def init():
"""Initialises the hardware layer.
The underlying hardware access layer should protect
itself from being called more than once."""
HardwareAccessLayer.init()
def get_last_set_data():
"""Returns the last 'set_path()' values processed by the
underlying access control layer. This method is used by
unit-tests."""
return HardwareAccessLayer.get_last_set_path_data()
def red_amber(path):
"""Set the lights for the named path to red-amber."""
HardwareAccessLayer.set_path(path, 0, 1)
def amber(path):
"""Set the lights for the named path to amber."""
HardwareAccessLayer.set_path(path, 1, 0)
def green(path):
"""Set the lights for the named path green."""
HardwareAccessLayer.set_path(path, 1, 1)
def red(path):
"""Set the lights for the named path to red."""
HardwareAccessLayer.set_path(path, 0, 0)
def num_paths():
"""Returns the number of addressable paths."""
return HardwareAccessLayer.num_paths()
