using System;
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using WIDESEAWCS_S7Simulator.Core.Interfaces;
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namespace WIDESEAWCS_S7Simulator.Core.Memory
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{
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/// <summary>
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/// T区（定时器区/Timer）实现
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/// 用于模拟西门子S7 PLC的定时器区域
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/// 每个定时器占用2字节，存储定时器的时间值（毫秒）
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/// </summary>
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public class TRegion : MemoryRegion, IMemoryRegion
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{
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/// <summary>
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/// 标识对象是否已被释放
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/// </summary>
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private bool _disposed = false;
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/// <summary>
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/// 区域类型
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/// </summary>
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public override string RegionType => "T";
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/// <summary>
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/// 每个定时器占用的字节数（S7定时器为2字节）
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/// </summary>
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private const int TimerSize = 2;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="timerCount">定时器数量</param>
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public TRegion(int timerCount) : base(timerCount * TimerSize)
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{
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}
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/// <summary>
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/// 读取定时器值
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/// </summary>
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/// <param name="timerNumber">定时器号（从1开始）</param>
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/// <returns>定时器值（毫秒）</returns>
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public ushort ReadTimer(ushort timerNumber)
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{
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if (_disposed)
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throw new ObjectDisposedException(nameof(TRegion));
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ushort offset = (ushort)((timerNumber - 1) * TimerSize);
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var data = Read(offset, TimerSize);
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return (ushort)((data[0] << 8) | data[1]);
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}
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/// <summary>
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/// 写入定时器值
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/// </summary>
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/// <param name="timerNumber">定时器号（从1开始）</param>
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/// <param name="value">定时器值（毫秒）</param>
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public void WriteTimer(ushort timerNumber, ushort value)
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{
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if (_disposed)
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throw new ObjectDisposedException(nameof(TRegion));
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ushort offset = (ushort)((timerNumber - 1) * TimerSize);
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var data = new byte[] { (byte)(value >> 8), (byte)(value & 0xFF) };
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Write(offset, data);
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}
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/// <summary>
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/// 释放资源
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/// </summary>
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/// <param name="disposing">是否正在释放托管资源</param>
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protected override void Dispose(bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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{
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// 释放托管资源
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}
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_disposed = true;
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}
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base.Dispose(disposing);
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}
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}
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}
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