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package com.diozero.devices;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: PCF8574.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 - 2021 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.nio.ByteOrder;
import org.tinylog.Logger;
import com.diozero.api.DeviceMode;
import com.diozero.api.DigitalInputEvent;
import com.diozero.api.GpioEventTrigger;
import com.diozero.api.GpioPullUpDown;
import com.diozero.api.I2CDevice;
import com.diozero.api.PinInfo;
import com.diozero.api.RuntimeIOException;
import com.diozero.internal.spi.AbstractDevice;
import com.diozero.internal.spi.AbstractDeviceFactory;
import com.diozero.internal.spi.AbstractInputDevice;
import com.diozero.internal.spi.GpioDeviceFactoryInterface;
import com.diozero.internal.spi.GpioDigitalInputDeviceInterface;
import com.diozero.internal.spi.GpioDigitalInputOutputDeviceInterface;
import com.diozero.internal.spi.GpioDigitalOutputDeviceInterface;
import com.diozero.internal.spi.I2CDeviceFactoryInterface;
import com.diozero.sbc.BoardPinInfo;
import com.diozero.sbc.DeviceFactoryHelper;
import com.diozero.util.BitManipulation;
import com.diozero.util.MutableByte;
public class PCF8574 extends AbstractDeviceFactory implements GpioDeviceFactoryInterface, GpioExpander {
private static final String DEVICE_NAME = "PCF8574";
private static final int NUM_PINS = 8;
private I2CDevice device;
private MutableByte directions;
private BoardPinInfo boardPinInfo;
public PCF8574(int controller, int address) {
this(DeviceFactoryHelper.getNativeDeviceFactory(), controller, address);
}
public PCF8574(I2CDeviceFactoryInterface deviceFactory, int controller, int address) {
super(DEVICE_NAME + "-" + controller + "-" + address);
boardPinInfo = new PCF8574BoardPinInfo();
device = I2CDevice.builder(address).setFactory(deviceFactory).setController(controller)
.setByteOrder(ByteOrder.LITTLE_ENDIAN).build();
directions = new MutableByte();
}
@Override
public GpioDigitalInputDeviceInterface createDigitalInputDevice(String key, PinInfo pinInfo, GpioPullUpDown pud,
GpioEventTrigger trigger) throws RuntimeIOException {
int gpio = pinInfo.getDeviceNumber();
setInputMode(gpio);
return new PCF8574DigitalInputDevice(this, key, gpio, trigger);
}
@Override
public GpioDigitalOutputDeviceInterface createDigitalOutputDevice(String key, PinInfo pinInfo, boolean initialValue)
throws RuntimeIOException {
int gpio = pinInfo.getDeviceNumber();
setOutputMode(gpio);
return new PCF8574DigitalOutputDevice(this, key, gpio, initialValue);
}
@Override
public GpioDigitalInputOutputDeviceInterface createDigitalInputOutputDevice(String key, PinInfo pinInfo,
DeviceMode mode) throws RuntimeIOException {
return new PCF8574DigitalInputOutputDevice(this, key, pinInfo.getDeviceNumber(), mode);
}
@Override
public void setDirections(int port, byte directions) {
this.directions = new MutableByte(directions);
}
public byte getValues(int port) {
return device.readByteData(1);
}
@Override
public void setValues(int port, byte values) {
device.writeByte(values);
}
public boolean getValue(int gpio) {
if (gpio < 0 || gpio >= NUM_PINS) {
throw new IllegalArgumentException("Invalid GPIO: " + gpio + ". " + DEVICE_NAME + " has " + NUM_PINS
+ " GPIOs; must be 0.." + (NUM_PINS - 1));
}
return (getValues(0) & gpio) != 0;
}
public void setValue(int gpio, boolean value) {
if (gpio < 0 || gpio >= NUM_PINS) {
throw new IllegalArgumentException("Invalid GPIO: " + gpio + ". " + DEVICE_NAME + " has " + NUM_PINS
+ " GPIOs; must be 0.." + (NUM_PINS - 1));
}
byte old_val = getValues(0);
byte new_val = BitManipulation.setBitValue(old_val, value, gpio);
