diff options
| author | Daniel Friesel <daniel.friesel@uos.de> | 2019-09-23 12:53:07 +0200 |
|---|---|---|
| committer | Daniel Friesel <daniel.friesel@uos.de> | 2019-09-23 12:53:07 +0200 |
| commit | a5c6adc46d696233bc67e25ac2146173dd6ee8b2 (patch) | |
| tree | c10354d47bf545bfa0a8de5827088032b58f0198 /src/driver | |
| parent | 9fbfe1c5dcb12c47e6a408818dc815e3dd856518 (diff) | |
Add Bosch SensorTec BME680 driver + utilities
Diffstat (limited to 'src/driver')
| -rw-r--r-- | src/driver/bme680.cc | 1367 | ||||
| -rw-r--r-- | src/driver/bme680_util.cc | 27 |
2 files changed, 1394 insertions, 0 deletions
diff --git a/src/driver/bme680.cc b/src/driver/bme680.cc new file mode 100644 index 0000000..9469c8f --- /dev/null +++ b/src/driver/bme680.cc @@ -0,0 +1,1367 @@ +/**\mainpage
+ * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 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.
+ *
+ * Neither the name of the copyright holder nor the names of the
+ * 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 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
+ *
+ * The information provided is believed to be accurate and reliable.
+ * The copyright holder assumes no responsibility
+ * for the consequences of use
+ * of such information nor for any infringement of patents or
+ * other rights of third parties which may result from its use.
+ * No license is granted by implication or otherwise under any patent or
+ * patent rights of the copyright holder.
+ *
+ * File bme680.c
+ * @date 19 Jun 2018
+ * @version 3.5.9
+ *
+ */
+
+/*! @file bme680.c
+ @brief Sensor driver for BME680 sensor */
+#include "driver/bme680.h"
+
+/*!
+ * @brief This internal API is used to read the calibrated data from the sensor.
+ *
+ * This function is used to retrieve the calibration
+ * data from the image registers of the sensor.
+ *
+ * @note Registers 89h to A1h for calibration data 1 to 24
+ * from bit 0 to 7
+ * @note Registers E1h to F0h for calibration data 25 to 40
+ * from bit 0 to 7
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status.
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t get_calib_data(struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to set the gas configuration of the sensor.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status.
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t set_gas_config(struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to get the gas configuration of the sensor.
+ * @note heatr_temp and heatr_dur values are currently register data
+ * and not the actual values set
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status.
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t get_gas_config(struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the Heat duration value.
+ *
+ * @param[in] dur :Value of the duration to be shared.
+ *
+ * @return uint8_t threshold duration after calculation.
+ */
+static uint8_t calc_heater_dur(uint16_t dur);
+
+#ifndef BME680_FLOAT_POINT_COMPENSATION
+
+/*!
+ * @brief This internal API is used to calculate the temperature value.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] temp_adc :Contains the temperature ADC value .
+ *
+ * @return uint32_t calculated temperature.
+ */
+static int16_t calc_temperature(uint32_t temp_adc, struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the pressure value.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] pres_adc :Contains the pressure ADC value .
+ *
+ * @return uint32_t calculated pressure.
+ */
+static uint32_t calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the humidity value.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] hum_adc :Contains the humidity ADC value.
+ *
+ * @return uint32_t calculated humidity.
+ */
+static uint32_t calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the Gas Resistance value.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] gas_res_adc :Contains the Gas Resistance ADC value.
+ * @param[in] gas_range :Contains the range of gas values.
+ *
+ * @return uint32_t calculated gas resistance.
+ */
+static uint32_t calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the Heat Resistance value.
+ *
+ * @param[in] dev : Structure instance of bme680_dev
+ * @param[in] temp : Contains the target temperature value.
+ *
+ * @return uint8_t calculated heater resistance.
+ */
+static uint8_t calc_heater_res(uint16_t temp, const struct bme680_dev *dev);
+
+#else
+/*!
+ * @brief This internal API is used to calculate the
+ * temperature value value in float format
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] temp_adc :Contains the temperature ADC value .
+ *
+ * @return Calculated temperature in float
+ */
+static float calc_temperature(uint32_t temp_adc, struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the
+ * pressure value value in float format
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] pres_adc :Contains the pressure ADC value .
+ *
+ * @return Calculated pressure in float.
+ */
+static float calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the
+ * humidity value value in float format
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] hum_adc :Contains the humidity ADC value.
+ *
+ * @return Calculated humidity in float.
+ */
+static float calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the
+ * gas resistance value value in float format
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] gas_res_adc :Contains the Gas Resistance ADC value.
+ * @param[in] gas_range :Contains the range of gas values.
+ *
+ * @return Calculated gas resistance in float.
+ */
+static float calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to calculate the
+ * heater resistance value in float format
+ *
+ * @param[in] temp : Contains the target temperature value.
+ * @param[in] dev : Structure instance of bme680_dev.
+ *
+ * @return Calculated heater resistance in float.
+ */
+static float calc_heater_res(uint16_t temp, const struct bme680_dev *dev);
+
+#endif
+
+/*!
+ * @brief This internal API is used to calculate the field data of sensor.
+ *
+ * @param[out] data :Structure instance to hold the data
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return int8_t result of the field data from sensor.
+ */
+static int8_t read_field_data(struct bme680_field_data *data, struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to set the memory page
+ * based on register address.
+ *
+ * The value of memory page
+ * value | Description
+ * --------|--------------
+ * 0 | BME680_PAGE0_SPI
+ * 1 | BME680_PAGE1_SPI
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ * @param[in] reg_addr :Contains the register address array.
+ *
+ * @return Result of API execution status
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t set_mem_page(uint8_t reg_addr, struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to get the memory page based
+ * on register address.
+ *
+ * The value of memory page
+ * value | Description
+ * --------|--------------
+ * 0 | BME680_PAGE0_SPI
+ * 1 | BME680_PAGE1_SPI
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t get_mem_page(struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to validate the device pointer for
+ * null conditions.
+ *
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t null_ptr_check(const struct bme680_dev *dev);
+
+/*!
+ * @brief This internal API is used to check the boundary
+ * conditions.
+ *
+ * @param[in] value :pointer to the value.
+ * @param[in] min :minimum value.
