View Source Circuits.GPIO.Backend behaviour (circuits_gpio v2.0.0-pre.0)
Backends provide the connection to the real or virtual GPIO controllers
Link to this section Summary
Link to this section Callbacks
@callback info() :: map()
Return information about this backend
@callback open( pin_spec :: Circuits.GPIO.pin_spec(), direction :: Circuits.GPIO.pin_direction(), options :: Circuits.GPIO.open_options() ) :: {:ok, Circuits.GPIO.Handle.t()} | {:error, atom()}
Open one or more GPIOs
pin_spec
should be a valid GPIO pin specification on the system and direction
should be :input
or :output
. If opening as an output, then be sure to set
the :initial_value
option if you need the set to be glitch free.
Options:
- :initial_value - Set to
:not_set
,0
or1
if this is an output.:not_set
is the default. - :pull_mode - Set to
:not_set
,:pullup
,:pulldown
, or:none
for an input pin.:not_set
is the default.