package com.pi4j.gpio.extension.mcp;
import java.util.EnumSet;
import com.pi4j.io.gpio.Pin;
import com.pi4j.io.gpio.PinMode;
import com.pi4j.io.gpio.PinPullResistance;
import com.pi4j.io.gpio.impl.PinImpl;
/*
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: GPIO Extension
* FILENAME : MCP23017Pin.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 - 2013 Pi4J
* %%
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You may obtain a copy of the License
* at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
* #L%
*/
/**
* <p>
* This GPIO provider implements the MCP23017 I2C GPIO expansion board as native Pi4J GPIO pins.
* More information about the board can be found here: *
* http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
* http://learn.adafruit.com/mcp230xx-gpio-expander-on-the-raspberry-pi/overview
* </p>
*
* <p>
* The MCP23017 is connected via I2C connection to the Raspberry Pi and provides
* 16 GPIO pins that can be used for either digital input or digital output pins.
* </p>
*
* @author Robert Savage
*
*/
public class MCP23017Pin {
public static final Pin GPIO_A0 = createDigitalPin(1, "GPIO A0");
public static final Pin GPIO_A1 = createDigitalPin(2, "GPIO A1");
public static final Pin GPIO_A2 = createDigitalPin(4, "GPIO A2");
public static final Pin GPIO_A3 = createDigitalPin(8, "GPIO A3");
public static final Pin GPIO_A4 = createDigitalPin(16, "GPIO A4");
public static final Pin GPIO_A5 = createDigitalPin(32, "GPIO A5");
public static final Pin GPIO_A6 = createDigitalPin(64, "GPIO A6");
public static final Pin GPIO_A7 = createDigitalPin(128, "GPIO A7");
public static final Pin GPIO_B0 = createDigitalPin(1001, "GPIO B0");
public static final Pin GPIO_B1 = createDigitalPin(1002, "GPIO B1");
public static final Pin GPIO_B2 = createDigitalPin(1004, "GPIO B2");
public static final Pin GPIO_B3 = createDigitalPin(1008, "GPIO B3");
public static final Pin GPIO_B4 = createDigitalPin(1016, "GPIO B4");
public static final Pin GPIO_B5 = createDigitalPin(1032, "GPIO B5");
public static final Pin GPIO_B6 = createDigitalPin(1064, "GPIO B6");
public static final Pin GPIO_B7 = createDigitalPin(1128, "GPIO B7");
public static Pin[] ALL_A_PINS = { MCP23017Pin.GPIO_A0, MCP23017Pin.GPIO_A1, MCP23017Pin.GPIO_A2, MCP23017Pin.GPIO_A3,
MCP23017Pin.GPIO_A4, MCP23017Pin.GPIO_A5, MCP23017Pin.GPIO_A6, MCP23017Pin.GPIO_A7 };
public static Pin[] ALL_B_PINS = { MCP23017Pin.GPIO_B0, MCP23017Pin.GPIO_B1, MCP23017Pin.GPIO_B2, MCP23017Pin.GPIO_B3,
MCP23017Pin.GPIO_B4, MCP23017Pin.GPIO_B5, MCP23017Pin.GPIO_B6, MCP23017Pin.GPIO_B7 };
public static Pin[] ALL = { MCP23017Pin.GPIO_A0, MCP23017Pin.GPIO_A1, MCP23017Pin.GPIO_A2, MCP23017Pin.GPIO_A3,
MCP23017Pin.GPIO_A4, MCP23017Pin.GPIO_A5, MCP23017Pin.GPIO_A6, MCP23017Pin.GPIO_A7,
MCP23017Pin.GPIO_B0, MCP23017Pin.GPIO_B1, MCP23017Pin.GPIO_B2, MCP23017Pin.GPIO_B3,
MCP23017Pin.GPIO_B4, MCP23017Pin.GPIO_B5, MCP23017Pin.GPIO_B6, MCP23017Pin.GPIO_B7 };
private static Pin createDigitalPin(int address, String name) {
return new PinImpl(MCP23017GpioProvider.NAME, address, name,
EnumSet.of(PinMode.DIGITAL_INPUT, PinMode.DIGITAL_OUTPUT),
EnumSet.of(PinPullResistance.PULL_UP, PinPullResistance.OFF));
}
}