+ * @param[in] max :maximum value.
+ * @param[in] dev :Structure instance of bme680_dev.
+ *
+ * @return Result of API execution status
+ * @retval zero -> Success / +ve value -> Warning / -ve value -> Error
+ */
+static int8_t boundary_check(uint8_t *value, uint8_t min, uint8_t max, struct bme680_dev *dev);
+
+/****************** Global Function Definitions *******************************/
+/*!
+ *@brief This API is the entry point.
+ *It reads the chip-id and calibration data from the sensor.
+ */
+int8_t bme680_init(struct bme680_dev *dev)
+{
+ int8_t rslt;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ /* Soft reset to restore it to default values*/
+ rslt = bme680_soft_reset(dev);
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(BME680_CHIP_ID_ADDR, &dev->chip_id, 1, dev);
+ if (rslt == BME680_OK) {
+ if (dev->chip_id == BME680_CHIP_ID) {
+ /* Get the Calibration data */
+ rslt = get_calib_data(dev);
+ } else {
+ rslt = BME680_E_DEV_NOT_FOUND;
+ }
+ }
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API reads the data from the given register address of the sensor.
+ */
+int8_t bme680_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, struct bme680_dev *dev)
+{
+ int8_t rslt;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if (dev->intf == BME680_SPI_INTF) {
+ /* Set the memory page */
+ rslt = set_mem_page(reg_addr, dev);
+ if (rslt == BME680_OK)
+ reg_addr = reg_addr | BME680_SPI_RD_MSK;
+ }
+ dev->com_rslt = dev->read(dev->dev_id, reg_addr, reg_data, len);
+ if (dev->com_rslt != 0)
+ rslt = BME680_E_COM_FAIL;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API writes the given data to the register address
+ * of the sensor.
+ */
+int8_t bme680_set_regs(const uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, struct bme680_dev *dev)
+{
+ int8_t rslt;
+ /* Length of the temporary buffer is 2*(length of register)*/
+ uint8_t tmp_buff[BME680_TMP_BUFFER_LENGTH] = { 0 };
+ uint16_t index;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if ((len > 0) && (len < BME680_TMP_BUFFER_LENGTH / 2)) {
+ /* Interleave the 2 arrays */
+ for (index = 0; index < len; index++) {
+ if (dev->intf == BME680_SPI_INTF) {
+ /* Set the memory page */
+ rslt = set_mem_page(reg_addr[index], dev);
+ tmp_buff[(2 * index)] = reg_addr[index] & BME680_SPI_WR_MSK;
+ } else {
+ tmp_buff[(2 * index)] = reg_addr[index];
+ }
+ tmp_buff[(2 * index) + 1] = reg_data[index];
+ }
+ /* Write the interleaved array */
+ if (rslt == BME680_OK) {
+ dev->com_rslt = dev->write(dev->dev_id, tmp_buff[0], &tmp_buff[1], (2 * len) - 1);
+ if (dev->com_rslt != 0)
+ rslt = BME680_E_COM_FAIL;
+ }
+ } else {
+ rslt = BME680_E_INVALID_LENGTH;
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API performs the soft reset of the sensor.
+ */
+int8_t bme680_soft_reset(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t reg_addr = BME680_SOFT_RESET_ADDR;
+ /* 0xb6 is the soft reset command */
+ uint8_t soft_rst_cmd = BME680_SOFT_RESET_CMD;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if (dev->intf == BME680_SPI_INTF)
+ rslt = get_mem_page(dev);
+
+ /* Reset the device */
+ if (rslt == BME680_OK) {
+ rslt = bme680_set_regs(®_addr, &soft_rst_cmd, 1, dev);
+ /* Wait for 5ms */
+ dev->delay_ms(BME680_RESET_PERIOD);
+
+ if (rslt == BME680_OK) {
+ /* After reset get the memory page */
+ if (dev->intf == BME680_SPI_INTF)
+ rslt = get_mem_page(dev);
+ }
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to set the oversampling, filter and T,P,H, gas selection
+ * settings in the sensor.
+ */
+int8_t bme680_set_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t reg_addr;
+ uint8_t data = 0;
+ uint8_t count = 0;
+ uint8_t reg_array[BME680_REG_BUFFER_LENGTH] = { 0 };
+ uint8_t data_array[BME680_REG_BUFFER_LENGTH] = { 0 };
+ uint8_t intended_power_mode = dev->power_mode; /* Save intended power mode */
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if (desired_settings & BME680_GAS_MEAS_SEL)
+ rslt = set_gas_config(dev);
+
+ dev->power_mode = BME680_SLEEP_MODE;
+ if (rslt == BME680_OK)
+ rslt = bme680_set_sensor_mode(dev);
+
+ /* Selecting the filter */
+ if (desired_settings & BME680_FILTER_SEL) {
+ rslt = boundary_check(&dev->tph_sett.filter, BME680_FILTER_SIZE_0, BME680_FILTER_SIZE_127, dev);
+ reg_addr = BME680_CONF_ODR_FILT_ADDR;
+
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(reg_addr, &data, 1, dev);
+
+ if (desired_settings & BME680_FILTER_SEL)
+ data = BME680_SET_BITS(data, BME680_FILTER, dev->tph_sett.filter);
+
+ reg_array[count] = reg_addr; /* Append configuration */
+ data_array[count] = data;
+ count++;
+ }
+
+ /* Selecting heater control for the sensor */
+ if (desired_settings & BME680_HCNTRL_SEL) {
+ rslt = boundary_check(&dev->gas_sett.heatr_ctrl, BME680_ENABLE_HEATER,
+ BME680_DISABLE_HEATER, dev);
+ reg_addr = BME680_CONF_HEAT_CTRL_ADDR;
+
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(reg_addr, &data, 1, dev);
+ data = BME680_SET_BITS_POS_0(data, BME680_HCTRL, dev->gas_sett.heatr_ctrl);
+
+ reg_array[count] = reg_addr; /* Append configuration */
