Data Structures
struct	bme280_calibration_param_t
	This structure holds all device specific calibration parameters. More...

struct	bme280_t
	This structure holds BME280 initialization parameters. More...

Functions
FUNCTION FOR INTIALIZATION
BME280_RETURN_FUNCTION_TYPE	bme280_init (struct bme280_t *bme280)
	This function is used for initialize the bus read and bus write functions and assign the chip id and I2C address of the BME280 sensor chip id is read in the register 0xD0 bit from 0 to 7. More...

FUNCTION FOR INTIALIZATION UNCOMPENSATED TEMPERATURE
BME280_RETURN_FUNCTION_TYPE	bme280_read_uncomp_temperature (s32 *v_uncomp_temperature_s32)
	This API is used to read uncompensated temperature in the registers 0xFA, 0xFB and 0xFC. More...

FUNCTION FOR INTIALIZATION TRUE TEMPERATURE
s32	bme280_compensate_temperature_int32 (s32 v_uncomp_temperature_s32)
	Reads actual temperature from uncompensated temperature. More...

s16	bme280_compensate_temperature_int32_sixteen_bit_output (s32 v_uncomp_temperature_s32)
	Reads actual temperature from uncompensated temperature. More...

FUNCTION FOR INTIALIZATION UNCOMPENSATED PRESSURE
BME280_RETURN_FUNCTION_TYPE	bme280_read_uncomp_pressure (s32 *v_uncomp_pressure_s32)
	This API is used to read uncompensated pressure. in the registers 0xF7, 0xF8 and 0xF9. More...

FUNCTION FOR INTIALIZATION TRUE PRESSURE
u32	bme280_compensate_pressure_int32 (s32 v_uncomp_pressure_s32)
	Reads actual pressure from uncompensated pressure. More...

FUNCTION FOR INTIALIZATION UNCOMPENSATED HUMIDITY
BME280_RETURN_FUNCTION_TYPE	bme280_read_uncomp_humidity (s32 *v_uncomp_humidity_s32)
	This API is used to read uncompensated humidity. in the registers 0xF7, 0xF8 and 0xF9. More...

FUNCTION FOR INTIALIZATION RELATIVE HUMIDITY
u32	bme280_compensate_humidity_int32 (s32 v_uncomp_humidity_s32)
	Reads actual humidity from uncompensated humidity. More...

u16	bme280_compensate_humidity_int32_sixteen_bit_output (s32 v_uncomp_humidity_s32)
	Reads actual humidity from uncompensated humidity. More...

FUNCTION FOR INTIALIZATION UNCOMPENSATED PRESSURE,
TEMPERATURE AND HUMIDITY
BME280_RETURN_FUNCTION_TYPE	bme280_read_uncomp_pressure_temperature_humidity (s32 v_uncomp_pressure_s32, s32 v_uncomp_temperature_s32, s32 *v_uncomp_humidity_s32)
	This API used to read uncompensated pressure,temperature and humidity. More...

FUNCTION FOR TRUE UNCOMPENSATED PRESSURE,
TEMPERATURE AND HUMIDITY
BME280_RETURN_FUNCTION_TYPE	bme280_read_pressure_temperature_humidity (u32 v_pressure_u32, s32 v_temperature_s32, u32 *v_humidity_u32)
	This API used to read true pressure, temperature and humidity. More...

FUNCTION FOR CALIBRATION
BME280_RETURN_FUNCTION_TYPE	bme280_get_calib_param (void)
	This API is used to calibration parameters used for calculation in the registers. More...

FUNCTION FOR TEMPERATURE OVER SAMPLING
BME280_RETURN_FUNCTION_TYPE	bme280_get_oversamp_temperature (u8 *v_value_u8)
	This API is used to get the temperature oversampling setting in the register 0xF4 bits from 5 to 7. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_oversamp_temperature (u8 v_value_u8)
	This API is used to set the temperature oversampling setting in the register 0xF4 bits from 5 to 7. More...

FUNCTION FOR PRESSURE OVER SAMPLING
BME280_RETURN_FUNCTION_TYPE	bme280_get_oversamp_pressure (u8 *v_value_u8)
	This API is used to get the pressure oversampling setting in the register 0xF4 bits from 2 to 4. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_oversamp_pressure (u8 v_value_u8)
	This API is used to set the pressure oversampling setting in the register 0xF4 bits from 2 to 4. More...

FUNCTION FOR HUMIDITY OVER SAMPLING
BME280_RETURN_FUNCTION_TYPE	bme280_get_oversamp_humidity (u8 *v_value_u8)
	This API is used to get the humidity oversampling setting in the register 0xF2 bits from 0 to 2. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_oversamp_humidity (u8 v_value_u8)
	This API is used to set the humidity oversampling setting in the register 0xF2 bits from 0 to 2. More...

FUNCTION FOR POWER MODE
BME280_RETURN_FUNCTION_TYPE	bme280_get_power_mode (u8 *v_power_mode_u8)
	This API used to get the Operational Mode from the sensor in the register 0xF4 bit 0 and 1. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_power_mode (u8 v_power_mode_u8)
	This API used to set the Operational Mode from the sensor in the register 0xF4 bit 0 and 1. More...

FUNCTION FOR SOFT RESET
BME280_RETURN_FUNCTION_TYPE	bme280_set_soft_rst (void)
	Used to reset the sensor The value 0xB6 is written to the 0xE0 register the device is reset using the complete power-on-reset procedure. More...

