This commit is a fairly major piece of work that abstracts all pin
operations (function, state, edge detection, PWM, etc.) into a base
"Pin" class which is then used by input/output/composite devices to
perform all required configuration.
The idea is to pave the way for I2C based IO extenders which can present
additional GPIO ports with similar capabilities to the Pi's "native"
GPIO ports. As a bonus it also abstracts away the reliance on the
RPi.GPIO library to allow alternative pin implementations (e.g. using
RPIO to take advantage of DMA based PWM), or even pure Python
implementations.
The prototypes in the docs are rigged to make out the first parameter as
mandatory (as it effectively is); however this does mean you've got to
remember to update the prototype when you modify it in the code! :)
Knew I'd missed some patches to the docs! This re-applies the
aforementioned doc patches and also fixes the last RGBLED example (which
was subtly incorrect in the original docs)
Change parent of PWMOutputDevice to OutputDevice and implement blink to
maintain compatibility. The version of blink implemented here is
slightly extended to include functionality like Explorer HAT's "pulse".
The parameter defaults behave identically to OutputDevice's blink but
can be adjusted to have the device smoothly fade in and out.
Something fishy going on with the Markdown for the code examples in the
Notes page. Might be down to the indentation of the list item's content?
The vim markdown parser seems to think so anyway; let's see what
pythonhosted.org says ...
Big push on getting the docs cleaned up before 1.0. Proper wrapping of
everything so it's decently viewable from the command line (or as
decently viewable as markdown can be - the tables will never look great
from the command line).
Only one code change in this PR: rename bouncetime to bounce_time
(everything else is PEP-8, so this probably should be too) and change
its units to seconds from milliseconds (again, all other durations in
the library are in seconds, so it feels inconsistent that this one
isn't; for the sake of those who won't read the docs - which is most
people - I figure consistency helps with guessing!).
