Make interrupt module more standard.

- Move typelevel interrupts to a special-purpose mod: `embassy_xx::interrupt::typelevel`.
- Reexport the PAC interrupt enum in `embassy_xx::interrupt`.

This has a few advantages:
- The `embassy_xx::interrupt` module is now more "standard".
  - It works with `cortex-m` functions for manipulating interrupts, for example.
  - It works with RTIC.
- the interrupt enum allows holding value that can be "any interrupt at runtime", this can't be done with typelevel irqs.
- When "const-generics on enums" is stable, we can remove the typelevel interrupts without disruptive changes to `embassy_xx::interrupt`.

2 files changed, 6 insertions, 6 deletions

diff --git a/embassy-stm32/src/usb/mod.rs b/embassy-stm32/src/usb/mod.rs
index fbd1fa823..bee287fe6 100644
--- a/embassy-stm32/src/usb/mod.rs
+++ b/embassy-stm32/src/usb/mod.rs
@@ -1,4 +1,4 @@
-use crate::interrupt::Interrupt;
+use crate::interrupt;
 use crate::rcc::RccPeripheral;
 
 #[cfg(feature = "nightly")]
@@ -13,7 +13,7 @@ pub(crate) mod sealed {
 }
 
 pub trait Instance: sealed::Instance + RccPeripheral + 'static {
-    type Interrupt: Interrupt;
+    type Interrupt: interrupt::typelevel::Interrupt;
 }
 
 // Internal PHY pins
@@ -29,7 +29,7 @@ foreach_interrupt!(
         }
 
         impl Instance for crate::peripherals::$inst {
-            type Interrupt = crate::interrupt::$irq;
+            type Interrupt = crate::interrupt::typelevel::$irq;
         }
     };
 );
diff --git a/embassy-stm32/src/usb/usb.rs b/embassy-stm32/src/usb/usb.rs
index 134107978..7486bd376 100644
--- a/embassy-stm32/src/usb/usb.rs
+++ b/embassy-stm32/src/usb/usb.rs
@@ -14,7 +14,7 @@ use embassy_usb_driver::{
 
 use super::{DmPin, DpPin, Instance};
 use crate::gpio::sealed::AFType;
-use crate::interrupt::Interrupt;
+use crate::interrupt::typelevel::Interrupt;
 use crate::pac::usb::regs;
 use crate::pac::usb::vals::{EpType, Stat};
 use crate::pac::USBRAM;
@@ -26,7 +26,7 @@ pub struct InterruptHandler<T: Instance> {
     _phantom: PhantomData<T>,
 }
 
-impl<T: Instance> interrupt::Handler<T::Interrupt> for InterruptHandler<T> {
+impl<T: Instance> interrupt::typelevel::Handler<T::Interrupt> for InterruptHandler<T> {
     unsafe fn on_interrupt() {
         unsafe {
             let regs = T::regs();
@@ -255,7 +255,7 @@ pub struct Driver<'d, T: Instance> {
 impl<'d, T: Instance> Driver<'d, T> {
     pub fn new(
         _usb: impl Peripheral<P = T> + 'd,
-        _irq: impl interrupt::Binding<T::Interrupt, InterruptHandler<T>> + 'd,
+        _irq: impl interrupt::typelevel::Binding<T::Interrupt, InterruptHandler<T>> + 'd,
         dp: impl Peripheral<P = impl DpPin<T>> + 'd,
         dm: impl Peripheral<P = impl DmPin<T>> + 'd,
     ) -> Self {