package com.intelligt.modbus.jlibmodbus.serial;
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import com.google.android.things.pio.PeripheralManager;
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import com.google.android.things.pio.UartDevice;
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import com.intelligt.modbus.jlibmodbus.Modbus;
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import com.intelligt.modbus.jlibmodbus.utils.ByteFifo;
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import java.io.IOException;
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/*
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* Copyright (C) 2017 Vladislav Y. Kochedykov
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*
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* [http://jlibmodbus.sourceforge.net]
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*
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* This file is part of JLibModbus.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Authors: Vladislav Y. Kochedykov, software engineer.
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* email: vladislav.kochedykov@gmail.com
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*/
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public class SerialPortAT extends SerialPort {
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private UartDevice port;
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byte[] buffer = new byte[Modbus.MAX_PDU_LENGTH];
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volatile long readTime = 0;
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public SerialPortAT(SerialParameters sp) {
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super(sp);
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port = null;
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}
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@Override
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public void write(int b) throws IOException {
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try {
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port.write(new byte[]{(byte)(b&0xff)}, 1);
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} catch (Exception e) {
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throw new IOException(e);
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}
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}
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@Override
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public void write(byte[] bytes) throws IOException {
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try {
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port.write(bytes, bytes.length);
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} catch (Exception e) {
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throw new IOException(e);
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}
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}
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@Override
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public void open() throws SerialPortException {
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try {
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SerialParameters sp = getSerialParameters();
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port = PeripheralManager.getInstance().openUartDevice(sp.getDevice());
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port.setBaudrate(sp.getBaudRate());
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port.setDataSize(sp.getDataBits());
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port.setParity(sp.getParity().getValue());
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port.setStopBits(sp.getStopBits());
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port.setHardwareFlowControl(UartDevice.HW_FLOW_CONTROL_NONE);
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} catch (Exception ex) {
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throw new SerialPortException(ex);
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}
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}
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@Override
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public int read() throws IOException {
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try {
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readTime = System.currentTimeMillis();
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while (port.read(buffer, 1) < 1) {
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if ((System.currentTimeMillis() - readTime) > getReadTimeout()) {
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throw new IOException("Read timeout");
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}
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}
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return buffer[0];
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} catch (Exception e) {
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throw new IOException(e);
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}
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}
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@Override
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public int read(byte[] b, int off, final int len) throws IOException {
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try {
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readTime = System.currentTimeMillis();
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int read;
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int count = 0;
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int length = len-off;
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if (length < 0 || b.length < off+len)
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throw new ArrayIndexOutOfBoundsException("len + off is greater than b.length");
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while (count < length) {
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read = port.read(buffer, length-count);
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count += read;
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if (count > length) {
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int diff = count - length;
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read -= diff;
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count -= diff;
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}
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System.arraycopy(buffer, 0, b, off, read);
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off += read;
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if ((System.currentTimeMillis() - readTime) > getReadTimeout()) {
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throw new IOException("Read timeout");
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}
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}
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return count;
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} catch (Exception e) {
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throw new IOException(e);
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}
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}
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@Override
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public void close() {
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if (isOpened()) {
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try {
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synchronized (this) {
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port.close();
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port = null;
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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@Override
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synchronized public boolean isOpened() {
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return port != null;
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}
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}
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