Source code for BME280 Driver. More...

#include <stdint.h>
#include <stddef.h>
#include "bme280.h"

Include dependency graph for bme280.c:

Data Structures
struct	adc_regs
	keeps raw adc values from sensor, used in bme280_read_compensate function More...

Macros
#define	CAT_I16T(msb, lsb) ((int16_t)(((int16_t)msb << 8) \| (int16_t)lsb))
	concatenate two bytes into signed half-word

#define	CAT_UI16T(msb, lsb) ((uint16_t)(((uint16_t)msb << 8) \| (uint16_t)lsb))
	concatenate two bytes into unsigned half-word

#define	IS_NULL(x) ((NULL == x))
	check if x is null

Enumerations
enum	{ read_all = 0 , read_temp , read_press , read_hum }
	type of read, used as parameter to call bme280_read_compensate function

enum	{ sleep_mode = 0x00 , forced_mode = 0x01 , normal_mode = 0x03 }
	possible value of "mode" variable inside BME280_t structure

enum	{ not_initialized = 0x00 , initialized }
	possible value of "initialized" variabie inside BME280_t structure

Functions
static int8_t	bme280_read_compensation_parameters (BME280_t *Dev)
	read compensation data

static int8_t	bme280_read_compensate (uint8_t read_type, BME280_t Dev, BME280_S32_t temp, BME280_U32_t press, BME280_U32_t hum)
	read and compensate measured values

static BME280_S32_t	bme280_parse_press_temp_s32t (uint8_t *raw)
	convert buffer to single variable

static BME280_S32_t	bme280_parse_hum_s32t (uint8_t *raw)
	convert buffer to single variable

static BME280_S32_t	bme280_compensate_t_s32t (BME280_t *Dev, BME280_S32_t adc_T)
	compensate temperature value

static BME280_U32_t	bme280_compensate_p_u32t (BME280_t *Dev, BME280_S32_t adc_P)
	compensate pressure value

static BME280_U32_t	bme280_compensate_h_u32t (BME280_t *Dev, BME280_S32_t adc_H)
	compensate humidity value

static void	bme280_convert_t_S32_struct (BME280_S32_t temp, BME280_Data_t *data)
	convert temperature to structure

static void	bme280_convert_t_S32_float (BME280_S32_t temp_in, float *temp_out)
	convert temperature to float

static void	bme280_convert_p_U32_struct (BME280_U32_t press, BME280_Data_t *data)
	convert pressure to structure

static void	bme280_convert_p_U32_float (BME280_U32_t press_in, float *press_out)
	convert pressure to structure

static void	bme280_convert_h_U32_struct (BME280_U32_t hum, BME280_Data_t *data)
	convert humidity to structure

static void	bme280_convert_h_U32_float (BME280_U32_t hum_in, float *hum_out)
	convert humidity to structure

static int8_t	bme280_is_normal_mode (BME280_t *Dev)
	check for normal mode

static int8_t	bme280_is_sleep_mode (BME280_t *Dev)
	check for sleep mode

static int8_t	bme280_set_forced_mode (BME280_t Dev, uint8_t delay)
	check and set forced mode

static void	bme280_osrs_to_oversampling (uint8_t *osrs)
	change osrs_x reg value to oversampling

static int8_t	bme280_busy_check (BME280_t *Dev)
	check if sensor is busy

int8_t	BME280_Init (BME280_t Dev, BME280_Driver_t Driver)
	Function to initialize sensor and resources.

int8_t	BME280_ConfigureAll (BME280_t Dev, BME280_Config_t Config)
	Function to set all sensor settings at once.

int8_t	BME280_Reset (BME280_t *Dev)
	Function to perform sensor's software reset.

int8_t	BME280_GetMode (BME280_t Dev, uint8_t Mode)
	Function gets current Operating Mode from sensor.

int8_t	BME280_GetPOvs (BME280_t Dev, uint8_t POvs)
	Function gets current pressure Oversampling from sensor.

int8_t	BME280_GetTOvs (BME280_t Dev, uint8_t TOvs)
	Function gets current temperature Oversampling from sensor.

int8_t	BME280_GetHOvs (BME280_t Dev, uint8_t HOvs)
	Function gets current humidity Oversampling from sensor.

int8_t	BME280_GetTStby (BME280_t Dev, uint8_t TStby)
	Function gets current Standby Time from sensor.

