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   1 /**
   2  * Copyright (c) 2010-2023 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.GPIOBindingConstants;
  22 import org.openhab.binding.gpio.internal.InvalidPullUpDownException;
  23 import org.openhab.binding.gpio.internal.NoGpioIdException;
  24 import org.openhab.binding.gpio.internal.configuration.GPIOInputConfiguration;
  25 import org.openhab.core.library.types.OnOffType;
  26 import org.openhab.core.types.Command;
  27 import org.openhab.core.types.RefreshType;
  28 import org.openhab.core.types.State;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 import eu.xeli.jpigpio.GPIO;
  33 import eu.xeli.jpigpio.JPigpio;
  34 import eu.xeli.jpigpio.PigpioException;
  35
  36 /**
  37  * Thing Handler for digital GPIO inputs.
  38  *
  39  * @author Nils Bauer - Initial contribution
  40  * @author Jan N. Klug - Channel redesign
  41  * @author Martin Dagarin - Pull Up/Down GPIO pin
  42  */
  43 @NonNullByDefault
  44 public class PigpioDigitalInputHandler implements ChannelHandler {
  45
  46     private final Logger logger = LoggerFactory.getLogger(PigpioDigitalInputHandler.class);
  47     private Date lastChanged = new Date();
  48
  49     private final GPIOInputConfiguration configuration;
  50     private final GPIO gpio;
  51     private final Consumer<State> updateStatus;
  52
  53     public PigpioDigitalInputHandler(GPIOInputConfiguration configuration, JPigpio jPigpio,
  54             ScheduledExecutorService scheduler, Consumer<State> updateStatus)
  55             throws PigpioException, InvalidPullUpDownException, NoGpioIdException {
  56         this.configuration = configuration;
  57         this.updateStatus = updateStatus;
  58         Integer gpioId = configuration.gpioId;
  59         if (gpioId == null) {
  60             throw new NoGpioIdException();
  61         }
  62         Integer pullupdown = JPigpio.PI_PUD_OFF;
  63         String pullupdownStr = configuration.pullupdown.toUpperCase();
  64         if (pullupdownStr.equals(GPIOBindingConstants.PUD_DOWN)) {
  65             pullupdown = JPigpio.PI_PUD_DOWN;
  66         } else if (pullupdownStr.equals(GPIOBindingConstants.PUD_UP)) {
  67             pullupdown = JPigpio.PI_PUD_UP;
  68         } else {
  69             if (!pullupdownStr.equals(GPIOBindingConstants.PUD_OFF)) {
  70                 throw new InvalidPullUpDownException();
  71             }
  72         }
  73         gpio = new GPIO(jPigpio, gpioId, JPigpio.PI_INPUT);
  74         jPigpio.gpioSetAlertFunc(gpio.getPin(), (gpio, level, tick) -> {
  75             lastChanged = new Date();
  76             Date thisChange = new Date();
  77             scheduler.schedule(() -> afterDebounce(thisChange), configuration.debouncingTime, TimeUnit.MILLISECONDS);
  78         });
  79         jPigpio.gpioSetPullUpDown(gpio.getPin(), pullupdown);
  80     }
  81
  82     private void afterDebounce(Date thisChange) {
  83         try {
  84             // Check if value changed over time
  85             if (!thisChange.before(lastChanged)) {
  86                 updateStatus.accept(OnOffType.from(configuration.invert != gpio.getValue()));
  87             }
  88         } catch (PigpioException e) {
  89             logger.warn("Unknown pigpio exception", e);
  90         }
  91     }
  92
  93     @Override
  94     public void handleCommand(Command command) {
  95         if (command instanceof RefreshType) {
  96             try {
  97                 updateStatus.accept(OnOffType.from(configuration.invert != gpio.getValue()));
  98             } catch (PigpioException e) {
  99                 logger.warn("Unknown pigpio exception while handling Refresh", e);
 100             }
 101         }
 102     }
 103 }