Espressif ESP32-S2 Programming Manual page 241

Chapter 2. API Reference
enum adc_digi_output_format_t
ADC digital controller (DMA mode) output data format option.
Values:
ADC_DIGI_FORMAT_12BIT
ADC to DMA
(adc_digi_output_data_t). Note: For single convert mode.
ADC_DIGI_FORMAT_11BIT
ADC to DMA data format, [15]-adc unit, [14:11]-channel, [10:
(adc_digi_output_data_t). Note: For multi or alter convert mode.
ADC_DIGI_FORMAT_MAX
ADC_DIGI_OUTPUT_FORMAT_TYPE1
See adc_digi_output_data_t.type1
ADC_DIGI_OUTPUT_FORMAT_TYPE2
See adc_digi_output_data_t.type2
enum adc_arbiter_mode_t
ADC arbiter work mode option.
Note ESP32-S2: Only ADC2 support arbiter.
Values:
ADC_ARB_MODE_SHIELD
Force shield arbiter, Select the highest priority controller to work.
ADC_ARB_MODE_FIX
Fixed priority switch controller mode.
ADC_ARB_MODE_LOOP
Loop priority switch controller mode. Each controller has the same priority, and the arbiter will switch
to the next controller after the measurement is completed.
enum adc_digi_filter_idx_t
ADC digital controller (DMA mode) filter index options.
Note For ESP32-S2, The filter object of the ADC is fixed.
Values:
ADC_DIGI_FILTER_IDX0 = 0
The filter index 0. For ESP32-S2, It can only be used to filter all enabled channels of ADC1 unit at the
same time.
ADC_DIGI_FILTER_IDX1
The filter index 1. For ESP32-S2, It can only be used to filter all enabled channels of ADC2 unit at the
same time.
ADC_DIGI_FILTER_IDX_MAX
enum adc_digi_filter_mode_t
ADC digital controller (DMA mode) filter type options. Expression: filter_data = (k-1)/k * last_data +
new_data / k.
Values:
ADC_DIGI_FILTER_IIR_2 = 0
The filter mode is first-order IIR filter. The coefficient is 2.
ADC_DIGI_FILTER_IIR_4
The filter mode is first-order IIR filter. The coefficient is 4.
ADC_DIGI_FILTER_IIR_8
The filter mode is first-order IIR filter. The coefficient is 8.
Espressif Systems
data format, [15:12]-channel,
230
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[11: 0]-12 bits
0]-11 bits ADC data
ADC data
Release v4.4