FXOS8700 3-axis accelerometer/magnetometer

Driver for the FXOS8700 3-axis accelerometer/magnetometer. More...

Detailed Description

Driver for the FXOS8700 3-axis accelerometer/magnetometer.

The connection between the MCU and the FXOS8700 is based on the I2C-interface.

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

Modules
	FXOS8700 accelerometer/magnetometer driver compile configuration

Files
file	fxos8700_params.h
	Default configuration for FXOS8700 devices.
file	fxos8700_regs.h
	Register definitions for FXOS8700 devices.
file	fxos8700.h
	Interface definition for the FXOS8700 sensor driver.

Data Structures
struct	fxos8700_params_t
	Parameters needed for device initialization. More...
struct	fxos8700_measurement_t
	Individual 3-axis measurement. More...
struct	fxos8700_t
	Device descriptor for a FXOS8700 device. More...

Enumerations
enum	{   FXOS8700_OK = 0 , FXOS8700_ADDRERR = -1 , FXOS8700_NOBUS = -2 , FXOS8700_NODEV = -3 ,   FXOS8700_BUSERR = -4 }
	FXOS8700 specific return values. More...

Functions
int	fxos8700_init (fxos8700_t *dev, const fxos8700_params_t *params)
	Initialize an FXOS8700 device. More...
int	fxos8700_set_active (const fxos8700_t *dev)
	Convenience function for turning on the FXOS8700. More...
int	fxos8700_set_idle (const fxos8700_t *dev)
	Convenience function for turning off the FXOS8700. More...
int	fxos8700_read (const fxos8700_t *dev, fxos8700_measurement_t *acc, fxos8700_measurement_t *mag)
	Convenience function for reading acceleration and magnetic field. More...
int	fxos8700_read_cached (const void *dev, fxos8700_measurement_t *acc, fxos8700_measurement_t *mag)
	Extended read function including caching capability. More...

Enumeration Type Documentation

anonymous enum

anonymous enum

FXOS8700 specific return values.

Enumerator
FXOS8700_OK	everything went as expected
FXOS8700_ADDRERR	no FXOS8700 device found on the bus
FXOS8700_NOBUS	errors while initializing the I2C bus
FXOS8700_NODEV	no FXOS8700 device found on the bus
FXOS8700_BUSERR	error during I2C communication

Definition at line 57 of file fxos8700.h.

Function Documentation

fxos8700_init()

int fxos8700_init	(	fxos8700_t *	dev,
		const fxos8700_params_t *	params
	)

Initialize an FXOS8700 device.

Parameters

[out]	dev	device descriptor
[in]	params	parameters for device

Returns

FXOS8700_OK on success

FXOS8700_NOBUS on I2C initialization error

FXOS8700_BUSERR on I2C communication error

FXOS8700_ADDRERR on invalid address

FXOS8700_NODEV if no FXOS8700 device found on bus

fxos8700_read()

int fxos8700_read	(	const fxos8700_t *	dev,
		fxos8700_measurement_t *	acc,
		fxos8700_measurement_t *	mag
	)

Convenience function for reading acceleration and magnetic field.

This function will trigger a new conversion, wait for the conversion to be finished and the get the results from the device.

Parameters

[in]	dev	device descriptor of sensor
[out]	acc	3-axis acceleration [in milli grativy acceleration (mg) ]
[out]	mag	3-axis magnetic field [in degree milli Gauss (mGs) ]

Returns

FXOS8700_OK on success

FXOS8700_BUSERR on I2C communication failures

fxos8700_read_cached()

int fxos8700_read_cached	(	const void *	dev,
		fxos8700_measurement_t *	acc,
		fxos8700_measurement_t *	mag
	)

Extended read function including caching capability.

This function will return cached values if they are within the sampling period (FXOS8700_RENEW_INTERVAL), or will trigger a new conversion, wait for the conversion to be finished and the get the results from the device.

Parameters

[in]	dev	device descriptor of sensor
[out]	acc	3-axis acceleration [in milli grativy acceleration (mg) ]
[out]	mag	3-axis magnetic field [in degree milli Gauss (mGs) ]

Returns

FXOS8700_OK on success

FXOS8700_BUSERR on I2C communication failures

fxos8700_set_active()

int fxos8700_set_active

(

const fxos8700_t *

dev

)

Convenience function for turning on the FXOS8700.

This function will trigger a new conversion, wait for the conversion to be finished and the get the results from the device.

Parameters

[in]

dev

device descriptor of sensor

Returns

FXOS8700_OK on success

FXOS8700_BUSERR on I2C communication failures

fxos8700_set_idle()

int fxos8700_set_idle

(

const fxos8700_t *

dev

)

Convenience function for turning off the FXOS8700.

This function will trigger a new conversion, wait for the conversion to be finished and the get the results from the device.

Parameters

[in]

dev

device descriptor of sensor

Returns

FXOS8700_OK on success

FXOS8700_BUSERR on I2C communication failures