bme280_defs.h

/**
* 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 10/01/2020
* @version  3.4.1
*
*/

/*! @file bme280_defs.h
 * @brief Sensor driver for BME280 sensor
 */

/*!
 * @defgroup BME280 SENSOR API
 * @brief
 */
#ifndef BME280_DEFS_H_
#define BME280_DEFS_H_

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

/********************************************************/

#ifndef BME280_FLOAT_ENABLE

/* #define BME280_FLOAT_ENABLE */
#endif

#ifndef BME280_FLOAT_ENABLE
#ifndef BME280_64BIT_ENABLE
#define BME280_64BIT_ENABLE
#endif
#endif

#ifndef TRUE
#define TRUE                              UINT8_C(1)
#endif
#ifndef FALSE
#define FALSE                             UINT8_C(0)
#endif

/**\name I2C addresses */
#define BME280_I2C_ADDR_PRIM              UINT8_C(0x76)
#define BME280_I2C_ADDR_SEC               UINT8_C(0x77)

/**\name BME280 chip identifier */
#define BME280_CHIP_ID                    UINT8_C(0x60)

/**\name Register Address */
#define BME280_CHIP_ID_ADDR               UINT8_C(0xD0)
#define BME280_RESET_ADDR                 UINT8_C(0xE0)
#define BME280_TEMP_PRESS_CALIB_DATA_ADDR UINT8_C(0x88)
#define BME280_HUMIDITY_CALIB_DATA_ADDR   UINT8_C(0xE1)
#define BME280_PWR_CTRL_ADDR              UINT8_C(0xF4)
#define BME280_CTRL_HUM_ADDR              UINT8_C(0xF2)
#define BME280_CTRL_MEAS_ADDR             UINT8_C(0xF4)
#define BME280_CONFIG_ADDR                UINT8_C(0xF5)
#define BME280_DATA_ADDR                  UINT8_C(0xF7)

/**\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_DEV_NOT_FOUND            INT8_C(-2)
#define BME280_E_INVALID_LEN              INT8_C(-3)
#define BME280_E_COMM_FAIL                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 Macros related to size */
#define BME280_TEMP_PRESS_CALIB_DATA_LEN  UINT8_C(26)
#define BME280_HUMIDITY_CALIB_DATA_LEN    UINT8_C(7)
#define BME280_P_T_H_DATA_LEN             UINT8_C(8)

/**\name Sensor power modes */
#define BME280_SLEEP_MODE                 UINT8_C(0x00)
#define BME280_FORCED_MODE                UINT8_C(0x01)
#define BME280_NORMAL_MODE                UINT8_C(0x03)

/**\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)

#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))

/**\name Macros for bit masking */
#define BME280_SENSOR_MODE_MSK      UINT8_C(0x03)
#define BME280_SENSOR_MODE_POS      UINT8_C(0x00)

#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)

#define BME280_FILTER_MSK           UINT8_C(0x1C)
#define BME280_FILTER_POS           UINT8_C(0x02)

#define BME280_STANDBY_MSK          UINT8_C(0xE0)
#define BME280_STANDBY_POS          UINT8_C(0x05)

/**\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_OSR_PRESS_SEL        UINT8_C(1)
#define BME280_OSR_TEMP_SEL         UINT8_C(1 << 1)
#define BME280_OSR_HUM_SEL          UINT8_C(1 << 2)
#define BME280_FILTER_SEL           UINT8_C(1 << 3)
#define BME280_STANDBY_SEL          UINT8_C(1 << 4)
#define BME280_ALL_SETTINGS_SEL     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)

/**\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)

/**\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)

/**\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_STATUS_REG_ADDR      (0xF3)
#define BME280_SOFT_RESET_COMMAND   (0xB6)
#define BME280_STATUS_IM_UPDATE     (0x01)

/*!
 * @brief Interface selection Enums
 */
enum bme280_intf {
    /*! SPI interface */
    BME280_SPI_INTF,

    /*! I2C interface */
    BME280_I2C_INTF
};

/*!
 * @brief Type definitions
 */
typedef int8_t (*bme280_com_fptr_t)(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len);
typedef void (*bme280_delay_fptr_t)(uint32_t period);

/*!
 * @brief Calibration data
 */
struct bme280_calib_data
{
    /**
     * @ Trim Variables
     */

    /**@{*/
    uint16_t dig_t1;
    int16_t dig_t2;
    int16_t dig_t3;
    uint16_t dig_p1;
    int16_t dig_p2;
    int16_t dig_p3;
    int16_t dig_p4;
    int16_t dig_p5;
    int16_t dig_p6;
    int16_t dig_p7;
    int16_t dig_p8;
    int16_t dig_p9;
    uint8_t dig_h1;
    int16_t dig_h2;
    uint8_t dig_h3;
    int16_t dig_h4;
    int16_t dig_h5;
    int8_t dig_h6;
    int32_t t_fine;

    /**@}*/
};

/*!
 * @brief bme280 sensor structure which comprises of temperature, pressure and
 * humidity data
 */
#ifdef BME280_FLOAT_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;

    /*! Device Id */
    uint8_t dev_id;

    /*! SPI/I2C interface */
    enum bme280_intf intf;

    /*! Read function pointer */
    bme280_com_fptr_t read;

    /*! Write function pointer */
    bme280_com_fptr_t write;

    /*! Delay function pointer */
    bme280_delay_fptr_t delay_ms;

    /*! Trim data */
    struct bme280_calib_data calib_data;

    /*! Sensor settings */
    struct bme280_settings settings;
};

#endif /* BME280_DEFS_H_ */
/** @}*/
/** @}*/