Chapter 2. API Reference
• [in] chars: Pointer to initialized ADC characteristics structure
• [out] voltage: Pointer to store converted voltage
Structures
struct esp_adc_cal_characteristics_t
Structure storing characteristics of an ADC.
Note Call esp_adc_cal_characterize() to initialize the structure
Public Members
adc_unit_t adc_num
ADC number
adc_atten_t atten
ADC attenuation
adc_bits_width_t bit_width
ADC bit width
uint32_t coeff_a
Gradient of ADC-Voltage curve
uint32_t coeff_b
Offset of ADC-Voltage curve
uint32_t vref
Vref used by lookup table
const uint32_t *low_curve
Pointer to low Vref curve of lookup table (NULL if unused)
const uint32_t *high_curve
Pointer to high Vref curve of lookup table (NULL if unused)
uint8_t version
ADC Calibration
Enumerations
enum esp_adc_cal_value_t
Type of calibration value used in characterization.
Values:
ESP_ADC_CAL_VAL_EFUSE_VREF = 0
Characterization based on reference voltage stored in eFuse
ESP_ADC_CAL_VAL_EFUSE_TP = 1
Characterization based on Two Point values stored in eFuse
ESP_ADC_CAL_VAL_DEFAULT_VREF = 2
Characterization based on default reference voltage
ESP_ADC_CAL_VAL_EFUSE_TP_FIT = 3
Characterization based on Two Point values and fitting curve coefficients stored in eFuse
ESP_ADC_CAL_VAL_MAX
ESP_ADC_CAL_VAL_NOT_SUPPORTED = ESP_ADC_CAL_VAL_MAX
GPIO Lookup Macros
Espressif Systems 233
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