Macro impl_simple_pwm

macro_rules! impl_simple_pwm {
    (
        $(#[$timer_pwm_attr:meta])*
        pub struct $TimerPwm:ident {
            timer: $TIMER:ty,
            init: |$init_timer:ident, $prescaler:ident| $init_block:block,
            pins: {$(
                $PXi:ident: {
                    ocr: $ocr:ident,
                    $into_pwm:ident: |$pin_timer:ident| if enable
                        $pin_enable_block:block else $pin_disable_block:block,
                },
            )+},
        }
    ) => { ... };
}