
+ // delay
+ libtocksync_alarm_delay_ms(period_ms);
+}
+
+/*!
+ * @brief Prints the execution status of the APIs.
+ */
+void bme280_error_codes_print_result(const char api_name[], int8_t rslt) {
+ if (rslt != BME280_OK) {
+ printf("%s\t", api_name);
+
+ switch (rslt) {
+ case BME280_E_NULL_PTR:
+ printf("Error [%d] : Null pointer error.", rslt);
+ printf(
+ "It occurs when the user tries to assign value (not address) to a pointer, which has been initialized to NULL.\r\n");
+ break;
+
+ case BME280_E_COMM_FAIL:
+ printf("Error [%d] : Communication failure error.", rslt);
+ printf("It occurs due to read/write operation failure and also due to power failure during communication\r\n");
+ break;
+
+ case BME280_E_DEV_NOT_FOUND:
+ printf("Error [%d] : Device not found error. It occurs when the device chip id is incorrectly read\r\n",
+ rslt);
+ break;
+
+ case BME280_E_INVALID_LEN:
+ printf("Error [%d] : Invalid length error. It occurs when write is done with invalid length\r\n", rslt);
+ break;
+
+ default:
+ printf("Error [%d] : Unknown error code\r\n", rslt);
+ break;
+ }
+ }
+}
+
+/*!
+ * @brief Function to select the interface between SPI and I2C.
+ */
+int8_t bme280_interface_selection(struct bme280_dev* dev, uint8_t intf) {
+ int8_t rslt = BME280_OK;
+
+ if (dev != NULL) {
+ /* Bus configuration : I2C */
+ if (intf == BME280_I2C_INTF) {
+ dev_addr = BME280_I2C_ADDR_SEC;
+ dev->read = bme280_i2c_read;
+ dev->write = bme280_i2c_write;
+ dev->intf = BME280_I2C_INTF;
+ }
+ /* Bus configuration : SPI */
+ else if (intf == BME280_SPI_INTF) {
+ rslt = BME280_E_DEV_NOT_FOUND;
+ }
+
+ /* Holds the I2C device addr or SPI chip selection */
+ dev->intf_ptr = &dev_addr;
+
+ /* Configure delay in microseconds */
+ dev->delay_us = bme280_delay_us;
+ } else {
+ rslt = BME280_E_NULL_PTR;
+ }
+
+ return rslt;
+}
diff --git a/examples/bme280/bme280_common.h b/examples/bme280/bme280_common.h
new file mode 100644
index 000000000..54fff6d0f
--- /dev/null
+++ b/examples/bme280/bme280_common.h
@@ -0,0 +1,132 @@
+/**\
+ * Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ **/
+
+#ifndef __BME280_COMMON_H__
+#define __BME280_COMMON_H__
+
+/*! CPP guard */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include
+#include "bme280.h"
+
+/***************************************************************************/
+
+/*! User function prototypes
+ ****************************************************************************/
+
+/*!
+ * @brief Function for reading the sensor's registers through SPI bus.
+ *
+ * @param[in] reg_addr : Register address from which data is read.
+ * @param[out] reg_data : Pointer to data buffer where read data is stored.
+ * @param[in] length : Number of bytes of data to be read.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs.
+ *
+ * @return Status of execution
+ *
+ * @retval BME280_INTF_RET_SUCCESS -> Success.
+ * @retval != BME280_INTF_RET_SUCCESS -> Failure.
+ *
+ */
+BME280_INTF_RET_TYPE bme280_spi_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, void *intf_ptr);
+
+/*!
+ * @brief Function for reading the sensor's registers through I2C bus.
+ *
+ * @param[in] reg_addr : Register address from which data is read.
+ * @param[out] reg_data : Pointer to data buffer where read data is stored.
+ * @param[in] length : Number of bytes of data to be read.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs.
+ *
+ * @return Status of execution
+ *
+ * @retval BME280_INTF_RET_SUCCESS -> Success.
