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Adds bit-level Spectrum-style tape parsing.

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More to do, obviously.
This commit is contained in:
Thomas Harte 2021-03-07 15:51:25 -05:00
parent 8a1c6978de
commit d93d380c88
3 changed files with 154 additions and 0 deletions
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8
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -243,6 +243,8 @@
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@ -1252,6 +1254,8 @@
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@ -3021,11 +3025,13 @@
4B8805F21DCFD22A003085B1 /* Commodore.cpp */,
4B0E61051FF34737002A9DBD /* MSX.cpp */,
4B8805F91DCFF807003085B1 /* Oric.cpp */,
4B5D5C9525F56FC7001B4623 /* Spectrum.cpp */,
4BBFBB6A1EE8401E00C01E7A /* ZX8081.cpp */,
4B8805EF1DCFC99C003085B1 /* Acorn.hpp */,
4B8805F31DCFD22A003085B1 /* Commodore.hpp */,
4B0E61061FF34737002A9DBD /* MSX.hpp */,
4B8805FA1DCFF807003085B1 /* Oric.hpp */,
4B5D5C9625F56FC7001B4623 /* Spectrum.hpp */,
4B4518A71F76004200926311 /* TapeParser.hpp */,
4BBFBB6B1EE8401E00C01E7A /* ZX8081.hpp */,
);
@ -5050,6 +5056,7 @@
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4B055AD81FAE9B180060FFFF /* Video.cpp in Sources */,
4B5D5C9825F56FC7001B4623 /* Spectrum.cpp in Sources */,
4B2E86D025D8D8C70024F1E9 /* Keyboard.cpp in Sources */,
4B89452F201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
4B894531201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
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4B1B88BB202E2EC100B67DFF /* MultiKeyboardMachine.cpp in Sources */,
4B5D5C9725F56FC7001B4623 /* Spectrum.cpp in Sources */,
4B4518A11F75FD1C00926311 /* D64.cpp in Sources */,
4B1558C01F844ECD006E9A97 /* BitReverse.cpp in Sources */,
4BCE0052227CE8CA000CA200 /* DiskIICard.cpp in Sources */,

98
Storage/Tape/Parsers/Spectrum.cpp Normal file
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@ -0,0 +1,98 @@
//
// Spectrum.cpp
// Clock Signal
//
// Created by Thomas Harte on 07/03/2021.
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#include "Spectrum.hpp"
//
// Source used for the logic below was primarily https://sinclair.wiki.zxnet.co.uk/wiki/Spectrum_tape_interface
//
using namespace Storage::Tape::ZXSpectrum;
void Parser::process_pulse(const Storage::Tape::Tape::Pulse &pulse) {
if(pulse.type == Storage::Tape::Tape::Pulse::Type::Zero) {
push_wave(WaveType::Gap);
return;
}
// Only pulse duration matters; the ZX Spectrum et al do not rely on polarity.
const float t_states = pulse.length.get<float>() * 3'500'000.0f;
// Too long => gap.
if(t_states > 2400.0f) {
push_wave(WaveType::Gap);
return;
}
// 1940–2400 t-states => pilot.
if(t_states > 1940.0f) {
push_wave(WaveType::Pilot);
return;
}
// 1282–1940 t-states => one.
if(t_states > 1282.0f) {
push_wave(WaveType::One);
return;
}
// 895–1282 => zero.
if(t_states > 795.0f) {
push_wave(WaveType::Zero);
return;
}
// 701–895 => sync 2.
if(t_states > 701.0f) {
push_wave(WaveType::Sync2);
return;
}
// Anything remaining above 600 => sync 1.
if(t_states > 600.0f) {
push_wave(WaveType::Sync1);
return;
}
// Whatever this was, it's too short. Call it a gap.
push_wave(WaveType::Gap);
}
void Parser::inspect_waves(const std::vector<Storage::Tape::ZXSpectrum::WaveType> &waves) {
switch(waves[0]) {
// Gap and Pilot map directly.
case WaveType::Gap: push_symbol(SymbolType::Gap, 1); break;
case WaveType::Pilot: push_symbol(SymbolType::Pilot, 1); break;
// Encountering a sync 2 on its own is unexpected.
case WaveType::Sync2:
push_symbol(SymbolType::Gap, 1);
break;
// A sync 1 should be followed by a sync 2 in order to make a sync.
case WaveType::Sync1:
if(waves.size() < 2) return;
if(waves[1] == WaveType::Sync2) {
push_symbol(SymbolType::Sync, 2);
} else {
push_symbol(SymbolType::Gap, 1);
}
break;
// Both one and zero waves should come in pairs.
case WaveType::One:
case WaveType::Zero:
if(waves.size() < 2) return;
if(waves[1] == waves[0]) {
push_symbol(waves[0] == WaveType::One ? SymbolType::One : SymbolType::Zero, 2);
} else {
push_symbol(SymbolType::Gap, 1);
}
break;
}
}

48
Storage/Tape/Parsers/Spectrum.hpp Normal file
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@ -0,0 +1,48 @@
//
// Spectrum.hpp
// Clock Signal
//
// Created by Thomas Harte on 07/03/2021.
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#ifndef Storage_Tape_Parsers_Spectrum_hpp
#define Storage_Tape_Parsers_Spectrum_hpp
#include "TapeParser.hpp"
namespace Storage {
namespace Tape {
namespace ZXSpectrum {
enum class WaveType {
// All references to 't-states' below are cycles relative to the
// ZX Spectrum's 3.5Mhz processor.
Pilot, // Nominally 2168 t-states.
Sync1, // 667 t-states.
Sync2, // 735 t-states.
Zero, // 855 t-states.
One, // 1710 t-states.
Gap,
};
enum class SymbolType {
Pilot,
Sync,
Zero,
One,
Gap,
};
class Parser: public Storage::Tape::PulseClassificationParser<WaveType, SymbolType> {
private:
void process_pulse(const Storage::Tape::Tape::Pulse &pulse) override;
void inspect_waves(const std::vector<WaveType> &waves) override;
};
}
}
}
#endif /* Spectrum_hpp */