/*
const int PWM_CHANNEL = 0;    // ESP32 has 16 channels which can generate 16 independent waveforms
const int PWM_FREQ = 50000;     // Recall that Arduino Uno is ~490 Hz. Official ESP32 example uses 5,000Hz
const int PWM_RESOLUTION = 8; // We'll use same resolution as Uno (8 bits, 0-255) but ESP32 can go up to 16 bits 

// The max duty cycle value based on PWM resolution (will be 255 if resolution is 8 bits)
const int MAX_DUTY_CYCLE = (int)(pow(2, PWM_RESOLUTION) - 1); 

const int LED_OUTPUT_PIN = 18;

const int DELAY_MS = 4;  // delay between fade increments

void setup() {

  // Sets up a channel (0-15), a PWM duty cycle frequency, and a PWM resolution (1 - 16 bits) 
  // ledcSetup(uint8_t channel, double freq, uint8_t resolution_bits);
  ledcSetup(PWM_CHANNEL, PWM_FREQ, PWM_RESOLUTION);

  // ledcAttachPin(uint8_t pin, uint8_t channel);
  ledcAttachPin(LED_OUTPUT_PIN, PWM_CHANNEL);
}

void loop() {

  // fade up PWM on given channel
  for(int dutyCycle = 0; dutyCycle <= MAX_DUTY_CYCLE; dutyCycle++){   
    ledcWrite(PWM_CHANNEL, dutyCycle);
    delay(DELAY_MS);
  }

  // fade down PWM on given channel
  for(int dutyCycle = MAX_DUTY_CYCLE; dutyCycle >= 0; dutyCycle--){
    ledcWrite(PWM_CHANNEL, dutyCycle);   
    delay(DELAY_MS);
  }
}
*/

#include <pwmWrite.h>
//const byte pwm21 = 21;
const byte pwm19 = 18;
Pwm pwm = Pwm();
const int PWM_RESOLUTION = 6;
const int MAX_DUTY_CYCLE = (int)(pow(2, PWM_RESOLUTION) - 1); 
const int DELAY_MS = 4;
void setup() {
  Serial.begin(115200);
 
 /* 
  pwm.pause();
  pwm.write(pwm21, 64, 300000);
  pwm.write(pwm19, 128, 300000);
  pwm.resume();
  pwm.printDebug();
  */
}

void loop() {
    for(int dutyCycle = 0; dutyCycle <= MAX_DUTY_CYCLE; dutyCycle++){   
  pwm.pause();
  pwm.write(pwm19, dutyCycle, 30000);
  pwm.resume();
  //pwm.printDebug();
    delay(DELAY_MS);
  }

    for(int dutyCycle = MAX_DUTY_CYCLE; dutyCycle >= 0; dutyCycle--){
      pwm.pause();
      pwm.write(pwm19, dutyCycle, 30000);
  pwm.resume();
  //pwm.printDebug();  
    delay(DELAY_MS);
  }
}