bme68x_defs.h

/**
* Copyright (c) 2023 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       bme68x_defs.h
* @date       2023-02-07
* @version    v4.4.8
*
*/

/*! @cond DOXYGEN_SUPRESS */

#ifndef BME68X_DEFS_H_
#define BME68X_DEFS_H_

/********************************************************* */
/*!             Header includes                           */
/********************************************************* */
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/kernel.h>
#else
#include <stdint.h>
#include <stddef.h>
#endif

/********************************************************* */
/*!               Common Macros                           */
/********************************************************* */
#ifdef __KERNEL__
#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
#endif

/*! C standard macros */
#ifndef NULL
#ifdef __cplusplus
#define NULL         0
#else
#define NULL         ((void *) 0)
#endif
#endif

#ifndef BME68X_DO_NOT_USE_FPU

/* Comment or un-comment the macro to provide floating point data output */
#define BME68X_USE_FPU
#endif

/* Period between two polls (value can be given by user) */
#ifndef BME68X_PERIOD_POLL
#define BME68X_PERIOD_POLL                        UINT32_C(10000)
#endif

/* BME68X unique chip identifier */
#define BME68X_CHIP_ID                            UINT8_C(0x61)

/* Period for a soft reset */
#define BME68X_PERIOD_RESET                       UINT32_C(10000)

/* BME68X lower I2C address */
#define BME68X_I2C_ADDR_LOW                       UINT8_C(0x76)

/* BME68X higher I2C address */
#define BME68X_I2C_ADDR_HIGH                      UINT8_C(0x77)

/* Soft reset command */
#define BME68X_SOFT_RESET_CMD                     UINT8_C(0xb6)

/* Return code definitions */
/* Success */
#define BME68X_OK                                 INT8_C(0)

/* Errors */
/* Null pointer passed */
#define BME68X_E_NULL_PTR                         INT8_C(-1)

/* Communication failure */
#define BME68X_E_COM_FAIL                         INT8_C(-2)

/* Sensor not found */
#define BME68X_E_DEV_NOT_FOUND                    INT8_C(-3)

/* Incorrect length parameter */
#define BME68X_E_INVALID_LENGTH                   INT8_C(-4)

/* Self test fail error */
#define BME68X_E_SELF_TEST                        INT8_C(-5)

/* Warnings */
/* Define a valid operation mode */
#define BME68X_W_DEFINE_OP_MODE                   INT8_C(1)

/* No new data was found */
#define BME68X_W_NO_NEW_DATA                      INT8_C(2)

/* Define the shared heating duration */
#define BME68X_W_DEFINE_SHD_HEATR_DUR             INT8_C(3)

/* Information - only available via bme68x_dev.info_msg */
#define BME68X_I_PARAM_CORR                       UINT8_C(1)

/* Register map addresses in I2C */
/* Register for 3rd group of coefficients */
#define BME68X_REG_COEFF3                         UINT8_C(0x00)

/* 0th Field address*/
#define BME68X_REG_FIELD0                         UINT8_C(0x1d)

/* 0th Current DAC address*/
#define BME68X_REG_IDAC_HEAT0                     UINT8_C(0x50)

/* 0th Res heat address */
#define BME68X_REG_RES_HEAT0                      UINT8_C(0x5a)

/* 0th Gas wait address */
#define BME68X_REG_GAS_WAIT0                      UINT8_C(0x64)

/* Shared heating duration address */
#define BME68X_REG_SHD_HEATR_DUR                  UINT8_C(0x6E)

/* CTRL_GAS_0 address */
#define BME68X_REG_CTRL_GAS_0                     UINT8_C(0x70)

/* CTRL_GAS_1 address */
#define BME68X_REG_CTRL_GAS_1                     UINT8_C(0x71)

/* CTRL_HUM address */
#define BME68X_REG_CTRL_HUM                       UINT8_C(0x72)

/* CTRL_MEAS address */
#define BME68X_REG_CTRL_MEAS                      UINT8_C(0x74)

/* CONFIG address */
#define BME68X_REG_CONFIG                         UINT8_C(0x75)

