Adding controller.

Adding logging.
Fixing lots of bugs.

CMakeLists.txt

@@ -22,7 +22,7 @@ add_executable(nes
         src/Window.cpp
         src/Window.h
         src/Shifter.cpp
-        src/Shifter.h)
+        src/Shifter.h src/Logger.cpp src/Logger.h src/Controller.cpp src/Controller.h src/SdlKeyboardController.cpp src/SdlKeyboardController.h)
 
 find_package(SDL2 CONFIG REQUIRED)
 find_package(fmt REQUIRED)

main.cpp

@@ -1,5 +1,6 @@
 #include "src/Nes.h"
 #include "src/Window.h"
+#include "src/SdlKeyboardController.h"
 
 #include <functional>
 #include <chrono>
@@ -14,9 +15,10 @@ int main() {
     window.setSize(nes::Ppu::SCREEN_WIDTH * 4, nes::Ppu::SCREEN_HEIGHT * 4);
 
     device.setNewFrameCallback(std::bind(&nes::SdlWindow::drawFrame, &window, _1));
-    //device.insertCartridge("/home/selim/Downloads/nestest.nes");
+    device.connect(std::make_shared<SdlKeyboardController>());
+    device.insertCartridge("/home/selim/Downloads/smb.nes");
     //device.insertCartridge("/Users/selim/Documents/nestest.nes");
-    device.insertCartridge("C:\\Users\\selim\\Documents\\nestest.nes");
+    //device.insertCartridge("C:\\Users\\selim\\Documents\\nestest.nes");
 
     SDL_Event e;
     uint64_t cycles = 0;

src/Bus.cpp

@@ -23,6 +23,9 @@ namespace nes {
         else if(address >= 0x8000) {
             return _cartridge->readPrg(address);
         }
+        else if(address == 0x4016) {
+            return _controller1->read();
+        }
 
         return 0;
     }
@@ -37,6 +40,9 @@ namespace nes {
         else if(address >= 0x8000) {
             std::cout << "Cartridge write at address: " << address << std::endl;
         }
+        else if(address == 0x4016) {
+            _controller1->poll();
+        }
     }
 
     void Bus::connect(std::shared_ptr<Cartridge> cartridge) {
@@ -46,4 +52,19 @@ namespace nes {
     void Bus::connect(std::shared_ptr<Ppu> ppu) {
         _ppu = std::move(ppu);
     }
+
+    void Bus::connect(std::shared_ptr<Controller> controller) {
+        _controller1 = std::move(controller);
+    }
+
+    // For debug
+    // Calc "hash" - just sum of the bytes of first page
+    // Can be useful for detecting change in ram
+    uint32_t Bus::zpHash() const {
+        uint32_t sum = 0;
+        for(size_t i = 0; i < 2048; ++i) {
+            sum += _ram[i];
+        }
+        return sum;
+    }
 }

src/Bus.h

@@ -7,6 +7,7 @@
 
 #include "Cartridge.h"
 #include "Ppu.h"
+#include "Controller.h"
 
 #include <cstdint>
 #include <memory>
@@ -20,11 +21,14 @@ namespace nes {
         void write(uint16_t address, uint8_t value);
         void connect(std::shared_ptr<Cartridge> cartridge);
         void connect(std::shared_ptr<Ppu> ppu);
+        void connect(std::shared_ptr<Controller> controller);
+        [[nodiscard]] uint32_t zpHash() const;
 
     private:
         std::unique_ptr<uint8_t[]> _ram;
         std::shared_ptr<Cartridge> _cartridge;
         std::shared_ptr<Ppu> _ppu;
+        std::shared_ptr<Controller> _controller1;
     };
 
 }

src/Controller.cpp

@@ -0,0 +1,18 @@
+//
+// Created by selim on 9/17/23.
+//
+
+#include "Controller.h"
+
+namespace nes {
+
+    Controller::Controller(): _data{} {
+
+    }
+
+    uint8_t Controller::read() {
+        uint8_t result = (_data & 0x80) > 0;
+        _data <<= 1;
+        return result;
+    }
+}

src/Controller.h

@@ -0,0 +1,36 @@
+//
+// Created by selim on 9/17/23.
+//
+
+#ifndef NES_CONTROLLER_H
+#define NES_CONTROLLER_H
+
+#include <cstdint>
+
+namespace nes {
+
+    class Controller {
+    public:
+        enum Key: uint8_t {
+            A = 7,
+            B = 6,
+            Select = 5,
+            Start = 4,
+            Up = 3,
+            Down = 2,
+            Left = 1,
+            Right = 0
+        };
+
+    public:
+        Controller();
+        uint8_t read();
+        virtual void poll() = 0;
+
+    protected:
+        uint8_t _data;
+    };
+
+}
+
+#endif //NES_CONTROLLER_H

