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#![no_std]
#![no_main]
use core::mem::MaybeUninit;
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::rng::{self, Rng};
use embassy_stm32::time::Hertz;
use embassy_stm32::{SharedData, bind_interrupts, peripherals};
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs{
RNG => rng::InterruptHandler<peripherals::RNG>;
});
#[unsafe(link_section = ".shared_data")]
static SHARED_DATA: MaybeUninit<SharedData> = MaybeUninit::uninit();
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = embassy_stm32::Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hse = Some(Hse {
freq: Hertz(32_000_000),
mode: HseMode::Bypass,
prescaler: HsePrescaler::DIV1,
});
config.rcc.sys = Sysclk::PLL1_R;
config.rcc.pll = Some(Pll {
source: PllSource::HSE,
prediv: PllPreDiv::DIV2,
mul: PllMul::MUL6,
divp: None,
divq: Some(PllQDiv::DIV2), // PLL1_Q clock (32 / 2 * 6 / 2), used for RNG
divr: Some(PllRDiv::DIV2), // sysclk 48Mhz clock (32 / 2 * 6 / 2)
});
}
let p = embassy_stm32::init_primary(config, &SHARED_DATA);
info!("Hello World!");
let mut rng = Rng::new(p.RNG, Irqs);
let mut buf = [0u8; 16];
unwrap!(rng.async_fill_bytes(&mut buf).await);
info!("random bytes: {:02x}", buf);
loop {}
}
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