/* MEM_PAGE address */
#define BME68X_REG_MEM_PAGE                       UINT8_C(0xf3)

/* Unique ID address */
#define BME68X_REG_UNIQUE_ID                      UINT8_C(0x83)

/* Register for 1st group of coefficients */
#define BME68X_REG_COEFF1                         UINT8_C(0x8a)

/* Chip ID address */
#define BME68X_REG_CHIP_ID                        UINT8_C(0xd0)

/* Soft reset address */
#define BME68X_REG_SOFT_RESET                     UINT8_C(0xe0)

/* Register for 2nd group of coefficients */
#define BME68X_REG_COEFF2                         UINT8_C(0xe1)

/* Variant ID Register */
#define BME68X_REG_VARIANT_ID                     UINT8_C(0xF0)

/* Enable/Disable macros */

/* Enable */
#define BME68X_ENABLE                             UINT8_C(0x01)

/* Disable */
#define BME68X_DISABLE                            UINT8_C(0x00)

/* Variant ID macros */

/* Low Gas variant */
#define BME68X_VARIANT_GAS_LOW                    UINT8_C(0x00)

/* High Gas variant */
#define BME68X_VARIANT_GAS_HIGH                   UINT8_C(0x01)

/* Oversampling setting macros */

/* Switch off measurement */
#define BME68X_OS_NONE                            UINT8_C(0)

/* Perform 1 measurement */
#define BME68X_OS_1X                              UINT8_C(1)

/* Perform 2 measurements */
#define BME68X_OS_2X                              UINT8_C(2)

/* Perform 4 measurements */
#define BME68X_OS_4X                              UINT8_C(3)

/* Perform 8 measurements */
#define BME68X_OS_8X                              UINT8_C(4)

/* Perform 16 measurements */
#define BME68X_OS_16X                             UINT8_C(5)

/* IIR Filter settings */

/* Switch off the filter */
#define BME68X_FILTER_OFF                         UINT8_C(0)

/* Filter coefficient of 2 */
#define BME68X_FILTER_SIZE_1                      UINT8_C(1)

/* Filter coefficient of 4 */
#define BME68X_FILTER_SIZE_3                      UINT8_C(2)

/* Filter coefficient of 8 */
#define BME68X_FILTER_SIZE_7                      UINT8_C(3)

/* Filter coefficient of 16 */
#define BME68X_FILTER_SIZE_15                     UINT8_C(4)

/* Filter coefficient of 32 */
#define BME68X_FILTER_SIZE_31                     UINT8_C(5)

/* Filter coefficient of 64 */
#define BME68X_FILTER_SIZE_63                     UINT8_C(6)

/* Filter coefficient of 128 */
#define BME68X_FILTER_SIZE_127                    UINT8_C(7)

/* ODR/Standby time macros */

/* Standby time of 0.59ms */
#define BME68X_ODR_0_59_MS                        UINT8_C(0)

/* Standby time of 62.5ms */
#define BME68X_ODR_62_5_MS                        UINT8_C(1)

/* Standby time of 125ms */
#define BME68X_ODR_125_MS                         UINT8_C(2)

/* Standby time of 250ms */
#define BME68X_ODR_250_MS                         UINT8_C(3)

/* Standby time of 500ms */
#define BME68X_ODR_500_MS                         UINT8_C(4)

/* Standby time of 1s */
#define BME68X_ODR_1000_MS                        UINT8_C(5)

/* Standby time of 10ms */
#define BME68X_ODR_10_MS                          UINT8_C(6)

/* Standby time of 20ms */
#define BME68X_ODR_20_MS                          UINT8_C(7)

/* No standby time */
#define BME68X_ODR_NONE                           UINT8_C(8)

/* Operating mode macros */

/* Sleep operation mode */
#define BME68X_SLEEP_MODE                         UINT8_C(0)

/* Forced operation mode */
#define BME68X_FORCED_MODE                        UINT8_C(1)

/* Parallel operation mode */
#define BME68X_PARALLEL_MODE                      UINT8_C(2)