src/Cpu.cpp

@@ -75,7 +75,7 @@ namespace nes {
         _instructions[0xD0] = {"BNE", &Cpu::BNE, &Cpu::REL, 2, false};
         _instructions[0x81] = {"STA", &Cpu::STA, &Cpu::IZX, 6, false};
         _instructions[0x8D] = {"STA", &Cpu::STA, &Cpu::ABS, 4, false};
-        _instructions[0x91] = {"STA", &Cpu::STA, &Cpu::IZY, 5, true};
+        _instructions[0x91] = {"STA", &Cpu::STA, &Cpu::IZY, 6, false};
         _instructions[0x95] = {"STA", &Cpu::STA, &Cpu::ZPX, 4, false};
         _instructions[0x99] = {"STA", &Cpu::STA, &Cpu::ABY, 5, false};
         _instructions[0x9D] = {"STA", &Cpu::STA, &Cpu::ABX, 5, false};
@@ -174,34 +174,36 @@ namespace nes {
         uint16_t hi = _bus->read(0xFFFD);
 
         PC = (hi << 8) | lo;
+
+        _ticks = 8;
     }
 
-    void Cpu::tick() {
+    bool Cpu::tick() {
+        bool executed = false;
+
         if(_ticks == 0) {
             uint8_t opcode = _bus->read(PC++);
             auto instruction = _instructions[opcode];
+            _currentOpcode = opcode;
 
             if(instruction.getAddress == nullptr) {
                 std::cout << "Unknown instruction: " << (int)opcode << std::endl;
-                return;
+                return false;
             }
 
             auto args = (this->*instruction.getAddress)();
             (this->*instruction.process)(args);
 
-//            auto str = std::format("{} ({:02X}), PC: {:X}, SP: {:X}, A: {:02X}, X: {:02X}, Y: {:02X}, [N:{}, V:{}, B{}, D{}, I{}, Z:{}, C:{}]", instruction.name, opcode, PC, SP, A, X, Y,
+            _ticks += instruction.cycles;
-//                (int)getFlag(Negative), (int)getFlag(Overflow), (int)getFlag(Break), (int)getFlag(DecimalMode), (int)getFlag(InterruptDisable), (int)getFlag(Zero), (int)getFlag(Carry));
-//            std::cout << str << std::endl;
-
-            //std::cout << instruction.name << std::hex << ", OpCode: " << (int)opcode << ", PC: " << (int)PC << ", SP: " << (int)SP << ", A: " << (int)A << ", X: " << (int)X << ", Y: " << (int)Y << std::endl;
-
-            _ticks = instruction.cycles;
             if(instruction.variableCycles) {
                 _ticks += args.cycles;
             }
+
+            executed = true;
         }
 
         _ticks--;
+        return executed;
     }
 
     void Cpu::nmi() {
@@ -220,6 +222,21 @@ namespace nes {
         _ticks = 8;
     }
 
+    std::string Cpu::state() const {
+        return std::format("{} ({:02X}), PC: {:X}, SP: {:X}, A: {:02X}, X: {:02X}, Y: {:02X}, [N:{}, V:{}, B{}, D{}, I{}, Z:{}, C:{}], H: {:08X}",
+                           _instructions[_currentOpcode].name,
+                           _currentOpcode,
+                           PC, SP, A, X, Y,
+                           (int)getFlag(Negative),
+                           (int)getFlag(Overflow),
+                           (int)getFlag(Break),
+                           (int)getFlag(DecimalMode),
+                           (int)getFlag(InterruptDisable),
+                           (int)getFlag(Zero),
+                           (int)getFlag(Carry),
+                           _bus->zpHash());
+    }
+
     void Cpu::setFlag(CpuFlags flag, bool value) {
         if(value) {
             flags |= flag;

src/Cpu.h

@@ -42,12 +42,13 @@ namespace nes {
     public:
         Cpu();
         void reset();
-        void tick();
+        bool tick();
         void setFlag(CpuFlags flag, bool value);
         bool getFlag(CpuFlags flag) const;
         void setStartAddress(uint16_t address);
         Bus* bus() const;
         void nmi();
+        std::string state() const;
 
     private:
         size_t _ticks;
@@ -64,6 +65,10 @@ namespace nes {
         uint8_t SP;     // Stack Pointer
         uint8_t flags;
 
