47 lines
1.3 KiB
Rust
47 lines
1.3 KiB
Rust
#![no_std]
|
|
#![no_main]
|
|
|
|
use core::fmt::Write;
|
|
use core::str::from_utf8;
|
|
|
|
use cortex_m_rt::entry;
|
|
use defmt::*;
|
|
use embassy_executor::Executor;
|
|
use embassy_stm32::mode::Async;
|
|
use embassy_stm32::spi;
|
|
use embassy_stm32::time::mhz;
|
|
use heapless::String;
|
|
use static_cell::StaticCell;
|
|
use {defmt_rtt as _, panic_probe as _};
|
|
|
|
#[embassy_executor::task]
|
|
async fn main_task(mut spi: spi::Spi<'static, Async>) {
|
|
for n in 0u32.. {
|
|
let mut write: String<128> = String::new();
|
|
let mut read = [0; 128];
|
|
core::write!(&mut write, "Hello DMA World {}!\r\n", n).unwrap();
|
|
// transfer will slice the &mut read down to &write's actual length.
|
|
spi.transfer(&mut read, write.as_bytes()).await.ok();
|
|
info!("read via spi+dma: {}", from_utf8(&read).unwrap());
|
|
}
|
|
}
|
|
|
|
static EXECUTOR: StaticCell<Executor> = StaticCell::new();
|
|
|
|
#[entry]
|
|
fn main() -> ! {
|
|
info!("Hello World!");
|
|
let p = embassy_stm32::init(Default::default());
|
|
|
|
let mut spi_config = spi::Config::default();
|
|
spi_config.frequency = mhz(1);
|
|
|
|
let spi = spi::Spi::new(p.SPI3, p.PB3, p.PB5, p.PB4, p.GPDMA1_CH0, p.GPDMA1_CH1, spi_config);
|
|
|
|
let executor = EXECUTOR.init(Executor::new());
|
|
|
|
executor.run(|spawner| {
|
|
unwrap!(spawner.spawn(main_task(spi)));
|
|
})
|
|
}
|