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

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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::interrupt;
use embassy_stm32::usart::{BufferedUart, Config};
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use embedded_io::asynch::{Read, Write};
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_stm32::init(Default::default());
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info!("Hi!");
static mut TX_BUFFER: [u8; 8] = [0; 8];
static mut RX_BUFFER: [u8; 256] = [0; 256];
let mut config = Config::default();
config.baudrate = 9600;
let irq = interrupt::take!(USART2);
let mut usart = unsafe { BufferedUart::new(p.USART2, irq, p.PA3, p.PA2, &mut TX_BUFFER, &mut RX_BUFFER, config) };
usart.write_all(b"Hello Embassy World!\r\n").await.unwrap();
info!("wrote Hello, starting echo");
let mut buf = [0; 4];
loop {
usart.read_exact(&mut buf[..]).await.unwrap();
usart.write_all(&buf[..]).await.unwrap();
}
}