mma7660.h

Interface definition for the MMA7660 accelerometer driver.

MODE_ACTIVE_SHIFT
1
(0U)
MODE_AUTOWAKE_SHIFT
1
(3U)
MODE_AUTOSLEEP_SHIFT
1
(4U)
MODE_PRESCALE_SHIFT
1
(5U)
MODE_INTERRUPT_DEFAULT
1
(0x40) /* Active low, push-pull */
MMA7660_INTSOURCE_NONE
1
(0x00)
MMA7660_INTSOURCE_FB
1
(0x01)
MMA7660_INTSOURCE_UDLR
1
(0x02)
MMA7660_INTSOURCE_TAP
1
(0x04)
MMA7660_INTSOURCE_AUTOSLEEP
1
(0x08)
MMA7660_INTSOURCE_MEASURE
1
(0x10)
MMA7660_INTSOURCE_SHX
1
(0x20)
MMA7660_INTSOURCE_SHY
1
(0x40)
MMA7660_INTSOURCE_SHZ
1
(0x80)
MMA7660_SR_AMPD
1
(0x00)
MMA7660_SR_AM64
1
(0x01)
MMA7660_SR_AM32
1
(0x02)
MMA7660_SR_AM16
1
(0x03)
MMA7660_SR_AM8
1
(0x04)
MMA7660_SR_AM4
1
(0x05)
MMA7660_SR_AM2
1
(0x06)
MMA7660_SR_AM1
1
(0x07)
MMA7660_SR_AW32
1
(0x00)
MMA7660_SR_AW16
1
(0x08)
MMA7660_SR_AW8
1
(0x10)
MMA7660_SR_AW1
1
(0x18)
MMA7660_PDET_X
1
(0x20)
MMA7660_PDET_Y
1
(0x40)
MMA7660_PDET_Z
1
(0x80)
MMA7660_ADDR
1
(0x4C)
MMA7660_MG_PER_COUNT
1
(47U)
enum @133
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
int mma7660_init(mma7660_t * dev, const mma7660_params_t * params)

Initialize an MMA7660 device.

Parameters

dev:device descriptor
params:device configuration parameters

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_ERR on i2c bus initialization error
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
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

dev:device descriptor
active:0=sleep 1=active
autowake:see datasheet
autosleep:see datasheet
prescale:main clock prescalar
See page 17 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for information about the parameters

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_read_tilt(const mma7660_t * dev, uint8_t * res)

Read the tilt register.

Parameters

dev:device descriptor
res:tilt register contents

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_READ_ERR on i2c bus read error
int mma7660_write_sleep_count(const mma7660_t * dev, uint8_t sleep)

Write the sleep count register.

Parameters

dev:device descriptor
sleep:sleep count

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_config_interrupts(const mma7660_t * dev, uint8_t isource_flags)

Configure the interrupt sources.

Parameters

dev:device descriptor
isource_flags:interrupt source flags

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_config_samplerate(const mma7660_t * dev, uint8_t amsr, uint8_t awsr, uint8_t filt)

Configure the sample rate.

Parameters

dev:device descriptor
amsr:active mode sample rate (pg 18 of DS)
awsr:auto wake sample rate (pg 19 of DS)
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

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_config_pdet(const mma7660_t * dev, uint8_t pdth, uint8_t enabled_axes)

Configure the tap detection.

Parameters

dev:device descriptor
pdth:pulse detection
enabled_axes:enabled axes
See page 21 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for details about the parameters

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_config_pd(const mma7660_t * dev, uint8_t pd)

Configure the tap detection debounce count.

Parameters

dev:device descriptor
pd:pulse debounce
See page 21 of http://www.nxp.com/files/sensors/doc/data_sheet/MMA7660FC.pdf for details about the debouncer

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_WRITE_ERR on i2c bus write error
int mma7660_read(const mma7660_t * dev, mma7660_data_t * data)

Read the acceleration counts converted to mG.

Parameters

dev:device descriptor
data:the acceleration data

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_READ_ERR on i2c bus read error
int mma7660_read_counts(const mma7660_t * dev, int8_t * x, int8_t * y, int8_t * z)

Read the acceleration counts (unconverted)

Parameters

dev:device descriptor
x:the X axis value
y:the Y axis value
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.

Return values

  • MMA7660_OK on success
  • -MMA7660_I2C_READ_ERR on i2c bus read error
  • -MMA7660_READ_ERR on general read error
struct mma7660_params_t

Parameters for an MMA7660 device.

i2c.h::i2c_t i2c

the I2C handle

uint8_t addr

the device I2C address

uint8_t amsr

active mode sample rate

uint8_t awsr

auto wake sample rate

uint8_t filt

filter samples

struct mma7660_t

Device descriptor for an MMA7660 device.

mma7660_params_t params

initialization parameters

struct mma7660_data_t

Data type for the result data.

int16_t x

acceleration in X direction

int16_t y

acceleration in Y direction

int16_t z

acceleration in Z direction