+ * @retval != BME280_INTF_RET_SUCCESS -> Failure.
+ *
+ */
+BME280_INTF_RET_TYPE bme280_i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, void *intf_ptr);
+
+/*!
+ * @brief Function for writing the sensor's registers through SPI bus.
+ *
+ * @param[in] reg_addr : Register address to which the data is written.
+ * @param[in] reg_data : Pointer to data buffer in which data to be written
+ * is stored.
+ * @param[in] length : Number of bytes of data to be written.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs
+ *
+ * @return Status of execution
+ *
+ * @retval BME280_INTF_RET_SUCCESS -> Success.
+ * @retval != BME280_INTF_RET_SUCCESS -> Failure.
+ *
+ */
+BME280_INTF_RET_TYPE bme280_spi_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, void *intf_ptr);
+
+/*!
+ * @brief Function for writing the sensor's registers through I2C bus.
+ *
+ * @param[in] reg_addr : Register address to which the data is written.
+ * @param[in] reg_data : Pointer to data buffer in which data to be written
+ * is stored.
+ * @param[in] length : Number of bytes of data to be written.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs
+ *
+ * @return Status of execution
+ *
+ * @retval BME280_INTF_RET_SUCCESS -> Success.
+ * @retval != BME280_INTF_RET_SUCCESS -> Failure.
+ *
+ */
+BME280_INTF_RET_TYPE bme280_i2c_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, void *intf_ptr);
+
+/*!
+ * @brief This function provides the delay for required time (Microsecond) as per the input provided in some of the
+ * APIs.
+ *
+ * @param[in] period_us : The required wait time in microsecond.
+ * @param[in] intf_ptr : Interface pointer
+ *
+ * @return void.
+ */
+void bme280_delay_us(uint32_t period_us, void *intf_ptr);
+
+/*!
+ * @brief This function is to select the interface between SPI and I2C.
+ *
+ * @param[in] dev : Structure instance of bme280_dev
+ * @param[in] intf : Interface selection parameter
+ * For I2C : BME280_I2C_INTF
+ * For SPI : BME280_SPI_INTF
+ *
+ * @return Status of execution
+ * @retval 0 -> Success
+ * @retval < 0 -> Failure
+ */
+int8_t bme280_interface_selection(struct bme280_dev *dev, uint8_t intf);
+
+/*!
+ * @brief This API is used to print the execution status.
+ *
+ * @param[in] api_name : Name of the API whose execution status has to be printed.
+ * @param[in] rslt : Error code returned by the API whose execution status has to be printed.
+ *
+ * @return void.
+ */
+void bme280_error_codes_print_result(const char api_name[], int8_t rslt);
+
+#ifdef __cplusplus
+}
+#endif /* End of CPP guard */
+
+#endif /* __BME280_COMMON_H__ */
\ No newline at end of file
diff --git a/examples/bme280/bme280_defs.h b/examples/bme280/bme280_defs.h
new file mode 100644
index 000000000..e7edacdf9
--- /dev/null
+++ b/examples/bme280/bme280_defs.h
@@ -0,0 +1,494 @@
+/**
+* Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.
+*
+* BSD-3-Clause
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*
+* 2. Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in the
+* documentation and/or other materials provided with the distribution.
