blinky.md

Blinking LED

Example code: demo-blinky/src/main.rs

Blinking LED works the same way as for the Blue pill interface, all platform agnostic drivers work tha same way, but because Black pill carries a different microcontroller, stm32f4xx-hal hardware abstraction layer is used to to control all device hardware

[dependencies.stm32f4xx-hal]
version = "0.13.2"
features = ["stm32f411"]

STM32F4 HAL basic initialization is basically as follows:

#[entry]
fn main() -> ! {
    if let (Some(dp), Some(_cp)) = (
        pac::Peripherals::take(),
        cortex_m::peripheral::Peripherals::take(),
    ) {
        let rcc = dp.RCC.constrain();
        let clocks = rcc.cfgr.use_hse(25.MHz()).sysclk(100.MHz()).hclk(25.MHz()).freeze();
        let mut delay = dp.TIM5.delay_us(&clocks);
        let gpioc = dp.GPIOC.split();
        let mut led = gpioc.pc13.into_push_pull_output();

        loop {
            led.set_high();
            delay.delay_ms(500u16);
            led.set_low();
            delay.delay_ms(500u16);
        }
    } else {
        loop {}
    }
}