impl io::Read for Rx<$USARTX>
            where
                Rx<$USARTX>: embedded_hal::serial::Read<u8>,
            {
                fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
                    let length = buf.len();
                    for i in 0..length {
                        let byte = block!(self.read().unwrap());
                        buf[i] = byte;
                    }
                    Ok(length)
                }
            }