+*
+* 3. Neither the name of the copyright holder nor the names of its
+* contributors may be used to endorse or promote products derived from
+* this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
+*
+* @file bme280_defs.h
+* @date 2020-12-17
+* @version v3.5.1
+*
+*/
+
+#ifndef _BME280_DEFS_H
+#define _BME280_DEFS_H
+
+/********************************************************/
+/* header includes */
+#ifdef __KERNEL__
+#include
+#include
+#else
+#include
+#include
+#endif
+
+/********************************************************/
+/*! @name Common macros */
+/********************************************************/
+
+#if !defined(UINT8_C) && !defined(INT8_C)
+#define INT8_C(x) S8_C(x)
+#define UINT8_C(x) U8_C(x)
+#endif
+
+#if !defined(UINT16_C) && !defined(INT16_C)
+#define INT16_C(x) S16_C(x)
+#define UINT16_C(x) U16_C(x)
+#endif
+
+#if !defined(INT32_C) && !defined(UINT32_C)
+#define INT32_C(x) S32_C(x)
+#define UINT32_C(x) U32_C(x)
+#endif
+
+#if !defined(INT64_C) && !defined(UINT64_C)
+#define INT64_C(x) S64_C(x)
+#define UINT64_C(x) U64_C(x)
+#endif
+
+/**@}*/
+/**\name C standard macros */
+#ifndef NULL
+#ifdef __cplusplus
+#define NULL 0
+#else
+#define NULL ((void *) 0)
+#endif
+#endif
+
+/******************************************************************************/
+/*! @name Compiler switch macros Definitions */
+/******************************************************************************/
+#ifndef BME280_64BIT_ENABLE /*< Check if 64-bit integer (using BME280_64BIT_ENABLE) is enabled */
+#ifndef BME280_32BIT_ENABLE /*< Check if 32-bit integer (using BME280_32BIT_ENABLE) is enabled */
+#ifndef BME280_DOUBLE_ENABLE /*< If any of the integer data types not enabled then enable BME280_DOUBLE_ENABLE */
+#define BME280_DOUBLE_ENABLE
+#endif
+#endif
+#endif
+
+/******************************************************************************/
+/*! @name General Macro Definitions */
+/******************************************************************************/
+#ifndef TRUE
+#define TRUE UINT8_C(1)
+#endif
+#ifndef FALSE
+#define FALSE UINT8_C(0)
+#endif
+
+/*!
+ * BME280_INTF_RET_TYPE is the read/write interface return type which can be overwritten by the build system.
+ */
+#ifndef BME280_INTF_RET_TYPE
+#define BME280_INTF_RET_TYPE int8_t
+#endif
+
+/*!
+ * The last error code from read/write interface is stored in the device structure as intf_rslt.
+ */
+#ifndef BME280_INTF_RET_SUCCESS
+#define BME280_INTF_RET_SUCCESS INT8_C(0)
+#endif
+
+/*! @name API success code */
+#define BME280_OK INT8_C(0)
+
+/*! @name API error codes */
+#define BME280_E_NULL_PTR INT8_C(-1)
+#define BME280_E_COMM_FAIL INT8_C(-2)
+#define BME280_E_INVALID_LEN INT8_C(-3)
+#define BME280_E_DEV_NOT_FOUND INT8_C(-4)
+#define BME280_E_SLEEP_MODE_FAIL INT8_C(-5)
+#define BME280_E_NVM_COPY_FAILED INT8_C(-6)
+
+/*! @name API warning codes */
+#define BME280_W_INVALID_OSR_MACRO INT8_C(1)
+
+/*! @name BME280 chip identifier */
+#define BME280_CHIP_ID UINT8_C(0x60)
+
+/*! @name I2C addresses */
+#define BME280_I2C_ADDR_PRIM UINT8_C(0x76)
