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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;
use embassy_stm32::dma::NoDma;
use embassy_stm32::peripherals::SPI3;
use embassy_stm32::time::mhz;
use embassy_stm32::{spi, Config};
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, SPI3, NoDma, NoDma>) {
for n in 0u32.. {
let mut write: String<128> = String::new();
core::write!(&mut write, "Hello DMA World {}!\r\n", n).unwrap();
unsafe {
let result = spi.blocking_transfer_in_place(write.as_bytes_mut());
if let Err(_) = result {
defmt::panic!("crap");
}
}
info!("read via spi: {}", from_utf8(write.as_bytes()).unwrap());
}
}
static EXECUTOR: StaticCell<Executor> = StaticCell::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 mut spi_config = spi::Config::default();
spi_config.frequency = mhz(1);
let spi = spi::Spi::new(p.SPI3, p.PB3, p.PB5, p.PB4, NoDma, NoDma, spi_config);
let executor = EXECUTOR.init(Executor::new());
executor.run(|spawner| {
unwrap!(spawner.spawn(main_task(spi)));
})
}
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