+    private:
+        // Debug info
+        uint8_t _currentOpcode;
+
     private:
         void branch(InstructionArgs args);
 

src/Logger.cpp

@@ -0,0 +1,35 @@
+//
+// Created by selim on 9/16/23.
+//
+
+#include "Logger.h"
+
+#include <cstring>
+#include <fstream>
+#include <format>
+
+namespace nes {
+
+    Logger::Logger(size_t size): _size{size}, _offset{0} {
+        _data = std::make_unique<uint8_t[]>(size);
+    }
+
+    void Logger::addLine(uint64_t cycle, std::string_view line) {
+        if((_offset + line.size() + 10) >= _size) {
+            return;
+        }
+
+        std::string cycleString = std::format("[{:06d}] ", cycle);
+        std::memcpy(_data.get() + _offset, cycleString.data(), cycleString.size());
+        _offset += cycleString.size();
+
+        std::memcpy(_data.get() + _offset, line.data(), line.size());
+        _offset += line.size();
+        _data[_offset++] = '\n';
+    }
+
+    void Logger::dump(const fs::path &path) {
+        std::ofstream file(path, std::ios::binary);
+        file.write(reinterpret_cast<char*>(_data.get()), static_cast<std::streamsize>(_offset));
+    }
+}

src/Logger.h

@@ -0,0 +1,30 @@
+//
+// Created by selim on 9/16/23.
+//
+
+#ifndef NES_LOGGER_H
+#define NES_LOGGER_H
+
+#include <cstddef>
+#include <memory>
+#include <filesystem>
+
+namespace nes {
+
+    namespace fs = std::filesystem;
+
+    class Logger {
+    public:
+        explicit Logger(size_t size);
+        void addLine(uint64_t cycle, std::string_view line);
+        void dump(const fs::path& path);
+
+    private:
+        size_t _size;
+        size_t _offset;
+        std::unique_ptr<uint8_t[]> _data;
+    };
+
+}
+
+#endif //NES_LOGGER_H

src/Nes.cpp

@@ -10,7 +10,7 @@
 
 namespace nes {
 
-    Nes::Nes(): _cycles{} {
+    Nes::Nes(): _cycles{}, _logger(100*1024*1024) {
         _cpu = std::make_unique<Cpu>();
         _ppu = std::make_shared<Ppu>();
     }
@@ -23,6 +23,10 @@ namespace nes {
         reset(address);
     }
 
+    void Nes::connect(std::shared_ptr<Controller> controller) {
+        _cpu->bus()->connect(std::move(controller));
+    }
+
     void Nes::reset(std::optional<uint16_t> address) {
         _cpu->reset();
         _ppu->reset();
@@ -36,15 +40,27 @@ namespace nes {
     }
 
     void Nes::tick() {
+
         bool needInterrupt = _ppu->tick();
+//        _logger.addLine(_cycles, _ppu->state());
+
         if(_cycles % 3 == 0) {
-            _cpu->tick();
+            bool instructionExecuted = _cpu->tick();
+//            if(instructionExecuted) {
+//                _logger.addLine(_cycles, _cpu->state());
+//            }
         }
 
         if(needInterrupt) {
             _cpu->nmi();
+//            _logger.addLine(_cycles, "NMI");
+//            _logger.addLine(_cycles, _cpu->state());
         }
 
+//        if(_cycles == 500000) {
+//            _logger.dump("/home/selim/Documents/log.txt");
+//        }
+
         _cycles++;
     }
 

src/Nes.h

@@ -8,6 +8,7 @@
 #include "Cpu.h"
 #include "Cartridge.h"
 #include "Ppu.h"
+#include "Logger.h"
 
 #include <filesystem>
 #include <optional>
@@ -20,6 +21,7 @@ namespace nes {
     public:
         Nes();
         void insertCartridge(const fs::path& path, std::optional<uint16_t> address = std::nullopt);
+        void connect(std::shared_ptr<Controller> controller);
         void reset(std::optional<uint16_t> address = std::nullopt);
         void setNewFrameCallback(std::function<void(const Pixel*)> onNewFrame);
         void tick();
@@ -29,6 +31,7 @@ namespace nes {
         std::unique_ptr<Cpu> _cpu;
         std::shared_ptr<Ppu> _ppu;
         std::shared_ptr<Cartridge> _cartridge;
+        Logger _logger;
     };
 
