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esp_err_t image_init_clock(void) {
	ledc_timer_bit_t bit_num = (ledc_timer_bit_t) XVCLK_BIT_ACCURACY;		// 3

	// Enable LEDC PWM peripheral
	periph_module_enable(PERIPH_LEDC_MODULE);

	// Set Duty
	int duty = pow(2, (int) bit_num) / 2;

	// setup the timer
	ledc_timer_config_t xvclk_timer;
	xvclk_timer.bit_num = bit_num;						// 3
	xvclk_timer.freq_hz = XVCLK_FREQ;					// 10000000
	xvclk_timer.speed_mode = LEDC_HIGH_SPEED_MODE;
	xvclk_timer.timer_num = LEDC_TIMER_0;
	ledc_timer_config(&xvclk_timer);

	// setup the pwm channel
	ledc_channel_config_t servo_channel;
	servo_channel.channel = LEDC_CHANNEL_0;
	servo_channel.duty = duty;
	servo_channel.gpio_num = IMG_XVCLK;					// GPIO_NUM_4
	servo_channel.intr_type = LEDC_INTR_DISABLE;
	servo_channel.speed_mode = LEDC_HIGH_SPEED_MODE;
	servo_channel.timer_sel = LEDC_TIMER_0;
	ledc_channel_config(&servo_channel);

	// Set the PWM to the duty specified
	ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, duty);
	ledc_update_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0);
	
	return ESP_OK;
}