DAC channel 0 is GPIO25(ESP32) / GPIO17(ESP32S2).
DAC channel 1 is GPIO26(ESP32) / GPIO18(ESP32S2).
__attribute__((deprecated("please use 'DAC_CHAN_0' instead"))) = 0
Alias of 'DAC_CHAN_0', now the channel index start from '0'.
__attribute__((deprecated("please use 'DAC_CHAN_1' instead"))) = 1
Alias of 'DAC_CHAN_1', now the channel index start from '0'.