 }

src/Ppu.cpp

@@ -3,6 +3,7 @@
 //
 
 #include "Ppu.h"
+#include <format>
 
 namespace nes {
 
@@ -80,8 +81,13 @@ namespace nes {
 
     bool Ppu::tick() {
 
+        _needEmitNmi = false;
+
         if(_scanline == 241 && _column == 1) {
             _status.verticalBlank = 1;
+            if(_control.enableNmi) {
+                _needEmitNmi = true;
+            }
         }
 
         // All visible scanlines
@@ -97,8 +103,10 @@ namespace nes {
 
             // Preloading some data ahead of time
             if ((_column >= 2 && _column < 258) || (_column >= 321 && _column < 338)) {
+                if(_mask.renderBackground) {
                     _bgPatternShifter.shift();
                     _bgAttribShifter.shift();
+                }
                 prepareNextBgTile(_column);
             }
 
@@ -125,21 +133,15 @@ namespace nes {
         uint8_t colorIndex = 0;
         uint8_t palette = 0;
 
-        if(_column < SCREEN_WIDTH && _scanline < SCREEN_HEIGHT && _scanline >= 0) {
-
         if(_mask.renderBackground) {
             colorIndex = _bgPatternShifter.getValue(_fineX);
             palette = _bgAttribShifter.getValue(_fineX);
             Pixel pixel = getColor(palette, colorIndex);
 
-                // For debugging
+            _curPalette = palette;
-                if (colorIndex != 0) {
+            _curColorIndex = colorIndex;
-                    pixel = Pixel(0xFF, 0xFF, 0xFF);
-                }
-                else {
-                    pixel = Pixel();
-                }
 
+            if(_column < SCREEN_WIDTH && _scanline < SCREEN_HEIGHT && _scanline >= 0) {
                 setPixel(_scanline, _column, pixel);
             }
         }
@@ -155,7 +157,7 @@ namespace nes {
             }
         }
 
-        return _status.verticalBlank && _control.enableNmi;
+        return _needEmitNmi;
     }
 
     uint8_t Ppu::read(uint16_t address) {
@@ -204,7 +206,7 @@ namespace nes {
                     _tRamAddress.value = (_tRamAddress.value & 0xFF00) | value;
                     _vRamAddress.value = _tRamAddress.value;
                 } else {
-                    _tRamAddress.value = ((value & 0x3F) << 8) | (_tRamAddress.value & 0x00FF);
+                    _tRamAddress.value = (((value & 0x3F) << 8) | (_tRamAddress.value & 0x00FF));
                 }
                 _addressWriteInProgress = !_addressWriteInProgress;
                 break;
@@ -273,9 +275,6 @@ namespace nes {
         else if(address >= 0x2000 && address < 0x3F00) {
             address &= 0x0FFF;
             _nameTable[address & 0x03FF] = value;
-            if (value == 32) {
-                int x = 0;
-            }
         }
         else if(address >= 0x3F00 && address < 0x4000) {
             address &= 0x1F;
@@ -325,7 +324,7 @@ namespace nes {
                 uint16_t address = (_control.patternBackground << 12)
                                    | ((uint16_t)_nextBgTile.id << 4)
                                    | (_vRamAddress.fineY + 8);
-                _nextBgTile.lsb = internalRead(address);
+                _nextBgTile.msb = internalRead(address);
             }
                   break;
             case 7:
@@ -367,17 +366,43 @@ namespace nes {
     }
 
     void Ppu::updateScrollX() {
-        if(_mask.renderBackground && !_mask.renderSprites) {
+        if(_mask.renderBackground || _mask.renderSprites) {
             _vRamAddress.nameTableX = _tRamAddress.nameTableX;
             _vRamAddress.coarseX = _tRamAddress.coarseX;
         }
     }
 
