#define SERIAL_SOFT_RXD_BIT 2
#define SERIAL_SOFT_RXD_VECT INT2_vect
/* RXD Interupt */
+#ifdef SERIAL_SOFT_LOGIC_NEGATIVE
+/* enable interrupt: INT2(rising edge) */
+#define INTR_TRIG_EDGE ((1<<ISC21)|(1<<ISC20))
+#else
+/* enable interrupt: INT2(falling edge) */
+#define INTR_TRIG_EDGE ((1<<ISC21)|(0<<ISC20))
+#endif
#define SERIAL_SOFT_RXD_INIT() do { \
/* pin configuration: input with pull-up */ \
SERIAL_SOFT_RXD_DDR &= ~(1<<SERIAL_SOFT_RXD_BIT); \
SERIAL_SOFT_RXD_PORT |= (1<<SERIAL_SOFT_RXD_BIT); \
- /* enable interrupt: INT2(rising edge) */ \
- EICRA |= ((1<<ISC21)|(1<<ISC20)); \
+ EICRA |= INTR_TRIG_EDGE; \
EIMSK |= (1<<INT2); \
sei(); \
} while (0)