MEMS Sensors - Accelerometer MMA7341L

Low-level driver for the Accelerometer MMA7341L.

This driver provides access to the main features of the Accelerometer MMA7341L.

Macros
#define	MMA7341L_SAMPLES   16
#define	TAN15   17

Functions
void	mma7341l_calibration (void)
	Calibrate MMA7341L component and set the present axis value. More...
xyz_g_t	mma7341l_get_gravity_value (void)
	Get the gravity value of x,y,z axis. More...
uint32_t	mma7341l_get_rotation_dir (void)
	Check if the tilt angle is big enough. More...
static xyz_t	mma7341l_get_value (void)
	Get converted data from x,y,z axis. More...
void	mma7341l_init (void)
	Initialize MMA7341L. More...
void	mma7341l_set_mode (uint8_t uc_mode)
	Set MMA7341L working mode. More...
static void	mma7341l_update (void)
	Update ADC channel conversion value. More...
static xyz_t	mma7341l_xyz_add (xyz_t p, xyz_t q)
	Addition of two Position axis values. More...
static xyz_t	mma7341l_xyz_diff (xyz_t p, xyz_t q)
	Subtraction of two Position axis values. More...

Variables
acc_t	acc
static float	f_volt_0g
static float	f_volt_1g
static uint8_t	uc_adc_channel_x
static uint8_t	uc_adc_channel_y
static uint8_t	uc_adc_channel_z

#define MMA7341L_SAMPLES   16

Referenced by mma7341l_calibration().

#define TAN15   17

Referenced by mma7341l_get_rotation_dir().

void mma7341l_calibration

(

void

)

Calibrate MMA7341L component and set the present axis value.

References acc_t::k, acc_t::m, mma7341l_get_value(), MMA7341L_SAMPLES, mma7341l_xyz_add(), xyz_t::x, xyz_t::y, and xyz_t::z.

xyz_g_t mma7341l_get_gravity_value

(

void

)

Get the gravity value of x,y,z axis.

Returns

Gravity value of x,y,z axis.

References f_volt_0g, acc_t::m, mma7341l_update(), xyz_t::x, xyz_g_t::x_g, xyz_t::y, xyz_g_t::y_g, xyz_t::z, and xyz_g_t::z_g.

uint32_t mma7341l_get_rotation_dir

(

void

)

Check if the tilt angle is big enough.

If yes, get rotation direction according to the sign of two axes.

Returns

Rotation direction.

References acc_t::ak, acc_t::k, acc_t::m, MMA7341L_1G, MMA7341L_DOWM_RIGHT, MMA7341L_DOWN, MMA7341L_DOWN_LEFT, MMA7341L_LEFT, MMA7341L_RIGHT, MMA7341L_UNCHANGED, MMA7341L_UP, MMA7341L_UP_LEFT, MMA7341L_UP_RIGHT, mma7341l_update(), mma7341l_xyz_diff(), TAN15, xyz_t::x, xyz_t::y, and xyz_t::z.

static xyz_t mma7341l_get_value ( void  )

static

Get converted data from x,y,z axis.

Returns

Converted data for three channels.

References MMA7341L_SHIFT, xyz_t::x, xyz_t::y, and xyz_t::z.

Referenced by mma7341l_calibration(), and mma7341l_update().

void mma7341l_init

(

void

)

Initialize MMA7341L.

References MMA7341L_ADC_CHANNEL_X, MMA7341L_ADC_CHANNEL_Y, and MMA7341L_ADC_CHANNEL_Z.

void mma7341l_set_mode

(

uint8_t

uc_mode

)

Set MMA7341L working mode.

Parameters

uc_mode

Working mode value (1 is normal and 0 is sleep).

References gpio_set_pin_high, and gpio_set_pin_low.

static void mma7341l_update ( void  )

static

Update ADC channel conversion value.

References acc_t::m, and mma7341l_get_value().

Referenced by mma7341l_get_gravity_value(), and mma7341l_get_rotation_dir().

static xyz_t mma7341l_xyz_add ( xyz_t  p, xyz_t  q  )

static

Addition of two Position axis values.

Returns

The addition value.

References xyz_t::x, xyz_t::y, and xyz_t::z.

Referenced by mma7341l_calibration().

static xyz_t mma7341l_xyz_diff ( xyz_t  p, xyz_t  q  )

static

Subtraction of two Position axis values.

Returns

The subtraction value.

References xyz_t::x, xyz_t::y, and xyz_t::z.

Referenced by mma7341l_get_rotation_dir().

acc_t acc

Initial value:

= {
    .m = {.x = 0,.y = 0,.z = 0},
    .k = {.x = MMA7341L_ZERO_X,.y = MMA7341L_ZERO_Y,.z = MMA7341L_ZERO_Z},
    .ak = {.x = 0,.y = 0,.z = 0},
}

Referenced by inet_chksum_pbuf(), inet_chksum_pseudo(), and inet_chksum_pseudo_partial().

float f_volt_0g

static

Referenced by mma7341l_get_gravity_value().

float f_volt_1g

static

uint8_t uc_adc_channel_x

static

uint8_t uc_adc_channel_y

static

uint8_t uc_adc_channel_z

static