Method is_loop

devices/src/legacy/serial.rs:199–201

(&self)

    }

    fn is_loop(&self) -> bool {
        (self.modem_control & MCR_LOOP_BIT) != 0
    }

    fn add_intr_bit(&mut self, bit: u8) {
        self.interrupt_identification &= !IIR_NONE_BIT;