Improves code quality by adding MBED_ASSERT to UserAllocatedEvent::delay
and UserAllocatedEvent::period function. This prevent changing already posted event.
When a Doxygen group has been defined (created), all its needed to add
documentation to that group is `\addtogroup`. Since all the information
about the group is preserved, it is not necessary to mention the group
hierarchy again with `\ingroup`. This PR removes unnecessary Doxygen lines
across the `drivers`, `events`, `platform` and `rtos` directories.
It also ensures that new groups are created with `\defgroup` once and
referenced with `\addtogroup` whenever documentation needs to be added to
an existing group.
UserAllocatedEvent provides mechanism for event posting and dispatching without
utilization of queue internal memory. UserAllocatedEvent embeds all underlying
event data and doesn't require any memory allocation while posting and dispatching.
All of these makes it cannot fail due to memory exhaustion while posting.
Maciej Bocianski
Martin Kojtal
Hugues Kamba