BMP180 temperature and pressure sensor

Device driver interface for the BMP180 sensor. More...

Detailed Description

Device driver interface for the BMP180 sensor.

This driver provides [S]ensor [A]ctuator [U]ber [L]ayer capabilities.

Files
file	bmp180_internals.h
	Internal addresses, registers, constants for the BMP180 sensor.
file	bmp180_params.h
	Default configuration for BMP180.
file	bmp180.h
	Device driver interface for the BMP180 sensor.

Data Structures
struct	bmp180_calibration_t
	Calibration struct for the BMP180 sensor. More...
struct	bmp180_params_t
	Device initialization parameters. More...
struct	bmp180_t
	Device descriptor for the BMP180 sensor. More...

Enumerations
enum	bmp180_oversampling_mode_t { BMP180_ULTRALOWPOWER = 0 , BMP180_STANDARD , BMP180_HIGHRES , BMP180_ULTRAHIGHRES }
	Oversampling modes. More...
enum	{ BMP180_OK = 0 , BMP180_ERR_NODEV , BMP180_ERR_NOCAL }
	Status and error return codes. More...

Functions
int	bmp180_init (bmp180_t *dev, const bmp180_params_t *params)
	Initialize the given BMP180 device.
int16_t	bmp180_read_temperature (const bmp180_t *dev)
	Read temperature value from the given BMP180 device, returned in d°C.
uint32_t	bmp180_read_pressure (const bmp180_t *dev)
	Read pressure value from the given BMP180 device, returned in Pa.
int16_t	bmp180_altitude (const bmp180_t *dev, uint32_t pressure_0)
	Compute altitude, returned in m.
uint32_t	bmp180_sealevel_pressure (const bmp180_t *dev, int16_t altitude)
	Compute pressure at sea level, returned in Pa.

Enumeration Type Documentation

anonymous enum

anonymous enum

Status and error return codes.

Enumerator
BMP180_OK	everything was fine
BMP180_ERR_NODEV	did not detect BMP180
BMP180_ERR_NOCAL	error when reading calibration values

Definition at line 81 of file bmp180.h.

bmp180_oversampling_mode_t

enum bmp180_oversampling_mode_t

Oversampling modes.

Definition at line 37 of file bmp180.h.

Function Documentation

bmp180_altitude()

int16_t bmp180_altitude	(	const bmp180_t *	dev,
		uint32_t	pressure_0
	)

Compute altitude, returned in m.

Parameters

[in]	dev	Device descriptor of BMP180 device to read from
[in]	pressure_0	The pressure at sea level in Pa

Returns

Altitude in m

bmp180_init()

int bmp180_init	(	bmp180_t *	dev,
		const bmp180_params_t *	params
	)

Initialize the given BMP180 device.

Parameters

[out]	dev	Initialized device descriptor of BMP180 device
[in]	params	Initialization parameters

Returns

BMP180_OK on success

-BMP180_ERR_NODEV if not a BMP180 at given address

-BMP180_ERR_NOCAL if an error occurred when reading calibration values

bmp180_read_pressure()

uint32_t bmp180_read_pressure

(

const bmp180_t *

dev

)

Read pressure value from the given BMP180 device, returned in Pa.

Parameters

[in]

dev

Device descriptor of BMP180 device to read from

Returns

Pressure in Pa

bmp180_read_temperature()

int16_t bmp180_read_temperature

(

const bmp180_t *

dev

)

Read temperature value from the given BMP180 device, returned in d°C.

Parameters

[in]

dev

Device descriptor of BMP180 device to read from

Returns

Temperature in d°C

bmp180_sealevel_pressure()

uint32_t bmp180_sealevel_pressure	(	const bmp180_t *	dev,
		int16_t	altitude
	)

Compute pressure at sea level, returned in Pa.

Parameters

[in]	dev	Device descriptor of BMP180 device to read from
[in]	altitude	Altitude in m

Returns

Pressure at sea level in Pa