From 56a903e91b589023b68e3a4961891e4945fca618 Mon Sep 17 00:00:00 2001
From: Thomas White <taw27@cam.ac.uk>
Date: Sun, 23 Nov 2008 21:00:45 +0000
Subject: Make it easier to add other accelerometer types

---
 src/accelerometers.c | 108 +++++++++++++++++++++++----------------------------
 src/types.h          |  29 +++++++-------
 2 files changed, 62 insertions(+), 75 deletions(-)

diff --git a/src/accelerometers.c b/src/accelerometers.c
index 464134b..3440fae 100644
--- a/src/accelerometers.c
+++ b/src/accelerometers.c
@@ -51,70 +51,40 @@ 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->fh = fopen("/dev/input/event3", "rb");
+	if ( accel->fh != NULL ) {
+		accel->type = ACCEL_FREERUNNER;
+		printf("Neo Freerunner detected\n");
+		return accel;
+	}
 	
-	accel->fh1 = fopen("/dev/input/event2", "rb");
-	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;
+	/* Try other types here */
 	
+	fprintf(stderr, "Couldn't determine accelerometer type\n");
 	return accel;
 
 }
 
-void accelerometer_update(AccelHandle *accel) {
+void accelerometer_update_freerunner(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 ) {
+	if ( accel->fh != NULL ) {
 	
 		struct input_event ev;
 		size_t rval;
 		
-		rval = fread(&ev, sizeof(struct input_event), 1, accel->fh2);
+		rval = fread(&ev, sizeof(struct input_event), 1, accel->fh);
 		if ( rval != 1 ) {
 			fprintf(stderr, "Couldn't read accelerometer data");
 			return;
@@ -122,21 +92,21 @@ void accelerometer_update(AccelHandle *accel) {
 	
 		if ( ev.type == EV_REL ) {
 			if ( ev.code == REL_X ) {
-				accel->lbx = ev.value;
+				accel->lx = ev.value;
 			}
 			if ( ev.code == REL_Y ) {
-				accel->lby = ev.value;
+				accel->ly = ev.value;
 			}
 			if ( ev.code == REL_Z ) {
-				accel->lbz = ev.value;
+				accel->lz = ev.value;
 			}
 		}
 	
 		if ( ev.type == EV_SYN ) {
 			if ( ev.code == SYN_REPORT ) {
-				accel->bx = accel->lbx;
-				accel->by = accel->lby;
-				accel->bz = accel->lbz;
+				accel->x = accel->lx;
+				accel->y = accel->ly;
+				accel->z = accel->lz;
 			}
 		}
 	}
@@ -144,6 +114,21 @@ void accelerometer_update(AccelHandle *accel) {
 
 }
 
+void accelerometer_update(AccelHandle *accel) {
+
+	switch ( accel->type ) {
+		case ACCEL_UNKNOWN : {
+			return;
+		}
+		case ACCEL_FREERUNNER : {
+			accelerometer_update_freerunner(accel);
+			break;
+		}
+		/* Add other types here */
+	}
+
+}
+
 /* The accelerometer work thread */
 static void *accel_work(void *data) {
 
@@ -157,13 +142,16 @@ static void *accel_work(void *data) {
 	
 		accelerometer_update(accel);
 		
-		if ( accel->lval > 1000 ) pos = 1000;
-		if ( (accel->lval < -1000) && (pos == 1000) ) {
-			pos = 0;
+		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();
diff --git a/src/types.h b/src/types.h
index 7837ff2..2ec6aac 100644
--- a/src/types.h
+++ b/src/types.h
@@ -30,26 +30,25 @@
 #include <stdint.h>
 #include <SDL.h>
 
+typedef enum {
+	ACCEL_UNKNOWN,
+	ACCEL_FREERUNNER,	/* Openmoko Neo Freerunner */
+} AccelType;
+
 typedef struct {
 
-	FILE		*fh1;
-	FILE		*fh2;
+	FILE		*fh;
 	
-	int		ax;
-	int		ay;
-	int		az;
-	int		bx;
-	int		by;
-	int		bz;
+	AccelType	type;
 	
-	int		lval;		/* The "mooing" contribution */
+	int		x;
+	int		y;
+	int		z;
 	
-	int		lax;
-	int		lay;
-	int		laz;
-	int		lbx;
-	int		lby;
-	int		lbz;
+	/* Temporary values for use during reading */
+	int		lx;
+	int		ly;
+	int		lz;
 
 } AccelHandle;
 
-- 
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