+#define BME280_I2C_ADDR_SEC UINT8_C(0x77)
+
+/*! @name Register Address */
+#define BME280_REG_CHIP_ID UINT8_C(0xD0)
+#define BME280_REG_RESET UINT8_C(0xE0)
+#define BME280_REG_TEMP_PRESS_CALIB_DATA UINT8_C(0x88)
+#define BME280_REG_HUMIDITY_CALIB_DATA UINT8_C(0xE1)
+#define BME280_REG_CTRL_HUM UINT8_C(0xF2)
+#define BME280_REG_STATUS UINT8_C(0xF3)
+#define BME280_REG_PWR_CTRL UINT8_C(0xF4)
+#define BME280_REG_CTRL_MEAS UINT8_C(0xF4)
+#define BME280_REG_CONFIG UINT8_C(0xF5)
+#define BME280_REG_DATA UINT8_C(0xF7)
+
+/*! @name Macros related to size */
+#define BME280_LEN_TEMP_PRESS_CALIB_DATA UINT8_C(26)
+#define BME280_LEN_HUMIDITY_CALIB_DATA UINT8_C(7)
+#define BME280_LEN_P_T_H_DATA UINT8_C(8)
+
+/*! @name Sensor power modes */
+#define BME280_POWERMODE_SLEEP UINT8_C(0x00)
+#define BME280_POWERMODE_FORCED UINT8_C(0x01)
+#define BME280_POWERMODE_NORMAL UINT8_C(0x03)
+
+#define BME280_SENSOR_MODE_MSK UINT8_C(0x03)
+#define BME280_SENSOR_MODE_POS UINT8_C(0x00)
+
+/*! @name Soft reset command */
+#define BME280_SOFT_RESET_COMMAND UINT8_C(0xB6)
+
+#define BME280_STATUS_IM_UPDATE UINT8_C(0x01)
+#define BME280_STATUS_MEAS_DONE UINT8_C(0x08)
+
+/*! @name Sensor component selection macros
+ * These values are internal for API implementation. Don't relate this to
+ * data sheet.
+ */
+#define BME280_PRESS UINT8_C(1)
+#define BME280_TEMP UINT8_C(1 << 1)
+#define BME280_HUM UINT8_C(1 << 2)
+#define BME280_ALL UINT8_C(0x07)
+
+/*! @name Settings selection macros */
+#define BME280_SEL_OSR_PRESS UINT8_C(1)
+#define BME280_SEL_OSR_TEMP UINT8_C(1 << 1)
+#define BME280_SEL_OSR_HUM UINT8_C(1 << 2)
+#define BME280_SEL_FILTER UINT8_C(1 << 3)
+#define BME280_SEL_STANDBY UINT8_C(1 << 4)
+#define BME280_SEL_ALL_SETTINGS UINT8_C(0x1F)
+
+/*! @name Oversampling macros */
+#define BME280_NO_OVERSAMPLING UINT8_C(0x00)
+#define BME280_OVERSAMPLING_1X UINT8_C(0x01)
+#define BME280_OVERSAMPLING_2X UINT8_C(0x02)
+#define BME280_OVERSAMPLING_4X UINT8_C(0x03)
+#define BME280_OVERSAMPLING_8X UINT8_C(0x04)
+#define BME280_OVERSAMPLING_16X UINT8_C(0x05)
+#define BME280_OVERSAMPLING_MAX UINT8_C(16)
+
+#define BME280_CTRL_HUM_MSK UINT8_C(0x07)
+#define BME280_CTRL_HUM_POS UINT8_C(0x00)
+#define BME280_CTRL_PRESS_MSK UINT8_C(0x1C)
+#define BME280_CTRL_PRESS_POS UINT8_C(0x02)
+#define BME280_CTRL_TEMP_MSK UINT8_C(0xE0)
+#define BME280_CTRL_TEMP_POS UINT8_C(0x05)
+
+/*! @name Measurement delay calculation macros */
+#define BME280_MEAS_OFFSET UINT16_C(1250)
+#define BME280_MEAS_DUR UINT16_C(2300)
+#define BME280_PRES_HUM_MEAS_OFFSET UINT16_C(575)
+#define BME280_MEAS_SCALING_FACTOR UINT16_C(1000)
+#define BME280_STARTUP_DELAY UINT16_C(2000)
+
+/*! @name Length macros */
+#define BME280_MAX_LEN UINT8_C(10)
+
+/*! @name Standby duration selection macros */
+#define BME280_STANDBY_TIME_0_5_MS (0x00)
+#define BME280_STANDBY_TIME_62_5_MS (0x01)
+#define BME280_STANDBY_TIME_125_MS (0x02)
+#define BME280_STANDBY_TIME_250_MS (0x03)
+#define BME280_STANDBY_TIME_500_MS (0x04)
+#define BME280_STANDBY_TIME_1000_MS (0x05)
