Commit Graph

6 Commits

Author SHA1 Message Date
Damien George 6df7b2f2fe extmod/machine_signal: Change VLA to use new scoped allocation API. 2017-12-11 13:49:09 +11:00
Damien George 653a0c2d71 extmod/machine_signal: Fix parsing of invert arg when Pin is first arg. 2017-07-26 12:51:46 +10:00
Damien George 61616e84ce extmod/machine_signal: Rename "inverted" arg to "invert", it's shorter.
A shorter name takes less code size, less room in scripts and is faster to
type at the REPL.

Tests and HW-API examples are updated to reflect the change.
2017-04-15 21:01:47 +03:00
Paul Sokolovsky 605ff91efd extmod/machine_signal: Support all Pin's arguments to the constructor.
This implements the orginal idea is that Signal is a subclass of Pin, and
thus can accept all the same argument as Pin, and additionally, "inverted"
param. On the practical side, it allows to avoid many enclosed parenses for
a typical declararion, e.g. for Zephyr:

Signal(Pin(("GPIO_0", 1))).

Of course, passing a Pin to Signal constructor is still supported and is the
most generic form (e.g. Unix port will only support such form, as it doesn't
have "builtin" Pins), what's introduces here is just practical readability
optimization.

"value" kwarg is treated as applying to a Signal (i.e. accounts for possible
inversion).
2017-04-11 00:12:20 +03:00
Paul Sokolovsky 181f7d1450 extmod/machine_signal: Implement Signal .on() and .off() methods.
Each method asserts and deasserts signal respectively. They are equivalent
to .value(1) and .value(0) but conceptually simpler (and may help to avoid
confusion with inverted signals, where "asserted" state means logical 0
output).
2017-02-08 11:14:23 +03:00
Paul Sokolovsky 7a7516d40d extmod/machine_signal: Implement "signal" abstraction for machine module.
A signal is like a pin, but ca also be inverted (active low). As such, it
abstracts properties of various physical devices, like LEDs, buttons,
relays, buzzers, etc. To instantiate a Signal:

pin = machine.Pin(...)
signal = machine.Signal(pin, inverted=True)

signal has the same .value() and __call__() methods as a pin.
2017-01-29 18:57:36 +03:00