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#![no_std]
#![no_main]
#[path = "../common.rs"]
mod common;
use common::*;
use defmt::assert_eq;
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_stm32::usart::{Config, Error, Uart};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = init();
info!("Hello World!");
// Arduino pins D0 and D1
// They're connected together with a 1K resistor.
let usart = peri!(p, UART);
let rx = peri!(p, UART_RX);
let tx = peri!(p, UART_TX);
let rx_dma = peri!(p, UART_RX_DMA);
let tx_dma = peri!(p, UART_TX_DMA);
let irq = irqs!(UART);
let config = Config::default();
let usart = Uart::new(usart, rx, tx, irq, tx_dma, rx_dma, config).unwrap();
const LEN: usize = 128;
let mut tx_buf = [0; LEN];
let mut rx_buf = [0; LEN];
let (mut tx, mut rx) = usart.split();
let mut noise_count = 0;
for n in 0..42 {
for i in 0..LEN {
tx_buf[i] = (i ^ n) as u8;
}
let tx_fut = async {
tx.write(&tx_buf).await.unwrap();
};
let mut is_noisy = false;
let rx_fut = async {
match rx.read(&mut rx_buf).await {
Ok(()) => {}
Err(Error::Noise) => is_noisy = true,
_ => defmt::panic!(),
}
};
// 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;
if is_noisy {
noise_count += 1;
continue;
}
assert_eq!(tx_buf, rx_buf);
}
defmt::assert!(noise_count < 3);
// Test flush doesn't hang. Check multiple combinations of async+blocking.
tx.write(&tx_buf).await.unwrap();
tx.flush().await.unwrap();
tx.flush().await.unwrap();
tx.write(&tx_buf).await.unwrap();
tx.blocking_flush().unwrap();
tx.flush().await.unwrap();
tx.blocking_write(&tx_buf).unwrap();
tx.blocking_flush().unwrap();
tx.flush().await.unwrap();
tx.blocking_write(&tx_buf).unwrap();
tx.flush().await.unwrap();
tx.blocking_flush().unwrap();
info!("Test OK");
cortex_m::asm::bkpt();
}
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