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Pi4J wrapper for the PIGPIO library
package com.pi4j.library.pigpio.test;
/*-
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: LIBRARY :: JNI Wrapper for PIGPIO Library
* FILENAME : TestSpi.java
*
* This file is part of the Pi4J project. More information about
* this project can be found here: https://pi4j.com/
* **********************************************************************
*
* 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.library.pigpio.PiGpio;
import com.pi4j.library.pigpio.util.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Random;
/**
* Main class.
*
* @author Robert Savage (http://www.savagehomeautomation.com)
* @version $Id: $Id
*/
public class TestSpi {
private static final Logger logger = LoggerFactory.getLogger(TestSpi.class);
/**
* main.
*
* @param args an array of {@link String} objects.
*/
public static void main(String[] args) {
PiGpio piGpio = PiGpio.newNativeInstance();
int init = piGpio.initialize();
logger.info("PIGPIO INITIALIZED: {}", init);
logger.info("PIGPIO VERSION : {}", piGpio.gpioVersion());
logger.info("PIGPIO HARDWARE : {}", piGpio.gpioHardwareRevision());
int handle = piGpio.spiOpen(0, 50000, 0);
logger.info("PIGPIO SPI OPEN : {}", handle);
if(handle < 0) {
logger.error("ERROR; SPI OPEN FAILED: ERROR CODE: {}", handle);
System.exit(handle);
}
// iterate over BYTE range of values, WRITE the byte then immediately
// READ back the byte value and compare to make sure they are the same values.
for(int b = 0; b < 256; b++) {
logger.info("[W/R BYTE]");
// WRITE :: SINGLE RAW BYTE
logger.info(" (WRITE) 0x{}", Integer.toHexString(b));
int result = piGpio.spiWrite(handle, new byte[]{ (byte)b }, 1);
if(result < 0) {
logger.error("\nERROR; SPI WRITE FAILED: ERROR CODE: {}", result);
System.exit(result);
}
// READ :: SINGLE RAW BYTE
byte rx[] = new byte[1];
result = piGpio.spiRead(handle, rx, 1);
logger.info(" (READ) 0x{}", StringUtil.toHexString(rx));
logger.info("");
if(result < 0) {
logger.error("\nERROR; SPI READ FAILED: ERROR CODE: {}", result);
System.exit(result);
}
int expected = b;
int received = Byte.toUnsignedInt(rx[0]);
if(received != expected) {
logger.error("\nERROR; SPI READ FAILED: BYTE MISMATCH: expected={}; received={}", expected, received);
System.exit(0);
}
}
for(int b = 0; b < 256; b++) {
logger.info("[XFER BYTE]");
// WRITE :: SINGLE RAW BYTE
byte tx[] = new byte[] {(byte)(b)};
byte rx[] = new byte[] {0};
logger.info(" (WRITE) 0x{}", StringUtil.toHexString(tx));
int result = piGpio.spiXfer(handle, tx, rx, 1);
logger.info(" (READ) 0x{}", StringUtil.toHexString(rx));
logger.info("");
if(result < 0) {
logger.error("\nERROR; SPI XFER FAILED: ERROR CODE: {}", result);
System.exit(result);
}
if(b>0) { // ignore first read
int expected = b-1;
int received = Byte.toUnsignedInt(rx[0]);
if (received != expected) {
logger.error("\nERROR; SPI XFER FAILED: BYTE MISMATCH: expected={}; received={}", expected, received);
System.exit(0);
}
}
}
// iterate over series of test values, WRITE the byte then immediately
// READ back the byte value and compare to make sure they are the same values.
for(int x = 1; x < 50; x++) {
logger.info("[W/R BUFFER]");
Random r = new Random();
int len = r.nextInt((20)) + 2; // minimum of 2 bytes
byte[] writeBuffer = new byte[len];
r.nextBytes(writeBuffer);
// WRITE :: MULTI-BYTE
logger.info(" (WRITE) 0x{}", StringUtil.toHexString(writeBuffer));
int result = piGpio.spiWrite(handle, writeBuffer, len);
if(result < 0) {
logger.error("\nERROR; SPI WRITE FAILED: ERROR CODE: {}", result);
System.exit(result);
}
// take a breath to allow time for the serial data
// to get updated in the serial receive buffer
//Thread.sleep(50);
// READ :: MULTI-BYTE
byte[] readBuffer = new byte[len];
result = piGpio.spiRead(handle, readBuffer, len);
logger.info(" (READ) 0x{}", StringUtil.toHexString(readBuffer));
logger.info("");
if(result < 0) {
logger.error("\nERROR; SPI READ FAILED: ERROR CODE: {}", result);
System.exit(result);
}
// validate read length
if(result != len) {
logger.error("\nERROR; SPI READ FAILED: LENGTH MISMATCH: {}", result);
System.exit(result);
}
// the test harness will return a byte array where the first byte value in the array
// is the last byte written to the SPI device followed by bytes from the original write
// buffer from left to right (excluding the last byte)
// example : WRITE="ABCDEF" / READ="FABCDE"
ByteBuffer expectBuffer = ByteBuffer.allocate(len);
expectBuffer.put(writeBuffer[writeBuffer.length-1]);
expectBuffer.put(Arrays.copyOfRange(writeBuffer, 0, writeBuffer.length-1));
if(expectBuffer.get(0) != readBuffer[0]) {
logger.error("\nERROR; SPI READ FAILED: BYTE MISMATCH: expected={}; received={}",
StringUtil.toHexString(expectBuffer), StringUtil.toHexString(readBuffer));
System.exit(0);
}
}
// close SPI channel
piGpio.spiClose(handle);
piGpio.shutdown();
logger.info("PIGPIO TERMINATED");
}
}
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