concertina

blink.c

 1#include <stdbool.h>
 2#include <stdint.h>
 3#include <avr/io.h>
 4#include <avr/interrupt.h>
 5
 6// CPU frequency in Hertz
 7#define F_CPU (1 * 1000000UL)
 8
 9void init(void) {
10  DDRB = 0xff; // All port B pins are outputs
11}
12
13void loop(void) {
14  static uint32_t count = 0;
15
16  if (count++ == 20000) {
17    PORTB ^= 0x01; // Toggle pin 0
18    count = 0;
19  }
20}
21
22int main(void) {
23	init();
24
25	for (;;) {
26		loop();
27	}
28
29	return 0;
30}