+ data_array[count] = data;
+ count++;
+ }
+
+ /* Selecting heater T,P oversampling for the sensor */
+ if (desired_settings & (BME680_OST_SEL | BME680_OSP_SEL)) {
+ rslt = boundary_check(&dev->tph_sett.os_temp, BME680_OS_NONE, BME680_OS_16X, dev);
+ reg_addr = BME680_CONF_T_P_MODE_ADDR;
+
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(reg_addr, &data, 1, dev);
+
+ if (desired_settings & BME680_OST_SEL)
+ data = BME680_SET_BITS(data, BME680_OST, dev->tph_sett.os_temp);
+
+ if (desired_settings & BME680_OSP_SEL)
+ data = BME680_SET_BITS(data, BME680_OSP, dev->tph_sett.os_pres);
+
+ reg_array[count] = reg_addr;
+ data_array[count] = data;
+ count++;
+ }
+
+ /* Selecting humidity oversampling for the sensor */
+ if (desired_settings & BME680_OSH_SEL) {
+ rslt = boundary_check(&dev->tph_sett.os_hum, BME680_OS_NONE, BME680_OS_16X, dev);
+ reg_addr = BME680_CONF_OS_H_ADDR;
+
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(reg_addr, &data, 1, dev);
+ data = BME680_SET_BITS_POS_0(data, BME680_OSH, dev->tph_sett.os_hum);
+
+ reg_array[count] = reg_addr; /* Append configuration */
+ data_array[count] = data;
+ count++;
+ }
+
+ /* Selecting the runGas and NB conversion settings for the sensor */
+ if (desired_settings & (BME680_RUN_GAS_SEL | BME680_NBCONV_SEL)) {
+ rslt = boundary_check(&dev->gas_sett.run_gas, BME680_RUN_GAS_DISABLE,
+ BME680_RUN_GAS_ENABLE, dev);
+ if (rslt == BME680_OK) {
+ /* Validate boundary conditions */
+ rslt = boundary_check(&dev->gas_sett.nb_conv, BME680_NBCONV_MIN,
+ BME680_NBCONV_MAX, dev);
+ }
+
+ reg_addr = BME680_CONF_ODR_RUN_GAS_NBC_ADDR;
+
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(reg_addr, &data, 1, dev);
+
+ if (desired_settings & BME680_RUN_GAS_SEL)
+ data = BME680_SET_BITS(data, BME680_RUN_GAS, dev->gas_sett.run_gas);
+
+ if (desired_settings & BME680_NBCONV_SEL)
+ data = BME680_SET_BITS_POS_0(data, BME680_NBCONV, dev->gas_sett.nb_conv);
+
+ reg_array[count] = reg_addr; /* Append configuration */
+ data_array[count] = data;
+ count++;
+ }
+
+ if (rslt == BME680_OK)
+ rslt = bme680_set_regs(reg_array, data_array, count, dev);
+
+ /* Restore previous intended power mode */
+ dev->power_mode = intended_power_mode;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to get the oversampling, filter and T,P,H, gas selection
+ * settings in the sensor.
+ */
+int8_t bme680_get_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev)
+{
+ int8_t rslt;
+ /* starting address of the register array for burst read*/
+ uint8_t reg_addr = BME680_CONF_HEAT_CTRL_ADDR;
+ uint8_t data_array[BME680_REG_BUFFER_LENGTH] = { 0 };
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(reg_addr, data_array, BME680_REG_BUFFER_LENGTH, dev);
+
+ if (rslt == BME680_OK) {
+ if (desired_settings & BME680_GAS_MEAS_SEL)
+ rslt = get_gas_config(dev);
+
+ /* get the T,P,H ,Filter,ODR settings here */
+ if (desired_settings & BME680_FILTER_SEL)
+ dev->tph_sett.filter = BME680_GET_BITS(data_array[BME680_REG_FILTER_INDEX],
+ BME680_FILTER);
+
+ if (desired_settings & (BME680_OST_SEL | BME680_OSP_SEL)) {
+ dev->tph_sett.os_temp = BME680_GET_BITS(data_array[BME680_REG_TEMP_INDEX], BME680_OST);
+ dev->tph_sett.os_pres = BME680_GET_BITS(data_array[BME680_REG_PRES_INDEX], BME680_OSP);
+ }
+
+ if (desired_settings & BME680_OSH_SEL)
+ dev->tph_sett.os_hum = BME680_GET_BITS_POS_0(data_array[BME680_REG_HUM_INDEX],
+ BME680_OSH);
+
+ /* get the gas related settings */
+ if (desired_settings & BME680_HCNTRL_SEL)
+ dev->gas_sett.heatr_ctrl = BME680_GET_BITS_POS_0(data_array[BME680_REG_HCTRL_INDEX],
+ BME680_HCTRL);
+
+ if (desired_settings & (BME680_RUN_GAS_SEL | BME680_NBCONV_SEL)) {
+ dev->gas_sett.nb_conv = BME680_GET_BITS_POS_0(data_array[BME680_REG_NBCONV_INDEX],
+ BME680_NBCONV);
+ dev->gas_sett.run_gas = BME680_GET_BITS(data_array[BME680_REG_RUN_GAS_INDEX],
+ BME680_RUN_GAS);
+ }
+ }
+ } else {
+ rslt = BME680_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to set the power mode of the sensor.
+ */
+int8_t bme680_set_sensor_mode(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t tmp_pow_mode;
+ uint8_t pow_mode = 0;
+ uint8_t reg_addr = BME680_CONF_T_P_MODE_ADDR;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ /* Call repeatedly until in sleep */
+ do {
+ rslt = bme680_get_regs(BME680_CONF_T_P_MODE_ADDR, &tmp_pow_mode, 1, dev);
+ if (rslt == BME680_OK) {
+ /* Put to sleep before changing mode */
+ pow_mode = (tmp_pow_mode & BME680_MODE_MSK);
+
+ if (pow_mode != BME680_SLEEP_MODE) {
+ tmp_pow_mode = tmp_pow_mode & (~BME680_MODE_MSK); /* Set to sleep */
+ rslt = bme680_set_regs(®_addr, &tmp_pow_mode, 1, dev);
+ dev->delay_ms(BME680_POLL_PERIOD_MS);
+ }
+ }
+ } while (pow_mode != BME680_SLEEP_MODE);
+
+ /* Already in sleep */
+ if (dev->power_mode != BME680_SLEEP_MODE) {
+ tmp_pow_mode = (tmp_pow_mode & ~BME680_MODE_MSK) | (dev->power_mode & BME680_MODE_MSK);
+ if (rslt == BME680_OK)
+ rslt = bme680_set_regs(®_addr, &tmp_pow_mode, 1, dev);
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to get the power mode of the sensor.