     void Ppu::updateScrollY() {
-        if(_mask.renderBackground && !_mask.renderSprites) {
+        if(_mask.renderBackground || _mask.renderSprites) {
             _vRamAddress.nameTableY =_tRamAddress.nameTableY;
             _vRamAddress.coarseY = _tRamAddress.coarseY;
             _vRamAddress.fineY = _tRamAddress.fineY;
         }
     }
+
+    std::string Ppu::state() const {
+
+        auto palettes = (uint32_t*)_paletteTable.get();
+
+        return std::format("X:{:03d}, Y:{:03d}, V:{:d}, vR: [CX:{:02X}, CY:{:02X}, NX:{:d}, NY:{:d}, FY:{:d}], tR: [CX:{:02X}, CY:{:02X}, NX:{:d}, NY:{:d}, FY:{:d}], FX:{:d}, AL:{:d}, PI:{:02X}, CI:{:02X}, ASL:{:04X}, ASH:{:04X}",
+                           _column,
+                           _scanline,
+                           _status.verticalBlank,
+                           _vRamAddress.coarseX,
+                           _vRamAddress.coarseY,
+                           _vRamAddress.nameTableX,
+                           _vRamAddress.nameTableY,
+                           _vRamAddress.fineY,
+                           _tRamAddress.coarseX,
+                           _tRamAddress.coarseY,
+                           _tRamAddress.nameTableX,
+                           _tRamAddress.nameTableY,
+                           _tRamAddress.fineY,
+                           _fineX,
+                           _addressWriteInProgress,
+                           _curPalette,
+                           _curColorIndex,
+                           _bgAttribShifter._lo,
+                           _bgAttribShifter._hi);
+    }
 }

src/Ppu.h

@@ -80,12 +80,12 @@ namespace nes {
 
         union LoopyRegister {
             struct {
-                uint8_t coarseX : 5;
+                uint16_t coarseX : 5;
-                uint8_t coarseY : 5;
+                uint16_t coarseY : 5;
-                uint8_t nameTableX : 1;
+                uint16_t nameTableX : 1;
-                uint8_t nameTableY : 1;
+                uint16_t nameTableY : 1;
-                uint8_t fineY : 3;
+                uint16_t fineY : 3;
-                uint8_t unused : 1;
+                uint16_t unused : 1;
             };
             uint16_t value;
         };
@@ -105,6 +105,7 @@ namespace nes {
         void setPixel(uint16_t row, uint16_t column, Pixel pixel);
         void connect(std::shared_ptr<Cartridge> cartridge);
         void reset();
+        std::string state() const;
 
     public:
         std::function<void(const Pixel*)> onNewFrame;
@@ -134,6 +135,7 @@ namespace nes {
         TileInfo _nextBgTile;
         Shifter _bgPatternShifter;
         Shifter _bgAttribShifter;
+        bool _needEmitNmi;
 
     private:
         std::unique_ptr<uint8_t[]> _nameTable;
@@ -143,6 +145,10 @@ namespace nes {
     private:
         std::unique_ptr<Pixel[]> _frameBuffer;
         std::shared_ptr<Cartridge> _cartridge;
+
+    private: // For debug
+        uint8_t _curPalette;
+        uint8_t _curColorIndex;
     };
 
 }

src/SdlKeyboardController.cpp

@@ -0,0 +1,19 @@
+//
+// Created by selim on 9/17/23.
+//
+
+#include "SdlKeyboardController.h"
+#include <SDL.h>
+
+void SdlKeyboardController::poll() {
+    auto state = SDL_GetKeyboardState(nullptr);
+    _data = 0;
+    _data |= state[SDL_SCANCODE_Z] << Key::A;
+    _data |= state[SDL_SCANCODE_X] << Key::B;
+    _data |= state[SDL_SCANCODE_TAB] << Key::Select;
+    _data |= state[SDL_SCANCODE_RETURN] << Key::Start;
+    _data |= state[SDL_SCANCODE_UP] << Key::Up;
+    _data |= state[SDL_SCANCODE_DOWN] << Key::Down;
+    _data |= state[SDL_SCANCODE_LEFT] << Key::Left;
+    _data |= state[SDL_SCANCODE_RIGHT] << Key::Right;
+}

src/SdlKeyboardController.h

@@ -0,0 +1,16 @@
+//
+// Created by selim on 9/17/23.
+//
+
+#ifndef NES_SDLKEYBOARDCONTROLLER_H
+#define NES_SDLKEYBOARDCONTROLLER_H
+
+#include "Controller.h"
+
+class SdlKeyboardController: public nes::Controller {
+public:
+    void poll() override;
+};
+
+
+#endif //NES_SDLKEYBOARDCONTROLLER_H

src/Shifter.h

@@ -16,7 +16,7 @@ namespace nes {
         void shift();
         uint16_t getValue(uint8_t offset);
 
-    private:
+    public:
         uint16_t _lo;
         uint16_t _hi;
     };