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This bundle wraps Pi4j (http://pi4j.com) that wraps the native code Wiring Pi (http://wiringpi.com). It wraps these libraries to make them OSGi friendly and allow them to work together with the OSGi enRoute IoT circuit library (osgi.enroute.iot.circuit). The bundle will first use Pi4J to detect on what hardware it runs. If it runs on an appropriate type, it will register a component that can be configured with Metatype. The Metatype defines a full blown configuration template for all the Pi's functions. The GPIO's are registered as components for the circuit. Regardless of the success of the configuration, this bundle will also register a GpioController service, which is the main Pi4J class.
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package osgi.enroute.iot.pi.provider;
/*
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: Java Examples
* FILENAME : WiringPiSPIExample.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%
*/
import com.pi4j.wiringpi.Spi;
public class WiringPiSPIExample {
// SPI operations
public static byte WRITE_CMD = 0x40;
public static byte READ_CMD = 0x41;
@SuppressWarnings("unused")
public static void main(String args[]) throws InterruptedException {
//
// This SPI example is using the WiringPi native library to communicate with
// the SPI hardware interface connected to a MCP23S17 I/O Expander.
//
// Please note the following command are required to enable the SPI driver on
// your Raspberry Pi:
// > sudo modprobe spi_bcm2708
// > sudo chown `id -u`.`id -g` /dev/spidev0.*
//
// this source code was adapted from:
// https://github.com/thomasmacpherson/piface/blob/master/python/piface/pfio.py
//
// see this blog post for additional details on SPI and WiringPi
// http://wiringpi.com/reference/spi-library/
//
// see the link below for the data sheet on the MCP23S17 chip:
// http://ww1.microchip.com/downloads/en/devicedoc/21952b.pdf
System.out.println("<--Pi4J--> SPI test program using MCP23S17 I/O Expander Chip");
// configuration
byte IODIRA = 0x00; // I/O direction A
byte IODIRB = 0x01; // I/O direction B
byte IOCON = 0x0A; // I/O config
byte GPIOA = 0x12; // port A
byte GPIOB = 0x13; // port B
byte GPPUA = 0x0C; // port A pullups
byte GPPUB = 0x0D; // port B pullups
byte OUTPUT_PORT = GPIOA;
byte INPUT_PORT = GPIOB;
byte INPUT_PULLUPS = GPPUB;
// setup SPI for communication
int fd = Spi.wiringPiSPISetup(0, 10000000);
if (fd <= -1) {
System.out.println(" ==>> SPI SETUP FAILED");
return;
}
// initialize
write(IOCON, 0x08); // enable hardware addressing
write(GPIOA, 0x00); // set port A off
write(IODIRA, 0); // set port A as outputs
write(IODIRB, 0xFF); // set port B as inputs
write(GPPUB, 0xFF); // set port B pullups on
int pins = 1;
// infinite loop
while(true) {
// shift the bit to the left in the A register
// this will cause the next LED to light up and
// the current LED to turn off.
if(pins >= 255)
pins=1;
write(GPIOA, (byte)pins);
pins = pins << 1;
Thread.sleep(1000);
// read for input changes
//read(INPUT_PORT);
}
}
public static void write(byte register, int data){
// send test ASCII message
byte packet[] = new byte[3];
packet[0] = WRITE_CMD; // address byte
packet[1] = register; // register byte
packet[2] = (byte)data; // data byte
System.out.println("-----------------------------------------------");
System.out.println("[TX] " + bytesToHex(packet));
Spi.wiringPiSPIDataRW(0, packet, 3);
System.out.println("[RX] " + bytesToHex(packet));
System.out.println("-----------------------------------------------");
}
public static void read(byte register){
// send test ASCII message
byte packet[] = new byte[3];
packet[0] = READ_CMD; // address byte
packet[1] = register; // register byte
packet[2] = 0b00000000; // data byte
System.out.println("-----------------------------------------------");
System.out.println("[TX] " + bytesToHex(packet));
Spi.wiringPiSPIDataRW(0, packet, 3);
System.out.println("[RX] " + bytesToHex(packet));
System.out.println("-----------------------------------------------");
}
public static String bytesToHex(byte[] bytes) {
final char[] hexArray = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
char[] hexChars = new char[bytes.length * 2];
int v;
for ( int j = 0; j < bytes.length; j++ ) {
v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}