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51 lines
1.0 KiB
C++
51 lines
1.0 KiB
C++
//
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// MFM.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "MFM.hpp"
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using namespace Storage::Encodings;
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void Shifter::add_sync()
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{
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// i.e. 0100 0100 1000 1001
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output = (uint16_t)((output << 15) | 0x4489);
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}
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void MFMShifter::shift(uint8_t input)
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{
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uint16_t spread_value =
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(uint16_t)(
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((input & 0x01) << 0) |
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((input & 0x02) << 1) |
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((input & 0x04) << 2) |
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((input & 0x08) << 3) |
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((input & 0x10) << 4) |
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((input & 0x20) << 5) |
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((input & 0x40) << 6) |
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((input & 0x80) << 7)
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);
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uint16_t or_bits = (uint16_t)((spread_value << 1) | (spread_value >> 1) | (output << 15));
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output = spread_value | ((~or_bits) & 0xaaaa);
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}
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void FMShifter::shift(uint8_t input)
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{
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output =
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(uint16_t)(
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((input & 0x01) << 0) |
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((input & 0x02) << 1) |
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((input & 0x04) << 2) |
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((input & 0x08) << 3) |
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((input & 0x10) << 4) |
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((input & 0x20) << 5) |
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((input & 0x40) << 6) |
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((input & 0x80) << 7) |
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0xaaaa
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);
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}
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