+ */
+int8_t bme680_get_sensor_mode(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t mode;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(BME680_CONF_T_P_MODE_ADDR, &mode, 1, dev);
+ /* Masking the other register bit info*/
+ dev->power_mode = mode & BME680_MODE_MSK;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This API is used to set the profile duration of the sensor.
+ */
+void bme680_set_profile_dur(uint16_t duration, struct bme680_dev *dev)
+{
+ uint32_t tph_dur; /* Calculate in us */
+ uint32_t meas_cycles;
+ uint8_t os_to_meas_cycles[6] = {0, 1, 2, 4, 8, 16};
+
+ meas_cycles = os_to_meas_cycles[dev->tph_sett.os_temp];
+ meas_cycles += os_to_meas_cycles[dev->tph_sett.os_pres];
+ meas_cycles += os_to_meas_cycles[dev->tph_sett.os_hum];
+
+ /* TPH measurement duration */
+ tph_dur = meas_cycles * UINT32_C(1963);
+ tph_dur += UINT32_C(477 * 4); /* TPH switching duration */
+ tph_dur += UINT32_C(477 * 5); /* Gas measurement duration */
+ tph_dur += UINT32_C(500); /* Get it to the closest whole number.*/
+ tph_dur /= UINT32_C(1000); /* Convert to ms */
+
+ tph_dur += UINT32_C(1); /* Wake up duration of 1ms */
+ /* The remaining time should be used for heating */
+ dev->gas_sett.heatr_dur = duration - (uint16_t) tph_dur;
+}
+
+/*!
+ * @brief This API is used to get the profile duration of the sensor.
+ */
+void bme680_get_profile_dur(uint16_t *duration, const struct bme680_dev *dev)
+{
+ uint32_t tph_dur; /* Calculate in us */
+ uint32_t meas_cycles;
+ uint8_t os_to_meas_cycles[6] = {0, 1, 2, 4, 8, 16};
+
+ meas_cycles = os_to_meas_cycles[dev->tph_sett.os_temp];
+ meas_cycles += os_to_meas_cycles[dev->tph_sett.os_pres];
+ meas_cycles += os_to_meas_cycles[dev->tph_sett.os_hum];
+
+ /* TPH measurement duration */
+ tph_dur = meas_cycles * UINT32_C(1963);
+ tph_dur += UINT32_C(477 * 4); /* TPH switching duration */
+ tph_dur += UINT32_C(477 * 5); /* Gas measurement duration */
+ tph_dur += UINT32_C(500); /* Get it to the closest whole number.*/
+ tph_dur /= UINT32_C(1000); /* Convert to ms */
+
+ tph_dur += UINT32_C(1); /* Wake up duration of 1ms */
+
+ *duration = (uint16_t) tph_dur;
+
+ /* Get the gas duration only when the run gas is enabled */
+ if (dev->gas_sett.run_gas) {
+ /* The remaining time should be used for heating */
+ *duration += dev->gas_sett.heatr_dur;
+ }
+}
+
+/*!
+ * @brief This API reads the pressure, temperature and humidity and gas data
+ * from the sensor, compensates the data and store it in the bme680_data
+ * structure instance passed by the user.
+ */
+int8_t bme680_get_sensor_data(struct bme680_field_data *data, struct bme680_dev *dev)
+{
+ int8_t rslt;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ /* Reading the sensor data in forced mode only */
+ rslt = read_field_data(data, dev);
+ if (rslt == BME680_OK) {
+ if (data->status & BME680_NEW_DATA_MSK)
+ dev->new_fields = 1;
+ else
+ dev->new_fields = 0;
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to read the calibrated data from the sensor.
+ */
+static int8_t get_calib_data(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t coeff_array[BME680_COEFF_SIZE] = { 0 };
+ uint8_t temp_var = 0; /* Temporary variable */
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(BME680_COEFF_ADDR1, coeff_array, BME680_COEFF_ADDR1_LEN, dev);
+ /* Append the second half in the same array */
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(BME680_COEFF_ADDR2, &coeff_array[BME680_COEFF_ADDR1_LEN]
+ , BME680_COEFF_ADDR2_LEN, dev);
+
+ /* Temperature related coefficients */
+ dev->calib.par_t1 = (uint16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_T1_MSB_REG],
+ coeff_array[BME680_T1_LSB_REG]));
+ dev->calib.par_t2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_T2_MSB_REG],
+ coeff_array[BME680_T2_LSB_REG]));
+ dev->calib.par_t3 = (int8_t) (coeff_array[BME680_T3_REG]);
+
+ /* Pressure related coefficients */
+ dev->calib.par_p1 = (uint16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P1_MSB_REG],
+ coeff_array[BME680_P1_LSB_REG]));
+ dev->calib.par_p2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P2_MSB_REG],
+ coeff_array[BME680_P2_LSB_REG]));
+ dev->calib.par_p3 = (int8_t) coeff_array[BME680_P3_REG];
+ dev->calib.par_p4 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P4_MSB_REG],
+ coeff_array[BME680_P4_LSB_REG]));
+ dev->calib.par_p5 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P5_MSB_REG],
+ coeff_array[BME680_P5_LSB_REG]));
+ dev->calib.par_p6 = (int8_t) (coeff_array[BME680_P6_REG]);
+ dev->calib.par_p7 = (int8_t) (coeff_array[BME680_P7_REG]);
+ dev->calib.par_p8 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P8_MSB_REG],
+ coeff_array[BME680_P8_LSB_REG]));
+ dev->calib.par_p9 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P9_MSB_REG],
+ coeff_array[BME680_P9_LSB_REG]));
+ dev->calib.par_p10 = (uint8_t) (coeff_array[BME680_P10_REG]);
+
+ /* Humidity related coefficients */
+ dev->calib.par_h1 = (uint16_t) (((uint16_t) coeff_array[BME680_H1_MSB_REG] << BME680_HUM_REG_SHIFT_VAL)
+ | (coeff_array[BME680_H1_LSB_REG] & BME680_BIT_H1_DATA_MSK));
+ dev->calib.par_h2 = (uint16_t) (((uint16_t) coeff_array[BME680_H2_MSB_REG] << BME680_HUM_REG_SHIFT_VAL)
+ | ((coeff_array[BME680_H2_LSB_REG]) >> BME680_HUM_REG_SHIFT_VAL));
+ dev->calib.par_h3 = (int8_t) coeff_array[BME680_H3_REG];
+ dev->calib.par_h4 = (int8_t) coeff_array[BME680_H4_REG];
+ dev->calib.par_h5 = (int8_t) coeff_array[BME680_H5_REG];
+ dev->calib.par_h6 = (uint8_t) coeff_array[BME680_H6_REG];
+ dev->calib.par_h7 = (int8_t) coeff_array[BME680_H7_REG];
+
+ /* Gas heater related coefficients */
+ dev->calib.par_gh1 = (int8_t) coeff_array[BME680_GH1_REG];
+ dev->calib.par_gh2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_GH2_MSB_REG],
+ coeff_array[BME680_GH2_LSB_REG]));
+ dev->calib.par_gh3 = (int8_t) coeff_array[BME680_GH3_REG];
+
+ /* Other coefficients */
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(BME680_ADDR_RES_HEAT_RANGE_ADDR, &temp_var, 1, dev);
+
+ dev->calib.res_heat_range = ((temp_var & BME680_RHRANGE_MSK) / 16);
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(BME680_ADDR_RES_HEAT_VAL_ADDR, &temp_var, 1, dev);
+
+ dev->calib.res_heat_val = (int8_t) temp_var;
+ if (rslt == BME680_OK)
+ rslt = bme680_get_regs(BME680_ADDR_RANGE_SW_ERR_ADDR, &temp_var, 1, dev);
+ }
+ }
+ dev->calib.range_sw_err = ((int8_t) temp_var & (int8_t) BME680_RSERROR_MSK) / 16;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to set the gas configuration of the sensor.