FUNCTION FOR SPI ENABLE
BME280_RETURN_FUNCTION_TYPE	bme280_get_spi3 (u8 *v_enable_disable_u8)
	This API used to get the sensor SPI mode(communication type) in the register 0xF5 bit 0. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_spi3 (u8 v_enable_disable_u8)
	This API used to set the sensor SPI mode(communication type) in the register 0xF5 bit 0. More...

FUNCTION FOR IIR FILTER
BME280_RETURN_FUNCTION_TYPE	bme280_get_filter (u8 *v_value_u8)
	This API is used to reads filter setting in the register 0xF5 bit 3 and 4. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_filter (u8 v_value_u8)
	This API is used to write filter setting in the register 0xF5 bit 3 and 4. More...

FUNCTION FOR STANDBY DURATION
BME280_RETURN_FUNCTION_TYPE	bme280_get_standby_durn (u8 *v_standby_durn_u8)
	This API used to Read the standby duration time from the sensor in the register 0xF5 bit 5 to 7. More...

BME280_RETURN_FUNCTION_TYPE	bme280_set_standby_durn (u8 v_standby_durn_u8)
	This API used to write the standby duration time from the sensor in the register 0xF5 bit 5 to 7. More...

FUNCTION FOR FORCE MODE DATA READ
BME280_RETURN_FUNCTION_TYPE	bme280_get_forced_uncomp_pressure_temperature_humidity (s32 v_uncom_pressure_s32, s32 v_uncom_temperature_s32, s32 *v_uncom_humidity_s32)
	This API used to read uncompensated temperature,pressure and humidity in forced mode. More...

FUNCTION FOR COMMON READ AND WRITE
BME280_RETURN_FUNCTION_TYPE	bme280_write_register (u8 v_addr_u8, u8 *v_data_u8, u8 v_len_u8)
	This API write the data to the given register. More...

BME280_RETURN_FUNCTION_TYPE	bme280_read_register (u8 v_addr_u8, u8 *v_data_u8, u8 v_len_u8)
	This API reads the data from the given register. More...

FUNCTION FOR FLOAT OUTPUT TEMPERATURE
double	bme280_compensate_temperature_double (s32 v_uncom_temperature_s32)
	Reads actual temperature from uncompensated temperature. More...

FUNCTION FOR FLOAT OUTPUT PRESSURE
double	bme280_compensate_pressure_double (s32 v_uncom_pressure_s32)
	Reads actual pressure from uncompensated pressure. More...

FUNCTION FOR FLOAT OUTPUT HUMIDITY
double	bme280_compensate_humidity_double (s32 v_uncom_humidity_s32)
	Reads actual humidity from uncompensated humidity. More...

FUNCTION FOR 64BIT OUTPUT PRESSURE
u32	bme280_compensate_pressure_int64 (s32 v_uncom_pressure_s32)
	Reads actual pressure from uncompensated pressure. More...

FUNCTION FOR 24BIT OUTPUT PRESSURE
u32	bme280_compensate_pressure_int64_twentyfour_bit_output (s32 v_uncom_pressure_s32)
	Reads actual pressure from uncompensated pressure. More...

FUNCTION FOR WAIT PERIOD
BME280_RETURN_FUNCTION_TYPE	bme280_compute_wait_time (u8 *v_delaytime_u8r)
	Computing waiting time for sensor data read. More...

Macros
#define	MACHINE_32_BIT
	The following definition uses for define the data types. More...

#define	BME280_64BITSUPPORT_PRESENT
	If your machine support 64 bit define the MACHINE_64_BIT.

ENABLE FLATING OUTPUT
#define	BME280_ENABLE_FLOAT
	If the user wants to support floating point calculations, please set the following define. If floating point calculation is not wanted or allowed (e.g. in Linux kernel), please do not set the define.

#define	BME280_ENABLE_INT64
	If the user wants to support 64 bit integer calculation (needed for optimal pressure accuracy) please set the following define. If int64 calculation is not wanted (e.g. because it would include large libraries), please do not set the define.

BUS READ AND WRITE FUNCTION POINTERS
#define	BME280_BUS_WR_RETURN_TYPE s8
	Define the calling convention of YOUR bus communication routine. More...

#define	BME280_BUS_WR_PARAM_TYPES

#define	BME280_BUS_WR_PARAM_ORDER(device_addr, register_addr, register_data, wr_len)

#define	BME280_BUS_WRITE_FUNC(device_addr, register_addr, register_data, wr_len)

#define	BME280_BUS_RD_RETURN_TYPE s8
	link macro between API function calls and bus read function More...

#define	BME280_BUS_RD_PARAM_TYPES
	defines the calling parameter types of the BME280_RD_FUNCTION More...

#define	BME280_BUS_RD_PARAM_ORDER

#define	BME280_BUS_READ_FUNC(device_addr, register_addr, register_data, rd_len)

#define	BME280_WR_FUNC_PTR

#define	BME280_RD_FUNC_PTR

#define	BME280_MDELAY_DATA_TYPE u16

#define	BME280_3MS_DELAY 3

DELAY
#define	BME280_DELAY_RETURN_TYPE void

#define	BME280_DELAY_PARAM_TYPES u16

GET AND SET BITSLICE FUNCTIONS
#define	BME280_DELAY_FUNC(delay_in_msec) delay_func(delay_in_msec)

#define	BME280_GET_BITSLICE(regvar, bitname) ((regvar & bitname##__MSK) >> bitname##__POS)

#define	BME280_SET_BITSLICE(regvar, bitname, val) ((regvar & ~bitname##__MSK) \| ((val<<bitname##__POS)&bitname##__MSK))

COMMON USED CONSTANTS
#define	BME280_NULL (0)

#define	BME280_RETURN_FUNCTION_TYPE s8

#define	BME280_SHIFT_BIT_POSITION_BY_01_BIT (1)

