src/events.c File Reference

Handles wiimote events. More...

#include
#include
#include
#include
#include
#include
#include
#include "definitions.h"
#include "io.h"
#include "wiiuse_internal.h"
#include "dynamics.h"
#include "ir.h"
#include "nunchuk.h"
#include "classic.h"
#include "guitar_hero_3.h"
#include "events.h"

Include dependency graph for events.c:

Defines
#define	STATE_CHANGED(a, b)   if (a != b) return 1
#define	CROSS_THRESH(last, now, thresh)
#define	CROSS_THRESH_XYZ(last, now, thresh)
Functions
static void	idle_cycle (struct wiimote_t *wm)
	Called on a cycle where no significant change occurs.
static void	clear_dirty_reads (struct wiimote_t *wm)
	Clear out all old 'dirty' read requests.
static void	propagate_event (struct wiimote_t *wm, byte event, byte *msg)
	Analyze the event that occured on a wiimote.
static void	event_data_read (struct wiimote_t *wm, byte *msg)
	Received a data packet from a read request.
static void	event_status (struct wiimote_t *wm, byte *msg)
	Read the controller status.
static void	handle_expansion (struct wiimote_t *wm, byte *msg)
	Handle data from the expansion.
static void	save_state (struct wiimote_t *wm)
	Save important state data.
static int	state_changed (struct wiimote_t *wm)
	Determine if the current state differs significantly from the previous.
int	wiiuse_poll (struct wiimote_t **wm, int wiimotes)
	Poll the wiimotes for any events.
void	wiiuse_pressed_buttons (struct wiimote_t *wm, byte *msg)
	Find what buttons are pressed.
void	handshake_expansion (struct wiimote_t *wm, byte *data, unsigned short len)
	Handle the handshake data from the expansion device.
void	disable_expansion (struct wiimote_t *wm)
	Disable the expansion device if it was enabled.

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Detailed Description

Handles wiimote events.

The file includes functions that handle the events that are sent from the wiimote to us.

---

Define Documentation

#define CROSS_THRESH	(	last,
		now,
		thresh		)

Value:

do {                                                            \
                    if (WIIMOTE_IS_FLAG_SET(wm, WIIUSE_ORIENT_THRESH)) {        \
                        if ((diff_f(last.roll, now.roll) >= thresh) ||          \
                            (diff_f(last.pitch, now.pitch) >= thresh) ||        \
                            (diff_f(last.yaw, now.yaw) >= thresh))              \
                        {                                                       \
                            last = now;                                         \
                            return 1;                                           \
                        }                                                       \
                    } else {                                                    \
                        if (last.roll != now.roll)      return 1;               \
                        if (last.pitch != now.pitch)    return 1;               \
                        if (last.yaw != now.yaw)        return 1;               \
                    }                                                           \
                } while (0)

#define CROSS_THRESH_XYZ	(	last,
		now,
		thresh		)

Value:

do {                                                            \
                    if (WIIMOTE_IS_FLAG_SET(wm, WIIUSE_ORIENT_THRESH)) {        \
                        if ((diff_f(last.x, now.x) >= thresh) ||                \
                            (diff_f(last.y, now.y) >= thresh) ||                \
                            (diff_f(last.z, now.z) >= thresh))                  \
                        {                                                       \
                            last = now;                                         \
                            return 1;                                           \
                        }                                                       \
                    } else {                                                    \
                        if (last.x != now.x)        return 1;                   \
                        if (last.y != now.y)        return 1;                   \
                        if (last.z != now.z)        return 1;                   \
                    }                                                           \
                } while (0)

---

Function Documentation

static void clear_dirty_reads

(

struct wiimote_t *

wm

)

[static]

Clear out all old 'dirty' read requests.

Parameters:

wm

Pointer to a wiimote_t structure.

void disable_expansion

(

struct wiimote_t *

wm

)

Disable the expansion device if it was enabled.

Parameters:

	wm	A pointer to a wiimote_t structure.
	data	The data read in from the device.
	len	The length of the data block, in bytes.

If the data is NULL then this function will try to start a handshake with the expansion.

static void event_data_read	(	struct wiimote_t *	wm,
		byte *	msg
	)			[static]

Received a data packet from a read request.

Parameters:

	wm	Pointer to a wiimote_t structure.
	msg	The message specified in the event packet.

Data from the wiimote comes in packets. If the requested data segment size is bigger than one packet can hold then several packets will be received. These packets are first reassembled into one, then the registered callback function that handles data reads is invoked.

static void event_status	(	struct wiimote_t *	wm,
		byte *	msg
	)			[static]

Read the controller status.

Parameters:

	wm	Pointer to a wiimote_t structure.
	msg	The message specified in the event packet.

Read the controller status and execute the registered status callback.

static void handle_expansion	(	struct wiimote_t *	wm,
		byte *	msg
	)			[static]

Handle data from the expansion.

Parameters:

	wm	A pointer to a wiimote_t structure.
	msg	The message specified in the event packet for the expansion.

void handshake_expansion	(	struct wiimote_t *	wm,
		byte *	data,
		unsigned short	len
	)

Handle the handshake data from the expansion device.

Parameters:

	wm	A pointer to a wiimote_t structure.
	data	The data read in from the device.
	len	The length of the data block, in bytes.

Tries to determine what kind of expansion was attached and invoke the correct handshake function.

If the data is NULL then this function will try to start a handshake with the expansion.

static void idle_cycle

(

struct wiimote_t *

wm

)

[static]

Called on a cycle where no significant change occurs.

Parameters:

wm

Pointer to a wiimote_t structure.

static void propagate_event	(	struct wiimote_t *	wm,
		byte	event,
		byte *	msg
	)			[static]

Analyze the event that occured on a wiimote.

Parameters:

	wm	An array of pointers to wiimote_t structures.
	event	The event that occured.
	msg	The message specified in the event packet.

Pass the event to the registered event callback.

static void save_state

(

struct wiimote_t *

wm

)

[static]

Save important state data.

Parameters:

wm

A pointer to a wiimote_t structure.

static int state_changed

(

struct wiimote_t *

wm

)

[static]

Determine if the current state differs significantly from the previous.

Parameters:

wm

A pointer to a wiimote_t structure.

Returns:

1 if a significant change occured, 0 if not.

int wiiuse_poll	(	struct wiimote_t **	wm,
		int	wiimotes
	)

Poll the wiimotes for any events.

Parameters:

	wm	An array of pointers to wiimote_t structures.
	wiimotes	The number of wiimote_t structures in the wm array.

Returns:

Returns number of wiimotes that an event has occured on.

It is necessary to poll the wiimote devices for events that occur. If an event occurs on a particular wiimote, the event variable will be set.

void wiiuse_pressed_buttons	(	struct wiimote_t *	wm,
		byte *	msg
	)

Find what buttons are pressed.

Parameters:

	wm	Pointer to a wiimote_t structure.
	msg	The message specified in the event packet.

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