def __init__(self, invoker, settings, env, callback=None, end_callback=None,
recorder=None):
EventProducer.__init__(self, invoker)
self.callback = callback
self.end_callback = end_callback
self.st = settings
self.env = env
self.recorder = recorder
def _update_buttons(self, rega, regb):
"""
compares old state of the buttons with the state that is read from registers ``rega`` and
``regb``. Typical values for these arguments are GPIO or INTCAP registers
"""
with self.lock:
now = time.time()
values={}
for addr in self.mcp.keys():
ra=self.mcp[addr].i2c.readU8(rega)
rb=self.mcp[addr].i2c.readU8(regb)
res=(rb<<8)+ra
#some trivial asserts, can/should be deleted
assert(rb>=0)
assert(rb<=255)
assert(ra>=0)
assert(ra<=255)
assert(res>=0)
assert(res<2**16)
values[addr]=res
binary = {}
for addr, val in values.items():
# converts val to binary digits
_str='{0:0=16b}'.format(val)
assert(len(_str)==16)
#new state of the keys
binary[addr] = [int(d) for d in _str]
for key in self.keyboard.keys:
addr, pin = key.key_object
new_value = (binary[addr][15-pin] == 0)
#if actual state of the key is different from the old one, and if bouncetime
#condition allows it, fire 'up' or 'down' event on the given key
if new_value != key.pressed and now - key._last_change >= self.bouncetime:
key._last_change = now
key.pressed = new_value
updown = 'down' if key.pressed else 'up'
EventProducer.fire_event(key, key, updown)
def __init__(self, invoker, settings, callback=None, end_callback=None):
EventProducer.__init__(self, invoker)
self.callback = callback
self.end_callback = end_callback
self.st = settings