#define	BME280_SHIFT_BIT_POSITION_BY_02_BITS (2)

#define	BME280_SHIFT_BIT_POSITION_BY_03_BITS (3)

#define	BME280_SHIFT_BIT_POSITION_BY_04_BITS (4)

#define	BME280_SHIFT_BIT_POSITION_BY_07_BITS (7)

#define	BME280_SHIFT_BIT_POSITION_BY_08_BITS (8)

#define	BME280_SHIFT_BIT_POSITION_BY_10_BITS (10)

#define	BME280_SHIFT_BIT_POSITION_BY_11_BITS (11)

#define	BME280_SHIFT_BIT_POSITION_BY_12_BITS (12)

#define	BME280_SHIFT_BIT_POSITION_BY_13_BITS (13)

#define	BME280_SHIFT_BIT_POSITION_BY_14_BITS (14)

#define	BME280_SHIFT_BIT_POSITION_BY_15_BITS (15)

#define	BME280_SHIFT_BIT_POSITION_BY_16_BITS (16)

#define	BME280_SHIFT_BIT_POSITION_BY_17_BITS (17)

#define	BME280_SHIFT_BIT_POSITION_BY_18_BITS (18)

#define	BME280_SHIFT_BIT_POSITION_BY_19_BITS (19)

#define	BME280_SHIFT_BIT_POSITION_BY_20_BITS (20)

#define	BME280_SHIFT_BIT_POSITION_BY_25_BITS (25)

#define	BME280_SHIFT_BIT_POSITION_BY_31_BITS (31)

#define	BME280_SHIFT_BIT_POSITION_BY_33_BITS (33)

#define	BME280_SHIFT_BIT_POSITION_BY_35_BITS (35)

#define	BME280_SHIFT_BIT_POSITION_BY_47_BITS (47)

#define	BME280_PRESSURE_TEMPERATURE_CALIB_DATA_LENGTH (26)

#define	BME280_HUMIDITY_CALIB_DATA_LENGTH (7)

#define	BME280_GEN_READ_WRITE_DATA_LENGTH (1)

#define	BME280_HUMIDITY_DATA_LENGTH (2)

#define	BME280_TEMPERATURE_DATA_LENGTH (3)

#define	BME280_PRESSURE_DATA_LENGTH (3)

#define	BME280_ALL_DATA_FRAME_LENGTH (8)

#define	BME280_INIT_VALUE (0)

#define	BME280_INVALID_DATA (0)

ERROR CODE DEFINITIONS
#define	SUCCESS ((u8)0)

#define	E_BME280_NULL_PTR ((s8)-127)

#define	E_BME280_COMM_RES ((s8)-1)

#define	E_BME280_OUT_OF_RANGE ((s8)-2)

#define	ERROR ((s8)-1)

I2C ADDRESS DEFINITIONS
#define	BME280_I2C_ADDRESS1 (0x76)

#define	BME280_I2C_ADDRESS2 (0x77)

POWER MODE DEFINITIONS
#define	BME280_SLEEP_MODE (0x00)

#define	BME280_FORCED_MODE (0x01)

#define	BME280_NORMAL_MODE (0x03)

#define	BME280_SOFT_RESET_CODE (0xB6)

STANDBY DEFINITIONS
#define	BME280_STANDBY_TIME_1_MS (0x00)

#define	BME280_STANDBY_TIME_63_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)

OVER SAMPLING DEFINITIONS
#define	BME280_OVERSAMP_SKIPPED (0x00)

#define	BME280_OVERSAMP_1X (0x01)

#define	BME280_OVERSAMP_2X (0x02)

#define	BME280_OVERSAMP_4X (0x03)

#define	BME280_OVERSAMP_8X (0x04)

#define	BME280_OVERSAMP_16X (0x05)

WORK MODE DEFINITIONS
#define	BME280_STANDARD_OVERSAMP_HUMIDITY BME280_OVERSAMP_1X

FILTER DEFINITIONS
#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)

DELAY DEFINITIONS
#define	T_INIT_MAX (20)

#define	T_MEASURE_PER_OSRS_MAX (37)

#define	T_SETUP_PRESSURE_MAX (10)

#define	T_SETUP_HUMIDITY_MAX (10)

DEFINITIONS FOR ARRAY SIZE OF DATA
#define	BME280_HUMIDITY_DATA_SIZE (2)

#define	BME280_TEMPERATURE_DATA_SIZE (3)

#define	BME280_PRESSURE_DATA_SIZE (3)

#define	BME280_DATA_FRAME_SIZE (8)

#define	BME280_CALIB_DATA_SIZE (26)

#define	BME280_TEMPERATURE_MSB_DATA (0)

#define	BME280_TEMPERATURE_LSB_DATA (1)

#define	BME280_TEMPERATURE_XLSB_DATA (2)

#define	BME280_PRESSURE_MSB_DATA (0)

#define	BME280_PRESSURE_LSB_DATA (1)

#define	BME280_PRESSURE_XLSB_DATA (2)

#define	BME280_HUMIDITY_MSB_DATA (0)

#define	BME280_HUMIDITY_LSB_DATA (1)

#define	BME280_DATA_FRAME_PRESSURE_MSB_BYTE (0)

#define	BME280_DATA_FRAME_PRESSURE_LSB_BYTE (1)

#define	BME280_DATA_FRAME_PRESSURE_XLSB_BYTE (2)

#define	BME280_DATA_FRAME_TEMPERATURE_MSB_BYTE (3)

#define	BME280_DATA_FRAME_TEMPERATURE_LSB_BYTE (4)

