My solution
You will find my solution in src/main.rs
:
#![no_main] #![no_std] use core::fmt::Write; use cortex_m_rt::entry; use heapless::Vec; use microbit::hal::uarte::{self, Baudrate, Parity}; use panic_rtt_target as _; use rtt_target::rtt_init_print; use serial_setup::UartePort; #[entry] fn main() -> ! { rtt_init_print!(); let board = microbit::Board::take().unwrap(); let mut serial = { let serial = uarte::Uarte::new( board.UARTE0, board.uart.into(), Parity::EXCLUDED, Baudrate::BAUD115200, ); UartePort::new(serial) }; // A buffer with 32 bytes of capacity let mut buffer: Vec<u8, 32> = Vec::new(); loop { buffer.clear(); loop { // We assume that the receiving cannot fail let byte = serial.read().unwrap(); if buffer.push(byte).is_err() { write!(serial, "error: buffer full\r\n").unwrap(); break; } if byte == b'\r' { for byte in buffer.iter().rev().chain(&[b'\n', b'\r']) { serial.write(*byte).unwrap(); } break; } } serial.flush().unwrap() } }