examples code:

#include <string.h>
#include <stdio.h>
#include "sdkconfig.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "esp_adc/adc_continuous.h"

#define EXAMPLE_ADC_UNIT ADC_UNIT_1
#define _EXAMPLE_ADC_UNIT_STR(unit) #unit ...