+#define BME280_STANDBY_TIME_10_MS (0x06)
+#define BME280_STANDBY_TIME_20_MS (0x07)
+
+#define BME280_STANDBY_MSK UINT8_C(0xE0)
+#define BME280_STANDBY_POS UINT8_C(0x05)
+
+/*! @name Bit shift macros */
+#define BME280_12_BIT_SHIFT UINT8_C(12)
+#define BME280_8_BIT_SHIFT UINT8_C(8)
+#define BME280_4_BIT_SHIFT UINT8_C(4)
+
+/*! @name Filter coefficient selection macros */
+#define BME280_FILTER_COEFF_OFF (0x00)
+#define BME280_FILTER_COEFF_2 (0x01)
+#define BME280_FILTER_COEFF_4 (0x02)
+#define BME280_FILTER_COEFF_8 (0x03)
+#define BME280_FILTER_COEFF_16 (0x04)
+
+#define BME280_FILTER_MSK UINT8_C(0x1C)
+#define BME280_FILTER_POS UINT8_C(0x02)
+
+/*! @name Macro to combine two 8 bit data's to form a 16 bit data */
+#define BME280_CONCAT_BYTES(msb, lsb) (((uint16_t)msb << 8) | (uint16_t)lsb)
+
+/*! @name Macro to SET and GET BITS of a register */
+#define BME280_SET_BITS(reg_data, bitname, data) \
+ ((reg_data & ~(bitname##_MSK)) | \
+ ((data << bitname##_POS) & bitname##_MSK))
+
+#define BME280_SET_BITS_POS_0(reg_data, bitname, data) \
+ ((reg_data & ~(bitname##_MSK)) | \
+ (data & bitname##_MSK))
+
+#define BME280_GET_BITS(reg_data, bitname) ((reg_data & (bitname##_MSK)) >> \
+ (bitname##_POS))
+#define BME280_GET_BITS_POS_0(reg_data, bitname) (reg_data & (bitname##_MSK))
+
+/********************************************************/
+
+/*!
+ * @brief Interface selection Enums
+ */
+enum bme280_intf {
+ /*! SPI interface */
+ BME280_SPI_INTF,
+ /*! I2C interface */
+ BME280_I2C_INTF
+};
+
+/******************************************************************************/
+/*! @name Function Pointers */
+/******************************************************************************/
+
+/*!
+ * @brief Bus communication function pointer which should be mapped to
+ * the platform specific read functions of the user
+ *
+ * @param[in] reg_addr : Register address from which data is read.
+ * @param[out] reg_data : Pointer to data buffer where read data is stored.
+ * @param[in] len : Number of bytes of data to be read.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs.
+ *
+ * @retval 0 -> Success.
+ * @retval Non zero value -> Fail.
+ *
+ */
+typedef BME280_INTF_RET_TYPE (*bme280_read_fptr_t)(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, void *intf_ptr);
+
+/*!
+ * @brief Bus communication function pointer which should be mapped to
+ * the platform specific write functions of the user
+ *
+ * @param[in] reg_addr : Register address to which the data is written.
+ * @param[in] reg_data : Pointer to data buffer in which data to be written
+ * is stored.
+ * @param[in] len : Number of bytes of data to be written.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs
+ *
+ * @retval 0 -> Success.
+ * @retval Non zero value -> Fail.
+ *
+ */
+typedef BME280_INTF_RET_TYPE (*bme280_write_fptr_t)(uint8_t reg_addr, const uint8_t *reg_data, uint32_t len,
+ void *intf_ptr);
+
+/*!
+ * @brief Delay function pointer which should be mapped to
+ * delay function of the user
+ *
+ * @param[in] period : Delay in microseconds.