+ */
+static int8_t set_gas_config(struct bme680_dev *dev)
+{
+ int8_t rslt;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+
+ uint8_t reg_addr[2] = {0};
+ uint8_t reg_data[2] = {0};
+
+ if (dev->power_mode == BME680_FORCED_MODE) {
+ reg_addr[0] = BME680_RES_HEAT0_ADDR;
+ reg_data[0] = calc_heater_res(dev->gas_sett.heatr_temp, dev);
+ reg_addr[1] = BME680_GAS_WAIT0_ADDR;
+ reg_data[1] = calc_heater_dur(dev->gas_sett.heatr_dur);
+ dev->gas_sett.nb_conv = 0;
+ } else {
+ rslt = BME680_W_DEFINE_PWR_MODE;
+ }
+ if (rslt == BME680_OK)
+ rslt = bme680_set_regs(reg_addr, reg_data, 2, dev);
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to get the gas configuration of the sensor.
+ * @note heatr_temp and heatr_dur values are currently register data
+ * and not the actual values set
+ */
+static int8_t get_gas_config(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ /* starting address of the register array for burst read*/
+ uint8_t reg_addr1 = BME680_ADDR_SENS_CONF_START;
+ uint8_t reg_addr2 = BME680_ADDR_GAS_CONF_START;
+ uint8_t reg_data = 0;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if (BME680_SPI_INTF == dev->intf) {
+ /* Memory page switch the SPI address*/
+ rslt = set_mem_page(reg_addr1, dev);
+ }
+
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(reg_addr1, ®_data, 1, dev);
+ if (rslt == BME680_OK) {
+ dev->gas_sett.heatr_temp = reg_data;
+ rslt = bme680_get_regs(reg_addr2, ®_data, 1, dev);
+ if (rslt == BME680_OK) {
+ /* Heating duration register value */
+ dev->gas_sett.heatr_dur = reg_data;
+ }
+ }
+ }
+ }
+
+ return rslt;
+}
+
+#ifndef BME680_FLOAT_POINT_COMPENSATION
+
+/*!
+ * @brief This internal API is used to calculate the temperature value.
+ */
+static int16_t calc_temperature(uint32_t temp_adc, struct bme680_dev *dev)
+{
+ int64_t var1;
+ int64_t var2;
+ int64_t var3;
+ int16_t calc_temp;
+
+ var1 = ((int32_t) temp_adc >> 3) - ((int32_t) dev->calib.par_t1 << 1);
+ var2 = (var1 * (int32_t) dev->calib.par_t2) >> 11;
+ var3 = ((var1 >> 1) * (var1 >> 1)) >> 12;
+ var3 = ((var3) * ((int32_t) dev->calib.par_t3 << 4)) >> 14;
+ dev->calib.t_fine = (int32_t) (var2 + var3);
+ calc_temp = (int16_t) (((dev->calib.t_fine * 5) + 128) >> 8);
+
+ return calc_temp;
+}
+
+/*!
+ * @brief This internal API is used to calculate the pressure value.
+ */
+static uint32_t calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev)
+{
+ int32_t var1;
+ int32_t var2;
+ int32_t var3;
+ int32_t pressure_comp;
+
+ var1 = (((int32_t)dev->calib.t_fine) >> 1) - 64000;
+ var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) *
+ (int32_t)dev->calib.par_p6) >> 2;
+ var2 = var2 + ((var1 * (int32_t)dev->calib.par_p5) << 1);
+ var2 = (var2 >> 2) + ((int32_t)dev->calib.par_p4 << 16);
+ var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
+ ((int32_t)dev->calib.par_p3 << 5)) >> 3) +
+ (((int32_t)dev->calib.par_p2 * var1) >> 1);
+ var1 = var1 >> 18;
+ var1 = ((32768 + var1) * (int32_t)dev->calib.par_p1) >> 15;
+ pressure_comp = 1048576 - pres_adc;
+ pressure_comp = (int32_t)((pressure_comp - (var2 >> 12)) * ((uint32_t)3125));
+ if (pressure_comp >= BME680_MAX_OVERFLOW_VAL)
+ pressure_comp = ((pressure_comp / var1) << 1);
+ else
+ pressure_comp = ((pressure_comp << 1) / var1);
+ var1 = ((int32_t)dev->calib.par_p9 * (int32_t)(((pressure_comp >> 3) *
+ (pressure_comp >> 3)) >> 13)) >> 12;
+ var2 = ((int32_t)(pressure_comp >> 2) *
+ (int32_t)dev->calib.par_p8) >> 13;
+ var3 = ((int32_t)(pressure_comp >> 8) * (int32_t)(pressure_comp >> 8) *
+ (int32_t)(pressure_comp >> 8) *
+ (int32_t)dev->calib.par_p10) >> 17;
+
+ pressure_comp = (int32_t)(pressure_comp) + ((var1 + var2 + var3 +
+ ((int32_t)dev->calib.par_p7 << 7)) >> 4);
+
+ return (uint32_t)pressure_comp;
+
+}
+
+/*!
