Internal: Dynamics Functions

Classes
struct	vec3i_t

Macros
#define	WIIMOTE_ACCEL_XBITS   2
#define	WIIMOTE_ACCEL_YBITS   1
#define	WIIMOTE_ACCEL_ZBITS   1
#define	WIIMOTE_ACCEL_XSHIFT   0
#define	WIIMOTE_ACCEL_YSHIFT   0
#define	WIIMOTE_ACCEL_ZSHIFT   0
#define	NUNCHUK_ACCEL_XSHIFT   0
#define	NUNCHUK_ACCEL_YSHIFT   0
#define	NUNCHUK_ACCEL_ZSHIFT   0
#define	NUNCHUK_PASSTHROUGH_ACCEL_XSHIFT   0
#define	NUNCHUK_PASSTHROUGH_ACCEL_YSHIFT   0
#define	NUNCHUK_PASSTHROUGH_ACCEL_ZSHIFT   0

Functions
struct vec3i_t	wiiuse_scale_calibration (const struct vec3b_t *cal, const struct vec3b_t *cal_lsb, int accel_xshift, int accel_yshift, int accel_zshift)
	Scale an 8-bit calibration point up to the raw accel value's scale, per axis, filling in any real extra-precision bits decoded for it along the way. More...
void	calculate_orientation (struct accel_t *ac, struct vec3w_t *accel, struct orient_t *orient, int smooth, int accel_xshift, int accel_yshift, int accel_zshift)
	Calculate the roll, pitch, yaw. More...
void	calculate_gforce (struct accel_t *ac, struct vec3w_t *accel, struct gforce_t *gforce, int accel_xshift, int accel_yshift, int accel_zshift)
	Calculate the gravity forces on each axis. More...
void	calc_joystick_state (struct joystick_t *js, float x, float y)
	Calculate the angle and magnitude of a joystick. More...
void	apply_smoothing (struct accel_t *ac, struct orient_t *orient, int type)

Detailed Description

Function Documentation

calc_joystick_state()

void calc_joystick_state	(	struct joystick_t *	js,
		float	x,
		float	y
	)

Calculate the angle and magnitude of a joystick.

Parameters

js	[out] Pointer to a joystick_t structure.
x	The raw x-axis value.
y	The raw y-axis value.

calculate_gforce()

void calculate_gforce	(	struct accel_t *	ac,
		struct vec3w_t *	accel,
		struct gforce_t *	gforce,
		int	accel_xshift,
		int	accel_yshift,
		int	accel_zshift
	)

Calculate the gravity forces on each axis.

Parameters

ac	An accelerometer (accel_t) structure.
accel	[in] Pointer to a vec3w_t structure that holds the raw acceleration data.
gforce	[out] Pointer to a gforce_t structure that will hold the gravity force data.
accel_xshift	[in] See calculate_orientation().
accel_yshift	[in] See calculate_orientation().
accel_zshift	[in] See calculate_orientation().

calculate_orientation()

void calculate_orientation	(	struct accel_t *	ac,
		struct vec3w_t *	accel,
		struct orient_t *	orient,
		int	smooth,
		int	accel_xshift,
		int	accel_yshift,
		int	accel_zshift
	)

Calculate the roll, pitch, yaw.

Parameters

ac	An accelerometer (accel_t) structure.
accel	[in] Pointer to a vec3w_t structure that holds the raw acceleration data.
orient	[out] Pointer to a orient_t structure that will hold the orientation data.
rorient	[out] Pointer to a orient_t structure that will hold the non-smoothed orientation data.
smooth	If smoothing should be performed on the angles calculated. 1 to enable, 0 to disable.
accel_xshift	[in] Per-axis WIIUSE_ACCEL_10BIT decode shift; see dynamics.h.
accel_yshift	[in] Per-axis WIIUSE_ACCEL_10BIT decode shift; see dynamics.h.
accel_zshift	[in] Per-axis WIIUSE_ACCEL_10BIT decode shift; see dynamics.h.

Given the raw acceleration data from the accelerometer struct, calculate the orientation of the device and set it in the orient parameter.

wiiuse_scale_calibration()

struct vec3i_t wiiuse_scale_calibration	(	const struct vec3b_t *	cal,
		const struct vec3b_t *	cal_lsb,
		int	accel_xshift,
		int	accel_yshift,
		int	accel_zshift
	)

Scale an 8-bit calibration point up to the raw accel value's scale, per axis, filling in any real extra-precision bits decoded for it along the way.

accel_xshift/yshift/zshift is 0 (a no-op) unless WIIUSE_ACCEL_10BIT is defined, so this always matches the scale handle_wm_accel()/ nunchuk_event() decoded the raw value at - see dynamics.h.

cal_lsb holds real extra-precision bits decoded from EEPROM (Wii Remote only); it is 0 elsewhere, so ORing it in is then a no-op.