+ * @param[in, out] intf_ptr : Void pointer that can enable the linking of descriptors
+ * for interface related call backs
+ *
+ */
+typedef void (*bme280_delay_us_fptr_t)(uint32_t period, void *intf_ptr);
+
+/******************************************************************************/
+/*! @name Structure Declarations */
+/******************************************************************************/
+
+/*!
+ * @brief Calibration data
+ */
+struct bme280_calib_data
+{
+ /*! Calibration coefficient for the temperature sensor */
+ uint16_t dig_t1;
+
+ /*! Calibration coefficient for the temperature sensor */
+ int16_t dig_t2;
+
+ /*! Calibration coefficient for the temperature sensor */
+ int16_t dig_t3;
+
+ /*! Calibration coefficient for the pressure sensor */
+ uint16_t dig_p1;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p2;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p3;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p4;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p5;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p6;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p7;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p8;
+
+ /*! Calibration coefficient for the pressure sensor */
+ int16_t dig_p9;
+
+ /*! Calibration coefficient for the humidity sensor */
+ uint8_t dig_h1;
+
+ /*! Calibration coefficient for the humidity sensor */
+ int16_t dig_h2;
+
+ /*! Calibration coefficient for the humidity sensor */
+ uint8_t dig_h3;
+
+ /*! Calibration coefficient for the humidity sensor */
+ int16_t dig_h4;
+
+ /*! Calibration coefficient for the humidity sensor */
+ int16_t dig_h5;
+
+ /*! Calibration coefficient for the humidity sensor */
+ int8_t dig_h6;
+
+ /*! Variable to store the intermediate temperature coefficient */
+ int32_t t_fine;
+};
+
+/*!
+ * @brief bme280 sensor structure which comprises of temperature, pressure and
+ * humidity data
+ */
+#ifdef BME280_DOUBLE_ENABLE
+struct bme280_data
+{
+ /*! Compensated pressure */
+ double pressure;
+
+ /*! Compensated temperature */
+ double temperature;
+
+ /*! Compensated humidity */
+ double humidity;
+};
+#else
+struct bme280_data
+{
+ /*! Compensated pressure */
+ uint32_t pressure;
+
+ /*! Compensated temperature */
+ int32_t temperature;
+
+ /*! Compensated humidity */
+ uint32_t humidity;
+};
+#endif /*! BME280_USE_FLOATING_POINT */
+
+/*!
+ * @brief bme280 sensor structure which comprises of uncompensated temperature,
+ * pressure and humidity data
+ */
+struct bme280_uncomp_data
+{
+ /*! Un-compensated pressure */
+ uint32_t pressure;
+
+ /*! Un-compensated temperature */
+ uint32_t temperature;
+
+ /*! Un-compensated humidity */
+ uint32_t humidity;
+};
+
+/*!
+ * @brief bme280 sensor settings structure which comprises of mode,
+ * oversampling and filter settings.
+ */
+struct bme280_settings
+{
+ /*! Pressure oversampling */
+ uint8_t osr_p;
+
+ /*! Temperature oversampling */
+ uint8_t osr_t;
+
+ /*! Humidity oversampling */
+ uint8_t osr_h;
+
+ /*! Filter coefficient */
+ uint8_t filter;
+
+ /*! Standby time */
+ uint8_t standby_time;
+};
+
+/*!
+ * @brief bme280 device structure
+ */
+struct bme280_dev
+{
+ /*! Chip Id */
+ uint8_t chip_id;
+
+ /*! Interface Selection
+ * For SPI, intf = BME280_SPI_INTF
+ * For I2C, intf = BME280_I2C_INTF
+ */
+ enum bme280_intf intf;
+
+ /*!
+ * The interface pointer is used to enable the user
+ * to link their interface descriptors for reference during the
+ * implementation of the read and write interfaces to the
+ * hardware.
