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FirmataCommandSequence.cs
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FirmataCommandSequence.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Text;
namespace Iot.Device.Arduino
{
/// <summary>
/// A firmata command sequence
/// Intended to be changed to public visibility later
/// </summary>
internal class FirmataCommandSequence
{
private List<byte> _sequence;
/// <summary>
/// Create a new command sequence
/// </summary>
/// <param name="command">The first byte of the command</param>
public FirmataCommandSequence(FirmataCommand command = FirmataCommand.START_SYSEX)
{
_sequence = new List<byte>()
{
(byte)command
};
}
internal List<byte> Sequence => _sequence;
public int Length => _sequence.Count;
public void WriteByte(byte b)
{
_sequence.Add(b);
}
internal bool Validate()
{
if (Length < 2)
{
return false;
}
if (Sequence[0] == (byte)FirmataCommand.START_SYSEX && Sequence[Sequence.Count - 1] != (byte)FirmataCommand.END_SYSEX)
{
return false;
}
return true;
}
public void AddValuesAsTwo7bitBytes(ReadOnlySpan<byte> values)
{
for (int i = 0; i < values.Length; i++)
{
_sequence.Add((byte)(values[i] & (uint)sbyte.MaxValue));
_sequence.Add((byte)(values[i] >> 7 & sbyte.MaxValue));
}
}
}
}