pub fn into_async(self) -> I2s<'d, Async> {
        I2s {
            i2s_rx: RxCreator {
                i2s: self.i2s_rx.i2s,
                rx_channel: self.i2s_rx.rx_channel.into_async(),
                guard: self.i2s_rx.guard,
            },
            i2s_tx: TxCreator {
                i2s: self.i2s_tx.i2s,
                tx_channel: self.i2s_tx.tx_channel.into_async(),
                guard: self.i2s_tx.guard,
            },
        }
    }
Converts the I2S instance into async mode.
esp-hal/src/i2s/master.rs