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

const int PWM_14_PIN = 14;
int main() {
  gpio_set_function(PWM_14_PIN,GPIO_FUNC_PWM);
  uint slice_num = pwm_gpio_to_slice_num(PWM_14_PIN);
  pwm_set_clkdiv(slice_num,125);
  pwm_set_wrap(slice_num,100);
  pwm_set_chan_level(slice_num,PWM_CHAN_A,70);
  pwm_set_enabled(slice_num,true);
  while(1) {
    for(uint8_t index = 0; index < 100; index++) {
      pwm_set_chan_level(slice_num, PWM_CHAN_A, index);
      pwm_set_enabled (slice_num, true);
      sleep_ms(50);
    }
    sleep_ms(500);
    for (int8_t index = 58; index > 0; index --) {
      pwm_set_chan_level(slice_num, PWM_CHAN_A, index);
      pwm_set_enabled (slice_num, true);
      sleep_ms(50);
    }
    sleep_ms(500);
  }
}