embassy/examples/rp/src/bin/uart_unidir.rs

//! This example shows how to use UART (Universal asynchronous receiver-transmitter) in the RP2040 chip.
//!
//! Test TX-only and RX-only on two different UARTs. You need to connect GPIO0 to GPIO5 for
//! this to work
//! The Raspberry Pi Debug Probe (https://www.raspberrypi.com/products/debug-probe/) could be used
//! with its UART port.

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

use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::bind_interrupts;
use embassy_rp::peripherals::UART1;
use embassy_rp::uart::{Async, Config, InterruptHandler, UartRx, UartTx};
use embassy_time::{Duration, Timer};
use {defmt_rtt as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    UART1_IRQ => InterruptHandler<UART1>;
});

#[embassy_executor::main]
async fn main(spawner: Spawner) {
    let p = embassy_rp::init(Default::default());

    let mut uart_tx = UartTx::new(p.UART0, p.PIN_0, p.DMA_CH0, Config::default());
    let uart_rx = UartRx::new(p.UART1, p.PIN_5, Irqs, p.DMA_CH1, Config::default());

    unwrap!(spawner.spawn(reader(uart_rx)));

    info!("Writing...");
    loop {
        let data = [1u8, 2, 3, 4, 5, 6, 7, 8];
        info!("TX {:?}", data);
        uart_tx.write(&data).await.unwrap();
        Timer::after(Duration::from_secs(1)).await;
    }
}

#[embassy_executor::task]
async fn reader(mut rx: UartRx<'static, UART1, Async>) {
    info!("Reading...");
    loop {
        // read a total of 4 transmissions (32 / 8) and then print the result
        let mut buf = [0; 32];
        rx.read(&mut buf).await.unwrap();
        info!("RX {:?}", buf);
    }
}