Function avr_alloc_irq 

pub unsafe extern "C" fn avr_alloc_irq(
    pool: *mut avr_irq_pool_t,
    base: u32,
    count: u32,
    names: *mut *const c_char,
) -> *mut avr_irq_t

! allocates ‘count’ IRQs, initializes their “irq” starting from ‘base’ and increment