setValues(0, new_val);
}
@Override
public void close() {
if (device != null) {
device.close();
}
}
public void setInputMode(int gpio) {
// Note nothing to do to set the in / out direction for the PCF8574
// We do need to make note of pin direction though
directions.setBit((byte) gpio);
}
public void setOutputMode(int gpio) {
// Note nothing to do to set the in / out direction for the PCF8574
// We do need to make note of pin direction though
directions.unsetBit((byte) gpio);
}
@Override
public String getName() {
return DEVICE_NAME;
}
public void closePin(int gpio) {
Logger.trace("closePin({})", Integer.valueOf(gpio));
if (gpio < 0 || gpio >= NUM_PINS) {
throw new IllegalArgumentException("Invalid GPIO: " + gpio + ". " + DEVICE_NAME + " has " + NUM_PINS
+ " GPIOs; must be 0.." + (NUM_PINS - 1));
}
setInputMode(gpio);
}
@Override
public BoardPinInfo getBoardPinInfo() {
return boardPinInfo;
}
public static class PCF8574BoardPinInfo extends BoardPinInfo {
public PCF8574BoardPinInfo() {
for (int i = 0; i < NUM_PINS; i++) {
addGpioPinInfo(i, i, PinInfo.DIGITAL_IN_OUT);
}
}
}
private static class PCF8574DigitalInputDevice extends AbstractInputDevice
implements GpioDigitalInputDeviceInterface {
private PCF8574 pcf8574;
private int gpio;
public PCF8574DigitalInputDevice(PCF8574 pcf8574, String key, int gpio, GpioEventTrigger trigger) {
super(key, pcf8574);
this.pcf8574 = pcf8574;
this.gpio = gpio;
// Note trigger is currently ignored
}
@Override
protected void closeDevice() throws RuntimeIOException {
Logger.trace("closeDevice()");
removeListener();
pcf8574.closePin(gpio);
}
@Override
public boolean getValue() throws RuntimeIOException {
return pcf8574.getValue(gpio);
}
@Override
public int getGpio() {
return gpio;
}
@Override
public void setDebounceTimeMillis(int debounceTime) {
}
}
private static class PCF8574DigitalInputOutputDevice extends AbstractInputDevice
implements GpioDigitalInputOutputDeviceInterface {
private PCF8574 pcf8574;
private int gpio;
private DeviceMode mode;
public PCF8574DigitalInputOutputDevice(PCF8574 pcf8574, String key, int gpio, DeviceMode mode) {
super(key, pcf8574);
this.pcf8574 = pcf8574;
this.gpio = gpio;
setMode(mode);
}
@Override
public boolean getValue() throws RuntimeIOException {
return pcf8574.getValue(gpio);
}
@Override
public void setValue(boolean value) throws RuntimeIOException {
if (mode != DeviceMode.DIGITAL_OUTPUT) {
throw new IllegalStateException("Can only set output value for digital output pins");
}
pcf8574.setValue(gpio, value);
}
@Override
public int getGpio() {
return gpio;
}
@Override
protected void closeDevice() throws RuntimeIOException {
Logger.trace("closeDevice()");
removeListener();
pcf8574.closePin(gpio);
}
@Override
public DeviceMode getMode() {
return mode;
}
@Override
public void setMode(DeviceMode mode) {
if (mode == DeviceMode.DIGITAL_INPUT) {
pcf8574.setInputMode(gpio);
} else {
pcf8574.setOutputMode(gpio);
}
this.mode = mode;
}
}
private static class PCF8574DigitalOutputDevice extends AbstractDevice implements GpioDigitalOutputDeviceInterface {
private PCF8574 pcf8574;
private int gpio;
public PCF8574DigitalOutputDevice(PCF8574 pcf8574, String key, int gpio, boolean initialValue) {
super(key, pcf8574);
this.pcf8574 = pcf8574;
this.gpio = gpio;
setValue(initialValue);
}
@Override
public boolean getValue() throws RuntimeIOException {
return pcf8574.getValue(gpio);
}
@Override
public void setValue(boolean value) throws RuntimeIOException {
pcf8574.setValue(gpio, value);
}
@Override
public int getGpio() {
return gpio;
}
@Override
protected void closeDevice() throws RuntimeIOException {
Logger.trace("closeDevice()");
pcf8574.closePin(gpio);
}
}
}
