Initial commit.

1 files changed, 25 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..aed9465
--- /dev/null
+++ b/main.c
@@ -0,0 +1,25 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+int main(void)
+{
+	DDRB |= (1 << DDB5);
+
+	TCCR1A = 0;
+	TCNT1 = 65535 - (F_CPU / 1024);
+	TCCR1B = (1 << CS10) | (1 << CS12);
+	TIMSK1 = (1 << TOIE1);
+
+	sei();
+
+	for (;;)
+		;
+
+	return 0;
+}
+
+ISR(TIMER1_OVF_vect)
+{
+	PORTB ^= (1 << 5);
+	TCNT1 = 65535 - (F_CPU / 1024);
+}