/* Sequential operation mode */
#define BME68X_SEQUENTIAL_MODE                    UINT8_C(3)

/* SPI page macros */

/* SPI memory page 0 */
#define BME68X_MEM_PAGE0                          UINT8_C(0x10)

/* SPI memory page 1 */
#define BME68X_MEM_PAGE1                          UINT8_C(0x00)

/* Coefficient index macros */

/* Length for all coefficients */
#define BME68X_LEN_COEFF_ALL                      UINT8_C(42)

/* Length for 1st group of coefficients */
#define BME68X_LEN_COEFF1                         UINT8_C(23)

/* Length for 2nd group of coefficients */
#define BME68X_LEN_COEFF2                         UINT8_C(14)

/* Length for 3rd group of coefficients */
#define BME68X_LEN_COEFF3                         UINT8_C(5)

/* Length of the field */
#define BME68X_LEN_FIELD                          UINT8_C(17)

/* Length between two fields */
#define BME68X_LEN_FIELD_OFFSET                   UINT8_C(17)

/* Length of the configuration register */
#define BME68X_LEN_CONFIG                         UINT8_C(5)

/* Length of the interleaved buffer */
#define BME68X_LEN_INTERLEAVE_BUFF                UINT8_C(20)

/* Coefficient index macros */

/* Coefficient T2 LSB position */
#define BME68X_IDX_T2_LSB                         (0)

/* Coefficient T2 MSB position */
#define BME68X_IDX_T2_MSB                         (1)

/* Coefficient T3 position */
#define BME68X_IDX_T3                             (2)

/* Coefficient P1 LSB position */
#define BME68X_IDX_P1_LSB                         (4)

/* Coefficient P1 MSB position */
#define BME68X_IDX_P1_MSB                         (5)

/* Coefficient P2 LSB position */
#define BME68X_IDX_P2_LSB                         (6)

/* Coefficient P2 MSB position */
#define BME68X_IDX_P2_MSB                         (7)

/* Coefficient P3 position */
#define BME68X_IDX_P3                             (8)

/* Coefficient P4 LSB position */
#define BME68X_IDX_P4_LSB                         (10)

/* Coefficient P4 MSB position */
#define BME68X_IDX_P4_MSB                         (11)

/* Coefficient P5 LSB position */
#define BME68X_IDX_P5_LSB                         (12)

/* Coefficient P5 MSB position */
#define BME68X_IDX_P5_MSB                         (13)

/* Coefficient P7 position */
#define BME68X_IDX_P7                             (14)

/* Coefficient P6 position */
#define BME68X_IDX_P6                             (15)

/* Coefficient P8 LSB position */
#define BME68X_IDX_P8_LSB                         (18)

/* Coefficient P8 MSB position */
#define BME68X_IDX_P8_MSB                         (19)

/* Coefficient P9 LSB position */
#define BME68X_IDX_P9_LSB                         (20)

/* Coefficient P9 MSB position */
#define BME68X_IDX_P9_MSB                         (21)

/* Coefficient P10 position */
#define BME68X_IDX_P10                            (22)

/* Coefficient H2 MSB position */
#define BME68X_IDX_H2_MSB                         (23)

/* Coefficient H2 LSB position */
#define BME68X_IDX_H2_LSB                         (24)

/* Coefficient H1 LSB position */
#define BME68X_IDX_H1_LSB                         (24)

/* Coefficient H1 MSB position */
#define BME68X_IDX_H1_MSB                         (25)

/* Coefficient H3 position */
#define BME68X_IDX_H3                             (26)

/* Coefficient H4 position */
#define BME68X_IDX_H4                             (27)

/* Coefficient H5 position */
#define BME68X_IDX_H5                             (28)

/* Coefficient H6 position */
#define BME68X_IDX_H6                             (29)

/* Coefficient H7 position */
#define BME68X_IDX_H7                             (30)

/* Coefficient T1 LSB position */
#define BME68X_IDX_T1_LSB                         (31)

/* Coefficient T1 MSB position */
#define BME68X_IDX_T1_MSB                         (32)

/* Coefficient GH2 LSB position */
#define BME68X_IDX_GH2_LSB                        (33)

