diff --git a/CHANGELOG b/CHANGELOG
index b7b02a9..0844445 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -15,7 +15,7 @@ http://sourceforge.net/projects/wiiuse/
 v0.15 -- ???
 ---------------------------
 	Added:
-		-
+		- Callback API with constant-size WiimoteState_t. Thanks to bhartsho.
 	Fixed:
 		-
 	Changed:
diff --git a/src/events.c b/src/events.c
index 1889ea4..1d8319d 100644
--- a/src/events.c
+++ b/src/events.c
@@ -192,6 +192,42 @@ int wiiuse_poll(struct wiimote_t** wm, int wiimotes) {
 }
 
 
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+/* Harts API */
+
+int wiiuse_update(struct wiimote_t** wiimotes, int nwiimotes, wiiuse_update_cb callback) {
+	if (wiiuse_poll(wiimotes, nwiimotes)) {
+		static struct WiimoteState_t s;
+		int i = 0;
+		for (; i < nwiimotes; ++i) {
+			switch (wiimotes[i]->event) {
+				case WIIUSE_NONE:
+					break;
+				default:
+					/* this could be:  WIIUSE_EVENT, WIIUSE_STATUS, WIIUSE_CONNECT, etc.. */
+					s.uid = wiimotes[i]->unid;
+					s.leds = wiimotes[i]->leds;
+					s.battery_level = wiimotes[i]->battery_level;
+					s.accel = wiimotes[i]->accel;
+					s.orient = wiimotes[i]->orient;
+					s.gforce = wiimotes[i]->gforce;
+					s.ir = wiimotes[i]->ir;
+					s.buttons = wiimotes[i]->btns;
+					s.buttons_held = wiimotes[i]->btns_held;
+					s.buttons_released = wiimotes[i]->btns_released;
+					s.event = wiimotes[i]->event;
+					s.state = wiimotes[i]->state;
+					s.expansion = wiimotes[i]->exp;
+					callback( &s );
+					break;
+			}
+		}
+		return 1;
+	}
+	return 0;
+}
+
+
 /**
  *	@brief Called on a cycle where no significant change occurs.
  *
diff --git a/src/wiiuse.h b/src/wiiuse.h
index 68630f6..da1f6e0 100644
--- a/src/wiiuse.h
+++ b/src/wiiuse.h
@@ -773,6 +773,29 @@ WIIUSE_EXPORT extern void wiiuse_set_nunchuk_accel_threshold(struct wiimote_t* w
 /* this function not currently implemented... */
 WIIUSE_EXPORT extern void wiiuse_set_wii_board_calib(struct wiimote_t *wm);
 
+/* wiiuse.c harts API */
+typedef struct WiimoteState_t {
+	WCONST int uid;
+	WCONST byte leds;
+	WCONST float battery_level;
+	WCONST struct vec3b_t accel;
+	WCONST struct orient_t orient;	
+	WCONST struct gforce_t gforce;
+	WCONST struct ir_t ir;
+	WCONST uint16_t buttons;
+	WCONST uint16_t buttons_held;
+	WCONST uint16_t buttons_released;
+	WCONST WIIUSE_EVENT_TYPE event;
+	WCONST int state;
+	WCONST struct expansion_t expansion;
+} WiimoteState;
+
+typedef void (*wiiuse_update_cb)(struct WiimoteState_t* wm);
+
+WIIUSE_EXPORT extern int wiiuse_update(struct wiimote_t** wm, int wiimotes, wiiuse_update_cb callback); 
+
+/* end harts API */
+
 #ifdef __cplusplus
 }
 #endif