+ */
+ void *intf_ptr;
+
+ /*! Variable to store result of read/write function */
+ BME280_INTF_RET_TYPE intf_rslt;
+
+ /*! Read function pointer */
+ bme280_read_fptr_t read;
+
+ /*! Write function pointer */
+ bme280_write_fptr_t write;
+
+ /*! Delay function pointer */
+ bme280_delay_us_fptr_t delay_us;
+
+ /*! Trim data */
+ struct bme280_calib_data calib_data;
+};
+
+#endif /* _BME280_DEFS_H */
\ No newline at end of file
diff --git a/examples/bme280/bme280_sensor.c b/examples/bme280/bme280_sensor.c
new file mode 100644
index 000000000..600b8cdef
--- /dev/null
+++ b/examples/bme280/bme280_sensor.c
@@ -0,0 +1,132 @@
+#include "bme280_sensor.h"
+
+// system includes
+
+
+// user includes
+#include "bme280_common.h"
+
+
+/**
+ * @brief Required time between measurements
+ *
+ * @see BME280Init
+ */
+static uint32_t period = 0;
+
+/**
+ * @brief Device definition
+ *
+ * @see BME280Init
+ */
+static struct bme280_dev dev;
+
+/**
+ * @brief Device settings
+ *
+ * @see BME280Init
+ */
+static struct bme280_settings settings;
+
+
+BME280Status BME280Init(void) {
+ int8_t rslt;
+
+ /* Interface selection is to be updated as parameter
+ * For I2C : BME280_I2C_INTF
+ * For SPI : BME280_SPI_INTF
+ */
+ rslt = bme280_interface_selection(&dev, BME280_I2C_INTF);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+ // printf("pass 1\n");
+
+ rslt = bme280_init(&dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+ // printf("pass 2\n");
+
+ /* Always read the current settings before writing, especially when all the configuration is not modified */
+ rslt = bme280_get_sensor_settings(&settings, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+ // printf("pass 3\n");
+
+ /* Configuring the over-sampling rate, filter coefficient and standby time */
+ /* Overwrite the desired settings */
+ settings.filter = BME280_FILTER_COEFF_OFF;
+
+ /* Over-sampling rate for humidity, temperature and pressure */
+ settings.osr_h = BME280_OVERSAMPLING_1X;
+ settings.osr_p = BME280_OVERSAMPLING_1X;
+ settings.osr_t = BME280_OVERSAMPLING_1X;
+
+ /* Setting the standby time */
+ settings.standby_time = BME280_STANDBY_TIME_0_5_MS;
+
+ rslt = bme280_set_sensor_settings(BME280_SEL_ALL_SETTINGS, &settings, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+
+ /* Always set the power mode after setting the configuration */
+ rslt = bme280_set_sensor_mode(BME280_POWERMODE_FORCED, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+
+ /* Calculate measurement time in microseconds */
+ rslt = bme280_cal_meas_delay(&period, &settings);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+
+ return rslt;
+}
+
+BME280Status BME280MeasureAll(BME280Data* data) {
+ int8_t rslt = BME280_E_NULL_PTR;
+ uint8_t status_reg;
+
+ // trigger measurement
+ rslt = bme280_set_sensor_mode(BME280_POWERMODE_FORCED, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+
+ // check the status
+ rslt = bme280_get_regs(BME280_REG_STATUS, &status_reg, 1, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+
+ if (status_reg & BME280_STATUS_MEAS_DONE) {
+ /* Measurement time delay given to read sample */
+ dev.delay_us(period, dev.intf_ptr);
+
+ /* Read compensated data */
+ rslt = bme280_get_sensor_data(BME280_ALL, data, &dev);
+ if (rslt != BME280_OK) {
+ return rslt;
+ }
+ }
+
+ // adjust based on defines
+#ifndef BME280_DOUBLE_ENABLE
+/*
+ data->temperature = data->temperature / 100;
+ data->humidity = data->humidity / 1000;
+ */
+ data->temperature = data->temperature;
+ data->humidity = data->humidity;
+#endif
+
+#ifdef BME280_64BIT_ENABLE
+ data->pressure = data->pressure / 100;
+#endif
+
+ return rslt;
+}
diff --git a/examples/bme280/bme280_sensor.h b/examples/bme280/bme280_sensor.h
new file mode 100644
index 000000000..96d32ae4c
--- /dev/null
+++ b/examples/bme280/bme280_sensor.h
@@ -0,0 +1,77 @@
+/**
+ * @file bme280_sensor.h
+ * @author John Madden (jmadden173@pm.me)
+ * @brief Sensor interface for the BME280 sensor
+ * @version 0.1
+ * @date 2024-05-17
+ *
+ * @copyright Copyright (c) 2024
+ *
+ * This is the user code file that allows for interaction with the BME280
+ * sensor. It provides a function for reading each measurement and a function
+ * for a function that can be integrated with the sensors api.
