#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::dma::NoDma;
use embassy_stm32::gpio::{Level, Output, Speed};
use embassy_stm32::spi::{Config, Spi};
use embassy_stm32::time::Hertz;
use {defmt_rtt as _, panic_probe as _};

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_stm32::init(Default::default());
    info!("Hello World, folks!");

    let mut spi_config = Config::default();
    spi_config.frequency = Hertz(1_000_000);

    let mut spi = Spi::new(p.SPI1, p.PB3, p.PA7, p.PA6, NoDma, NoDma, spi_config);

    let mut cs = Output::new(p.PA15, Level::High, Speed::VeryHigh);

    loop {
        let mut buf = [0x0Au8; 4];
        cs.set_low();
        unwrap!(spi.blocking_transfer_in_place(&mut buf));
        cs.set_high();
        info!("xfer {=[u8]:x}", buf);
    }
}