/* Coefficient GH2 MSB position */
#define BME68X_IDX_GH2_MSB                        (34)

/* Coefficient GH1 position */
#define BME68X_IDX_GH1                            (35)

/* Coefficient GH3 position */
#define BME68X_IDX_GH3                            (36)

/* Coefficient res heat value position */
#define BME68X_IDX_RES_HEAT_VAL                   (37)

/* Coefficient res heat range position */
#define BME68X_IDX_RES_HEAT_RANGE                 (39)

/* Coefficient range switching error position */
#define BME68X_IDX_RANGE_SW_ERR                   (41)

/* Gas measurement macros */

/* Disable gas measurement */
#define BME68X_DISABLE_GAS_MEAS                   UINT8_C(0x00)

/* Enable gas measurement low */
#define BME68X_ENABLE_GAS_MEAS_L                  UINT8_C(0x01)

/* Enable gas measurement high */
#define BME68X_ENABLE_GAS_MEAS_H                  UINT8_C(0x02)

/* Heater control macros */

/* Enable heater */
#define BME68X_ENABLE_HEATER                      UINT8_C(0x00)

/* Disable heater */
#define BME68X_DISABLE_HEATER                     UINT8_C(0x01)

#ifdef BME68X_USE_FPU

/* 0 degree Celsius */
#define BME68X_MIN_TEMPERATURE                    INT16_C(0)

/* 60 degree Celsius */
#define BME68X_MAX_TEMPERATURE                    INT16_C(60)

/* 900 hecto Pascals */
#define BME68X_MIN_PRESSURE                       UINT32_C(90000)

/* 1100 hecto Pascals */
#define BME68X_MAX_PRESSURE                       UINT32_C(110000)

/* 20% relative humidity */
#define BME68X_MIN_HUMIDITY                       UINT32_C(20)

/* 80% relative humidity*/
#define BME68X_MAX_HUMIDITY                       UINT32_C(80)
#else

/* 0 degree Celsius */
#define BME68X_MIN_TEMPERATURE                    INT16_C(0)

/* 60 degree Celsius */
#define BME68X_MAX_TEMPERATURE                    INT16_C(6000)

/* 900 hecto Pascals */
#define BME68X_MIN_PRESSURE                       UINT32_C(90000)

/* 1100 hecto Pascals */
#define BME68X_MAX_PRESSURE                       UINT32_C(110000)

/* 20% relative humidity */
#define BME68X_MIN_HUMIDITY                       UINT32_C(20000)

/* 80% relative humidity*/
#define BME68X_MAX_HUMIDITY                       UINT32_C(80000)

#endif

#define BME68X_HEATR_DUR1                         UINT16_C(1000)
#define BME68X_HEATR_DUR2                         UINT16_C(2000)
#define BME68X_HEATR_DUR1_DELAY                   UINT32_C(1000000)
#define BME68X_HEATR_DUR2_DELAY                   UINT32_C(2000000)
#define BME68X_N_MEAS                             UINT8_C(6)
#define BME68X_LOW_TEMP                           UINT8_C(150)
#define BME68X_HIGH_TEMP                          UINT16_C(350)

/* Mask macros */
/* Mask for number of conversions */
#define BME68X_NBCONV_MSK                         UINT8_C(0X0f)

/* Mask for IIR filter */
#define BME68X_FILTER_MSK                         UINT8_C(0X1c)

/* Mask for ODR[3] */
#define BME68X_ODR3_MSK                           UINT8_C(0x80)

/* Mask for ODR[2:0] */
#define BME68X_ODR20_MSK                          UINT8_C(0xe0)

/* Mask for temperature oversampling */
#define BME68X_OST_MSK                            UINT8_C(0Xe0)

/* Mask for pressure oversampling */
#define BME68X_OSP_MSK                            UINT8_C(0X1c)

/* Mask for humidity oversampling */
#define BME68X_OSH_MSK                            UINT8_C(0X07)

/* Mask for heater control */
#define BME68X_HCTRL_MSK                          UINT8_C(0x08)

