/**
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

// Output PWM signals on pins 16 and 17

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

int main() {

    const uint gpio_pwm_pin1 = 16;
    const uint gpio_pwm_pin2 = 17;

    // Tell GPIO 16 and 17 they are allocated to the PWM
    gpio_set_function(gpio_pwm_pin1, GPIO_FUNC_PWM);
    gpio_set_function(gpio_pwm_pin2, GPIO_FUNC_PWM);

    // Find out which PWM slice is connected to GPIO 0 (it's slice 0)
    uint slice_num = pwm_gpio_to_slice_num(0);

    // Set period of 4 cycles (0 to 3 inclusive)
    pwm_set_wrap(slice_num, 3);
    // Set channel A output high for one cycle before dropping
    pwm_set_chan_level(slice_num, PWM_CHAN_A, 1);
    // Set initial B output high for three cycles before dropping
    pwm_set_chan_level(slice_num, PWM_CHAN_B, 3);
    // Set the PWM running
    pwm_set_enabled(slice_num, true);

    // Note we could also use pwm_set_gpio_level(gpio, x) which looks up the
    // correct slice and channel for a given GPIO.
    while (1)
        tight_loop_contents();
}