package com.intelligt.modbus.jlibmodbus.net.stream;
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import com.intelligt.modbus.jlibmodbus.Modbus;
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import com.intelligt.modbus.jlibmodbus.exception.ModbusChecksumException;
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import com.intelligt.modbus.jlibmodbus.serial.SerialPort;
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import com.intelligt.modbus.jlibmodbus.utils.DataUtils;
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import java.io.IOException;
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/*
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* Copyright (C) 2016 "Invertor" Factory", JSC
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* [http://www.sbp-invertor.ru]
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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 InputStreamASCII extends InputStreamSerial {
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private int lrc = 0;
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public InputStreamASCII(SerialPort serial) {
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super(serial);
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}
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private void lrcAdd(byte b) {
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lrc += b;
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}
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private int lrcGet() {
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return (byte) -lrc;
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}
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@Override
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public void frameCheck() throws IOException, ModbusChecksumException {
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int c_lrc = (byte) lrcGet();
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int r_lrc = (byte) read();
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int cr = readRaw();
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int lf = readRaw();
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// following checks delimiter has read (LF character by default)
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if (cr != Modbus.ASCII_CODE_CR || lf != Modbus.getAsciiMsgDelimiter())
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Modbus.log().warning("\\r\\n not received.");
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if (c_lrc != r_lrc) {
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throw new ModbusChecksumException(r_lrc, c_lrc);
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}
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}
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@Override
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public void frameInit() throws IOException {
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lrc = 0;
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char c = (char) readRaw();
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if (c != Modbus.ASCII_CODE_COLON) {
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throw new IOException("no bytes read");
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}
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}
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public int readRaw() throws IOException {
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return super.read();
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}
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@Override
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public int read() throws IOException {
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int b;
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char c = (char) readRaw();
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b = DataUtils.fromAscii(c, (char) readRaw());
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lrcAdd((byte) b);
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return b;
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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for (int i = off; i < len; i++) {
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b[i] = (byte) read();
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}
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return len;
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}
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}
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