+ * @brief This internal API is used to calculate the humidity value.
+ */
+static uint32_t calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev)
+{
+ int32_t var1;
+ int32_t var2;
+ int32_t var3;
+ int32_t var4;
+ int32_t var5;
+ int32_t var6;
+ int32_t temp_scaled;
+ int32_t calc_hum;
+
+ temp_scaled = (((int32_t) dev->calib.t_fine * 5) + 128) >> 8;
+ var1 = (int32_t) (hum_adc - ((int32_t) ((int32_t) dev->calib.par_h1 * 16)))
+ - (((temp_scaled * (int32_t) dev->calib.par_h3) / ((int32_t) 100)) >> 1);
+ var2 = ((int32_t) dev->calib.par_h2
+ * (((temp_scaled * (int32_t) dev->calib.par_h4) / ((int32_t) 100))
+ + (((temp_scaled * ((temp_scaled * (int32_t) dev->calib.par_h5) / ((int32_t) 100))) >> 6)
+ / ((int32_t) 100)) + (int32_t) (1 << 14))) >> 10;
+ var3 = var1 * var2;
+ var4 = (int32_t) dev->calib.par_h6 << 7;
+ var4 = ((var4) + ((temp_scaled * (int32_t) dev->calib.par_h7) / ((int32_t) 100))) >> 4;
+ var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
+ var6 = (var4 * var5) >> 1;
+ calc_hum = (((var3 + var6) >> 10) * ((int32_t) 1000)) >> 12;
+
+ if (calc_hum > 100000) /* Cap at 100%rH */
+ calc_hum = 100000;
+ else if (calc_hum < 0)
+ calc_hum = 0;
+
+ return (uint32_t) calc_hum;
+}
+
+/*!
+ * @brief This internal API is used to calculate the Gas Resistance value.
+ */
+static uint32_t calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev)
+{
+ int64_t var1;
+ uint64_t var2;
+ int64_t var3;
+ uint32_t calc_gas_res;
+ /**Look up table 1 for the possible gas range values */
+ uint32_t lookupTable1[16] = { UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647),
+ UINT32_C(2147483647), UINT32_C(2126008810), UINT32_C(2147483647), UINT32_C(2130303777),
+ UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2143188679), UINT32_C(2136746228),
+ UINT32_C(2147483647), UINT32_C(2126008810), UINT32_C(2147483647), UINT32_C(2147483647) };
+ /**Look up table 2 for the possible gas range values */
+ uint32_t lookupTable2[16] = { UINT32_C(4096000000), UINT32_C(2048000000), UINT32_C(1024000000), UINT32_C(512000000),
+ UINT32_C(255744255), UINT32_C(127110228), UINT32_C(64000000), UINT32_C(32258064), UINT32_C(16016016),
+ UINT32_C(8000000), UINT32_C(4000000), UINT32_C(2000000), UINT32_C(1000000), UINT32_C(500000),
+ UINT32_C(250000), UINT32_C(125000) };
+
+ var1 = (int64_t) ((1340 + (5 * (int64_t) dev->calib.range_sw_err)) *
+ ((int64_t) lookupTable1[gas_range])) >> 16;
+ var2 = (((int64_t) ((int64_t) gas_res_adc << 15) - (int64_t) (16777216)) + var1);
+ var3 = (((int64_t) lookupTable2[gas_range] * (int64_t) var1) >> 9);
+ calc_gas_res = (uint32_t) ((var3 + ((int64_t) var2 >> 1)) / (int64_t) var2);
+
+ return calc_gas_res;
+}
+
+/*!
+ * @brief This internal API is used to calculate the Heat Resistance value.
+ */
+static uint8_t calc_heater_res(uint16_t temp, const struct bme680_dev *dev)
+{
+ uint8_t heatr_res;
+ int32_t var1;
+ int32_t var2;
+ int32_t var3;
+ int32_t var4;
+ int32_t var5;
+ int32_t heatr_res_x100;
+
+ if (temp > 400) /* Cap temperature */
+ temp = 400;
+
+ var1 = (((int32_t) dev->amb_temp * dev->calib.par_gh3) / 1000) * 256;
+ var2 = (dev->calib.par_gh1 + 784) * (((((dev->calib.par_gh2 + 154009) * temp * 5) / 100) + 3276800) / 10);
+ var3 = var1 + (var2 / 2);
+ var4 = (var3 / (dev->calib.res_heat_range + 4));
+ var5 = (131 * dev->calib.res_heat_val) + 65536;
+ heatr_res_x100 = (int32_t) (((var4 / var5) - 250) * 34);
+ heatr_res = (uint8_t) ((heatr_res_x100 + 50) / 100);
+
+ return heatr_res;
+}
+
+#else
+
+
+/*!
+ * @brief This internal API is used to calculate the
+ * temperature value in float format
+ */
+static float calc_temperature(uint32_t temp_adc, struct bme680_dev *dev)
+{
+ float var1 = 0;
+ float var2 = 0;
+ float calc_temp = 0;
+
+ /* calculate var1 data */
+ var1 = ((((float)temp_adc / 16384.0f) - ((float)dev->calib.par_t1 / 1024.0f))
+ * ((float)dev->calib.par_t2));
+
+ /* calculate var2 data */
+ var2 = (((((float)temp_adc / 131072.0f) - ((float)dev->calib.par_t1 / 8192.0f)) *
+ (((float)temp_adc / 131072.0f) - ((float)dev->calib.par_t1 / 8192.0f))) *
+ ((float)dev->calib.par_t3 * 16.0f));
+
+ /* t_fine value*/
+ dev->calib.t_fine = (var1 + var2);
+
+ /* compensated temperature data*/
+ calc_temp = ((dev->calib.t_fine) / 5120.0f);
+
+ return calc_temp;
+}
+
+/*!
