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package com.diozero.api;
/*-
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: DigitalOutputDevice.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 - 2020 diozero
* %%
* 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.tinylog.Logger;
import com.diozero.internal.provider.GpioDeviceFactoryInterface;
import com.diozero.internal.provider.GpioDigitalOutputDeviceInterface;
import com.diozero.util.DeviceFactoryHelper;
import com.diozero.util.DioZeroScheduler;
import com.diozero.util.RuntimeIOException;
import com.diozero.util.SleepUtil;
/**
* Provides generic digital (on/off) output control with support for active high
* and low logic.
*/
public class DigitalOutputDevice extends GpioDevice implements OutputDeviceInterface {
public static final int INFINITE_ITERATIONS = -1;
private boolean activeHigh;
private boolean running;
private GpioDigitalOutputDeviceInterface device;
/**
* Defaults to active high logic, initial value is off.
*
* @param gpio
* GPIO to which the output device is connected.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public DigitalOutputDevice(int gpio) throws RuntimeIOException {
this(gpio, true, false);
}
/**
* @param gpio
* GPIO to which the output device is connected.
* @param activeHigh
* If true then setting the value to true will turn on the
* connected device.
* @param initialValue
* Initial output value.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public DigitalOutputDevice(int gpio, boolean activeHigh, boolean initialValue) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, activeHigh, initialValue);
}
/**
* @param deviceFactory
* Device factory to use to construct the device.
* @param gpio
* GPIO to which the output device is connected.
* @param activeHigh
* If true then setting the value to true will turn on the
* connected device.
* @param initialValue
* Initial output value.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public DigitalOutputDevice(GpioDeviceFactoryInterface deviceFactory, int gpio, boolean activeHigh,
boolean initialValue) throws RuntimeIOException {
super(gpio);
this.device = deviceFactory.provisionDigitalOutputDevice(gpio, activeHigh & initialValue);
this.activeHigh = activeHigh;
}
@Override
public void close() {
Logger.trace("close()");
setOn(false);
device.close();
}
private void onOffLoop(float onTime, float offTime, int n, Action stopAction) throws RuntimeIOException {
running = true;
if (n > 0) {
for (int i = 0; i < n && running; i++) {
onOff(onTime, offTime);
}
} else if (n == INFINITE_ITERATIONS) {
while (running) {
onOff(onTime, offTime);
}
}
if (stopAction != null) {
stopAction.action();
}
}
private void onOff(float onTime, float offTime) throws RuntimeIOException {
if (!running) {
return;
}
setValueUnsafe(activeHigh);
SleepUtil.sleepSeconds(onTime);
if (!running) {
return;
}
setValueUnsafe(!activeHigh);
SleepUtil.sleepSeconds(offTime);
}
private void stopOnOffLoop() {
// TODO Interrupt any background threads?
running = false;
}
// Exposed operations
/**
* Turn on the device.
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void on() throws RuntimeIOException {
stopOnOffLoop();
setValueUnsafe(activeHigh);
}
/**
* Turn off the device.
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void off() throws RuntimeIOException {
stopOnOffLoop();
setValueUnsafe(!activeHigh);
}
/**
* Toggle the state of the device.
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void toggle() throws RuntimeIOException {
stopOnOffLoop();
setValueUnsafe(!device.getValue());
}
/**
* Get the device on / off status.
*
* @return Returns true if the device is currently on.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public boolean isOn() throws RuntimeIOException {
return activeHigh == device.getValue();
}
/**
* Turn the device on or off.
*
* @param on
* New on/off value.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void setOn(boolean on) throws RuntimeIOException {
stopOnOffLoop();
setValueUnsafe(activeHigh & on);
}
/**
* Unsafe operation that has no synchronisation checks and doesn't compensate
* for active low logic. Included primarily for performance tests.
*
* @param value
* The new value
* @throws RuntimeIOException
* If an I/O error occurs
*/
public void setValueUnsafe(boolean value) throws RuntimeIOException {
device.setValue(value);
}
@Override
public void setValue(float value) {
setValueUnsafe(value != 0);
}
/**
* Toggle the device on-off.
*
* @param onTime
* On time in seconds.
* @param offTime
* Off time in seconds.
* @param n
* Number of iterations. Set to <0 to blink indefinitely.
* @param background
* If true start a background thread to control the blink and
* return immediately. If false, only return once the blink
* iterations have finished.
* @param stopAction
* Action to perform when the loop finishes
* @throws RuntimeIOException
* If an I/O error occurs
*/
public void onOffLoop(float onTime, float offTime, int n, boolean background, Action stopAction) throws RuntimeIOException {
stopOnOffLoop();
if (background) {
DioZeroScheduler.getDaemonInstance().execute(() -> onOffLoop(onTime, offTime, n, stopAction));
} else {
onOffLoop(onTime, offTime, n, stopAction);
}
}
}
