update

app/utils.h

@@ -5,4 +5,22 @@ int hex2bytes(const char *str, uint8_t *bytes, int32_t length);
 void bytes2hex(const uint8_t *bytes, int32_t length, char *str, int32_t strLength);
 int Rssi2Quality(sint8 rssi);
 
+class Debounce
+{
+	static constexpr uint8_t UPPER = 0b10000000;
+	static constexpr uint8_t LOWER = 0b01111111;
+public:
+	Debounce();
+	Debounce(bool signal);
+	void init(bool signal);
+	/* Return value:
+	 *  0: no change
+	 * -1: LOW/False (falling edge)
+	 *  1: HIGH/True (rising edge)
+	 */
+	int8_t debounce(bool signal);
+private:
+	uint8_t state;
+};
+
 #endif