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Implements some of the memory map, and instantiates audio objects.

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This commit is contained in:
Thomas Harte 2021-03-18 12:14:48 -04:00
parent 404c1f06e6
commit 4a4da90d56
1 changed files with 67 additions and 7 deletions
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74
Machines/Sinclair/ZXSpectrum/ZXSpectrum.cpp
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@ -8,10 +8,20 @@
#include "ZXSpectrum.hpp"
#define LOG_PREFIX "[Spectrum] "
#include "../../MachineTypes.hpp"
#include "../../../Processors/Z80/Z80.hpp"
#include "../../../Components/AudioToggle/AudioToggle.hpp"
#include "../../../Components/AY38910/AY38910.hpp"
#include "../../../Outputs/Log.hpp"
#include "../../../Outputs/Speaker/Implementation/CompoundSource.hpp"
#include "../../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../../../Outputs/Speaker/Implementation/SampleSource.hpp"
#include "../../../Analyser/Static/ZXSpectrum/Target.hpp"
#include <array>
@ -32,7 +42,11 @@ template<Model model> class ConcreteMachine:
public CPU::Z80::BusHandler {
public:
ConcreteMachine(const Analyser::Static::ZXSpectrum::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
z80_(*this)
z80_(*this),
ay_(GI::AY38910::Personality::AY38910, audio_queue_),
audio_toggle_(audio_queue_),
mixer_(ay_, audio_toggle_),
speaker_(mixer_)
{
set_clock_rate(ClockRate);
@ -70,7 +84,50 @@ template<Model model> class ConcreteMachine:
// MARK: - BusHandler
forceinline HalfCycles perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
(void)cycle;
// Ignore all but terminal cycles.
// TODO: I doubt this is correct for timing.
if(!cycle.is_terminal()) return HalfCycles(0);
uint16_t address = cycle.address ? *cycle.address : 0x0000;
using PartialMachineCycle = CPU::Z80::PartialMachineCycle;
switch(cycle.operation) {
default: break;
case PartialMachineCycle::ReadOpcode:
case PartialMachineCycle::Read:
*cycle.value = read_pointers_[address >> 14][address];
break;
case PartialMachineCycle::Write:
write_pointers_[address >> 14][address] = *cycle.value;
break;
case PartialMachineCycle::Output:
if(!(address&1)) {
// TODO: port FE.
}
switch(address) {
default: break;
case 0x1ffd:
port1ffd_ = *cycle.value;
update_memory_map();
break;
case 0x7ffd:
disable_paging_ |= *cycle.value & 0x20;
port7ffd_ = *cycle.value;
update_memory_map();
break;
}
break;
case PartialMachineCycle::Input:
if(!(address&1)) {
// TODO: port FE.
}
break;
}
return HalfCycles(0);
}
@ -91,12 +148,8 @@ template<Model model> class ConcreteMachine:
bool disable_paging_ = false;
void update_memory_map() {
// If paging is permanently disabled, don't react.
if(disable_paging_) {
// Set 48kb-esque memory map.
set_memory(0, rom_.data(), nullptr);
set_memory(1, &ram_[5 * 16384], &ram_[5 * 16384]);
set_memory(2, &ram_[2 * 16384], &ram_[2 * 16384]);
set_memory(3, &ram_[0 * 16384], &ram_[0 * 16384]);
return;
}
@ -153,6 +206,13 @@ template<Model model> class ConcreteMachine:
read_pointers_[bank] = read - bank*16384;
write_pointers_[bank] = (write ? write : scratch_.data()) - bank*16384;
}
// MARK: - Audio.
Concurrency::DeferringAsyncTaskQueue audio_queue_;
GI::AY38910::AY38910<false> ay_;
Audio::Toggle audio_toggle_;
Outputs::Speaker::CompoundSource<GI::AY38910::AY38910<false>, Audio::Toggle> mixer_;
Outputs::Speaker::LowpassSpeaker<Outputs::Speaker::CompoundSource<GI::AY38910::AY38910<false>, Audio::Toggle>> speaker_;
};