#define	BME280_DATA_FRAME_TEMPERATURE_XLSB_BYTE (5)

#define	BME280_DATA_FRAME_HUMIDITY_MSB_BYTE (6)

#define	BME280_DATA_FRAME_HUMIDITY_LSB_BYTE (7)

ARRAY PARAMETER FOR CALIBRATION
#define	BME280_TEMPERATURE_CALIB_DIG_T1_LSB (0)

#define	BME280_TEMPERATURE_CALIB_DIG_T1_MSB (1)

#define	BME280_TEMPERATURE_CALIB_DIG_T2_LSB (2)

#define	BME280_TEMPERATURE_CALIB_DIG_T2_MSB (3)

#define	BME280_TEMPERATURE_CALIB_DIG_T3_LSB (4)

#define	BME280_TEMPERATURE_CALIB_DIG_T3_MSB (5)

#define	BME280_PRESSURE_CALIB_DIG_P1_LSB (6)

#define	BME280_PRESSURE_CALIB_DIG_P1_MSB (7)

#define	BME280_PRESSURE_CALIB_DIG_P2_LSB (8)

#define	BME280_PRESSURE_CALIB_DIG_P2_MSB (9)

#define	BME280_PRESSURE_CALIB_DIG_P3_LSB (10)

#define	BME280_PRESSURE_CALIB_DIG_P3_MSB (11)

#define	BME280_PRESSURE_CALIB_DIG_P4_LSB (12)

#define	BME280_PRESSURE_CALIB_DIG_P4_MSB (13)

#define	BME280_PRESSURE_CALIB_DIG_P5_LSB (14)

#define	BME280_PRESSURE_CALIB_DIG_P5_MSB (15)

#define	BME280_PRESSURE_CALIB_DIG_P6_LSB (16)

#define	BME280_PRESSURE_CALIB_DIG_P6_MSB (17)

#define	BME280_PRESSURE_CALIB_DIG_P7_LSB (18)

#define	BME280_PRESSURE_CALIB_DIG_P7_MSB (19)

#define	BME280_PRESSURE_CALIB_DIG_P8_LSB (20)

#define	BME280_PRESSURE_CALIB_DIG_P8_MSB (21)

#define	BME280_PRESSURE_CALIB_DIG_P9_LSB (22)

#define	BME280_PRESSURE_CALIB_DIG_P9_MSB (23)

#define	BME280_HUMIDITY_CALIB_DIG_H1 (25)

#define	BME280_HUMIDITY_CALIB_DIG_H2_LSB (0)

#define	BME280_HUMIDITY_CALIB_DIG_H2_MSB (1)

#define	BME280_HUMIDITY_CALIB_DIG_H3 (2)

#define	BME280_HUMIDITY_CALIB_DIG_H4_MSB (3)

#define	BME280_HUMIDITY_CALIB_DIG_H4_LSB (4)

#define	BME280_HUMIDITY_CALIB_DIG_H5_MSB (5)

#define	BME280_HUMIDITY_CALIB_DIG_H6 (6)

#define	BME280_MASK_DIG_H4 (0x0F)

CALIBRATION REGISTER ADDRESS DEFINITIONS
#define	BME280_TEMPERATURE_CALIB_DIG_T1_LSB_REG (0x88)

#define	BME280_TEMPERATURE_CALIB_DIG_T1_MSB_REG (0x89)

#define	BME280_TEMPERATURE_CALIB_DIG_T2_LSB_REG (0x8A)

#define	BME280_TEMPERATURE_CALIB_DIG_T2_MSB_REG (0x8B)

#define	BME280_TEMPERATURE_CALIB_DIG_T3_LSB_REG (0x8C)

#define	BME280_TEMPERATURE_CALIB_DIG_T3_MSB_REG (0x8D)

#define	BME280_PRESSURE_CALIB_DIG_P1_LSB_REG (0x8E)

#define	BME280_PRESSURE_CALIB_DIG_P1_MSB_REG (0x8F)

#define	BME280_PRESSURE_CALIB_DIG_P2_LSB_REG (0x90)

#define	BME280_PRESSURE_CALIB_DIG_P2_MSB_REG (0x91)

#define	BME280_PRESSURE_CALIB_DIG_P3_LSB_REG (0x92)

#define	BME280_PRESSURE_CALIB_DIG_P3_MSB_REG (0x93)

#define	BME280_PRESSURE_CALIB_DIG_P4_LSB_REG (0x94)

#define	BME280_PRESSURE_CALIB_DIG_P4_MSB_REG (0x95)

#define	BME280_PRESSURE_CALIB_DIG_P5_LSB_REG (0x96)

#define	BME280_PRESSURE_CALIB_DIG_P5_MSB_REG (0x97)

#define	BME280_PRESSURE_CALIB_DIG_P6_LSB_REG (0x98)

#define	BME280_PRESSURE_CALIB_DIG_P6_MSB_REG (0x99)

#define	BME280_PRESSURE_CALIB_DIG_P7_LSB_REG (0x9A)

#define	BME280_PRESSURE_CALIB_DIG_P7_MSB_REG (0x9B)

#define	BME280_PRESSURE_CALIB_DIG_P8_LSB_REG (0x9C)

#define	BME280_PRESSURE_CALIB_DIG_P8_MSB_REG (0x9D)

#define	BME280_PRESSURE_CALIB_DIG_P9_LSB_REG (0x9E)

#define	BME280_PRESSURE_CALIB_DIG_P9_MSB_REG (0x9F)

#define	BME280_HUMIDITY_CALIB_DIG_H1_REG (0xA1)

