From ec010b19cac1d5aea5393a687a91431f2e541101 Mon Sep 17 00:00:00 2001
From: Thomas White <taw27@cam.ac.uk>
Date: Tue, 14 Oct 2008 23:20:29 +0100
Subject: Initial import

---
 src/accelerometers.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/accelerometers.c

(limited to 'src/accelerometers.c')

diff --git a/src/accelerometers.c b/src/accelerometers.c
new file mode 100644
index 0000000..7d8b0f2
--- /dev/null
+++ b/src/accelerometers.c
@@ -0,0 +1,145 @@
+/*
+ * 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 "types.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;
+	
+	accel = malloc(sizeof(AccelHandle));
+	if ( accel == NULL ) return NULL;
+	
+	accel->fh1 = fopen("/dev/input/event2", "rb");
+	accel->fh2 = NULL;
+//	accel->fh2 = fopen("/dev/input/event3", "rb");
+	accel->ax = 0;
+	accel->ay = 0;
+	accel->az = 0;
+	accel->bx = 0;
+	accel->by = 0;
+	accel->bz = 0;
+	
+	return accel;
+
+}
+
+void accelerometer_update(AccelHandle *accel) {
+
+	if ( accel->fh1 != NULL ) {
+	
+		int i;
+		
+		for ( i=1; i<=4; i++ ) {
+		
+			struct input_event ev;
+			size_t rval;
+		
+			rval = fread(&ev, sizeof(struct input_event), 1, accel->fh1);
+			if ( rval != 1 ) {
+				fprintf(stderr, "Couldn't read accelerometer data");
+				return;
+			}
+	
+			if ( ev.type == EV_REL ) {
+				if ( ev.code == REL_X ) {
+					accel->lax = ev.value;
+				}
+				if ( ev.code == REL_Y ) {
+					accel->lay = ev.value;
+				}
+				if ( ev.code == REL_Z ) {
+					accel->laz = ev.value;
+				}
+			}
+	
+			if ( ev.type == EV_SYN ) {
+				if ( ev.code == SYN_REPORT ) {
+					accel->ax = accel->lax;
+					accel->ay = accel->lay;
+					accel->az = accel->laz;
+					accel->lval = accel->ax + accel->ay;
+				}
+			}
+		
+		}
+		
+	}
+	
+	if ( accel->fh2 != NULL ) {
+	
+		struct input_event ev;
+		size_t rval;
+		
+		rval = fread(&ev, sizeof(struct input_event), 1, accel->fh2);
+		if ( rval != 1 ) {
+			fprintf(stderr, "Couldn't read accelerometer data");
+			return;
+		}
+	
+		if ( ev.type == EV_REL ) {
+			if ( ev.code == REL_X ) {
+				accel->lbx = ev.value;
+			}
+			if ( ev.code == REL_Y ) {
+				accel->lby = ev.value;
+			}
+			if ( ev.code == REL_Z ) {
+				accel->lbz = ev.value;
+			}
+		}
+	
+		if ( ev.type == EV_SYN ) {
+			if ( ev.code == SYN_REPORT ) {
+				accel->bx = accel->lbx;
+				accel->by = accel->lby;
+				accel->bz = accel->lbz;
+			}
+		}
+	}
+
+
+}
+
-- 
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