+ *
+ * @see sensors.h
+ */
+
+#ifndef __BME280_SENSOR_H__
+#define __BME280_SENSOR_H__
+
+#include
+#include
+
+//#include "i2c.h"
+//#include "stm32wlxx_hal_i2c.h"
+//#include "stm32wlxx_hal_def.h"
+//#include "stm32_systime.h"
+
+#include "bme280.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Struct to store data from sensor
+ *
+ */
+typedef struct bme280_data BME280Data;
+
+/**
+ * @brief BME280 error codes
+ *
+ * The enum constants are defined to match error codes in bme280_defs.h
+ */
+typedef enum {
+ BME280_STATUS_OK = BME280_OK,
+ BME280_STATUS_NULL_PTR = BME280_E_NULL_PTR,
+ BME280_STATUS_COMM_FAIL = BME280_E_COMM_FAIL,
+ BME280_STATUS_INVALID_LEN = BME280_E_INVALID_LEN,
+ BME280_STATUS_DEV_NOT_FOUND = BME280_E_DEV_NOT_FOUND,
+ BME280_STATUS_SLEEP_MODE_FAIL = BME280_E_SLEEP_MODE_FAIL,
+ BME280_STATUS_NVM_COPY_FAILED = BME280_E_NVM_COPY_FAILED,
+ BME280_STATUS_ERROR = -7
+} BME280Status;
+
+BME280Status BME280Init(void);
+
+BME280Status BME280Deinit(void);
+
+/**
+ * @brief Measures temperature, pressure, and humidity
+ *
+ * If you only need a single measurement channel, take all measurements and only
+ * take the needed measurement. Internally all channels need to be measured to
+ * get the value of a single channel.
+ *
+ * @param data
+ * @return Status code
+ */
+BME280Status BME280MeasureAll(BME280Data *data);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __BME280_H */
\ No newline at end of file
diff --git a/examples/bme280/main.c b/examples/bme280/main.c
new file mode 100644
index 000000000..120d42fe9
--- /dev/null
+++ b/examples/bme280/main.c
@@ -0,0 +1,36 @@
+#include
+#include
+
+#include
+#include
+#include
+
+#include "bme280_sensor.h"
+
+char hello[] = "Hello World!\r\n";
+
+static void nop(
+ returncode_t ret __attribute__((unused)),
+ uint32_t bytes_written __attribute__((unused))) {}
+
+
+int main(void) {
+
+ printf("bme280\n");
+ BME280Status status = BME280Init();
+ while (1) {
+ // Sleep
+ libtocksync_alarm_delay_ms(500);
+
+ BME280Data data = {};
+
+ status = BME280MeasureAll(&data);
+ if (status != BME280_STATUS_OK) {
+ printf("BME280 Error, status: %d\r\n", status);
+ continue;
+ }
+
+ printf("Pressure: %u, Temperature: %d, Humidity: %u\r\n", data.pressure,
+ data.temperature, data.humidity);
+ }
+}