int8_t	BME280_GetTFilter (BME280_t Dev, uint8_t Filter)
	Function gets current IIR Filter coeficient from sensor.

int8_t	BME280_Is3WireSPIEnabled (BME280_t Dev, uint8_t Result)
	Function checks if 3-wire SPI is enabled.

int8_t	BME280_SetMode (BME280_t *Dev, uint8_t Mode)
	Function sets sensor's Operating Mode.

int8_t	BME280_SetPOvs (BME280_t *Dev, uint8_t POvs)
	Function sets sensor's pressure Oversampling.

int8_t	BME280_SetTOvs (BME280_t *Dev, uint8_t TOvs)
	Function sets sensor's temperature Oversampling.

int8_t	BME280_SetHOvs (BME280_t *Dev, uint8_t HOvs)
	Function sets sensor's humidity Oversampling.

int8_t	BME280_SetTStby (BME280_t *Dev, uint8_t TStby)
	Function sets sensor's Standby Time.

int8_t	BME280_SetFilter (BME280_t *Dev, uint8_t Filter)
	Function sets sensor's IIR Filter coeficient.

int8_t	BME280_Enable3WireSPI (BME280_t *Dev)
	Function enables 3-wire SPI bus.

int8_t	BME280_Disable3WireSPI (BME280_t *Dev)
	Function disables 3-wire SPI bus.

int8_t	BME280_ReadAllLast (BME280_t Dev, BME280_Data_t Data)
	Function reads all measured data at once.

int8_t	BME280_ReadTempLast (BME280_t Dev, int8_t TempInt, uint8_t *TempFract)
	Function reads last measured temperature.

int8_t	BME280_ReadPressLast (BME280_t Dev, uint16_t PressInt, uint16_t *PressFract)
	Function reads last measured pressure.

int8_t	BME280_ReadHumLast (BME280_t Dev, uint8_t HumInt, uint16_t *HumFract)
	Function reads last measured humidity.

int8_t	BME280_ReadAllForce (BME280_t Dev, BME280_Data_t Data)
	Function forces single measure and returns all data as integers.

int8_t	BME280_ReadTempForce (BME280_t Dev, int8_t TempInt, uint8_t *TempFract)
	Function forces single measure and returns temperatrue as integers (forced mode)

int8_t	BME280_ReadPressForce (BME280_t Dev, uint16_t PressInt, uint16_t *PressFract)
	Function forces single measure and returns pressure as integers (forced mode)

int8_t	BME280_ReadHumForce (BME280_t Dev, uint8_t HumInt, uint16_t *HumFract)
	Function forces single measure and returns humidity as integers (forced mode)

int8_t	BME280_ReadAllLast_F (BME280_t Dev, BME280_DataF_t Data)
	Function reads all measured data at once.

int8_t	BME280_ReadTempLast_F (BME280_t Dev, float Temp)
	Function reads last measured temperature.

int8_t	BME280_ReadPressLast_F (BME280_t Dev, float Press)
	Function reads last measured pressure.

int8_t	BME280_ReadHumLast_F (BME280_t Dev, float Hum)
	Function reads last measured humidity.

int8_t	BME280_ReadAllForce_F (BME280_t Dev, BME280_DataF_t Data)
	Function forces single measure and returns all data as floats.

int8_t	BME280_ReadTempForce_F (BME280_t Dev, float Temp)
	Function forces single measure and returns temperatrue as floats (forced mode)

int8_t	BME280_ReadPressForce_F (BME280_t Dev, float Press)
	Function forces single measure and returns pressure as floats (forced mode)

int8_t	BME280_ReadHumForce_F (BME280_t Dev, float Hum)
	Function forces single measure and returns humidity as floats (forced mode)

Variables
uint8_t	press_raw [BME280_PRESS_ADC_LEN]
	keeps raw adc value of pressure

uint8_t	temp_raw [BME280_TEMP_ADC_LEN]
	keeps raw adc value of temperature

uint8_t	hum_raw [BME280_HUM_ADC_LEN]
	keeps raw adc value of humidity

Detailed Description

Source code for BME280 Driver.

Author: Łukasz Juraszek / JuraszekL

Date: 20.04.2023

Note: https://github.com/JuraszekL/BME280_Driver

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description