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Example interrupt API
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| [entry] | |
| fn main() -> ! { | |
| let p = cortex_m::Peripherals::take().unwrap(); | |
| let interrupts = Interrupts::new(p.NVIC); | |
| let a: u32 = 5; | |
| let b: u32 = 6; | |
| let c: u32 = 7; | |
| let uarte = interrupts.USART0.enable(&mut || { | |
| let a2 = a; // Copy type | |
| let b2 = &b; // Immutable reference | |
| let c2 = &mut c; //Mutable reference | |
| }); | |
| //uarte now contains a mutable reference to the closure | |
| // some time later... | |
| let uartd = uarte.disable(); // Consumes uarte | |
| } | |
| //////////////////// | |
| // Implementation | |
| /////////////////// | |
| use std::mem::{MaybeUninit, transmute}; | |
| use std::marker::PhantomData; | |
| static mut USART0_HANDLER: MaybeUninit<&'static mut dyn FnMut()> = MaybeUninit::uninit(); | |
| struct DisabledUSART0; | |
| impl DisabledUSART0 { | |
| fn enable<'a>(self, cb: &'a mut dyn FnMut()) -> EnabledUSART0<'a> { | |
| USART0_HANDLER.write(transmute::<&'a mut dyn FnMut(), &'static mut dyn FnMut()>(cb)); | |
| // Enable USART0 in the NVIC | |
| EnabledUSART0 { | |
| _marker: PhantomData | |
| } | |
| } | |
| } | |
| struct EnabledUSART0<'a> { | |
| _marker: std::marker::PhantomData<&'a mut dyn FnMut> | |
| } | |
| impl<'a> EnabledUSART0<'a> { | |
| fn disable(self) -> DisabledUSART0 { | |
| // Disable USART0 in the NVIC | |
| DisabledUSART0 | |
| } | |
| } | |
| #[no_mangle] | |
| fn USART0() { | |
| unsafe { &mut *USART0_HANDLER.as_mut_ptr() }(); | |
| } |
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