+ * @brief This internal API is used to calculate the
+ * pressure value in float format
+ */
+static float calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev)
+{
+ float var1 = 0;
+ float var2 = 0;
+ float var3 = 0;
+ float calc_pres = 0;
+
+ var1 = (((float)dev->calib.t_fine / 2.0f) - 64000.0f);
+ var2 = var1 * var1 * (((float)dev->calib.par_p6) / (131072.0f));
+ var2 = var2 + (var1 * ((float)dev->calib.par_p5) * 2.0f);
+ var2 = (var2 / 4.0f) + (((float)dev->calib.par_p4) * 65536.0f);
+ var1 = (((((float)dev->calib.par_p3 * var1 * var1) / 16384.0f)
+ + ((float)dev->calib.par_p2 * var1)) / 524288.0f);
+ var1 = ((1.0f + (var1 / 32768.0f)) * ((float)dev->calib.par_p1));
+ calc_pres = (1048576.0f - ((float)pres_adc));
+
+ /* Avoid exception caused by division by zero */
+ if ((int)var1 != 0) {
+ calc_pres = (((calc_pres - (var2 / 4096.0f)) * 6250.0f) / var1);
+ var1 = (((float)dev->calib.par_p9) * calc_pres * calc_pres) / 2147483648.0f;
+ var2 = calc_pres * (((float)dev->calib.par_p8) / 32768.0f);
+ var3 = ((calc_pres / 256.0f) * (calc_pres / 256.0f) * (calc_pres / 256.0f)
+ * (dev->calib.par_p10 / 131072.0f));
+ calc_pres = (calc_pres + (var1 + var2 + var3 + ((float)dev->calib.par_p7 * 128.0f)) / 16.0f);
+ } else {
+ calc_pres = 0;
+ }
+
+ return calc_pres;
+}
+
+/*!
+ * @brief This internal API is used to calculate the
+ * humidity value in float format
+ */
+static float calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev)
+{
+ float calc_hum = 0;
+ float var1 = 0;
+ float var2 = 0;
+ float var3 = 0;
+ float var4 = 0;
+ float temp_comp;
+
+ /* compensated temperature data*/
+ temp_comp = ((dev->calib.t_fine) / 5120.0f);
+
+ var1 = (float)((float)hum_adc) - (((float)dev->calib.par_h1 * 16.0f) + (((float)dev->calib.par_h3 / 2.0f)
+ * temp_comp));
+
+ var2 = var1 * ((float)(((float) dev->calib.par_h2 / 262144.0f) * (1.0f + (((float)dev->calib.par_h4 / 16384.0f)
+ * temp_comp) + (((float)dev->calib.par_h5 / 1048576.0f) * temp_comp * temp_comp))));
+
+ var3 = (float) dev->calib.par_h6 / 16384.0f;
+
+ var4 = (float) dev->calib.par_h7 / 2097152.0f;
+
+ calc_hum = var2 + ((var3 + (var4 * temp_comp)) * var2 * var2);
+
+ if (calc_hum > 100.0f)
+ calc_hum = 100.0f;
+ else if (calc_hum < 0.0f)
+ calc_hum = 0.0f;
+
+ return calc_hum;
+}
+
+/*!
+ * @brief This internal API is used to calculate the
+ * gas resistance value in float format
+ */
+static float calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev)
+{
+ float calc_gas_res;
+ float var1 = 0;
+ float var2 = 0;
+ float var3 = 0;
+
+ const float lookup_k1_range[16] = {
+ 0.0, 0.0, 0.0, 0.0, 0.0, -1.0, 0.0, -0.8,
+ 0.0, 0.0, -0.2, -0.5, 0.0, -1.0, 0.0, 0.0};
+ const float lookup_k2_range[16] = {
+ 0.0, 0.0, 0.0, 0.0, 0.1, 0.7, 0.0, -0.8,
+ -0.1, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
+
+ var1 = (1340.0f + (5.0f * dev->calib.range_sw_err));
+ var2 = (var1) * (1.0f + lookup_k1_range[gas_range]/100.0f);
+ var3 = 1.0f + (lookup_k2_range[gas_range]/100.0f);
+
+ calc_gas_res = 1.0f / (float)(var3 * (0.000000125f) * (float)(1 << gas_range) * (((((float)gas_res_adc)
+ - 512.0f)/var2) + 1.0f));
+
+ return calc_gas_res;
+}
+
+/*!
+ * @brief This internal API is used to calculate the
+ * heater resistance value in float format
+ */
+static float calc_heater_res(uint16_t temp, const struct bme680_dev *dev)
+{
+ float var1 = 0;
+ float var2 = 0;
+ float var3 = 0;
+ float var4 = 0;
+ float var5 = 0;
+ float res_heat = 0;
+
+ if (temp > 400) /* Cap temperature */
+ temp = 400;
+
+ var1 = (((float)dev->calib.par_gh1 / (16.0f)) + 49.0f);
+ var2 = ((((float)dev->calib.par_gh2 / (32768.0f)) * (0.0005f)) + 0.00235f);
+ var3 = ((float)dev->calib.par_gh3 / (1024.0f));
+ var4 = (var1 * (1.0f + (var2 * (float)temp)));
+ var5 = (var4 + (var3 * (float)dev->amb_temp));
+ res_heat = (uint8_t)(3.4f * ((var5 * (4 / (4 + (float)dev->calib.res_heat_range)) *
+ (1/(1 + ((float) dev->calib.res_heat_val * 0.002f)))) - 25));
+
+ return res_heat;
+}
+
+#endif
+
+/*!
+ * @brief This internal API is used to calculate the Heat duration value.
+ */
+static uint8_t calc_heater_dur(uint16_t dur)
+{
+ uint8_t factor = 0;
+ uint8_t durval;
+
+ if (dur >= 0xfc0) {
+ durval = 0xff; /* Max duration*/
+ } else {
+ while (dur > 0x3F) {
+ dur = dur / 4;
+ factor += 1;
+ }
+ durval = (uint8_t) (dur + (factor * 64));
+ }
+
+ return durval;
+}
+
+/*!
+ * @brief This internal API is used to calculate the field data of sensor.
