embassy/examples/stm32l0/src/bin/usart_dma.rs

#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use defmt_rtt as _; // global logger
use panic_probe as _;

use defmt::*;

use embassy::executor::Spawner;
use embassy_stm32::usart::{Config, Uart};
use embassy_stm32::Peripherals;

#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
    let mut usart = Uart::new(
        p.USART1,
        p.PB7,
        p.PB6,
        p.DMA1_CH2,
        p.DMA1_CH3,
        Config::default(),
    );

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

    let mut buf = [0; 1];
    loop {
        usart.read(&mut buf[..]).await.unwrap();
        usart.write(&buf[..]).await.unwrap();
    }
}