stm32f1_hal/
interrupt.rs

1use crate::{Mcu, pac::interrupt};
2use alloc::boxed::Box;
3use core::cell::{Cell, OnceCell};
4
5pub struct Callback {
6    callback: OnceCell<Cell<Box<dyn FnMut()>>>,
7    it_line: interrupt,
8}
9
10unsafe impl Sync for Callback {}
11
12/// # Safety
13///
14/// Sharing it across multiple interrupt callbacks may lead to a data race.
15impl Callback {
16    pub const fn new(it_line: interrupt) -> Self {
17        Self {
18            callback: OnceCell::new(),
19            it_line,
20        }
21    }
22
23    /// Register the callback, and enable the interrupt.
24    /// You can call it only once.
25    pub fn set(&self, mcu: &mut Mcu, callback: impl FnMut() + 'static) {
26        let cb = Cell::new(Box::new(callback));
27        critical_section::with(|_| {
28            assert!(self.callback.set(cb).is_ok());
29        });
30        mcu.nvic.enable(self.it_line, true);
31    }
32
33    pub unsafe fn call(&self) {
34        if let Some(cb) = self.callback.get() {
35            unsafe { (*cb.as_ptr())() }
36        }
37    }
38}
39
40#[macro_export]
41macro_rules! interrupt_handler {
42    ($(
43        ($LINE:ident, $CALLBACK:ident),
44    )+) => {$(
45        pub static $CALLBACK: $crate::interrupt::Callback =
46            $crate::interrupt::Callback::new($crate::pac::interrupt::$LINE);
47
48        #[allow(non_snake_case)]
49        #[interrupt]
50        fn $LINE() {
51            unsafe { $CALLBACK.call() }
52        }
53    )+};
54}
stm32f1_hal/interrupt.rs

stm32f1_hal/
interrupt.rs