+ */
+static int8_t read_field_data(struct bme680_field_data *data, struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t buff[BME680_FIELD_LENGTH] = { 0 };
+ uint8_t gas_range;
+ uint32_t adc_temp;
+ uint32_t adc_pres;
+ uint16_t adc_hum;
+ uint16_t adc_gas_res;
+ uint8_t tries = 10;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ do {
+ if (rslt == BME680_OK) {
+ rslt = bme680_get_regs(((uint8_t) (BME680_FIELD0_ADDR)), buff, (uint16_t) BME680_FIELD_LENGTH,
+ dev);
+
+ data->status = buff[0] & BME680_NEW_DATA_MSK;
+ data->gas_index = buff[0] & BME680_GAS_INDEX_MSK;
+ data->meas_index = buff[1];
+
+ /* read the raw data from the sensor */
+ adc_pres = (uint32_t) (((uint32_t) buff[2] * 4096) | ((uint32_t) buff[3] * 16)
+ | ((uint32_t) buff[4] / 16));
+ adc_temp = (uint32_t) (((uint32_t) buff[5] * 4096) | ((uint32_t) buff[6] * 16)
+ | ((uint32_t) buff[7] / 16));
+ adc_hum = (uint16_t) (((uint32_t) buff[8] * 256) | (uint32_t) buff[9]);
+ adc_gas_res = (uint16_t) ((uint32_t) buff[13] * 4 | (((uint32_t) buff[14]) / 64));
+ gas_range = buff[14] & BME680_GAS_RANGE_MSK;
+
+ data->status |= buff[14] & BME680_GASM_VALID_MSK;
+ data->status |= buff[14] & BME680_HEAT_STAB_MSK;
+
+ if (data->status & BME680_NEW_DATA_MSK) {
+ data->temperature = calc_temperature(adc_temp, dev);
+ data->pressure = calc_pressure(adc_pres, dev);
+ data->humidity = calc_humidity(adc_hum, dev);
+ data->gas_resistance = calc_gas_resistance(adc_gas_res, gas_range, dev);
+ break;
+ }
+ /* Delay to poll the data */
+ dev->delay_ms(BME680_POLL_PERIOD_MS);
+ }
+ tries--;
+ } while (tries);
+
+ if (!tries)
+ rslt = BME680_W_NO_NEW_DATA;
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to set the memory page based on register address.
+ */
+static int8_t set_mem_page(uint8_t reg_addr, struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t reg;
+ uint8_t mem_page;
+
+ /* Check for null pointers in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ if (reg_addr > 0x7f)
+ mem_page = BME680_MEM_PAGE1;
+ else
+ mem_page = BME680_MEM_PAGE0;
+
+ if (mem_page != dev->mem_page) {
+ dev->mem_page = mem_page;
+
+ dev->com_rslt = dev->read(dev->dev_id, BME680_MEM_PAGE_ADDR | BME680_SPI_RD_MSK, ®, 1);
+ if (dev->com_rslt != 0)
+ rslt = BME680_E_COM_FAIL;
+
+ if (rslt == BME680_OK) {
+ reg = reg & (~BME680_MEM_PAGE_MSK);
+ reg = reg | (dev->mem_page & BME680_MEM_PAGE_MSK);
+
+ dev->com_rslt = dev->write(dev->dev_id, BME680_MEM_PAGE_ADDR & BME680_SPI_WR_MSK,
+ ®, 1);
+ if (dev->com_rslt != 0)
+ rslt = BME680_E_COM_FAIL;
+ }
+ }
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to get the memory page based on register address.
+ */
+static int8_t get_mem_page(struct bme680_dev *dev)
+{
+ int8_t rslt;
+ uint8_t reg;
+
+ /* Check for null pointer in the device structure*/
+ rslt = null_ptr_check(dev);
+ if (rslt == BME680_OK) {
+ dev->com_rslt = dev->read(dev->dev_id, BME680_MEM_PAGE_ADDR | BME680_SPI_RD_MSK, ®, 1);
+ if (dev->com_rslt != 0)
+ rslt = BME680_E_COM_FAIL;
+ else
+ dev->mem_page = reg & BME680_MEM_PAGE_MSK;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to validate the boundary
+ * conditions.
+ */
+static int8_t boundary_check(uint8_t *value, uint8_t min, uint8_t max, struct bme680_dev *dev)
+{
+ int8_t rslt = BME680_OK;
+
+ if (value != NULL) {
+ /* Check if value is below minimum value */
+ if (*value < min) {
+ /* Auto correct the invalid value to minimum value */
+ *value = min;
+ dev->info_msg |= BME680_I_MIN_CORRECTION;
+ }
+ /* Check if value is above maximum value */
+ if (*value > max) {
+ /* Auto correct the invalid value to maximum value */
+ *value = max;
+ dev->info_msg |= BME680_I_MAX_CORRECTION;
+ }
+ } else {
+ rslt = BME680_E_NULL_PTR;
+ }
+
+ return rslt;
+}
+
+/*!
+ * @brief This internal API is used to validate the device structure pointer for
+ * null conditions.
+ */
+static int8_t null_ptr_check(const struct bme680_dev *dev)
+{
+ int8_t rslt;
+
+ if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL)) {
+ /* Device structure pointer is not valid */
+ rslt = BME680_E_NULL_PTR;
+ } else {
+ /* Device structure is fine */
+ rslt = BME680_OK;
+ }
+
+ return rslt;
+}
diff --git a/src/driver/bme680_util.cc b/src/driver/bme680_util.cc new file mode 100644 index 0000000..cb9b529 --- /dev/null +++ b/src/driver/bme680_util.cc @@ -0,0 +1,27 @@ +#include "arch.h" +#include "driver/i2c.h" +#include <stdint.h> + +void bme680_delay_ms(uint32_t const period) +{ + arch.delay_ms(period); +} + +int8_t bme680_i2c_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + int8_t ret = i2c.xmit(dev_id, 1, ®_addr, 0, 0); + if (ret) { + return ret; + } + return i2c.xmit(dev_id, 0, 0, len, reg_data); +} + +int8_t bme680_i2c_write(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + unsigned char txbuf[len+1]; + txbuf[0] = reg_addr; + for (uint16_t i = 0; i < len; i++) { + txbuf[i+1] = reg_data[i]; + } + return i2c.xmit(dev_id, len + 1, txbuf, 0, 0); +} |