/*
  Raspberry Pi Pico SDK PWM Example

  Use the logic analyzer to view the signals: https://docs.wokwi.com/guides/logic-analyzer
*/

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

int main() {
  gpio_set_function(0, GPIO_FUNC_PWM);
  gpio_set_function(1, 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);
  pwm_set_clkdiv(slice_num, 125); // PWM clock should now be running at 1MHz
  pwm_set_wrap(slice_num, 1023);  // Set period of 1024 cycles (0 to 1023 inclusive)
  pwm_set_enabled(slice_num, true);

  int duty = 0;
  int direction = 1;
  while (1) {
    duty += 50 * direction;
    if (duty >= 1024) {
      duty = 1024;
      direction = -1;
    }
    if (duty <= 0) {
      duty = 0;
      direction = 1;
    }
    pwm_set_chan_level(slice_num, PWM_CHAN_A, 1024 - duty);
    pwm_set_chan_level(slice_num, PWM_CHAN_B, duty);
    sleep_ms(100);
  }
}