#include "adc_reader.h"

extern "C" {
#include "esp_adc/adc_oneshot.h"
}

static adc_oneshot_unit_handle_t adc_handle;

void adc_reader_init() {
    adc_oneshot_unit_init_cfg_t init_config = {};
    init_config.unit_id = ADC_UNIT_1;

    adc_oneshot_new_unit(&init_config, &adc_handle);

    adc_oneshot_chan_cfg_t config = {};
    config.atten = ADC_ATTEN_DB_12;
    config.bitwidth = ADC_BITWIDTH_DEFAULT;

    adc_oneshot_config_channel(adc_handle, ADC_CHANNEL_7, &config); // GPIO35
}

int adc_reader_read() {
    int val = 0;
    adc_oneshot_read(adc_handle, ADC_CHANNEL_7, &val);
    return val;
}