#define	BME280_HUMIDITY_CALIB_DIG_H2_LSB_REG (0xE1)

#define	BME280_HUMIDITY_CALIB_DIG_H2_MSB_REG (0xE2)

#define	BME280_HUMIDITY_CALIB_DIG_H3_REG (0xE3)

#define	BME280_HUMIDITY_CALIB_DIG_H4_MSB_REG (0xE4)

#define	BME280_HUMIDITY_CALIB_DIG_H4_LSB_REG (0xE5)

#define	BME280_HUMIDITY_CALIB_DIG_H5_MSB_REG (0xE6)

#define	BME280_HUMIDITY_CALIB_DIG_H6_REG (0xE7)

REGISTER ADDRESS DEFINITIONS
#define	BME280_CHIP_ID_REG (0xD0) /Chip ID Register /

#define	BME280_RST_REG (0xE0) /Softreset Register /

#define	BME280_STAT_REG (0xF3) /Status Register /

#define	BME280_CTRL_MEAS_REG (0xF4) /Ctrl Measure Register /

#define	BME280_CTRL_HUMIDITY_REG (0xF2) /Ctrl Humidity Register/

#define	BME280_CONFIG_REG (0xF5) /Configuration Register /

#define	BME280_PRESSURE_MSB_REG (0xF7) /Pressure MSB Register /

#define	BME280_PRESSURE_LSB_REG (0xF8) /Pressure LSB Register /

#define	BME280_PRESSURE_XLSB_REG (0xF9) /Pressure XLSB Register /

#define	BME280_TEMPERATURE_MSB_REG (0xFA) /Temperature MSB Reg /

#define	BME280_TEMPERATURE_LSB_REG (0xFB) /Temperature LSB Reg /

#define	BME280_TEMPERATURE_XLSB_REG (0xFC) /Temperature XLSB Reg /

#define	BME280_HUMIDITY_MSB_REG (0xFD) /Humidity MSB Reg /

#define	BME280_HUMIDITY_LSB_REG (0xFE) /Humidity LSB Reg /

BIT MASK, LENGTH AND POSITION DEFINITIONS
FOR PRESSURE AND TEMPERATURE DATA
#define	BME280_STAT_REG_MEASURING__POS (3)

#define	BME280_STAT_REG_MEASURING__MSK (0x08)

#define	BME280_STAT_REG_MEASURING__LEN (1)

#define	BME280_STAT_REG_MEASURING__REG (BME280_STAT_REG)

#define	BME280_STAT_REG_IM_UPDATE__POS (0)

#define	BME280_STAT_REG_IM_UPDATE__MSK (0x01)

#define	BME280_STAT_REG_IM_UPDATE__LEN (1)

#define	BME280_STAT_REG_IM_UPDATE__REG (BME280_STAT_REG)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_TEMPERATURE__POS (5)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_TEMPERATURE__MSK (0xE0)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_TEMPERATURE__LEN (3)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_TEMPERATURE__REG (BME280_CTRL_MEAS_REG)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_PRESSURE__POS (2)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_PRESSURE__MSK (0x1C)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_PRESSURE__LEN (3)

#define	BME280_CTRL_MEAS_REG_OVERSAMP_PRESSURE__REG (BME280_CTRL_MEAS_REG)

#define	BME280_CTRL_MEAS_REG_POWER_MODE__POS (0)

#define	BME280_CTRL_MEAS_REG_POWER_MODE__MSK (0x03)

#define	BME280_CTRL_MEAS_REG_POWER_MODE__LEN (2)

#define	BME280_CTRL_MEAS_REG_POWER_MODE__REG (BME280_CTRL_MEAS_REG)

#define	BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY__POS (0)

#define	BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY__MSK (0x07)

#define	BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY__LEN (3)

#define	BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY__REG (BME280_CTRL_HUMIDITY_REG)

#define	BME280_CONFIG_REG_TSB__POS (5)

#define	BME280_CONFIG_REG_TSB__MSK (0xE0)

#define	BME280_CONFIG_REG_TSB__LEN (3)

#define	BME280_CONFIG_REG_TSB__REG (BME280_CONFIG_REG)

#define	BME280_CONFIG_REG_FILTER__POS (2)

#define	BME280_CONFIG_REG_FILTER__MSK (0x1C)

#define	BME280_CONFIG_REG_FILTER__LEN (3)

#define	BME280_CONFIG_REG_FILTER__REG (BME280_CONFIG_REG)

#define	BME280_CONFIG_REG_SPI3_ENABLE__POS (0)

#define	BME280_CONFIG_REG_SPI3_ENABLE__MSK (0x01)

#define	BME280_CONFIG_REG_SPI3_ENABLE__LEN (1)

#define	BME280_CONFIG_REG_SPI3_ENABLE__REG (BME280_CONFIG_REG)

#define	BME280_PRESSURE_XLSB_REG_DATA__POS (4)

#define	BME280_PRESSURE_XLSB_REG_DATA__MSK (0xF0)

#define	BME280_PRESSURE_XLSB_REG_DATA__LEN (4)

#define	BME280_PRESSURE_XLSB_REG_DATA__REG (BME280_PRESSURE_XLSB_REG)

#define	BME280_TEMPERATURE_XLSB_REG_DATA__POS (4)

#define	BME280_TEMPERATURE_XLSB_REG_DATA__MSK (0xF0)

#define	BME280_TEMPERATURE_XLSB_REG_DATA__LEN (4)

#define	BME280_TEMPERATURE_XLSB_REG_DATA__REG (BME280_TEMPERATURE_XLSB_REG)

Typedefs
typedef signed char	s8
	If your machine support 16 bit define the MACHINE_16_BIT. More...

typedef signed short int	s16

typedef signed int	s32

typedef signed long long int	s64

typedef unsigned char	u8

typedef unsigned short int	u16

typedef unsigned int	u32

typedef unsigned long long int	u64

Function Documentation

BME280_RETURN_FUNCTION_TYPE bme280_init ( struct bme280_t * bme280 )

Parameters

bme280 structure pointer.

