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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import asyncio
import contextlib
from typing import Tuple
from typing import Set
from typing import Generator
from typing import Optional
from RPi import GPIO
from .logging import get_logger
from . import aiotools
# =====
@contextlib.contextmanager
def bcm() -> Generator[None, None, None]:
logger = get_logger(2)
GPIO.setmode(GPIO.BCM)
logger.info("Configured GPIO mode as BCM")
try:
yield
finally:
GPIO.cleanup()
logger.info("GPIO cleaned")
def set_output(pin: int, initial: Optional[bool]) -> int:
assert pin >= 0, pin
GPIO.setup(pin, GPIO.OUT, initial=initial)
return pin
def set_input(pin: int) -> int:
assert pin >= 0, pin
GPIO.setup(pin, GPIO.IN)
return pin
def read(pin: int) -> bool:
assert pin >= 0, pin
return bool(GPIO.input(pin))
def write(pin: int, state: bool) -> None:
assert pin >= 0, pin
GPIO.output(pin, state)
class BatchReader:
def __init__(
self,
pins: Set[int],
interval: float,
notifier: aiotools.AioNotifier,
) -> None:
self.__pins = sorted(pins)
self.__interval = interval
self.__notifier = notifier
self.__state = {pin: read(pin) for pin in self.__pins}
self.__flags: Tuple[Optional[bool], ...] = (None,) * len(self.__pins)
def get(self, pin: int) -> bool:
return self.__state[pin]
async def poll(self) -> None:
if not self.__pins:
await aiotools.wait_infinite()
else:
while True:
flags = tuple(map(read, self.__pins))
if flags != self.__flags:
self.__flags = flags
self.__state = dict(zip(self.__pins, flags))
await self.__notifier.notify()
await asyncio.sleep(self.__interval)
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