1 files changed, 10 insertions, 0 deletions
diff --git a/avr/main.c b/avr/main.c
index ba8a672..2955630 100644
--- a/avr/main.c
+++ b/avr/main.c
@@ -61,6 +61,11 @@ void print_reset_reason(void)
 
 #endif
 
+ISR(INT5_vect)
+{
+	Stat |= S_MSG_PENDING;
+}
+
 static
 void setup_avr(void)
 {
@@ -99,6 +104,11 @@ void setup_avr(void)
 	OCR3A = F_CPU / 1000 - 1;	/* Timer3: 1000Hz interval (OC3A) */
 	TCCR3B = (0b01<<WGM32)|(0b001<<CS30); /* CTC Mode, Prescaler 1 */
 	TIMSK3 = _BV(OCIE3A);		/* Enable TC2.oca interrupt */
+
+	/* INT5 falling edge */
+	EICRB = (EICRB & ~(0b11 << ISC50)) | 0b10 << ISC50;
+	/* Enable INT5 */
+	EIMSK |= _BV(INT5);
 }
 
 static