dolphin/Externals/WiiUseSrc/Src/nunchuk.cpp

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/*
* wiiuse
*
* Written By:
* Michael Laforest < para >
* Email: < thepara (--AT--) g m a i l [--DOT--] com >
*
* Copyright 2006-2007
*
* This file is part of wiiuse.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* $Header$
*
*/
/**
* @file
* @brief Nunchuk expansion device.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "definitions.h"
#include "wiiuse_internal.h"
#include "dynamics.h"
#include "events.h"
#include "nunchuk.h"
static void nunchuk_pressed_buttons(struct nunchuk_t* nc, byte now);
/**
* @brief Handle the handshake data from the nunchuk.
*
* @param nc A pointer to a nunchuk_t structure.
* @param data The data read in from the device.
* @param len The length of the data block, in bytes.
*
* @return Returns 1 if handshake was successful, 0 if not.
*/
int nunchuk_handshake(struct wiimote_t* wm, struct nunchuk_t* nc, byte* data, unsigned short len) {
int i;
int offset = 0;
nc->btns = 0;
nc->btns_held = 0;
nc->btns_released = 0;
/* set the smoothing to the same as the wiimote */
nc->flags = &wm->flags;
nc->accel_calib.st_alpha = wm->accel_calib.st_alpha;
/* decrypt data */
for (i = 0; i < len; ++i)
data[i] = (data[i] ^ 0x17) + 0x17;
if (data[offset] == 0xFF) {
/*
* Sometimes the data returned here is not correct.
* This might happen because the wiimote is lagging
* behind our initialization sequence.
* To fix this just request the handshake again.
*
* Other times it's just the first 16 bytes are 0xFF,
* but since the next 16 bytes are the same, just use
* those.
*/
if (data[offset + 16] == 0xFF) {
/* get the calibration data */
byte* handshake_buf = (byte *)malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
WIIUSE_DEBUG("Nunchuk handshake appears invalid, trying again.");
wiiuse_read_data_cb(wm, handshake_expansion, handshake_buf, WM_EXP_MEM_CALIBR, EXP_HANDSHAKE_LEN);
return 0;
} else
offset += 16;
}
nc->accel_calib.cal_zero.x = data[offset + 0];
nc->accel_calib.cal_zero.y = data[offset + 1];
nc->accel_calib.cal_zero.z = data[offset + 2];
nc->accel_calib.cal_g.x = data[offset + 4];
nc->accel_calib.cal_g.y = data[offset + 5];
nc->accel_calib.cal_g.z = data[offset + 6];
nc->js.max.x = data[offset + 8];
nc->js.min.x = data[offset + 9];
nc->js.center.x = data[offset + 10];
nc->js.max.y = data[offset + 11];
nc->js.min.y = data[offset + 12];
nc->js.center.y = data[offset + 13];
/* default the thresholds to the same as the wiimote */
nc->orient_threshold = wm->orient_threshold;
nc->accel_threshold = wm->accel_threshold;
/* handshake done */
wm->exp.type = EXP_NUNCHUK;
#ifdef WIN32
wm->timeout = WIIMOTE_DEFAULT_TIMEOUT;
#endif
return 1;
}
/**
* @brief The nunchuk disconnected.
*
* @param nc A pointer to a nunchuk_t structure.
*/
void nunchuk_disconnected(struct nunchuk_t* nc) {
memset(nc, 0, sizeof(struct nunchuk_t));
}
/**
* @brief Handle nunchuk event.
*
* @param nc A pointer to a nunchuk_t structure.
* @param msg The message specified in the event packet.
*/
void nunchuk_event(struct nunchuk_t* nc, byte* msg) {
int i;
/* decrypt data */
for (i = 0; i < 6; ++i)
msg[i] = (msg[i] ^ 0x17) + 0x17;
/* get button states */
nunchuk_pressed_buttons(nc, msg[5]);
/* calculate joystick state */
calc_joystick_state(&nc->js, msg[0], msg[1]);
/* calculate orientation */
nc->accel.x = msg[2];
nc->accel.y = msg[3];
nc->accel.z = msg[4];
calculate_orientation(&nc->accel_calib, &nc->accel, &nc->orient, NUNCHUK_IS_FLAG_SET(nc, WIIUSE_SMOOTHING));
calculate_gforce(&nc->accel_calib, &nc->accel, &nc->gforce);
}
/**
* @brief Find what buttons are pressed.
*
* @param nc Pointer to a nunchuk_t structure.
* @param msg The message byte specified in the event packet.
*/
static void nunchuk_pressed_buttons(struct nunchuk_t* nc, byte now) {
/* message is inverted (0 is active, 1 is inactive) */
now = ~now & NUNCHUK_BUTTON_ALL;
/* pressed now & were pressed, then held */
nc->btns_held = (now & nc->btns);
/* were pressed or were held & not pressed now, then released */
nc->btns_released = ((nc->btns | nc->btns_held) & ~now);
/* buttons pressed now */
nc->btns = now;
}
/**
* @brief Set the orientation event threshold for the nunchuk.
*
* @param wm Pointer to a wiimote_t structure with a nunchuk attached.
* @param threshold The decimal place that should be considered a significant change.
*
* See wiiuse_set_orient_threshold() for details.
*/
void wiiuse_set_nunchuk_orient_threshold(struct wiimote_t* wm, float threshold) {
if (!wm) return;
wm->exp.nunchuk.orient_threshold = threshold;
}
/**
* @brief Set the accelerometer event threshold for the nunchuk.
*
* @param wm Pointer to a wiimote_t structure with a nunchuk attached.
* @param threshold The decimal place that should be considered a significant change.
*
* See wiiuse_set_orient_threshold() for details.
*/
void wiiuse_set_nunchuk_accel_threshold(struct wiimote_t* wm, int threshold) {
if (!wm) return;
wm->exp.nunchuk.accel_threshold = threshold;
}