trigger LED on timer

src/timer.rs

@@ -0,0 +1,12 @@
+use arduino_hal::pac::TC0;
+
+pub fn segment_timer_init(tc0: TC0, counts: u8) {
+    // Use CTC mode: reset counter when matches compare value
+    tc0.tccr0a.write(|w| w.wgm0().ctc());
+    // Set the compare value
+    tc0.ocr0a.write(|w| w.bits(counts));
+    // Slow down the timer (CLK / prescale)
+    tc0.tccr0b.write(|w| w.cs0().prescale_1024());
+    // Raise interrupt on reset
+    tc0.timsk0.write(|w| w.ocie0a().set_bit());
+}