embassy/tests/stm32/src/bin/usart_dma.rs

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

#[path = "../example_common.rs"]
mod example_common;
use defmt::assert_eq;
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_stm32::interrupt;
use embassy_stm32::usart::{Config, Uart};
use example_common::*;

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_stm32::init(config());
    info!("Hello World!");

    // Arduino pins D0 and D1
    // They're connected together with a 1K resistor.
    #[cfg(feature = "stm32f103c8")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) = (
        p.PA9,
        p.PA10,
        p.USART1,
        interrupt::take!(USART1),
        p.DMA1_CH4,
        p.DMA1_CH5,
    );
    #[cfg(feature = "stm32g491re")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) =
        (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1), p.DMA1_CH1, p.DMA1_CH2);
    #[cfg(feature = "stm32g071rb")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) =
        (p.PC4, p.PC5, p.USART1, interrupt::take!(USART1), p.DMA1_CH1, p.DMA1_CH2);
    #[cfg(feature = "stm32f429zi")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) = (
        p.PG14,
        p.PG9,
        p.USART6,
        interrupt::take!(USART6),
        p.DMA2_CH6,
        p.DMA2_CH1,
    );
    #[cfg(feature = "stm32wb55rg")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) = (
        p.PA2,
        p.PA3,
        p.LPUART1,
        interrupt::take!(LPUART1),
        p.DMA1_CH1,
        p.DMA1_CH2,
    );
    #[cfg(feature = "stm32h755zi")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) =
        (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1), p.DMA1_CH0, p.DMA1_CH1);
    #[cfg(feature = "stm32u585ai")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) = (
        p.PD8,
        p.PD9,
        p.USART3,
        interrupt::take!(USART3),
        p.GPDMA1_CH0,
        p.GPDMA1_CH1,
    );
    #[cfg(feature = "stm32h563zi")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) = (
        p.PB6,
        p.PB7,
        p.LPUART1,
        interrupt::take!(LPUART1),
        p.GPDMA1_CH0,
        p.GPDMA1_CH1,
    );
    #[cfg(feature = "stm32c031c6")]
    let (tx, rx, usart, irq, tx_dma, rx_dma) =
        (p.PB6, p.PB7, p.USART1, interrupt::take!(USART1), p.DMA1_CH1, p.DMA1_CH2);

    let config = Config::default();
    let usart = Uart::new(usart, rx, tx, irq, tx_dma, rx_dma, config);

    const LEN: usize = 128;
    let mut tx_buf = [0; LEN];
    let mut rx_buf = [0; LEN];
    for i in 0..LEN {
        tx_buf[i] = i as u8;
    }

    let (mut tx, mut rx) = usart.split();

    let tx_fut = async {
        tx.write(&tx_buf).await.unwrap();
    };
    let rx_fut = async {
        rx.read(&mut rx_buf).await.unwrap();
    };

    // note: rx needs to be polled first, to workaround this bug:
    // https://github.com/embassy-rs/embassy/issues/1426
    join(rx_fut, tx_fut).await;

    assert_eq!(tx_buf, rx_buf);

    info!("Test OK");
    cortex_m::asm::bkpt();
}