96 lines
2.9 KiB
C#
96 lines
2.9 KiB
C#
// <copyright file="Chip.cs" company="Adrian Conlon">
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// Copyright (c) Adrian Conlon. All rights reserved.
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// </copyright>
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namespace EightBit
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{
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public class Chip : Device
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{
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protected Chip()
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{
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}
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public static byte Bit(int which) => (byte)(1 << which);
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public static byte Bit(byte which) => Bit((int)which);
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public static byte SetBit(byte input, byte which) => (byte)(input | which);
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public static byte SetBit(byte input, byte which, int condition) => SetBit(input, which, condition != 0);
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public static byte SetBit(byte input, byte which, bool condition) => condition ? SetBit(input, which) : ClearBit(input, which);
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public static byte ClearBit(byte input, byte which) => (byte)(input & (byte)~which);
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public static byte ClearBit(byte input, byte which, int condition) => ClearBit(input, which, condition != 0);
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public static byte ClearBit(byte input, byte which, bool condition) => SetBit(input, which, !condition);
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public static byte HighByte(int value) => (byte)(value >> 8);
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public static byte HighByte(ushort value) => HighByte((int)value);
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public static byte LowByte(int value) => (byte)(value & (int)Mask.Eight);
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public static byte LowByte(ushort value) => LowByte((int)value);
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public static ushort PromoteByte(byte value) => (ushort)(value << 8);
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public static byte DemoteByte(ushort value) => HighByte(value);
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public static ushort HigherPart(ushort value) => (ushort)(value & 0xff00);
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public static byte LowerPart(ushort value) => LowByte(value);
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public static ushort MakeWord(byte low, byte high) => (ushort)(PromoteByte(high) | low);
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public static int HighNibble(byte value) => value >> 4;
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public static int LowNibble(byte value) => value & 0xf;
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public static int HigherNibble(byte value) => value & 0xf0;
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public static int LowerNibble(byte value) => LowNibble(value);
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public static int PromoteNibble(byte value) => LowByte(value << 4);
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public static int DemoteNibble(byte value) => HighNibble(value);
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public static int CountBits(int value)
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{
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var count = 0;
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while (value != 0)
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{
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++count;
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value &= value - 1;
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}
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return count;
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}
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public static int CountBits(byte value) => CountBits((int)value);
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public static bool EvenParity(int value) => CountBits(value) % 2 == 0;
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public static bool EvenParity(byte value) => EvenParity((int)value);
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public static int FindFirstSet(int value)
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{
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if (value == 0)
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{
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return 0;
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}
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var test = 1;
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var result = 1;
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while ((value & test) == 0)
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{
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test <<= 1;
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++result;
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}
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return result;
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}
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}
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}
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