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#![no_std] | |
#![no_main] | |
use cortex_m_rt::entry; | |
use cortex_m_semihosting::hprintln; | |
use panic_semihosting as _; | |
use stm32f4::stm32f401::Peripherals; | |
fn init_board() -> Peripherals { | |
// LED on PA5 | |
// Button on PC13 | |
let p = Peripherals::take().unwrap(); | |
let rcc = &p.RCC; | |
let pa = &p.GPIOA; | |
let pc = &p.GPIOC; | |
rcc.ahb1enr | |
.modify(|_, w| w.gpioaen().enabled().gpiocen().enabled()); | |
pa.moder.modify(|_, w| w.moder5().output()); | |
pc.moder.modify(|_, w| w.moder13().input()); | |
p | |
} | |
fn toggle_led(p: &Peripherals) { | |
p.GPIOA.odr.modify(|r, w| w.odr5().bit(!r.odr5().bit())); | |
} | |
#[entry] | |
fn main() -> ! { | |
hprintln!("Hello, world!"); | |
let p = init_board(); | |
toggle_led(&p); | |
toggle_led(&p); | |
toggle_led(&p); | |
toggle_led(&p); | |
hprintln!("Goodbye!"); | |
loop {} | |
} |
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