Constant esp_idf_sys::adc_digi_convert_mode_t_ADC_CONV_ALTER_UNIT

pub const adc_digi_convert_mode_t_ADC_CONV_ALTER_UNIT: adc_digi_convert_mode_t = 7;

< Use both ADC1 and ADC2 for conversion by turn. e.g. ADC1 -> ADC2 -> ADC1 -> ADC2 …..