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

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

#[path = "../example_common.rs"]
mod example_common;
use cortex_m::prelude::_embedded_hal_blocking_serial_Write;
use defmt::panic;
use embassy::executor::Spawner;
use embassy_stm32::dma::NoDma;
use embassy_stm32::usart::{Config, Uart};
use embassy_stm32::{pac, Peripherals};
use example_common::*;

#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
    info!("Hello World!");

    unsafe {
        pac::DBGMCU.cr().modify(|w| {
            w.set_dbg_sleep(true);
            w.set_dbg_standby(true);
            w.set_dbg_stop(true);
        });
    }

    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(&mut buf).unwrap();
        usart.bwrite_all(&buf).unwrap();
    }
}