1 files changed, 57 insertions, 0 deletions
diff --git a/sleep/main.c b/sleep/main.c
new file mode 100644
index 0000000..007dc18
--- /dev/null
+++ b/sleep/main.c
@@ -0,0 +1,57 @@
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+#include <util/delay.h>
+
+#include "uart.h"
+
+#define LOCK_PIN      PD2
+#define UNLOCK_PIN    PD3
+
+static inline void init_btns(void)
+{
+	DDRD &= ~((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
+	PORTD |= ((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
+	EICRA = 0b00000000;
+	EIMSK = (1 << INT0) | (1 << INT1);
+}
+
+int main(void)
+{
+	init_btns();
+	uart_init();	
+
+	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+	sei();
+
+	for (;;) {
+		uart_write_line("Going to sleep");
+		sleep_enable();	
+		sleep_bod_disable();
+		sleep_cpu();
+		sleep_disable();
+		uart_write_line("It's alive!");
+		_delay_ms(1500);
+	}
+	return 0;
+}
+
+static inline int is_btn_pressed(uint8_t pin, uint8_t btn)
+{
+	if (!((pin >> btn) & 0x01)) {
+		_delay_ms(100);
+		return !((pin >> btn) & 0x01);
+	}
+	return 0;
+}
+
+ISR(INT0_vect)
+{
+	if (is_btn_pressed(PIND, LOCK_PIN))
+		uart_write_line("Locked");
+}
+
+ISR(INT1_vect)
+{
+	if (is_btn_pressed(PIND, UNLOCK_PIN))
+		uart_write_line("Unlocked");
+}