Driver for the Freescale MMA7660 3-Axis accelerometer. More...

Detailed Description

Driver for the Freescale MMA7660 3-Axis accelerometer.

This driver only implements basic functionality.

Files
file	mma7660.h
	Interface definition for the MMA7660 accelerometer driver.

file	mma7660_params.h
	Default configuration for MMA7660 accelerometer.

file	mma7660_reg.h
	Register definition for the MMA7660 accelerometer driver.

Data Structures
struct	mma7660_params_t
	Parameters for an MMA7660 device. More...

struct	mma7660_t
	Device descriptor for an MMA7660 device. More...

struct	mma7660_data_t
	Data type for the result data. More...

Enumerations
enum	{ MMA7660_OK , MMA7660_I2C_ERR , MMA7660_I2C_READ_ERR , MMA7660_I2C_WRITE_ERR , MMA7660_READ_ERR }
	Return codes. More...

Functions
int	mma7660_init (mma7660_t dev, const mma7660_params_t params)
	Initialize an MMA7660 device. More...

int	mma7660_set_mode (const mma7660_t *dev, uint8_t active, uint8_t autowake, uint8_t autosleep, uint8_t prescale)
	Set the mode register. More...

int	mma7660_read_tilt (const mma7660_t dev, uint8_t res)
	Read the tilt register. More...

int	mma7660_write_sleep_count (const mma7660_t *dev, uint8_t sleep)
	Write the sleep count register. More...

int	mma7660_config_interrupts (const mma7660_t *dev, uint8_t isource_flags)
	Configure the interrupt sources. More...

int	mma7660_config_samplerate (const mma7660_t *dev, uint8_t amsr, uint8_t awsr, uint8_t filt)
	Configure the sample rate. More...

int	mma7660_config_pdet (const mma7660_t *dev, uint8_t pdth, uint8_t enabled_axes)
	Configure the tap detection. More...

int	mma7660_config_pd (const mma7660_t *dev, uint8_t pd)
	Configure the tap detection debounce count. More...

int	mma7660_read (const mma7660_t dev, mma7660_data_t data)
	Read the acceleration counts converted to mG. More...

int	mma7660_read_counts (const mma7660_t dev, int8_t x, int8_t y, int8_t z)
	Read the acceleration counts (unconverted) More...

MMA7660 constants
#define	MODE_ACTIVE_SHIFT (0U)

#define	MODE_AUTOWAKE_SHIFT (3U)

#define	MODE_AUTOSLEEP_SHIFT (4U)

#define	MODE_PRESCALE_SHIFT (5U)

#define	MODE_INTERRUPT_DEFAULT (0x40) /* Active low, push-pull */

#define	MMA7660_INTSOURCE_NONE (0x00)

#define	MMA7660_INTSOURCE_FB (0x01)

#define	MMA7660_INTSOURCE_UDLR (0x02)

#define	MMA7660_INTSOURCE_TAP (0x04)

#define	MMA7660_INTSOURCE_AUTOSLEEP (0x08)

#define	MMA7660_INTSOURCE_MEASURE (0x10)

#define	MMA7660_INTSOURCE_SHX (0x20)

#define	MMA7660_INTSOURCE_SHY (0x40)

#define	MMA7660_INTSOURCE_SHZ (0x80)

#define	MMA7660_SR_AMPD (0x00)

#define	MMA7660_SR_AM64 (0x01)

#define	MMA7660_SR_AM32 (0x02)

#define	MMA7660_SR_AM16 (0x03)

#define	MMA7660_SR_AM8 (0x04)

#define	MMA7660_SR_AM4 (0x05)

#define	MMA7660_SR_AM2 (0x06)

#define	MMA7660_SR_AM1 (0x07)

#define	MMA7660_SR_AW32 (0x00)

#define	MMA7660_SR_AW16 (0x08)

#define	MMA7660_SR_AW8 (0x10)

#define	MMA7660_SR_AW1 (0x18)

#define	MMA7660_PDET_X (0x20)

#define	MMA7660_PDET_Y (0x40)

#define	MMA7660_PDET_Z (0x80)

#define	MMA7660_ADDR (0x4C)

#define	MMA7660_MG_PER_COUNT (47U)

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Return codes.

Enumerator
MMA7660_OK	all ok
MMA7660_I2C_ERR	i2c bus initialization error
MMA7660_I2C_READ_ERR	i2c bus cannot be read
MMA7660_I2C_WRITE_ERR	i2c bus cannot be written
MMA7660_READ_ERR	error when reading counts

Definition at line 37 of file mma7660.h.

