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Merge pull request #501 from Himmelt/add_set_bit

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Add SetBit method to modify one bit of a byte
This commit is contained in:
Michael Croes
2023-08-18 20:48:32 +02:00
committed by GitHub
parent a8ef47b475 e98ce005c5
commit 22451bc440
2 changed files with 62 additions and 6 deletions
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16
S7.Net.UnitTest/ConvertersUnitTest.cs
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@@ -24,5 +24,21 @@ namespace S7.Net.UnitTest
Assert.IsFalse(dummyByte.SelectBit(7));
}
[TestMethod]
public void T01_TestSetBit()
{
byte dummyByte = 0xAA; // 1010 1010
dummyByte.SetBit(0, true);
dummyByte.SetBit(1, false);
dummyByte.SetBit(2, true);
dummyByte.SetBit(3, false);
Assert.AreEqual<byte>(dummyByte, 0xA5);// 1010 0101
dummyByte.SetBit(4, true);
dummyByte.SetBit(5, true);
dummyByte.SetBit(6, true);
dummyByte.SetBit(7, true);
Assert.AreEqual<byte>(dummyByte, 0xF5);// 1111 0101
}
}
}

52
S7.Net/Conversion.cs
View File

@@ -138,19 +138,59 @@ namespace S7.Net
/// <summary>
/// Helper to get a bit value given a byte and the bit index.
/// Example: DB1.DBX0.5 -> var bytes = ReadBytes(DB1.DBW0); bool bit = bytes[0].SelectBit(5);
/// <br/>
/// <example>
/// Get the bit at DB1.DBX0.5:
/// <code>
/// byte data = ReadByte("DB1.DBB0");
/// bool bit = data.SelectBit(5);
/// </code>
/// </example>
/// </summary>
/// <param name="data"></param>
/// <param name="bitPosition"></param>
/// <returns></returns>
public static bool SelectBit(this byte data, int bitPosition)
/// <param name="data">The data to get from.</param>
/// <param name="index">The zero-based index of the bit to get.</param>
/// <returns>The Boolean value will get.</returns>
public static bool SelectBit(this byte data, int index)
{
int mask = 1 << bitPosition;
int mask = 1 << index;
int result = data & mask;
return (result != 0);
}
/// <summary>
/// Helper to set a bit value to the given byte at the bit index.
/// <br/>
/// <example>
/// Set the bit at index 4:
/// <code>
/// byte data = 0;
/// data.SetBit(4, true);
/// </code>
/// </example>
/// </summary>
/// <param name="data">The data to be modified.</param>
/// <param name="index">The zero-based index of the bit to set.</param>
/// <param name="value">The Boolean value to assign to the bit.</param>
public static void SetBit(this ref byte data, int index, bool value)
{
if ((uint)index > 7)
{
return;
}
if (value)
{
byte mask = (byte)(1 << index);
data |= mask;
}
else
{
byte mask = (byte)~(1 << index);
data &= mask;
}
}
/// <summary>
/// Converts from ushort value to short value; it's used to retrieve negative values from words
/// </summary>