examples/stm32l1/src/bin/usart.rs


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#![no_std]
#![no_main]

use cortex_m_rt::entry;
use defmt::*;
use embassy_stm32::usart::{Config, Uart};
use embassy_stm32::{bind_interrupts, peripherals, usart};
use {defmt_rtt as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    USART2 => usart::InterruptHandler<peripherals::USART2>;
});

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

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

    let config = Config::default();
    let mut usart = Uart::new_blocking(p.USART2, p.PA3, p.PA2, config).unwrap();
    let desired_baudrate = 9600; // Default is 115200 and 9600 is used as example

    match usart.set_baudrate(desired_baudrate) {
        Ok(_) => info!("Baud rate set to {}", desired_baudrate),
        Err(err) => error!("Error setting baudrate to {}: {}", desired_baudrate, err),
    }

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

    let mut buf = [0u8; 1];
    loop {
        unwrap!(usart.blocking_read(&mut buf));
        unwrap!(usart.blocking_write(&buf));
    }
}