-#define KEYEQ(keya, keyb) (keya.raw == keyb.raw)
-#define IS_NOEVENT(event) (event.time == 0)
-#define NOEVENT (keyevent_t) { \
- .key = (keypos_t){ .row = 255, .col = 255 }, \
- .pressed = false, \
- .time = 0, \
+/* equivalent test of keypos_t */
+#define KEYEQ(keya, keyb) ((keya).row == (keyb).row && (keya).col == (keyb).col)
+
+/* Rules for No Event:
+ * 1) (time == 0) to handle (keyevent_t){} as empty event
+ * 2) Matrix(255, 255) to make TICK event available
+ */
+static inline bool IS_NOEVENT(keyevent_t event) { return event.time == 0 || (event.key.row == 255 && event.key.col == 255); }
+static inline bool IS_PRESSED(keyevent_t event) { return (!IS_NOEVENT(event) && event.pressed); }
+static inline bool IS_RELEASED(keyevent_t event) { return (!IS_NOEVENT(event) && !event.pressed); }
+
+/* Tick event */
+#define TICK (keyevent_t){ \
+ .key = (keypos_t){ .row = 255, .col = 255 }, \
+ .pressed = false, \
+ .time = (timer_read() | 1) \