Constant esp_idf_sys::i2s_mode_t_I2S_MODE_DAC_BUILT_IN

pub const i2s_mode_t_I2S_MODE_DAC_BUILT_IN: i2s_mode_t = 16;

< Output I2S data to built-in DAC, no matter the data format is 16bit or 32 bit, the DAC module will only take the 8bits from MSB