embassy/examples/stm32l4/src/bin/usart.rs

#![no_std]
#![no_main]
#![feature(trait_alias)]
#![feature(type_alias_impl_trait)]
#![allow(incomplete_features)]

#[path = "../example_common.rs"]
mod example_common;

use embassy_stm32::dbgmcu::Dbgmcu;
use embassy_stm32::dma::NoDma;
use embassy_stm32::usart::{Config, Uart};
use embedded_hal::blocking::serial::Write;
use example_common::*;

#[cortex_m_rt::entry]
fn main() -> ! {
    info!("Hello World!");

    unsafe {
        Dbgmcu::enable_all();
    }

    let p = embassy_stm32::init(Default::default());

    let config = Config::default();
    let mut usart = Uart::new(p.UART4, p.PA1, p.PA0, NoDma, NoDma, config);

    usart.bwrite_all(b"Hello Embassy World!\r\n").unwrap();
    info!("wrote Hello, starting echo");

    let mut buf = [0u8; 1];
    loop {
        usart.read_blocking(&mut buf).unwrap();
        usart.bwrite_all(&buf).unwrap();
    }
}