/*
   Forum: https://forum.arduino.cc/t/nesso-n1-how-do-i-write-pwm-with-ledc/1427843/17
   Wokwi: https://wokwi.com/projects/454591390217129985

  2026/01/30
  ec2021

  Generating sound on pin 11 using espressif ledc.h library

  Code was generated by ChatGPT but with

  .speed_mode       = LEDC_HIGH_SPEED_MODE

  which leads to a compilation error:
  "error: 'LEDC_HIGH_SPEED_MODE' was not declared in this scope; did you mean 'LEDC_LOW_SPEED_MODE'?""

  Compiles and works after changing to

  .speed_mode       = LEDC_LOW_SPEED_MODE

*/

#include <driver/ledc.h>

const int BEEP_PIN = 11;
const int PWM_CHANNEL = 0;
const int PWM_FREQ = 2000;
const int PWM_RES = 8; // 8-bit resolution

void setup() {
  ledc_timer_config_t ledc_timer = {
    .speed_mode       = LEDC_LOW_SPEED_MODE,
    .duty_resolution  = (ledc_timer_bit_t)PWM_RES,
    .timer_num        = LEDC_TIMER_0,
    .freq_hz          = PWM_FREQ,
    .clk_cfg          = LEDC_AUTO_CLK
  };
  ledc_timer_config(&ledc_timer);

  ledc_channel_config_t ledc_channel = {
    .gpio_num       = BEEP_PIN,
    .speed_mode     = LEDC_LOW_SPEED_MODE,
    .channel        = (ledc_channel_t)PWM_CHANNEL,
    .intr_type      = LEDC_INTR_DISABLE,
    .timer_sel      = LEDC_TIMER_0,
    .duty           = 128, // 50%
    .hpoint         = 0
  };
  ledc_channel_config(&ledc_channel);
}

void loop() { }