44 lines
1.2 KiB
Rust
44 lines
1.2 KiB
Rust
#![no_std]
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#![no_main]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::rcc::mux::Clk48sel;
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use embassy_stm32::rng::Rng;
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use embassy_stm32::{bind_interrupts, peripherals, rng, Config};
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use {defmt_rtt as _, panic_probe as _};
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bind_interrupts!(struct Irqs {
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RNG_CRYP => rng::InterruptHandler<peripherals::RNG>;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let mut config = Config::default();
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{
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use embassy_stm32::rcc::*;
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config.rcc.hsi = true;
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config.rcc.pll = Some(Pll {
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source: PllSource::HSI, // 16 MHz
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prediv: PllPreDiv::DIV1,
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mul: PllMul::MUL7, // 16 * 7 = 112 MHz
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divp: None,
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divq: None,
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divr: Some(PllRDiv::DIV2), // 112 / 2 = 56 MHz
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});
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config.rcc.sys = Sysclk::PLL1_R;
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config.rcc.hsi48 = Some(Hsi48Config { sync_from_usb: false }); // needed for RNG
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config.rcc.mux.clk48sel = Clk48sel::HSI48; // needed for RNG (or use MSI or PLLQ if you want)
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}
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let p = embassy_stm32::init(config);
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info!("Hello World!");
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let mut rng = Rng::new(p.RNG, Irqs);
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let mut buf = [0u8; 16];
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unwrap!(rng.async_fill_bytes(&mut buf).await);
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info!("random bytes: {:02x}", buf);
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}
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