#include <stdio.h>
#include "pico/stdlib.h"

const int LED_PIN_R = 4;

volatile int cnt = 0;

bool timer_b_callback(repeating_timer_t* rt) {
    printf("timer %d\n", cnt++);
    return true; // keep repeating
}

int main() {
    stdio_init_all();

    gpio_init(LED_PIN_R);
    gpio_set_dir(LED_PIN_R, GPIO_OUT);

    repeating_timer_t timer_b;

    add_repeating_timer_ms(100, timer_b_callback, NULL, &timer_b);
    sleep_ms(1000);
    cancel_repeating_timer(&timer_b);
    add_repeating_timer_ms(300, timer_b_callback, NULL, &timer_b);
    printf("Canceled timer \n");

    while (true) {
      printf("Canceled timer\n");
        cancel_repeating_timer(&timer_b);
        add_repeating_timer_ms(300, timer_b_callback, NULL, &timer_b);
                 sleep_ms(1000);

    }
}