Add simple LED driver

blink.c

@@ -0,0 +1,11 @@
+#include <util/delay.h>
+#include "drivers/led.h"
+
+int main(void) {
+	while(1) {
+		led(1);
+		_delay_ms(500);
+		led(0);
+		_delay_ms(500);
+	}
+}

drivers/led.c

@@ -0,0 +1,10 @@
+#include "led.h"
+#include <avr/io.h>
+
+void led(uint8_t on) {
+	if (on) {
+		LED_PORT |= (1 << LED_PIN);
+	} else {
+		LED_PORT &= ~(1 << LED_PIN);
+	}
+}

drivers/led.h

@@ -0,0 +1,3 @@
+#include <stdint.h>
+
+void led(uint8_t on);