102 lines
2.6 KiB
Rust
102 lines
2.6 KiB
Rust
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#![no_std]
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#![no_main]
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use defmt_rtt as _;
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use panic_probe as _;
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use core::cell::RefCell;
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use cortex_m::interrupt::Mutex;
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use cortex_m::peripheral::NVIC;
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use cortex_m_rt::entry;
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use embassy_stm32::{
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gpio::{Input, Level, Output, Pin, Pull, Speed},
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interrupt, pac,
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peripherals::{PB14, PC13},
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};
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static BUTTON: Mutex<RefCell<Option<Input<'static, PC13>>>> = Mutex::new(RefCell::new(None));
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static LED: Mutex<RefCell<Option<Output<'static, PB14>>>> = Mutex::new(RefCell::new(None));
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#[entry]
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fn main() -> ! {
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let p = embassy_stm32::init(Default::default());
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let led = Output::new(p.PB14, Level::Low, Speed::Low);
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let mut button = Input::new(p.PC13, Pull::Up);
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cortex_m::interrupt::free(|cs| unsafe {
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enable_interrupt(&mut button);
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LED.borrow(cs).borrow_mut().replace(led);
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BUTTON.borrow(cs).borrow_mut().replace(button);
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NVIC::unmask(pac::Interrupt::EXTI15_10);
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});
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loop {
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cortex_m::asm::wfe();
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}
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}
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#[interrupt]
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fn EXTI15_10() {
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cortex_m::interrupt::free(|cs| {
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let mut button = BUTTON.borrow(cs).borrow_mut();
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let button = button.as_mut().unwrap();
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let mut led = LED.borrow(cs).borrow_mut();
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let led = led.as_mut().unwrap();
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if check_interrupt(button) {
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if button.is_low() {
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led.set_high();
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} else {
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led.set_low();
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}
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}
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clear_interrupt(button);
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});
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}
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//
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//
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//
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//
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//
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//
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// "Hidden" HAL-like methods for doing interrupts with embassy. Hardcode pin just to give audience an idea of what it looks like
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const PORT: u8 = 2;
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const PIN: usize = 13;
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fn check_interrupt<P: Pin>(_pin: &mut Input<'static, P>) -> bool {
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let exti = pac::EXTI;
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unsafe {
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let pin = PIN;
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let lines = exti.pr(0).read();
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lines.line(pin)
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}
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}
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fn clear_interrupt<P: Pin>(_pin: &mut Input<'static, P>) {
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let exti = pac::EXTI;
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unsafe {
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let pin = PIN;
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let mut lines = exti.pr(0).read();
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lines.set_line(pin, true);
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exti.pr(0).write_value(lines);
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}
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}
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fn enable_interrupt<P: Pin>(_pin: &mut Input<'static, P>) {
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cortex_m::interrupt::free(|_| unsafe {
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let rcc = pac::RCC;
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rcc.apb2enr().modify(|w| w.set_syscfgen(true));
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let port = PORT;
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let pin = PIN;
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let syscfg = pac::SYSCFG;
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let exti = pac::EXTI;
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syscfg.exticr(pin / 4).modify(|w| w.set_exti(pin % 4, port));
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exti.imr(0).modify(|w| w.set_line(pin, true));
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exti.rtsr(0).modify(|w| w.set_line(pin, true));
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exti.ftsr(0).modify(|w| w.set_line(pin, true));
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});
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}
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