/* Mask for run gas */
#define BME68X_RUN_GAS_MSK                        UINT8_C(0x30)

/* Mask for operation mode */
#define BME68X_MODE_MSK                           UINT8_C(0x03)

/* Mask for res heat range */
#define BME68X_RHRANGE_MSK                        UINT8_C(0x30)

/* Mask for range switching error */
#define BME68X_RSERROR_MSK                        UINT8_C(0xf0)

/* Mask for new data */
#define BME68X_NEW_DATA_MSK                       UINT8_C(0x80)

/* Mask for gas index */
#define BME68X_GAS_INDEX_MSK                      UINT8_C(0x0f)

/* Mask for gas range */
#define BME68X_GAS_RANGE_MSK                      UINT8_C(0x0f)

/* Mask for gas measurement valid */
#define BME68X_GASM_VALID_MSK                     UINT8_C(0x20)

/* Mask for heater stability */
#define BME68X_HEAT_STAB_MSK                      UINT8_C(0x10)

/* Mask for SPI memory page */
#define BME68X_MEM_PAGE_MSK                       UINT8_C(0x10)

/* Mask for reading a register in SPI */
#define BME68X_SPI_RD_MSK                         UINT8_C(0x80)

/* Mask for writing a register in SPI */
#define BME68X_SPI_WR_MSK                         UINT8_C(0x7f)

/* Mask for the H1 calibration coefficient */
#define BME68X_BIT_H1_DATA_MSK                    UINT8_C(0x0f)

/* Position macros */

/* Filter bit position */
#define BME68X_FILTER_POS                         UINT8_C(2)

/* Temperature oversampling bit position */
#define BME68X_OST_POS                            UINT8_C(5)

/* Pressure oversampling bit position */
#define BME68X_OSP_POS                            UINT8_C(2)

/* ODR[3] bit position */
#define BME68X_ODR3_POS                           UINT8_C(7)

/* ODR[2:0] bit position */
#define BME68X_ODR20_POS                          UINT8_C(5)

/* Run gas bit position */
#define BME68X_RUN_GAS_POS                        UINT8_C(4)

/* Heater control bit position */
#define BME68X_HCTRL_POS                          UINT8_C(3)

/* Macro to combine two 8 bit data's to form a 16 bit data */
#define BME68X_CONCAT_BYTES(msb, lsb)             (((uint16_t)msb << 8) | (uint16_t)lsb)

/* Macro to set bits */
#define BME68X_SET_BITS(reg_data, bitname, data) \
    ((reg_data & ~(bitname##_MSK)) | \
     ((data << bitname##_POS) & bitname##_MSK))

/* Macro to get bits */
#define BME68X_GET_BITS(reg_data, bitname)        ((reg_data & (bitname##_MSK)) >> \
                                                   (bitname##_POS))

/* Macro to set bits starting from position 0 */
#define BME68X_SET_BITS_POS_0(reg_data, bitname, data) \
    ((reg_data & ~(bitname##_MSK)) | \
     (data & bitname##_MSK))

/* Macro to get bits starting from position 0 */
#define BME68X_GET_BITS_POS_0(reg_data, bitname)  (reg_data & (bitname##_MSK))

/**
 * BME68X_INTF_RET_TYPE is the read/write interface return type which can be overwritten by the build system.
 * The default is set to int8_t.
 */
#ifndef BME68X_INTF_RET_TYPE
#define BME68X_INTF_RET_TYPE                      int8_t
#endif

/**
 * BME68X_INTF_RET_SUCCESS is the success return value read/write interface return type which can be
 * overwritten by the build system. The default is set to 0. It is used to check for a successful
 * execution of the read/write functions
 */
#ifndef BME68X_INTF_RET_SUCCESS
#define BME68X_INTF_RET_SUCCESS                   INT8_C(0)
#endif

/********************************************************* */
/*!               Function Pointers                       */
/********************************************************* */

