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package com.diozero.api;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: PwmOutputDevice.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 java.util.concurrent.atomic.AtomicBoolean;
import org.tinylog.Logger;
import com.diozero.internal.provider.PwmOutputDeviceFactoryInterface;
import com.diozero.internal.provider.PwmOutputDeviceInterface;
import com.diozero.util.DeviceFactoryHelper;
import com.diozero.util.DioZeroScheduler;
import com.diozero.util.RuntimeIOException;
import com.diozero.util.SleepUtil;
/**
* Provide generic
* Pulse Width
* Modulation (PWM) output control. Note the following Raspberry Pi BCM GPIO
* pins provide hardware PWM support: 12 (phys 32, wPi 26), 13 (phys 33, wPi
* 23), 18 (phys 12, wPi 1), 19 (phys 35, wPi 24) Any other pin will revert to
* software controlled PWM.
*/
public class PwmOutputDevice extends GpioDevice implements OutputDeviceInterface {
private static final int DEFAULT_PWM_FREQUENCY = 50;
public static final int INFINITE_ITERATIONS = -1;
private PwmOutputDeviceInterface device;
private AtomicBoolean running;
private Thread backgroundThread;
/**
* @param gpio
* GPIO to which the output device is connected.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public PwmOutputDevice(int gpio) throws RuntimeIOException {
this(gpio, 0);
}
/**
* @param gpio
* GPIO to which the output device is connected.
* @param initialValue
* Initial output value (0..1).
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public PwmOutputDevice(int gpio, float initialValue) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, initialValue);
}
/**
* @param gpio
* GPIO to which the output device is connected.
* @param initialValue
* Initial output value (0..1).
* @param pwmFrequency
* PWM frequency (Hz).
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public PwmOutputDevice(int gpio, int pwmFrequency, float initialValue) throws RuntimeIOException {
this(DeviceFactoryHelper.getNativeDeviceFactory(), gpio, pwmFrequency, initialValue);
}
/**
* @param pwmDeviceFactory
* Device factory to use to provision this device.
* @param gpio
* GPIO to which the output device is connected.
* @param initialValue
* Initial output value (0..1).
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public PwmOutputDevice(PwmOutputDeviceFactoryInterface pwmDeviceFactory, int gpio, float initialValue)
throws RuntimeIOException {
this(pwmDeviceFactory, gpio, DEFAULT_PWM_FREQUENCY, initialValue);
}
/**
* @param pwmDeviceFactory
* Device factory to use to provision this device.
* @param gpio
* GPIO to which the output device is connected.
* @param pwmFrequency
* PWM frequency (Hz).
* @param initialValue
* Initial output value (0..1).
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public PwmOutputDevice(PwmOutputDeviceFactoryInterface pwmDeviceFactory, int gpio, int pwmFrequency, float initialValue)
throws RuntimeIOException {
super(gpio);
running = new AtomicBoolean();
this.device = pwmDeviceFactory.provisionPwmOutputDevice(gpio, pwmFrequency, initialValue);
}
@Override
public void close() {
Logger.trace("close()");
if (running.get()) {
stopLoops();
Logger.debug("Interrupting background thread " + backgroundThread.getName());
backgroundThread.interrupt();
}
Logger.trace("Setting value to 0");
try {
device.setValue(0);
} catch (RuntimeIOException e) {
}
device.close();
Logger.trace("device closed");
}
protected void onOffLoop(float onTime, float offTime, int n, boolean background) throws RuntimeIOException {
stopLoops();
if (background) {
DioZeroScheduler.getDaemonInstance().execute(() -> {
backgroundThread = Thread.currentThread();
onOffLoop(onTime, offTime, n);
Logger.debug("Background on-off loop finished");
});
} else {
onOffLoop(onTime, offTime, n);
}
}
private void onOffLoop(float onTime, float offTime, int n) throws RuntimeIOException {
if (n > 0) {
running.getAndSet(true);
for (int i = 0; i < n && running.get(); i++) {
onOff(onTime, offTime);
}
running.getAndSet(false);
} else if (n == INFINITE_ITERATIONS) {
running.getAndSet(true);
while (running.get()) {
onOff(onTime, offTime);
}
}
}
protected void fadeInOutLoop(float fadeTime, int steps, int iterations, boolean background)
throws RuntimeIOException {
stopLoops();
if (background) {
DioZeroScheduler.getDaemonInstance().execute(() -> {
backgroundThread = Thread.currentThread();
fadeInOutLoop(fadeTime, steps, iterations);
Logger.debug("Background fade in-out loop finished");
});
} else {
fadeInOutLoop(fadeTime, steps, iterations);
}
}
private void fadeInOutLoop(float fadeTime, int steps, int iterations) throws RuntimeIOException {
float sleep_time = fadeTime / steps;
float delta = 1f / steps;
Logger.debug("fadeTime={}, steps={}, sleep_time={}s, delta={}", Float.valueOf(fadeTime), Integer.valueOf(steps),
Float.valueOf(sleep_time), Float.valueOf(delta));
running.getAndSet(true);
if (iterations > 0) {
for (int i = 0; i < iterations && running.get(); i++) {
fadeInOut(sleep_time, delta);
}
running.getAndSet(false);
} else if (iterations == INFINITE_ITERATIONS) {
while (running.get()) {
fadeInOut(sleep_time, delta);
}
}
}
private void fadeInOut(float sleepTime, float delta) throws RuntimeIOException {
float value = 0;
while (value <= 1 && running.get()) {
setValueInternal(value);
SleepUtil.sleepSeconds(sleepTime);
value += delta;
}
value = 1;
while (value >= 0 && running.get()) {
setValueInternal(value);
SleepUtil.sleepSeconds(sleepTime);
value -= delta;
}
}
private void stopLoops() {
running.getAndSet(false);
}
private void onOff(float onTime, float offTime) throws RuntimeIOException {
setValueInternal(1);
SleepUtil.sleepSeconds(onTime);
setValueInternal(0);
SleepUtil.sleepSeconds(offTime);
}
protected void setValueInternal(float value) throws RuntimeIOException {
if (value < 0 || value > 1) {
throw new IllegalArgumentException("Value must be 0..1, you requested " + value);
}
device.setValue(value);
}
// Exposed operations
/**
* Get the current PWM output value (0..1).
*
* @return Current PWM output value.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public float getValue() throws RuntimeIOException {
return device.getValue();
}
/**
* Set the PWM output value (0..1).
*
* @param value
* New PWM output value.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
@Override
public void setValue(float value) throws RuntimeIOException {
stopLoops();
setValueInternal(value);
}
/**
* Turn on the device (same as {@code setValue(1)}).
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void on() throws RuntimeIOException {
stopLoops();
setValueInternal(1);
}
/**
* Turn off the device (same as {@code setValue(0)}).
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void off() throws RuntimeIOException {
stopLoops();
setValueInternal(0);
}
/**
* Toggle the state of the device (same as {@code setValue(1 - getvalue())}
* ).
*
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public void toggle() throws RuntimeIOException {
stopLoops();
setValueInternal(1 - device.getValue());
}
/**
* Get the device on / off status.
*
* @return Returns true if the device currently has a value > 0.
* @throws RuntimeIOException
* If an I/O error occurred.
*/
public boolean isOn() throws RuntimeIOException {
return device.getValue() > 0;
}
}
