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#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::Config;
use embassy_stm32::gpio::{Level, Output, Speed};
use embassy_stm32::rcc::{
AHB5Prescaler, AHBPrescaler, APBPrescaler, PllDiv, PllMul, PllPreDiv, PllSource, Sysclk, VoltageScale,
};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let mut config = Config::default();
// Fine-tune PLL1 dividers/multipliers
config.rcc.pll1 = Some(embassy_stm32::rcc::Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV1, // PLLM = 1 → HSI / 1 = 16 MHz
mul: PllMul::MUL30, // PLLN = 30 → 16 MHz * 30 = 480 MHz VCO
divr: Some(PllDiv::DIV5), // PLLR = 5 → 96 MHz (Sysclk)
// divq: Some(PllDiv::DIV10), // PLLQ = 10 → 48 MHz (NOT USED)
divq: None,
divp: Some(PllDiv::DIV30), // PLLP = 30 → 16 MHz (USBOTG)
frac: Some(0), // Fractional part (enabled)
});
config.rcc.ahb_pre = AHBPrescaler::DIV1;
config.rcc.apb1_pre = APBPrescaler::DIV1;
config.rcc.apb2_pre = APBPrescaler::DIV1;
config.rcc.apb7_pre = APBPrescaler::DIV1;
config.rcc.ahb5_pre = AHB5Prescaler::DIV4;
// voltage scale for max performance
config.rcc.voltage_scale = VoltageScale::RANGE1;
// route PLL1_P into the USB‐OTG‐HS block
config.rcc.sys = Sysclk::PLL1_R;
let p = embassy_stm32::init(config);
info!("Hello World!");
// LD2 - PC4
let mut led = Output::new(p.PC4, Level::High, Speed::Low);
loop {
info!("high");
led.set_high();
Timer::after_millis(500).await;
info!("low");
led.set_low();
Timer::after_millis(500).await;
}
}
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