Note: While changing the parameter of the bme280_t; consider the following point: Changing the reference value of the parameter will changes the local copy or local reference make sure your changes will not affect the reference value of the parameter (Better case don't change the reference value of the parameter)

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_uncomp_temperature ( s32 * v_uncomp_temperature_s32 )

Note: 0xFA -> MSB -> bit from 0 to 7; 0xFB -> LSB -> bit from 0 to 7; 0xFC -> LSB -> bit from 4 to 7

Parameters

v_uncomp_temperature_s32 : The value of uncompensated temperature

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

s32 bme280_compensate_temperature_int32 ( s32 v_uncomp_temperature_s32 )

Note: Returns the value in 0.01 degree Centigrade Output value of "5123" equals 51.23 DegC.

Parameters

v_uncomp_temperature_s32 : value of uncompensated temperature

Returns: Returns the actual temperature

Here is the caller graph for this function:

s16 bme280_compensate_temperature_int32_sixteen_bit_output ( s32 v_uncomp_temperature_s32 )

Note: Returns the value with 500LSB/DegC centred around 24 DegC output value of "5123" equals(5123/500)+24 = 34.246DegC

Parameters

v_uncomp_temperature_s32 value of uncompensated temperature

Returns: Return the actual temperature as s16 output

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_uncomp_pressure ( s32 * v_uncomp_pressure_s32 )

Note: 0xF7 -> MSB -> bit from 0 to 7; 0xF8 -> LSB -> bit from 0 to 7; 0xF9 -> LSB -> bit from 4 to 7

Parameters

v_uncomp_pressure_s32 : The value of uncompensated pressure

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

u32 bme280_compensate_pressure_int32 ( s32 v_uncomp_pressure_s32 )

Note: Returns the value in Pascal(Pa) Output value of "96386" equals 96386 Pa = 963.86 hPa = 963.86 millibar

Parameters

v_uncomp_pressure_s32 : value of uncompensated pressure

Returns: Return the actual pressure output as u32

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_uncomp_humidity ( s32 * v_uncomp_humidity_s32 )

Note: 0xFD -> MSB -> bit from 0 to 7; 0xFE -> LSB -> bit from 0 to 7

Parameters

v_uncomp_humidity_s32 : The value of uncompensated humidity

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

u32 bme280_compensate_humidity_int32 ( s32 v_uncomp_humidity_s32 )

Note: Returns the value in rH as unsigned 32bit integer in Q22.10 format(22 integer 10 fractional bits).; An output value of 42313 represents 42313 / 1024 = 41.321 rH

Parameters

v_uncomp_humidity_s32 value of uncompensated humidity

Returns: Return the actual relative humidity output as u32

Here is the caller graph for this function:

u16 bme280_compensate_humidity_int32_sixteen_bit_output ( s32 v_uncomp_humidity_s32 )

Note: Returns the value in rH as unsigned 16bit integer; An output value of 42313 represents 42313/512 = 82.643 rH

Parameters

v_uncomp_humidity_s32 value of uncompensated humidity

Returns: Return the actual relative humidity output as u16

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_uncomp_pressure_temperature_humidity	(	s32 *	v_uncomp_pressure_s32,
		s32 *	v_uncomp_temperature_s32,
		s32 *	v_uncomp_humidity_s32
	)

Parameters

v_uncomp_pressure_s32	The value of uncompensated pressure.
v_uncomp_temperature_s32	The value of uncompensated temperature
v_uncomp_humidity_s32	The value of uncompensated humidity.

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_pressure_temperature_humidity	(	u32 *	v_pressure_u32,
		s32 *	v_temperature_s32,
		u32 *	v_humidity_u32
	)

Parameters

v_pressure_u32	: The value of compensated pressure.
v_temperature_s32	: The value of compensated temperature.
v_humidity_u32	: The value of compensated humidity.

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_calib_param ( void )

parameter	Register address	bit
dig_T1	0x88 and 0x89	from 0 : 7 to 8: 15
dig_T2	0x8A and 0x8B	from 0 : 7 to 8: 15
dig_T3	0x8C and 0x8D	from 0 : 7 to 8: 15
dig_P1	0x8E and 0x8F	from 0 : 7 to 8: 15
dig_P2	0x90 and 0x91	from 0 : 7 to 8: 15
dig_P3	0x92 and 0x93	from 0 : 7 to 8: 15
dig_P4	0x94 and 0x95	from 0 : 7 to 8: 15
dig_P5	0x96 and 0x97	from 0 : 7 to 8: 15
dig_P6	0x98 and 0x99	from 0 : 7 to 8: 15
dig_P7	0x9A and 0x9B	from 0 : 7 to 8: 15
dig_P8	0x9C and 0x9D	from 0 : 7 to 8: 15
dig_P9	0x9E and 0x9F	from 0 : 7 to 8: 15
dig_H1	0xA1	from 0 to 7
dig_H2	0xE1 and 0xE2	from 0 : 7 to 8: 15
dig_H3	0xE3	from 0 to 7

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_oversamp_temperature ( u8 * v_value_u8 )

value	Temperature oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of temperature over sampling

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_oversamp_temperature ( u8 v_value_u8 )

value	Temperature oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of temperature over sampling

