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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.gpio.internal.handler;
  14
  15 import java.util.Date;
  16 import java.util.concurrent.ScheduledExecutorService;
  17 import java.util.concurrent.TimeUnit;
  18 import java.util.function.Consumer;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.openhab.binding.gpio.internal.NoGpioIdException;
  22 import org.openhab.binding.gpio.internal.configuration.GPIOInputConfiguration;
  23 import org.openhab.core.library.types.OnOffType;
  24 import org.openhab.core.types.Command;
  25 import org.openhab.core.types.RefreshType;
  26 import org.openhab.core.types.State;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 import eu.xeli.jpigpio.GPIO;
  31 import eu.xeli.jpigpio.JPigpio;
  32 import eu.xeli.jpigpio.PigpioException;
  33
  34 /**
  35  * Thing Handler for digital GPIO inputs.
  36  *
  37  * @author Nils Bauer - Initial contribution
  38  * @author Jan N. Klug - Channel redesign
  39  */
  40 @NonNullByDefault
  41 public class PigpioDigitalInputHandler implements ChannelHandler {
  42
  43     private final Logger logger = LoggerFactory.getLogger(PigpioDigitalInputHandler.class);
  44     private Date lastChanged = new Date();
  45
  46     private final GPIOInputConfiguration configuration;
  47     private final GPIO gpio;
  48     private final Consumer<State> updateStatus;
  49
  50     public PigpioDigitalInputHandler(GPIOInputConfiguration configuration, JPigpio jPigpio,
  51             ScheduledExecutorService scheduler, Consumer<State> updateStatus)
  52             throws PigpioException, NoGpioIdException {
  53         this.configuration = configuration;
  54         this.updateStatus = updateStatus;
  55         Integer gpioId = configuration.gpioId;
  56         if (gpioId == null) {
  57             throw new NoGpioIdException();
  58         }
  59         gpio = new GPIO(jPigpio, gpioId, 1);
  60         jPigpio.gpioSetAlertFunc(gpio.getPin(), (gpio, level, tick) -> {
  61             lastChanged = new Date();
  62             Date thisChange = new Date();
  63             scheduler.schedule(() -> afterDebounce(thisChange), configuration.debouncingTime, TimeUnit.MILLISECONDS);
  64         });
  65     }
  66
  67     private void afterDebounce(Date thisChange) {
  68         try {
  69             // Check if value changed over time
  70             if (!thisChange.before(lastChanged)) {
  71                 updateStatus.accept(OnOffType.from(configuration.invert != gpio.getValue()));
  72             }
  73         } catch (PigpioException e) {
  74             logger.warn("Unknown pigpio exception", e);
  75         }
  76     }
  77
  78     @Override
  79     public void handleCommand(Command command) {
  80         if (command instanceof RefreshType) {
  81             try {
  82                 updateStatus.accept(OnOffType.from(configuration.invert != gpio.getValue()));
  83             } catch (PigpioException e) {
  84                 logger.warn("Unknown pigpio exception while handling Refresh", e);
  85             }
  86         }
  87     }
  88 }