add simple LED blinking programm

src/led-controller.c

@@ -0,0 +1,29 @@
+#include <stdint.h> /* Standard Integer Types */
+#include <stdio.h> /* Standard IO facilities */
+#include <stdlib.h> /* General utilities */
+#include <string.h> /* Strings */
+#include <avr/io.h> /* AVR device-specific IO definitions */
+#include <util/delay.h> /* Convenience functions for busy-wait delay loops */
+
+#define LED PD6 /* LED port */
+
+
+static void ioinit(void)
+{
+	DDRD = (1<<LED); /* set LED pin as output */
+}
+
+int main(void)
+{
+	ioinit(); /* initialize IOs */
+
+	uint8_t i;
+
+	/* blink LED */
+	for (i = 0; i < 100; i++) {
+		PIND |= (1<<LED); /* toggle LED */
+		_delay_ms(1000);
+	}
+
+	return 0;
+}