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_oversamp_pressure ( u8 * v_value_u8 )

value	Pressure oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of pressure oversampling

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_oversamp_pressure ( u8 v_value_u8 )

value	Pressure oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of pressure oversampling

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_oversamp_humidity ( u8 * v_value_u8 )

value	Humidity oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of humidity over sampling

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_oversamp_humidity ( u8 v_value_u8 )

value	Humidity oversampling
0x00	Skipped
0x01	BME280_OVERSAMP_1X
0x02	BME280_OVERSAMP_2X
0x03	BME280_OVERSAMP_4X
0x04	BME280_OVERSAMP_8X
0x05,0x06 and 0x07	BME280_OVERSAMP_16X

Parameters

v_value_u8 : The value of humidity over sampling

Note: The "BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY" register sets the humidity data acquisition options of the device.; changes to this registers only become effective after a write operation to "BME280_CTRL_MEAS_REG" register.; In the code automated reading and writing of "BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY"; register first set the "BME280_CTRL_HUMIDITY_REG_OVERSAMP_HUMIDITY" and then read and write the "BME280_CTRL_MEAS_REG" register in the function.

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_power_mode ( u8 * v_power_mode_u8 )

Parameters

v_power_mode_u8

: The value of power mode

value	mode
0x00	BME280_SLEEP_MODE
0x01 and 0x02	BME280_FORCED_MODE
0x03	BME280_NORMAL_MODE

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_set_power_mode ( u8 v_power_mode_u8 )

Parameters

v_power_mode_u8

: The value of power mode

value	mode
0x00	BME280_SLEEP_MODE
0x01 and 0x02	BME280_FORCED_MODE
0x03	BME280_NORMAL_MODE

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_set_soft_rst ( void )

Note: Soft reset can be easily set using bme280_set_softreset().; Usage Hint : bme280_set_softreset()

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_spi3 ( u8 * v_enable_disable_u8 )

Parameters

v_enable_disable_u8

: The value of SPI enable

value	Description
0	Disable
1	Enable

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_spi3 ( u8 v_enable_disable_u8 )

Parameters

v_enable_disable_u8

: The value of SPI enable

value	Description
0	Disable
1	Enable

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_filter ( u8 * v_value_u8 )

Parameters

v_value_u8 : The value of IIR filter coefficient

value	Filter coefficient
0x00	BME280_FILTER_COEFF_OFF
0x01	BME280_FILTER_COEFF_2
0x02	BME280_FILTER_COEFF_4
0x03	BME280_FILTER_COEFF_8
0x04	BME280_FILTER_COEFF_16

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_filter ( u8 v_value_u8 )

Parameters

v_value_u8 : The value of IIR filter coefficient

value	Filter coefficient
0x00	BME280_FILTER_COEFF_OFF
0x01	BME280_FILTER_COEFF_2
0x02	BME280_FILTER_COEFF_4
0x03	BME280_FILTER_COEFF_8
0x04	BME280_FILTER_COEFF_16

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_standby_durn ( u8 * v_standby_durn_u8 )

Parameters

v_standby_durn_u8

: The value of standby duration time value.

value	standby duration
0x00	BME280_STANDBY_TIME_1_MS
0x01	BME280_STANDBY_TIME_63_MS
0x02	BME280_STANDBY_TIME_125_MS
0x03	BME280_STANDBY_TIME_250_MS
0x04	BME280_STANDBY_TIME_500_MS
0x05	BME280_STANDBY_TIME_1000_MS
0x06	BME280_STANDBY_TIME_2000_MS
0x07	BME280_STANDBY_TIME_4000_MS

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

BME280_RETURN_FUNCTION_TYPE bme280_set_standby_durn ( u8 v_standby_durn_u8 )

Parameters

v_standby_durn_u8

: The value of standby duration time value.

value	standby duration
0x00	BME280_STANDBY_TIME_1_MS
0x01	BME280_STANDBY_TIME_63_MS
0x02	BME280_STANDBY_TIME_125_MS
0x03	BME280_STANDBY_TIME_250_MS
0x04	BME280_STANDBY_TIME_500_MS
0x05	BME280_STANDBY_TIME_1000_MS
0x06	BME280_STANDBY_TIME_2000_MS
0x07	BME280_STANDBY_TIME_4000_MS

Note: Normal mode comprises an automated perpetual cycling between an (active) Measurement period and an (inactive) standby period.; The standby time is determined by the contents of the register t_sb. Standby time can be set using BME280_STANDBY_TIME_125_MS.; Usage Hint : bme280_set_standby_durn(BME280_STANDBY_TIME_125_MS)

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_get_forced_uncomp_pressure_temperature_humidity	(	s32 *	v_uncom_pressure_s32,
		s32 *	v_uncom_temperature_s32,
		s32 *	v_uncom_humidity_s32
	)

Parameters

v_uncom_pressure_s32	The value of uncompensated pressure
v_uncom_temperature_s32	The value of uncompensated temperature
v_uncom_humidity_s32	The value of uncompensated humidity

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_write_register	(	u8	v_addr_u8,
		u8 *	v_data_u8,
		u8	v_len_u8
	)

Parameters

v_addr_u8	-> Address of the register
v_data_u8	-> The data from the register
v_len_u8	-> no of bytes to read

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_read_register	(	u8	v_addr_u8,
		u8 *	v_data_u8,
		u8	v_len_u8
	)

Parameters

v_addr_u8	-> Address of the register
v_data_u8	-> The data from the register
v_len_u8	-> no of bytes to read

Returns: results of bus communication function

Return values

0	-> Success
-1	-> Error

Here is the caller graph for this function:

double bme280_compensate_temperature_double ( s32 v_uncom_temperature_s32 )

Note: returns the value in Degree centigrade; Output value of "51.23" equals 51.23 DegC.

