We can't register hooks from constructors, because there is no guaranteed order
in which the objects will be created. So it may well happen that the Keyboardio
object gets created later, and zeroes out everything. Or it gets created first,
and registers the default handler as the first one, making all the others
pointless.
Instead, we create a KeyboardioPlugin class, that has a `begin` method. This is
responsible for setting up the hooks and whatnot. To make things simpler (for
some values of simple), a `Keyboardio.use` method is introduced, which, when
given a NULL-terminated list of plugin object pointers, will call the begin
method of each.
All LED effects and other plugins that used to register a static object now use
an extern, and had their initialization moved to the `begin` method.
The end result is not the nicest thing, but it works. We can try figuring out
something nicer later.
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Recreate LEDControl as a class with pluggable parts, similar in vein to
the event handler and loop hooks. Except in this case, only the current
effect runs at any one time, the current one.
All existing effects were separated out into plugins, and the default
firmware example was updated too. All of them were pretty trivial, save
the special NumLock effect: that one also installs a loop hook, and
switches the LED mode if need be. Its setup function also skips to the
next effect, if the mode was selected manually.
Behaviour should be the same as before, but LED effects are now
pluggable, at the cost of some code and data size increase.
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Gergely Nagy