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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 : TestSerial.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.util.Arrays;
import java.util.Random;
/**
* Main class.
*
* @author Robert Savage (http://www.savagehomeautomation.com)
* @version $Id: $Id
*/
public class TestSerial {
private static final Logger logger = LoggerFactory.getLogger(TestSerial.class);
private static String SERIAL_DEVICE = "/dev/ttyS0";
private static int BAUD_RATE = 9600;
/**
* main.
*
* @param args an array of {@link String} objects.
* @throws Exception if any.
*/
public static void main(String[] args) throws Exception {
PiGpio piGpio = PiGpio.newNativeInstance();
piGpio.gpioInitialise();
logger.info("PIGPIO INITIALIZED");
logger.info("PIGPIO VERSION : {}", piGpio.gpioVersion());
logger.info("PIGPIO HARDWARE : {}", piGpio.gpioHardwareRevision());
int handle = piGpio.serOpen(SERIAL_DEVICE, BAUD_RATE, 0);
logger.info("PIGPIO SERIAL OPEN : {}", handle);
if(handle < 0) {
logger.error("ERROR; SERIAL OPEN FAILED: ERROR CODE: {}", handle);
System.exit(handle);
}
logger.info("SERIAL DATA DRAINED : {}", piGpio.serDrain(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("[SERIAL W/R BYTE]");
// WRITE :: SINGLE RAW BYTE
logger.info(" (WRITE) 0x{}", Integer.toHexString(b));
int result = piGpio.serWriteByte(handle, (byte)b);
if(result < 0) {
logger.error("\nERROR; SERIAL 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(5);
// READ :: NUMBER OF BYTES AVAILABLE TO READ
int available = piGpio.serDataAvailable(handle);
logger.info(" (AVAIL) {}", available);
if(available != 1) {
logger.error("\nERROR; SERIAL AVAILABLE FAILED: expected=1; received={}", available);
System.exit(result);
}
// READ :: SINGLE RAW BYTE
result = piGpio.serReadByte(handle);
logger.info(" (READ) 0x{}", Integer.toHexString(result));
logger.info("");
if(result < 0) {
logger.error("\nERROR; SERIAL READ FAILED: ERROR CODE: {}", result);
System.exit(result);
}
int expected = b;
int recevied = result;
if(recevied != expected) {
logger.error("\nERROR; SERIAL READ FAILED: BYTE MISMATCH: expected={}; received={}", expected, recevied);
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("[SERIAL 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.serWrite(handle, writeBuffer, len);
if(result < 0) {
logger.error("\nERROR; SERIAL 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(40);
// READ :: NUMBER OF BYTES AVAILABLE TO READ
int available = piGpio.serDataAvailable(handle);
logger.info(" (AVAIL) {}", available);
if(available != len) {
logger.error("\nERROR; SERIAL AVAILABLE FAILED: expected=1; received={}", available);
System.exit(result);
}
// READ :: MULTI-BYTE
byte[] readBuffer = new byte[available];
result = piGpio.serRead(handle, readBuffer, available);
logger.info(" (READ) 0x{}", StringUtil.toHexString(readBuffer));
logger.info("");
if(result < 0) {
logger.error("\nERROR; SERIAL READ FAILED: ERROR CODE: {}", result);
System.exit(result);
}
// validate read length
if(result != len) {
logger.error("\nERROR; SERIAL READ FAILED: LENGTH MISMATCH: {}", result);
System.exit(result);
}
// validate buffer contents
if(!Arrays.equals(writeBuffer, readBuffer)) {
logger.error("\nERROR; SERIAL READ FAILED: BYTE MISMATCH: expected={}; received={}",
StringUtil.toHexString(writeBuffer), StringUtil.toHexString(readBuffer));
System.exit(0);
}
}
// close SERIAL channel
int closed = piGpio.serClose(handle);
logger.info("PIGPIO SERIAL CLOSED : {}", handle);
piGpio.shutdown();
logger.info("PIGPIO TERMINATED");
logger.info("ALL SERIAL TESTS COMPLETED SUCCESSFULLY");
}
}
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