Function Documentation

◆ mma7660_config_interrupts()

int mma7660_config_interrupts	(	const mma7660_t *	dev,
		uint8_t	isource_flags
	)

Configure the interrupt sources.

Parameters

[in]	dev	device descriptor
[in]	isource_flags	interrupt source flags

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_config_pd()

int mma7660_config_pd	(	const mma7660_t *	dev,
		uint8_t	pd
	)

Configure the tap detection debounce count.

Parameters

[in]	dev	device descriptor
[in]	pd	pulse debounce

See page 21 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for details about the debouncer

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_config_pdet()

int mma7660_config_pdet	(	const mma7660_t *	dev,
		uint8_t	pdth,
		uint8_t	enabled_axes
	)

Configure the tap detection.

Parameters

[in]	dev	device descriptor
[in]	pdth	pulse detection
[in]	enabled_axes	enabled axes

See page 21 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for details about the parameters

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_config_samplerate()

int mma7660_config_samplerate	(	const mma7660_t *	dev,
		uint8_t	amsr,
		uint8_t	awsr,
		uint8_t	filt
	)

Configure the sample rate.

Parameters

[in]	dev	device descriptor
[in]	amsr	active mode sample rate (pg 18 of DS)
[in]	awsr	auto wake sample rate (pg 19 of DS)
[in]	filt	filter samples (pg 19 of DS)

See datasheet http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for details about the parameters

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_init()

int mma7660_init	(	mma7660_t *	dev,
		const mma7660_params_t *	params
	)

Initialize an MMA7660 device.

Parameters

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

Returns: MMA7660_OK on success; -MMA7660_I2C_ERR on i2c bus initialization error; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_read()

int mma7660_read	(	const mma7660_t *	dev,
		mma7660_data_t *	data
	)

Read the acceleration counts converted to mG.

Parameters

[in]	dev	device descriptor
[out]	data	the acceleration data

Returns: MMA7660_OK on success; -MMA7660_I2C_READ_ERR on i2c bus read error

◆ mma7660_read_counts()

int mma7660_read_counts	(	const mma7660_t *	dev,
		int8_t *	x,
		int8_t *	y,
		int8_t *	z
	)

Read the acceleration counts (unconverted)

Parameters

[in]	dev	device descriptor
[out]	x	the X axis value
[out]	y	the Y axis value
[out]	z	the Z axis value

See page 28 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for conversion of acceleration counts to angles or G forces.

Returns: MMA7660_OK on success; -MMA7660_I2C_READ_ERR on i2c bus read error; -MMA7660_READ_ERR on general read error

◆ mma7660_read_tilt()

int mma7660_read_tilt	(	const mma7660_t *	dev,
		uint8_t *	res
	)

Read the tilt register.

Parameters

[in]	dev	device descriptor
[out]	res	tilt register contents

Returns: MMA7660_OK on success; -MMA7660_I2C_READ_ERR on i2c bus read error

◆ mma7660_set_mode()

int mma7660_set_mode	(	const mma7660_t *	dev,
		uint8_t	active,
		uint8_t	autowake,
		uint8_t	autosleep,
		uint8_t	prescale
	)

Set the mode register.

Parameters

[in]	dev	device descriptor
[in]	active	0=sleep 1=active
[in]	autowake	see datasheet
[in]	autosleep	see datasheet
[in]	prescale	main clock prescalar

See page 17 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for information about the parameters

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

◆ mma7660_write_sleep_count()

int mma7660_write_sleep_count	(	const mma7660_t *	dev,
		uint8_t	sleep
	)

Write the sleep count register.

Parameters

[in]	dev	device descriptor
[in]	sleep	sleep count

Returns: MMA7660_OK on success; -MMA7660_I2C_WRITE_ERR on i2c bus write error

Detailed Description

Files

Data Structures

Enumerations

Functions

MMA7660 constants

Enumeration Type Documentation

◆ anonymous enum

Function Documentation

◆ mma7660_config_interrupts()

◆ mma7660_config_pd()

◆ mma7660_config_pdet()

◆ mma7660_config_samplerate()

◆ mma7660_init()

◆ mma7660_read()

◆ mma7660_read_counts()

◆ mma7660_read_tilt()

◆ mma7660_set_mode()

◆ mma7660_write_sleep_count()