Functions

Collaboration diagram for Functions:

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

Detailed Description

Function Documentation

bme280_busy_check()

static int8_t bme280_busy_check ( BME280_t *  Dev )

static

check if sensor is busy

Function reads "status" register and checks value of two its bits returns BME280_BUSY_ERR if any of them is set

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bme280_compensate_h_u32t()

static BME280_U32_t bme280_compensate_h_u32t ( BME280_t *  Dev, BME280_S32_t  adc_H  )

static

compensate humidity value

Function returns compensated humidity in RH as unsigned 32bit integer. Output value of "47445" represents 47445/1000 = 47.445 RH

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bme280_compensate_p_u32t()

static BME280_U32_t bme280_compensate_p_u32t ( BME280_t *  Dev, BME280_S32_t  adc_P  )

static

compensate pressure value

Function returns compensated pressure in Pa as unsigned 32 bit integer. Output value depends of USE_64BIT configuration.

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bme280_compensate_t_s32t()

static BME280_S32_t bme280_compensate_t_s32t ( BME280_t *  Dev, BME280_S32_t  adc_T  )

static

compensate temperature value

Function returns compensated temperature in DegC, resolution is 0.01 DegC. Output value of “5123” equals 51.23 DegC. It calculates t_fine variable stored inside *Dev structure as well.

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bme280_convert_h_U32_float()

static void bme280_convert_h_U32_float ( BME280_U32_t  hum_in, float *  hum_out  )

static

convert humidity to structure

Function converts humidity stored in BME280_U32_t to float variable

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bme280_convert_h_U32_struct()

static void bme280_convert_h_U32_struct ( BME280_U32_t  hum, BME280_Data_t *  data  )

static

convert humidity to structure

Function converts humidity stored in BME280_U32_t to BME280_Data_t structure

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bme280_convert_p_U32_float()

static void bme280_convert_p_U32_float ( BME280_U32_t  press_in, float *  press_out  )

static

convert pressure to structure

Function converts pressure stored in BME280_U32_t to float variable

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bme280_convert_p_U32_struct()

static void bme280_convert_p_U32_struct ( BME280_U32_t  press, BME280_Data_t *  data  )

static

convert pressure to structure

Function converts pressure stored in BME280_U32_t to BME280_Data_t structure

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bme280_convert_t_S32_float()

static void bme280_convert_t_S32_float ( BME280_S32_t  temp_in, float *  temp_out  )

static

convert temperature to float

Function converts temperature stored in BME280_S32_t to float variable

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bme280_convert_t_S32_struct()

static void bme280_convert_t_S32_struct ( BME280_S32_t  temp, BME280_Data_t *  data  )

static

convert temperature to structure

Function converts temperature stored in BME280_S32_t to BME280_Data_t structure

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bme280_is_normal_mode()

static int8_t bme280_is_normal_mode ( BME280_t *  Dev )

static

check for normal mode

Function checks if device is initializes and if it's status in *Dev structure is set as "normal_mode"

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bme280_is_sleep_mode()

static int8_t bme280_is_sleep_mode ( BME280_t *  Dev )

static

check for sleep mode

Function checks if device is initializes and if it's status in *Dev structure is set as "sleep_mode"

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bme280_osrs_to_oversampling()

static void bme280_osrs_to_oversampling ( uint8_t *  osrs )

static

change osrs_x reg value to oversampling

Function converts register value to oversampling value f.e. osrs_p = 0x04 then pressure oversampling = x8

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bme280_parse_hum_s32t()

static BME280_S32_t bme280_parse_hum_s32t ( uint8_t *  raw )

static

convert buffer to single variable

Function converts raw adc values of humidity to single BME280_S32_t variable

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bme280_parse_press_temp_s32t()

static BME280_S32_t bme280_parse_press_temp_s32t ( uint8_t *  raw )

static

convert buffer to single variable

Function converts raw adc values of temperature or pressure to single BME280_S32_t variable

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bme280_read_compensate()

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  )

static

read and compensate measured values

Function reads selected adc values from sensor, converts them into single variables and compensate with calibration data stored in BME280_calibration_data inside *Dev structure. These variales are then returned as single integer values.

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bme280_read_compensation_parameters()

static int8_t bme280_read_compensation_parameters ( BME280_t *  Dev )

static

read compensation data

Function reads individual compensation data from sensor and stores them into BME280_calibration_data inside *Dev structure

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bme280_set_forced_mode()

static int8_t bme280_set_forced_mode ( BME280_t *  Dev, uint8_t *  delay  )

static

check and set forced mode

Function checks if conditions to set forced mode are met, calculates and returns required delay time (via *delay pointer) then sets forced mode

0xFC - 0b11111100

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