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Merge #559

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559: USART DMA example for the STM32F7 r=Dirbaio a=olofwalker

This small PR adds the USART DMA write an example for the STM32F7. The example has been tested on a Nucleo-f767zi board.

Output from `DEFMT_LOG=info cargo run --bin usart_dma`
```
Running `probe-run --chip STM32F767ZITx target/thumbv7em-none-eabihf/debug/usart_dma`
(HOST) INFO  flashing program (108 pages / 108.00 KiB)
(HOST) INFO  success!
────────────────────────────────────────────────────────────────────────────────
0 INFO  Hello World!
└─ usart_dma::__cortex_m_rt_main @ src/bin/usart_dma.rs:39
1 INFO  wrote DMA
└─ usart_dma::main_task::task::{generator#0} @ src/bin/usart_dma.rs:31
```

Co-authored-by: Robert Walker <rgit@walker.st>
This commit is contained in:
bors[bot] 2022-01-01 11:18:17 +00:00 committed by GitHub
commit f9a1c1fb51
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examples/stm32f7/src/bin/usart_dma.rs Normal file
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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
#[path = "../example_common.rs"]
mod example_common;
use core::fmt::Write;
use embassy::executor::Spawner;
use embassy_stm32::dma::NoDma;
use embassy_stm32::usart::{Config, Uart};
use embassy_stm32::Peripherals;
use embassy_traits::uart::Write as _Write;
use example_common::*;
use heapless::String;
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
let config = Config::default();
let mut usart = Uart::new(p.UART7, p.PA8, p.PA15, p.DMA1_CH1, NoDma, config);
for n in 0u32.. {
let mut s: String<128> = String::new();
core::write!(&mut s, "Hello DMA World {}!\r\n", n).unwrap();
unwrap!(usart.write(s.as_bytes()).await);
info!("wrote DMA");
}
}