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#define J1772_LEDC_TIMER      LEDC_TIMER_0
#define J1772_LEDC_CHANNEL    LEDC_CHANNEL_0
#define J1772_LEDC_TIMER_RES  LEDC_TIMER_10_BIT
#define J1772_DUTY_MAX        1023

void ledc_init() {
	esp_err_t err;
	/* Prepare and set configuration of timers
	 * that will be used by LED Controller */
	ledc_timer_config_t ledc_timer;
	memset((void *)&ledc_timer,0,sizeof(ledc_timer));
	ledc_timer.speed_mode = LEDC_HIGH_SPEED_MODE;		// timer mode
	ledc_timer.duty_resolution = J1772_LEDC_TIMER_RES;	// resolution of PWM duty
	ledc_timer.timer_num = J1772_LEDC_TIMER;		// timer index
	ledc_timer.freq_hz = 1000;				// frequency of PWM signal
	//ledc_timer_resume(LEDC_HIGH_SPEED_MODE, J1772_LEDC_TIMER);

	// Set configuration of timer0 for high speed channels
	err = ledc_timer_config(&ledc_timer);
	ledc_channel_config_t ledc_channel = {
			.gpio_num   = j1772_pilot_GPIO,
			.speed_mode = LEDC_HIGH_SPEED_MODE,
			.channel    = J1772_LEDC_CHANNEL,
			.intr_type  = LEDC_INTR_DISABLE,
			.timer_sel  = J1772_LEDC_TIMER,
			.duty       = J1772_DUTY_MAX,
			.hpoint     = 0					// TODO: AD 10.11.2018: new, does 0 work (0xfffff does not work)
	};
	err = ledc_channel_config(&ledc_channel);
}

void ledcSetDuty (int pwmPercent) {
	const char * ME = __func__;

	if ((pwmPercent == 0) | (pwmPercent == 100)) {
		// set the port to 0 or 1 without pwm, 100% is unstable, we get glitches
		ledc_stop(LEDC_HIGH_SPEED_MODE, J1772_LEDC_CHANNEL, (pwmPercent == 100) );
	} else {
		uint32_t duty;
		duty = (pwmPercent * J1772_DUTY_MAX) / 100;	// duty for timer (0..1023)
		esp_err_t err;
		err = ledc_set_duty(LEDC_HIGH_SPEED_MODE, J1772_LEDC_CHANNEL, duty);
		if (err != ESP_OK) ESP_LOGE(TAG, "ledc_set_duty returned %d", err);
		ledc_update_duty(LEDC_HIGH_SPEED_MODE, J1772_LEDC_CHANNEL);
	}
}

ledc_init();
ledcSetDuty (50);

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ledc_timer_config_t timer_config = {};
timer_config.timer_num = ledc_timer;
timer_config.duty_resolution = LEDC_TIMER_12_BIT;
timer_config.freq_hz = 1000U;
timer_config.speed_mode = LEDC_HIGH_SPEED_MODE;
ESP_ERROR_CHECK(ledc_timer_config(&timer_config));

ESP_ERROR_CHECK(ledc_timer_set(
	LEDC_HIGH_SPEED_MODE, ledc_timer, RESOLUTION, 256, LEDC_REF_TICK
));

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j -t
pilot -p 50

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ledc_mode_t speed_mode
ledc_timer_bit_t duty_resolution
ledc_timer_bit_t bit_num
ledc_timer_t timer_num
uint32_t freq_hz