#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/ledc.h"
#include "esp_err.h"

#define LEDC_TIMER          LEDC_TIMER_0
#define LEDC_MODE           LEDC_LOW_SPEED_MODE
#define LEDC_DUTY_RES       LEDC_TIMER_8_BIT
#define LEDC_FREQUENCY      500
#define LEDC_CHANNEL_R      LEDC_CHANNEL_0
#define LEDC_CHANNEL_G      LEDC_CHANNEL_1
#define LEDC_CHANNEL_B      LEDC_CHANNEL_2
#define LEDC_GPIO_R         33
#define LEDC_GPIO_G         25
#define LEDC_GPIO_B         26

static void set_color(uint8_t r, uint8_t g, uint8_t b)
{
  ledc_set_duty(LEDC_MODE, LEDC_CHANNEL_R, r);
  ledc_update_duty(LEDC_MODE, LEDC_CHANNEL_R);
  ledc_set_duty(LEDC_MODE, LEDC_CHANNEL_G, g);
  ledc_update_duty(LEDC_MODE, LEDC_CHANNEL_G);
  ledc_set_duty(LEDC_MODE, LEDC_CHANNEL_B, b);
  ledc_update_duty(LEDC_MODE, LEDC_CHANNEL_B);
}

void app_main(void)
{
  ledc_timer_config_t ledc_timer = {
    .speed_mode       = LEDC_MODE,
    .timer_num        = LEDC_TIMER,
    .duty_resolution  = LEDC_DUTY_RES,
    .freq_hz          = LEDC_FREQUENCY,
    .clk_cfg          = LEDC_AUTO_CLK
  };
  ledc_timer_config(&ledc_timer);

  ledc_channel_config_t ch[] = {
    { .channel = LEDC_CHANNEL_R, .duty = 0, .gpio_num = LEDC_GPIO_R, .speed_mode = LEDC_MODE, .hpoint = 0, .timer_sel = LEDC_TIMER },
    { .channel = LEDC_CHANNEL_G, .duty = 0, .gpio_num = LEDC_GPIO_G, .speed_mode = LEDC_MODE, .hpoint = 0, .timer_sel = LEDC_TIMER },
    { .channel = LEDC_CHANNEL_B, .duty = 0, .gpio_num = LEDC_GPIO_B, .speed_mode = LEDC_MODE, .hpoint = 0, .timer_sel = LEDC_TIMER },
  };

  for (int i = 0; i < 3; i++)
    ledc_channel_config(&ch[i]);

  uint8_t r = 255, g = 0, b = 0;
  int state = 0;

  while (1) {
    switch (state) {
      case 0: g++; if (g == 255) state++; break;   // Красный -> Жёлтый
      case 1: r--; if (r == 0)   state++; break;   // Жёлтый -> Зелёный
      case 2: b++; if (b == 255) state++; break;   // Зелёный -> Голубой
      case 3: g--; if (g == 0)   state++; break;   // Голубой -> Синий
      case 4: r++; if (r == 255) state++; break;   // Синий -> Фиолетовый
      case 5: b--; if (b == 0)   state = 0; break; // Фиолетовый -> Красный
    }

    set_color(r, g, b);
    vTaskDelay(pdMS_TO_TICKS(10));
  }
}