+//#define NO_SUSPEND_POWER_DOWN
+
+
+/*
+ * PS/2 Busywait
+ */
+#ifdef PS2_USE_BUSYWAIT
+#define PS2_CLOCK_PORT PORTD
+#define PS2_CLOCK_PIN PIND
+#define PS2_CLOCK_DDR DDRD
+#define PS2_CLOCK_BIT 1
+#define PS2_DATA_PORT PORTD
+#define PS2_DATA_PIN PIND
+#define PS2_DATA_DDR DDRD
+#define PS2_DATA_BIT 0
+#endif
+
+/*
+ * PS/2 Pin interrupt
+ */
+#ifdef PS2_USE_INT
+#if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega32U2__)
+/* uses INT1 for clock line(ATMega32U4) */
+#define PS2_CLOCK_PORT PORTD
+#define PS2_CLOCK_PIN PIND
+#define PS2_CLOCK_DDR DDRD
+#define PS2_CLOCK_BIT 1
+#define PS2_DATA_PORT PORTD
+#define PS2_DATA_PIN PIND
+#define PS2_DATA_DDR DDRD
+#define PS2_DATA_BIT 0
+#define PS2_INT_INIT() do { \
+ EICRA |= ((1<<ISC11) | \
+ (0<<ISC10)); \
+} while (0)
+#define PS2_INT_ON() do { \
+ EIMSK |= (1<<INT1); \
+} while (0)
+#define PS2_INT_OFF() do { \
+ EIMSK &= ~(1<<INT1); \
+} while (0)
+#define PS2_INT_VECT INT1_vect
+
+#elif defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
+/* uses PCINT17(PD1) for clock line. this doesn't work with VUSB */
+#define PS2_CLOCK_PORT PORTD
+#define PS2_CLOCK_PIN PIND
+#define PS2_CLOCK_DDR DDRD
+#define PS2_CLOCK_BIT 1
+#define PS2_DATA_PORT PORTD
+#define PS2_DATA_PIN PIND
+#define PS2_DATA_DDR DDRD
+#define PS2_DATA_BIT 0
+#define PS2_INT_INIT() do { \
+ PCICR |= (1<<PCIE2); \
+} while (0)
+#define PS2_INT_ON() do { \
+ PCMSK2 |= (1<<PCINT17); \
+} while (0)
+#define PS2_INT_OFF() do { \
+ PCMSK2 &= ~(1<<PCINT17); \
+} while (0)
+#define PS2_INT_VECT PCINT2_vect
+#endif
+#endif
+
+/*
+ * PS/2 USART
+ */