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/*
* accelerometers.c
*
* Accelerometer stuff
*
* (c) 2008 Thomas White <taw27@srcf.ucam.org>
*
* This file is part of OpenMooCow - accelerometer moobox simulator
*
* OpenMooCow 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.
*
* OpenMooCow 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 OpenMooCow. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "types.h"
#include "audio.h"
struct input_event {
struct timeval time;
uint16_t type;
uint16_t code;
int32_t value;
};
#define EV_SYN (0x00)
#define EV_REL (0x02)
#define SYN_REPORT (0x00)
#define REL_X (0x00)
#define REL_Y (0x01)
#define REL_Z (0x02)
AccelHandle *accelerometer_open() {
AccelHandle *accel;
/* Initialise accelerometer data structure */
accel = malloc(sizeof(AccelHandle));
if ( accel == NULL ) return NULL;
accel->x = 0;
accel->y = 0;
accel->z = 0;
accel->lx = 0;
accel->ly = 0;
accel->lz = 0;
accel->type = ACCEL_UNKNOWN;
/* Determine accelerometer type */
accel->fd = open("/dev/input/event3", O_RDONLY, O_NONBLOCK);
if ( accel->fd != -1 ) {
accel->type = ACCEL_FREERUNNER;
printf("Neo Freerunner detected\n");
return accel;
}
/* Try other types here */
fprintf(stderr, "Couldn't determine accelerometer type\n");
return accel;
}
void accelerometer_update_freerunner(AccelHandle *accel) {
struct input_event ev;
size_t rval;
rval = read(accel->fd, &ev, sizeof(ev));
if ( rval != sizeof(ev) ) {
fprintf(stderr, "Couldn't read accelerometer data");
return;
}
if ( ev.type == EV_REL ) {
if ( ev.code == REL_X ) {
accel->lx = ev.value;
}
if ( ev.code == REL_Y ) {
accel->ly = ev.value;
}
if ( ev.code == REL_Z ) {
accel->lz = ev.value;
}
}
if ( ev.type == EV_SYN ) {
if ( ev.code == SYN_REPORT ) {
accel->x = accel->lx;
accel->y = accel->ly;
accel->z = accel->lz;
}
}
}
void accelerometer_update(AccelHandle *accel) {
switch ( accel->type ) {
case ACCEL_UNKNOWN : {
return;
}
case ACCEL_FREERUNNER : {
accelerometer_update_freerunner(accel);
break;
}
/* Add other types here. You simply need to provide the "y"
* component of acceleration in milli-g in the relevant
* structure. */
}
}
/* The accelerometer work thread */
static void *accel_work(void *data) {
AccelHandle *accel;
int *finished = data;
int pos = 0;
accel = accelerometer_open();
audio_setup();
while ( !(*finished) ) {
accelerometer_update(accel);
if ( (accel->y < -500) && (pos > -1000) ) {
pos = -1000;
audio_trigger_moo();
} else if ( (accel->y > 500) && (pos < 1000) ) {
pos = 1000;
audio_trigger_moo();
}
usleep(25000);
}
audio_shutdown();
return NULL;
}
GThread *accelerometer_start(int *finished) {
return g_thread_create(accel_work, finished, TRUE, NULL);
}
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