/*!
 * @brief Bus communication function pointer which should be mapped to
 * the platform specific read functions of the user
 *
 * @param[in]     reg_addr : 8bit register address of the sensor
 * @param[out]    reg_data : Data from the specified address
 * @param[in]     length   : Length of the reg_data array
 * @param[in,out] intf_ptr : Void pointer that can enable the linking of descriptors
 *                           for interface related callbacks
 * @retval 0 for Success
 * @retval Non-zero for Failure
 */
typedef BME68X_INTF_RET_TYPE (*bme68x_read_fptr_t)(uint8_t reg_addr, uint8_t *reg_data, uint32_t length,
                                                   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 : 8bit register address of the sensor
 * @param[out]    reg_data : Data to the specified address
 * @param[in]     length   : Length of the reg_data array
 * @param[in,out] intf_ptr : Void pointer that can enable the linking of descriptors
 *                           for interface related callbacks
 * @retval 0 for Success
 * @retval Non-zero for Failure
 *
 */
typedef BME68X_INTF_RET_TYPE (*bme68x_write_fptr_t)(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length,
                                                    void *intf_ptr);

/*!
 * @brief Delay function pointer which should be mapped to
 * delay function of the user
 *
 * @param period - The time period in microseconds
 * @param[in,out] intf_ptr : Void pointer that can enable the linking of descriptors
 *                           for interface related callbacks
 */
typedef void (*bme68x_delay_us_fptr_t)(uint32_t period, void *intf_ptr);

/*
 * @brief Generic communication function pointer
 * @param[in] dev_id: Place holder to store the id of the device structure
 *                    Can be used to store the index of the Chip select or
 *                    I2C address of the device.
 * @param[in] reg_addr: Used to select the register the where data needs to
 *                      be read from or written to.
 * @param[in,out] reg_data: Data array to read/write
 * @param[in] len: Length of the data array
 */

/*
 * @brief Interface selection Enumerations
 */
enum bme68x_intf {
    /*! SPI interface */
    BME68X_SPI_INTF,
    /*! I2C interface */
    BME68X_I2C_INTF
};

/* Structure definitions */

/*
 * @brief Sensor field data structure
 */
struct bme68x_data
{
    /*! Contains new_data, gasm_valid & heat_stab */
    uint8_t status;

    /*! The index of the heater profile used */
    uint8_t gas_index;

    /*! Measurement index to track order */
    uint8_t meas_index;

    /*! Heater resistance */
    uint8_t res_heat;

    /*! Current DAC */
    uint8_t idac;

    /*! Gas wait period */
    uint8_t gas_wait;
#ifndef BME68X_USE_FPU

    /*! Temperature in degree celsius x100 */
    int16_t temperature;

    /*! Pressure in Pascal */
    uint32_t pressure;

    /*! Humidity in % relative humidity x1000 */
    uint32_t humidity;

    /*! Gas resistance in Ohms */
    uint32_t gas_resistance;
#else

    /*! Temperature in degree celsius */
    float temperature;

    /*! Pressure in Pascal */
    float pressure;

    /*! Humidity in % relative humidity x1000 */
    float humidity;

    /*! Gas resistance in Ohms */
    float gas_resistance;

#endif

};

/*
 * @brief Structure to hold the calibration coefficients
 */
struct bme68x_calib_data
{
    /*! Calibration coefficient for the humidity sensor */
    uint16_t par_h1;

    /*! Calibration coefficient for the humidity sensor */
    uint16_t par_h2;

    /*! Calibration coefficient for the humidity sensor */
    int8_t par_h3;

    /*! Calibration coefficient for the humidity sensor */
    int8_t par_h4;

    /*! Calibration coefficient for the humidity sensor */
    int8_t par_h5;

    /*! Calibration coefficient for the humidity sensor */
    uint8_t par_h6;

    /*! Calibration coefficient for the humidity sensor */
    int8_t par_h7;

    /*! Calibration coefficient for the gas sensor */
    int8_t par_gh1;

    /*! Calibration coefficient for the gas sensor */
    int16_t par_gh2;

    /*! Calibration coefficient for the gas sensor */
    int8_t par_gh3;

    /*! Calibration coefficient for the temperature sensor */
    uint16_t par_t1;

    /*! Calibration coefficient for the temperature sensor */
    int16_t par_t2;

