atmega32u4 0.1.3

Low level access to ATmega32U4 registers
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#[doc = r" Macro to override a device specific interrupt handler"]
#[doc = r""]
#[doc = r" # Syntax"]
#[doc = r""]
#[doc = r" ``` ignore"]
#[doc = r" interrupt!("]
#[doc = r"     // Name of the interrupt"]
#[doc = r"     $Name:ident,"]
#[doc = r""]
#[doc = r"     // Path to the interrupt handler (a function)"]
#[doc = r"     $handler:path,"]
#[doc = r""]
#[doc = r"     // Optional, state preserved across invocations of the handler"]
#[doc = r"     state: $State:ty = $initial_state:expr,"]
#[doc = r" );"]
#[doc = r" ```"]
#[doc = r""]
#[doc = r" Where `$Name` must match the name of one of the variants of the [Interrupt]"]
#[doc = r" enum."]
#[doc = r""]
#[doc = r" The handler must have signature `fn()` is no state was associated to it;"]
#[doc = r" otherwise its signature must be `fn(&mut $State)`."]
#[macro_export]
macro_rules! interrupt {
    ($Name:ident, $handler:path,state: $State:ty = $initial_state:expr) => {
        __interrupt_vector! ($Name, {
            static mut STATE: $State = $initial_state;
            let _ = $crate::Interrupt::$Name;
            let f: fn(&mut $State) = $handler;
            f(&mut STATE)
        });
    };
    ($Name:ident, $handler:path) => {
        __interrupt_vector! ($Name, {
            let _ = $crate::Interrupt::$Name;
            let f: fn() = $handler;
            f()
        });
    };
}