PhoenixPilot/PhoenixPilot — pull request #5 by peabody124 (2012-11-11 01:31:02+00:00)
Title: telemetry: stop registering periodic events for non-periodic UAVOs

Telemetry module was iterating over all UAVOs including
meta UAVOs and creating a periodic event item for each
object. These items cost us about 32 bytes for each list
item.

This is wasteful for two main reasons. First, meta UAVOs can't
meaningfully have periodic updates so excluding them entirely
makes sense. That halves the number of objects in this list since
there is one meta object for every data object. This is worth
about 500 bytes of RAM on CC.

Second, about half of the remaining UAVOs are not periodic by
default so they're wasting memory unless someone happens to want
to make them periodic at runtime. This is worth another 450 bytes
of RAM on CC.

So, objects that are configured as periodic during board init will
support all of the periodic config at runtime. Objects that are
*not* periodic during board init can only be made periodic on the
next boot.

Each object that you make periodic during init will cost you an
extra 32 bytes of RAM.

With erased settings, free RAM comparison for CC is:
Before: 2736 bytes free
After: 4048 bytes free

Total RAM savings with this update is 1312 bytes!