Constant esp_idf_hal::sys::i2s_channel_t_I2S_CHANNEL_MONO

pub const i2s_channel_t_I2S_CHANNEL_MONO: i32 = 1;

< I2S channel (mono), one channel activated. In this mode, you only need to send one channel data but the fifo will copy same data for the other unactivated channels automatically, then both channels will transmit same data.