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package com.diozero.api;
/*
* #%L
* Organisation: mattjlewis
* Project: Device I/O Zero - Core
* Filename: DigitalInputDevice.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2017 mattjlewis
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import org.pmw.tinylog.Logger;
import com.diozero.internal.provider.GpioDeviceFactoryInterface;
import com.diozero.internal.provider.GpioDigitalInputDeviceInterface;
import com.diozero.util.DeviceFactoryHelper;
import com.diozero.util.RuntimeIOException;
/**
* Represents a generic digital input device.
*/
public class DigitalInputDevice extends AbstractDigitalInputDevice {
protected GpioDigitalInputDeviceInterface device;
private GpioPullUpDown pud;
private GpioEventTrigger trigger;
/**
* @param gpio
* GPIO to which the device is connected.
* @throws RuntimeIOException
* If an I/O error occurs.
*/
public DigitalInputDevice(int gpio) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, GpioPullUpDown.NONE, GpioEventTrigger.BOTH);
}
/**
* @param gpio
* GPIO to which the device is connected.
* @param pud
* Pull up/down configuration, values: NONE, PULL_UP, PULL_DOWN.
* @param trigger
* Event trigger configuration, values: NONE, RISING, FALLING,
* BOTH.
* @throws RuntimeIOException
* If an I/O error occurs.
*/
public DigitalInputDevice(int gpio, GpioPullUpDown pud, GpioEventTrigger trigger) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, pud, trigger);
}
/**
* @param deviceFactory
* Device factory to use to provision this digital input device.
* @param gpio
* GPIO to which the device is connected.
* @param pud
* Pull up/down configuration, values: NONE, PULL_UP, PULL_DOWN.
* @param trigger
* Event trigger configuration, values: NONE, RISING, FALLING,
* BOTH.
* @throws RuntimeIOException
* If an I/O error occurs.
*/
public DigitalInputDevice(GpioDeviceFactoryInterface deviceFactory, int gpio, GpioPullUpDown pud,
GpioEventTrigger trigger) throws RuntimeIOException {
super(gpio, pud != GpioPullUpDown.PULL_UP);
this.device = deviceFactory.provisionDigitalInputDevice(gpio, pud, trigger);
this.pud = pud;
this.trigger = trigger;
}
@Override
public void close() {
Logger.debug("close()");
device.close();
}
/**
* Get pull up / down configuration.
*
* @return Pull up / down configuration.
*/
public GpioPullUpDown getPullUpDown() {
return pud;
}
/**
* Get event trigger configuration.
*
* @return Event trigger configuration.
*/
public GpioEventTrigger getTrigger() {
return trigger;
}
/**
* Read the current underlying state of the input pin. Does not factor in
* active high logic.
*
* @return Device state.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
@Override
public boolean getValue() throws RuntimeIOException {
return device.getValue();
}
/**
* Read the current on/off state for this device taking into account the
* pull up / down configuration. If the input is pulled up
* {@code isActive()} will return {@code true} when when the value is
* {@code false}.
*
* @return Device active state.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public boolean isActive() throws RuntimeIOException {
return device.getValue() == activeHigh;
}
@Override
protected void setListener() {
device.setListener(this);
}
@Override
protected void removeListener() {
device.removeListener();
}
}