Parameters

v_uncom_temperature_s32 : value of uncompensated temperature

Returns: Return the actual temperature in floating point

double bme280_compensate_pressure_double ( s32 v_uncom_pressure_s32 )

Note: Returns pressure in Pa as double.; Output value of "96386.2" equals 96386.2 Pa = 963.862 hPa.

Parameters

v_uncom_pressure_s32 : value of uncompensated pressure

Returns: Return the actual pressure in floating point

double bme280_compensate_humidity_double ( s32 v_uncom_humidity_s32 )

Note: returns the value in relative humidity (rH); Output value of "42.12" equals 42.12 rH

Parameters

v_uncom_humidity_s32 : value of uncompensated humidity

Returns: Return the actual humidity in floating point

u32 bme280_compensate_pressure_int64 ( s32 v_uncom_pressure_s32 )

Note: Returns the value in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits).; Output value of "24674867" represents 24674867 / 256 = 96386.2 Pa = 963.862 hPa

Parameters

v_uncom_pressure_s32 : value of uncompensated temperature

Returns: Return the actual pressure in u32

Here is the caller graph for this function:

u32 bme280_compensate_pressure_int64_twentyfour_bit_output ( s32 v_uncom_pressure_s32 )

Note: Returns the value in Pa.; Output value of "12337434"; represents 12337434 / 128 = 96386.2 Pa = 963.862 hPa

Parameters

v_uncom_pressure_s32 : value of uncompensated pressure

Returns: the actual pressure in u32

Here is the call graph for this function:

BME280_RETURN_FUNCTION_TYPE bme280_compute_wait_time ( u8 * v_delaytime_u8 )

Parameters

v_delaytime_u8 : The value of delay time for force mode

Return values

0	-> Success

Here is the caller graph for this function:

Macro Definition Documentation

#define MACHINE_32_BIT

Note: While porting the API please consider the following; Please check the version of C standard; Are you using Linux platform

For the Linux platform support Please use the types.h for your data types definitions

By default it is defined as 32 bit machine configuration define your data types based on your machine/compiler/controller configuration

#define BME280_BUS_WR_RETURN_TYPE s8

Note: This includes types of parameters. This example shows the configuration for an SPI bus link.

If your communication function looks like this:

write_my_bus_xy(u8 device_addr, u8 register_addr, u8 * data, u8 length);

The BME280_WR_FUNC_PTR would equal:

BME280_WR_FUNC_PTR s8 (* bus_write)(u8, u8, u8 *, u8)

Parameters can be mixed as needed refer to the refer BME280_BUS_WRITE_FUNC macro.defines the return parameter type of the BME280_WR_FUNCTION

#define BME280_BUS_WR_PARAM_TYPES

Value:

u8, u8,\

u8 *, u8

u8

unsigned char u8

Definition: bme280driver.h:200

#define BME280_BUS_WRITE_FUNC	(	device_addr,
		register_addr,
		register_data,
		wr_len
	)

Value:

bus_write(device_addr, register_addr,\

register_data, wr_len)

#define BME280_BUS_RD_RETURN_TYPE s8

Note: The bus write function can change since this is a system dependant issue.

If the bus_read parameter calling order is like: reg_addr, reg_data, wr_len it would be as it is here.

If the parameters are differently ordered or your communication function like I2C need to know the device address, you can change this macro accordingly.

BME280_BUS_READ_FUNC(dev_addr, reg_addr, reg_data, wr_len)\ bus_read(dev_addr, reg_addr, reg_data, wr_len)

This macro lets all API functions call YOUR communication routine in a way that equals your definition in the refer BME280_WR_FUNC_PTR definition.

Note: : this macro also includes the "MSB='1' for reading BME280 addresses.

#define BME280_BUS_RD_PARAM_TYPES

Value:

(u8, u8,\

u8 *, u8)

u8

unsigned char u8

Definition: bme280driver.h:200

#define BME280_BUS_RD_PARAM_ORDER

Value:

(device_addr, register_addr,\

register_data)

#define BME280_BUS_READ_FUNC	(	device_addr,
		register_addr,
		register_data,
		rd_len
	)

Value:

bus_read(device_addr, register_addr,\

register_data, rd_len)

#define BME280_DATA_FRAME_SIZE (8)

data frames includes temperature, pressure and humidity

#define BME280_WR_FUNC_PTR

Value:

s8 (*bus_write)(u8, u8,\

u8 *, u8)

u8

unsigned char u8

Definition: bme280driver.h:200

s8

signed char s8

If your machine support 16 bit define the MACHINE_16_BIT.

Definition: bme280driver.h:194

#define BME280_RD_FUNC_PTR

Value:

s8 (*bus_read)(u8, u8,\

u8 *, u8)

u8

unsigned char u8

Definition: bme280driver.h:200

s8

signed char s8

If your machine support 16 bit define the MACHINE_16_BIT.

Definition: bme280driver.h:194

Typedef Documentation

typedef signed char s8

used for signed 8bit

typedef signed short int s16

used for signed 16bit

typedef signed int s32

used for signed 32bit

typedef signed long long int s64

used for signed 64bit

typedef unsigned char u8

used for unsigned 8bit

typedef unsigned short int u16

used for unsigned 16bit

typedef unsigned int u32

used for unsigned 32bit

typedef unsigned long long int u64

used for unsigned 64bit

Data Structures

Functions

Macros

Typedefs

Function Documentation

Macro Definition Documentation

Typedef Documentation