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Pi4J Java API & Runtime Library
package com.pi4j.io.gpio;
import com.pi4j.io.gpio.event.PinListener;
import com.pi4j.wiringpi.GpioInterruptEvent;
import com.pi4j.wiringpi.GpioInterruptListener;
import com.pi4j.wiringpi.GpioUtil;
/*
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: Java Library (Core)
* FILENAME : RaspiGpioProvider.java
*
* This file is part of the Pi4J project. More information about
* this project can be found here: http://www.pi4j.com/
* **********************************************************************
* %%
* Copyright (C) 2012 - 2015 Pi4J
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
/**
* Raspberry PI {@link GpioProvider} implementation.
*
* @author Robert Savage (http://www.savagehomeautomation.com)
*/
@SuppressWarnings("unused")
public class RaspiGpioProvider extends GpioProviderBase implements GpioProvider, GpioInterruptListener {
public static final String NAME = "RaspberryPi GPIO Provider";
public RaspiGpioProvider() {
// set wiringPi interface for internal use
// we will use the WiringPi pin number scheme with the wiringPi library
com.pi4j.wiringpi.Gpio.wiringPiSetup();
}
@Override
public String getName() {
return NAME;
}
@Override
public boolean hasPin(Pin pin) {
return (com.pi4j.wiringpi.GpioUtil.isPinSupported(pin.getAddress()) > 0);
}
@Override
public void export(Pin pin, PinMode mode) {
export(pin, mode, null);
}
@Override
public void export(Pin pin, PinMode mode, PinState defaultState) {
super.export(pin, mode);
//System.out.println("-- EXPORTING PIN [" + pin.getAddress() + "] to mode [" + mode.getName() + "]");
// get mode configured direction value
int direction = mode.getDirection().getValue();
// if a default state was provided and the direction is OUT, then override the
// pin direction to include initial state value
if(defaultState != null && mode.getDirection() == PinDirection.OUT){
if(defaultState == PinState.LOW)
direction = GpioUtil.DIRECTION_LOW;
else if(defaultState == PinState.HIGH)
direction = GpioUtil.DIRECTION_HIGH;
}
// if not already exported, export the pin and set the pin direction
if(!com.pi4j.wiringpi.GpioUtil.isExported(pin.getAddress())){
com.pi4j.wiringpi.GpioUtil.export(pin.getAddress(), direction);
}
// if the pin is already exported, then check its current configured direction
// if the direction does not match, then set the new direction for the pin
else if(com.pi4j.wiringpi.GpioUtil.getDirection(pin.getAddress()) != mode.getDirection().getValue()){
com.pi4j.wiringpi.GpioUtil.setDirection(pin.getAddress(), direction);
}
// set the pin input/output mode
setMode(pin, mode);
}
@Override
public boolean isExported(Pin pin) {
super.isExported(pin);
// return the pin exported state
return com.pi4j.wiringpi.GpioUtil.isExported(pin.getAddress());
}
@Override
public void unexport(Pin pin) {
super.unexport(pin);
// unexport the pins
com.pi4j.wiringpi.GpioUtil.unexport(pin.getAddress());
}
@Override
public void setMode(Pin pin, PinMode mode) {
super.setMode(pin, mode);
com.pi4j.wiringpi.Gpio.pinMode(pin.getAddress(), mode.getValue());
// if this is an input pin, then configure edge detection
if (PinMode.allInputs().contains(mode)) {
com.pi4j.wiringpi.GpioUtil.setEdgeDetection(pin.getAddress(), PinEdge.BOTH.getValue());
}
}
@Override
public PinMode getMode(Pin pin) {
// TODO : get actual pin mode from native impl
return super.getMode(pin);
}
@Override
public void setPullResistance(Pin pin, PinPullResistance resistance) {
super.setPullResistance(pin, resistance);
com.pi4j.wiringpi.Gpio.pullUpDnControl(pin.getAddress(), resistance.getValue());
}
@Override
public PinPullResistance getPullResistance(Pin pin) {
// TODO : get actual pin pull resistance from native impl
return super.getPullResistance(pin);
}
@Override
public void setState(Pin pin, PinState state) {
super.setState(pin, state);
com.pi4j.wiringpi.Gpio.digitalWrite(pin.getAddress(), state.getValue());
}
@Override
public PinState getState(Pin pin) {
super.getState(pin);
// return pin state
PinState state = null;
int ret = com.pi4j.wiringpi.Gpio.digitalRead(pin.getAddress());
if (ret >= 0) {
state = PinState.getState(ret);
}
return state;
}
@Override
public void setValue(Pin pin, double value) {
super.setValue(pin, value);
throw new RuntimeException("This GPIO provider does not support analog pins.");
}
@Override
public double getValue(Pin pin) {
super.getValue(pin);
throw new RuntimeException("This GPIO provider does not support analog pins.");
}
@Override
public void setPwm(Pin pin, int value) {
super.setPwm(pin, value);
if (getMode(pin) == PinMode.PWM_OUTPUT) {
setPwmValue(pin, value);
}
}
@Override
public int getPwm(Pin pin) {
return super.getPwm(pin);
}
// internal
private void setPwmValue(Pin pin, int value) {
// set pin PWM value
com.pi4j.wiringpi.Gpio.pwmWrite(pin.getAddress(), value);
}
@Override
public void pinStateChange(GpioInterruptEvent event) {
// iterate over the pin listeners map
for (Pin pin : listeners.keySet()) {
// dispatch this event to the listener
// if a matching pin address is found
if (pin.getAddress() == event.getPin()) {
dispatchPinDigitalStateChangeEvent(pin, PinState.getState(event.getState()));
}
}
}
@Override
public void addListener(Pin pin, PinListener listener) {
super.addListener(pin, listener);
// update the native interrupt listener thread for callbacks
updateInterruptListener(pin);
}
@Override
public void removeListener(Pin pin, PinListener listener) {
super.removeListener(pin, listener);
// update the native interrupt listener thread for callbacks
updateInterruptListener(pin);
}
// internal
private void updateInterruptListener(Pin pin) {
if (listeners.size() > 0) {
// setup interrupt listener native thread and enable callbacks
if (!com.pi4j.wiringpi.GpioInterrupt.hasListener(this)) {
com.pi4j.wiringpi.GpioInterrupt.addListener(this);
}
com.pi4j.wiringpi.GpioInterrupt.enablePinStateChangeCallback(pin.getAddress());
} else {
// remove interrupt listener, disable native thread and callbacks
com.pi4j.wiringpi.GpioInterrupt.disablePinStateChangeCallback(pin.getAddress());
if (com.pi4j.wiringpi.GpioInterrupt.hasListener(this)) {
com.pi4j.wiringpi.GpioInterrupt.removeListener(this);
}
}
}
}
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