ak8975.c File Reference

Driver for the AKM AK8975 magnetometer. More...

#include "peripherals/ak8975.h"
#include "mcu_periph/sys_time.h"

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Macros
#define	AK8975_MEAS_TIME_MS   9
#define	RawFromBuf(_buf, _idx)   ((int16_t)(_buf[_idx] | (_buf[_idx+1] << 8)))
#define	Int16FromRaw(_raw)   ( (_raw & 0x1FFF) > 0xFFF ? (_raw & 0x1FFF) - 0x2000 : (_raw & 0x0FFF) )

Functions
static float	get_ajusted_value (const int16_t val, const uint8_t axis)
void	ak8975_init (struct Ak8975 *ak, struct i2c_periph *i2c_p, uint8_t addr)
void	ak8975_configure (struct Ak8975 *ak)
void	ak8975_read (struct Ak8975 *ak)
void	ak8975_event (struct Ak8975 *ak)

Variables
static float	calibration_values [3] = { 0, 0, 0 }

Detailed Description

Driver for the AKM AK8975 magnetometer.

Definition in file ak8975.c.

Macro Definition Documentation

AK8975_MEAS_TIME_MS

#define AK8975_MEAS_TIME_MS   9

Definition at line 31 of file ak8975.c.

Int16FromRaw

#define Int16FromRaw

(

_raw

)

( (_raw & 0x1FFF) > 0xFFF ? (_raw & 0x1FFF) - 0x2000 : (_raw & 0x0FFF) )

Definition at line 130 of file ak8975.c.

RawFromBuf

#define RawFromBuf	(		_buf,
			_idx
	)		((int16_t)(_buf[_idx] | (_buf[_idx+1] << 8)))

Definition at line 128 of file ak8975.c.

Function Documentation

ak8975_configure()

void ak8975_configure

(

struct Ak8975 *

ak

)

Definition at line 63 of file ak8975.c.

References AK8975_MODE_FUSE_ACCESS, AK8975_MODE_POWER_DOWN, AK8975_REG_ASASX, AK8975_REG_CNTL_ADDR, AK_CONF_REQUESTED, AK_CONF_UNINIT, AK_DISABLE_ACCESS_CALIBRATION, AK_REQ_CALIBRATION, i2c_transaction::buf, calibration_values, Ak8975::i2c_p, Ak8975::i2c_trans, i2c_transceive(), i2c_transmit(), I2CTransDone, I2CTransFailed, I2CTransSuccess, Ak8975::init_status, Ak8975::initialized, i2c_transaction::slave_addr, and i2c_transaction::status.

Referenced by ak8975_periodic().

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ak8975_event()

void ak8975_event

(

struct Ak8975 *

ak

)

Definition at line 131 of file ak8975.c.

References AK8975_MEAS_TIME_MS, AK8975_REG_ST1_ADDR, AK_STATUS_IDLE, AK_STATUS_MEAS, AK_STATUS_READ, i2c_transaction::buf, Ak8975::data, Ak8975::data_available, get_sys_time_msec(), Ak8975::i2c_p, Ak8975::i2c_trans, i2c_transceive(), I2CTransDone, I2CTransFailed, I2CTransSuccess, Ak8975::initialized, Int16FromRaw, Ak8975::last_meas_time, RawFromBuf, i2c_transaction::slave_addr, i2c_transaction::status, Ak8975::status, and val.

Referenced by imu_apogee_event().

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ak8975_init()

void ak8975_init	(	struct Ak8975 *	ak,
		struct i2c_periph *	i2c_p,
		uint8_t	addr
	)

Definition at line 47 of file ak8975.c.

References AK_CONF_UNINIT, AK_STATUS_IDLE, Ak8975::data_available, Ak8975::i2c_p, Ak8975::i2c_trans, I2CTransDone, Ak8975::init_status, Ak8975::initialized, i2c_transaction::slave_addr, i2c_transaction::status, and Ak8975::status.

Referenced by imu_apogee_init().

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ak8975_read()

void ak8975_read

(

struct Ak8975 *

ak

)

Definition at line 113 of file ak8975.c.

References AK8975_MODE_SINGLE_MEAS, AK8975_REG_CNTL_ADDR, AK_STATUS_IDLE, AK_STATUS_MEAS, i2c_transaction::buf, get_sys_time_msec(), Ak8975::i2c_p, Ak8975::i2c_trans, i2c_transmit(), Ak8975::last_meas_time, i2c_transaction::slave_addr, and Ak8975::status.

Referenced by ak8975_periodic().

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get_ajusted_value()

static float get_ajusted_value ( const int16_t  val, const uint8_t  axis  )

static

Definition at line 38 of file ak8975.c.

References calibration_values, H, and val.

Variable Documentation

calibration_values

float calibration_values[3] = { 0, 0, 0 }

static

Definition at line 36 of file ak8975.c.

Referenced by ak8975_configure(), and get_ajusted_value().