bmx280.h File Reference

Device driver interface for the BMP280 and BME280 sensors. More...

Detailed Description

Device driver interface for the BMP280 and BME280 sensors.

There are three sensor values that can be read: temperature, pressure and humidity. The BME280 device usually measures them all at once. It is possible to skip measuring either of the values by changing the oversampling settings. The driver is written in such a way that a measurement is only started from the function that reads the temperature. In other words, you always have to call bmx280_read_temperature, and then optionally you can call the other two.

Author

Kees Bakker kees@.nosp@m.soda.nosp@m.q.com

Alexandre Abadie alexa.nosp@m.ndre.nosp@m..abad.nosp@m.ie@i.nosp@m.nria..nosp@m.fr

Hauke Petersen hauke.nosp@m..pet.nosp@m.ersen.nosp@m.@fu-.nosp@m.berli.nosp@m.n.de

Definition in file bmx280.h.

#include <stdint.h>
#include "saul.h"
#include "periph/i2c.h"

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Go to the source code of this file.

Data Structures
struct	bmx280_calibration_t
	Calibration struct for the BMX280 sensor. More...
struct	bmx280_params_t
	Parameters for the BMX280 sensor. More...
struct	bmx280_t
	Device descriptor for the BMX280 sensor. More...

Macros
#define	BMX280_RAW_LEN   (6U)
	Select the number or raw data bytes depending on the device type.

Enumerations
enum	bmx280_t_sb_t {   BMX280_SB_0_5 = 0x00, BMX280_SB_62_5 = 0x20, BMX280_SB_125 = 0x40, BMX280_SB_250 = 0x60,   BMX280_SB_500 = 0x80, BMX280_SB_1000 = 0xa0, BMX280_SB_10 = 0xc0, BMX280_SB_20 = 0xe0 }
	Values for t_sb field of the BMX280 config register.
enum	bmx280_filter_t {   BMX280_FILTER_OFF = 0x00, BMX280_FILTER_2 = 0x04, BMX280_FILTER_4 = 0x08, BMX280_FILTER_8 = 0x0c,   BMX280_FILTER_16 = 0x10 }
	Values for filter field of the BMX280 config register.
enum	bmx280_mode_t { BMX280_MODE_SLEEP = 0x00, BMX280_MODE_FORCED = 0x01, BMX280_MODE_NORMAL = 0x03 }
	Values for mode field of the BMX280 ctrl_meas register.
enum	bmx280_osrs_t {   BMX280_OSRS_SKIPPED = 0x00, BMX280_OSRS_X1 = 0x01, BMX280_OSRS_X2 = 0x02, BMX280_OSRS_X4 = 0x03,   BMX280_OSRS_X8 = 0x04, BMX280_OSRS_X16 = 0x05 }
	Values for oversampling settings. More...
enum	{ BMX280_OK = 0, BMX280_ERR_BUS = -1, BMX280_ERR_NODEV = -2 }
	Status and error return codes. More...

Functions
int	bmx280_init (bmx280_t *dev, const bmx280_params_t *params)
	Initialize the given BMX280 device. More...
int16_t	bmx280_read_temperature (bmx280_t *dev)
	Read temperature value from the given BMX280 device. More...
uint32_t	bmx280_read_pressure (bmx280_t *dev)
	Read air pressure value from the given BMX280 device. More...
uint16_t	bme280_read_humidity (bmx280_t *dev)
	Read humidity value from the given BME280 device. More...

Variables
const saul_driver_t	bmx280_temperature_saul_driver
	Export of SAUL interface for temperature sensor.
const saul_driver_t	bmx280_pressure_saul_driver
	Export of SAUL interface for pressure sensor.