Constant esp_idf_sys::i2s_slot_mode_t_I2S_SLOT_MODE_MONO

pub const i2s_slot_mode_t_I2S_SLOT_MODE_MONO: i2s_slot_mode_t = 1;

< I2S channel slot format mono, transmit same data in all slots for tx mode, only receive the data in the first slots for rx mode.