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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use core::fmt::Write;
use core::str::from_utf8;
use cortex_m_rt::entry;
use defmt::*;
use embassy_executor::executor::Executor;
use embassy_stm32::peripherals::{DMA1_CH3, DMA1_CH4, SPI3};
use embassy_stm32::time::mhz;
use embassy_stm32::{spi, Config};
use embassy_util::Forever;
use heapless::String;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::task]
async fn main_task(mut spi: spi::Spi<'static, SPI3, DMA1_CH3, DMA1_CH4>) {
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: Forever<Executor> = Forever::new();
#[entry]
fn main() -> ! {
info!("Hello World!");
let mut config = Config::default();
config.rcc.sys_ck = Some(mhz(400));
config.rcc.hclk = Some(mhz(200));
config.rcc.pll1.q_ck = Some(mhz(100));
let p = embassy_stm32::init(config);
let spi = spi::Spi::new(
p.SPI3,
p.PB3,
p.PB5,
p.PB4,
p.DMA1_CH3,
p.DMA1_CH4,
mhz(1),
spi::Config::default(),
);
let executor = EXECUTOR.put(Executor::new());
executor.run(|spawner| {
unwrap!(spawner.spawn(main_task(spi)));
})
}
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