Espressif ESP32-S2 Programming Manual page 240

Chapter 2. API Reference
ADC_CHANNEL_5
ADC channel
ADC_CHANNEL_6
ADC channel
ADC_CHANNEL_7
ADC channel
ADC_CHANNEL_8
ADC channel
ADC_CHANNEL_9
ADC channel
ADC_CHANNEL_MAX
enum adc_atten_t
ADC attenuation parameter.
adc1_config_channel_atten.
Values:
ADC_ATTEN_DB_0 = 0
No input attenumation, ADC can measure up to approx. 800 mV.
ADC_ATTEN_DB_2_5 = 1
The input voltage of ADC will be attenuated extending the range of measurement by about 2.5 dB (1.33
x)
ADC_ATTEN_DB_6 = 2
The input voltage of ADC will be attenuated extending the range of measurement by about 6 dB (2 x)
ADC_ATTEN_DB_11 = 3
The input voltage of ADC will be attenuated extending the range of measurement by about 11 dB (3.55
x)
ADC_ATTEN_MAX
enum adc_bits_width_t
ADC resolution setting option.
Note Only used in single read mode
Values:
ADC_WIDTH_BIT_13 = 4
ADC capture width is 13Bit.
ADC_WIDTH_MAX
enum adc_digi_convert_mode_t
ADC digital controller (DMA mode) work mode.
Values:
ADC_CONV_SINGLE_UNIT_1 = 1
Only use ADC1 for conversion.
ADC_CONV_SINGLE_UNIT_2 = 2
Only use ADC2 for conversion.
ADC_CONV_BOTH_UNIT = 3
Use Both ADC1 and ADC2 for conversion simultaneously.
ADC_CONV_ALTER_UNIT = 7
Use both ADC1 and ADC2 for conversion by turn. e.g. ADC1 -> ADC2 -> ADC1 -> ADC2 .....
ADC_CONV_UNIT_MAX
Espressif Systems
Different parameters determine the range of the ADC. See
229
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