#include "pico/stdlib.h"
#include "hardware/pwm.h"

#define LED_PIN 22 // Change to GPIO where the LED is connected

int main() {
    // Initialize the GPIO
    gpio_set_function(LED_PIN, GPIO_FUNC_PWM); // Set GPIO to PWM function

    // Get the PWM slice number for the specified GPIO
    uint slice_num = pwm_gpio_to_slice_num(LED_PIN);

    // Set the PWM frequency
    pwm_set_wrap(slice_num, 255); // Set TOP value for 8-bit resolution (0-255)
    pwm_set_clkdiv(slice_num, 4.0f); // Set the clock divider to control frequency

    // Enable PWM on the specified slice
    pwm_set_enabled(slice_num, true);

    while (true) {
        // Gradually increase brightness
        for (int i = 0; i <= 255; i++) {
            pwm_set_gpio_level(LED_PIN, i); // Set PWM duty cycle
            sleep_ms(10); // Wait to see the brightness change
        }

        // Gradually decrease brightness
        for (int i = 255; i >= 0; i--) {
            pwm_set_gpio_level(LED_PIN, i); // Set PWM duty cycle
            sleep_ms(10); // Wait to see the brightness change
        }
    }

    return 0;
}