    /*! Calibration coefficient for the temperature sensor */
    int8_t par_t3;

    /*! Calibration coefficient for the pressure sensor */
    uint16_t par_p1;

    /*! Calibration coefficient for the pressure sensor */
    int16_t par_p2;

    /*! Calibration coefficient for the pressure sensor */
    int8_t par_p3;

    /*! Calibration coefficient for the pressure sensor */
    int16_t par_p4;

    /*! Calibration coefficient for the pressure sensor */
    int16_t par_p5;

    /*! Calibration coefficient for the pressure sensor */
    int8_t par_p6;

    /*! Calibration coefficient for the pressure sensor */
    int8_t par_p7;

    /*! Calibration coefficient for the pressure sensor */
    int16_t par_p8;

    /*! Calibration coefficient for the pressure sensor */
    int16_t par_p9;

    /*! Calibration coefficient for the pressure sensor */
    uint8_t par_p10;
#ifndef BME68X_USE_FPU

    /*! Variable to store the intermediate temperature coefficient */
    int32_t t_fine;
#else

    /*! Variable to store the intermediate temperature coefficient */
    float t_fine;
#endif

    /*! Heater resistance range coefficient */
    uint8_t res_heat_range;

    /*! Heater resistance value coefficient */
    int8_t res_heat_val;

    /*! Gas resistance range switching error coefficient */
    int8_t range_sw_err;
};

/*
 * @brief BME68X sensor settings structure which comprises of ODR,
 * over-sampling and filter settings.
 */
struct bme68x_conf
{
    /*! Humidity oversampling. Refer @ref osx*/
    uint8_t os_hum;

    /*! Temperature oversampling. Refer @ref osx */
    uint8_t os_temp;

    /*! Pressure oversampling. Refer @ref osx */
    uint8_t os_pres;

    /*! Filter coefficient. Refer @ref filter*/
    uint8_t filter;

    /*!
     * Standby time between sequential mode measurement profiles.
     * Refer @ref odr
     */
    uint8_t odr;
};

/*
 * @brief BME68X gas heater configuration
 */
struct bme68x_heatr_conf
{
    /*! Enable gas measurement. Refer @ref en_dis */
    uint8_t enable;

    /*! Store the heater temperature for forced mode degree Celsius */
    uint16_t heatr_temp;

    /*! Store the heating duration for forced mode in milliseconds */
    uint16_t heatr_dur;

    /*! Store the heater temperature profile in degree Celsius */
    uint16_t *heatr_temp_prof;

    /*! Store the heating duration profile in milliseconds */
    uint16_t *heatr_dur_prof;

    /*! Variable to store the length of the heating profile */
    uint8_t profile_len;

    /*!
     * Variable to store heating duration for parallel mode
     * in milliseconds
     */
    uint16_t shared_heatr_dur;
};

/*
 * @brief BME68X device structure
 */
struct bme68x_dev
{
    /*! Chip Id */
    uint8_t chip_id;

    /*!
     * 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;

    /*!
     *             Variant id
     * ----------------------------------------
     *     Value   |           Variant
     * ----------------------------------------
     *      0      |   BME68X_VARIANT_GAS_LOW
     *      1      |   BME68X_VARIANT_GAS_HIGH
     * ----------------------------------------
     */
    uint32_t variant_id;

    /*! SPI/I2C interface */
    enum bme68x_intf intf;

    /*! Memory page used */
    uint8_t mem_page;

    /*! Ambient temperature in Degree C*/
    int8_t amb_temp;

    /*! Sensor calibration data */
    struct bme68x_calib_data calib;

    /*! Read function pointer */
    bme68x_read_fptr_t read;

    /*! Write function pointer */
    bme68x_write_fptr_t write;

    /*! Delay function pointer */
    bme68x_delay_us_fptr_t delay_us;

    /*! To store interface pointer error */
    BME68X_INTF_RET_TYPE intf_rslt;

    /*! Store the info messages */
    uint8_t info_msg;
};

#endif /* BME68X_DEFS_H_ */
/*! @endcond */