Deferred call mechanism.
This is a tool to allow chip peripherals to schedule "interrupts" in the chip scheduler if the hardware doesn't support interrupts where they are needed.
AtomicUsize with no CAS operations that works on targets that have "no atomic support" according to their specification. This makes it work on thumbv6 platforms.
Represents a way to generate an asynchronous call without a hardware interrupt. Supports up to 32 possible deferrable tasks.
Are there any pending