source: code/branches/wiimote/src/external/wiicpp/wiic/io.c @ 9960

/*
 *    io.c
 *
 *        This file is part of WiiC, written by:
 *              Gabriele Randelli
 *              Email: randelli@dis.uniroma1.it
 *
 *    Copyright 2010
 *              
 *        This file is based on Wiiuse, written By:
 *              Michael Laforest        < para >
 *              Email: < thepara (--AT--) g m a i l [--DOT--] com >
 *
 *        Copyright 2006-2007
 *
 *    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 Handles device I/O (non-OS specific).
 */

#include <stdio.h>
#include <stdlib.h>

#include "definitions.h"
#include "wiic_internal.h"
#include "io.h"


 /**
 *      @brief Get initialization data from the wiimote.
 *
 *      @param wm               Pointer to a wiimote_t structure.
 *      @param data             unused
 *      @param len              unused
 *
 *      When first called for a wiimote_t structure, a request
 *      is sent to the wiimote for initialization information.
 *      This includes factory set accelerometer data.
 *      The handshake will be concluded when the wiimote responds
 *      with this data.
 */
void wiic_handshake(struct wiimote_t* wm, byte* data, unsigned short len) {
        if (!wm)        return;

        switch (wm->handshake_state) {
                case 0:
                {
                        /* send request to wiimote for accelerometer calibration */
                        byte* buf;

                        WIIMOTE_ENABLE_STATE(wm, WIIMOTE_STATE_HANDSHAKE);
                        wiic_set_leds(wm, WIIMOTE_LED_NONE);

                        buf = (byte*)malloc(sizeof(byte) * 8);
                        wiic_read_data_cb(wm, wiic_handshake, buf, WM_MEM_OFFSET_CALIBRATION, 7);
                        wm->handshake_state++;

                        wiic_set_leds(wm, WIIMOTE_LED_NONE);

                        break;
                }
                case 1:
                {
                        struct read_req_t* req = wm->read_req;
                        struct accel_t* accel = &wm->accel_calib;

                        /* received read data */
                        accel->cal_zero.x = req->buf[0];
                        accel->cal_zero.y = req->buf[1];
                        accel->cal_zero.z = req->buf[2];

                        accel->cal_g.x = req->buf[4] - accel->cal_zero.x;
                        accel->cal_g.y = req->buf[5] - accel->cal_zero.y;
                        accel->cal_g.z = req->buf[6] - accel->cal_zero.z;

                        /* done with the buffer */
                        free(req->buf);

                        /* handshake is done */
                        WIIC_DEBUG("Handshake finished. Calibration: Idle: X=%x Y=%x Z=%x\t+1g: X=%x Y=%x Z=%x",
                                        accel->cal_zero.x, accel->cal_zero.y, accel->cal_zero.z,
                                        accel->cal_g.x, accel->cal_g.y, accel->cal_g.z);


                        /* request the status of the wiimote to see if there is an expansion */
                        wiic_status(wm);

                        WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_HANDSHAKE);
                        WIIMOTE_ENABLE_STATE(wm, WIIMOTE_STATE_HANDSHAKE_COMPLETE);
                        wm->handshake_state++;

                        /* now enable IR if it was set before the handshake completed */
                        if (WIIMOTE_IS_SET(wm, WIIMOTE_STATE_IR)) {
                                WIIC_DEBUG("Handshake finished, enabling IR.");
                                WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_IR);
                                wiic_set_ir(wm, 1);
                        }

                        break;
                }
                default:
                {
                        break;
                }
        }
}