+ PRR1 &= ~_BV(PRTIM3);
+ 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, INT6: falling edge */
+ EICRB = (EICRB & ~((0b11 << ISC50) | (0b11 << ISC60))) |
+ (0b10 << ISC50) | (0b10 << ISC60);
+ /* Reset pending ints */
+ EIFR |= _BV(INTF5) | _BV(INTF6);
+ /* Enable INT5, and INT6 */
+ EIMSK |= _BV(INT5) | _BV(INT6);
+}
+
+static
+int reset_reason_is_power_on(void)
+{
+ return (mcusr & _BV(PORF)) != 0;
+}
+
+static
+void setup_system_time(void)
+{
+ struct tm rtc_time;