embassy/examples/stm32l4/src/bin/usart_dma.rs

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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use core::fmt::Write;
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use defmt::*;
use embassy_executor::Spawner;
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use embassy_stm32::dma::NoDma;
use embassy_stm32::interrupt;
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use embassy_stm32::usart::{Config, Uart};
use heapless::String;
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_stm32::init(Default::default());
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info!("Hello World!");
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let config = Config::default();
let irq = interrupt::take!(UART4);
let mut usart = Uart::new(p.UART4, p.PA1, p.PA0, irq, p.DMA1_CH3, NoDma, config);
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for n in 0u32.. {
let mut s: String<128> = String::new();
core::write!(&mut s, "Hello DMA World {}!\r\n", n).unwrap();
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info!("Writing...");
usart.write(s.as_bytes()).await.ok();
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info!("wrote DMA");
}
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}