#include <stdio.h>
#include "pico/stdlib.h"
#define led 14

int g_timer_0 = 0;
bool status;
bool timer_0_callback(repeating_timer_t *rt);

int main() {
  stdio_init_all();
  gpio_init(led);
  gpio_set_dir(led,GPIO_OUT);
  int timer_0_hz = 1;
  repeating_timer_t timer_0;
  if (!add_repeating_timer_us(1000000 / timer_0_hz, timer_0_callback, NULL, &timer_0)){
    printf("failed to add timer\n");
  }
  status = 0;
  gpio_put (led,status);
  while (true) {
    sleep_ms(50);
  }
}

bool timer_0_callback(repeating_timer_t *rt){
  g_timer_0 = 0;
  status = !status;
  gpio_put (led, status);
  return true;
}